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US3874151A Expired / Lapsed US ⏱️ 0.0 years remaining

Self-propelled lawn mower

Assignee: Individual
•
Filing: 1974-02-01
•
Granted: 1975-04-01
•
Expires: 1994-02-01
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Abstract

Abstract A self-propelled rotary lawn mower. The drive shaft of the engine is operably connected through a clutch mechanism to the cutting blade and to a belt drive connected the front wheels to drive the mower across the terrain. By disengaging the clutch through manual action of a cable, the driving connection to both the blade and the wheels is stopped, so that the blade will not rotate when the mower is stationary. The housing of the mower includes inner and outer housing sections with the space between the housing sections defining a chamber. The exhaust gases from the engine are directed into the chamber and are discharged from the chamber adjacent the grass discharge outlet in the housing. Directing the exhaust gases through the internal housing chamber substantially decreases the noise level of the mower. The four wheels of the mower are adapted to be raised and lowered in unison by single lever control to thereby vary the height of the blade above the ground. A handle assembly is utilized which is adapted to fold for storage so that the entire handle is located within the perimeter of the housing to facilitate handling and shipment of the mower.

Inventors

  • 👤 Lester H Seifert
  • 👤 Raymond P Powers
  • 👤 William M Schmidt
  • 👤 Stanley E Thorwaldsen
  • 👤 Frederick W Smith
  • 👤 David C Mcelroy
  • 👤 Roy P Dunton

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-03 15:17
CPC Classifications
A; A01; A01D; A01D34/00; A01D34/01; A01D34/412; A01D34/63; A01D34/82; A01D2101/00

Claims Analysis

Total Claims: 3
Claim 1
Independent Claim 242 words
A self-propelled rotary lawn mower, comprising a housing having a discharge outlet for the discharge of grass clippings, engine means mounted on the housing, blade means located within the housing and operably connected to the engine means, a pair of first drive wheels, a horizontal first shaft carried by the housing and operably connected to said engine means, a pinion connected to an end of the first shaft, a gear mounted on one of said first drive wheels and engaged with the pinion whereby rotation of the shaft and pinion will rotate the first drive wheel, said pinion being spaced radially fron the axis of the first drive wheel, an axle to mount the first drive wheel for rotation about its axis, a crank arm pivotally connected to the shaft adjacent the first drive wheel, said axle being pivotally connected to one end of said crank arm, a pair of second wheels, a second shaft carried by the housing and connected to said second wheels, each end of the second shaft being provided with an offset crank portion terminating in a horizontal end that carries the respective second wheel, a connecting member interconnecting the second shaft and the opposite end of said crank arm, and actuating means for moving said connecting member to thereby simultaneously pivot said first wheels about the axis of said first shaft and pivot said second wheels about the axis of the central portion of said second shaft.
Claim 2
Dependent Claim 242 words
A self-propelled rotary lawn mower, comprising a housing having a discharge outlet for the discharge of grass clippings, engine means mounted on the housing, blade means located within the housing and operably connected to the engine means, a pair of first drive wheels, a horizontal first shaft carried by the housing and operably connected to said engine means, a pinion connected to an end of the first shaft, a gear mounted on one of said first drive wheels and engaged with the pinion whereby rotation of the shaft and pinion will rotate the first drive wheel, said pinion being spaced radially fron the axis of the first drive wheel, an axle to mount the first drive wheel for rotation about its axis, a crank arm pivotally connected to the shaft adjacent the first drive wheel, said axle being pivotally connected to one end of said crank arm, a pair of second wheels, a second shaft carried by the housing and connected to said second wheels, each end of the second shaft being provided with an offset crank portion terminating in a horizontal end that carries the respective second wheel, a connecting member interconnecting the second shaft and the opposite end of said crank arm, and actuating means for moving said connecting member to thereby simultaneously pivot said first wheels about the axis of said first shaft and pivot said second wheels about the axis of the central portion of said second shaft.
Claim 3
Dependent Claim 34 words
The lawn mower of claim 1, and including locking means for locking the actuating member in a given position to thereby lock all four wheel at a given height with respect to the housing.

References Cited (Backward Citations)

US2730374A Cited
US2760589A Cited
US2941610A Cited
US3093947A Cited
US3256681A Cited
US3677574A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1978-03-31 1978-09-30 1979-04-01 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1982-03-31 1982-09-30 1983-04-01 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1986-03-31 1986-09-30 1987-04-01 $7700.00 Window Closed / Lapsed

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