US3721791A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arcuate form electrical switches having an axially displaceable actuator
Assignee: Johnson Electric International UK Ltd
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Filing: 1971-06-25
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Granted: 1973-03-20
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Expires: 1991-06-25
Abstract
Abstract An electrical switch device is adapted for use in conjunction with a fluid-operated cylinder and piston mechanism, for example to indicate overtravel of the mechanism. The device is in the form of a ring and surrounds the piston rod. It has a sealed housing for the contact elements of the switch, the top wall of the housing being resiliently deformable by a spring-mounted operated member carried by the piston rod to open the switch contacts.
Inventors
- 👤 G Grieves
- 👤 B Holden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:14
CPC Classifications
H; H01; H01H; H01H35/00; H01H35/24; H01H35/38
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
128 words
In a switch mechanism having a rod member movable axially relative to a support member, an electrical switch device comprising, in combination, a carrier having a recess formed therein occupying at least an arc of an annulus and electrical contacts supported on the carrier within said recess and extending over at least a portion of the annular extent of said recess, said carrier being disposed with the center of the arc of said recess substantially co-incident with the central longitudinal axis of the rod member, the carrier being fixed relative to one of said members of the mechanism, an actuator for the contacts being provided in fixed relation to the other of said members, whereby relative movement between said members effectuates an opening and closing of said contacts.
Claim 2
Dependent Claim
128 words
In a switch mechanism having a rod member movable axially relative to a support member, an electrical switch device comprising, in combination, a carrier having a recess formed therein occupying at least an arc of an annulus and electrical contacts supported on the carrier within said recess and extending over at least a portion of the annular extent of said recess, said carrier being disposed with the center of the arc of said recess substantially co-incident with the central longitudinal axis of the rod member, the carrier being fixed relative to one of said members of the mechanism, an actuator for the contacts being provided in fixed relation to the other of said members, whereby relative movement between said members effectuates an opening and closing of said contacts.
Claim 3
Dependent Claim
31 words
A switch mechanism according to claim 1 wherein the carrier is mounted on the support member and said actuator is in the form of an element carried by the rod member.
Claim 4
Dependent Claim
58 words
A switch mechanism aCcording to claim 2, wherein resilient means act upon the actuator urging it to a predetermined position on the rod member such that said relative movement of the members, by deformation of the resilient means, can be continued with arrest of the actuator after movement of the contacts to an end position by the actuator.
Claim 5
Dependent Claim
30 words
A switch mechanism according to claim 1, wherein concentric flanges on the carrier define said recess, a displaceable sealing member bridging said flanges to form an enclosure for the contacts.
Claim 6
Dependent Claim
30 words
A switch mechanism according to claim 4, wherein closure elements are provided at spaced positions in said recess, an arcuate enclosure for the contacts having its angular limits defined thereby.
Claim 7
Dependent Claim
17 words
A switch mechanism according to claim 5 wherein the closure elements are integral with the sealing member.
Claim 8
Dependent Claim
20 words
A switch mechanism according to claim 5 wherein the sealing member continues over the full arcuate extent of the recess.
Claim 9
Dependent Claim
71 words
A switch mechanism according to claim 4 wherein the switch device comprises a cantilever member in said recess, one end of the member being secured to the carrier, a free end of the cantilever member carrying at least one of said contacts, a region of the cantilever member between said ends being capable of engagement with the sealing member for displacement of the cantilever member to open and close said contacts.
Claim 10
Dependent Claim
26 words
A switch mechanism according to claim 8 wherein a protruding portion of the cantilever member at said region projects towards the sealing member for said engagement.
Claim 11
Dependent Claim
27 words
A switch mechanism according to claim 8 wherein a portion of the sealing member projects into the recess to bear on the cantilever member at said region.
Claim 12
Dependent Claim
45 words
A switch mechanism according to claim 1 wherein the switch device comprises at least one elongate member carrying at least one of the contacts and said elongate member is of arcuate form and is mounted on the carrier to be concentric with the arcuate recess.
Claim 13
Dependent Claim
66 words
A switch mechanism according to claim 1 wherein the switch device comprises at least one elongate member having one end secured to the carrier and having a region remote from said end carrying at least one of said contacts, a guide projecting from the carrier being engageable with the elongate to control the direction of displacement of said contact with said relative movement between the members.
Claim 14
Dependent Claim
92 words
An electrical switch device comprising, in combination, a carrier, an enclosed recess of annular form on said carrier and the carrier extending at least partly around a space in the region of the central axis of said arcuate form, contact members within said recess projecting towards each other from angularly remote regions in said recess and being mutually engageable by displacement of at least one of the members substantially in the direction of said central axis, the top wall of said recess being deformable in said axial direction to cause said displacement.
Claim 15
Dependent Claim
92 words
An electrical switch device comprising, in combination, a carrier, an enclosed recess of annular form on said carrier and the carrier extending at least partly around a space in the region of the central axis of said arcuate form, contact members within said recess projecting towards each other from angularly remote regions in said recess and being mutually engageable by displacement of at least one of the members substantially in the direction of said central axis, the top wall of said recess being deformable in said axial direction to cause said displacement.
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) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |