US125064A - Improvement in hoisting apparatus - Google Patents

Description

2 SheetsnShee Patened March 26, 1872.

N. S. McFARLAN D.

Improvement in Hoistng Apparatus.

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' AM f/faTai/THomAF/flr c@ my. lasso/mdr macrm/ L M K UNITED STATES PATENT OFFICE.

IMPROVEMENT IN HOISTING APPARATUS.

Specification forming part of Letters Patent No. 125,064, dated March 26, 1872.

Specification describing certain new and use ful Improvements in Hoisting Apparatus, the

invention of NATHANIEL S. MCFARLAND, of the city of Brooklyn, in the county of Kings and State of N ew York.

This invention relates more particularly to double hoist-ways in which two cars are arranged to travel in reverse directions simultaneously, and connected so that the one car counterbalances and operates the other by means of chain with which either car alternately is loaded. The invention consists in various novel combinations and arrangements of parts, whereby great eciency and other advantages are obtained for said hoisting apparatus, and the cars are made to travel with an accelerated velocity. The invention also includes a novel and advantageous construction of brake for arresting the motion of either ear by clamping or clipping the opposite sides ofthe guides up and down which the car travels.

In the accompanying drawing which forms part of this specification, Figure l represents a side elevation of a double hoist-way or two hoist-ways arranged side by side, with my improvements in hoisting mechanism applied thereto; Fig. 2, a vertical section of the same at the line .r w,- Fig. 3, a sectional side elevation thereof; and Fig. 4, a vertical section at the line y y. Fig. 5 is a horizontal section through one of the hoisting-cars, showing a certain description of brake mechanism for checking or arresting the motion ofthe car at any desired point in its travel.

Similar letters of reference indicate corresponding parts throughout the several figures of the drawing.

A A' represent a double hoistway or two hoist-ways arrangedside by side. B B' are two cars fitted to travel up and down said hoist-ways, and connected to work simultaneously in reverse directions, as by ropes or chains b b, arranged to pass over pulleys C O of a free or independent shaft, c, situated at top of the duplicated hoist-way. D E and D' E' are upper and lower pulleys arranged above and below said hoist-way on opposite sides of it. Endless chains, belts, or ropes d d' are passed around each pair of .upper and lower pulleys D E D' E' for the purpose of operating the upper pulleys D D when required by pulling on the ropes d d'. On the shafts of the upper pulleys D D' are spur-gears F F', which gear with pinions G G on upper cross-shafts e e', when it is required to revolve the latter, but not at other times. For this purpose the shafts e e' are hung in swin ging frames or hangers H H', having their fulcrums at ff', so that by drawing the hangers toward each other the pinions G G' are thrown out of gear with the wheels F F', and on reversing the movement of the hangers said pinions and wheels are put into gear. The fulcrums of these hangers are so arranged that the latter by their weight serve to throw and keep the pinions G G' in gear with the wheels F F'. Upon the shafts e e' of the pinions G G' are spur-wheels I I', which, when the pinions G G' are thrown out of gear with the wheels F F' by swinging the hangers H H' toward each other, gear with an intermediate wheel, J, fast on the shaftc; but when the swinging frames H H' are allowed to return or drop so as to put the pinions G G' in gear with the wheels F F', then the wheels I l' are thrown out of gear with the intermediate wheel J. This last-mentioned wheel is of greater diameter than the wheels I I' for a purpose that will be hereinafter described. Upon the shafts e e' are also arranged fast chainwheels or pulleys K K', over which independent loose chains L L' are passed, said chains passing from stationary chain-boxes M M on the side of either hoist-way at their tops to chain-chambers g g', in or on the cars B B', for the purpose of loading either one of said cars with chain when it is required to lower it and elevate the other car. Either car is loaded with its chain L or L', as required, by suitably pulling on the rope d or d', controlling the pulleyD or D', wheel F or F', pinion G or G', and chain-pulley Kor K'.

- The swinging frames or hangers H H are operated as follows: Arranged above the hoistways, and intermediate of them, is a cross shaft, h, which is connected on opposite sides of its axis by chains or other connections i with the swinging frames H H. On this shaft is a toothed catch or holder, N, into which, when suitablyturned or adjusted along with its shaft, a toothed pawl, O, drops or bites for the purpose of holding the shaft h in its turned position. When the shaft h is thus turned and locked the swinging frames H H' are drawn and held toward each other, and the wheels I I' and J placed in gear with each other. 'Upon' lit'tin g the paw] 0 out of lock with the-catch or holder N, then the shaft h is released and the swinging frames or hangers H H' fall back by their weight, turning said shaft and the catch N in a reverse direction, and putting the wheels I I' out of gear with the wheel J, and thepinions G G' into gear with the wheels F F'. The pawl O is raised when it is required to put it out of lock with the catch N by pulling on a rope or chain, k, attached to the one end of a pawllifter, P, that may he a lever having an intermediate fulcrum. The rope 7c is extended down between the hoist-ways within reach of the operator in either cab, and is secured at the bottom ot' the structure. Another similarly arranged rope, l, is secured at the bottom ot' the struct-ure, and at its other end to the catch N, so that by pulling on said rope the shaft h is suitably turned to bring the wheels I I' and J in gear, andI catch N into position for the pawl O to drop into lock with it. To insure the pawl thus dropping, when required, and prevent failure thereof by the weight of the rope 7c holding up the pawl-lifter so as to interfere with the dropping of the pawl, the rope Z is provided with a knot or projection, m, which, on being Y depressed with the rope, catches on the pawllifter P and drops or lowers it out of the way ofthe pawl.

, The cars B B' are each provided with a brake for arresting its motion at any desired point in its travel, as when required to stop at any particular iioor in a building, or under other circumstances. This brake R consists of gripers or levers n n workingon vertical pivots o o, and arranged to clip opposite sides ofthe guides p p, up and down which the car travels, so that said gripers exert no tendency to strain on the guides or force them away from each other. These levers or gripers are made to clip or y press in opposite directions on the sides ofthe guides with any desired force by power applied to alever, q, which is in slotted connection with a sliding` plate, r. This plate has oblique slots s s, within which pins projecting from the levers 'n n t, so that by sliding the plate r in a given direction said levers or gripers are made to clamp the sides ot' the guides bythe combined action ofthe lever q andoblique slots s s, and power is communicated to said lever to eli'ect the clip by a rope or chain, t, accordinglyT as the same is wound on a barrel or windlass, u, through cra-nk or handle applied thereto. A pawl, o, and ratchet w serve to hold the barrel u at any desired point to secure a given hold ofthe brake, or to release it when required, by throwing the pawl o out of contact with the ratchet, when a spring, z, pulls on the lever q to throw back the gripers. By means of the obliquely-slotted slide or plate 1*, in combination with the mechanism for operating it, the` brake is brought into action by a combined lever and wedge-like force7 which gives a gradual and powerful hold on the guides.

In the operation of the apparatus the loaded car to be elevated is set in motion by pulling on the rope or chain d or d', so as to pay out chain L or L' from the one chain-box M or M' into the chamber g or g of the previously-elevated car till the weight of said chain overcomes that of the loaded car. To ett'ect this the pawl O is first pnt out of gear with the catch N, so that the pinions G G' are in gear with the wheels F F'. The operator then pulls upon the rope l to put the catch N in gear with the pawl O, and wheels I I' in gear with the wheel J, when the loaded car begins to ascend under the weight of the chain in the other car and the cars are caused to travel in reverse directions, the one ascending and the other descending, simultaneously with an accelerated velocity byreason ofthe difference in diameters of the wheel J and wheels I I' which causes the one drum K or K' to pay out chain and the other of said drums to pick up chain faster than the cars travel, so that it is only necessary to pay out by hand through the rope d or d' as much chain at first as is necessary to overcome friction and equilibrium ofthe cars in order to procure a starting torce and the accelerated motion afterward acquired by constantly adding chain to that alrea dy in the one car and diminishing from the quantity in the other car will give an et'ective power to overcome any resistance in the hoist-ways.

What is here claimed, and desired to be secured by Letters Patent, is-

1. 'Ihe combination ofthe chain-boxes M M', the chains L L', and chain-pulleys K K' with the cars B B', wheels or pulleys C C, and ropes or chains b b, when arranged for operation, substantially as described.

2. The combination ot thediierential gear I I' and J with the chains L L', the chain-pul leys K K', thecars B B', the wheels or pulleys C C, and ropes or chains b b, essentially as speciiied.

3. The swinging fra-mes or hangers H H', in

combination with the pinions G G', the wheels I l', the wheel J on the shat't c of the pulleys over which the car-ropes travel, the wheels F F', the pulleys D E D' E', and ropes or chains d d', substantially as specified.

4. The combination ofthe catch N and rope l with the pawl O, the connections i i, and the swinging frames or hangers H H', essentially as described. v

5. The knot or projection m on the rope l, in combination with the pawllifter P and rope or cha-in 7c, substantially as speciiied.

6. The brake It, when constructed and arranged tor operation in relation with the guides p p of the hoist-way, essentially as described.

' N. S. MCFARLAND.

Witnesses FRED. HAYNES, W. MORRIS SMITH.

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