Patent US3759115A successfully refreshed from Google Patents.
US3759115A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety foot control
Assignee: Linemaster Switch Corp
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Filing: 1972-04-19
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Granted: 1973-09-18
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Expires: 1992-04-19
Abstract
Abstract A foot control such as a switch or valve of the treadle-operated type is provided with a guard cover inclosing the sides and top of the treadle and a movable abutment or stop normally retaining and locking the treadle in normal elevated unactuated position, the abutment or stop being disengageable by inward movement of a pivoted trip lever disposed at the inner end of the guard cover and treadle for actuation by the toe of the operator and being accessible only by insertion of the foot of the operator between the treadle and guard cover from the outer open end thereof. An additional safety measure may be the use of dual return springs for the treadle and stop.
Inventors
- 👤 A Dibonaventura
- 👤 L Ford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:07
CPC Classifications
G; G05; G05G; G05G1/00; G05G1/58; G05G1/60; H; H01; H01H; H01H21/00; H01H21/02; H01H21/18; H01H21/22; H01H21/24; H01H21/26; Y; Y10; Y10T; Y10T74/00; Y10T74/20; Y10T74/20528; Y10T74/20576; Y10T74/20636; Y10T74/20648
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
105 words
In a foot control of the type having a base and a treadle mounted on the base for movement between a raised and a depressed position, a guard cover extending over the treadle, a retractable stop normally engaging under the treadle to prevent depression of the treadle, and a movable trip plate at the inner end of the treadle engageable by the toe of the operator''s foot when placed between the treadle and guard cover, the trip plate being operatively connected to the stop to remove the stop from beneath the treadle when the trip plate is moved inwardly by the toe of the operator.
Claim 2
Dependent Claim
105 words
In a foot control of the type having a base and a treadle mounted on the base for movement between a raised and a depressed position, a guard cover extending over the treadle, a retractable stop normally engaging under the treadle to prevent depression of the treadle, and a movable trip plate at the inner end of the treadle engageable by the toe of the operator''s foot when placed between the treadle and guard cover, the trip plate being operatively connected to the stop to remove the stop from beneath the treadle when the trip plate is moved inwardly by the toe of the operator.
Claim 3
Dependent Claim
50 words
In a foot control as set forth in claim 1 wherein the treadle is pivotally mounted on the base and the guard cover is in the form of a cowl inclosing the sides and top of the treadle and permitting access to the treadle only from the outer end thereof.
Claim 4
Dependent Claim
49 words
In a foot control as set forth in claim 2 wherein the stop is a bar pivotally mounted at one end on the base for pivoting movement between an upright position engaging under the treadle to prevent depression thereof and an inclined position permitting the treadle to be depressed.
Claim 5
Dependent Claim
62 words
In a foot control as set forth in claim 2 wherein the stop comprises a pair of bars independently mounted on the base for pivoting movement between an upright position engaging under the treadle to prevent depression thereof and a retracted position disengaging the treadle to permit depression thereof, and a separate spring for each bar urging it to said upright position.
Claim 6
Dependent Claim
110 words
In a foot control as set forth in claim 2 wherein the stop comprises at least one bar pivotally mounted on the base for movement between a position engaging underneath a rear edge of the treadle to prevent depression of the treadle, and a rearwardly retracted position disengaging the treadle to permit depression thereof, the trip plate is pivotally mounted on the base for extension upwardly adjacent the said rear edge of the treadle, and the bar is provided with a projection engaging the rear surface of the trip plate to cause the bar to be pivoted to retracted position when the trip plate is moved rearwardly of the treadle.
Claim 7
Dependent Claim
28 words
In a foot control as set forth in claim 5 wherein the treadle is formed of metal which is hardened in the area engaged by the bar stop.
Claim 8
Dependent Claim
55 words
In a foot control as set forth in claim 5 wherein a pair of separate return springs are operatively connected to the treadle for biasing the treadle in an upward direction, each of said springs being of sufficient force to move the treadle to fully raised position independently of the force of the other spring.
Claim 9
Dependent Claim
100 words
In a foot control as set forth in claim 2 wherein the trip plate is pivotally mounted on the base and extends upwardly at the rear of the treadle, and the stop comprises at least one bar pivotally mounted on the base for movement between an upright position engaging under the treadle to prevent depression thereof and a rearwardly pivoted position releasing the treadle for depression thereof, a portion of the bar being engaged behind the trip plate to cause the bar to be pivoted to treadle releasing position when the trip plate is pivoted rearwardly relative to the treadle.
References Cited (Backward Citations)
US2619846A
Cited
US2693716A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |