Title:
Extendible builder's tower
United States Patent 2284360


Abstract:
My invention relates to an improvement in builders' towers wherein it is desired to provide a tower which may be readily portable and which may be used to lift materials to a desired height in the erection of a building or the like. In past years it has been common practice to construct a...



Inventors:
Berby, Ola L.
Application Number:
US35200240A
Publication Date:
05/26/1942
Filing Date:
08/09/1940
Assignee:
CLYDE IRON WORKS
Primary Class:
Other Classes:
52/116, 187/900
International Classes:
E04H12/18
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Description:

My invention relates to an improvement in builders' towers wherein it is desired to provide a tower which may be readily portable and which may be used to lift materials to a desired height in the erection of a building or the like.

In past years it has been common practice to construct a scaffold adjacent a building which is being erected in order to provide an elevator which may be used in lifting materials used in the construction of the building. While such towers serve the purpose in most instances, it is often desired to move the location of the tower from time to time in order to avoid the necessity of hauling the material considerable distances after it has been elevated. Furthermore, when such a tower has served its purpose it must be torn down and entirely disassembled and rebuilt when it is desired to use the same again.

It is the object of the present invention to provide a builder's tower which may be moved from one place to another with comparative ease and which may be erected in an extremely short period of time without the use of steel erectors or of special erectors to accomplish this task.

This type of tower may be maintained in assembled form or in virtually assembled form and may be erected and folded into inoperative position in a few minutes time. Elevator towers which are not so constructed often take many hours to erect and disassemble and require skilled workers to do this work.

It is an object of my invention to provide a builder's tower which may be folded into inoperative position so that the tower may be removed from the base in a few minutes time. It is a further feature of my invention to provide a construction in which the tower may be folded down upon the base when it is desired to lower the center of gravity thereof in moving the tower from one spot to another.

It is a feature of my invention that the tower may fold down upon the base and be carried thereby with little danger of tipping. In folded position the center of gravity of the tower is extremely low and it would be necessary to tilt the base at an extreme angle to tip the same.

When in folded position the tower may be moved beneath overhead obstructions, such as guy wires and cables, and yet the tower may be erected in an extremely short period of time.

It is a feature of my invention to provide a builder's tower having a base which engages the tower at the lower extremity thereof and at a point spaced from the lower extremity. Removable pivots are provided both at the lower extremity of the tower and at the point of connection with the tower substantially above the surface of the ground. By removing the pivot means at the lower extremity of the tower, the tower may be folded down onto the base to rest thereupon for moving purposes. When the other pivot which engages the tower substantially above the surface of the ground is removed, the tower may be pivoted down directly onto the surface of the ground in order that the tower may be entirely detached from the base.

It is a further feature of my invention to provide a tower and a vertically movable elevator platform mounted entirely to one side of the tower. Providing the platform entirely to one side of the tower permits easy loading and unloading of the elevator platform and permits the tower to be placed with its longitudinal axis parallel to a building wall in such a manner that wheelbarrows, concrete carriages and the like, may be loaded onto the platform from one side thereof while the platform is lowered and may be removed from the opposite side of the platform when the same is in elevated position. This feature is important as it permits the tower to be moved longitudinally along the wall from one point to another when it is so desired.

These and other objects and novel features of my invention will be more clearly and fully set forth in the following specification and claims.

In the drawings forming a part of my specification: Figure 1 is a perspective view of the tower in erected position, showing the elevator platform in elevated position.

Figure 2 is a side elevational view of my builder's tower, showing in full lines the position of the tower when it is folded down upon the base and illustrating in dotted outline the position of the tower as it is being lowered onto the ground.

Figure 3 is a side elevational view of the head of the tower.

Figure 4 is a top plan detail view of the head of the tower.

Figure 5 is a cross-sectional view through the tower, looking down upon the boom attachment.

Figure 6 is a side elevational view of the portion of the tower to which the boom is attached.

Figure 7 is a transverse section through a portion of the base of the tower, showing the tower rest for supporting the tower in folded position.

Figure 8 is a side elevational view of a portion of the base and tower, showing the pivotal connection between the tower and base.

Figure 9 is a front view of a portion of the base and tower, showing the pivotal connection between the base and the lower extremity of the tower.

Figure 10 is a bottom plan view of a portion of the tower, showing one of the lower pivots thereof.

Figure 11 is a side elevational view of a portion of the tower and of the top extremity of the base, showing the upper pivotal connection between the base and tower.

Figure 12 is a sectional view through the tower, showing the upper pivotal connection between the tower and the base.

Figure 13 is a side elevational view of a portion of the tower, showing the connection of the platform to the tower.

Figure 14 is a cross-sectional view through the tower also illustrating the connection between the platform and the tower.

The hoist A includes a base 10 provided with a pair of longitudinally extending parallel runners 11. Upon the runners ii is mounted a platform 12 upon which is located a suitable hosting apparatus 13 including a motor 14, a rear cable drum 15 and a front cable drum 16. The cable drums 15 and 16 are rotated by the motor and operate the cables to raise and lower the elevator platform and to erect the tower in a manner which will be later described. Suitable brakes are provided for the cable drums 15 and 16 as is usual with devices of this sort so that the speed with which the elevator platform and the tower is lowered may be regulated.

At the forward end of the base 1I, I provide a pair of parallel upright supports 17 connected at the bottom to a transversely extending platform 19 in the manner best illustrated in Figures 8 and 9 of the drawings. Angularly extending braces 20 extend from the base 10 to the upper extremity of the uprights 17 to strengthen these uprights and to reinforce the same.

Side braces 21 are connected to the transversely extending cross member 19 and are secured to the uprights 17 near the top thereof to support these uprights from the side. Reinforcing brace -members 22 extend from the braces 20 to the cross member 19 to act as a support for the operating pulleys and to further reinforce the braces 20.

The tower 23 is preferably constructed with a pair of outwardly extending angle guides 24 in parallel spaced relation and with a third angle 25, the front angles 24 and the rear angle 25 being arranged in triangular formation. Cross braces 26 connect the angles 24 and other cross braces 27 connect the angles 24 with the rear angle 25, forming the apex of the triangle. Diagonal braces 29 extend between the cross braces 27 to further reinforce the tower. This type of triangular tower is extremely strong as is required because of the eccentric loading provided by the cantilever mounting of the elevator platform.

The vertically extending angles 24 and 25 are formed in sections which may be bolted one above the other to form a tower of the desired height.

A tower head best illustrated in Figures 3 and 4 of the drawings and indicated in general by the numeral 30, is secured at the top of the tower.

It will be understood that this head 30 may be iemoved if it is so desired and an additional section of tower may be added to the top of the tower illustrated, the head then being secured at the top of the added length of the tower.

Thus it will be seen that my tower may be formed of the necessary height for a certain job and if it is so desired the tower may be relatively short at the start of the erecting process and may be lengthened from time to time as the height of the building is increased.

The head 30 includes a transversely extending angle 31 designed to connect the angles 24 and angularly arranged angles 32 connecting the angle 24 with the angle 25. A reinforced channel plate 33 projects rearwardly from the angles 32 at the apex thereof and is provided with a hole 34 therethrough for attaching the top of a boom supporting guy wire 35 by means of a shackle and bolt.

A pair of spaced angles 36 extend upwardly from the transverse angle 31 to form a bearing for apulley 37 mounted on a pivot 39 extending through these angles 36. Brace plates 40 extend between the angles 32 and the front angle 31 to further reinforce the head 30.

If it is desired a boom 41 may be mounted upon the tower projecting rearwardly from the rear angle 25. This boom 41 is secured upon a vertical pivot 42 best illustrated in Figures 5 and 6 of the drawings. The pivot 42 projects upwardly from a plate 43 projecting rearwardly from the rear angle 25 and a pair of parallel plates 46 also project rearwardly from this angle 25. A pulley 47 is pivoted on a pivot pin 49 between the plates 46 to support the cable which is used in conjunction with the boom 41. A pulley 50 is mounted at the outer extremity of the boom and raises the cable from the pulley 47.

Obviously the boom 41 may be swung through 85 a wide angle about its pivot 42 and is held at fixed height by the boom guy wire or supporting cable 35. At the rear end of the base 10 I provide a pair of standards 51 secured at their lower extremity to the base 10 and converging together at the top and secured to a connecting plate 52.

The plate 52 is provided with a V-shaped notch 53 therein to accommodate the tower 23. The angle 25 of the tower 23 fits into the notch 53 when the tower is in folded position and the standards 51 support the tower 23 in this folded position.

As is best illustrated in Figures 11 and 12 of the drawings, a pair of brackets 54 extend rearwardly from the opposed sides of the tower 23 and are connected by braces 55 to the angle 25.

A pair of tubular bearings 56 are supported by the brackets 54 and by the sides of the tower and are designed to contain pivots 57. The pivots 57 extend through the upper extremity of the upright members 17 and into the bearings 56 pivotally connecting the tower 23 to the base 10 at the upper extremity of the uprights 17.

Bolts 59 or locking pins are used to hold the pivots 57 in proper position.

At the base of the tower 23 the angle 25 terminates substantially above the lower extremity of the angles 24 and triangular connecting plates 60 are welded to the .angles 24 to form the lower extremity of the tower. As best shown in Figures 8, 9 and 10 of the drawings, a pair of pivots 61 extend transversely from the angles 24 and engage in notches 62 in the forwardly projecting base members 63 mounted on the base 10.

A pair of locking pins 64 having angularly extending heads thereupon slidably engage in suitable receiving apertures 65 adjacent the notches 62, and these locking pins 64 hold the pivots 61 locked in place in the notches 62. When the locking pins 64 are removed, the tower 23 .can tilt rearwardly about the pivots 57 into the position illustrated in full lines in Figure 2 of the drawings. If, however, the locking pins 64 are retained in place and the pivots 57 removed, the tower 23 may pivot forwardly in the manner illustrated in dotted outline in Figure 2 of the drawings.

The elevator platform 66 is substantially constructed and may, if desired, be provided with a rail 67. The platform 66 is provided with vertically extending angular supports 69 which are 1 provided with a pair of spaced rearwardly extending ears 70 near the upper extremity thereof. The shafts 71 extend through the ears 70 to support rollers 72 which engage the rear surface of the angles 24. A shaft 73 extends through 1 each of the vertical supports 69 to support a roller 74 which engages the front surface of the angle 24. The rollers 74 are positioned near the surface of the platform 66 while the rollers 72 are spaced considerably above the level of the 2 platform. The platform 66 is thus mounted on a cantilever supporting arrangement, the weight of the platform tending to draw the rollers 72 against the rear surface of the angles 24 and also tending to urge the rollers 74 against the 2 forward surface of these angles 24. When the tower 23 is first erected, the pivots 61 are placed in the notches 62 and the locking pins 64 are positioned to lock the pivots in place. The tower 23 is lying at this time upon the ground with 3 the angles 24 lowermost and the angle 25 uppermost. In order to erect the tower a block 75 is secured by a flexible cable 76 to the point 77 on the braces 20. A pair of spaced cable guides 79 project upwardly from the upper extremity of the 3 uprights 17 to guide the cable 76 over the top of these uprights. The rope 80 from the rear cable drum is then threaded beneath the pulley sheave 81, under the pulley 47 on the tower 23, up around the block 75, down and around the 4( sheave 48 adjacent the sheave 47, again through a sheave in the block 75, to a dead end adjacent the sheaves 47 and 48. Thus by operation of the engine 14, the rear cable drum 15 may be rotated to exert a pull upon the cable 80 which tends 4 to pull the sheaves 47 and 48 toward the block 75. The tower 23 pivots about its pivots 61 and may be eased into erected position, in which position the tower may be retained by insertion of the pivots 57. Before erection of the tower 23, the rope 82 from the front cable drum 16 is extended under the sheave or pulley 83, through the tower to the head, over sheave or pulley 37 in the head, and may be dead-ended either to the platform 68 or may if desired, extend about a pulley on the platform and be dead-ended at the head 30. No pulley is shown on the platform 66 as in the form shown the cable 82 is dead-ended to this platform. When it is desired to lower the tower the foregoing procedure may be reversed and by using the brake on the rear cable drum 15 the tower may be lowered to the ground.

When it is desired to lower the center of gravity of the building tower for moving purposes, the cables may be rearranged to accomplish this result. The cable 80 from the rear drum 15 is extended under the pulley 81, over the pulley 84 at the base of the tower 23, down around the pulley 83, up over the double pulley 84, down to a dead-end adjacent the pulley 83. The lock pins 64 holding the pivots 61 in the notches 62 may then be removed and the base of the tower 23 pried forwardly to start the downward movement thereof. By use of the brake on the rear cable drum 15 the tower 23 may be folded down about the pivots 57 into the folded position illustrated in full lines in Figure 2 of the drawings. When in this position, the center of gravity of the tower is greatly lowered and the tower may be readily moved from place to place.

In accordance with the patent statutes I have described the principles of construction and 0 operation of my builder's tower, and while I have endeavored to set forth the best embodiments thereof, I desire to have it understood that obvious changes may be made within the scope of the following claims without departing from the 5 spirit of my invention.

I claim: 1. A portable tower comprising a base, a tower element, means on said base engaging said tower element at a point spaced from the lower end 0 thereof, a pivotal connection between said engaging means and said tower element whereby said tower may be folded with respect to said base, and a second pivotal connection between said base and the lower extremity of said tower, 5 whereby said tower element may be folded down upon the ground.

2. A portable tower comprising a base, a tower element, a support on said base engaging said tower element at a point spaced from said base, 0 a removable pivotal connection between said support and said tower element, a second pivotal connection between said base and the lower extremity of said tower element, and means on said base for pivoting said tower element about each of said 5 pivotal connections.

3. A portable tower comprising a base, a tower element projecting upwardly therefrom, a removable pivotal connection between said base and said tower element whereby said tower element may Sbe pivoted down upon the ground or up into vertical position; a support on said base engaging said tower substantially above said base when said tower element is in vertical position, a second removable pivot connection between said tower 5 element and said support, whereby said tower element may be pivoted between its ends in a second direction, and a second upwardly extending support on said base engageable with said tower element when said tower element is folded down about said second pivotal connection.

4. A portable tower comprising an elongated base, a hoisting unit at one end of said base, a tower element projecting upwardly from the other end of said base, a support on said base engaging said tower element at a point substantially above said base, a transversely extending removable pivot means connecting the lower extremity of said tower element to said base, a second transversely extending pivot connecting said tower element to said support, and means connecting said tower element to said hoisting unit to pivot said tower element by said hoisting unit.

5. A portable tower comprising an elongated base, a hoisting unit at one end thereof, a tower element at the other end thereof, a transverse removable pivot connecting said tower element to said base whereby said tower element may be pivoted forwardly from said base to rest upon the ground; a support projecting upwardly from said base, a removable transverse pivotal connection between said tower element and said support whereby said tower element may be folded down between its ends to overlie said base, and means connecting said hoisting unit to said tower element to pivot the same.

6. A portable elevator comprising a base, a hoisting unit on said base, a tower element, parallel removable pivots connecting said tower element to said base at vertically spaced points; both said pivots operable, when engaged, for holding said tower element in erect position, one of said pivots permitting pivoting of said tower element forwardly from said base, the other of said pivots permitting pivoting of said tower element rearwardly to overlie said base, a carriage means slidably secured to said tower element, and means connecting said hoisting unit to said tower element for pivotal movement in either direction, and means connecting said carriage means to said hoisting unit for raising and lowering the same in erect position of said tower.

OLA L. BERBY.