US3753341A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rake attachment for rotary power mowers
Assignee: Individual
•
Filing: 1972-09-22
•
Granted: 1973-08-21
•
Expires: 1992-09-22
Abstract
Abstract A pair of polyethylene rake units are detachably mounted on the end portions of an elongated member carried at the lower end of the drive shaft of a rotary power mower blade. The embodiments are described, the rake units being held in both instances by channel-shaped retention means. In one embodiment, the holding is achieved by means of a separate channel-shaped adapter which is bolted to the underside of the usual blade attached to the drive shaft, whereas in the other embodiment the blade is removed and a specially configured elongated member is substituted in order to provide the requisite rake unit retention. Use of the adapter lends itself readily to the provision of a vane which produces a continuous trailing region of reduced pressure, thereby enhancing the raking action.
Inventors
- 👤 H Langlie
- 👤 A Berg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:48
CPC Classifications
A; A01; A01D; A01D42/00; A01D42/02; A01D2101/00
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
100 words
A rake device for attachment to an elongated member rotatable by the drive shaft of a rotary power mower comprising a plastic rake unit including an elongated flat strip of lesser length than the elongated member to which it is to be attached, said flat strip being adapted to underlie an end portion of said member, and longitudinally spaced tines integral with said strip and projecting perpendicularly from one side thereof, said tines having a width less than that of said strip at their attached ends adjacent said one side of the strip, said tines tapering toward their free ends.
Claim 2
Dependent Claim
100 words
A rake device for attachment to an elongated member rotatable by the drive shaft of a rotary power mower comprising a plastic rake unit including an elongated flat strip of lesser length than the elongated member to which it is to be attached, said flat strip being adapted to underlie an end portion of said member, and longitudinally spaced tines integral with said strip and projecting perpendicularly from one side thereof, said tines having a width less than that of said strip at their attached ends adjacent said one side of the strip, said tines tapering toward their free ends.
Claim 3
Dependent Claim
28 words
A device in accordance with claim 1 in which said tines taper inwardly with respect to the sides of said strip and inwardly with respect to each other.
Claim 4
Dependent Claim
32 words
A rake device in accordance with claim 2 in which said tines are formed with a plurality of angularly disposed ribs extending along the length thereof to provide a cruciform cross section.
Claim 5
Dependent Claim
26 words
A rake device in accordance with claim 1 including a horizontal rib extending integrally along said one side of the strip and connecting with said tines.
Claim 6
Dependent Claim
30 words
A rake device in accordance with claim 4 in which each tine has at least one rib merging with the said rib extending along said one side of the strip.
Claim 7
Dependent Claim
81 words
A rake device to be rotated by the drive shaft of a rotary lawn mower comprising a generally channel-shaped member including a flat web and downwardly extending side walls having inwardly directed portions forming an elongated opening therebetween, and a rake unit including a strip portion receivable between said side walls in a confronting relation with said web, and a plurality of tines projecting from said strip portion through said opening for performing a raking operation as said drive shaft rotates.
Claim 8
Dependent Claim
81 words
A rake device to be rotated by the drive shaft of a rotary lawn mower comprising a generally channel-shaped member including a flat web and downwardly extending side walls having inwardly directed portions forming an elongated opening therebetween, and a rake unit including a strip portion receivable between said side walls in a confronting relation with said web, and a plurality of tines projecting from said strip portion through said opening for performing a raking operation as said drive shaft rotates.
Claim 9
Dependent Claim
37 words
A rake device in accordance with claim 6 including an obstruction element at the outer end of the web of said channel-shaped member for engaging said strip portion and preventing said unit from being flung centrifugally outwardly.
Claim 10
Dependent Claim
32 words
A rake device in accordance with claim 6 in which a blade is attached to said drive shaft and said channel-shaped member constitutes an adapter attached to the underside of said blade.
Claim 11
Dependent Claim
31 words
A rake device in accordance with claim 6 in Which an elongated member is attached to said drive shaft and said channel-shaped member constitutes an integral portion of said elongated member.
Claim 12
Dependent Claim
17 words
A rake device in accordance with claim 6 in which said rake unit is of plastic material.
Claim 13
Dependent Claim
15 words
A rake device in accordance with claim 10 in which said plastic is linear polyethylene.
Claim 14
Dependent Claim
38 words
A rake device in accordance with claim 6 including a vane element extending downwardly from one of said side walls, said vane element extending beneath the inwardly directed portion at the lower edge of said one side wall.
Claim 15
Dependent Claim
25 words
A rake device in accordance with claim 12 in which said vane element curves downwardly and in a direction away from said inwardly directed portion.
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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) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |