US1309361A - Planoukaph co - Google Patents

Description

K. KNUDSEN.

SWITCH LOCK.

APPLICATION FILED Nov. 11. 1918.

1 ,309, 36 1 a Patented July 8, 1919.

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UNITED STATES PATENT OFFICE.

KNUD KNUDSEN, OF PLAINVILLE, CONNECTICUT, ASSIGNOR TO THE TRUMBULL ELECTRIC MANUFACTURING COLEIANY, OF PLAINVILLE, CONNECTICUT, A

CORPORATION OF CONNECTICUT.

SWITCH-LOCK.

AppIication filed November 11, 1918.

To all whomt may concern:

Be it known that I, KNUI) KNUnsnN, subject of the King of Denmark, (signified intention and taken out first papers and have applied for second papers,) residing at Plainville, Connecticut, have invented a new and useful Switch-Lock, of which the following is a specification.

The objects of this invention are to provide a simple and effective lock construction for securing an electric switch in a predetermined position. Briefly, the invention resides in the combination with the movable element of the switch and the operating member therefor, of a stop carried by the operating member, and a relatively stationary stop disposed to one side of the path of movement of the first stop so as not to be engaged thereby in the normal movement of the switch operating member, with a locking device detachably engageable with one of the stops and arranged to block the movement of one stop past the other.

Another feature of the invention is a guard for preventing the disengagement of the locking device from the stop with which it is engaged.

Other features of the invention will appear as the specification proceeds.

In the accompanying drawing, I have illustrated the invention embodied in a practical commercial form, but as this illustration is primarily for the purposes of disclosure, it will be understood that various changes and modifications may be made without departing from the true spirit and scope of the invention as expressed in the appended claims.

In said drawing:

Figure 1, is a front view of a switch of the so-called inclosed or safety type, the switch parts appearing locked in the open circuit position, a portion of the locking mechanism being shown as broken away and in section.

Fig. 2, is a broken side view 01 the same.

Fig. 3, is a detail perspective View of the locking parts.

In the switch disclosed, the movable switch element is in the form of a plurality of pivoted switch blades 5 adapted to engage the contact clips 6, and the switch operating member is in the form of a pivoted handle 7 connected with the movable switch element Specification of Letters Patent.

Patented July 8, 1919.

Serial No. 262,038.

through the medium of an arm 8 and connections therefrom.

The particular switch here shown is tensioned 111 a switch opening direction by means of a switch opening spring 9 connected with the arm 8, and provision is made for securing the switch in the closed circuit position, said latter means taking the form of a latch 10.

The stop mechanism consists of an outstanding stop pin 11 on the inner side of the switch handle, and a relatively stationary stop pin 12 disposed to one side of the path of movement of the handle carried pin so as not to be engaged thereby in the normal movement of the switch operating handle. The stationary stop 12 is shown mounted on the side of the box 13 inclosing the switch parts, and the two stops are relatively positioned so that one will just about clear the other, as indicated.

The actual locking is accomplished by engaging a locking device with one of the stops which will serve to block the movement of one stop past the other. This locking device I have shown in the form of a padlock 14- of a size and construction such that when engaged with one of the stops, usually the stop on the handle, it will positively block the movement of the one stop past the other and thus serve to effectively lock the switch, or if desired, the hasp of the padlock may be engaged over both of the stops.

To prevent accidental or surreptitious nisengagement of this locking device from the stop with which it is engaged, I have provided a guard 15 having an arcnate groove 16 therein receiving the end of the handle carried pin 11 and serving as a keeper therefor.

In the oil position of the switch the handle carried pin rests in the closed end of the keeper slot, and disengagement of the padlock is therefore ei'l ectively guarded against. In the particular switch shown, the pin on the handle serves a double function in that it provides a hold for the latch 10 as well as one member of the stop mechanism.

I claim 1. In an electric switch, the combination with the movable switch element and an operating member therefor, of switch locking means comprising a relatively stationary stop, a stop carried by the operating member in position to pass the stationary stop in the movement of the switch operating member ancLa padlock engageable with one of said stops to block the movement of one stop past the other.

2. In a switch of the character described, the combination with the movable switch element and an operating member therefor, of a relatively stationary stop, a stop carried by the operating member in position to pass the stationary stop in the normal movement of the switch operating member, a locking device engageable with one of said stops to block the movement of one stop past the other and a guard for preventing disengagement of said locking device from the stop with which it is engaged.

In an electric switch, the combination with the movable switch element and an operating handle therefor, of an outstanding stop pin carried by said handle, a relatively stationary stop pin standing to one side of the path of movement of the handle carried pin, and a locking device engageable wit-h the stop pins to prevent the operation of the switch.

#l. In an electric switch, the combination with the movable switch element and a pivoted operating handle therefor, of an outstanding stop pin carried by said handle, a relatively stationary stop pin standing to one side of the path of movement of the handle carried pin, a locking device engageable over one of said stop pins to block the movement of the one stop pin past the other and a guard overlying the end of the stop pin with which the locking device is e11- gaged to prevent disengagement of said locking device therefrom.

5. In an electric switch the combination with the movable switch element and a pivoted operating handle therefor, of an outstanding stop pin carried by said handle, a relatively stationary stop pin standing to one side of the path of movement of the handle carried pin, a relatively stationary guard having a groove therein receiving the end of the handle carried pin, and a locking device engageable over said pin to block the movement of such pin past the relatively stationary pin.

6. In a switch of the character described, the combination of a'movable switch element, a pivoted operating handle therefor, an outstanding pin carried by said handle, a latch engageable with said pin to hold the handle in one position, a relatively stationary stop pin disposed to one side of the path of movement of the handle carried pin and at a point adjacent the end of movement of the handle in the opposite direction, and a locking device engageable with one of the pins to block the movement of the handle carried pin past the relatively stationary pin.

KNUD KNUDSEN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G.

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