US3673777A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blade mounting means
Assignee: Black and Decker Corp
•
Filing: 1970-09-03
•
Granted: 1972-07-04
•
Expires: 1990-09-03
Abstract
Abstract A coupling assembly for attaching a plastic part to a metal shaft, such as a blade holding hub to an electric motor shaft in a grass trimming device. The coupling comprises a plurality of knurled portions spaced along the shaft at the location of the plastic part. The plastic part is provided with a bore equal in diameter to that of the shaft and is press fitted over the shaft so that the knurled portions compress the plastic. The portion of the plastic which passes beyond the knurled portions and between the knurled portions returns via elastic cold flow to a diameter less than that of the knurled portions so that the plastic part is axially locked by multiple surfaces.
Inventors
- 👤 Edwin J Weber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:27
CPC Classifications
A; A01; A01D; A01D34/00; A01D34/01; A01D34/412; A01D34/63; A01D34/82; F; F16; F16D; F16D1/00; F16D1/06; F16D1/08; F16D1/0852; F16D1/0858; A01D2101/00; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49833; Y10T29/49835; Y10T29/49945; Y10T403/00; Y10T403/49; Y10T403/4966
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
113 words
In a grass cutting device including an electric motor, a shaft driven by said motor and a blade coupled to said shaft for rotation therewith, the improvement comprising: a plurality of knurled portions axially spaced along said shaft and spaced from the end thereof; a pliable plastic insulating hub member for receiving a blade mounting means thereon; said hum member having a central bore therein of substantially the same diameter as said shaft and fitted tightly thereto; said knurled portions extending into said hub member and said hub member extending close to said shaft between said knurled portions; whereby said hub member is retained against rotational or axial movement relative to said shaft.
Claim 2
Dependent Claim
113 words
In a grass cutting device including an electric motor, a shaft driven by said motor and a blade coupled to said shaft for rotation therewith, the improvement comprising: a plurality of knurled portions axially spaced along said shaft and spaced from the end thereof; a pliable plastic insulating hub member for receiving a blade mounting means thereon; said hum member having a central bore therein of substantially the same diameter as said shaft and fitted tightly thereto; said knurled portions extending into said hub member and said hub member extending close to said shaft between said knurled portions; whereby said hub member is retained against rotational or axial movement relative to said shaft.
Claim 3
Dependent Claim
24 words
The device claimed in claim 1 wherein the outer diameter of said knurled portions is greater than the inner diameter of said hub member.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |