US1706805A - Cable grip - Google Patents

Description

March 26, 1929. I Q MOFFITT I 1,706,805

CABLE GRIP Filed July 12, 1928 ATTORNEYS 7 sive.

Patented Mar. 26, 1929.- i

' U I ED TATE v LAMONT ERNEST Momma,

or BROOKLYN, New YORK.

CABLE GRIP.

Application filed luly 12,

This invention relates tocable grips and particularly to a devicefor pulling mult1ple strand cablessuch as are employed as con- I :wedge is forced backwardly to release the,

ductors of electric current, through conduits.

Electric cables consist of two or more strands of conductors enclosed in suitable insulation and surrounded by a metallic sheath- Such cables are heavy and relatively stiff. Considerable difficulty is experienced, there? fore, in pulling the cables through underground conduits and particularly in providing a suitable connection between the cable and the draft mechanism.

So-called basket grips which engage the cable sheath have been tried, but such .devices tend to strip the sheathfrom and thus destroy the cable. Consequently it has been the practice to employ pulling eyes which are sweated to the ends of the conducting strands with solder. The latter operation requires skill and time and is correspondingly expen- It is the objcct'of the present invention to provide a simple and effective grip which is adapted to engage and to securely hold the ends of the multiple strands of the cable and to permit the application of draft thereto. Other objects and advantages of the invention will be understood by reference to the following specification and accompanying drawing, in which Fig. 1 is a longitudinal section through the device, a

Fig. 2 is an end view thereof. Fig. 3 is a section on the line 3.3 of Fig. 1, Fig. 4 is an end view of the wedge, and a Fig. .5 is a view inperspective of a section" of cable with the strands bared for engagement with the device.

The cable grip or draft device embodying the invention comprises a shell having a tapered opening therein and a taperedwedge having grooves'to receivethestrands of the cable. The strands are first bared by removing a portion of the sheathand insulation from. the end of thecable and are then inserted through the smaller end of the, tapered opening through the shell. The wedge is centered between the strandsv and is driven to a tight fit. Thereafter an eye-block is in serted in the larger end of the opening through the shell and is secured by a pin. The eye-block may beconnected to a swivel 7 link through which draft is applied. Owing to the frictional contact betweenthe strands 1 and the "shell and wedge the application of- 192a Sean No. 292,252.

draft wedges thestrands firmlywithin the shellso that they cannotbe separated therefrom until the tension. is relieved and the strands.

The device as described is extremely simple. I

It affords, nevertheless, a firm grip upon the strands of thecable. Itcan be Iattachedand detached quickly, thus savingthe labor which has been incidentalheretofore tothe' use'of pulling eyes of the type usually employed. 1

j The device may be'embodied in Various forms, but the preferred construction isillustrated in the drawing, in which 5, indica-tes a shell of steelor other suitable metal having a tapered opening 6 therein. A wedge 7 is device maybe utilized for pulling cables having any number of strands by substituting suitable wedges. '7 Atits larger end, the'opening 6 in the shell 5 is preferably cylindrical as indicated at 9,

and is adapted to receive an eye-block 10 hav ing an opening therein toreceive a pin 11.

The pin is provided preferably with a groove 12, and a pin 13 is disposed in a suitable openand thus to prevent escape of th'e'pin 11 while the device is in the conduit. Aswivel link (not shown) of usual type may be connected to may besecuredby a cotter 15.

In applying the cable grip,

the eye-block'by means ofa pin 14; which the strands 15 I at the end of the cable 16 are exposed by cutting awaythe sheath 17-and insulation 18. 1 Theeye-block 10 is separated from the shell 5 and the wedge 7 is withdrawn. The hared' ends of the strands are inserted through the sm'allerend of the tapered opening 6 and'the wedge? is centered between the'latter, being disposed "in the-grooves 8. a driven home'and the eye-block 10 is replaced.

The wedge is The device may be connected then to the swivel link and tothe draft mechanism.v Upon the applicationof draft to the device, f

the cable strands are firmly gripped and the,

cable may be drawn through the conduit without danger. of .breaking the connection or strippingfthe sheath from the cable...

The device .aifordsa simple, easily applied and certain connectionbetween the draft mechanism and the cable. It may be connected and disconnected at will with a minimum of effort. It nevertheless avoids the principal difliculties experienced heretofore in drawing cables through conduits.

Various changes may be made in the details of construction and arrangement of the parts Without departing from the invention or sacrificing any of the advantages thereof.

I claim:

1. In a cable grip, the combination of a shell having a bore extending longitudinally therethrough, said bore having one end tapered for the reception of a wedge for maintaining the cable in frictional engagement with the shell and an eye block removably held within the other endof the'boi'e for connection to draft means.

2.111 a cable grip, the combination of a shell having a bore extending longitudinally therethrough said bore having one end tapered for the reception of a Wedge lor maintaining the cable in frictional engagement moeeee 3. In a cable grip, the combination of a.

shell having a bore extending longitudinally therethrough, said bore having one end tapered for the reception of a Wedge for maintaining' the cable in frictional engagement with the end of the shell, a plurality of transverse bores extending through the other end of the shell, an eyeblock in said other end of the longitudinal bore for connection to draft means "and means extending through the transverse bores for removably holding the eye block Within said longitudinal. bore.

In testiinon whereof I al'tix m si nature.

LAMONT nnnns r MOFFITT.

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