Material hoist
United States Patent 2143189

This invention relates to hoists such as are used in construction work and particularly in the construction of buildings, and the general object of the invention is to so design the hoist that material loaded on the platform of the hoist shall be automatically discharged when the platform is...

Ewing, Vernon L.
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Ewing, Vernon L.
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This invention relates to hoists such as are used in construction work and particularly in the construction of buildings, and the general object of the invention is to so design the hoist that material loaded on the platform of the hoist shall be automatically discharged when the platform is raised to a point above the cat-head of the supporting frame.

More particularly, it is an object of this invention to provide means whereby, when the platform is fully raised, the material will be permitted to slide down onto the floor of the building without the aid or assistance of workmen.

A further object is to provide a structure of this kind which may be cheaply made, which is easily set up and taken down, and which has been found thoroughly effective in actual practice.

My invention is illustrated in the accompanying drawings wherein: Figure 1 is a front elevation of a hoist constructed in accordance with my invention, the platform being in its lowered position.

Figure 2 is a horizontal section of the hoist on the line 2-2 of Figure 1.

Figure 3 is an enlarged section on the line 3-3 of Figure 1, the hoist being in its lowered position.

Figure 4 is an enlarged section on the line 4-4 of Figure 1, the hoist being in its elevated or unloading position.

Referring to these drawings, it will be seen that the frame of the hoist comprises two guides designated generally 10, which are spaced from each other any desired distance. Each of these guides which constitute the frame of the hoist, as illustrated in Fig. 2, consists of three vertically extending timbers 11, 12 and 13. The timber 13 is disposed between the timbers 1 and 12 and is bolted thereto by the bolt 14. The timber 13 extends inward beyond the inner edge faces of the timbers II and 12. Preferably a 1" board 15 is disposed against the inner face of the timber 12 and held in place by the bolts 14. Suitable transverse braces 15 are disposed at intervals and bolted to the uprights or guides 10, and diagonal braces 16 are also disposed at intervals in order to secure proper strength for this frame. Suitable foundation beams designated generally 17 are disposed below the lower ends of the vertical elements or guide beams II, 12 and 13 to act as a foundation. At the upper ends of the guides 10 there are disposed transverse beams 18 which support the sheaves 19 and 20. Extending over the top of these transverse beams 18 and extending downward at an angle to the horizontal are beams 21 constituting skidways which rest upon the floor A of the building, this building being diagrammatically shown. Braces 22 are disposed at intervals between the facade of the building and the frame of the hoist. Adapted to move up and down upon the guides 10 is a platform designated generally 23, which platform is mounted upon vertical members 24.

These vertical members are bolted to transverse elements 25 which have a length equal to the distance between the inner edges of the beams 11.

These transverse members 25 in turn are bolted or otherwise attached to vertical elements 26 which fit against the inner edge faces of the beams 13 and the vertical members 26 in turn are attached to transverse members 27 which fit against the inner edges of the beams 12 and are bolted to the vertical elements 26. It will thus be seen that a sliding structure is provided adapted to slide up and down upon the guides 10. The platform 23 is supported upon downwardly and rearwardly inclined beams 28 in turn supported at their outer ends by the downwardly and inwardly inclined braces 29 which extend down to and may be connected with the vertical members 24.

Disposed upon the upper surface of the platform are a plurality of wedge-shaped slides 30, whose upper edge faces extend downward and inward at a greater angle than the platform itself. Material such as boards, lumber, etc., may rest upon these slides and the inclination of the slides will cause this material to tend to move downward and inward. Pivoted upon the rear margin of the platform are hinged runners 31, the hinge being designated 32. These runners are normally in a raised position when the platform is lowered and are held in this raised position by bearing against the outer faces of the guides 10. When the platform has moved up beyond the guides 10 and just above the slanting beams 21, the runners will swing downward and against the upper faces of the beams 21 so as to form runways permitting the material on the platform to slide down the upper surfaces of the triangular slides 30 and down over the upper faces of the runners 31 onto the inclined members 21 and so onto the floor of the building. For the purpose of gradually permitting the rearward inclination of these runners after the runners have passed the upper ends of the guides, I provide rearwardly slanting guards 33 on the upper ends of the guides 10, so that as the platform rises to this point, the runners after they have passed the upper ends of the guides 10 and passed the beams 18, will be guided toward a rearward and downward position by the guards 33 in an obvious manner.

The platform is raised or lowered by means of the cable 34 which passes over the sheaves 19 and 20, the free end of the cable being connected to a hoisting engine while the other end of the cable, as shown, is connected in any suitable manner to the lowermost transverse cross beams 25a and 27a of the platform.

The operation of this structure will be apparent from what has gone before. When the platform is hoisted to the top, the platform will clear the top of the frame and as it rises above the guards 33, the runners 31 will swing downward into the position shown in Fig. 4, and the material will roll or slide upon the platform over these runners 31 and onto the inclined skidways 21 and so on to the floor of the building. This device is particularly adapted for hoisting lumber, reinforcing steel, steel lintels or any building material of this same general character necessary for use in construction work. The platform thus is automatically cleared of material and then may be lowered to another receiving position. The receiving position for the platform may be at a height such that material may be loaded from a wagon or truck directly onto the platform. In actual practice, the platform will be approximately between 4 ft. and 4 ft. 6 in. from the ground when the platform is lowered. Obviously the supporting frame may be of any suitable height.

While I have illustrated certain details of construction and certain arrangement of parts, I do not wish to be limited to these details except as defined in the appended claims.

What is claimed is:1. A hoist, including vertical guides, a platform mounted on the guides for vertical movement, the platform being downwardly inclined from front to rear, a platform support extending downward from the platform and having sliding engagement with the guides, skidways inclined downward from the upper ends of the guides, means for raising or lowering the platform and its support, runners hinged to the platform and normally extending upwardly and bearing against the guides but swinging downwardly to form an extension of the platform when the platform has been raised above the guides and to a level with the upper faces of the skidways, and skid members disposed upon the platform and extending from front to rear thereof, the members being inclined downward and toward the rear edge of the platform at an angle greater than the angle of the platform itself and said runners being hinged at the rear ends of the skid members. 2. A hoist, including a vertically disposed frame having laterally spaced vertical guides. each guide being formed of three longitudinal members laid flat against each other, the middle member projecting inwardly between the other two members, a running frame disposed between the guides and consisting of vertical elements and transversely extending horizontal elements disposed on each side of the vertical elements and extending at their ends beyond the vertical elements whereby to form vertically alined recesses in which the said middle members of the vertical guides slidably engage, the said vertical elements positioning against the adjacent middle members of the guides, a pair of vertically disposed beams secured to the horizontal elements of the running frame and projecting a substantial distance above the frame, a platform secured to the upper ends of said vertical beams at a downward inclination toward said guides, skid members extending across .,5 said platform and having their top surfaces downwardly inclined toward the adjacent guides, means connected with said running frame for shifting the same vertically between the guides, a runner member hingedly attached to the platform at the ends of the skids nearest the guides, said runner members being designed to slide against the faces of the guides and to swing to a downwardly inclined position and form extensions of said skid members when the running g3 frame has been shifted to a position where the platform rises above the upper ends of the guides, skidways connected with the upper ends of the guides and disposed upon the opposite sides of the same from the platform, said skidways having an angular relation with the guides corresponding to that of the platform whereby the platform and skidways will come into parallel relation upon the lifting of the running frame to maximum extent, and an inclined guard member at the inner end of each skidway and in the vertical plane of movement of said runners for guiding the swinging movement of the adjacent runner into operative position upon the skidway when the platform rises to discharging position above the guides.