US95691A - Improvement in hoisting-apparatus - Google Patents

Description

. ani-ad .sans l atratctiiiir.

leg and the hook for the same,) of apair of ratchetlied.

WILLIAM M. HowLAND AND GEORGE L. HowLAN-D, or TvoPsHAM,

MAINE.

Letters Patent No. 95,691, dated October` 12, 1869.

.In/lovnMriNT IN solemne-APPARATUS.;

I The Schedule referred to in these Letters Patent and making part of the sa'me.

To all 'whom lit may concern the art to make and use the same, reference being had Y- to the accompanying drawing, forming part of Ithis specification.

This invention relates to improvements in apparatus for hoisting heavy weights, pulling stumps, and the like, by hand-power, and consists in the application to one of the legs of a-tripod, (which is detachably connected to the other two by a hook, having a double shank,.which is separated for attachment to the said leg, so as to provide a space between the end of `the wheels on a chain-winding shaft, a pair of pawls, con' 'necting-rods, operating-lever, and a device for throwing the pawls outof action with the ratchet-Wheels, under an arrangement whereby the stones or other weights may be raised or lowered the distance of one or more notches of the ratchetwheels at each movement of the lever, all as hereinafter more fully speci- Figure 1 represents a. perspective view of our improved pparatus, and

Figure 2 represents a sectional elevation of a part of the leg to wl1ich.`the operating-parts are connected.

The leg `A'is detachably connected to the other two', B, which are permanently connected together, by a hook, C, taking into a ring or eye attached to them.

This hook has a divided or double shank, the two parts D of which swell outward above the end of the leg A, and are fitted to the leg below the said swelled part, and permanently connected to'v it, one on4 each side.

Betweenthese parts D of the shank, at the place where they are so swelled outward', a chain-winding shaft, E, is mounted on journals, haring bearings in the said parts l), and having two ratchet-wheels, F, connected to it.

H'represents pawl-arms, working on the 4axis of the shaft E, one for each wheel.

They have pawls, I, for working the ratchets,fand are connected by rods K to a vibrating hand-lever, L, pivoted to the post A, at M.

N represents a pair vof gearing, or tripping springslides, for throwing the pawlswholly out of action with the ratchets, or so as to act on them only during a part of their throw.

These tripping-springs vare connected to a slide,.N, Working up and down on the leg A.

They are bent at the ends O, and so arranged 'that pins P, projecting from the pawls into the path ofthe' bent ends of the slide, will, on the goingback of the pawllever,.strike' against the parts 0,' and be raised by them and thrown out of action with the ratchets.

The rods K are connected to the hand-lever M on opposite sides vof the fulcrum M, so vthat in working the same by the said lever, one goes back while the other goes forward.

R is the chain for hoisting. One end is permanently connected tothe top of the legs B, and the other works over theA shaft E.

S is a sheave-block and hook, suspended on the chain, for 'attaching theweight, which, Ais hoisted by working the ratchets through the medium of the pawls,

pawl-levers, rod K, and hand-lever L, one pawl going hack for a vnew hold while the other is moving forward, 'carrying the latchet-wheels.

For 'lowering the weight, the slides N are arranged 'to trip the pawls when moving backward, and to allow them to engage with the ratchet-.wheels at the end of the movement forward, the one engaging just previons to the tripping of the other wheeh The ends of the tripping spring-slides spring downward under the force of the pawls, held by the pressnre of the teeth of the ratchet-wheel, so that the pawls are not thrown out until their pins'P are carried sufiiciently np the inclined parts of the tripping-springs beyond the abruptbends at 0. When they vare thrown out, the springs rise high 'enough to keep the pawls above the ratchet-teeth until they are 'brought forward of the abrupt bends, when 4they engage with the notches.

For increasing the speed in lowering, the spring- I slides are drawn downward, so as'to' l1o1dtl1e:disen gaged pawl out of contact with its wheel longer, allowing the other to move further back, and for; slowing tlxe lowering-speed, the slide is moved upward. When raising the weight, the slide is moved up high enough to prevent any action by it onv the pawls.

-The hand-lever L is arranged for ,connecting the rods K atdierent distances from the fulcrnm, for varying the leverage for dii'erent weights.

lhe leg/Ais made detachable from the others, for convenience in moving and storing the apparatus, but may be permanently connected, ii' preferred.

The operating-devices `may be applied to frames of other construction' and arrangement Having thus described our invention,

We claim as new, and desire tofsecure byLetters Patentf .'1. 'lhe combination, with the leg A, either permanently or detachably connected tothe legs B, and arranged for supportingthe chain-shaft E-in the parts Diof the divided shank of the connecting-hook, as described, of the chain-shaft, ratchet-wheels', pawls, pawlarms, pawl-lever, and connecting-rods, substantially as specified.

'2. The combination, with the pawl L, of thetrip- Y ping sliding-spring N O, snbstantially as speciiied. WM. M. HOWLAN D. Witnesses: GEO. L. HOVLAND. SAMUEL KNIGHT, v FRANK GoLBY.

fall down and

Images