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Патент USA US2510593

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I
June 6, 1950
2,510,593
M. J. MECHLING
MINE TIMBER
'
2 Sheets-Sheet 1
Filed Oct. 25, 1946
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6
INVEN TOR.
Mo/vzoe J.‘ Mac/l4 we
H6. .5
June 6, 1950
,
M. J. MECHLING
2,510,593
vMINE TIMBER
Filed Oct. 25, 14946
K
\XTTW'TYY \
2 Sheets-Sheet 2
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NVTUVTOR.
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F76. 1/
Ma/vkaa J/Vscamvc;
BY
14M, W17,
'
3%
2,510,593
Patented June 6, 1950
UNITED STAT ES PATENT OFFICE
'
2,510,593
MINE TIMBER;
Mcnroe Livreeming, Greensburg, Pal
Application October .25, 1946, Serial No. 705,605
15 Ciaiiiisl. (Cl; 61-45)
1
Fig. 6v is yet another modi?cation;
This invention relates: to. mine‘ timbers and,
Fig. 7 is an enlarged rerspective' view of a
more particularly, to prefabricated mine timbers
for supporting the roofs of underground- entries,
passageways. excavations. or tunnels hereinafter
referred to as shafts.-
portidnof the timber shown in Fig. 6;v
_
V
Fig. .8' is an enlarged ‘side view of a portion of
the timber shown in Fig. 6;
’
*
Fig. 9 is an enlarged perspective view of a por
The object of. this invention is the provision
of a new and improved. mine timber which is
tion of a modi?ed mine‘ timber‘;
simple in structure, (physically strong, easily and
simply installed, and adjustable both. in width
in Fig. ,9} and‘
'
‘
Fig‘. 10 is a side' view of the modification shown
t
Fig. 11 is a fragmentary view of a section of
and height for adaptation to a maximum. number 10
a mine shaft having mounted therein another
of variable conditions.
modi?cation of a, mine. timber embodying the
Another object of this invention isthe pro
present vention.
"
vision of a new and novel mine timber for sup
Gener ,l'y speaking, the invention comprises a
porting the roofs of underground shafts/which
utilizes the lateral stability of the walls vof the 15 roof or" other overhead structure support which
bears at its ends in opposing walls‘is fully ad‘
shaft for supporting the roof and‘ maintains
iustable, and tends. .tjqlensthen. when‘ the; weight
the ?oor of the shaft free from the usual roof
supporting obstructions;
' Another object is the provision .of .a- new and
novel- mine timber for supporting the roofs of
20
underground shafts which has articulatedmen'i
bers for supporting the roof, the membershavifng
to be‘ supported 18 applied thereto’, utilizing“ the
lateral stability of theiwalls for giving increased
security of Support While the invention is
described with particular reference to the; Sun
nornns?of the roofs ofundergroimd she . rich
relatively large interengaging load transferring
as mine shafts, it will ‘be appreciated that the
A further object isthe provision of a new and
with a minimum of weight and’ materialsjin' the
invention is‘ also applicable to" other ‘uses wherein
surfaces whereby the danger of failure of the
articulated joint is lessened.
25 a‘ maximum of supporting strength is ‘required
supporting elements.
improved mine timber of the type referred to
having adjusting. .means for facilitating Dosi
tioning of vthe timber for obtaining an initial
supporting action.
>
30
.
Still another object, isv the provisionof‘ anew
and novel supporting means for .the roofs of
underground shafts which ,is. self-adjusting for
shafts of different ,widths.
'
‘Referring to the drawings where a rnuinbe‘r'ofi
embodiments’ of the‘ invention are shown. Figs.
1, 4,5; 6, and 11 show‘ cross-sectional views of
amine shaft A- havingvertical- side {walls-‘t0; l I, a
floor 12*, anda- r'oof l-3-"to besupported, each with
a" different roof support or mine "timber B-posff
tioned ‘therein in supporting;relations-hip with
Still another object of this invention is the 35. the roof I31‘;
provision of- a newand improved load transferring
Intlie embodiments shown, the
mine» timber B comprises a horizontal‘ roof sup‘;
porting‘ member or vbeam 16 positioned trans
ver‘s‘ely oflth'e'éshait and substantialv parallel
relationship with-the roof t3» and relatively short
joint for articulated members comprising‘ means
for maintaining the members in assembled rela
tionship, and mating surfaces for transferring
the load from one member to the?otherlinde 40 beam supporting members 48;. .l?9",.each" articulated
atone end to? an endzofr the .beam I6»and'.~ex.-:
pendently of‘ the means for, maintaining .the
members assembled.
The invention resides in certain ‘constructions
and combinations and arrangements vofparts,v and
‘further objects and advantages will be apparent
to thoseskilledin the art to whichit relates from
the ‘following description» of the preferred em!
bodiment described ‘with reference vto the ac.
tending outwardly anddown'wardly on an angle
into arti?cially‘ made niches 21,22 inthe walls
companying drawings forming a _.part of this
i0, :11‘ respectively where the entire weightwof
the‘ roof is ‘borne;
For-:Itransferring the weight .of the roofst'ruc—
ture h3~to the. mine‘ timber B,-;a»wejoden~_bear;n
23 is preferably positioned between the trans,
versecbeam l6; and the roof J13; providingrga wide
speci?cation, and’ in which:
bearing area for the material .of vthe roof and _>
’
Fig. 1 shows a cross-sectionalview of amine
shaft having installed therein a 'mine timber
embodying the presentinvention;
2‘3 to‘gthetransversegbeam
Fig. 2 is an enlarged perspective-view of a'por
tion of the timber;
'
-
Fig. .3 is »an- enlargedside »vi'e.w vof~a .portionpf
the timber;
Fig. 4- is a view similar tov Fig. 1 shQW'ing-a
modi?cation;
7
a; suitable nonefrangible material: against which
means for transferring‘- th ..
rgFigas shows another modification;
;
7
:
.
-
‘
embodiment shown-,- these .meansymay
55 a-‘jack shaft 'Zklihmadaibly ?ngag'cdii. 1'1
verse beam :lfv atwitso-midpoint, an;
_,
V
vertically ‘upward-1y where it: engage xrthe-zbeam
'23 throughya» bearing plate- .25 suitably mounted
on. thewnpper endiof the jack- ;shaft 2d: 'uch
60 that the plates? remains stationary while the
2,510,593
4
3
jack shaft 24 is screwed into supporting en
gagement with the beam 23. As shown, a pair
of blocks 3|, 32 which may be slightly wedge
shaped for facilitating insertion may be posi
tioned intermediate the ends of the supporting
member l6 and the ends of the beam 23 for
supporting the ends of the beam 23 and re
lieving some of the weight on the jack shaft
at the center of the beam [6.
These blocks
end of the roof supporting member l6 against
which the surfaces of the articulated ends of
the depending members l8, I9 respectively may
engage, and the diameter of the hole 35 in which
the pin 34 is journaled is made sufficiently
greater than the diameter of the pin 34 such
that the ends of the depending members l8, [9
may engage their respective surfaces when a
load is placed on the roof supporting member
may be driven into place after the mine timber 10 I6. It is preferable that the angle between the
depending members l8, l9 and the roof sup
is otherwise installed and the jack shaft 24 '
porting member l6 be fully variable so as to
operated so as to transfer the weight on the
beam 23 to the supporting member l6 and thence
compensate for different shaft widths and in
through the supporting members l8, l9 to the
sure that the surfaces always transmit at least
Walls H], II.
"
In the timber shown, articulation of the mem
bers l8, l9 relative to the transverse beam is
15 the major proportion of the load.
Accordingly,
these surfaces are made curved and preferably
arcuate with a center of curvature approximately‘
coincident with the axis of the pin 34 whereby
the members l8, [9 may be articulated through
cilitates installation of the same sized timber 20 a maximum swing with the surfaces still bearing
the major proportion of the load. Alternatively,
in mine shafts of di?erent widths. Variations
a ball and socket joint could be provided, al
in the over-all vertical height of the timber
though possibly with a slight sacri?ce of the
caused by articulation of the members l8, H5
lateral stability from that obtainable with the
in compensating for the different widths of the
mine shaft may be compensated for by suitable 25 structure shown.
adjustment of the jack shaft 24. In addition,
The articulated joint described facilitates
manual articulation of the members while the
adjustment of the jack shaft 24 provides a com
pensating means for differences in the height
timber is being installed and enables further
articulation even when the timber is under rela
of the niches 2i, 22 from the level of the roof
tively heavy loads. Any weight bearing on the
l3 or for different thicknesses of supporting
members tends to effect a longitudinal lengthen
beams 23 or blocks 3|, 32, or both.
ing of the timber, which lengthening is resisted
As shown, the outer or lower ends of the mem
by the body of the material forming the wall and
bers l8, 19 may have their upper or outer sur
e?ects a lengthening or shortening of the over
all longitudinal length of the timber B and fa
its lateral stability whereby the lateral stability
faces cut on a longitudinally diagonal plane
providing a sharp edge on that end of the mem 35 of the wall contributes materially to supporting
ber for engaging in the niches 21, 22 and trans
ferring the weight of the roof on the timber B
to the walls H], H. It will be appreciated that
this weight can become quite large and impose
the timber in position and the roof in place.
members, and ‘particularly on the articulated
joint between the members l8, l3 and the trans
supporting members l8, 19 deep into the walls 10,
With the structure shown, the Vertical compo
nent of the weight of the roof on the timber is
directed by virtue of the articulated joint in an
a considerable supporting burden on all the 40 angular direction coincident with the axis of the
l l. Any crushing or failure of the walls adjacent
the point of insertion of the lower and outermost
ends of the members I8, [9 merely serves to
providing surfaces other than those retaining
the members in articulated relationship for bear 45 make the wall denser at this point and increases
its ability to resist the forces on the timber and
ing this load between the members. In the em
thus to support the roof l3. While the members
bodiment of the invention shown, the members
l8, l9 may have any relative angle to the hori
I8, 19- are held in articulated assembled rela
zontal, it is preferred ‘for best results to take
tionship with the transverse beam [6 by means
advantage of the lateral stability of the walls I0,
of a transverse horizontal pin 34 ?xedly mounted
I! that this angle be somewhere between 30 to
in each end of the supporting beam I6 and jour
verse beam l6.
This invention contemplates
nalled in suitable holes 35 in the upper or inner
60°, although it may be more or less.
The members l6, l8, l9 may be formed in any
end of the supporting members. The pin 34
suitable manner to give the maximum amount of
must of necessity have a diameter somewhat less
than the width of the member in which it is 55 strength for a minimum weight of timber. Thus,
in the embodiment shown in Fig. 1, the roof sup
mounted or journaled and is not capable of
porting member 16 is an I-beam having top and
transferring a large amount of weight from the
bottom horizontal ?anges 40, 4| joined by an in
roof supporting member [5 to the depending
termediate spacing web 42, while the depending
members l8, l9 due to the relatively small cross 60 members l8, [9 may be formed from an H-beam
sectional areas which can be brought into en
having vertical ?anges 44, 45 and an intermedi
gagement to transfer this load, the stress here
ate transverse web 46. Whensuch structural
involved being directly proportional to the load
shapes are utilized to form the members, the web
and inversely proportional to the diameter of I
42 may extend beyond the flanges 40, 4| at each
the pin 34. If the load becomes great enough, 65 end of the member l6 and provide a central
the possibility arises that either the pin 34 may
mounting support for the pin 34. The surfaces
shear off or the member in which it is journaled
38 may be provided by welding or otherwise
or mounted fail and give way. Accordingly, in
securing suitable shaped pieces of metal or other
the embodiment of the invention shown it is
material intermediate the ?anges 40, 4! and'on
preferred that the pin 34 only retain the mem~
both sides of the web 42. Similarly, other mate
bers in articulated relationship and that other
rial may be welded between these flanges and on
surfaces of a much larger area be provided for
either side of the web adjacent the middle of
bearing or transferring the load from the sup
the member IE to provide a suitable threaded
porting member Hi to the depending members
support forthe jack shaft 24 and, if necessary,
I8, l9. Surfaces 38, 39 are provided at each 75 to provide increased strength at this point. vIn
2,510,599»
rrom . the lower. surface of. the. ?ange (i4- om each.
