US3866006A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pushbutton switch with reciprocating cam
Assignee: Siemens AG
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Filing: 1973-08-17
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Granted: 1975-02-11
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Expires: 1993-08-17
Abstract
Abstract A pushbutton switch having a shaft with first and second operating or cam surfaces for sequentially controlling the movement of a spring biased movable contact into engagement with the fixed contact as the shaft is reciprocated in a housing from a rest position to a second position characterized by the first cam surface forcing the movable contact away from the fixed contact during initial movement of the shaft from the rest position and the second cam surface subsequently enabling the movable contact to move into engagement with the fixed contact. The coaction of the first cam surface and the movable contact opposes the initial movement of the shaft from the rest position and the coaction of the movable contact with the second cam surface assist movement of the shaft after the initial movement to ensure that a contact is obtained.
Inventors
- 👤 Werner Westram
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:45
CPC Classifications
H; H01; H01H; H01H13/00; H01H13/50; B; B41; B41J; B41J5/00; B41J5/08; H04; H04L; H04L13/00; H04L13/16
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
242 words
A pushbutton switch for use in keyboards which are utilized in typewriters and telex machines, said switch comprising a housing, a shaft mounted in the housing for reciprocation between a first and second position, means biasing the shaft towards the first position, a fixed contact mounted in said housing, a movable contact mounted in said housing, means biasing said movable contact towards the fixed contact, said shaft having a first operating surface inclined to the direction of reciprocation and a second operating surface inclined in an opposite direction to the direction of reciprocation, said first surface being disposed on the shaft to engage the movable contact to hold it out of engagement with said fixed contact and to move the movable contact in a direction away from the fixed contact as the shaft moves from the first position to an intermediate position during movement towards the second position, said second operating surface engaging the movable contact when the shaft reaches the intermediate position to enable the means biasing the movable contact to urge the movable contact along the second Operating surface and into contact with the fixed contact as the shaft moves from the intermediate position towards the second position, whereby initial movement of the shaft between the first position through the intermediate position is opposed by both biasing means and subsequent movement from the intermediate position towards the second position is aided by the biasing means acting on the movable contact.
Claim 2
Dependent Claim
242 words
A pushbutton switch for use in keyboards which are utilized in typewriters and telex machines, said switch comprising a housing, a shaft mounted in the housing for reciprocation between a first and second position, means biasing the shaft towards the first position, a fixed contact mounted in said housing, a movable contact mounted in said housing, means biasing said movable contact towards the fixed contact, said shaft having a first operating surface inclined to the direction of reciprocation and a second operating surface inclined in an opposite direction to the direction of reciprocation, said first surface being disposed on the shaft to engage the movable contact to hold it out of engagement with said fixed contact and to move the movable contact in a direction away from the fixed contact as the shaft moves from the first position to an intermediate position during movement towards the second position, said second operating surface engaging the movable contact when the shaft reaches the intermediate position to enable the means biasing the movable contact to urge the movable contact along the second Operating surface and into contact with the fixed contact as the shaft moves from the intermediate position towards the second position, whereby initial movement of the shaft between the first position through the intermediate position is opposed by both biasing means and subsequent movement from the intermediate position towards the second position is aided by the biasing means acting on the movable contact.
Claim 3
Dependent Claim
29 words
A pushbutton switch according to claim 1, wherein a contact surface on the fixed contact is inclined at an angle to the direction of movement of the movable contact.
Claim 4
Dependent Claim
26 words
A pushbutton switch according to claim 1, wherein the first operating surface has an inclination of approximately 28* to the direction of reciprocation of the shaft.
Claim 5
Dependent Claim
28 words
A pushbutton switch according to claim 3, wherein the fixed contact has a contact surface inclined at an angle to the direction of movement of the movable contact.
Claim 6
Dependent Claim
28 words
A pushbutton switch according to claim 3, wherein the second operating surface has an angle of inclination of approximately -28* to the direction of reciprocation of the shaft.
Claim 7
Dependent Claim
28 words
A pushbutton switch according to claim 5, wherein the fixed contact has a contact surface inclined at an angle to the direction of movement of the movable contact.
Claim 8
Dependent Claim
73 words
A pushbutton switch according to claim 1, wherein the movable contact has a U-shaped configuration with a pair of legs interconnected by a bight portion, said legs being mounted in the housing with the bight portion sequentially engaging the first and second operating surfaces as the shaft is reciprocated from between the first and second positions and said bight portion engaging a contact surface on the fixed contact to form a circuit therebetween.
Claim 9
Dependent Claim
42 words
A pushbutton switch according to claim 7, wherein the contact surface of the fixed contact is inclined at an angle to the direction of movement of the bight portion of the movable contact to prevent chatter during the making of contact therebetween.
Claim 10
Dependent Claim
28 words
A pushbutton switch according to claim 7, wherein a first operation surface is inclined at an angle of approximately 28* to the direction of reciprocation of the shaft.
Claim 11
Dependent Claim
28 words
A pushbutton switch according to claim 9, wherein the second operating surface is inclined at an angle of approximately -28* to the direction of reciprocation of the shaft.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-10 | 1978-08-12 | 1979-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-10 | 1982-08-12 | 1983-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-10 | 1986-08-12 | 1987-02-11 | $7700.00 | Window Closed / Lapsed |