US3591883A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-stage lawn sweeper
Assignee: YARD MAN Inc
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Filing: 1969-03-10
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Granted: 1971-07-13
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Expires: 1989-03-10
Abstract
Abstract A sweeper of the type commonly known as a lawn sweeper utilizing a rotating pickup brush for removing leaves, grass cuttings and debris from a lawn, and throwing the matter swept from the lawn into an impeller, which in turn transfers the sweepings into a hopper. The resultant dual or two-stage transferral of the sweepings from the lawn to the hopper provides improved operating characteristics and improved distribution of the sweepings within the hopper.
Inventors
- 👤 William H Armstrong
- 👤 Jack L Ponkey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:37
CPC Classifications
E; E01; E01H; E01H1/00; E01H1/02; E01H1/04; E01H1/047
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
218 words
A lawn sweeper comprising, in combination, a supporting frame, ground wheels rotatably mounted upon said frame, a hopper defined on said frame having a bottom and a debris retaining wall extending upwardly from said bottom terminating in an upper edge, an inlet defined in said hopper adjacent and above said upper edge, a extending defined on said supporting frame having a portion extending adjacent and above said upper edge defining an outlet communicating with said hopper inlet, said hopper retaining wall being disposed toward said chamber, a rotary sweeper brush rotatably mounted on said frame within said chamber rotatable in a direction to lift debris from the ground into said chamber, a rotatable impeller mounted within said chamber intermediate said brush and said chamber outlet immediately below said chamber portion and adjacent said outlet receiving debris lifted by said brush into said chamber, a baffle defined within said chamber adjacent and above said impeller and substantially tangential to the path of movement of said impeller extending to said chamber portion adjacent said outlet, drive means connected to said brush and impeller rotating said impeller in a direction opposite to that of said brush and in a direction to translate debris received from said brush substantially parallel to said baffle, over said impeller, through said outlet into said hopper.
Claim 2
Dependent Claim
218 words
A lawn sweeper comprising, in combination, a supporting frame, ground wheels rotatably mounted upon said frame, a hopper defined on said frame having a bottom and a debris retaining wall extending upwardly from said bottom terminating in an upper edge, an inlet defined in said hopper adjacent and above said upper edge, a extending defined on said supporting frame having a portion extending adjacent and above said upper edge defining an outlet communicating with said hopper inlet, said hopper retaining wall being disposed toward said chamber, a rotary sweeper brush rotatably mounted on said frame within said chamber rotatable in a direction to lift debris from the ground into said chamber, a rotatable impeller mounted within said chamber intermediate said brush and said chamber outlet immediately below said chamber portion and adjacent said outlet receiving debris lifted by said brush into said chamber, a baffle defined within said chamber adjacent and above said impeller and substantially tangential to the path of movement of said impeller extending to said chamber portion adjacent said outlet, drive means connected to said brush and impeller rotating said impeller in a direction opposite to that of said brush and in a direction to translate debris received from said brush substantially parallel to said baffle, over said impeller, through said outlet into said hopper.
Claim 3
Dependent Claim
30 words
In a lawn sweeper as in claim 1 wherein said sweeper brush includes brush elements having bristles and said impeller includes paddles radially extending from the impeller axis of rotation.
Claim 4
Dependent Claim
51 words
In a lawn sweeper as in claim 1 wherein said chamber includes an upper portion said outlet being defined in said upper portion, and pivot means connecting said hopper to said frame adjacent said chamber outlet whereby said hopper may be pivoted over said frame and chamber to empty said hopper.
Claim 5
Dependent Claim
61 words
In a lawn sweeper as in claim 1 wherein said impeller is located vertically higher than said brush and receives debris from said brush and discharges such debris through said outlet in less than one half of a revolution of said impeller wherein the direction of movement of debris pick up by said brush is only slightly altered by said impeller.
Claim 6
Dependent Claim
45 words
In a lawn sweeper as in claim 1 wherein said drive means includes a first shaft supporting said brush and a second shaft supporting said impeller, a pulley mounted upon each of said shafts and a twisted endless belt mounted upon and interconnecting said pulleys.
References Cited (Backward Citations)
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Cited
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Cited
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Cited
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Cited
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Cited
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Cited
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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) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |