US915953A - Pulley-block. - Google Patents

Description

F. A. HALL.

PULLEY BLOCK.

APPLICATION FILED DBO. 7. 1907.

Patented Mar. 23, 1909.

2 SHEBTS-SHEET 1.

' INI'ENTOR -fia WIT/V s55 Attorney 4 F. A. HALL.

PULLEY BLOCK.

APPLICATION-FILED mm. 7. 1907.

Patented Mar. 23, 1909.

2 BHEETB-SHEET 2.

'L"! Li L l LJ L'I' LJ Al/orney UNITED .sTA ns PATENT OFFICE.

FREDERI'CKA. HALL, or NEW roan. N. Y

PULLEY-BLOGK.

- Specification of Letters Patent.

Patented March 23, icon.

I Application filed December 7, 1907. Serial No. 405,563.

skilled in the art to which it appertains to make and use the same.

My invention relates to an improvement in hoist blocks.

In all hoist blocks actuated by a hand chain, it is necessary to provide guides for preventing the actuating chain from running off the hand or actuating wheel.

The guides in use are objectionable owing to the fact that the side flanges of the actuating wheel, below the guides, are exposed, and when the block is being spun down, as in lowering, the chain links are free to ride over the edge of the wheel, and frequently catch or gag between the edge of the wheel and the guide, resulting in injury to the hoist block or chain. y

The object of my invention is to provide means for preventing the actuating chain from. engaging the side flanges of the actuating wheel between the guides, and it consists in the parts and combinations of parts as will be fully described and pointed out in the claims.

In the accompanying drawings, Figure 1 is a view in side elevation of a chain block embodying my invention. Fig. 2 is an end view of same. Fig. 3 is a bottom plan view.

Fig. 4 is a view in section through the guide strips and portion of the hand or actuating wheel and ig. 5 is a view in section showing the manner of attaching the chain guide to the frame of the block. I

The chain block 1 may be of any approved form, and is provided with a pocketed sheave 2 over which the hoist chain passes, and with a hand or actuating wheel 3 around which the hand or actuating chain 4 passes, in the well known manner.

5 are chain guides, each consisting of a body 6 and. an integral stem 7, the body having an opening therethrough for the passage of the chain 4, the opening being flaring and of greater diameter at its bottom than at its top, and the stem 7 being rigidly secured to the frame of the block in a vertical plane intermediate the hand wheel 3 and the pockl ted sheave 2, aroundwhich the hoist chain passes. These guides 5are preferably located slightly above the central diameter of the hand or actuating wheel 3 and operate to prevent the chain from leaving the wheel 3 at the top, or above the guides 5.

7 are guiding strips curved to conform to the periphery of the side flanges of hand wheel, and preferably integral at their ends with the guides 5, but'they may be separate therefrom and secured thereto by screws.

The inner edges of these strips 7 rest in close proximity to. the peripheries of the side flanges of Wheel 3, and are so shaped as to flare outwardly and downwardly, thus forming shields \ihich positively prevent the chain links from coming-in contact with the moving edges of the hand wheel, and alsofrom'wcdging between the uides 5 and the side flanges of the a heel. he two guides 5 thus connected by the strips 7, form a continuous guide encircling rather more than half of wheel 3.

The two side guides and the connecting strips above described, form an endless loop out of which it is not possible for the chain to escape, and which prevents the possibility of the chain becoming wedged.

\Vith this construction, when the hand wheel 3 is operated at high speed, these strips throw the chain into the pockets, and guide it to the end guides 5, and as the strips connect the two guides 5 there is no space between the latter "and the u heel 3 into which the links of the actuating chain can catch.

Another decided advantage this improvement has over the devices in use, is, that the ac uating or hand chain may be pulled at an angle on either side of the plane of the hand wheel, which would not be possible with the two end guides alone.

It is evident that many slight changes might be resorted to in the relative arrangement of parts shown and described without departing from the spirit and scope of my invention hence I would have it understood that I do not wish to confine myself to the exact construction shown and described,

Q meme iuig strips extending from one guide to the 1 hand Wheel and its chain, of two fixed ot' e1- edjecent to the flanges of the wheel, guides located on opposite sides thereof and and forming with the guides an unobstructed guiding strips secui ed at their ends #0 said endless loop through which the chain passes. guides and located adjacent, and CO1 'o'i'ining 5 2. In a chsiin block, the combination with to the periphery of the flanges of the a heel, :10 a hand wheel and its chain, of two chain the said guides and strips forining- :1 single guides secured to the frame of the block unobstructed endless loop through which the slightly above the axis of the wheel and on chain passes. opposite sides of the "latter, and guiding I Intestiinony whereof, I. have signed this 10 strips secured at their ends to the guides and specification in the presence of two suh- :35

the said guides and connecting strips forn1- ing an unobstructed endless loop conforming to the periphery of the hand wheel. 1 15 3. In a chain block the combination with FREDEHKJK A. HALL. Witnesses RoYAL Ti Ho'nenms, O. V. BnAvnn.

1 located ad acent to the fienges of the heel, i scribing witnesses.

I v l l

Images