US1775147A - Klectric switch - Google Patents

Description

ELECTRIC SWITCH iled Jan.

Patented sera. 9, 1930 UNITED STAT-Es PATENT oFFlcl-:

. JOHN B. TmCOTT, OF ST. LOUIS COUNTY, MISSOU'BI, ASSIGNOR T0 JAMES B. XEABNEY CORPORATION, OF ST. LOUIS. MISSOURI, A CORPORATION F MISSOURI nmcrmc swrrcn Appueaaon mea January a, 192s. serial no.7s,ss1.

M v invention relates to a new and useful improvement in switches and more particue come released upon backward movement -of v common to high tension switches.

the switch blade. v

, A still further object is to provide a control handle that throws lpast a dead center, one side `of which when the switch is closed tends to further close the switch by the weight of the parts and the other side of whichtends to hold the switch vopen b v supporting the same weight. l

- With the foregoing and other objects 1n view, my invention consists in certain novel features of construction and arrangement of parts, hereinafter more fully described and claimed. and illustrated in the accompanying drawings, in which Figure 1 is a side view of mv improved high tension switch and controlling handle.

Figure 2 isa top view of the contacting elements in engagedposition.

Figure 3 is an enlarged side viewof the contacting elements.

The numeral 1 in the drawings indicates a switch supporting frame on which is mounted a stationary insulator pin :2. Journal 3 is also mounted on frame 1 and carries a rotatable insulator pin 4. Mounted on the top of rotatable insulator pin' is an ordinary knife blade contacting element 5 of the type The blade receiving switch element 6 is mounted on the stationary insulator pin bv means of` an ordinary bracket 7. This memberhas a comparativelv heavy base 8 in -which are fixed receiving blades 9 which blades 9 are normallv spaced slightly: closer' together than the thickness of blade 5 land have their free ends flared to insure its proper introduction.

Lugs 10 and 11 which are formed with base 8 project parallel to and outside of the receiving blades 9. Bell cranks 1:2 and 13 are ulcrumed by pins in the outer ends of lugs 10 and 11 and terminate in flared feet 14 and adjacent to the outer ends of receiving blades 9. l The opposite ends 16 and 1T of the hell cranks pass through openings 18 and 19 in the receiving blades 9 and termi-` nate in the path of the movable blade element 5.

The rotatable insulator pin 4 carries an arm :20. Pivotallv connected to arm 20 is a length of pipe 21. The length of this pipe varies according to the particular installa.- tion but is normally from five to twenty feet long` and it can'be readily seen thatvsuch a weight could easily actuate the switch where provision is not made to prevent it.

Bracket is located on the pole at the desired point and carries a bell crank'switch actuating handle :23. The lower end of pipe 21 is connected to arm 24 of the actuating handle. W'hen theswitch is closed, as shown b v the full lines in Figure 1, theweight of thefpipe 21 is so directed that it tends to further close the switch. There is no limit to the closing movement of the switch throughout the controlling handle er actuat ing mechanism.' When the switch is open as shown by the dotted lines in Figure 1 the weightof pipe 21 is directed to the other side of the axis of the handle and a stop '25 prevents excessive motion of the handle in thisdirech'on.

In thel operation of niv improved high tension switch. the movable blade 5 enters between the spaced receiving blades9. Since the blades 9 are slightlv closer together than the thickness of blade blades 9`spread and tend to contact only with the entering edge of blade 5. yThis condition exists until bla e 5 contacts with 'the arms 16 and 17 of the bell cranks 12 and'13 when the driving force of blade 5 clamps the outer ends of the spaced contacts 9 against 'the blade 5 through the medium of feet 14 and 15 of these bell cranks.

The clamping action of the bell cranks arrests the forward motion of the blade 5 and prnvides a contact along the full surface of blade 5 within blades 9 as shown in Figure 2.

It will be readily seen that the force with which blade 5 strikes the arms 16 and 17 of of said stationary contact against said movi bell cranks 1 2 and 13 governs the tightness of able contact and establish a full length conl crank having an arm projecting through said the connection between blades 9 and blade 5. A very slight backward movement of blade 5 releases bell cranks 12 and 13 and freely permits its full withdrawal.

It will be readily understood that minor changes in the size, form and construction of the various parts of my improved switchA may be made and substituted for those herein shown and described, without departing rom the spirit of my invention, as expressed in the appended claims.

I claim:

1. An electric switch comprising, spaced receiving contacting lfelements, bell cranks mounted exteriorly of and each having an arm projecting through the said contacting elements and an arm adjacent to the -free end of one of said spaced elements, and a single contact blade adapted to enter between said spaced contacts and clamp their extremities by actuating said bell cranks, said clamping action forming a full length connection.

2. In an electric switch including a movable contact element and a stationary contact element adapted for engagement, a bell stationary contact for engagement by said,Y movable contact and its other arm bearing against the outer side of said stationary contact for clamping said contacts together actuated by their engaging movement andreleased by the initial disengaging movement.

3. In an electric switch including a movable .contact element and a stationary contact element adapted for-engagement, a -bell crank `mounted adjacent to and having an arm projecting through said stationary contact for engagement by said movable contact, said bell crank being adapted to c-lamp said contacts together to eil'ect full length connection be- Ltween said contacts upon actuation by said movable contract.

nection.

In testimony whereof I hereunto aiix my 4; In an electric switch including a mov- A' able contact element and a stationary contact element adapted for engagement, bell cranks mounted adjacent to said stationary contact and each having an arm projecting therethrough for actuation b-y said movable contact, said bell cranks being adapted to clamp said contacts together upon engagement of said arm, and release said contacts upon slight disengaging movement. 5. In an electric switch, a stationary contact comprising a pair of lrelatively iiexible members,each having a free end,a relatively rigid movable Contact adapted to enter between said stationary contact members, a bell crank adjacent each stationary contact member and having-an arm projecting therethrough and a foot bearing against the free end, said bell crank arms beingin the path of travel of said movable Contact and adapted @5 for actuation'thereby to-clamp thefree' ends JOHN B. TRESCOTT.

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