Patent US3841069A successfully refreshed from Google Patents.
US3841069A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrically driven lawn mower
Assignee: Wolf Geraete GmbH
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Filing: 1973-04-02
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Granted: 1974-10-15
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Expires: 1993-04-02
Abstract
Abstract The specification describes a lawn mower with a control device for changing the drive speed and comprising a stepless means for adjusting the speed of rotation of the electric motor by influencing the exciting circuit and/or the armature circuit.
Inventors
- 👤 M Weck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:19
CPC Classifications
A; A01; A01D; A01D34/00; A01D34/01; A01D34/412; A01D34/42; A01D34/46; A01D34/47; A01D34/475; A01D43/00; A01D43/06; A01D43/063; C; C11; C11D; C11D1/00; C11D1/02; C11D1/34; C11D3/00; C11D3/16; C11D3/36; C11D2111/00; C11D2111/40
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
102 words
A power lawn mower, comprising: cutting parts; ground engaging means comprising a hollow cylinder; an electric motor within said cylinder and connected with said ground engaging means cylinder for driving same; means operatively connecting said ground engaging means and said cutting parts for causing said ground engaging means to drive said cutting parts; a plural position control device connected to said motor for causing stepless variation in the speed of said motor by adjusting the position of said control device; a hand operated and hand engaged clutch connecting between said motor and said ground engaging means; said clutch being within said cylinder.
Claim 2
Dependent Claim
102 words
A power lawn mower, comprising: cutting parts; ground engaging means comprising a hollow cylinder; an electric motor within said cylinder and connected with said ground engaging means cylinder for driving same; means operatively connecting said ground engaging means and said cutting parts for causing said ground engaging means to drive said cutting parts; a plural position control device connected to said motor for causing stepless variation in the speed of said motor by adjusting the position of said control device; a hand operated and hand engaged clutch connecting between said motor and said ground engaging means; said clutch being within said cylinder.
Claim 3
Dependent Claim
22 words
A lawn mower according to claim 1, wherein said mower has a handle mechanically connected with said clutch for causing engagement thereof.
Claim 4
Dependent Claim
41 words
A lawn mower according to claim 2, wherein said control device and said handle are connected to operate together and to operate in a predetermined sequence such that said clutch is engaged and thereafter the speed of said motor is varied.
Claim 5
Dependent Claim
28 words
A lawn mower according to claim 3, wherein said control device operates in the sequence to cause said motor to be switched on before said clutch is engaged.
Claim 6
Dependent Claim
43 words
A lawn mower according to claim 4, wherein both said controL device and said operating handle are connected to operate together and are connected to a twistable grip which has positions thereon arranged in sequence for causing the above recited sequence of operation.
Claim 7
Dependent Claim
41 words
A lawn mower according to claim 5, further comprising: a motion transmitting cable between said grip and said clutch for engaging said clutch and a cable joining said grip and a switch connected to said motor which turns on said motor.
Claim 8
Dependent Claim
22 words
A lawn mower according to claim 1, further comprising a battery within said cylinder, said battery being connected for feeding said motor.
Claim 9
Dependent Claim
27 words
A lawn mower according to claim 1, in which said clutch has an output member connected via spur gearing with an internal crown gear in said cylinder.
Claim 10
Dependent Claim
26 words
A lawn mower according to claim 8, in which an output shaft of said motor has a gear driving said cutting parts via a toothed belt.
Claim 11
Dependent Claim
22 words
A lawn mower according to claim 9, in which an overload clutch is provided between said toothed belt and said cutting parts.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |