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Патент USA US2503738

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April 11, 1950
w. H. HORTON
' 2,503,738
' EXTENSION COLUMN LOCK
Filed Sept. 25, 1947
WILLIAM H. HORTON
8%
INVENF'OR
A TTijRNEYS -
2,503,738
Patented Apr. 11, 1950
i , UNITED STATES PATENT
1- i
2,503,738
EXTENSION COLUMNFIJ‘O'CK
William
Horton, 1Rochester,»N~. 36., ‘assignor =to
Eastman Kodak Company, ‘Rochester, .N. .Y., a
. eorporationof .NewJersey
».‘Applicationjsepteinber 25, 1947',”Sel‘ial No. 773,041
.2" a
may ‘be :readilyiandieasilycreleaseu ito-iepermit'rthe:
members to he slid :in telescopic relation until‘
the :desired position is reached, whereupon the
lock is again ‘operated to ‘clamp the
together.
In the preferred embodiment of the invention,
l .
The ‘present invention relates tojan extensible»
column or supporting ‘member comprising a .pair
of telescoping tubular members, and more par
ticularly to a mechanism for looking or holding
the im'embersin ‘any position of adjustment.
The present invention has, therefore, :-as its
principal object the provisionofalock for effec
tively retaining a pair ‘of-extensible telescoping
tubular vmembers in any ‘position .Of adjustment.
-~1A ‘further objectof the invention is the provi
sioniof a lock of the “class described which will
effectively retain the members in .iadjusted posi
tion, yet may be readily and easily released ‘to
permit the ‘members to be limoved relatively ‘to
the outer "member ‘H is provided, adjacent to
the end 15, with ‘a plurality, #inlth'e ipresentiin
stance three, axially-aligned andequally spaced
peripheral , rectangularlislots ‘or ' openings 1-6 vwhich
extend through the ‘wall ‘of ithe ‘outer member,
as clearly 1 shown in. Fig. 11. .Arcuate shaped-shoes
ll, ‘18 ‘and IQ of the shape shown ‘in Fig‘. l'lpare
positioned in the slots l6 and are s1ight1y1sma‘1i'er
than the latter so that they may be moved'radi
another position of adjustment.
ally therein. Also, the ‘shoes v‘have "a thickness.
Still another object of the invention is ;a lock
which is slightly greater than-the ‘thickness 601"
of thetype vreferred'to which ‘is simple, rugged,
the ‘wall of the ‘member 1 Lime-‘purpose v'of
easy to operate and positive and effective in ‘its
arrangement ' will ‘be later‘ described. vThe ‘curved
action.
To these and other ends, the‘inventiont-resides 20 outer surface 120 “of each shoe "is ‘substantially
concentric rwithi'the outersurface‘? o'f‘th-e outer
in certain improvements and combinations .of
member 'I I, ‘while the inner surface 22 fof‘ea'ch
parts, all as will be hereinafter more/fully ‘de
shoe is substantially riconceniti'ic with the ‘outer
scribed, the novel features being vpointed 'outiin
surface‘ :23 of ‘the inner'member‘ l 2.
the claims at the end of the speci?cation.
»-In-the drawings:
25
.
lFi'g. lis an ‘exploded view ‘of an fexten's‘ible'icoli
umn' and the locking mechanism therefor, {show
ing the relation of the various parts;
~ I
Fig. 2 is a view of the extensible column with
the locking mechanism in position thereon; and
Fig. 3 is a vertical sectional view through the
locking mechanismv and taken substantially in
line 3—3 of Fig. 2, showing the Iarrangementfor
moving the actuating shoe into position to lock
the telescoping members.
-
Similar reference numerals throughout the
various views indicate the same parts.
Ajpair of tubular telescoping cylindrical'mem
bers II and I2 are adapted to cooperate to pro
vide'an extensible column or supporting member,
A retaining [ring 2%! foverlies the shoes ill, 18"
and‘ 1-9 to ‘retain the latter
*the'Tsl'ots illlil‘é‘and
between the ‘inner surface -'2 5 "or the‘r'm'g vand *ith'e -1
outer’ surface 223 of the inner member it’, as
best'shown'in" Fig.‘ 3. The ring-‘2i’? is ‘held-"imposi
tion on “the “outer member =12 *by'm'ean's of "a‘IS'et'
screw "26 ‘which > extends "through "an “opening vv2-‘!
in‘the “ring and‘into contact ‘with’ the surface flil‘l
o‘f'the outer member ‘I lya‘s'is'apparent. Thus,
the’ring 24 not only retainsthe‘shoesin thee-slot
35 l6 ‘but also 'cooperates'with the inner member
I? "to r'etainthe ‘shoes in ‘wedg'ingor'locking rel'aev '
tion with‘ the inn'erm'ember"to‘lo‘ck the’ member's
against relative "movement, as'will’be later de
scribed.
’
‘
The shoes I1 and I8 are preferably‘formed-ioif“
a suitable ' plastic 'mater'ia1 ‘ so ‘as ‘ not ‘to “score - or
the member H being the outer member'an'd'the
scratch‘ the surface "23 "of "the ‘ inner‘mem'bfenthe ‘
member 12 being the 'inner‘member. These mem
disadvantage ‘of which ‘will'benbvious. 'TheJs'hOe
bers may be of any suitable length depending
['9 1 is,‘ however, "preferably :formed ‘of 'metal. "The M
upon the purpose for which they are to be used.
When the members are to be adjusted, the inner 45 ring "24 'is ‘formed ‘with a ‘threaded opening i"2'8_
adapted to receive an adjusting screw ‘'29, the
member is moved or slid a'xially relative to ‘the
end 30 or which is adapted'to engage the outer‘
outer member, as is apparent. However, when
surface 29 of the shoe it as clearly indicated
the parts are adjusted, it is necessary to lock or
in Fig. 3.
retain the members against accidental or inad
In adjusting the length or the column or sup
50
vertent axial movement.
porting member, the members II and 12 are slid
To secure this result, the present invention
axially relative to each other until the desired
provides a novel and simple locking device which
length has been secured. Then the adjusting nut
e?‘ectively holds or locks the members against
29 is screwed in to bring the end 30 into engage
relative movement. However, when the adjust
ment of the members is to be changed, the look 55 ment with the shoe [9 to move the latter radially
2,568,788
4
inwardly and into contact with the outer surface
inner member to lock said members against reiad
23 of the inner member 12. Further movement
of the screw 29 will then serve to shift the inner
member 12 radially a slight distance to bring the
outer surface 23 thereof into engagement with the
ber and overlying said shoes to retain the latter
in said slots, and a threaded member carried by
said ring for engaging and moving one only of
tive movement, a ring carried by said outer mem
inner surfaces 22 of the shoes I1 and I8 to wedge
the latter between the outer surface 23 of the
said shoes into engagement with said inner mem
member I2 and retaining ring 24. When, how
cuate locking shoes loosely positioned in said slots
and having a thickness greater than said outer
ber to shift the latter to wedge the other shoes
‘between said inner member and said ring so that
inner member l2 and the inner surface 25 of the
retaining ring 24. Such wedging serves to clamp
said other shoes will cooperate with said one shoe
or lock the inner member frictionally to the outer 10 to lock the inner member against movement rela
member with su?icient force to prevent inad
tive to the outer member.
vertent or accidentalrelative movement of the
4. In an extensible column, the combination, of
' a pair of thin cylindrical telescoping tubular mem
members. As the adjusting nut 29 is carried by’
the retaining ring 24, the locking action can be
bers, the outer of said members being formed with
broadly considered as being due to the wedging 15 a plurality of axially aligned and peripherally
of the shoes l1, l8, and 19 between the inner ' spaced arcuate slots extending therethrough, ar
ever, the column length is to be changed, the nut
29 is backed off to release ‘the clamping relation ' ' member, a ring carried by said outer member and
of the shoes to free the inner member. The lat 20 engaging the outer surfaces of said shoes to re
ter may then be slid axially in the outer member
tain the latter in said slots, the inner surfaces of
to a new position of adjustment, whereupon the
said shoes being substantially concentric with the
nut 29 is again screwed in to bring the shoes into
outer surface of said inner member, and a radially
clamping relation with the inner member to lock
movable screw carried by said ring for moving one
the members effectively against relative axial
of said shoes only radially into contact with said
movement.
inner member to cause all of said shoes to wedge
While one embodiment of the invention has
between said inner member and said ring to lock
been, disclosed, it is to be understood that the
said inner member to said outer member.
inventive idea may be carried out in a number
5. In an extensible column, the combination, of
a pair of thin cylindrical telescoping tubular
of Ways. This application is, therefore, not to
be limited to the precise details disclosed, but
members, the outer of said members being formed.
with a plurality of axially aligned and peripher
is intended to cover all variations and modi?ca
tions thereof falling within the scope of the ap
ally spaced arcuate openings extending there
pended claims.
I claim:
1. In an extensible column, the combination of
a pair of thin telescoping tubular members, the
outer of said members being formed with a plu
through, arcuate locking shoes loosely positioned,
35 in said openings and having a thickness greater
than said outer member, a ring carried by said
outer member and engaging the outer surfaces
of said shoes to retain the latter in said openings,
rality of axially aligned and peripheral spaced I
the inner surfaces of said shoes being substanti-,
slots, locking shoes positioned loosely in said slots ' 40 ally concentric with the outer surface of said
and adapted to engage the inner of said members
inner member, a radially movable threaded mem
to lock said members against relative movement,
bercarried by said ring for moving only one of
means for retaining said shoes in position in said
said shoes radially into contact with said inner ',
slots, and a screw carried by said outer member
member to cause all of said shoes to wedge be
for engaging one of said shoes only to move the 45 tween said inner member and said ring to lock
latter into engagement with said inner member to
said members, and means for retaining said ring
shift the latter into locking relation with said
imposition on said outer member to overlie said
shoes.
shoes.
’
2. In an extensible column, the combination, of
‘
WILLIAM H. HORTON.‘
a pair of thin telescoping tubular members, the 50
outer of said members being formed with a plu
REFERENCES CITED
rality of arcuate slots, locking shoes positioned
The following references are of record in the
loosely in said slots and adapted to engage the
inner of said members to lock said members
?le of this patent:
against relative movement, a ring carried by said ’
outer member to retain said shoes in position in ‘
said slots, and a threaded member carried by said
ring for moving one of said shoes only toward.
said inner member to lock the latter against all‘
of said shoes.
3. In an extensible column, the combination, of
a pair of telescoping tubular members, the outer‘
of said members being formed with a plurality
of axially aligned and peripheral spaced arcuate
slots, arcuate locking shoes positioned loosely in
said slots and having a thickness greater than
said outer member and adapted to engage the
_
Number
836,376
1,295,412
1,394,596
(H)
. ,
UNITED STATES PATENTS
Name
Date
Fancher _________ __ Nov. 20, 1906
Baines ___________ __ Feb. 25, 1919
Wohl et al ________ __ Oct. 25, 1921
1,744,521
Briese et a1 ________ __ Jan. 21, 1930 ,
2,038,806
2,189,644
Sellar ____________ __ Apr. 28, 1936
Wingard __________ __ Feb. 6, 1940
Number
‘ 251,868
FOREIGN PATENTS
Country
Date
Germany _________ __ Oct. 10, 1912
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