US2662151A

US2662151A - Resistor terminal

Info

Publication number: US2662151A
Application number: US265013A
Authority: US
Inventors: Max G Bales
Original assignee: Motors Liquidation Co
Current assignee: Motors Liquidation Co
Priority date: 1952-01-04
Filing date: 1952-01-04
Publication date: 1953-12-08
Anticipated expiration: 1970-12-08

Description

Dec. 8, 1953 5, BALEs 2,662,151

RESISTOR TERMINAL Filed Jan. 4, 1952 INVENTOR. Max G.B.4L.E5 BY 8 gr TOR NE Y5 Patented Dec. 8, 1953 RESISTOR TERMINAL Max G. Bales, Anderson, Ind., assignor to General Motors Corporation, Detroit, Mich., a corporation of Delaware Application January 4, 1952, Serial No. 265,013

3 Claims.

This invention relates to an improved resistor terminal of the kind used in an ignition system for internal combustion engines.

Resistors for use in the primary circuit of the distributor when used with an ignition coil requiring a current limiting resistor should be built into the primary terminal of the distributor and the resistance should be completely enclosed so that it would be difiicult to operate the circuit. Should the resistance unit be a separate item or a part of the ignition coil it is possible to wire around it in such a manner that excessive current would result in the primary circuit and damage the distributor points or the coil.

An aim of the present invention is to provide an improved heavy duty resistor combined with a distributor terminal to form a unitary structure which is mounted in an opening provided in a distributor housing.

Further objects and advantages of the present invention will be apparent from the following description reference being made to the accompanying drawings wherein a preferred embodiment of the present invention is clearly shown.

In the drawing:

Fig. 1 is a wiring diagram illustrating the use of the present invention.

Fig. 2 is a sectional view, on an enlarged scale, taken on line 2-2 of Fig. 1.

Fig. 3 is a sectional view taken on line 3-3 of Fig. 2.

Fig. 4 is a sectional view taken on line 4-4 of Fig. 2, but on a larger scale.

Referring to Fig. 1 a combined primary terminal and resistance unit 25 embodying the present invention is shown in an ignition circuit for an internal combustion engine, 2! designates a battery or other source of current grounded at 22 and connected by a wire 23 to an ignition switch including stationary contacts 24 and 2t and a movable contact 25. The contact 25 is connected by a wire 2? to one end of the primary winding 28 of an ignition coil 30. One end of the secondary winding 29 of the ignition coil is connected to the primary winding while the other end is connected by a wire 3! to the high tension terminal 32 of an ignition distributor 33. The other end of the primary coil 2% is connected by a wire 34 to a terminal 35 of the unit 20. The terminal 35 is connected to a terminal 36 through a resistance element 31. Terminal 36 is connected to a lear spring 38 of a circuit breaker lever 39 carrying a contact 40 cooperating with a stationary contact 4| grounded at 42. The lever 39 includes a rub- 2 bing block 43 of insulating material operated by a cam 44.

Referring to Fig. 1, the unit 25% includes a heat conducting metal case or housing 45 having an end wall 46 formed with an aperture to receive a reduced end t; of a heat conducting metal bushing or member 58 which is riveted over the inside of the end at. A body d9 of insulating material is so shaped as to have an annular flange or collar 56, a reduced section 5!, and an annular flange or collar 52. The collar is formed with a recess 53 to house the riveted over portion of the bushing E8. The terminal 3% is a conducting bolt and passes through body 49, by way of a bore 55. The bolt is provided with a head 55 which is adapted to seat in a recess 5'] in the body 49. The shank of the bolt may be provided with a portion 5t that is shaped to prevent turning of the bolt 3% relative to the body 49 due to jarring and vibrations.

The shank of the bolt 36 passes through an insulating bushing 59 housed within the coupling 48. The end of the bushing 48 provides a shoulder 6!) against which rest an insulating washer iii. A nut 52 threadedly engaging the threaded end of the bolt, when threaded home, draws the collar 52 tightly against the end wall 48.

To prevent the body 49 from turning within, the housing 45, due to jarring and vibrations, the collar 52 is provided with a notch in which is received a detent or depression formed in the housing 45. The body 49 is formed with a slit 6? which communicates with the recess or pocket 57. Between the collars 5D and 52 the portion 5i is formed with a spiral groove 68 to receive the resistance element 3? having one end 3M extending through the slit 6'! and into the recess 51 and is fixed to the bolt head 5% in any suitable manner, for example, by soldering. As to the specific formation of the head of the bolt as shown, in Fig. 4, the head may be formed with a boss Bil having a slot it to receive the end 3711 of the resistance element 3'! and portions of the boss may be staked over the end 31a. If desired, solder may be used to hold the end within the confines of the slot 1E]. The other end ll of resistance element 31 is threaded through an angular bore 12 in the terminal 35 carried, as shown in Fig. 2 by a closure or disc 13 of insulating material.

A resilient sheet metal washer 15 is placed adjacent the collar 50. The central aperture of washer 15 is of sufficient size so that it will not engage the riveted over portion 16 of the terminal 35 when the washer engages the collar 50 and the closure 13 is in its complete assembled nal and resistance element unit adapted for use with an electrical apparatus, .rforhexampler anignition timer, which is simpleuin design; ecoe nomical in manufacture and efficient in operation. This construction makes for compactness and durability and the resistance" element is' re-" siliently supported within the housing '45 and negatives any separation or breaking of connections between the

terminals

35 and 36 and the element.

It will be noted that the reduced orintermediate portion 5| of the-body 49 supports the resistance element 31 out of contact from the housing 45 and the coupling member 48, but the resistance element 31 is sufliciently closerto the housing 45 so that the housing will absorb heat from. the element 3'! when hot, said housing 45 transferring some of the heat to the coupling member 48 which in turn transfers heat to a timer housing 80.

The terminal unit 20 is attached to the timer housing '80 by threading the bushing V4!? in a tapped hole Bl provided by the-housing in the manner. shown in Fig: 2. The housing supports a head-82 for the ignition distributor 33.

While theembodiment of the present invention as herein disclosed, constitutes-a preferred form, it is to be understood that other .-forms might be adopted. I

What is claimed is as follows:

1. A terminal assembly foruse with'an electrical apparatus having a metal housing, said assembly comprising the housing, a heat conducting casing adapted to be supported by the housing, said casing having a closure of insulatingtmaterial at one end; a. terminal carried by the closure; a sleeve of insulating material located within the casing and having an internal shoulder; a second terminal adaptedto clamp .the sleeve against an internal wall of the casing," said terminal having ahead adapted to engage-the shoulder, I a shank portion extending into the housing and having a threaded portion and'a nut threadedly engaging the shank whereby the tightening of the nut clamps the sleeve against the casing; means for insulating the second terminal and the nut from the casing; a resistance element carried by the sleeve; and means for establishing electrical contact betweensaid resist- 4 ance element and said terminals, said resistance element having its intermediate portion sufficiently close to the casing whereby the casing will be effective for absorbing heat emanating from the resistance element when hot.

2. A terminal assembly for use with an electrical apparatus having a metal housing, said assembly comprising the housinm. a heat conducting casing adapted to be supported by the housing, said casing having a closure of insulating material at one end; a terminal carried by the closure a sleeve of insulating material located within the casing and having an internal shoulder and having-grooves formed in the exterior su1'face.-thereof;..a second terminal adapted to clampthe sleeve-against an internal wall of the casing, said terminal having a head adapted to engage the shoulder, a shank portion extending into the housing and having a threaded portion, and a nut threadedly engaging the shank whereby the tightening of the nut clamps the sleeve against the casing; means for insulating the sec- 0nd terminal and the nut from the casing'ya resistance element carried by the sleeve; a resistanee element wound in said grooves and having its opposite ends passed through a slot insaid sleeve to the interior of said sleeve; and means for establishing electrical connection between said ends of the resistanceelement and said terminals.

3. A terminal assembly for electrical apparatus having a metal housing provided with an open,- ing, said assembly comprising the housing; a heat conducting casing having atub'ular extension at the other end, said extension having to have threaded engagement with the opening of the housing; a body of insulating material located within the-casing and having a counterbored passage therein to provide a.shoulder; a terminal member adapted to clamp the body against an interior wall of the casing, said terminal member having a head adapted to engage the shoulder within the passage of the body, a shank portion projecting through the extension and having a threaded portion, and .a nut threadedly engaging the threaded shankwhereby tightening of the nut clamps thebody to the casin means for insulating theshank and nut from the extension; a second terminalemember carried by theclosure; and a resistance supported on the body and having electrical connection with each of said terminal members.

vMAXGr. BALES;

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,661,019 Thordarson 'Feb: 28, 1928 2,145,629 Nicoud et al Jan. 31, 1939 2,391,065 McKinley Dec. 18, I945