side or the web. 65.‘ and. so positioned‘. that when
thepin34 is. in any oneof the slots. 6i. tl'resur-v
faces of the abutments will. engage the rounded
this embodiment of the. invention the. beam i5.
is relatively long- and- the: cl'encudingv members I 8‘;
l-9!re1atively short andsuppoitted in. niches 2'7, 22,.
high on the. wall so. thatthetimber obstructs a
minimum area. of the shaft.
In the embodiment of the invention shown. in
Fig. 4. the roof supporting; member 16 rela
tively short compared to the transverse width 0f.
the'shaft A while thedepending members 18;. i9‘
are relatively long. and engage the. walls, at. points
further spaced from the. roof than. the. embodi
v edges. of. the . ?anges. 1i), 1 I, thus.‘ transmitting. the
load on the beam it to. the. depending. members.
[8,- [31 Adjustmentmay be effectedby disengag
ing the pin 3.4 from, any notch?'l'andjslidingit in.
thelongitudinalopenings 6.6. to any other notch
10 desired, a, different. abutment 13 being provided.
for each notch. In this embodiment. of the. in’
vention, the jackshait 24' is providedpn. its upper
ment shown in. Fig. 1. The. member. t5.
be.
formed from a block. of. solid? material suitably
cut away at the ends to- leave central. vertical
webs 5n, 5! in which the pin 34 may be mounted,
while the-depending; members may be formed.
from an I-beam. Spaced.v vertical. ?anges 52, 53-.
having the enlarged openings 35 for receiving. the
pin 34 and rounded on their‘ends for engage.
endw-ith aconical-suriace for engagingthesup
porting beam 231 and providing. asecond adjust.
ment.
'
.
Fig. 9 showsanother. modi?cationof theinven
tion whereinthe member. I6. isinstheform. of an‘
inverted‘ U-shaped channel having a base 151’and.
depending ?anges or webs 16,. 1.1. Each. flange.
has.a.longitudi_nally extending opening 18' adja
ment against the arcuate surfaces on the beam.
I6 are ?xed to one end of the I-beamsand form '
cent. the. lower edge. similar to. the opening 6.6}. in.
the web¢65 and with a. plurality of longitudinally.
the articulating. means for the members. [8, l9.
spaced upwardlyv extendingslots 1:9. The. mem-.
Stops 54, 55 may be provided on theupper sur
ber [.67. has suitable; longitudinally spaced trans-‘
face of each depending member l8, l9. having a
substantially horizontal surface upon. which 25 versely extending abutments between the ?anges.
16, 1.1: so. positioned: that. when the pin.“ is.po
blocks, in this instance vertically elongated, may.
sitioned in any» pair- of. slots, the rounded end of
rest-in supporting relationshipbetween the mem
the member I8. may engage the. adjacent abut
bersyl?, l9 and the beam 23.
ment, the widthand depth oi theslots 19, being
Fig. 5- shows another modi?cation of the in
such. that engagement. will occur before the. pin
vention wherein the beam l6’ has been entirely
34 engages. the sides thereof. Thus. in. the. em.
eliminated and the depending members I8, l9
bodiments shown inFi-gs. 6.. to 9,.the. mine, tim
are articulated relative to each other toviorm the
bers may :beplaced. imposition. andi apoint of
mine timber. In this embodiment of. the inven
articulation. chosen for the. depending members.
tion, the articulated‘ end of- the member [9 has a
[8, L9 relative, to the supporting, member l?f such
central web for mounting the pin 35 and the
as will facilitate installation. of the. timber and
articulated end of the member l-lhas-spaced ver
provide. full and safe support for.‘ the roof‘ of the
tical plates or ?anges with the openings 35,
formed therein for loosely- iournaling the'pin 34.
