US3722086A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making floor mat switches
Assignee: Lanson Ind Inc
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Filing: 1970-08-21
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Granted: 1973-03-27
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Expires: 1990-08-21
Abstract
Abstract To make a floor mat switch, a large O-ring seal is held out adjacent the periphery of one contact plate and rubber separator discs are cemented to the surface of the plate at evenly spaced intervals. A second contact plate is laid on the O-ring seal and spacer discs and the space between the two plates is evacuated. A vinyl spacer ribbon is wound about the plates. The two plates are then suspended in a composite mold in an oven, centered by the spacer ribbon. Liquid vinyl is pumped into the mold and heat cured about the plates.
Inventors
- 👤 L Wikkerink
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:21
CPC Classifications
H; H01; H01H; H01H3/00; H01H3/02; H01H3/14; H01H3/141; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49105
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
69 words
A process for making a floor mat switch as set forth in claim 1 wherein, said evacuated assembly of contact plates is placed in a mold having an internal configuration corresponding to a desired external shape of a completed floor mat switch; and a polymeric material is injected into said mold about said evacuated assembly of contact plates and said polymerIc material is cured to a solid resilient condition.
Claim 2
Dependent Claim
57 words
A process for making a floor mat switch as set forth in claim 2 wherein, a ribbon of polymeric material is spirally wrapped about said assembled evacuated electrically conductive contact plates before said assembled evacuated electrically conductive contact plates are placed in said mold to properly locate said assembled evacuated electrically conductive contact plates in said mold.
Claim 3
Dependent Claim
37 words
A process for making a floor mat switch as set forth in claim 3 wherein, said ribbon has a generally rectangular cross section and is twisted when it is wound about said evacuated assembly of contact plates.
Claim 4
Dependent Claim
55 words
A process for making a floor mat switch set forth in claim 2 wherein, an electrically conductive tab is fastened to each of said contact plates to project laterally from said contact plates when said contact plates are assembled together; and said evacuated assembly of contact plates are supported in said mold on said tabs.
Claim 5
Dependent Claim
75 words
A process for making a floor mat switch as set forth in claim 5, wherein, said mold is vertically mounted in an oven; said evacuated assembly of contact plates is suspended in said mold from said tabs; said polymeric material is injected into said mold in a liquid form and cured to a solid resilient envelope in said mold; and said mold is opened and a completed floor mat switch is removed from said mold.
Claim 6
Dependent Claim
264 words
A process for making a floor mat switch having a pair of normally spaced apart contact plates encased in an envelope of polymeric material, the process comprising the steps of, selecting a pair of electrically conductive contact plates of length and width sufficient to span a predetermined pedestrian passageway, and of material and thickness such that at least one of said contact plates is resiliently flexible to deform under external pressure into contact with the other of said contact plates when said pair are assembled together in normally spaced apart relationship; placing a plurality of dielectric pads at spaced locations on a surface of a first of said pair of contact plates and placing a sealing band of dielectric material on said surface adjacent to and about said periphery of said first contact plate; assembling a second of said pair of electrically conductive contact plates adjacent to said first electrically conductive contact plate against said sealing band and said dielectric pads in normally spaced apart relationship with said first electrically conductive contact plate to form an assembly of said contact plates; wrapping ribbon of polymeric material about said assembly of contact plates; placing said assembly of contact plates in a mold such that said ribbon locates said assembly of electrically conductive contact plates in predetermined spaced relationship within the inside of said mold; and injecting a polymeric material compatible with said ribbon into said mold about said assembly of electrically conductive contact plates to fuse with said ribbon forming a substantially homogeneous envelope of polymeric material about said assembly of electrically conductive contact plates.
Claim 7
Dependent Claim
37 words
A process for making a floor mat switch as set forth in claim 7 wherein said ribbon has a rectangular cross sectional shape and is twisted to facilitate flow of said polymeric material injected into said mold.
Claim 8
Dependent Claim
28 words
A process for making a floor mat switch as set forth in claim 7 wherein said ribbon is spirally wrapped about said assembly of electrically conductive contact plates.
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) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |