US1503596A - Hoisting mechanism - Google Patents

Description

Patented Aug. 5, 1924s UITED `s'mrias Application filed May 31,

To all whom tmag/ concern:

Be it known thatlLJoHN A. MORRISON, a citizen of the United States, residing at Mansfield, in the county of Richland and State of Ohio,.have invented certain newV and useful Improvements in Hoisting Mechanism, of whichthe following is a'specification. i Y

This invention relates to hoisting mechanism andthe objectsof the improvement i are toprovide mechanism of this class in which the load is counterbalaneed, thus re# quiring very little power to raise a considerable weight.

rlphe above and 'other bbjects may be at tainedv by p'roviding'a frame in vwhich a lifting bar is vertically slidable and arranged to support the load,4 a vertically, slidable block beingmounted.adjacent to the lifting bar and carrying a' pinion meshing with a rack upon the lifting bar, Aa flexible member being connected to the lifting bar and passed upward over a pulley and downward to a point of connection with the slidable block, means being provided for normally preventing rotation of the pinion and for rotating the same in either direction to raise or lower the lifting bar.

' Anembodiment of the inventio-n thus set forth in general yterms is illustrated inthe accompanying drawing, inwhich-- Figure 1 is a side elevation of a hoisting mechanism embodying the invention;

Fig. 2, an edge elevation of the same;

Fig. 3, a side elevation of the slidable block; and

Fig. 4, a plan view of the same.

Similar numerals refer to similar parts throughout the drawing.

The mechanism is mounted ina frame comp-rising the base 1 and the spaced, parallel upright guides 2 and 3. preferably connected at their upper ends as at 4 for the purpose of strengthening the same.`

The lifting bar 5 is slidably mounted inthe guide-way 2 and provided with a head 6' at its upper end to receive the load, rack teeth 7 being formed upon the inner face of the bar.

A channel shaped block v 8 is slidably mounted in the guide-way 3 and the shaft 9 is journaled transversely therethrough, a pinion 10 being xed upon the shaft with-y in the channel portion of the block and PATENT .oFFieEg JOHN A. MOBRISQN, QFVLANSFIELD, GEIQ,y

1923. serial No, 642,463

meshing with the rack teeth 7 of the lifting bar.

A wormV gear 11 is fixed upon each outer end of the shaft 9. ,oA spaced pair o-f ears 12 extends outward from each side of the block 8 forming bearings -for the worm shafts 13, the worms 14 thereon meshing with the worm wheel-s 11, ball bearings 15 preferably being provided upon said worms.

The outer endof each lworm shafthis provided with a flat sided shank 16 to v'receive the socket of -a suitable tool fory rotating the same, and pinions 17k are fixed upon the worm shafts andmesh with anidler 18 j'o-urnaled as at 19 upon the frame.

A sprocket chain or other flexible mem' ber-19a is connected tofeach'side of the block 8 at the ,upper end Y thereof, preferably through the boss 20 and passes upward over a sprocket wheel or pulley 21 and downward to an ear 22 fixed upon the outer side of the lifting bar 5 and extended through the vertical slot 23in the frame.

Thus as the load is placed upon the upper end of the lifting bar, the same will be equally distributed between the lifting bar and the block 8 as a portion of the load is transmitted through the chains 19a over the pulley 21 to the block 8. Y

The kworms 14 meshing with the worm wheels 11 normally prevent rotation of the shaft 9, thus holding the parts against move- -ment by the placing of the load upon the through the same the shaft 9 and pinion 10 to raise or lower the 'lifting bar, moving the block 8 in the opposite direction, maintaining the flexible rmembers 19a taut, while under load. l n K As the load is thus -balanced between they lifting bar andthe slidable block 8, it will vbe seen that the load'itself assists greatlyl in Yraising the lifting bar, greatly-reducing the amount of power necessary to 'rotate the worms 14 to raise the load.

I claim 1. Athoisting mechanism including a ver tically movable rack bar, a vertieallymovable block, `a pinion carried by the block meshing with the rack bar,' a pulley,"a flexible member extended upward over the pulley and connected at opposite ends to the rack bar and block, means for normally preventing rotation of the pinion, and means for rotating the pinion to raise or lower the rack bar.

2. A hoisting mechanism including a vertically movable rack bar, a vertically movable block, a pinion carried by the block, meshing with the rack bar, a pulley, a flexible member extended upward over the pulley and connected at opposite ends to the rack bar and block, a worin gear rotatable with the pinion and a worm journaled upon the block and engaging the Worm gear.v

3. A hoisting mechanism including a vertically movable lifting bar, a vertically movable block, a pulley, a flexible connection extended upward over the pulley and connected at opposite ends to the block and lifting bar, and means upon the block for moving the lifting bar and block in opposite directions.

4. A hoisting mechanism'including a vertical frame, a rack bar slidably mounted therein, a block slidably mounted in the frame, a pinion upon the block meshing with the rack bar, a pulley upon the upper portion of the frame, a flexible member extended over the pulley and connected at opposite ends to the block and rack bar, gears rotatable with the pinion, oppositely disposed bearings upon the block, a worm shaft journaled in each set of bearings, a worm upon each worm shaft meshing With one of said gears, means operatively connecting the worm shafts, and means for rotating one of the worm shafts.

5. A hoisting mechanism including an upright frame, a rack bar vertically slidable therein, a channel shaped block vertically slidable in the frame, the teeth of the rack bar extending into the channel thereof, a pinion within said channel block meshing with the rack bar, a pair of pulleys upon opposite sides of the upper portion of the frame, a iexible member extended over each pulley and connected to the block and rack bar at opposite ends, a pair of worm wheels rotatable with the pinion and located upon opposite sides of the frame, spaced ears upon opposite .sides of the block, a pair of worm shafts journaled in said ears, a worm upon each. shaft meshing with one of the worm gears, pinions at the outer ends of the worm shafts, an idler upon the frame meshing with said pinions, and a flat sided shank upon one of the worm shafts for -receiving a tool torotate the same.

In testimony that I claim the above, I have hereunto subscribed my name.

JOHN A. MORRISON.

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