CA1172198A

CA1172198A - Ladder mounted hoist

Info

Publication number: CA1172198A
Application number: CA000396063A
Authority: CA
Inventors: Donald Gagnon
Original assignee: Brunswick Mining and Smelting Corp Ltd
Current assignee: Brunswick Mining and Smelting Corp Ltd
Priority date: 1982-02-11
Filing date: 1982-02-11
Publication date: 1984-08-07

Abstract

ABSTRACT OF THE DISCLOSURE:
A hoist adapted to be removably mounted on a ladder is disclosed. The hoist comprises a hoist frame which slides onto the top of the ladder, a motor mounted on the frame, a spool containing a predetermined length of cable also mounted on the frame, and a buggy slidably mounted on the ladder and attached to the end of the cable.

Description

9~3 I,ADDER MOUNTED HOIST
Th.is invention relates to a ladder mounted hoist and more particularly to a hoist for use in underground mines to hoist materials (.drills, steel, pipes, etc.) up onto ore muck piles.
In underground mines, it is common practise to use - wooden ladderways of 50 feet or less in length which are set at an angle of approximately 45 to handle materials up and down the muck pile. Motor operated hoists exist of course, such as, for example, the one disclosed in U.S. Patent No. 3115211, issued December 24, 1963, or U.S.
Patent No. 4183423, issued January 15, 1980. However, these hoists are not well adapted for use in mining operations because they are too bulky. .In cut and fill stopes, for example, the ladderway is advanced as the mucking progresses and this means that any system used to move material up onto the muck pile must be compact, lightweight and portable. The hoist must, therefore, be easily removed from the ladderway. Hoists, such as the one disclosed in U.S. Pa ent No. 4183423, which are " ~

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permanently secured to the ladder are, therefore, not suitable for mining operations. As to the hoist disclosed in U.S. Patent No. 3115211, it is disclosed as being removably secured to the ladder but it is attached to the bottom of the ladder, out of reach of the operator which is working on the top of the muck pile. The system also requires a pulley located at the top of the ladder for passing the ~inch cable which is attached to the load carrying buggy. Threading of the cable off the pulley would make it more difficult to remove the hoist from the ladder.
It is, therefore, the object of the present inven- -tion to provide a ladder mounted hoist which is removably mounted on the top of the ladder so that it can be easily removed from the ladder by the operator working on the muck pile for moving the ladder or for installation on another ladder.
The ladder mounted hoist, in accordance with the present invention, comprises a hoist frame which slides onto the top of the ladder, a motor mounted on such a frame, a spool containing a predetermined length of cable also mounted on the frame, and a buggy slidahly mounted on the ladder and attached to the end of the cable.
A track is preferably secured to the face of the ladder for the buggy to slide on. The buggy is preferably provided with wheels attached to the underside thereof for riding on the tracks. Guides are also secured to the underside of the buggy for guiding the , . .

~ 3 --buggy as it slides on the tracks.
The invention will now be disclosed, by way of example, with reference to the accompanying drawings in which:
Figure 1 i5 a perspective view ofa ladder mounted hoist, in accordance with the invention, resting on a muck pile;
Figure 2 is a perspective view of the hoist;
Flgure 3 is a side-view of the hoist as it is asser~l.~d to the ladder;
Figure 4 is a partial view of a ladder having tracks mounted thereon;
Figure 5 is a side view of the buggy of the hoist;
and Figure 6 is an end view of the buggy.
Referring to figure 1 of the drawings, there is shown a ladderway 10 res-ting on a muck pile 12 and ~hich is made of one or several ladders, joined end to end, depending on the height of the muck pile. The ladders

2~ are normally made of wood sides 14 with rungs 16. The ladders are preferably 10 feet long and should be securely joined by using a butt jointand splice pieces.
The ladderway must be secured on the muck pile with the joints supported by muck or braces, such as braces 18.
Mounted on the top of the uppermost ladder is a hoist frame 20 which is more clearly shown in figures 2 and 3 of the drawings. The frame has hollow legs 22 which are joined by a transverse member 24. The inside dimensions of the legs are such as to easily slide onto .

-- ` 13 72~9l3 the ladder sides in order to allow easy removal of the frame from the top of the ladder. Two spaced brackets 26 are secured to the transverse member 24 for supporting a hoist motor 28. The hoist motor is preferably an air motor although an electric or other types of motors could be used. A shaft 30 supporting a spool 32 is rotatably mounted in suitable bearings 34 secured to the inside wall of the legs of the frame. The shaft is driven by the motor 28 through a roller chain 36 engaging a sprocket 38 secured to the shaft.
Referring back to figure 1, the spool 32 contains a predetermined length of cable 40, the end of which is attached to a buggy 42 which slides on the sides 14 of the ladderway. As shown in figure 4, straps 44 are pref-erably nailed to the face of the ladderway, directly on the sides 14, so as to act as tracks for the buggy to slide on. The straps may end short of the top of the uppermost ladder of the ladderway since the buggy does not slide all the way up.
Referring to figures 5 and 6, the buggy is preferably made of a piece of plywood 46 on the upper slde of which are secured side and end members 48 and 50, respectively, so as to form~an open top container.
Wheels 52 in the form of appliance casters are inserted into holes 54 in the plywood sheet underneath thebuggy to facilitate sliding of the buggy on the tracks 44. A chain or rope (not shown) is preferably fixed into appertures 56 in the front and back end members 48 and 50 to secure the load in the buggy. Guides 58 are 7~9~3 attached to the underside of the buggy. The guides are spaced by a distance, such as to fit inside the tracks 44 so as to guide the buggy on the ladder.
During installation, the frame 20 is slid onto the top of the ladderway as shown by arrow A in figure

3, and a compressor air hose is connected to the hoist motor. The buggy is attached to the rope end using a snap hook or shackle, and then the buggy is placed on the tracks. One man operates the hoist at the top of the muck pile and unloads material. One man loads the material at the foot of the ladderway. All material in the buggy is ~ecured by ~eans of chains or ropes.

Claims

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1. A hoist adapted to be removably mounted on the end of a ladder comprising a hoist frame, a motor mounted on said frame, a spool containing a predetermined length of cable also mounted on said frame, and a buggy adapted to be slidably mounted on the ladder and attached to the end of the cable.

2. A hoist as defined in claim 1, further comprising tracks adapted to be secured to the face of said ladder for the buggy to slide on.

3. A A hoist as defined in claim 2, wherein the buggy further comprises wheels attached to the underside there-of and adapted to ride on the tracks.

4. A hoist as defined in claim 2 or 3, further comprising guides also secured to the underside of the buggy for guiding the buggy as it slides on the tracks.

5. A hoist as defined in claim 1, 2 or 3, further comprising means secured to the buggy for attaching loads thereto.