Multiple position manual switch

• US 5,516,991 A
• Filed: 11/23/1994
• Issued: 05/14/1996
• Est. Priority Date: 11/26/1993
• Status: Expired due to Fees

• Current Assignee: Bausch & Lomb Incorporated (Bausch Health Cos., Inc.)
• Original Assignee: Bausch & Lomb Incorporated (Bausch Health Cos., Inc.)
• Inventors: Hommann, Edgar
• Primary Examiner(s): SCOTT, JAMES R
• Application Number:
  US08/344,032
• Time in Patent Office: 538 Days
• Field of Search: 200/5 R, 200/5 A, 200/6 A, 200/52 R, 200/6 R, 200/553, 200/557, 200/292, 307/115, 15/21.1, 15/22.1, 15/23
• US Class Current: 200/6.00R
• CPC Class Codes: H01H 1/403 Contacts forming part of a printed circuit multilayer keyboard switches H01H13/702; thumbwheel switches H01H19/001; for rotary switches with axial contact pressure H01H19/585
• CPC Class Codes: H01H 13/62 the contact returning to its original state upon manual release of a latch latch released by second push-button H01H13/68
• CPC Class Codes: H01H 13/70 having a plurality of operating members associated with different sets of contacts, e.g. keyboard mounting together a plurality of independent switches H02B
• CPC Class Codes: H01H 2003/007 the contacts being actuated by deformation of a flexible housing
• CPC Class Codes: H01H 2221/002 integral with membrane
• CPC Class Codes: H01H 25/041 having a generally flat operating member depressible at different locations to operate different controls

Abstract

A manual switch (2) has a switching plate (9), which can be tilted to several sides and is mounted on a mounting (10). This switching plate (9) can move with star-shaped actuating arms that correspond to the contact arms of a contact spring (7) in the direction of a printed circuit board (6), so that it can close a circuit by means releasably, lockingly engaging the selected actuating arm against a respective contact arm and an electric contact on the printed circuit board. At any switch position one can switch back directly into the zero position by pressing an adjusting arm (13) which moves the switching plate (9) back into its non-tilted position.

Claims

1. A multi-stage manual switch for use in an electric circuit, said switch enabling selection between individual output stages of a multi-stage electric motor connected to said circuit, said multi-stage switch comprising:

a) a contact spring having at least three radially extending contact arms each normally biased in spaced relation adjacent a respective stationary electric contact of said circuit, each of said electric contact and contact arm pair, when engaged, completing a path in said circuit which activates a different one of said output stages of said motor;

b) a switching plate having at least three radially extending actuating arms positioned adjacent said at least three contact arms, respectively, opposite said electric contacts;

c) a post extending perpendicularly from the center of said contact spring, said switching plate being pivotally mounted to said post; and

d) switch engagement means for releasably and lockingly engaging a selected one of said contact arm and actuating arm pairs upon manually pressing the actuating arm against the associated contact arm of said selected pair whereupon said associated contact arm is brought into engagement with a respective said electric contact, thereby actuating a selected one of said output stages.

2. The multi-stage manual switch of claim 1 wherein said releasable engagement means comprises a switching plate housing having at least three radially extending pairs of spaced guide arms between which a respective actuating arm of said switching plate extends, said guide arms each having a resilient projection extending in the direction of the other one of said guide arm of a said guide arm pair, whereby opposite sides of said actuating arm may be pivotally forced past said resilient projections of a respective guide arm pair to releasably engage a respective said contact arm which, in turn, is forced against a respective said electric contact to actuate said selected one of said output stages, said resilient projections acting to prevent movement of said engaged actuating arm in a direction away from said engaged contact arm until said engaged actuating arm is moved in said direction with a force sufficient to pass said resilient projections.

3. The multi-stage manual switch of claim 2 wherein the pivotal mounting of said switching plate causes an engaged actuating arm to move in said direction from a respective said contact arm, and pass said resilient projections, and thereby disengaging said engaged actuating arm upon manually pressing a different one of said actuating arms.

4. The multi-stage manual switch of claim 2 wherein said switching housing is mounted to said post between said contact spring and said switching plate.

5. The multi-stage manual switch of claim 1, and further comprising a return lever pivotally mounted to said post on the side of said switching plate opposite said contact spring, said return lever having a bearing surface adjacent said post and first and second, opposite ends spaced from said post, whereby manually pressing said first end causes said bearing surface to be pressed against the portion of said switching plate located adjacent said post, said return lever thereby pivoting said switching plate to a position where none of said actuating arms is engaged with a respective said contact arm, and said motor thereby being rendered inactive.

6. The multi-stage manual switch of claim 5, and further comprising a plurality of elastic keying bodies positioned in covering relation over respective ones of each of said actuating arms and said return lever first end, said keying bodies each having an exposed surface against which a user may press with a finger to operate said switch by bringing said keying body into contact with a respect one of said actuating arms and return lever first end.

7. The multi-stage manual switch of claim 2 wherein said projections are elongated flanges extending parallel to one another on each guide arm pair and parallel to a respective said actuating arm.

8. The multi-stage manual switch of claim 1 wherein said contact spring is mounted on a first conducting track of a printed circuit board and said stationary electric contacts comprise second, third and fourth conducting tracks of said printed circuit board.