US847955A - Snatch-block. - Google Patents

Description

No. 847,955. PATENTED MAR. 19, 1907.

. J. N. LINDSAY. SNATGH BLOQK.

APPLICATION FILED JAN. 28, 190?.

2 SHEETS-SHEET 1.

WITNESSES.

Jofifl Ml 67701942 I (r7 TORNFY ms NORRIS PETERS co 'wlsmnmay p. c.

No. 847,95'5. PATE'NTED MAR. 19, 1907. J N. LINDSAY.

SNATGH BLOCK.

APPLICATION TILED JAE. 28, 1907.

2 SHEETS-4311B! 2.

BY W A OHNEY UNITED .s'rA as PATE T o ls iron.

JOHN N. LINDSAY, or FALL CREEK, OREGON,

J SNATQH-BLOCK.

Specification of Letters Patent.

Patented March 19, 1907.

Application filed January 28,1907. SerialNo. 354,528.

-- such as will enable others skilled in the art to which it appertains to make and use the same.

The object primarily of my invention is to provide a form oflubricating roller-bearing snatch-blocker logging-block which shall be front face or cheek of the block shall not become unlatched, and thus obviates danger of breaking of the block.

Further objects will appear as the specification proceeds.

In the accompanying drawings, Fi ure 1 is a front view in elevation of the block. Fig. 2 is a similar view, the front hinged portion of the block being opened. Fig. 3 is a side view in elevation of the block. Fig. 4 is a' front elevation, the front face or cheek of the block being removed to display the ulley, the cone, and the roller-bearings. Fig. 5 is a rear elevation of the front face of the block. Fig. 6 is a detail view of the bridge, and Fig. 7 is a central longitudinal transverse section through the device.

Referring to the drawings in detail, A represents the front face or jaw of my device,

which is, as shown, in two piecesa lower member a, provided w1th a central opening a i therethrough, with a neck a and with cutaway portions a on each side of the neck, and an upper member a provided with legs a a, straddling the neck a and adapted for hin ed movement on a pin a, passing through the ower portion of the legs and through the lower part of the neck and also provided with an upper openinga A represents the rear jaw or face of my device, and B an ordinary form of swinging cross-head or bridge.

Secured firmly at its lower end to the member a is a spring catch or latch 0,", adapted to ellliiige a side groove a in the cross-head.

block, the spring-latch is pulled sidewise out of en agement with the groove and the hinge portion of the front jaw then ulled forward on its hin e; and when it is esiied to close the jaw t e same is simply moved on its hinge until the spring-latch springs automatically into the side groove a" of the cross-head. Many snatch-blocks are injured and broken by the front hinged shell or jaw coming loose but this is impossible with my form of safety-latch.

A shaft-pin a is screwed into a central opening a in the rear jaw or shell A and the front jaw A is assembled by screwing it on the threaded end 0, of the pin.

The two shells are held at their lower ends against sidewise displacement by a tail piece or space member a, which is a hollow collar, a headed pin a passing therethrou h and being screwed into the rear jaw, where y the collar and pin may be removed at pleasure to separate the parts for cleaning, or repairing or the like.

Keyed to the shaft-pin a is a collar or bushing o whereby the same is detachable and may be removed when worn and a new one keyed on.

A sheave or pulley C moves on roller-bearings a", disposed insthe central opening 0 of the sheave and around the collar or cone Extending at a downward incline through the neck a desirablyeat an angle of forty-five degrees, is an oil-cavity a, its lower end terminating in line with the roller-bearings, so as to discharge thereinto. By reason of-the inclination of this oil-cavity the same may be filled when the block is hangin perpendicular or lying horizontally equal y as well in either position or in any intermediate position and also permits feeding out of the oil to the bearings in any position which the block may occupy.

It will be observed from the fore oing description, taken in connection with 316 drawings, that my device may be taken entirely apart, this being accomplished by simply unscrewing and removing the pin a, then unscrewing the front face or shell A and removing the sheave and unkeyin the collar or bushing 0). This removabihty of all parts en it is desired to open the l of my device is,an important factor in the log success of my invention, for it permits of thorough cleaning and repairing Whenever needed.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. A snatch-block comprising two jaws or shells, a sheave or pulley disposed therebetween, and a shaft-pin for supporting the sheave and having threaded engagement, at each end, with the two shells.

, 2. A snatch-block comprising two jaws or shells, a sheave or pulleydisposed therebetween, a shaft-pin for supporting the sheave and having threaded engagement, at each end, with the two shells, and a detachable bushing or collar keyed to the shaftpin.

3.. A snatch-block comprising two jaws or shells, a sheave or pulley disposed therebetween, a shaft-pin for supporting the sheave and having threaded engagement, at each end,- with the two shells, a hollow spacingcollar disposed between the lower ends of the shells, and a pin passing through the collar and the two shells and having threaded engagement with one of the shells.

4. A snatch-block comprising two jaws or shells, the upper half of the front jaw being hinged so as to swing downward and forward, a shaft-pin for supporting the sheave and having threaded engagement, at each end, with the two jaws, a swinging cross-head for the jaws, provided with a side roove, and a spring-latch secured at one en to the front jaw and adapted to automatically enga e the groove in the cross-head to lock the hlnged aw.

In testimony whereof I aflix my signature in the presence of two subscribing witnesses.

JOHN N. LINDSAY.

Witnesses:

JEssE A. FOUNTAIN, A. N. BOYD.

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