US 2618712 A
Description (OCR text may contain errors)
NOV. 18, 1952 SMQLEDZKY 2,618,712
CONTACT SWITCH FOR ELECTRICAL CONTACTS Filed Feb. 26, 1949 Patented Nov. 18, 1952 CONTACT SWITCH FOR ELECTRICAL CONTACTS Sydney Moledzky, Brooklyn, N. Y. Application February 26, 1949, Serial No. 78,483
(Cl. 2i)052) 3 Claims.
This invention relates to a momentary contact switch for electrical contacts such as alarm systems and the like and has for its principal ob ject the provision of such a switch which will be quick and sensitive in operation.
Another object of the present invention is the provision of such a switch which will be enicient in operation, inexpensive to manufacture and eX- tremely simple in construction.
A still further object of the invention is the provision of such switch which when applied will permit the article to which it is applied to be left in such position that, while the switch would normally operate, it will remain inoperative.
Still another and further object of the invention is the provision of such a switch which may be readily adjusted to provide for sensitiveness with which it may operate under any desired condition in its use.
In the drawings accompanying and forming a part of this specification:
Figure 1 is a front elevation of the present improved switch shown attached and in operative position;
Fig. 2 is a side sectional view thereof taken on line 2-2 of Fig. 1;
Fig. 3 is a similar view to Fig. 2 illustrating the position of the parts when the article to which this improved switch is attached is left in an inclined position; and
Fig. i is a wiring diagram illustrating the switch in position in an alarm circuit.
Similar characters of reference indicate corresponding parts in the several views.
Before explaining in detail the present improvement and mode of operation thereof, it is to be understood that the invention is not limited to the details of construction illustrated in the accompanying drawings, since the invention is capable of other embodiments and only the principle thereof and the best mode, which has been contemplated, of applying that principle, has been set forth.
The present invention comprises a switch having a pair of swinging arms swingable in the same direction in the nature of pendulums carried by a fixed or stationary frame which is especially adaptable to be attached to a vehicle such as an automobile or truck and which will operate to sound an alarm if the vehicle is moved or jarred.
The switch mechanism comprises a frame member 2, of non-conductible material, having a base 4 and a pair of upstanding arms 6 and 8, the member 2 thus forming a U-shaped supporting frame.
This U-shaped member or frame 2 is adapted to be secured in any suitable manner at its base 4 to any suitable but inaccessible part of a vehicle.
At the top of this frame member 2 and extending through the upstanding arms 5 and 8 is a conducting rod 19 secured at either end thereof, by suitable nuts or fastening means 42, to the outer sides of the upstanding arms 6 and 8.
Supported centrally on this rod H] and in engagement therewith is a swinging member i i of conductive material which is adapted to swing or oscillate in pendulum fashion on the rod I8.
Also carried by this supporting rod [0 is a U-shaped member l6 of non-conductible material and of somewhat lighter construction than memher I 4, the upstanding arms of which lie between the arms 6 and 8 of the frame 2 and straddle the swinging member l4. Suitable bushings I8 are positioned along the rod H! to separate the various parts and permit their free movement.
This U-shaped member [6 is also adapted to oscillate or swing in the manner of a pendulum on the shaft IS in a direction similar to that of the member l4. Carried at its base the member 16 has a conductive U-shaped member 20, the upstanding arms of which straddle the base of the member 14 at right angles to the straddle of the arms of the member 5.
This member 20 is of very light material so that its upstanding arms may be easily bent to vary the clearance between them and the member M as desired. This member 20 likewise carries a very light Wire connection 22 to the positive side of the power source. This connection is made with very light wire in order not to interfere with the free swinging action of member i 6.
The rod [0 has a wire connection 24 to the negative side of the power source or ground.
In Fig. 4 a simple wiring diagram is illustrated in which it will be observed that a circuit leads from battery 25 through control switch 23, through wire 22 to the U member 20. Wire 22 likewise leads through wire 3!) to one side of switch 32 and also through wire 34 through alarm 36 to one side of switch 38 connected in parallel with switch 32.
The ground or negative side of the battery 25 leads through wire 40 to the other side of switch 38 and through wire 42 through locking relay 44 through wire 46 to the other side of switch 32 and through wire 24 to conductive rod i0 and member H.
The operation of the present improved switch is as follows:
The member 2 is secured in any suitable manner to a stationary part of a vehicle inaccessible.
3 to outside interference in such manner that it will permit the vehicle to be left standing at an incline either forward or backward and permit the two members 14 and It to swing in unison without making contact.
However, should the vehicle be suddenly jarred either by being run into or started the two arms will swing out of unison and cause a momentary contact to be made between conductive arm 14 and either upstanding arm of conductive member 20. This will cause a circuit to be established from the battery to looking relay 44 to pull down the arms of switches 32 and 38 and cause the alarm 36 to be sounded.
Even though the contact between members [4 and 20 is broken instantaneously thecircuit once established will be held by the locking relay 44 until switch 28 is opened.
While there has been shown, described and pointed out the fundamental novel features of the invention, it is to be understood that various omissions, substitutions and changes may be made by those skilled in the art in the form and details of the device illustrated and in its operation without departing from the'spirit of the invention. limited only as indicated by the scope of the following claims.
What is claimed is:
1. An electrical contact switch comprising a pair of members each supported for swinging movement relative to each other and means carriedby each member for efiecting an electrical contact upon a differencein swinging movement of one of said members relative to the other, each of said members having a common axis and-located inthe same p1ane, one having a pair of supporting arms and the other a single supportingiarm located between said pair of supporting. arms.
2. An' electrical contact switch-comprising a It is the intention, therefore, to. be
pair of swinging members having a common axis and located in the same plane, one having a pair of supporting arms and the other a single supporting arm located between said pair of supporting arms, each of said members adapted to swing in unison and relative to each other and means carried by each member for effecting electrical contact upon a difi-erence inswinging movement of one of said members relative to the other.
3. An electrical contact switch comprising a pair of swinging members having a common axis and located in the same plane, one havin a pair of supporting arms and the other a single supporting :arm located between said pair of supporting arms, each of said members adapted to swing in unison and relative to each other and means carried by each member for effecting electrical contact upon a difierence in swinging movement of one of said members relative to the other, the contact means of one of said members effective to efiect contact with theother upon said relative difierence in swinging movement in either direction.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PA'IENTS Number Name Date 1,805,147 Murray May 12, 1931 1,908,430 Lapsley May 9, 1933 2,308,215 Jacobs Aug. 31, 1943 FOREIGN PATENTS Number Country Date 171,207 Switzerland Nov'. 1, 1 34 174,859 Switzerland Apr. 16, 1935 408,886 Great Britain Apr. 19, 1934