US4333302A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined A.C./D.C. electric lawn mower
Assignee: Individual
•
Filing: 1981-03-13
•
Granted: 1982-06-08
•
Expires: 2001-03-13
Abstract
Abstract An electric lawn mower including an A.C. motor and a D.C. motor connected through a gearing and clutch arrangement for operation of either motor separately or concurrently. The gearing arrangement includes a mower blade drive gear acted upon by either of the respective driven gears associated with the A.C. and D.C. motors. The mower may be operated by either the A.C. motor or the D.C. motor separately, or by both motors combined to provide increased power to the cutting blade for mowing of dense areas of vegetation.
Inventors
- 👤 Ronald Thomas
- 👤 Donald H. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:18
CPC Classifications
A; A01; A01D; A01D69/00; A01D69/06; A01D34/00; A01D34/01; A01D34/412; A01D34/63; A01D34/76; A01D34/78; A01D69/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
130 words
An electric lawn mower including a housing, and a cutting blade, said mower comprising, an A.C. motor and a D.C. motor mounted adjacent each other within the housing, a driven gear and an engageable clutch assembly associated with each respective motor for selectively imparting rotative movement from each motor to its associated driven gear, a drive gear engaged between said driven gears for interaction therewith, the drive gear being connected to the blade for imparting cutting movement thereto, whereby upon energization of either motor and its associated clutch assembly separately its associated driven gear will impart motion to the drive gear and blade and upon energization of both motors concurrently the combined power of said motors is imparted through their associated driven gears to said drive gear and the blade.
Claim 2
Dependent Claim
130 words
An electric lawn mower including a housing, and a cutting blade, said mower comprising, an A.C. motor and a D.C. motor mounted adjacent each other within the housing, a driven gear and an engageable clutch assembly associated with each respective motor for selectively imparting rotative movement from each motor to its associated driven gear, a drive gear engaged between said driven gears for interaction therewith, the drive gear being connected to the blade for imparting cutting movement thereto, whereby upon energization of either motor and its associated clutch assembly separately its associated driven gear will impart motion to the drive gear and blade and upon energization of both motors concurrently the combined power of said motors is imparted through their associated driven gears to said drive gear and the blade.
Claim 3
Dependent Claim
29 words
An electric lawn mower as claimed in claim 1 in which either of said driven gears may be operated separately or concurrently to impart motion to the drive gear.
Claim 4
Dependent Claim
59 words
As electric lawn mower as claimed in claim 1 in which each clutch assembly includes a driving plate connected directly to its associated motor and a driven plate connected directly to its associated driven gear and means to cause said plates to engage one another to effect movement of said driven gears upon energization of one or both motors.
Claim 5
Dependent Claim
83 words
An electric lawn mower as claimed in claim 3 in which said means to cause said plates to engage one another include a clutch-engagement cable associated with each respective clutch assembly, said cables passing from said clutch assemblies to a handle extending from said housing, and means on said cables to actuate respective switches for each motor, whereby upon movement of said cables the associated switch will be closed to energize the associated motor and engage the plates of the associated clutch assembly.
Claim 6
Dependent Claim
69 words
An electric lawn mower as claimed in claim 3 or 4 in which said means to cause said plates to engage one another include a respective bell crank assembly having rollers adapted to move in a groove provided in one of said plates, said rollers being positioned on an arm member operable to press the rollers against the groove to move the associated plate and thereby engage the clutch.
Claim 7
Dependent Claim
87 words
An electric lawn mower as claimed in claims 1, 2 or 3 including a brake member mounted for interaction with said drive gear, the brake member including a brake disc formed on an actuation shaft passing through the drive gear, means to prevent rotation of the actuation shaft and a brake actuating cable passing from said shaft to a handle extending from said housing, whereby upon movement of said brake actuating cable the brake disc is moved into contact with the drive gear to brake the same.
References Cited (Backward Citations)
US969797A
Cited
US2298135A
Cited
US2417613A
Cited
US2906081A
Cited
US3230695A
Cited
US3142950A
Cited
US3212244A
Cited
US3570227A
Cited
US3500085A
Cited
DE2032695A1
Cited
DE2049609A1
Cited
US3841069A
Cited
US4064680A
Cited
US4195466A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-06-07 | 1985-12-07 | 1986-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-07 | 1989-12-07 | 1990-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-07 | 1993-12-07 | 1994-06-08 | $7700.00 | Window Closed / Lapsed |