US1817949A

US1817949A - Snatch block

Info

Publication number: US1817949A
Application number: US455301A
Authority: US
Inventors: Temple C Smith
Original assignee: American Telephone and Telegraph Co Inc
Current assignee: AT&T Corp
Priority date: 1930-05-24
Filing date: 1930-05-24
Publication date: 1931-08-11
Anticipated expiration: 1948-08-11

Description

Aug. 11 1931. 1-. c. SMITH 1,817,949

v CH BLO Filed llay 24. 1930 INVENTOR Z 6'. Smith ATTORNEY Patented Aug. 11, 1931 rFi- TEMPLE 0. SMITH, or WESTFIELD, NEW Jnnsng, ro Eases-seas an]; TELEGRAPH oorarenv. A ooneonn'rron new YORK SNATCH BLOCK Application filed. May 24, 19st; s'fiii sa- 55361.

This invention relates to snatch-blocks of a type particularly adapted for use with hoisting or cableconveying apparatus, and the like.

An object of the invention consists in the provision of an improved snatch-block which will prevent accidental disengagement of a cable therefrom.

A further object consists in the provision of such snatch-block in a comparatively simple and inexpensive manner.

The novel features which are considered characteristic of this invention are set forth with particularity in the appended claims. The invention itself, both as to its organization and method of operation, together with other objects and advantages thereof, will be further explained in the following detailed description having reference to the accompanying drawings, consisting of the following figures:

Figure l is a perspective view of the device, and Fig. 2 is a side elevation thereof in section.

Referring to the drawings, the improved device is illustrated as comprising a unitary cast or forged frame having two

side members

5 and 6 which are connected by a round ed bottom portion. A sheave 7 is mounted between the

side members

5 and 6 on suitable bushings, and these bushings are loosely mounted on a bolt 8 which is supported by bosses carried by the respective side members. The bolt 8 may have a threaded end and a head portion. The threaded end may engage the boss portion in the side member 6, andthehead portion extends through the boss portion in the side member 5and may be provided with suitable means, such as a tie-wire 9, which passes through perforations in the head and side member 5 to prevent the rotation or dislodgment of the bolt. A pin 10 extending through the boss in the side member 5 engages a collar upon which the sheave bearing turns, and prevents rotation of the collar. The bushings may be self-lubricating to permit the free and smooth rotation of the sheave. The upper portion of the side member 5 extends above the sheave 7 and terminates in a suspension ring portion 11. This upper p'ortignis' slightly off-set with respect to the remainder of the side n'ieinber 5' to; p'rov 'de'a proper balance for the snatch-block when it is suspended. A pocket or recess' i2- is and suffici'en't clearance is' rovided between" these elements to pennit a cable! to be readily positionedti'n the groove of said" sheave. The hook terminates in a. somewhat rounded point or tongue 17 which partly enters th'e' rec or pocket 12 so that a" restricted throat-wa y is formed at one side of the sheave. The widtha-nd position of this throat-way issuch that in order to introduce the ropex r cable 19' to be used with the snatch-block it must b''be 'it into the form" of a short loop. This loop portion is inserted between the end of t'he'tong-iie portion 17 and H the walls comprising the pocket 12,."and is placed in position in the groove of the sheave. hen the loop is straightened out, as when the rope or cable is under tension, it is not possible for it to become accidentally dislodged from the groove in the snatch-block. Any slackening of the rope or cable 19 will cause it to strike against, the inner wall of the hook portion and be prevented thereby from becoming disengaged from the snatch-block. Tension is released from the cablewhen it is desired to remove it from the block, and similarly to its manner of introduction, the cable is bent into a short loop and withdrawn.

The

side members

5 and 6 may be reenforced by integral ribs 18 which extend outwardly along the marginal edges of the side members and their bottom portion.

What is claimed is:

1. A snatch-block including a frame having two side members, one of which has a pocketand the other of which has a hook portion spaced from the pocket forming a throat- Way, and a sheave rotatably mounted between said members, said sheave being positioned directly under the hook portion so that it lies in a plane at one side of said throat-way.

2. A snatch-block having a frame including two side members, a sheave rotatably mounted between the side members, one of the side members having a pocket and the othermember having a hook portion extending over said sheave and part way into said pocket.

3. A snatch-block having a frame including two side members, a sheave rotatably mounted between said members, one of the side members having a pocket and the other member having an areuate-shaped hook portion covering said sheave and extending part way into said pocket.

4. A snatch-block comprising a frame including two side members, a sheave rotatably mounted between said side members, one of said members having a pocket and the other member having an arcuate-shaped hook portion covering said sheave and projecting part way into said pocket of the first mentioned member to form a throatway, said sheave lying in a plane at one side of the throat-way.

5. A snatch-block having a frame includmounted between the side members, one of the side members having a pocket and the otherside member having a hook portion covering the sheave and projecting part way into the pocket of the first mentioned side member torform a throat-way, said throatway being so formed to admit a portion of a cable bent into aloop and to prevent accidental dislodgment of said cable when straightened.

In testimony whereof, I have signed my name to this specification this 23rd day of May, 1930.

TEMPLE C. SMITH.