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US3980068A Expired / Lapsed US ⏱️ 0.0 years remaining

Gasoline powered machine having two electric circuit switches

Assignee: Jacobsen Manufacturing Co
•
Filing: 1975-03-25
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Granted: 1976-09-14
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Expires: 1995-03-25
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Abstract

Abstract A gasoline powered machine, shown in the form of a lawn mower, having a gasoline engine, and a mower deck for a housing, and a mower handle, and ground engaging wheels. The engine has the usual electric circuitry connected thereto, and two electric switches are connected with the circuitry for grounding the circuit and thereby stopping operation of the engine when the switches are not being operated, and that is when they are then in a normally-closed position. Therefore, the operator must be in physical contact with either of the two switches to maintain either one in an open position in order to have the gasoline engine operating.

Inventors

  • 👤 Lee L. Karsten
  • 👤 Merlin H. Gandrud

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-04 14:46
CPC Classifications
F; F02; F02B; F02B63/00; F02B63/02; F02D; F02D17/00; F02D17/04; F02B1/00; F02B1/02; F02B1/04; Y; Y10; Y10S; Y10S56/00; Y10S56/15

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 187 words
A gasoline powered machine comprising a gasoline engine, an electric circuit electrically connected to said engine for conducting electrically to said gasoline engine for operation of said gasoline engine, two electric switches electrically connected together in series with said electric circuit, both of said switches including spring means operative in both of said switches and yieldingly urging said switches to the normally closed position and said normally-closed switches being electrically connected with said machine in an electrically grounded connection, whereby said electric circuit is grounded through said switches to thereby interrupt the operative electric connection of said circuit with said engine and thereby require that at least one of said switches be retained in its electrically open position in order to avoid the grounding of said circuit when it is desired that said engine be operating, and both of said switches including actuator means operative on said spring means for overcoming the urging of said spring means to thereby open said switches and allow the operator to hold said actuators against the forces of said spring means to effect positioning said switches in the electrically open positions.
Claim 2
Dependent Claim 187 words
A gasoline powered machine comprising a gasoline engine, an electric circuit electrically connected to said engine for conducting electrically to said gasoline engine for operation of said gasoline engine, two electric switches electrically connected together in series with said electric circuit, both of said switches including spring means operative in both of said switches and yieldingly urging said switches to the normally closed position and said normally-closed switches being electrically connected with said machine in an electrically grounded connection, whereby said electric circuit is grounded through said switches to thereby interrupt the operative electric connection of said circuit with said engine and thereby require that at least one of said switches be retained in its electrically open position in order to avoid the grounding of said circuit when it is desired that said engine be operating, and both of said switches including actuator means operative on said spring means for overcoming the urging of said spring means to thereby open said switches and allow the operator to hold said actuators against the forces of said spring means to effect positioning said switches in the electrically open positions.
Claim 3
Dependent Claim 35 words
The machine as claimed in claim 1, wherein said machine has two operator's stations spaced apart on said machine, and said two switches being disposed on said machine at respective ones of said two stations.
Claim 4
Dependent Claim 58 words
The machine as claimed in claim 1, wherein said machine is a lawn mower having a cutter-supporting member and a handle connected to said member and extending therefrom, one of said switches being mounted on said handle, the other of said switches being mounted on said cutter-supporting member and having its said actuator operable by the operator's foot.

References Cited (Backward Citations)

US3417470A Cited
US3695379A Cited
US3734230A Cited
US3726264A Cited
US3758736A Cited
US3798402A Cited
US3789938A Cited
US3742928A Cited
US3849620A Cited
US3881461A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1979-09-14 1980-03-15 1980-09-14 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1983-09-14 1984-03-15 1984-09-14 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1987-09-14 1988-03-15 1988-09-14 $7700.00 Window Closed / Lapsed

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