US2038353A

US2038353A - Generator terminal shield

Info

Publication number: US2038353A
Application number: US14973A
Authority: US
Inventors: Frank G Gardner; Conrad G Merrill
Original assignee: Breeze Corp Inc
Current assignee: Breeze Corp Inc
Priority date: 1935-04-06
Filing date: 1935-04-06
Publication date: 1936-04-21
Anticipated expiration: 1953-04-21

Description

F. G. GARDNER ET-AL 2,038,353 l E GENERATOR TERMINAL SHIELD April 2l, 1936.

Filed April 6, 1935 INVENTORS ATTORNEY v Patented Apr. 21, 1936 UNITED STATES 2,038,353 GENERATOR TERMINAL SHIELD Frank G. Gardner and Conrad G. Merrill, Newark, N. J., assignors to Breeze Corporations, Inc., Newark, N. J., a corporation of New Jersey Application April 6, 1935, Serial No. 4174,973

4 Claims.

This invention relates to shields for the terminals of electrical devices.

Where radio is used in close proximity to an internal combustion engine or under circumstances wh'ere current is flowing through an electrical system, interference with the radio equip,-

ment is experienced. This is caused by the ema- .nation of electrical impulses from the devices or wires carrying the current. In 'order to avoid such interference it is necessary to surround `the electrical conductors and. the various electrical devices with conductive housings which will prompt lydissipate such emanations to ground. In connection with the use of radio in the vicinity of an internal combustion engine, and particularly in aircraft practice, it is necessary to shield the entire ignition system, including its auxiliary units to avoid interferencr The object of this invention is to provide a simple, eiective and easily installed radio shield for the terminal of an electrical unit, and particularly the terminal of the common form of generator used on aircraft.

A further object of the invention is to provide.

change in the structure or assembly of the generator, and which will provide means to co-opf erate with other shielding elements which shield the conductor leading to the generator.

Under normal conditions the casing of the generator proper is of metal and is grounded so that it is only necessary to shield the terminal' of the generator completely to shield this unit. However, it is, frequently desirable to use a condenser with the generator. Therefore, a further object of the invention is to provide a radio shield'for theterminal of the generator with which shield a condenser may be used. Al further object of the invention is to provide a condenser of such construction that it maybe readily applied to the shield without change in the structure of the shield.

The invention consists of the construction,y

the parts forming the invention herein, and in which:

-an annular bead I 6.

Figure 1 is a vertical section, partly in elevation, showing the application of the shield to the /t'erminal of the generator; and,

Figure 2 is a vertical section, partly in elevation, showing the application of the condenser to the generator and shield. 5

Referring to the drawing, A designates the casing of a generator which is provided with the usual terminal B having a threaded binding post C. 'Ihe post C is adapted to receive a metal contact tip D of the insulated conductor E.

Surrounding the terminal B is an open-ended tubular metallic shield 3 having an i'nturned flange 4 formed at the bottom thereof. The flange 4 is curved to conform'to the contour of the generator A. The upper end of the tubular 15 member 3 is formed with a screw-threaded neck 5 which is normally closed byY a disc 8 resting on the neck 5, and the disc 6 is held` securely in position by means of a coupling nut 1.

In order to hold the member 3 on the gener- 20 ator A, a composition or other washer 8 is disposed around the terminal B. 'Ihe washer 8 is surmounted by a metal Washer 9 and a nut IIJ is applied on the post C to force the washers 8 and 9 against the ange 4, which in turn is 25 forced against the generator A, thus holding the tubular member 3 rigidly in position on the generator A.

In the assembly of the device the nut 'I and the disc 6 are removed so that a socket wrench or 30` other tool may be inserted through the open top of the member 3 to secure the nut III in position.

The contact tip D is then applied to the post C and a second nut II is applied to the post 35 C to securely hold the contact member D.

The tubular member 3 is provided with a substantially tubular lateral extension I2 terminating in a threaded neck I3 adapted to receive the coupling nut G of a* shieldingconduit F. 40 The conductor E extends through the extension I2 and the conduit F.

Referring to Figure 2, I4 designates a condenser, the metal casing of which forms one con# tact and the'opposite contact is in the form of a 45 coil spring I5. The condenser I4 is formed with When it is desired to use the condenser I4., the nut 'lis removed and the dis'c 6 is discarded. The condenser lI4is of such size that it lmay be entered in the upper end of the tubular member 3 and the bead I6 ywill rest on the upper edge of the neck 5. The nutV 'I is then applied over the condenser I 4 and tightened on the neck 5 to hold the condenser securely in position. The spring I5. is compressedagainst casing of the condenser Il is grounded through the tubular member i and the generator A.

From the foregoing it will be seen that with the construction, shown in Figure 1 a complete shield is provided for the terminal of the generator. As shown in Figure 2 the shield readily lends itseli'to the use therewith of acondenser and the condenser is entirely shielded. 1

Having thus fully described the invention, what is claimed as new and desired to be secured by Letters Patent is:

1. In combination with a generator terminal and a radio shield therefor, a tubular condenserr formed with an annular bead and a spring contact, said spring contact being shielded by the terminal shielding means.

2. A radio shield for the terminal of a generator comprising an open-ended. Substantially* tubular member surrounding the terminal, an ntemal flange formed on the lower edge of the member and in contact with the generator, a washer surrounding the terminal and bearing against the flange, a nut on the terminal to hold the shield in position, a disc disposed on the upper end of the open-ended member, a remov- 2,038,353 `the post C to make contact therewith, and the able coupling nut to hold the disc in position and a lateral extension on the tubular member.

3. A radio shield for the terminal of a generator comprising a. tubular member surrounding the terminal and extending past the upper end thereof, means carried by the terminal to hold the tubular member in position, a condenser disposed in the upper end of the tubular member, said condenser having a spring contact in contact with the terminal, an annular bead on the condenser resting on the upper end of the tubular member, means to hold the condenser in position and a lateral extension on the tubular member to admit the insertion o1' a conductor.

4. In combination with a generator terminal and a radio shield therefor, a tubular condenser formed with an annular bead, said condenser having a metal casing grounded to the shield and a spring insulated from the casing, said casing forming one contact'of the condenser and said spring forming a second Contact, the ungrounded portion of the condenser being shielded by the terminal shielding means.

FRANK G. GARDNER. CONRAD G. MERRILL.