US4373227A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface maintenance equipment
Assignee: Tennant Co
•
Filing: 1980-09-09
•
Granted: 1983-02-15
•
Expires: 2000-09-09
Abstract
Abstract Surface maintenance equipment is disclosed including mechanism for moving an airstream therethrough and a filtering device for cleaning the airstream prior to discharge into the atmosphere. The filtering device includes a conventional filter and a screen. The screen removes larger airborne pieces such as grass clippings.
Inventors
- 👤 Paul W. Kimzey
- 👤 Sherman B. Frederick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:39
CPC Classifications
E; E01; E01H; E01H1/00; E01H1/08; E01H1/0827; E01H1/0836; E01H1/0845
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
113 words
Surface maintenance equipment comprising a body structure supported on a plurality of wheels, a downwardly opening housing defining a pickup chamber, means for storage of dirt and debris, means for moving an airstream through said equipment to assist in transporting debris from said pickup chamber to said storage means, and a filtering assembly for cleaning said airstream before discharge, said filtering assembly including a first screen filter for removing larger airborne debris and a second filter for removing fine dust particles from said airstream, said first screen filter including vibration imparting mechanism for dislodgement of said larger debris and said second filter including vibration imparting mechanism for dislodgement of dirt and debris therefrom.
Claim 2
Dependent Claim
113 words
Surface maintenance equipment comprising a body structure supported on a plurality of wheels, a downwardly opening housing defining a pickup chamber, means for storage of dirt and debris, means for moving an airstream through said equipment to assist in transporting debris from said pickup chamber to said storage means, and a filtering assembly for cleaning said airstream before discharge, said filtering assembly including a first screen filter for removing larger airborne debris and a second filter for removing fine dust particles from said airstream, said first screen filter including vibration imparting mechanism for dislodgement of said larger debris and said second filter including vibration imparting mechanism for dislodgement of dirt and debris therefrom.
Claim 3
Dependent Claim
40 words
The surface maintenance equipment of claim 1 wherein said first screen filter comprises a screen assembly including a frame and screen sheet material supported in said frame, said screen sheet material being of a porosity sufficient to remove grass clippings.
Claim 4
Dependent Claim
18 words
The surface maintenance equipment of claim 2 wherein said vibration imparting mechanism comprises an unbalanced device rotatably driven.
Claim 5
Dependent Claim
21 words
The surface maintenance equipment of claim 3 wherein said means for moving the airstream is disposed upstream of said filtering assembly.
Claim 6
Dependent Claim
21 words
The surface maintenance equipment of claim 3 wherein said means for moving the airstream is disposed downstream of said filtering assembly.
Claim 7
Dependent Claim
15 words
The surface maintenance equipment of claim 3 further comprising power means for driving said wheels.
Claim 8
Dependent Claim
18 words
The surface maintenance equipment of claim 2, wherein said vibration imparting mechanism periodically dislodges accumulated dirt and debris.
Claim 9
Dependent Claim
130 words
Surface maintenance equipment comprising a body structure supported on a plurality of wheels, a downwardly opening housing defining a pickup chamber, means for storage of dirt and debris, means for moving an airstream through said equipment to assist in transporting dirt and debris from said pickup chamber to said storage means, and a filtering assembly for cleaning said airstream before discharge, said filtering assembly including a screen filter structure for removing larger airborne debris and permit fine particles to pass therethrough, said screen filter structure having a vibration imparting mechanism for dislodging said larger airborne debris from said screen structure, said filtering assembly further including a second filter for removing fine dust particles, said second filter having a vibration imparting mechanism for dislodging accumulated dirt and debris from said filter.
Claim 10
Dependent Claim
130 words
Surface maintenance equipment comprising a body structure supported on a plurality of wheels, a downwardly opening housing defining a pickup chamber, means for storage of dirt and debris, means for moving an airstream through said equipment to assist in transporting dirt and debris from said pickup chamber to said storage means, and a filtering assembly for cleaning said airstream before discharge, said filtering assembly including a screen filter structure for removing larger airborne debris and permit fine particles to pass therethrough, said screen filter structure having a vibration imparting mechanism for dislodging said larger airborne debris from said screen structure, said filtering assembly further including a second filter for removing fine dust particles, said second filter having a vibration imparting mechanism for dislodging accumulated dirt and debris from said filter.
References Cited (Backward Citations)
US1560612A
Cited
US3585788A
Cited
US3540073A
Cited
US3639940A
Cited
US4006511A
Cited
US4206530A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-02-14 | 1986-08-16 | 1987-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-14 | 1990-08-16 | 1991-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-14 | 1994-08-16 | 1995-02-15 | $7700.00 | Window Closed / Lapsed |