US958554A - Pull-socket. - Google Patents

Description

W. SL'ABY. PULL SOCKET. APPLICATION FILED APE. 2'4, 1909.

Patented May w,v 19w.

YINVENT'OR ATTORNEYS [UNI D STATES Paris's cri ics.

FRANK w. SLADY, or BRIDGEPQRT, CONNECTICUT, nests-nos TO THE BRYANT sane TRIS COMPANY, or samosroar, connscrronr, a CORPORATION or coimsc'rrcur PULL-SOCKET.

To all whom it may concern:

Be it known that I, FRANK V. Smnr, a citizen of the United States of America, and residing at Bridgeport, in the county of Fairfield andState of Connecticut, have invented a certain new and useful Improveinent in Pull-Sockets, of which the tollowinglis a specification. vx y mventiomrelates to pull sockets for incandescent lamps and more particularly to certain details 0t construction hereafter re'- ferred to, the. object of my invention being toprovide an improved constructioni such details; r

In the accompanying drawings, Figure l '-is a side elevation partlyin'section oi, said socket; Fig. Q'is a Inn of the same with the top button remove Fig. 8 is a perspective of the spring tensioning device, parts detached and drawn to a larger scale; F 4

' is asimilar View of the same partially broken away, with the parts assembled; Fig. 5 is a similar view of the chain carrier parts; and Fig. 6 is a. similar view of the rotary switch member and its carrier dctached; Fig. T'i's a side elevation of the socket drawn to a smaller scale; Fig. 8 is a longitudinal section; and Fig. 9 is a partial plan of a chain carrier of modified form.

The socket illustrated is of the type shown in the Platt Patent 716,578 and in the copending application Goodridge 467,619, and comprises upper and lower msulating buttons A and spaced apart by standards a,

I) aud o, of which the first two serve as binding posts, while the last mentioned carries the chain guide and the tensioning device for the ratchet spring as will be more fully described hereafter. The leadingin wires may be secured to the standards a and b by means of the binding screws m and n and the lamp circuit completed through the-spring contact a; on the standard a cooporating with the rotary switch piece S to be more fully described. The latter operated by means ofa chain (3 which, assing through the chain giliide 10,- is secure to the actuating ratchet member 11 through the chain carrier 1.? fast thereon.

It has been fiound that the rotary switch member of the type generally in. use in switches of this character is notwholly satisfactory, since ,in the course of time the Specification of Letters Patent. Patggnfigd E13, 1'? 1910,

Application filed April 24, 1909. Serial No. 492,916.

parting edges of the two contact members the rotary switch piece S, the body of which is of insulating material as is customary, with a cu rrent carrying band 5, the contact Wings 8 of which are of spring metal and are formed so as to normally spring out from the teeth 8 above which they lie;

Upon one movement of the ratchet, the piece [S is partially rotated. the coiuact wing s is pressed against the tooth s by the spring contact a: and the lamp circuit is completed. As the piece S is again partially rotated by the ratchet and the contact reaches the end of the tooth s, the contact wing s is freed. and, flies outward while the spring contact :12 drops inward to the base of the tooth. The contact is thus not only sharply broken, but the distance between the current carrying members is about twice that usually obtained.

The danger of arcing through accuinulation of dust is minimized bythe insulating air space which separates the contact wing s from the tooth -8 on the switch piece S.

will benoted that iii bending up the wings .9 into position over the circumferential teeth s on the switch piece S, a preliunnary bend in the opposite direction isimparted' at 0 so that the angle of curvature need not be made so sharp as heretofore customary. This materially lessens the percentage of breakage now incidental to the usual inethodj member 13, socketed on the end of the switch spindle and provided with dowir As an improved detail of manufacture it" 'wardly extending lugsfll i against any one or more of which the up rend of the actuatin spring 15 abuts. slot 16 in the head of t e abutmentmember affords means for rotating the same by a screw diiverfor instance. A friction bearing 17 for'the member 13, suihcient. to hold the latter in any position to which it may" be adjusted, is afforded by means of an arm 18 of s rin metal referably integral with the sta'ndar sai arm being sp adords additional frictional surface. The member 13, which is of greater diameter than the normal diameter of the bearing, is inserted by spreading the split ends of the arm 18. CollarsQOand 21 above and below the bearing prevent the abutment'member 13 from: being pushed out of its bearing in either direction the collar 20 bein formed after the parts have been assemble An improved constructionofthe ratchet and chain rail is also shown. Heretofore it has been customary to form the chain rail either integral with the ratchet as described in the Platt patent above mentioned, or in two pieces joined together'at right angles and subsequently united to the ratchet member. The latter is the prevailing method since it has been found practically impossible to manufacture the parts from a single blank, the percentage of breakageand imperfect pieces being too l'iigh. I have found however that the chain rail proper 22 may be 'formed from a. single blank, by suitably rolling the same. If the blank be provided with lugs and corresponding perform 'tions 24% be formed in the wing 25 of the ratchet 11, the rail may be'readily attached by merely passing the lugs 23 therethrough and spreading their ends. This is quite a saving over the three-piece process, since but two blanks are formed for both ratchet and chain rail and the rolling of the latter into desired. form is extremely simple. An-

-othcr improvement in the chain rail is shown in Figs-8 and i) and comprises a modification of the common claw .12 shown in. Fig. 5. By substituting for the latter a tongue 1-2 perforated and slotted zit-12 to permit the insertion of a chain ball and bending the endoi the tongue around beneath the slot I prevent the insertion of more than the terminal ball of the chain;

This eliminates the podsible danger of a dangling chain end within the interior of the socket. 3

To prevent the possibility of the chain carrier jumping out of the runway 28 in which its lu 26 works and causing a short circuit by coming in"contact with the-terminal a. I provide a shoulder 27 on the upper insulating button which extends downward .a suiiicient distance to depress the chain carrier and bring the lug26 back into the runway 28 in case it should have been lifted out through any accident.

It will be readily understood that the'preit at the bearing end. and provided with a split collar 19 Whichemcee be varied without departing from mv 1nvention and I do not limit myself to the details as shown. I

I claim as my invention:

'1. In an electric switch mechanism, a ratchet member, a spring tending to turn the same in one direction, and a tensioning device for said spring,.comprising an abut ment memberengaged by one end of said spring and a frictional collar forming a bearing for said abutment piece and holding the latter in any position to which it may be adjusted by merely rotating the same.

2. In an electric switch" mechanism, a ratchet member,' a spring tending to turn thesame inone direction,-' and a tcnsioning device for said spring, comprising an abutment member engaged by'one-end oi. said spring and asplit frictional collar forming a bearing forsaid abutment piece and holding the latter in any position to which it may beadjusted by merely rotating the same.

3. In an electric switch mechanism, a ratchet memberfa spring tending to turn the samein one direction, and a tensioining device for said spring, comprising an abutinent member engaged by one end oi said spring and a frictional collar forming a bearing for said abutment piece, said abutment being ofi'set above and below said collar to prevent axial displacement. 4. In 'a pull socketea stationary spring terminal and a coiiperating rotary switch member comprising a non-copductlng body and conducting spring contact wings rotating therewith.

5. In a pull socket a stationary spring terminal and a rotary switch member 00- operating therewith, said' switch member comprising a non-conducting body with circumferential teeth'formed therein and con ducting spring wings lying circuinferentially above certain of said teeth and substantially co-terminous therewith.

(3. In an electric switch, a rotary switch member comprising anon-conducting body provided with circumferential teeth and a 'condmiting member movable therewith, the

latter forming a plate lyihg against a face ol said. body with wings angled over certain of said circuin'ferential teeth, the said wings being curved away from and then toward said body piece whereby a. curve of relatively great radius is smurcd at the junction of said wings with said body piece, substan tialiy as described. I

7. In an electric switch, a rotaryswitch member comprising a non'conducting body -provided with circumferentialL teeth and a conducting member carried thereby, the latter forming a plate lyingagainst ,a face of said-body withcontact wings at right angles thereto rounded over certain of said circum-- ceases between said buttons, a ratchet member to actuatethe same, a. stop in coimectionvnth the lower button to limit the angular movement of said. ratchet and a shoulder on said upper'button to depress said ratchet against -said stop, substantially'as described.

9. In a pull socket, a pair of insulatin buttons, a rotary switch member arrange between said buttons, a ratchet member to actuate the same, a sto in connection with 15 the lower button to limit the angular movement of said ratchetand means carried by the upper button to insure the operation'of said stop.

10. In a pull socket, a chain rail having. 20 means for securing the chain thereto and means in connection therewith-for limiting the length of the chain within the socket,

substantially as described.

11. In a pull socket, a chain rail having means for securing a chain thereto and a tongue arranged with relation to said securmg means to limit the extent of chaln extending into said socket beyond said securing means.

12. in a pull socket, a chain rail having a channel for the body of the chain and an oii'set end slotted to receive and retain a ball of the chain together with a tongue arranged to prevent the insertion of more than a predetermined length of chain through said slot.

13. In a pull socket, a pair of insulating buttons, a switch operating ratchet arranged between said buttons and provided with a stop lug, one of said buttons-being provided with an offset runway in which said lug works, whereby the extent of oscillation of said ratchet is limited, and the other button being provided with a shoulder over said the accidental rise of said

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