US2693510A

US2693510A - Condenser discharger switch

Info

Publication number: US2693510A
Application number: US308014A
Authority: US
Inventors: Walter C Luebking; Robert J Owen
Original assignee: Collins Radio Co
Current assignee: Collins Radio Co
Priority date: 1952-09-05
Filing date: 1952-09-05
Publication date: 1954-11-02
Anticipated expiration: 1971-11-02

Description

Nov. 2, 1954 w. c. LUEBKING ET AL 2,693,510

l CONDENSER DISCHARGER SWITCH Filed Sept. 5, 1952 Arr 04P/vir United States Patent CONDENSER DISCHARGER SWITCH Walter C. Lnebking and Robert J. Owen, Cedar Rapids, Iowa, assignors to Collins Radio Company, Cedar Rapids, Iowa, a corporation of Iowa Application September 5, 1952, Serial No. 308,014

2 Claims. (Cl. 20D- 16) This invention relates in general to discharging devices and in particular to a safety mechanism for preventing accidental electrical shock.

It is an object of this invention to provide a safety device for removing the charge on condensers when a chassis is removed from its mounting.

It is an object of this invention to provide an automatic discharge device which will assure the discharge of condensers when a chassis is removed from its mounting.

Further objects, features and advantages of the invention will become apparent from the following description and claims when considered in view of the drawings, in which:

Figure 1 is a side view of the discharge device of this invention,

Figure 2 is atop view of the apparatus of this invention. 2 Figure 3 is a sectional view taken on line 3 3 of Figure and Figure 4 is a schematic illustrating the shorting device in a particular discharge circuit.

Figure 1 discloses a plate 10 which might, for example, be a mounting plate upon which one end of a chassis 11 is supported by an arm 12. The chassis 11 might carry thereon, for example, a communication receiver or transmittel or other electrical device which contains high voltage condensers that are dangerous to personnel.

Mounted to the chassis plate 11 are three insulating stand-offs 13 which are held by bolts 14 or other suitable means. A conducting plate 15 is triangular in shape and is attached to the stand-offs 13 by bolts or other suitable means.

Smaller ceramic stand-offs 16 are connected to the stand-offs 13 and have their opposite ends connected to a ceramic plate 17 which is connected to the stand-offs 16 by bolts or other suitable holding means.

The conducting plate 15 has a pin 18 that extends downwardly therefrom, as best shown in the sectional view of Figure 3. A plate of conducting material 19 is formed with an opening and is received over the pin 18. An actuating member 20 is attached to the plate 19 and fits over the pin 18.

A spring 21 is mounted between the plate 15 and the plate 19 and pushes them apart. A plurality of contacts 22 are mounted in the insulating plate 17 and are engageable by the plate 19 when the discharge device is in the up positon, as shown in Figure 3.

Figure 4 discloses the discharge device wherein, by way of example, three condensers C1, C2 and C3 have one of their sides connected, respectively, to one of the contacts 22 and their opposite sides connected to the plate 15. When the plunger 20 is pushed upwardly the plate 19 is out of engagement with the contacts 22 and the condensers C1, Cz and C3 are effective.

However, when the chassis is raised relative to the supporting plate 10, the plate 19 is allowed to engage the contacts 22 and thus completes the electrical circuit from the plate 15 to the plate 19 through the pin 18 and the spring 21 to short out the condensers.

In operation, whenever the plunger 20 is in the position shown in Figure l, the condensers are not shorted and the circuit in which they are mounted will operate in the conventional manner.

However, when the chassis is moved relative to its mounting plate, the plunger 20 will fall downwardly, thus allowing the plate 19 to short the terminals 22, thus discharging the condensers.

lt is seen that this invention protecting personnel.

Although the invention has been described with respect to a particular embodiment thereof, it is not to be so limited, as changes and modifications may be made therein which are within the full intended scope of the invention, as defined by the appended claims.

We claim:

1. A switch comprising, a chassis, a plurality of insulating stand-offs connected to said chassis, a first transverse plate attached to said stand-offs intermediate their ends, a pin attached to said first transverse plate, an actuating plunger receivable on said pin, a second plate of conducting material attached to said plunger, a third transverse plate of insulating material attached to the ends of said stand-offs, a plurality of contacts mounted in said insulating plate, said second plate supported between said first and third plates and engageable with said contacts, a spring mounted between said first and second plates to bias the plunger downwardly, an arm attached to said chassis, and the end of said plunger extending below said arm so as to disconnect the switch when the chassis is resting on a fiat surface and to connect it when the chassis is lifted above the fiat surface.

2. A safety switch for discharging condensers in a radio chassis comprising, a plurality of insulating stand-offs attached to said chassis and extending downwardly therefrom, a first transverse plate mounted between said standofis intermediate their ends, a pin attached to said first transverse plate, an actuating plunger received over said pin, a second transverse conducting plate attached to said plunger, a third insulated plate connected to the ends of said stand-offs, a plurality of contacts mounted in said insulated plate and engageable with said second transverse plate, a spring means between the first and second transverse plates to bias the plunger downwardly, a downwardly extending arm attached to said chassis and of a length so that when the chassis is resting on a flat surface the second plate is moved out of engagement with the contacts and when the chassis is lifted from the fiat surface the second plate is allowed to move downwardly into engagement with the contacts.

provides a safety device for References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,862,928 Gebhard June 14, 1932 1,865,237 Danuff June 28, 1932 1,928,691 Huddleson Oct. 3, 1933 2,144,873 Dimond May 4, 1939 2,165,025 Baldwin, Ir. July 4, 1939 2,312,243 Evans et al. Feb. 23, 1943