Push and rocker action switch

• US 4,654,488 A
• Filed: 03/26/1986
• Issued: 03/31/1987
• Est. Priority Date: 03/26/1986
• Status: Expired due to Term

• Current Assignee: Nortel Networks Limited (Nortel Networks Corporation)
• Original Assignee: Northern Telecom Limited (Nortel Networks Corporation)
• Inventors: Westfall, Alan P.
• Primary Examiner(s): Scott, J. R.
• Application Number:
  US06/844,500
• Time in Patent Office: 370 Days
• Field of Search: 200/5 R, 200/5 A, 200/6 A, 200/17 R, 200/18 R, 200/153 K, 200/159 B, 200/339, 200/340, 179/90 K, 179/158 R
• US Class Current: 200/5.00R
• CPC Class Codes: H01H 13/705 characterised by construction, mounting or arrangement of operating parts, e.g. push-buttons or keys
• CPC Class Codes: H01H 2215/004 Collapsible dome or bubble
• CPC Class Codes: H01H 2215/006 Only mechanical function
• CPC Class Codes: H01H 2215/022 Asymmetric; Elliptic; Square
• CPC Class Codes: H01H 2221/018 Tumbler
• CPC Class Codes: H01H 2231/022 Telephone handset
• CPC Class Codes: H04M 1/02 Constructional features of telephone sets

Abstract

A push and rocker action switch includes a pair of switchable contacts, either of which is switchable in response to a rocker motion of a depressible actuating member, and both of which are switchable at the same time in response to an overall push depression of the actuating member. The actuating member is positioned by an opening defined in a faceplate such that it is centrally supported by a resiliently yieldable pivot. The pivot and the switchable contacts are provided by raised portions in an elastomeric sheet material which is supported by a circuit board fastened to an underside of the faceplate.

Claims

1. A push and rocker action switch comprising:

first and second contact means being spaced apart one from the other and a pivot positioned between the first and second contact means,

an actuating member covering the contact means and being supported by the pivot, such that depression of either end of the actuating member causes a rocker motion about the pivot and a switching operation of one or the other of the contact means;

elements of the first and second contact means being provided by depressible portions of an elastomeric sheet material, said depressible portions being arranged in juxtaposition with the ends of the actuating member; and

the pivot being provided by a raised formation in the elastomeric sheet material whereby said pivot is resiliently yieldable such that depression of the entire actuating member is permitted to effect a switching of both the contact means at the same time.

2. A push and rocker switch as defined in claim 1 wherein each of the depressible elements of each of the contact means is provided by a hollow protuberance extending toward a surface of the actuating member for contact therewith and a conductive material being centrally carried within the protuberance for contact with conductors carried by a circuit board against which the elastomeric sheet is supported;

and

an apex of the raised formation lying along a line normal to a line between central portions of the protuberances and being raised to a degree sufficient to carry said surface of the actuating member spaced from at least one of the protuberances.

3. A push and rocker action switch as defined in claim 2 wherein the actuating member and the elastomeric sheet are confined between a faceplate and the circuit board, the surface of the actuating member being bounded by longer and shorter side walls and being positioned by peripheral edges of an opening defined in the faceplate, each of the longer side walls including a pivot formation adjacent the surface and equidistant from the shorter walls, each pivot formation being a lateral projection adjacent said surface for contacting a portion of the under surface of the faceplate adjacent one of the peripheral edges.

4. A push and rocker action switch as defined in claim 1 wherein the raised formation in the elastomeric sheet material comprises:

a first pair of upwardly inclined walls;

a second pair of lesser inclined walls, each extending from one of the first pair of walls and meeting at an apex along a line normal to a line between the first and second contact means;

the first and second pairs of walls being of at least a first predetermined wall thickness; and

a pair of end walls each joining the ends of the first and second pair of walls and the elastomeric sheet and being of a second wall thickness, the second wall thickness being thinner than the first predetermined wall thickness.

5. A push and rocker action switch as defined in claim 1 wherein the raised formation comprises a plurality of resilient elements, at least one of which being so arranged as to collapse when only slightly compressed and thereby cause the associated compressional force to be concentrated upon other of the resilient elements.

6. A telephone set having a faceplate with an elongated actuation member residing in the faceplate over an elastomeric sheet material carried on a circuit board fastened to the underside of the faceplate, a pivot being positioned between two contact means in the sheet material, the pivot being in a form of a protuberance in the sheet material and extended therefrom a distance to support the actuation member for rocking motion and accompanying switch actuation of a respective one of the contact means by depression of one end or the other of the actuation member, the pivot being resiliently collapsible upon application of significant pressure over the length of the actuating member to cause switch actuation in both of the contact means at the same time.