US3929035A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric control safety mechanism
Assignee: Mail Well Corp
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Filing: 1974-07-26
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Granted: 1975-12-30
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Expires: 1994-07-26
Abstract
Abstract A safety mechanism requiring two hands of an operator before activating a machine or closing an electric circuit. A push button is positioned under a support plate having an opening through which the button can be depressed. A safety plate is slidably mounted under the support plate and over the push button thereby normally closing the opening and preventing the depression of the button. The safety plate is coupled to a spring return means and also to a manually operated handle which pulls the safety plate clear of the opening and permits access to the push button.
Inventors
- 👤 Robert Cohn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:11
CPC Classifications
F; F16; F16P; F16P3/00; F16P3/18; F16P3/20; Y; Y10; Y10T; Y10T74/00; Y10T74/21; Y10T74/2193; Y10T74/2198
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
148 words
In combination with a switch means control station including a start switch for actuating a machine, a two-hand safety mechanism comprising: a support plate secured to said control station and extending over the start switch, said support plate formed with an opening therein disposed over said start switch to enAble an operator to actuate the start switch; a safety plate slidably mounted under said support plate and movable between positions covering and uncovering the opening in the support plate; biasing means for biasing said safety plate to a position covering the opening in said support plate; and a handle means secured to said safety plate in order to enable the operator to overcome said biasing means and move said safety plate with one hand to a position which uncovers said start switch whereby said start switch may then be depressed with the other hand to activate the machine.
Claim 2
Dependent Claim
148 words
In combination with a switch means control station including a start switch for actuating a machine, a two-hand safety mechanism comprising: a support plate secured to said control station and extending over the start switch, said support plate formed with an opening therein disposed over said start switch to enAble an operator to actuate the start switch; a safety plate slidably mounted under said support plate and movable between positions covering and uncovering the opening in the support plate; biasing means for biasing said safety plate to a position covering the opening in said support plate; and a handle means secured to said safety plate in order to enable the operator to overcome said biasing means and move said safety plate with one hand to a position which uncovers said start switch whereby said start switch may then be depressed with the other hand to activate the machine.
Claim 3
Dependent Claim
24 words
A safety mechanism according to claim 1 wherein said safety plate is held adjoining the under surface of said support plate by a bracket.
Claim 4
Dependent Claim
33 words
A safety mechanism according to claim 2 wherein the motion of said safety plate is limited by stops secured to said support plate, said motion being limited to areas under said support plate.
Claim 5
Dependent Claim
12 words
A safety mechanism according to claim 1 wherein the opening is circular.
Claim 6
Dependent Claim
12 words
A safety mechanism according to claim 1 wherein the opening is rectangular.
Claim 7
Dependent Claim
15 words
A safety mechanism according to claim 1 wherein said biasing means is a spring means.
Claim 8
Dependent Claim
27 words
A safety mechanism means according to claim 1 wherein said spring means is a helical spring coupled between portions of the safety plate and the support plate.
Claim 9
Dependent Claim
15 words
A safety mechanism according to claim 1 wherein said handle is a smooth surfaced cylinder.
Claim 10
Dependent Claim
23 words
A safety mechanism according to claim 1 wherein said support plate is flat and is parallel to the surface of the control station.
Claim 11
Dependent Claim
12 words
A safety mechanism according to claim 7 wherein said handle is flattened.
Claim 12
Dependent Claim
15 words
A safety mechanism according to claim 1 wherein a plurality of said switches are provided.
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) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |