US3680404A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable pitch sheave
Assignee: Individual
•
Filing: 1970-11-02
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Granted: 1972-08-01
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Expires: 1990-11-02
Abstract
Abstract A variable pitch sheave in which cooperating belt-engaging disks have hubs which have screw threaded interfit. The inner hub and its disk has kerfs defining two hub clamping parts connected by a part of the disk. The outer hub has at least one set screw threaded therein and pressing against the inner hub to serve the dual functions preventing relative rotation of the disks to maintain a selected spaced setting of the disks and clamping the inner hub upon a shaft.
Inventors
- 👤 David Firth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:03
CPC Classifications
F; F16; F16H; F16H55/00; F16H55/32; F16H55/52; F16H55/56; F16H55/566; Y; Y10; Y10T; Y10T403/00; Y10T403/70; Y10T403/7041; Y10T403/7047; Y10T403/7051; Y10T403/7052; Y10T403/7058
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
152 words
A variable pitch sheave comprising a pair of disks having complementary frusto-conical confronting marginal belt-engaging surfaces, an inner externally screw threaded concentric tubular hub projecting from one disk, said one disk and its hub having a concentric bore therethrough for receiving a shaft, an outer concentric hub projecting from the second disk and internally screw threaded to mate with the threads of said inner hub, said inner hub and its disk having an open ended kerf extending therethrough from the outer diameter of said disk to the inner diameter of said hub, said inner hub having a second kerf extending therethrough opposite said first kerf, said kerfs defining two opposed clamping hub parts, said outer hub having a radial screw threaded bore, and set screw means in said bore bearing against said inner hub for causing said hub parts to make clamping contact with a shaft when extending through said shaftreceiving bore.
Claim 2
Dependent Claim
152 words
A variable pitch sheave comprising a pair of disks having complementary frusto-conical confronting marginal belt-engaging surfaces, an inner externally screw threaded concentric tubular hub projecting from one disk, said one disk and its hub having a concentric bore therethrough for receiving a shaft, an outer concentric hub projecting from the second disk and internally screw threaded to mate with the threads of said inner hub, said inner hub and its disk having an open ended kerf extending therethrough from the outer diameter of said disk to the inner diameter of said hub, said inner hub having a second kerf extending therethrough opposite said first kerf, said kerfs defining two opposed clamping hub parts, said outer hub having a radial screw threaded bore, and set screw means in said bore bearing against said inner hub for causing said hub parts to make clamping contact with a shaft when extending through said shaftreceiving bore.
Claim 3
Dependent Claim
46 words
A variable pitch sheave as defined in claim 1, wherein said outer hub has a pair of substantially axially aligned bores each containing a set screw means, said screws means being engageable with opposite clamping parts of said inner hub to urge them toward each other.
Claim 4
Dependent Claim
37 words
A variable pitch sheave as defined in claim 2, wherein each clamping hub part of said inner hub has a set screw means abutment surface interrupting the screw threads thereof and substantially equally spaced from said kerfs.
Claim 5
Dependent Claim
45 words
A variable pitch sheave as defined in claim 2, wherein the kerfs of said inner hub are substantially aligned and each clamping part of said inner hub has a set screw means abutment surface interrupting the threads thereof and substantially parallel to the kerfs thereof.
Claim 6
Dependent Claim
20 words
A variable pitch sheave as defined in claim 1, wherein said second kerf terminates in said disk adjacent said hub.
Claim 7
Dependent Claim
51 words
A variable pitch sheave as defined in claim 1, wherein said inner hub projects from both faces of said one disk and a third disk has an outer concentric tubular internally screw threaded hub carried by the end of said inner hub opposite that carrying the hub of the second disk.
Claim 8
Dependent Claim
78 words
A variable pitch sheave as defined in claim 1, wherein one disk has similar frusto-conical marginal surfaces at opposite sides thereof and inner concentric externally screw threaded hubs projecting from both faces thereof, and a third disk having a frusto-conical marginal surface complementary to a frusto-conical surface of said first disk and an outer internally screw threaded hub mounted on the inner threaded hub of said first disk opposite that which mounts the hub of the second disk.
Claim 9
Dependent Claim
29 words
A variable pitch sheave as defined in claim 7, wherein both of said inner hubs have set screw means abutment surfaces at both of the opposed clamping parts thereof.
Claim 10
Dependent Claim
90 words
A variable pitch sheave comprising a pair of parts each having a tubular hub and a disk, said disks having frusto-conical confronting belt-engaging surfaces, one hub having internal threads receiving and mating with external threads of the other hub, said part which includes said externally threaded hub having an open ended kerf extending from outer to inner diameter thereof, and means carried by said internally threaded hub and bearing on said externally threaded hub to prevent relative rotation of said parts and press said externally threaded hub against a shaft.
Claim 11
Dependent Claim
90 words
A variable pitch sheave comprising a pair of parts each having a tubular hub and a disk, said disks having frusto-conical confronting belt-engaging surfaces, one hub having internal threads receiving and mating with external threads of the other hub, said part which includes said externally threaded hub having an open ended kerf extending from outer to inner diameter thereof, and means carried by said internally threaded hub and bearing on said externally threaded hub to prevent relative rotation of said parts and press said externally threaded hub against a shaft.
Claim 12
Dependent Claim
34 words
A variable pitch sheave as defined in claim 9, wherein the externally threaded hub has a second kerf extending therethrough and cooperating with said first kerf to define a pAir of shaft clamping members.
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) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |