US95971A - Improved safety-tackle - Google Patents

Description

SAFETY TRCKLE..

`BENJAMIN BELLAIBNQ 95971.

.FIG.2."

FIGJ.'

FIG.5;

PATENTE@1 @CT 19 i863@ dinited ictrs BENJAMIN BELLAR ,or PARIS, FRANCE..

L-enm PawmNo. 95,971, dazed october 19,1869.

The Schedule referred to in these Lettera Patent and making partof the Bam@- -To whom it may concern The improved safety-arrangement applicable to ordiuary vibratory tackle is shown in Figure 1, which represents a side view of such tackle.

The improvement consists in the employmentof a brake, 1'-, which embraces a large portion ot' the rope, where it passes over thepulley, andis piroted at its outer end, so that its curved portion, which constitutes the brake proper, can move around .the axis yThis brake receives the pressure required, iu order to hold the cord, by means ofa piece, k, in such manner that when the workman looses his hol'd on the rope, the

weight of the burden, by causing the block to tilt, as is usual in tackle of this kind, will cause the piece k to press upon the brake i., which, in its turn, will be pressed upon the rope, not only at one point, but over thewhole upper portion of the pulley.

The eii'ect of this arrangement is to avoid the wear of the rope, which, in ordinary tilting-tackle, is produced -by direct pressure of the piece k upon the rope. f

Figures 2 and 3 represent a side and a front elevation of my improved safety-tackle.

As thereshown, I mount on the axis of the pulleys a, a ratchet-wheel, l,'which is coveredand-protected by the outer cheek or face m of the block.

The pulleys are mounted loosely upon their coinmon axis, and move independent-ly of each other, as is usual; but that pulley next to the ratchet-wheel, and to which the brake is applied, is united withsaid wheel,- so that both have a common movement. Y

With the teeth of the wheel d engages a projection orteoth, a, formed ou the pawl-piece o, which is pivoted at p to the' brake propel', q. lhe latter is mounted and oscillates upon the axis fr, which is placed in ,the upper part of the pulley-block, and is so located that the brake, at the desired moment, can drop into the proper position to take hold of the ropepassing over the pulley above which said brake is placed.

Under this ariangemenawhen the workman pulls upon the rope s, in the direction of the arrow 1, for

the purpose of elevating the load at the other end of the rope, the pawl o will ride freely over the teeth ot' the ratchet d, but when he at any time looses his hold on the rope, the weight of the load tendsto pro duce traction in the direction of the 'arrow 2. This,

will at once engage with the ratchelwheehand thus instantly arrest the rotation of t-he pulley with which said wheel is united, and upon which the brake is now pressing.

When7 on the contrary, the workman desires to allow the load to descend freely, he draws upon a cord which is fastened to the pawl o at o', passes up through the eye fr,' on the'pulley-block, and thence extends down so as to be within convenient reach of the hand. By pulling this cord, the pawl o is iaised, and moves independently of the brake q, until it strikes, at or near its middle, against the top' of the block. The pawl then becomes a lever to raise the brake, the power being applied at the point o', the resistance being at p, and the fulcrum being its point of contact with the block, and by pulling on the cord, the pivoted end of the pawl will he forced down, carrying with it the axis p, which is united with the brake, and causing the latter to vibrate upon its axis lr so as to be removed from contact with the rope on the pulley.

The load is now free Jto descend, and its downward movement can be checkedat any point by releasing the cord and allowing the pawl and brake to drop back to their normal positions.

Instead of employing an auxiliary cord to unlock the brake and pawl, the rope itself may be made'use of for the purpose. To this end I have devised tho arrangement shown in Figure 4, which consists in causing the rope, which is on the side ofthe block opposite to that from .which the load is supported, to pass through a hole, u, in the frame c, which lat-tenis mounted on the axis of the pulleys, and is showndet-ached in Figure 5.

By drawing down t-lie rope vertically, the frame r will turn upon its axis, and the cross-bar s, at its upper end, will raise first the lpawl, aud then the brake, so as to disengage both, and thus allow the ratchet, pulley, and rope to move freely,

Having thus described my invention, and the man- What I'olaim, and desire to secureby Letters Patent, is

'The arrangement in the block,aud with relation to the pulley and ratchet-wheel ixed to the same, ofthe pawl o suspended above the ratchet-wheel, and pivoted to the rear end of the brake q, which vibrates upon as herein shown and specified.

In testimony whereof', l have signed my name to thisl specification, before two subscribing witnesses.

BELLAIR.

Witnesses F. Onoo'rr,

AMART.

however, at once causes the brake q to compress the rope with great force, while the tooth n of the pawl ner in which the same is or may be carried intoan axis over the pulley, and is actuated by said pawl,

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