Abutting arcuate- surfaces having a center of
curvature substantially aligned with the. pin. 34
for bearing the forces involved independently oi.
the pin 34 are provided as shown in‘ the?gure.
The members l8, l9 have radial transverse-abun
ments; 69. 6| on their- upper suriacewhich limit.
the articulating movement of themembers !8,. I19.
in a downward direction, In a similar manner to
the embodiment showninFig. 4,.the- embodiment
shown in. Fig. 5. has suitable stops midway of. the
length of the members for receiving the support
ing blocks 3.! , 3.2, which in this embodiment. trans
fer all the weight of the roof l3. on thebeam 23
to the mine timber.
In the embodiment. of. the. invention shown. in
Fig. 6, the point of articulation of the roof sup.
porting, member 16" and the depending members
shaft.
453
'
In theembodiment of the. invention shown in,
Fig. 11“, the. dependingmembers l8, [Hare made
adiustable in length and as shown comprise a
.base. 80' pointedon its lower end‘. for engagement
in a niche of thewall I'll‘. a threadedljshaft 83"hav
ing on its upper end a member 84 for articulation
with the supporting member [6, and‘ a collar. on
the base 80 threadably engaged. with the shaft
83, rotation of which either extends or retracts.
the, shaft 83 and‘adjusts the length of the mem
ber [8.
To install. the‘ mine timber shown in the ?g
ures. the. niches. 2|.‘ 22. are‘ first cut in the' walls,
l0.» II at a suitable height above the. floor 12,,
which height‘ is; not critical. The minev timber
is‘ then hoisted substantially: into position with
the. jack. shaft 24. screwed down. as far as'it will
[8‘, I9‘ is. adjustable longitudinally of. the beam -- ' go,_ and the lower ends. of the members l8... ['9 ‘are
l6. As shown,.the member I6 is av T-beam. with
an upper horizontal‘ ?ange. tillv and a depending
positionedin the niches 2|, 22.
The beam 2'3‘ is
positioned above the timber and in substantially
parallel relationship with the supporting mem
vertical‘?ange or Web 65 having. therein. adjacent
its lower edge a longitudinally extending opening 60 ber IS. 'The‘ supporting member I6: is; ‘then
moved longitudinally so as to position it‘ as closely
'66 with aplurality of notches 61‘ extending angu
asipossible to the" transverse center of the shaft
l'arly upwardly therefrom so as to be inclined‘
A‘; and the jack shaft 24 is, screwed upwardly
toward‘ the center line of the member. The. de
until" it forces the beam’ 23 into ?rm‘ engagement
pending members 18‘, f9 are of‘ H-beam construc~
tion having verticalv flanges‘ 10‘, TI and ahori 65 with the roof 13 of the shaft A, at which time
the mine timber is properly in position. When
zontal web 12; therebetween, the web‘ 12 being
so installed the friction between the plate 25 and
cut away at the articulated end to provide‘ clear
the beam 23 prevents further longitudinal move
ance for the web 65-. In. this embodiment the
ment of the supporting member I6: and holds’ the
pin 34v is ?xedly mounted adjacent the articu
lated ends of the members l8, 1-9 in the flanges 70 mine; timber. securely in position. rllhe blocks
3 I‘, 32' may then be installed. Any~weight exerted
10‘,_1I-, the ends of- which are rounded having a
on the supporting member IB- as a result ofv the
center of curvature approximately aligned with
roof 13-1 of‘the shaft A sagging will be trans-mit
the axis of thepin 34. The roof supporting mem
ted to the depending members‘ it, I9l through a
ber I6 has a plurality‘ of longitudinally spaced
transversely extending abutments- 131 depending 76 surface of substantial bearingv area andthonce
aims‘
8
to the relatively ?rm and substantial side walls
place therein, and complementary surfaces on
l0, II at an angle such that a substantial com
each of said members adjacent their pivotal con
nections adapted to interengage when the load
of the roof of the shaft is applied to said ?rst
ponent of the weight attempts to push the side
walls H], II (laterally. This lateral component,
which may be otherwise described as a tendency
for the timber to lengthen longitudinally, is re
sisted by the lateral stability of the side walls
whereby the timber may take advantage of this
stability for producing a support which is struc
turally capable of preventing the disastrous cave
ins so common in mine shafts.
Thus it will be seen that the invention de
mentioned member and effect transmission of
that load to said pair of members thereby sub
stantially relieving the pivotal connections of
said load.
4. A mine timber as de?ned in claim 3 and in
which the said complementary surfaces are arou
ate whereby variations in the angularity between
said members does not interfere with the inter
scribed accomplishes the objects thereof and pro
engagement of said surfaces for the transmis
vides a mine timber which is simply installed,
sion of load therethrough.
adjustable to mine shafts of different widths, 15
5. A mine timber as de?ned in claim 3 and fur
and which tends to lengthen as a result of bear
ther comprising means carried by said ?rst-men
ing a weight whereby the lateral stability of the
tioned member and vertically adjustable relative
walls of the mine shaft may be utilized for aid
thereto to effect engagement with the roof of the
ing in the support of the roof.
shaft in which the timber is positioned and to
It will be appreciated that modi?cations and
transmit at least a part of the load of the latter
alterations differing materially in appearance
to said timber.
and structure will occur to others skilled in the
6. A mine timber as de?ned in claim 3 and fur
art upon a reading and understanding of this
ther comprising a jack screw cooperating with a
speci?cation, and it is my intention to cover all
threaded opening in the ?rst-mentioned member
such modi?cations and alterations insofar as 25 intermediate the ends of the latter, the said jack
they are within the scope of the appended claims.
screw having its axis substantially vertical when
the timber is in place in ‘a mine shaft and being
Having thus described my invention, I claim:
1. A mine timber adapted to be positioned in
adjustable relative to-the ?rst-mentioned mem
ber to effect engagement with the roof of the
a mine shaft to transmit the load of the roof to
shaft and transmit at least a part of the load of
the side walls thereof, the said timber compris
the latter to said timber.
ing a plurality of elongated members loosely
'7. A mine timber as de?ned in claim 3 and in
_ pivotally connected together with the free ends
which at least one of said pair of members in
of said timber being adapted to be received in
cludes means for adjusting the length thereof.
niches in opposite side walls of the shaft, the
8. A mine timber as de?ned in claim 3 and fur
over-all length of said timber being greater than 35
ther comprising means for varying the lengths
the width of the shaft so that the members of
of said pair of members.
said timber Whose ends are received in said
9. A mine timber adapted to be positioned in a
niches extend angularly inwardly and upwardly
mine shaft to transmit the load of the roof to
with respect to the side walls of the shaft when
the timber is in place therein, the pivotal con 40 the side walls thereof, the said timber comprising
a ?rst member adapted to extend substantially
nection of adjacent members including a pivot
parallel ‘with the roof of said shaft, a pair of
pin mounted in one of the members and received
spaced members the lower ends of which are
in an enlarged opening in the other of the mem
adapted to be received in niches formed in the
bers, and complementary surfaces on each of
said members adjacent the pivotal connection 45 opposite side walls of the shaft, means loosely
pivotally connecting the other ends of said pair
therebetween adapted to interengage when the
of members to said ?rst-mentioned member ad
load of the roof of said shaft is applied to said
timber, the said interengagement occurring be
jacent opposite ends of the latter, the combined
length of said members being greater thanvthe
operating enlarged opening so that the said load 50 width of the shaft and the distance between the
pivotal connections being less than the width of
is transmitted to the side walls of the shaft
the shaft so that the said pair of members extend
through the said complementary surfaces with
angularly inwardly and upwardly with respect to
substantially none of the load being transmitted
the side walls of the shaft when the timber is in
through the pivot pin.
2. A mine timber as de?ned in claim 1 and in 55 place therein, and complementary surfaces on
fore the pivot pin engages the side wall of the co
which the said complementary surfaces are arcu
each of said members adjacent their pivotal con
nections adapted to interengage when the load of
ate whereby variations in the angularity between
the roof of the shaft is applied to said ?rst-men
said members does not interfere with the inter
tioned member and to effect transmission of that
engagement of said surfaces for the transmission
of load therethrough.
60 load to said pair of members thereby substantially
relieving the pivotal connections of said load.
3. A mine timber adapted to be positioned in
10. A mine timber adapted to be positioned in
a mine shaft to transmit the load of the roof
a mine shaft to transmit the load of the roof to
to the side walls thereof, the said timber com
prising a ?rst member adapted to extend sub
the side walls thereof, the said timber comprising
stantially parallel with the roof of said shaft,,a 65 a ?rst member adapted to extend substantially
pair of spaced members the lower ends of which
parallel with the roof of said shaft, a pair of
are adapted to be respectively received in niches
spaced members the lower ends of which are
formed in the opposite side walls of the shaft,
adapted to be received in niches formed in the
means loosely pivotally connecting the other
opposite side walls of the shaft, means loosely
ends of said pair of members to said ?rst-men
pivotally connecting the other ends of said pair
tioned member adjacent opposite ends of the
of members to said ?rst-mentioned member ad
latter, the said pivotal connections being so lo
jacent opposite ends of the latter, the said means
cated that the said pair of members extend angu
each including a pivot pin mounted in one of said
larly inwardly and ‘upwardly with respect to the
members and received in an enlarged opening in
side walls of the shaft when the timber is in 75 the adjacent member, the said pivotal connec
2,510,593
tions being so located that the said pair of mem
bers extend angularly upwardly and inwardly
with respect to the side walls of the shaft when
the timber is in place therein, and complementary
surfaces on each of said members adjacent their
pivotal connections adapted to interengage when
to the side walls thereof, the said timber com
prising a ?rst member adapted to extend sub
stantially parallel with the roof of said shaft, the
said member having a pair of spaced elongated
longitudinally extending openings therein with
each opening having spaced recesses extending
obliquely therefrom, a pair of spaced members
the load of the roof of said shaft is'applied to
the lower ends of which are adapted to be re
the ?rst-mentioned member, the said interen
spectively received in niches formed in the op
gagement occurring before the corresponding
pivot pin engages the side wall of the cooperating 10 posite walls of the shaft, a separate pivot pin
carried by the other end of each of said pair
enlarged opening so that the said load is trans
of members with each pivot pin received in one
mitted from the ?rst-mentioned member through
of the slots of said ?rst-mentioned member and
the complementary surfaces and the said pair of
adapted to selectively enter the said recesses so
members to the side walls of the shaft and sub
stantially none of the load is transmitted through 15 that the said pair of members extend angularly
inwardly and upwardly with respect to the side
the said pivot pins.
walls of the shaft when the timber is in place
11. A mine timber adapted to be positioned in
therein, the ?rst-mentioned member having sur
a mine shaft to transmit the load of the roof to
faces adjacent each of said recesses which are
the side walls thereof, the said timber comprising
a ?rst member adapted to extend substantially 20 complementary with surfaces provided on the
said other ends of said pair of members, the said
parallel with the roof of said shaft, a pair of
complementary surfaces being adapted to inter
spaced members the lower ends of which are
engage before the said pivot pins have contacted
adapted to be received in niches formed in the
the ends of said recesses whereby the load of
opposite side walls of the shaft, means loosely
pivotally connecting the other ends of said pair 25 the roof of said shaft is transmitted through said
complementary surfaces and said pair of mem
of members to said ?rst-mentioned member ad
bers to the side walls of said shaft.
jacent opposite ends of the latter, the combined
14. A mine timber adapted to be positioned in
lengths of said members being greater than the
a mine shaft to transmit the load of the roof to
width of the shaft and the distance between the
pivotal connections being less than the width of 30 the side walls thereof, the said timber compris
ing a pair of members loosely pivotally con
the shaft so that the said pair of members extend
nected together with the free ends of said tim
angularly upwardly and inwardly with respect to
ber being adapted to be received in niches in
the side walls of the shaft when the timber is in
the opposite side walls of the shaft, the over-all
place therein, the said means each including a
pivot pin mounted in one of said members and 35 length of said timber being greater than the
width of the shaft so that the said members
received in an enlarged opening in the adjacent
extend angularly inwardly and upwardly with
member, and complementary surfaces on each of
respect to the side walls of the" shaft when the
said members adjacent their pivotal connections
timber is in place therein, the pivotal connection
adapted to interengage when the load of the roof
of said shaft is applied to the ?rst-mentioned 40 of said members including a pivot pin mounted
member, the said interengagement occurring be
in one of the members and received in an en
larged opening in the other of the members, and
fore the corresponding pivot pin engages the side
wall of the cooperating enlarged opening so that ' complementary surfaces on said members adja
cent their pivotal connection adapted to inter
the said load is transmitted from the ?rst-men
tioned member through the complementary sur 45 engage when the load of the roof of said shaft
is applied to said timber, the said interengage
faces and the said pair of members to the side
walls of the shaft and substantially none of the
ment occurring before the pivot pin engages the
load is transmitted through the said pivot pins.
side wall of the enlarged opening so that the
12. A mine timber adapted to be positioned
said load is transmitted to the side walls of the
in a mine shaft to transmit the load of the roof 50 shaft through the said complementary surfaces
to the side walls thereof, the said timber com
with substantially none of the load being trans
prising a first member adapted to extend sub
mitted through the pivot pin.
stantially parallel with the roof of said shaft, a
15. A mine timber as de?ned in claim 14 and
pair of spaced members the lower ends of which
further comprising means on each of said mem
are adapted to be respectively received in niches 55 bers adapted to provide a seat for the lower end
formed in the opposite side walls of the shaft,
of a thrust member interposed between a member
means loosely pivotally connecting the other ends
of the timber and the roof of said shaft.
MONROE J. MECHLING.
of said pair of members to said ?rst-mentioned
member adjacent opposite ends of the latter,
REFERENCES CITED
means to adjust the over-all length of said tim 00
ber, the said pivotal connections being so located
The following references are of record in the‘
and the length of said timber being so adjusted
?le of this patent:
that the said pair of members extend‘ angularly
inwardly and upwardly with respect to the side
walls of the shaft when the timber is in place
therein, and complementary surfaces on each
of said members adjacent their pivotal connec
tions adapted to interengage when the load of
the roof of the shaft is applied to said ?rst
mentioned member and effect transmission of 70
that load to said pair of members thereby sub
stantially relieving the pivotal connections of
said load.
7
>
13. A mine timber adapted to be positioned in
a mine shaft to transmit the load of the roof 75
Number
UNITED STATES PATENTS
Name
Date
1,226,444
2,121,291
2,210,788
Number
Barber ___________ __ May 15, 1917
Habe ____________ __ June 21, 1938
Anderson _________ __ Aug. 6, 1940
FOREIGN PATENTS
Country
Date
3,920
Great Britain ____________ __ 1914
513,356
Germany _________________ _. 1930
385,749
Great Britain ___________ _~__ 1933
1701,893
Germany _, ______________ __ 1941
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