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Патент USA US2382525

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Aug.- 14, 1945.
Filed Nov. 1, 19471
~ ,2 Sheets-Sheet l
17~ ~
Patented Aug. 14, 1945
_ 2,382,525
Fred ‘G. Wellington, vSeattle, Wash., assign-onto
Paul Wickstrom, Seattle, ‘Wash.
- Application November 1, 1941, Serial No. 417,529
"6 Claims.
(01. sis-e209)
paratively simple device permitting extreme‘ accu
that the passing of a locomotive and'c‘ars, oreven a
heavily-loaded truck,‘ at distances bf‘ several, hun
dred yards has been knownto ‘produce ‘a ground
racy of leveling as between a severalty- of points
fall below the iig-roomteveloping .1140, andv more.
located at horizontally spaced intervals.
sag, consequence causing a very‘ major discrep
ancy between the” gauge ‘points of thef'jig-frame.
This invention relates to a leveling system, and
for its general object aims to provide a com‘
While the invention is in no waylimited as to
Aftersuch a‘disturbancej as‘ long“-as't,en‘hours
application, its peculiar adaptability to the air
plane industry in truing the vertical ‘columns of
may be required forythe'jg‘roun‘d structure‘ below
the floor of the" jig-room to return-‘to normalcy,
jig frames mightalmost type the invention as a
speci?c therefor, and it is believed tube of bene?t
in point of clarity to herein prefacethe descrip
tion by brie?y considering the difficulty which has
been encountered inleveling a jig frame prelim~
inary to the start of ,a structural.._operation and
the practical impossibility, as leveling has been
wherefore it is essential to accuracy‘in the end
product of'the jig- that leveling compensationsbe
made at very frequent intervals during’theperiod
of ground readjustment.- 1'
- Having the foregoing in mind, it is a-lfur'ther
and a more particularobject of my inv‘ention'to
devise a system employing. the principles of the
liquidrtubelevellusing a riser, tube ‘for eachof the
several columns of the dig-frame, in association
heretofore carried on, of thereaftermaintaining
Within permitted tolerances the , trued condition
into which the Jig-frame has been put.
with indicator devices for ‘the Irespectiverisers
It may be here stated that the usual jig-frame
is composed of horizontalfloor girders, most gen 20 highly sensitiveto variations frQmaHpredeter
mined true level, the. entire system ‘being one
erally box-channel members, assembled together
substantially free from liability of becoming dis.-_
in a series of connected rectangular patterns and
each supporting, at spaced intervals of the length,
a severalty of upright columns, the whole being
ordered or defective and one which maybe quickly
and accurately read.
welded as a unit andfunctioning to produce altere 25
nate walk-ways and work-sections. Directly be
low each column is a jack-screw'enga'ging a nut
welded to the box-channel and ?nding a footing
points of the columns.
hereinafter described and claimed. I y .
. In thedrawingsr
l is a iragmentaryariewtalsen
.> ,.
V ; I.
1 .. M
on a bearing plate bolted to the concrete floor of
the ‘jig-room, the jack-screws ‘permitting a truing
of the jig-frame through the act ‘of raising or
lowering the box-channel girders at ‘the respective
,Theinventioniconsists in- thenQvel construction
and in the adaptationand combinationof part5
zontal section through amt-ties of aiisetrame
showing the new preferred embcdiment off- the
Fig. 2 is
an elevational
7 M
Fig. ,3 is a fragmentary itransv', rs" verticalsec
Transit levels have‘been more or‘less standard
heretofore as a means of arriving at a considered 35
true level, and while'such an instrument in the
Fig. 2.
hands of an expert is‘ highly‘ accurate, it has been
the exception rather than the rule to accomplish
a jig-frame leveling operation without exceeding
Fig. 4 is a fragmentary transverse vertical sec.
tionto a scale sun furtherenlargedand detailing
the‘ spirit-glass and‘ associated structure which I
tion' taken to an enlarged scale oriilinentry-[,3v of
_ '
the engineer's blue-print speci?cations‘of accept 40 employ as my'preferred indicator. ‘ ‘4
“Fig. 5 is a horizontal section ‘on line 5+5‘ of
able tolerance. However, aside from-the fact‘ of
the inaccurate results which often follow from
the use of transits where junior engineers have
been assigned to perform ‘the workof leveling the
jig-frames, the extended period of time required
for transit leveling is a majorobjection to their
use and has been a prime deterrent against carry
ing on periodic levelings during the structural
operation of building a wing or body part, as the
Fig. 6 is'a further‘enlarged
end‘ elevationalview
detailing the fulcrum mounting ‘for ‘the ‘spirit
glass and representing the Iatterin vertical sec
'I'he numeral H1,v ini‘the-drawings denotes the
horizontal box-channel members and H. the‘ verti
callcolumns of a jig-framesupported-by?ack
case may be, with'the frequency necessary to as 50 screws IZ inelevated relation above=5the ?oor [3
of a jig-room, the Jacki-screws lying immediately
sure the desired, if not a‘ctually‘the ‘required, ac
below the several columns and being'ofithe usual
curacy in the ultimate plane. As indicative of
the distortional stresses'to which a" jig-frame is -
construction providing abearing head, IZ-"Work
me against a foot~platee l4 'and'having a-lock-nut
subjected during a structural operation within the
same, it maybe pointedoutby way of example 55 15 for securing the" same inadjusted‘position.
According to the present invention I attach to
the box-channels I0 a series of connected pipes
constituting a supply main l6, and to this supply
main connect branch pipes I‘! to have the latter
out more than ordinary care, whereas .0075 vari
ation has been heretofore considered an excep
tional showing.
While I have illustrated and particularly de
rise to substantially similar heights perpendicu
larly along the sides of each of the jig columns
scribed the embodiment of the invention now
preferred by me, it is my intention that no
ll. Any means of support may be employed,
straps Ill-I8’ being indicated for this purpose.
limitations be implied therefrom, and that the
following claims be read with only such restric
Connected by the usual ?ttings to one of the
risers to have the same lie in- elevated relation
tions as are necessarily brought into the same to
distinguish over prior knowledge in the art.
above the same is a funnel reservoir 20 comple
What I claim is:
mented by a control cock 2|, and provided in the
l. A liquid-tube leveling system comprising the
supply main in proximate relation to this funnel
combination of a manifold having a plurality of
supporting riser is a drain valve 22.
substantially ?xed risers extending upwardly as
Indicated by 23 are vented hydrostatic level 15 branches to substantially similar heights from
ing heads ?tted with glass covers 25 and applied
the manifold; hydrostatic heads for the respec
in surmounting relation to the several risers, and ' tive risers; ?oat-operated indicator devices for
housed in each of these heads is an indicator in
the respective risers housed in said heads and
strument comprised of a bubble spirit-glass 25'
characterized by movement relatively in corre
having ?xedly hung from one of its endsa her
spondence with changing levels of the liquid
metically sealed ?oat 21 and being ?tted at its
within the related risers; means for supplying
opposite end with a bipedal stand of which the
liquid to the system for bringing the liquid with
two limbs 28 diverge downwardly from opposite
in a selected riser, employed as a prime reader,
sides of the longitudinal median line of the glass
to a desired level arrived at by recourse to the
and ?nd a pivotal footing in surface cups 30' of 25 related indicator device; and means having op
a fulcrum mounting 30. It will be understood
erative connection with the indicator devices of
that the'fulcrum mounting functionally locates
the other said risers permitting the latter to be
the ?oat, and that thisfulcrum point in the
individually adjusted relative to a related hydro
respective head might be formed as an integral
static head in attaining a reading of the latter
shelf in the event of collimating the system to 30 said indicator devices corresponding to that of
have each of the several branch pipes ll rise to
the prime reader, said means permitting correla
exactly the same height from the base plane of
tion as between the several indicator devices
the frame. Such a collimating procedure would,
without disturbing either the hydrostatic heads
however, be somewhat of a di?icult undertaking
or the liquid levels therein.
and may be obviated through the instrumental
ity of providing for ‘each leveling head a means
of adjusting the fulcrum point vertically. As
' a
2. A liquid-tube leveling system comprising the
combination of a manifold having a plurality
of risers extending upwardly as branches to sub
a means suitable for this purpose I have illus
trated the mounting 30 as having a depending
stem 3i arranged to slidably ?t in a cylindrical
socket 32 formed in a wing extension of the head.
_ The stem is held against revoluble shifting by a
key 33, and is adjusted vertically by a screw 34
which is ?xed in adjusted position by a lock-nut
stantially similar heights from the manifold; and
indicator devices for respective risers comprising
spaced relation below the level plane occupied by
the water-glass, its purpose being only that of
drostatic heads surmounting the respective risers,
said heads being vented from the undersides and
a bubble spirit-glass having a float carried from
one end thereof and at the other end being ?tted
with a bipedal stand of which the two limbs di
verge downwardly from opposite sides of the lon
gitudinal median line of the glass and ?nd a ful
35. Not indicated in the drawings but employed 45 crum footing functionally disposing the float rel
as a convenience to permit the spirit-glass to
ative to the liquid within the riser.
be set on the fulcrum‘ mounting of a respective
3. A liquid-tube leveling system comprising the
hydrostatic head in the absence of liquid within
combination of a manifold having a plurality of
the risers is an abutment rod carried transverse
risers extending upwardly as-branches to sub
ly'from one to the other side wall of the head in
stantially similar heights from ‘the manifold; hy
forming a rest for the outer end of the glass.
presenting substantially imperforate lids sealing
The mode of using the invention is believed to
be clear from the foregoing, but may be brie?y
summarized by stating that the jig-frame with
the chambers of the heads against gravitationally
deposited dust; and indicator devices for the re
spective risers housed in the hydrostatic heads
the leveling system applied thereto, following
and characterized by movement relatively in cor
erection, is ?rst trued through suitable instru
ments, following which the leveling system is ?lled
respondence with changing levels of the liquid
through the funnel with water or other desired 60
liquid with the admission being governed by re
course to the spirit-glass of the most convenient
riser, ordinarily the riser from which the funnel
is supported. Each of the remaining risers, which
is to say the spirit-glass thereof, is thereupon ad 65
justed by means of the respective screws 34 to
bring the indicator bubbles directly between the
within the related risers.
4. A liquid-tube leveling system comprising the
combination of a manifold having a plurality of
risers arranged to extend upwardly as branches
to substantially similar heights from the mani
fold, provided with pivoted means ?oat-operated
from the liquid within the risers and entirely
housed by the latter for indicating changing lev
els of the liquid within the respective risers, and
reading lines of the glasses.‘ It is, obviously, a
matter of but little time and e?ort to there 70 means for adjusting the pivots for said indicat
ing means vertically in relation to the ‘related
after ascertain discrepancies in the jig-frame as
between the several guide-points, and to correct
the same with the jack-screws to level the dis
turbed bubble or bubbles. Adjustments to with—
in .0015 of absolute level areaccomplished with
5. Structure according to claim 4 including
capping members surmounting the risers, pro
75 viding a chamber completely housing the related
indicator devices, and presenting inspection win
dows for viewing the housed indicators, said cap
ping members providing a vent leading upwardly
into a respective said chamber.
6. As a liquid-level indicator, and in combina
tion with a liquid container; a tube having an
indicator bubble hermetically sealed therein and
carrying a ?oat; means supported by the con
' 3
tainer forming a fulcrum-mount for the tube
to functionally dispose the ?oat relative to the
liquid of the container, and means for adjust
ing the fulcrum-mount vertically in relation to
the container for leveling the bubble of the tube
to varying selected levels of the liquid within the
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