US3773988A

US3773988A - Switch with interchangeable blades

Info

Publication number: US3773988A
Application number: US00252704A
Authority: US
Inventors: J Radice
Original assignee: Singer Co
Current assignee: Singer Co; CAE Link Corp
Priority date: 1972-05-12
Filing date: 1972-05-12
Publication date: 1973-11-20
Anticipated expiration: 1990-11-20

Abstract

A switch with two identical interchangeable blades which permit ease of contact replacement and extended switch life is shown. Each blade has a top and a bottom contact so that when assembled in a housing the top contact of one is aligned with the bottom contact of the other. By simply interchanging blades the spare contact may be put into use thus offering quick and inexpensive contact replacement. Other features include means of stacking the switches with each switch in the stack providing a cover for the one before it thus requiring only one cover for the whole stack.

Description

United States Patent [191 Radice Nov. 20, 1973 [54] SWITCH WITH INTERCHANGEABLE 3,313,905 4/ l967 Zagorski 200/ 166 BC UX BLADES [75] Inventor: John G. Radice, Binghamton, NY. Prlmary Scott Attorney-Franc1s L. Masselle [73] Assignee: The Singer Company, Binghamton,

57 ABSTRACT [22] Flled' May 1972 A switch with two identical interchangeable blades PP which permit ease of contact replacement and extended switch life is shown. Each blade has a top and [52] us Cl 200/6 R 200/6 BB 200/166 BC a bottom contact so that when assembled in a housing 51 Int. Cl. H0lh 21/12 one l 'l with 58 Field of Search 200/6 R 6 B 6 BB the By "terchangmg blades 200/6 C 165 166 BC 166 J 1 spare contact may be put into use thus offering quick and inexpensive contact replacement. Other features [56] References Cited include means of stacking the switches with each switch in the stack providing a cover for the one be- UNITED STATES PATENTS fore it thus requiring only one cover for the whole 2,782,287 2/l957 Smith 200/6 C X t k 3,359,392 12/1967 Heath 200/6 R X 3,553,720 l/l97l Brown 200/166 J X 7 Claims, 3 Drawing Figures PAIENTEDnuvzo um 3373388 25 Eli FIG. 2

I l 1 F SWITCH WITH INTERCHANGEABLE BLADES BACKGROUND OF THE INVENTION This invention relates to switches in general and more particularly to an improved switch with interchangeable blades.

It is well known in the art the switch contacts are subject to wear due to arcing, etc. Attempts have been made to obtain switch action which will minimize these effects. Still, ultimately contacts will have to be re placed. This of course is a factor in the cost of switch operation. It also means that replacement contacts must always be kept on hand and, if the whole switch is not to be replaced that the switch be designed so that contacts may easily be replaced. In some switching operations failure of the switch must be remedied as quickly as possible. For example switches in highway traffic light controlls cannot long be out of service without undesirable results. In such systems repairs must be made quickly. One approach to a quick switch contact replacement is shown in U. S. Pat. No. 2,230,737. One of the switch contacts is made rotatable with two contact surfaces so that, when excessive wear occurs the one contact need only be rotated to the other position.

Although this device goes a long way toward solving problems of contact replacement it does have drawbacks. When the second side is worn both contacts will have to be replaced. Since the contacts are both constructed differently, two types of contact must be manufactured and kept on hand. In addition the type of design employed is bulky and complete contact replacement relatively time consuming.

SUMMARY OF THE INVENTION The switch of the present invention uses two identical interchangeable blades each having two contacts. This means only one type blade (or contact) need be manufactured and kept on hand. Also interchanging the blades completely restores the switch to its original condition, i. e., both contacts are brand new. The switch is designed for compactness and ease in changing blades. Additionally, any number of switches may be stacked together with each additional switch providing a cover for the previous switch thereby requiring a I cover only on the last switch. Even in situations where quick repair is not essential the switch of the present invention effectively doubles switch life through providing a spare set of contacts which can be put into usein a simple manner.

BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is a perspective view of a preferred embodiment of the switch of the present invention.

FIG. 2 is an elevation view of FIG. 1.

FIG. 3 is a plan view of two of the switches of FIG. 1 connected to-gether.

DETAILED DESCRIPTION A perspective view of a preferred embodiment of the uncovered switch is shown in FIG. I and an elevation view in FIG. 2. Each switch blade I l is essentially a thin flat piece of a resilient conductive material and contains a flat contact 13 on the top and a rounded contact structed such that projections 21 (shown on FIG. 2) restrain movement of the switch except as required for switching action. The blades are arranged so that contact 15 on the bottom of the upper blade 11 will be aligned with contact 13 on the top of the lower blade 11. Also formed into housing 17 is a pin 25 on which an actuator 23 is placed for rotation. A projection 26 in the housing limits the travel of actuator 23.

15 on the bottom. The ends 16 of the blades 11 are 6 If actuator 23 is pushed upward the contact 13 of the lower blade 11, guided by a projection 27 on the housing 17, will contact the contact 15 of upper blade 11. Connection of the switch into a circuit is made by attaching clips 19 on the ends of wires 20 to the bent ends 16 of the blades 11. Holes 29 are provided to allow a plurality of switches to be fastened together as shown on FIG. 3.

FIG. 3 shows two

switches

33 and 31 and a cover 35 held together by bolts 37 and nuts 39. As can be seen, switch 31 provides the cover for switch 33. In like manner any number of switches may be stacked with only one cover 35 required.

When the

contacts

13 and 15 of any of the switches are worn it is only necessary to unfasten nuts 39, disconnect clips 19 are interchange the two blades 11. As shown on FIG. 2, contact 13a would then be on the bottom and 15a on the top. In this manner the switch may be quickly restored to its original condition.

Thus a switch with interchangeable contacts which permits quick repair and effectively doubles the switch life before contact replacement is required has been shown. Although a specific embodiment has been shown it will be evident to those skilled in the art that various modifications may be made without departing from the spirit of the invention which is intended to be limited solely by the appended claims.

What is claimed is:

1. An electrical switch of the hard contact, flexible blade type comprising, in combination:

a. a pair of switch blades each having a first raised contact closely adjacent one end on one side, and a second raised contact spaced from said one end by less than half the length of said blade on the opposite side of each blade;

. a housing having first and second internal supports holding in spaced relation the ends opposite said one end of each of said blades;

c. said support means being so constructed and arranged relative to the dimensions of said blades that with one blade held by said first support and the outer blade held by said second support, with said one side of said one blade facing said opposite side of said other blade, said first contact of said one blade is aligned with said second contact of said other blade for contact therewith upon relative movement of said one ends of said blades toward one another, and upon reversal of said blades to hold said one blade by said second support and the other blade by said first support, with said one side of said opposite blade facing said opposite side of said one blade, said first contact of said other blade is aligned with said second contact of said one blade for contact therewith upon relative movement of said one ends of said blades toward one another; and

d. actuating means for effecting relative movement of said one ends of said blades to move the aligned contacts in and out of engagement.

2. The invention according to claim 1 wherein said blades are identical in construction.

3. The invention according to claim 2 wherein each of said blades includes a bent-over portion at the ends opposite said one ends, said bent-over portion being engaged by said supports to hold said opposite ends in spaced relation.

4. The invention according to claim 3 blades are essentially parallel to one another when held by said supports.

5. The invention according to claim 4 wherein said one end of one of said blades is engaged by said actuating means and moved toward said one end of the other wherein said housing for pivotal movement with respect thereto.

Claims

1. An electrical switch of the hard contact, flexible blade type comprising, in combination: a. a pair of switch blades each having a first raised contact closely adjacent one end on one side, and a second raised contact spaced from said one end by less than half the length of said blade on the opposite side of each blade; b. a housing having first and second internal supports holding in spaced relation the ends opposite said one end of each of said blades; c. said support means being so constructed and arranged relative to the dimensions of said blades that with one blade held by said first support and the outer blade held by said second support, with said one side of said one blade facing said opposite side of said other blade, said first contact of said one blade is aligned with said second contact of said other blade for contact therewith upon relative movement of said one ends of said blades toward one another, and upon reversal of said blades to hold said one blade by said second support and the other blade by said first support, with said one side of said opposite blade facing said opposite side of said one blade, said first contact of said other blade is aligned with said second contact of said one blade for contact therewith upon relative movement of said one ends of said blades toward one another; and d. actuating means for effecting relative movement of said one ends of said blades to move the aligned contacts in and out of engagement.

4. The invention according to claim 3 wherein said blades are essentially parallel to one another when helD by said supports.

5. The invention according to claim 4 wherein said one end of one of said blades is engaged by said actuating means and moved toward said one end of the other blade, with the opposite ends of each blade remaining stationary, whereby the engaged blade is flexed, moving said one end thereof out of parallel with said one end of the other blade during actuation.

6. The invention according to claim 5 and further including electrical connecting clips held by each of said supports for electrical contact with the ends of said blades held by said supports.

7. The invention according to claim 5 wherein said actuating means comprises a member mounted on said housing for pivotal movement with respect thereto.