US3724815A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hoist operating hand wheel incorporating an overload protection mechanism
Assignee: C KC KINNON CORP
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Filing: 1971-06-03
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Granted: 1973-04-03
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Expires: 1991-06-03
Abstract
Abstract A hoist operating hand wheel including concentric hub and rim portions; the hub portion pivotally supporting three dog-leg shaped arms carrying rollers normally biased by adjustable tension springs into engagement with roller receiving recesses formed in a radially inwardly facing surface of the rim portion. When an attempt is made to raise a load in excess of desired hoist capacity, the rollers are forced to ride out of their associated recesses against the return bias of the tension springs, thereby permitting rotation of the rim portion relative to the hub portion. A single removable cover plate carried by the hub portion affords access for adjusting the tension springs and normally retains the arms and rim portion in assembled position on the hub portion.
Inventors
- 👤 A Parslow
- 👤 H Hawkins
- 👤 R Dick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:02
CPC Classifications
B; B66; B66D; B66D3/00; B66D3/12; B66D3/16; B66D2700/00; B66D2700/02; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18056; Y10T74/18088
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
344 words
A hand wheel having utility in preventing overloading of a load lifting hoist of the type having a drive connection for rotatably supporting the hand wheel, said hand wheel comprising in combination: a hub portion adapted to be supported by said hoist drive connection for rotation about an axis; a rim portion for driving said hub portion for rotation about said axis in opposite hoist load lifting and hoist load lowering directions; bearing means engageable by facing peripheral surfaces of both said rim and hub portions for journaling said rim portion on said hub portion for rotation concentrically outwardly thereof while permitting disassembly of said rim portion from said hub portion upon movement of the former in a direction axially away from said hoist drive connection, said rim portion having an annular flange portion disposed concentrically of said axis and extending in said direction away from said bearing means, said flange portion and said hub portion cooperating to define a cavity opening axially to one side of said hub portion in said direction, and said flange portion defining radially inwardly opening recesses spaced circumferentially of said cavity; at least one arm member; means for supporting said arm member on said hub portion within said cavity for pivotal movement about a pivot axis arranged parallel to said axis; a roller carried on said arm member for rotation about an axis arranged parallel to the pivot axis thereof; spring means for resiliently biasing said arm member to pivot about its pivot axis in a first direction thereby to normally yieldably maintain said roller in one of said recesses for releasably connecting said hub portion to said rim portion for driven rotations therewith; a cover member for closing said cavity and releasably maintaining said rim portion assembled on said hub portion; and means for removably fixing said cover member to said hub portion adjacent said one side to extend radially of said axis into engagement with said flange portion, whereby to releasably maintain said rim portion assembled on said hub portion in association with said bearing means.
Claim 2
Dependent Claim
344 words
A hand wheel having utility in preventing overloading of a load lifting hoist of the type having a drive connection for rotatably supporting the hand wheel, said hand wheel comprising in combination: a hub portion adapted to be supported by said hoist drive connection for rotation about an axis; a rim portion for driving said hub portion for rotation about said axis in opposite hoist load lifting and hoist load lowering directions; bearing means engageable by facing peripheral surfaces of both said rim and hub portions for journaling said rim portion on said hub portion for rotation concentrically outwardly thereof while permitting disassembly of said rim portion from said hub portion upon movement of the former in a direction axially away from said hoist drive connection, said rim portion having an annular flange portion disposed concentrically of said axis and extending in said direction away from said bearing means, said flange portion and said hub portion cooperating to define a cavity opening axially to one side of said hub portion in said direction, and said flange portion defining radially inwardly opening recesses spaced circumferentially of said cavity; at least one arm member; means for supporting said arm member on said hub portion within said cavity for pivotal movement about a pivot axis arranged parallel to said axis; a roller carried on said arm member for rotation about an axis arranged parallel to the pivot axis thereof; spring means for resiliently biasing said arm member to pivot about its pivot axis in a first direction thereby to normally yieldably maintain said roller in one of said recesses for releasably connecting said hub portion to said rim portion for driven rotations therewith; a cover member for closing said cavity and releasably maintaining said rim portion assembled on said hub portion; and means for removably fixing said cover member to said hub portion adjacent said one side to extend radially of said axis into engagement with said flange portion, whereby to releasably maintain said rim portion assembled on said hub portion in association with said bearing means.
Claim 3
Dependent Claim
41 words
A hand wheel according to claim 1, wherein said means for supporting said arm member includes a pin shaft, and said cover member additionally serves when fixed to said hub portion to releasably retain said arm member on said pin shaft.
Claim 4
Dependent Claim
108 words
A hand wheel according to claim 1, wherein said hand wheel additionally includes adjustment means for adjusting said spring means to vary the bias thereof, and said spring means is a tension spring having opposite ends thereof connected one to each of said spring adjustment means and said arm, said spring adjustment means including a screw portion threadably received within said hub portion for rotation about an axis essentially parallel to said pivot axis and a spring end attaching portion mounted eccentrically of said screw portion, whereby upon rotation of said screw portion said attaching portion is moved along a path to vary the tension of said spring.
Claim 5
Dependent Claim
76 words
A hand wheel according to claim 1, wherein said hub portion is formed with an opening to accommodate said hoist drive connection to extend axially therethrough, whereby affording access for removably mounting said hub portion on said hoist drive connection from adjacent said one side of said hub portion, said cavity is of an annular configuration, and said cover member is of ring shaped configuration fixed to said hub portion concentrically outwardly of said opening thereof.
Claim 6
Dependent Claim
143 words
A hand wheel according to claim 4, wherein said means for supporting said aRm member includes a pin shaft, and said cover member additionally serves when fixed to said hub portion to releasably retain said arm member on said pin shaft and wherein aid hand wheel additionally includes adjustment means for adjusting said spring means to vary the bias thereof, and said spring means is a tension spring having opposite ends thereof connected one to each of said spring adjustment means and said arm, said spring adjustment means including a screw portion threadably received within said hub portion for rotation about an axis essentially parallel to said pivot axis and a spring end attaching portion mounted eccentrically of said screw portion, whereby upon rotation of said screw portion said attaching portion is moved along a path to vary the tension of said spring.
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) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |