US931355A - Trolley-clamp. - Google Patents

Description

T. VARNEY. TROLLEY CLAMP. APPLIOATION PILEUMAY s 1907.

Patented A'ug.17, 1909.

WITNESSES:

aZZ 'wIio m it may concern: Be it known that I, THEODORE VA-RNEY, a

c iti'zenofthe United States, and a resident of Pittslourg, in the county of Allegheny and State of Pennsylvania, hare inventeda new "and; useful Im 'rovement in Trolley-Clamps,

of which the, ollowing is a specification.

My invention relates 'to ineansfor snsipending electric line conductors, and has special reference tosuch means as ai efadaptedfor use with a catenary form of trolley line suspension and are commonly known trolley clamps.

I The object of my invention is to provide an' improved clamping device'for securing other purposes, grooved conductors are often ment with the trolley conductor.

employed and, in such cases, trolley clamps are often utilized winch comprisesuitable jaws and means for holding them in engageclamping devices have almostinvariably been adapted for assembling as they were applied to the line so that the time required for making the installation was unduly prolonged.

1 According to my present invention, employ a trolley clamp which is especially simple and may preferably be completely assembled before it is shipped from the factory. A very short time is thus required to secure the clamp to-the conductor in a rigid and permanent manner.

Figure 1 of the accompanying drawings is a sectional elevation of a trolley line embodying my improved clamping device, gs. 2, 3 and 4 are detail views of the clamping device shown in Fig. l, and Fig. 5 is a dia grammatic view of a portion of an electric line in which a well known cat-e cry form of suspension is'employed.

Referring to the drawings, a grooved trolley conductor 1 is suspended from a messenger cable 2 by means ofhanger rods 3 each of which is secured to the formerby means of atrolley clamp L and to the latter by a cable clamp 5. The cable clamp may be of-any suitable construction, such as that illustrated in Fig- 1, which comprises a loop 6 surrounding the cable 2 and provided with two ears 7, the upper extremity of the rod 3 TROLLEY-CLAMP;

Specification of Letters Fatent.

Applicationfiled lay 6,1907. Serial No. 372",165.'Q

These 1'11 EODORE wa ver, or prrgrssnae, PENNSYLVANIA, assten'on TO ivnsrinonoiisnnrnernic & MANUFACTURING eoMPAnr; A COBPOR-ATIONOF PENNsrLv NI j retreat d Aug. 17, 19cc.

being-secured between the ears by means of a'bolt 7 1 The trolley clamp comprises interchangeable clamping .jawsS and a cup 9, having tapering inner walls at one end which form a substantially frnsto-conical chamber 10,

a tapped hole 11 being provided in the base wall of the chamber to receive one extremity of the hanger rod 3. The clamping jaws 8 are provided with expanded shanks 12 Which, when assembled, form'a frnstoconical head that is adjustable w1tlnn the cup 9. .The jaws are forced together, when'they are crowded'into the smaller part of thechamber 10, by the rod 3 which is pressed against the outer extremities of their shanks. The cup 9 is first formed with substantially cylindrical walls, asshown in Fig. 4 of the drawings, and, after the clamping jaws 8 are so placed that their shanks extend into the cup, the side walls of the cup are forced into the shape which produces the frustoconical chamber 10 illustrated in Fig. 1. This resultmay be accomplished under \81 heavy pressure obtained in a suitabldswaging machine. After the parts are formed and assembled as shown in Fig. 1, it is impossible to remove the jaws from the cup, but a sutlicient adjustment is permitted to allow the hooked portion of the jaws to engage the grooves in the trolley conductor.

'The portion of the aws which engage the trolley conductor may, of course, be adapted for use with conductors of circular crosssection and other i'ariatiinis' in the. size and arrangement of the details of the device may beeifected within the scope of my invention.

l claim as my invention: l. A trolley clamp comprising a cup having end walls and downwardl and inwardly inclined side walls, a pair of jawshaving expanded shanks, the inner end of each of which is larger thanthe maximum opening between the adjacent side wall of the cup and the other shank, and means for forcing the shanks against the side walls of the cup to produce a clam-ping action between the jaws. I

2. A trolley clamp comprising a cuphaving end walls and downwardly and inwardly tapering side walls, a pair of jaws having flaring shanks the ends of which are located in'the cup and each of which is larger than the maximum opening between the adjacent.

side wall of the cup and the other shank,

and ineans for producing a clamping action between the jaws. v

3. A trolley clamp comprising a cup having end walls and downwardly and inwardly tapering sidewalls, a pair of jaws having flaring shanks the ends of which are located in the cupvand each of which is larger than the maximum opening between the adjacent side wall of the cup and the other shank,-

anda hanger rod adapted to both force the jaws together and to suspend the cup.

5. A trolley clamp comprising acup having end walls and downwardly and inwardly tapering side walls, a pair of jaws having hooked projections, flarin shanks integral therewith the ends of which are located in the cup and eacli'of which is larger than the maximum opening between the adjacent side will of the cup and theother-shank, and a hanger rod which is screw-threaded into the base wall of the: outer ends of the shanks. v

6. The combination with a trolley co'n ductor and a trolley clamp comprising a cup having end walls and downwardly and in wardly tapering side walls, a pair of jaws having hooked projections to engage the trolley conductor, flaring shanks integral with said projections which are located, in

the cup and each of which is larger than the maximum opening between the adjacent side wall of the cup'and the othertshank, and a iippa-nd engages the hanger rod the lower end of which is screw- I threaded into the base wall of the cup and engages the outer ends of the shanks, of a-n'iessenger cable. and a messenger cable clamp detachably fastened to the upper end of said hanger rod.

In testimony whereof, I have hereunto subscribed my name this 30th day of April,

' THEODORE VARNEY.

Witnesses: I

E; E. Rosa, BIRNEY HINEs.

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