Patent US3713255A successfully refreshed from Google Patents.
US3713255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Miniature belt grinder
Assignee: Dynabrade Inc
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Filing: 1971-09-29
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Granted: 1973-01-30
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Expires: 1991-09-29
Abstract
Abstract A hand tool grinder having an endless belt entrained about nonparallel drive and idler pulleys such that the flights thereof pass over a pair of crown-surfaced direction change pulleys featuring the interchangeable mounting of idler pulleys having differing diameters and axial lengths on the end of a pivotally supported arm; the construction of the arm adjustably accommodating for differing idler pulley diameters and belt lengths.
Inventors
- 👤 W Welsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:04
CPC Classifications
B; B24; B24B; B24B23/00; B24B23/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
333 words
A hand tool grinding device having an endless abrasive surfaced belt, drive means, a casing for supporting said drive means, said drive means including a belt driving pulley having its axis of rotation extending generally longitudinally with respect to said casing, an elongate arm mounted on said casIng and projecting longitudinally therefrom, a belt supporting idler pulley mounted on a projecting end of said arm and having its axis of rotation extending generally vertically with respect to said casing, a pair of direction change pulleys mounted on said arm for respectively supporting flights of said belt extending between said drive and idler pulleys, said direction change pulleys having their axes of rotation extending generally transversely of said casing and causing portions of said flights extending between said directIon change pulleys and said idler pulley to undergo a substantially 90* twist and to straddle that portion of said arm projecting from said casing, the improvement wherein: said elongated arm includes a first part pivotally mounted on said casing and mounting said direction change rollers thereon, a second part for mounting said idler pulley, and attachment means for coupling adjacent ends of said parts whereby said parts may be removably interconnected and the lengthwise dimension of said arm may be adjustably varied whereby to adjustably vary the distance between said idler pulley axis and said direction change pulleys, said attachment means including a flange portion projecting lengthwise from one of said adjacent ends to define a clamping surface through which extends at least two threaded openings spaced apart in a direction lengthwise thereof, a slot opening through and extending in a direction lengthwise of the other of said adjacent ends, and at least two fastener devices for releasably clamping said other adjacent end against said clamping surface, said fastener devices having screw threaded shank portions dimensioned to be freely accommodated within said slot and threadably received within said flange openings and enlarged head portions of a diameter in excess of the width of said slot.
Claim 2
Dependent Claim
333 words
A hand tool grinding device having an endless abrasive surfaced belt, drive means, a casing for supporting said drive means, said drive means including a belt driving pulley having its axis of rotation extending generally longitudinally with respect to said casing, an elongate arm mounted on said casIng and projecting longitudinally therefrom, a belt supporting idler pulley mounted on a projecting end of said arm and having its axis of rotation extending generally vertically with respect to said casing, a pair of direction change pulleys mounted on said arm for respectively supporting flights of said belt extending between said drive and idler pulleys, said direction change pulleys having their axes of rotation extending generally transversely of said casing and causing portions of said flights extending between said directIon change pulleys and said idler pulley to undergo a substantially 90* twist and to straddle that portion of said arm projecting from said casing, the improvement wherein: said elongated arm includes a first part pivotally mounted on said casing and mounting said direction change rollers thereon, a second part for mounting said idler pulley, and attachment means for coupling adjacent ends of said parts whereby said parts may be removably interconnected and the lengthwise dimension of said arm may be adjustably varied whereby to adjustably vary the distance between said idler pulley axis and said direction change pulleys, said attachment means including a flange portion projecting lengthwise from one of said adjacent ends to define a clamping surface through which extends at least two threaded openings spaced apart in a direction lengthwise thereof, a slot opening through and extending in a direction lengthwise of the other of said adjacent ends, and at least two fastener devices for releasably clamping said other adjacent end against said clamping surface, said fastener devices having screw threaded shank portions dimensioned to be freely accommodated within said slot and threadably received within said flange openings and enlarged head portions of a diameter in excess of the width of said slot.
Claim 3
Dependent Claim
333 words
A hand tool grinding device having an endless abrasive surfaced belt, drive means, a casing for supporting said drive means, said drive means including a belt driving pulley having its axis of rotation extending generally longitudinally with respect to said casing, an elongate arm mounted on said casIng and projecting longitudinally therefrom, a belt supporting idler pulley mounted on a projecting end of said arm and having its axis of rotation extending generally vertically with respect to said casing, a pair of direction change pulleys mounted on said arm for respectively supporting flights of said belt extending between said drive and idler pulleys, said direction change pulleys having their axes of rotation extending generally transversely of said casing and causing portions of said flights extending between said directIon change pulleys and said idler pulley to undergo a substantially 90* twist and to straddle that portion of said arm projecting from said casing, the improvement wherein: said elongated arm includes a first part pivotally mounted on said casing and mounting said direction change rollers thereon, a second part for mounting said idler pulley, and attachment means for coupling adjacent ends of said parts whereby said parts may be removably interconnected and the lengthwise dimension of said arm may be adjustably varied whereby to adjustably vary the distance between said idler pulley axis and said direction change pulleys, said attachment means including a flange portion projecting lengthwise from one of said adjacent ends to define a clamping surface through which extends at least two threaded openings spaced apart in a direction lengthwise thereof, a slot opening through and extending in a direction lengthwise of the other of said adjacent ends, and at least two fastener devices for releasably clamping said other adjacent end against said clamping surface, said fastener devices having screw threaded shank portions dimensioned to be freely accommodated within said slot and threadably received within said flange openings and enlarged head portions of a diameter in excess of the width of said slot.
Claim 4
Dependent Claim
333 words
A hand tool grinding device having an endless abrasive surfaced belt, drive means, a casing for supporting said drive means, said drive means including a belt driving pulley having its axis of rotation extending generally longitudinally with respect to said casing, an elongate arm mounted on said casIng and projecting longitudinally therefrom, a belt supporting idler pulley mounted on a projecting end of said arm and having its axis of rotation extending generally vertically with respect to said casing, a pair of direction change pulleys mounted on said arm for respectively supporting flights of said belt extending between said drive and idler pulleys, said direction change pulleys having their axes of rotation extending generally transversely of said casing and causing portions of said flights extending between said directIon change pulleys and said idler pulley to undergo a substantially 90* twist and to straddle that portion of said arm projecting from said casing, the improvement wherein: said elongated arm includes a first part pivotally mounted on said casing and mounting said direction change rollers thereon, a second part for mounting said idler pulley, and attachment means for coupling adjacent ends of said parts whereby said parts may be removably interconnected and the lengthwise dimension of said arm may be adjustably varied whereby to adjustably vary the distance between said idler pulley axis and said direction change pulleys, said attachment means including a flange portion projecting lengthwise from one of said adjacent ends to define a clamping surface through which extends at least two threaded openings spaced apart in a direction lengthwise thereof, a slot opening through and extending in a direction lengthwise of the other of said adjacent ends, and at least two fastener devices for releasably clamping said other adjacent end against said clamping surface, said fastener devices having screw threaded shank portions dimensioned to be freely accommodated within said slot and threadably received within said flange openings and enlarged head portions of a diameter in excess of the width of said slot.
References Cited (Backward Citations)
US3427757A
Cited
US3619943A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |