US4172322A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary cutting assembly
Assignee: White Consolidated Industries Inc
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Filing: 1978-02-27
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Granted: 1979-10-30
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Expires: 1998-02-27
Abstract
Abstract An improved cutting assembly for rotary lawn mowers, edgers, trimmers or the like, including a body member arranged for rotating about an axis normal with the cutting plane. At least two cutting lines are attached to the body member on a compound spool for rotation therewith in the cutting plane. The invention includes means for detachably securing the lines to the body member and for storing a supply of the line on the spool so that the line may be paid out as the working portions of the line become shortened through wear. The cutting lines are preferably nonmetallic so as to reduce the hazardous condition which would otherwise be present for the operator and still provide an apparatus which will cut with great efficiency and safety. This application is a division of U.S. Ser. No. 801,536, filed May 31, 1977, which in turn is a division of U.S. Ser. No. 706,623, filed July 19, 1976, and now abandoned.
Inventors
- 👤 George C. Ballas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:55
CPC Classifications
A; A01; A01D; A01D34/00; A01D34/01; A01D34/412; A01D34/416; A01D34/4165
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
241 words
In an apparatus for cutting vegetation having a cutting head adapted for rotation upon a drive shaft about an axis to extend radially from said head one or more flexible non-metallic cutting lines into a cutting plane relatively normal to the axis of rotation of the cutting head, the improvement in said cutting head comprising: (a) a housing having a cylindrical sidewall and a first face mounted upon the drive shaft, said cylindrical sidewall defining a open-ended cavity formed coaxially in the housing at its second face; (b) aperture means in the cylindrical sidewall and having spaced-apart curvilinear wall portions extending in parallel axially into said housing from said second face; (c) metallic bearing means mounted on said aperture means, said bearing means provided by a bearing element comprising a relatively thin metal saddle-shaped insert, said insert having a rounded central section with a pair of spaced parallel side members with curvilinear configuration extending normally from said central section, and said insert slidably press-fitted into said aperture means with said side members residing with said curvilinear configuration conforming to said curvilinear wall portions; (d) a spool rotatably mounted in said cavity and carrying a supply of cutting line with its free end extending radially outwardly through said aperture means into the cutting plane; and (e) a cover member releasably secured to said housing at the second face for enclosing said cavity and securing said bearing means and spool in operative positions.
Claim 2
Dependent Claim
241 words
In an apparatus for cutting vegetation having a cutting head adapted for rotation upon a drive shaft about an axis to extend radially from said head one or more flexible non-metallic cutting lines into a cutting plane relatively normal to the axis of rotation of the cutting head, the improvement in said cutting head comprising: (a) a housing having a cylindrical sidewall and a first face mounted upon the drive shaft, said cylindrical sidewall defining a open-ended cavity formed coaxially in the housing at its second face; (b) aperture means in the cylindrical sidewall and having spaced-apart curvilinear wall portions extending in parallel axially into said housing from said second face; (c) metallic bearing means mounted on said aperture means, said bearing means provided by a bearing element comprising a relatively thin metal saddle-shaped insert, said insert having a rounded central section with a pair of spaced parallel side members with curvilinear configuration extending normally from said central section, and said insert slidably press-fitted into said aperture means with said side members residing with said curvilinear configuration conforming to said curvilinear wall portions; (d) a spool rotatably mounted in said cavity and carrying a supply of cutting line with its free end extending radially outwardly through said aperture means into the cutting plane; and (e) a cover member releasably secured to said housing at the second face for enclosing said cavity and securing said bearing means and spool in operative positions.
Claim 3
Dependent Claim
22 words
The cutting head of claim 1 wherein said aperture means are provided as a pair of diametrically opposed, spaced-apart curvilinear wall portions.
Claim 4
Dependent Claim
36 words
The cutting head of claim 1 wherein said insert has its central section formed with a curvilinear configuration and resting in abutment with a like curvilinear surface configuration provided in said aperture means in said housing.
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) | 1982-10-29 | 1983-04-30 | 1983-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-29 | 1987-04-30 | 1987-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-29 | 1991-04-30 | 1991-10-30 | $7700.00 | Window Closed / Lapsed |