US3918239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lawn mowers
Assignee: Ransomes Sims and Jeffries Ltd
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Filing: 1974-03-20
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Granted: 1975-11-11
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Expires: 1994-03-20
Abstract
Abstract A lawn mower of the kind having reel-type cutting units each supported by its connection to the frame of the mower and by a ground-engaging element positioned to the rear of the bottom cutting blade of unit and each provided with means for adjusting the vertical position of the ground-engaging element relative to the bottom blade to vary the height of cut of the unit. Each cutting unit is provided with side skids to prevent scalping by the unit, and the vertical position of the side skids relative to the bottom blade is adjustable with the height-of-cut adjusting means to ensure the skids are always the same height above the ground.
Inventors
- 👤 Edward John Aldred
- 👤 Julian Kowalski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:56
CPC Classifications
A; A01; A01D; A01D34/00; A01D34/01; A01D34/412; A01D34/42; A01D34/54; A01D2101/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
179 words
A lawn mower comprising a frame supported on ground-engaging members, and at least one cutting unit having a bOttom cutting blade and a co-operating cutting cylinder, said at least one cutting unit being connected to the frame so as to be movable longitudinally with the frame and being supported by its connection to the frame and by ground-engaging means positioned to the rear of the bottom cutting blade and having height of cut adjustment means for adjusting the vertical position of the ground-engaging means relative to the bottom blade thereby to vary the height of cut of the cutting unit, in which said at least one cutting unit is provided with a pair of longitudinally extending skids mounted one at each side of the cutting unit, and means for adjusting the vertical position of the skids relative to the bottom blade while maintaining constant the angular orientation of each skid relative to the cutting unit, thereby in use to keep constant the height of the skids above level ground for different settings of the height of cut adjustment means.
Claim 2
Dependent Claim
179 words
A lawn mower comprising a frame supported on ground-engaging members, and at least one cutting unit having a bOttom cutting blade and a co-operating cutting cylinder, said at least one cutting unit being connected to the frame so as to be movable longitudinally with the frame and being supported by its connection to the frame and by ground-engaging means positioned to the rear of the bottom cutting blade and having height of cut adjustment means for adjusting the vertical position of the ground-engaging means relative to the bottom blade thereby to vary the height of cut of the cutting unit, in which said at least one cutting unit is provided with a pair of longitudinally extending skids mounted one at each side of the cutting unit, and means for adjusting the vertical position of the skids relative to the bottom blade while maintaining constant the angular orientation of each skid relative to the cutting unit, thereby in use to keep constant the height of the skids above level ground for different settings of the height of cut adjustment means.
Claim 3
Dependent Claim
38 words
A lawn mower as claimed in claim 1, in which the height of cut adjustment means of said at least one cutting unit is adapted simultaneously to adjust the position of the skids relative to the bottom blade.
Claim 4
Dependent Claim
53 words
A lawn mower as claimed in claim 2, in which the ground engaging means is a ground-engaging element supported between two mounting members whose position relative to the bottom blade is adjustable by adjustment of the height of cut adjusting means, and each skid is rigidly fixed to one of the mounting members.
Claim 5
Dependent Claim
86 words
A lawn mower as claimed in claim 3, in which each skid is rigidly fixed at its rear end to one of the mounting members and at its forward end is provided with clamping means for clamping the forward end of the skid to a frame member of the at least one cutting unit, the clamping means being releasable to allow movement of the forward end of the skid relative to the at least one cutting unit on adjustment of the height of cut adjustment means.
Claim 6
Dependent Claim
43 words
A lawn mower as claimed in claim 4, in which the clamping means comprises a vertically elongated slot in an upwardly projecting element fixed to the skid, and a clamping bolt passing through the slot and through a hole in the frame members.
Claim 7
Dependent Claim
60 words
A lawn mower as claimed in claim 3, in which the height of cut adjustment means comprises two plungers each fixed at its lower end to one of the mounting members and slidable vertically in a housing fixed to the frame of the at least one cutting unit, and means for adjusting the position of each plunger in its housing.
Claim 8
Dependent Claim
18 words
A lawn mower as claimed in claim 1, in which the ground-engaging means comprises a horizontally disposed roller.
Claim 9
Dependent Claim
32 words
A lawn mower as claimed in claim 1, in which each longitudinally extending skid has a lower face, the lowermost portion of which extends horizontally when the mower stands on level ground.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |