Title:
Hoisting apparatus
United States Patent 2241275


Abstract:
Our invention relates to elevators, more particularly to improvements in portable elevators suitable for building operations. In the usual building operations where the building is more than one story it is customary to build temporary elevator towers on the job for hoisting building materials....



Inventors:
Edward, Shinn
Shinn Jr., Edward
Application Number:
US32364640A
Publication Date:
05/06/1941
Filing Date:
03/13/1940
Assignee:
Edward, Shinn
Shinn Jr., Edward
Primary Class:
Other Classes:
52/116, 182/63.1, 182/103, 187/225, 414/592
International Classes:
B66B9/16
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Description:

Our invention relates to elevators, more particularly to improvements in portable elevators suitable for building operations.

In the usual building operations where the building is more than one story it is customary to build temporary elevator towers on the job for hoisting building materials. Conventional portable elevators are not suitable for use except for comparatively low heights. Those of any height require elaborate auxiliary bracing which must be installed after the elevator is in position on the job and in case of carelessness in assembly, collapse and injury may result when the elevator is in operation. While some attempt has been made to provide collapsible types for easy transportation, those available require considerable space while being transported fromone point to another and cannot as a rule be carried easily as a unit in a disassembled condition.

Those that do have means for providing collapsing without completely knocking down the assembly provide a bulky piece of equipment which will not clear the usual head room that conventional trucks are required to clear. Furthermore, no ready or convenient means is provided for raising the elevator tower and locking it in operating position. In the usual arrangement the elevator platforms cannot be collapsed but must remain in operating position which still further increases the difficulty of providing a compact unit which can be easily collapsed or folded for transportation from one point to another. The usual conventional portable elevator is not capable of handling sufficiently heavy loads without considerable bracing external to the apparatus which must be assembled after the elevator is in position.

It is, therefore, the principal object of our invention to provide an improved type of portable elevator which may be collapsed and folded into a comparatively small space for quick and easy transportation from one point to another on conventional means available, such, for example, as conventional motor trucks ranging from two to five tons.

It is another object of our invention to provide such a device which upon arrival at the point of use can be quickly adjusted to operating position and which can be securely locked in operating position without the necessity of auxiliary external bracing ties and bolts and which nevertheless is strong, rigid and suitable for use to considerable heights.

It is another object of our invention to provide a device of this character which when folded in a collapsed position is capable of clearing substantially the same head room as the usual motor truck.

It is a further object of our invention to provide such an elevator in which the elevator platform can be folded into a small space and which nevertheless can be quickly adjusted to operating position and locked in this position for use.

Another object of our invention is to provide such a device which is capable of handling heavy loads at comparatively greater heights than portable elevators now available.

A still further object of our invention is to provide such a device which requires a minimum of locking elements to lock the elevator tower and elevator platform in operating position.

A still further object of our invention is to provide such a device in which the hoisting motor and cable can be used for the dual purpose of hoisting the tower into Operating position and can also be used for operating the elevator platform.

The novel features which we believe to be characteristic of our invention are set forth with particularity in the appended claims, but the invention itself will best be understood by reference to the following description taken in connection with the accompanying drawing in which Figure 1 is a side view in elevation of the elevator device made according to our invention and collapsed in folded position ready for transportation from one point to another, Figure 2 is a partial side view in elevation showing the tower and the elevator platform in operating position, Figure 3 shows details .f construction of the elevator carriage and elevator platform and Figure 4 is a view partially in transverse section showing the tower cross-section, frame and the elevator platform in operating position with roof extended.

As shown in Figure 1 the portable base is In this case a conventional motor driven truck II which carries a frame comprising the vertical columns II secured together at the top by the cross beam 12 and cross beam 1I. Pivotally mounted at the upper outside end of the frame at the point 14 is the elevator tower II comprising the U-channel-shaped hoist way 25 secured together by cross ties 25' and braced by the truss construction portion 28, this tower having a Ushaped transverse section as best shown in Figure 4 such that it can be telescoped over the frame comprising members 11, 12 and II. The frame member 12 is provided with one or more apertures 16 which when the tower is in a vertical or operating position registers with one or more apertures 17 in the tower proper, a locking element in the form of a threaded rod or bolt passing through these apertures for maintaining the tower locked in vertical position. The upper end of the tower carries the hoist cable pulley 18 over which the hoisting cable 19 is guided.

The portable base or truck carries the hoisting engine 20 which operates the elevator 21 when it is in operatipg position by means of cable 19 and also is used to rotate or pivot the tower into operating position by means of the same cable, which passes over the guide roller 23.

Pivotally attached to the top of the frame are roofing members 24 which can be swung outwardly, when the tower is in vertical position, to provide protection for the hoisting engine 20 and the operator. It will thus be seen that when the tower is in the collapsed position it telescopes over the frame II so that frame, tower and rofing members 24 all occupy substantially the same space on the frame, thus providing a most compact unit for transportation and requiring no more than the usual head room of conventional trucks.

Figure 2 shows the tower after being pivoted to the operating position to bring the apertures 16 and 17 into alignment so that the locking bolts may be inserted through those apertures and locked with a nut. It will thus be apparent that only one locking member need be used to lock the tower in operating position, thus eliminating all auxiliary bracing ties. Because the pivot is at the upper right hand edge of the frame member II and because the frame is encompassed within the legs 'of the transverse section of the tower, the load on the-platform is applied through channel members 25 and down through frame member II so that the turning moment on the frame and the portable base is substantially a minimum, the hoisting engine and the weight of the truck engine being more than sufficient to prevent any accidental overturning of the tower about the pivot point 14.

In order to raise the tower to operating position a locked loop is made in the hoisting cable 19 in any convenient manner and inserted through the open eye member 22 secured to the bottom of the tower as shown in Figures 1 and 2.

The tower is then pulled into operating position and after locking bolts have been inserted through the apertures 16 and 17 the loop in the hoisting cable is then released after which the elevator platform is opened up into operating position so that the hoisting drum and engine are then in position to raise and lower the hoisting platform by means of a hoisting cable. The tower is nicely balanced on the pivot point so that when it is desired to lower the tower after the locking bolts are withdrawn only a slight push is necessary to start the tower towards its horizontal non-operating position, the hoisting drum and cable being used to lower the tower gently to non-operating position. It will be noted in this operating position that the elevator platform has been opened up to operating position, the details of construction of which are shown in greater detail in Figure 3.

As shown in Figure 3 the elevator platform assembly 21 comprises a frame carriage having uprights 27 (only one of which is shown) the transverse members 28 and 29, this carriage frame being provided at its upper and lower ends with the guide rollers 30 and 31 which move in the channel-shaped hoist ways 25 of the tower.

Pivotally mounted at 32 is the frame 33 of cantilever construction upon which is supported the elevator platform 34, the pivoted sides 35 and 36 being maintained in operating position by the cross tie member 37. The platform may be locked in operating position by means of an extension 39 having an aperture registering with an aperture in the frame through which bolt 40 extends and locks the frame to the carriage in operating position.

Figure 4 shows the relationship of frame, tower and platform and the cross section of the tower in operating position.

While we have indicated the preferred embodiments of our invention of which we are now aware and have also indicated only one specific application for which our invention may be employed, it will be apparent that our invention is by no means limited to the exact forms illustrated or the use indicated, but that many variations may be made in the particular structure used and the purpose for which it is employed without departing from the scope of our invention as set forth in the appended claims.

What we claim as new is: 1. A portable hoisting apparatus comprising a portable base, a rectangular shaped frame on said base, an elevator tower of U-shaped cross section pivoted intermediate its ends to the top of and at one end of said frame and mounted to telescope over and lie against the top of said frame when in a collapsed position, a hoisting engine near the other end of said frame from the pivoted mounting of said tower, a roof member for said hoisting engine pivotally mounted to said frame and movable toward a horizontal position away from said frame when said tower is in upright position but foldable against said frame when said tower is in collapsed nonoperating position so that said tower, frame and roofing member occupy substantially the same space when in telescope position.

2. A portable hoisting apparatus comprising a portable base, a frame on said base, an elevator tower of U-shaped cross section pivoted intermediate its ends to the top of and at one end of said frame and mounted to encompass the frame between the legs of the U-shaped section when lowered to a non-operating position against the top of the frame, said tower including a pair of oppositely disposed U-shaped members rigidly secured together and providing hoist ways, the legs of said tower being of truss construction, an elevator carriage movable in said hoist ways and an elevator platform pivotally mounted on said carriage and collapsible against said carriage when said tower is in non-operative position upon said frame.

3. A portable hoisting apparatus comprising a portable base, a frame on said base, an elevator tower of U-shaped cross section pivoted intermediate its ends to the top of and at one end of said frame, and movable between a horizontal non-operating position and a vertical operating position and mounted to receive the top of said frame between the legs of the U-shaped cross section when said tower is moved to non-operating position against the top of said frame, hoisting mechanism within said frame, roofing members pivoted to the top of said frame and movable outwardly to provide a roofing over the hoisting mechanism when said tower is moved to its vertical operating position, an elevator carriage carried by and movable with respect to said tower, an elevator platform pivotally secured to said carriage and movable between a collapsed position against said carriage and an operating position perpendicular to said carriage, said frame and roofing members being received between the legs of said tower when in non-operating position and said elevator platform being positioned against said carriage when said tower is in nonoperating position for transportation.

4. A portable hoisting apparatus comprising a portable base, a frame on said base, an elevator tower pivoted intermediate its ends to the top of and at one end of the frame .and comprising a pair of U-shaped channel members oppositely disposed and rigidly secured together, said Ushaped channel members being provided with truss construction reinforced legs, said tower being movable as a unit from a horizontal nonoperating position on the top of said frame to an upright position on the frame, and means for engaging said frame and said tower to lock said tower in a vertical position, said channel-shaped members substantially registering with one end of said frame whereby pressure on said tower is transmitted to said frame at one end thereof, said tower being balanced on its pivot so that a slight pressure against the lower end of said tower when in vertical position will start said tower to horizontal non-operating position, and means for raising and lowering said tower. 5. A portable hoisting apparatus comprising a portable base, a frame on said base, an elevator tower pivoted intermediate its ends to the top of and at one end of the frame and comprising a pair of U-shaped channel members oppositely disposed and rigidly secured together, said tower being movable from a horizontal non-operating position on the top of said frame to a vertical position on the frame, and means for engaging said frame and said tower to lock said tower in a vertical position, an elevator carriage carried by said tower and movable in said channel members and carrying an elevator platform assembly, said elevator platform assembly comprising a cantilever frame pivotally attached at one end to said carriage and supporting a platform and having sides foldable against the elevator platform whereby said elevator platform assembly may be folded in collapsed position against said carriage for transportation purposes. 6. A portable hoisting apparatus comprising a portable base, a frame on said base, an elevator tower pivoted to the top of and at one end of the frame and comprising a pair of U-shaped channel members oppositely disposed and rigidly secured together for providing hoist ways, said Ushaped channel members being provided with truss construction reinforcing legs, said tower being movable as a unit between a horizontal nonoperating position on the top of said frame to an upright vertical operating position on the frame, and means for enaging said frame and said tower to lock maid tower in a vertical position, an elevator carriage carried by said tower and movable in said channel members and carrying an elevator platform assembly, said elevator platform assembly comprising a cantilever frame pivotally attached at one end to said carriage and carrying a platform and having sides foldable against the elevator platform whereby said elevator platform assembly may be folded in collapsed position against said carriage for transportation purposes when said tower is in horizontal non-operating position, a hoisting engine mounted on said portable base and a cable connected between said hoisting engine and said elevator carriage for operating said elevator platform assembly, when said tower is in vertical operating position, and means for connecting one end of said tower and said cable whereby said hoisting engine can move said tower to a vertical operating position from said non-operating position.

7. A portable hoisting apparatus comprising a portable base, a frame on said base, an elevator tower pivoted intermediate its ends to the top of said frame, and movable between a horizontal non-operating position and a vertical operating position, said elevator tower including a pair of channel shaped members, an elevator carriage mounted within said channel members, an elevator platform pivotally mounted on said carriage and collapsible against said carriage when said tower is in non-operating position on sPAd frame, said platform including sides pivoted thereto and means for maintaining said sides in an upright position on said platform.

8. A portable hoisting apparatus comprising a portable base, a rectangular shaped frame on said base, an elevator tower of U-shaped cross section pivoted intermediate its ends to the top of and at one end of said frame and mounted to telescope over and lie against the top of said frame when in a collapsed non-operating position, a hoisting engine mounted within said frame, a roof member for said hoisting member pivotally mounted to said frame and movable toward a horizontal position away from said frame when said tower is in operating position but foldable against said frame when said tower is in collapsed non-operating position so that said tower, frame and roofing member occupy substantially the same space when in telescoped position, said tower including a pair of oppositely disposed U-shaped members secured together and providing hoist ways, an elevator carriage movable In said hoist ways, a cantilever frame pivotally attached to one end of said carriage and supporting a platform having sides foldable against the platform and collapsible against said platform, said platform and sides being collapsible against said carriage when said tower is in non-operating position on said frame.

EDWARD SHINN, Ja.

EDWARD BHINN.