Патент USA US2126811код для вставки
Aug. 16, 193s. n. G. RAMBO ET AL cAsTER ' ' Y Filed July 15, 193e' ` ` .2,126,811 . 2 sheets-sheet 2 E 25J ß' 2 25 .3.5 ‘5/ 30 \`I 45 IN VEN TOR. By /A/GA/e @P4/waa & @En ./í 6712/4552. e /Ö f ATTÓ , EY 2,126,811 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.