US3877146A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotating blade holder
Assignee: White Consolidated Industries Inc
•
Filing: 1973-11-28
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Granted: 1975-04-15
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Expires: 1993-11-28
Abstract
Abstract A single-piece, resilient holder for rotating blades, for use in such devices as rotary grass trimmers and the like, having a diametral slot across one end to receive a blade with a central hole for engaging a central stud on the holder, and having integrally formed, elastically deformable retaining fingers under which the opposite halves of the blade are inserted as the blade is rotated about the stud to reach a locking position. The undersides of the retaining fingers have raised portions to act as detents tending to prevent inadvertent removal of the blade, and a cotter pin may be inserted in the holder to totally prevent movement of the blade from the locking position.
Inventors
- 👤 Charles B Pittinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:49
CPC Classifications
A; A01; A01D; A01D34/00; A01D34/835; A01D34/84; A01D34/01; A01D34/412; A01D34/63; A01D34/73; Y; Y10; Y10S; Y10S30/00; Y10S30/05; Y10S30/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
196 words
A holder for releasably securing a blade to rotational drive means, comprising: a holder body connectable to the rotational drive means and having a generally flat end face for holding the blade; a central stud projecting axially from said end face to engage a central hole in the blade; a pair of resiliently deformable retaining fingers formed integrally with said holder body, oppositely extending across said flat end face in parallel relation with each other and with said end face, and spaced equidistantly from Said central stud to form a recess for receiving the blade in an assembly position; a convex rib under each of said retaining fingers, sized to bear against the blade and thereby bend said retaining fingers on rotation of the blade from the assembly position to a locking position with opposite halves of the blade under said retaining fingers, and to act as a detent to restrain the blade from inadvertent movement from the locking position; and a shoulder formed where each of said fingers joins with said flat end face, said shoulder preventing further movement of the blade beyond the locking position and acting to transmit driving torque to the blade.
Claim 2
Dependent Claim
196 words
A holder for releasably securing a blade to rotational drive means, comprising: a holder body connectable to the rotational drive means and having a generally flat end face for holding the blade; a central stud projecting axially from said end face to engage a central hole in the blade; a pair of resiliently deformable retaining fingers formed integrally with said holder body, oppositely extending across said flat end face in parallel relation with each other and with said end face, and spaced equidistantly from Said central stud to form a recess for receiving the blade in an assembly position; a convex rib under each of said retaining fingers, sized to bear against the blade and thereby bend said retaining fingers on rotation of the blade from the assembly position to a locking position with opposite halves of the blade under said retaining fingers, and to act as a detent to restrain the blade from inadvertent movement from the locking position; and a shoulder formed where each of said fingers joins with said flat end face, said shoulder preventing further movement of the blade beyond the locking position and acting to transmit driving torque to the blade.
Claim 3
Dependent Claim
36 words
A holder as set forth in claim 1, further including a detent pin fitted through a hole in said flat end face, the hole being located adjacent the blade to prevent movement from the locking position.
Claim 4
Dependent Claim
19 words
A holder as set forth in claim 1, wherein said holder is a single-piece molding of a thermoplastic material.
Claim 5
Dependent Claim
136 words
A blade and blade holder combination for use in a rotary grass trimmer, comprising: a flat elongated metal blade having a central hole therethrough and sharpened edges; and a single-piece hub having a generally flat end face, a central stud for engaging said hole, and a pair of resiliently deformable retaining fingers, oppositely extending across said flat end face to secure said blade in a locking position against said flat end face on rotation of said blade about said central hub; said retaining fingers having raised detent buttons on their undersides to bear against said blade and restrain it from inadvertent removal from said hub, and having shoulders formed where said fingers join with said flat end face, to prevent rotation of said blade beyond the locking position and to transmit driving torque to said blade.
Claim 6
Dependent Claim
136 words
A blade and blade holder combination for use in a rotary grass trimmer, comprising: a flat elongated metal blade having a central hole therethrough and sharpened edges; and a single-piece hub having a generally flat end face, a central stud for engaging said hole, and a pair of resiliently deformable retaining fingers, oppositely extending across said flat end face to secure said blade in a locking position against said flat end face on rotation of said blade about said central hub; said retaining fingers having raised detent buttons on their undersides to bear against said blade and restrain it from inadvertent removal from said hub, and having shoulders formed where said fingers join with said flat end face, to prevent rotation of said blade beyond the locking position and to transmit driving torque to said blade.
Claim 7
Dependent Claim
32 words
A combination as set forth in claim 4, further including at least one detent pin fitted in a hole through said hub adjacent said blade to prevent movement from the locking position.
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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) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |