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US3684027A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grass edger
Assignee: BLAIR HALL CO Inc
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Filing: 1970-05-01
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Granted: 1972-08-15
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Expires: 1990-05-01
Abstract
Abstract A grass cutting head having a driving shaft mounting axially spaced flange and plate components. Angularly spaced collars are rotatably supported from one side of the flange. A plurality of radially extending nails, serving as cutting bars, are axially removably received in the ends of the collars remote from the plate. An axially mounted coil spring forces the plate component into clamping engagement with the ends of collars remote from the plate so that the nails are retained in the collars. By pulling the plate against the spring, the plate is moved away from the collars thereby exposing the nails. Once exposed, the nails can be removed and replaced. Then, the plate is replaced to its original clamping position.
Inventors
- 👤 Howard H Crawford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:37
CPC Classifications
A; A01; A01D; A01D34/00; A01D34/835; A01D34/84; A01D34/01; A01D34/412; A01D34/42; A01D34/52; F; F16; F16B; F16B2200/00; F16B2200/69; Y; Y10; Y10T; Y10T403/00; Y10T403/34; Y10T403/341; Y10T403/342; Y10T403/61; Y10T83/00; Y10T83/768; Y10T83/929; Y10T83/9372; Y10T83/9457; Y10T83/9464
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
112 words
A cutting assembly comprising a shaft, a hub axially mounted to an outward shaft end, a flange axially attached to the hub, a plate slidably mounted in axial spaced relation to the flange, at least one collar means rotatably clamped between the flange and plate, and a removable cutter bar extending perpendicularly of the shaft and outwardly from the collar means to cut material as the shaft rotates, said collar means comprising a slotted shank for receiving the bar and a ring encircling the shank to prevent the bar from falling out of the shank, whereby sliding displacement of the plate away from the hub allows removal and replacement of the bar.
Claim 2
Dependent Claim
112 words
A cutting assembly comprising a shaft, a hub axially mounted to an outward shaft end, a flange axially attached to the hub, a plate slidably mounted in axial spaced relation to the flange, at least one collar means rotatably clamped between the flange and plate, and a removable cutter bar extending perpendicularly of the shaft and outwardly from the collar means to cut material as the shaft rotates, said collar means comprising a slotted shank for receiving the bar and a ring encircling the shank to prevent the bar from falling out of the shank, whereby sliding displacement of the plate away from the hub allows removal and replacement of the bar.
Claim 3
Dependent Claim
26 words
The structure of claim 3 wherein a bias means mounted to the shaft contacts the plate to cause clamping of the plate against the collar means.
Claim 4
Dependent Claim
158 words
A cutting head for a lawn edger comprising a driving shaft, a hub axially mounted to an outward shaft end, an annular flange axially attached to the hub, an annular plate slidably mounted against the hub and in axial spaced relation to the flange, a plurality of angularly spaced collar means clamped between the plate and flange, removable cutter bars received in respective collar means, said cutter bars extending perpendicularly of the shaft and radially outward of the collar means, each collar means comprising a headed split shank received in a respective aperture formed in the flange, a slit in the shank receiving the cutter bar, and a ring embracing the split shank to selectively retain the cutter bar therein, and means mounted to the driving shaft for biasing the plate against the hub to effect the clamping of the collar means, wherein relief of the biasing means exposes the cutter bars and allows their removal and replacement.
Claim 5
Dependent Claim
158 words
A cutting head for a lawn edger comprising a driving shaft, a hub axially mounted to an outward shaft end, an annular flange axially attached to the hub, an annular plate slidably mounted against the hub and in axial spaced relation to the flange, a plurality of angularly spaced collar means clamped between the plate and flange, removable cutter bars received in respective collar means, said cutter bars extending perpendicularly of the shaft and radially outward of the collar means, each collar means comprising a headed split shank received in a respective aperture formed in the flange, a slit in the shank receiving the cutter bar, and a ring embracing the split shank to selectively retain the cutter bar therein, and means mounted to the driving shaft for biasing the plate against the hub to effect the clamping of the collar means, wherein relief of the biasing means exposes the cutter bars and allows their removal and replacement.
Claim 6
Dependent Claim
34 words
The structure of claim 5 together with a setscrew threadingly received in each ring and engaging a head of a cutter bar in the shank to maintain the radial position of the cutter bar.
Claim 7
Dependent Claim
103 words
A supporting collar for removably supporting a rod-like cutting element having a headed end on a rotary head, comprising a shank having mounting means on one end thereof and a longitudinal slot therein extending inwardly from the other end thereof to receive a radially outwardly extending cutting element therein, an annular ring having a longitudinal slot therein extending inwardly from one end thereof, said ring encircling said shank with their respective slots in alignment and with the headed end of said cutting element disposed between said ring and a peripheral surface of said shank and means to secure said cutting element in place.
Claim 8
Dependent Claim
103 words
A supporting collar for removably supporting a rod-like cutting element having a headed end on a rotary head, comprising a shank having mounting means on one end thereof and a longitudinal slot therein extending inwardly from the other end thereof to receive a radially outwardly extending cutting element therein, an annular ring having a longitudinal slot therein extending inwardly from one end thereof, said ring encircling said shank with their respective slots in alignment and with the headed end of said cutting element disposed between said ring and a peripheral surface of said shank and means to secure said cutting element in place.
Claim 9
Dependent Claim
79 words
The structure as defined in claim 5 wherein said shank includes a recess communicating with said slot receiving the headed end of the cutting element, screw means extending through the ring into the recess for securing the headed end of the cutting element in place, said mounting means including a headed end on said shank in spaced relation to the ring thereby defining an annular groove for rotatably mounting the collar on a rotary plate of a rotary head.
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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) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |