Switch housing with magnetic roller plunger
First Claim
1. A housing for a magnetic reed contact, comprising:
- (a) a roller plunger having a central axis and extending radially about said central axis, said roller plunger including a permanent magnet;
(b) body means for holding said roller plunger and permitting rotation and a predetermined amount of reciprocal movement thereof radially with respect to said central axis while said roller plunger remains within said body means;
(c) biasing means, associated with said body means, for urging said roller plunger radially toward a first position with respect to said housing; and
(d) means for holding a magnetic read contact in a predetermined location with respect to said body means.
5 Assignments
0 Petitions
Reexamination
Accused Products
Abstract
A plunger-operated switch assembly, useful for sensing the presence of a movable object such as a door or window, in which a magnetic reed contact is actuated by a magnet in the form of a disk-like roller plunger, or by a smaller magnet carried in the center of a roller plunger. The roller plunger is located in a cavity defined by a housing and projects through an aperture in a face plate including a flange by which the housing can be mounted recessed in a desired location. The magnetic reed contact is held alongside the cavity containing the roller plunger, so that the housing can be compact. A magnetic electrical conductor lead connected with a magnetic reed is located so as to be effectively within the magnetic field of the actuating magnet when the roller plunger is depressed a small distance so that the magnetic reed switch is actuated by a small movement of the plunger.
14 Citations
27 Claims
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1. A housing for a magnetic reed contact, comprising:
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(a) a roller plunger having a central axis and extending radially about said central axis, said roller plunger including a permanent magnet; (b) body means for holding said roller plunger and permitting rotation and a predetermined amount of reciprocal movement thereof radially with respect to said central axis while said roller plunger remains within said body means; (c) biasing means, associated with said body means, for urging said roller plunger radially toward a first position with respect to said housing; and (d) means for holding a magnetic read contact in a predetermined location with respect to said body means. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A housing for a magnetic reed contact, comprising:
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(a) a roller plunger extending radially about a central axis, said roller plunger including magnet receptacle means for holding a permanent magnet centrally within said roller plunger; (b) body means for holding said roller plunger and permitting reciprocal radial movement thereof; (c) biasing means associated with said body means for urging said roller plunger toward a first position with respect to said housing; and (d) means associated with said body means for holding a magnetic reed contact in a predetermined location therein. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A switch assembly, comprising:
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(a) a housing; (b) a magnetic reed contact held in the housing; (c) a roller plunger in the shape of a short cylinder having a central longitudinal axis, said plunger being reciprocally movable radially within said housing between a first position in which a portion of said roller plunger protrudes radially from said housing and a second position in which said roller plunger is depressed further into said housing than said first position, and said roller plunger including a magnet defining an axis of polarity parallel with the central longitudinal axis of said cylinder, said magnetic reed contact being held in said housing in such a position with respect to said roller plunger that when said roller plunger moves between said first position and said second position said magnetic reed contact is thereby changed between respective states of activation; and (d) means for biasing said roller plunger toward said first position. - View Dependent Claims (17, 18, 19)
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20. A plunger-controlled switch assembly for use in an electrical circuit, comprising:
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(a) a disk-like roller plunger having a central axis; (b) a housing including a face member and body means defining a plunger cavity extending rearwardly from said face member for containing said roller plunger movably therein, said roller plunger being held in said plunger cavity and being movable reciprocally therein, in a radial direction with respect to said central axis, and said face member defining a plunger aperture and a portion of said roller plunger protruding forwardly through said plunger aperture when said roller plunger is in a first position; (c) biasing means associated with said body for urging said roller plunger toward said first position; (d) an actuating magnet located centrally in said roller plunger; (e) a magnetic reed contact held in said body proximate said plunger cavity, said reed contact being in a first predetermined state in response to said roller plunger being in said first position and being changed to a second predetermined state in response to depression of said roller plunger by at least a predetermined distance from said first position. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27)
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Specification