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Патент USA US2126811

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Aug. 16, 193s.
n. G. RAMBO ET AL
cAsTER
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Filed July 15, 193e' `
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.2,126,811
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Patented Aug. 16, 1938
UNITED STATES PATENT `omer.
2,126,811
CASTER
Ingar G. Rambo, Wauwatosa, and Fred H. Graser,
Milwaukee, Wis., assignors, by mesne assign
ments, to Safway Steel Scafl’olds Co. of Amer
ica., Wilmington, Del., a corporation' of Dela
Application July 15, 1936, Serial No. 90,712
9 Claims; (Cl. 16--34)
'I'his invention relates to scaifolds and more
particularly to a scaffold which is adapted to be
converted from a stationary scaffold to a movable
or rolling scaiïold at will.
.
vOne object of the invention is to provide a
scaffold with a connecting member which will
have suflicient friction to maintain the members
against accidental disengagement while permit
lting them to be intentionally disengaged readily.
l0 '
Another object is to provide a _footing for a
scaffold employing the said connecting member.
` In certain classes of work, notably in the fin
ishing of the interior of buildings, it is desirable to
have a scaffold which is readily movable. At the
same time it is essential that the scaffold be se
cured against all movement when men are work
ing on the structure. Casters have proved ob
`,'lectional because the entire weight of the scaffold
and superposed load is borne directly by the
20 caster axle, which weakens the entire structure.
Another object is to provide a footing which
is convertible from a stationary to a. rolling foot
ing in which the stationary footing is substan
tially as strong as the scaffold sections which it
25
supports.
,
l
Another object is to provide 4a footing for a
scaffold or vthe like, which may be converted from
a stationary to a rolling footing and which in its
stationary position has all weight removed from
30
pins or axles.
y
.
A further object of the invention is to provide
'a suitable handle for the footing which wm per
mit the scaiïold to be readily shifted from the
rolling to the stationary footing.
35
Other objects will be apparent upon consider
ing the accompanying drawings and the following
' specification.
In the drawings:
`
Fig.. 1 is an end view of a scaffold of the type
40 shown and described in the United States patent
scaffold posts.
The scaffold is built up in sections, each sec- '5
tion comprising a pair of end frames I0 (one of
which is shown) spaced from each other and con
nected together by cross braces (not shown) in
a manner fully described in the aforesaid Uecker
patent. Posts I I of the end frames are connected 10
by horizontal braces I2-I2 and are preferably
made tubular to accommodate coupling pins
I3-I3 which are best shown in Fig. 6.
Referring to Fig. 6 it will be seen that the
pins .I3 comprise a tubular shank I4 of suf
ñcient size to ñt readily into'the tubular posts I I
of the frames I0. The ends of the tube I4 are
tapered as at I5, to permit easy entry into the
posts II. A collar I6 is formed of the same size '2
material as the posts II and is brazed onto the
tubular shank I4. This collar serves to hold the
pin securely in place in the post and rests on top
of one post Il when the pin I3 is in place, while
the superposed post ñts over the top ofthe pin 25
I3 and rests on the top of the collar so that the
superposed posts II are separated by the width
of the collar I6.
‘
A pair of friction grips I1 are formed of spring
material such as brass and project out through 30
an opening I8 in the side of the tube I4, as shown,
and contact the interior surface of the posts II
to prevent accidental withdrawal of the couplings. „
Any number of additional sections may be
superimposed on the lower sections and the scaf
fold built to any height.
A footing member. shown in Fig. 5, may be
placed on the bottom of the lowermost posts to
provide a suitable bearing surface.
The foot
ing comprises a tube 2li similar to the upper half 40
of the tubular shank I4 with a spring friction
to Reinhold A. Uecker, Serial No. 2,043,498, pat
ented June 9, 1936, 'showing the footing members
in both stationary and rolling positions;
grip 2l mounted therein to yieldably retain the
Fig. 2 is a sectional view of the rolling foot
nected to the tube 20. and provides suitable bear
ing surface to distribute the weight of the equip
ing for- the scaffold, the section being- taken
through the centers of the pivoted pin and the
wheel axle;
\
Fig. 3 is a side elevation of the rolling footing,
with parts being broken away to more clearly show
other parts;
-
Fig. 4 is a side elevation of a shifting handle
which is used to convert the rolling footing to the
stationary footing;
55
fold footing embodying the principles of this in
vention; and
Fig. 6 is an elevational view, partly in cross
section. of a connecting pin to join two adjacent
Fig. 5 is a cross-section of a stationary seaf
footing in place on the post.
f
A plate 23 is welded, as at 24, or otherwise con
ment to the foundation.
'
The rolling footing or caster is shown in Figs.
1, 2, and 3 and comprises a connecting tube 28
with a friction grip 29 therein, similar to the tube
2U'and grip 2|, respectively, of the footing shown
in Fig. 5. A plate 30 is connected to the tube 28
preferably by welding as at 3|, and forms a base
upon which the caster pivots about a vertical axis.
A yoke 33 is pivoted to the plate 30 by a nor- i
2
2,126,811
mally vertical connecting pin 35, which projects
through both the yoke 33 and the plate 30 and
the base plate and the bearing surface when in
one position to raise the caster wheel off the
may be riveted inside the tube 28.
bearing surface and support the base plate inde
pendently of the said wheel.
3. A caster of the character described compris
ing, a base plate, a yoke pivoted to said base plate,
The pin 35 is
designed to keep the yoke 33 and the plate in
spaced relationship with a ball race 36 between
the yoke and the plate 30 to insure free rotation
of the yoke.
a caster wheel carried by said yoke and adapted
A caster wheel 40 is mounted on a horizontal
to roll on a bearing surface, a pivot member car
axis offset from the axis of the tube 28 and pin
10 35 to insure the scaffold traveling in the direction
in which it is pushed. As shown in the drawings,
ried by said yoke, and a stirrup having an elon
the caster wheel has a bearing 43 which runs on
an axle 44 mounted on a carrying bolt 45.
lA stirrup 50 has one corresponding corner of
15 each leg rounded on a circular arc, as shown at
5|,upon which edge surface the stirrup is adapted
to rotate on the plate 30.
A longitudinally ex
tending slot 52 is formed through both legs of the
stirrup with the center portion of the slot approx
20 imately concentric with the arc 5l. Pins 53 ex
gated hole extending lengthwise and engageable
10
over said pivot member, said stirrup being en
gageable when in vertical position with the base
plate and the bearing- surface to transmit the
`load directly from the base plate to the bearing
surface.
15
4. A caster of the character described compris
ing, a bearing plate, a caster wheel swivelly
mounted from said bearing plate, a U-shaped
stirrup member` pivotally mounted from said
caster, a cam surface formed on one of the up
20
tend through holes in the yoke 33 and through
the slots 52, and have a head 54 formed on the
outside of the stirrup to prevent disengagement
wardly extending legs of the stirrup and engage
able with the und side of said bearing plate to
of the stirrup 50 from the yoke 33.
position, shown at B, Fig. 1, the caster Wheel is
mit the load directly from the bearing plate
through the stirrup to the ground.
25
5. A caster of the character described compris
ing, a bearing plate, a caster wheel swivelly
mounted from said bearing plate, a U-shaped
stirrup member pivotally mounted from said
30 raised off the floor and the entire weight of the
caster, cam surfaces formed on the sides of the 30
25
`
The pins 53 form pivots about which the stir
rup may rotate from its inactive position, shown
at A on Fig. l, to its active or supporting position,
shown at B in Fig. 1. In the active or supporting
scaffold is transmitted from the plate 30 through
the stirrup to the floor. It will be noted that the
position of the slots 52 precludes any possibility
of the scaffold weight being borne by the pins 53.
In its inactive position, A in Fig. 1, the stirrup
' 50 is on the trailing side of the caster wheel, so
that if the stirrup should touch the floor it would
stirrup at the open end thereof and engageable
with the under side of said bearing plate to raise
the caster wheel off the ground and transmit the
load directly from. the bearing plate through the
stirrup to the ground.
35
6. A caster of the character described com
not act as a brake.
prising, a bearing plate, a caster wheel depend
ing from and swivelly connected with said caster,
Fig. 4 shows a lifting lever 5l used to shift the
scaffold from position A to position B.
a stirrup member comprising a base plate, and a
The lever is made of rectangulary material, and
of Said base plate, cam surfaces formed on the
has a bent back end or hook 58 which engages
one edge of the stirrup 50, and a lug 59 spaced
from the hook 58 which engages the opposite edge
of the same leg of the stirrup 50. By applying
pressure to the outer end of the lever the stirrup
is caused to pivot about the pin 53 and transfer
‘ the weight of the scaffold from the caster wheel
40 to the stirrup 50.
A hook 60 is provided on the end of the lever
remote from the hook 58, to enable the lever to
be hung from the horizontal braces I2 joining
the posts Il.
Having thus described the invention, it is ap
parent that it is susceptible to Various changes
and modifications and it is not therefore, desired
to limit the invention to the precise form herein
shown and described, but only by the scope of
the appended claims.
60
raise the caster wheel off the ground and trans
What is claimed as new and desired to secure
by Letters Patent is:
side plate projecting upwardly from each side 40
upper ends of said side plates engageable with
the lower face of said bearing plate to lift the
caster wheel off the ground as the stirrup is ro
tated into vertical position and transmit the load 45
directly from the bearing plate through the stir
rup to the ground.
7. In a _caster of the character described, a
bearing plate, a caster wheel swivelly mounted
from said bearing plate, a stirrup comprising a 50
base plate and side plates on the opposite sides
of said base plate provided with elongated slots,
pivot means carried by said caster and engage
able in said slots to form a fulcrum about which
said stirrup may turn, cam surfaces on the upper 55
edges of said side plates engageable with the
lower faceof the bearing plate to lift the caster
off the ground as the stirrup rotates about the
fulcrum, whereby the weight is transmitted di
rectly from the bearing plate through the stirrup 60
to the ground.
1. In a device of the character described, a
8. In a caster of the character described, a
bearing plate, a yoke swivelly mounted on said
bearing plate, a caster wheel rotatably mounted
in said yoke, a stirrup comprising a `base plate 65
’ a caster wheel mounted on said axle, and a stirrup
and side plates on the opposite sides of said base
v pivoted to the yoke and engageable with the plate
plate provided with elongated slots, pivot means
to raise the caster off the ground and transmit` carried by said yoke and engageable in Said slots
the weight of the scaffold directly from the plate to form a fulcrum about which said stirrup may
through the stirrup to the ground.
turn, cam surfaces on the upper edges of said 70
_'2. A caster of the character described compris
side plates engageable with the lower face of the
ing. a base plate, a yoke carried by said base plate, bearing plate to lift the caster off the ground
a caster wheel carried _by said yoke- and adapted as the stirrup rotates about the fulcrum, where
footing member comprising, a base plate, a yoke
pivoted on an axis perpendicular to the plate,
- an axle carried by the yoke parallel to the plate,
to roll on a bearing surface, and means rotatable
about a pivot on said yoke and engageable with
by the weight is transmitted directly from the
bearing plate through the stirrup to the ground. 75
mamen-
9. In a. device of the character described, a
footing member comprising, a. bearing plate. a.
- 'caster swivelly- connected on à vertical axis with
the wheel thereof rotatable about e, horizontal
axis. and a. stirrup pivotally connected to the
footing member and adapted to be rotated on said
pivotal connection. -to position the stiri'up directly
.
v
‘
I3
between the bearing plete and the‘ground, and
transmit the weight ot the supported structure
directly‘therebetween, independent of said piv
otal» connection.
'
INGAR G. RAMBO.
FRED H. GRASER.
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