US3890746A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flapper wheel
Assignee: Individual
•
Filing: 1974-06-27
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Granted: 1975-06-24
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Expires: 1994-06-27
Abstract
Abstract Method and apparatus employs pads of multiple abrasive sheets equally spaced on a rotary flapper wheel. The method includes arranging the working edges of the abrasive sheets to be substantially parallel to the direction line of the grinding track operatively created by the contacts between the workpiece and the working edges. The apparatus provides slidably mounted holders for the pads and keyhole-shaped or trapezoidal-shaped grooves for easy insertion and removal of the pad holders.
Inventors
- 👤 Kyuji Saegusa
- 👤 Eitetsu Sonobe
- 👤 Susumu Sudo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:50
CPC Classifications
B; B24; B24D; B24D13/00; B24D13/02; B24D13/06; B24D13/08
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
219 words
A flapper wheel comprising a rotary wheel member having a centrally positioned longitudinal axis, said wheel member having parallel planar sides, said wheel member having a plurality of segmental areas being divided by a plurality of longitudinal grooves circumferentially and equally spaced around its cylindrical surface, the longitudinal grooves being located parallel to the centrally positioned longitudinal axis of the rotary wheel member; a plurality of abrasive pad units, each of which being inserted into one of said longitudinal grooves, each of said abrasive pad units including multiple superimposed sheets of abrasive covered material, the planar surfaces of said superimposed abrasive sheets being arranged substantially parallel to the planar sides of the rotary wheel member, each of said superimposed sheets having an inner clamped end and an outer working end; a plurality of slidably mounted holder means, each of which clamps and maintains together the inner ends of said superimposed abrasive sheets in a laminar relationship to each other with said inner ends being substantially aligned, the outer working end of each of said superimposed abrasive sheets having an arcuate configuration, said arcuate working edges of said superimposed abrasive sheets being arranged substantially parallel to the direction of the grinding track operatively created by the contacts between a workpiece and said arcuate working edges of the superimposed abrasive sheets.
Claim 2
Dependent Claim
219 words
A flapper wheel comprising a rotary wheel member having a centrally positioned longitudinal axis, said wheel member having parallel planar sides, said wheel member having a plurality of segmental areas being divided by a plurality of longitudinal grooves circumferentially and equally spaced around its cylindrical surface, the longitudinal grooves being located parallel to the centrally positioned longitudinal axis of the rotary wheel member; a plurality of abrasive pad units, each of which being inserted into one of said longitudinal grooves, each of said abrasive pad units including multiple superimposed sheets of abrasive covered material, the planar surfaces of said superimposed abrasive sheets being arranged substantially parallel to the planar sides of the rotary wheel member, each of said superimposed sheets having an inner clamped end and an outer working end; a plurality of slidably mounted holder means, each of which clamps and maintains together the inner ends of said superimposed abrasive sheets in a laminar relationship to each other with said inner ends being substantially aligned, the outer working end of each of said superimposed abrasive sheets having an arcuate configuration, said arcuate working edges of said superimposed abrasive sheets being arranged substantially parallel to the direction of the grinding track operatively created by the contacts between a workpiece and said arcuate working edges of the superimposed abrasive sheets.
Claim 3
Dependent Claim
28 words
A flapper wheel as set forth in claim 1 wherein each of said longitudinal grooves has its peripheral entrance of substantially less width than its maximum width dimension.
Claim 4
Dependent Claim
67 words
A flapper wheel as set forth in claim 1 wherein each of said holder means includes at least one movably mounted side plate portion providing in its open position ingress and egress for each of said abrasive pad units in and out of its respective longitudinal groove and preventing axial movement of said respective abrasive pad unit when said side plate portion is in its closed position.
Claim 5
Dependent Claim
22 words
A flapper wheel as set forth in claim 1 wherein each of said longitudinAl grooves has a cross-sectional configuration of a keyhole.
Claim 6
Dependent Claim
48 words
A flapper wheel as set forth in claim 1 wherein each of said longitudinal grooves has a trapezoidal cross section and is of progressively decreasing width from its innermost end adjacent said centrally positioned longitudinal axis to its outermost end at the periphery of said rotary wheel member.
Claim 7
Dependent Claim
33 words
A flapper wheel as set forth in claim 1 wherein each of said multiple superimposed sheets has a U-shaped configuration with the flat part of said letter U constituting the inner edge thereof.
Claim 8
Dependent Claim
80 words
A flapper wheel as set forth in claim 4 wherein the inner portion of said side plate portion of each of said holder means has a keyhole configuration to conform with the keyhole configuration of said respective longitudinal groove for insertion therein and wherein the outer portion adjacent the periphery of said rotary wheel member of said side plate portion of each of said holder means has an enlarged portion for the retention of said respective abrasive pad unit therein.
Claim 9
Dependent Claim
92 words
A flapper wheel as set forth in claim 5 wherein the inner portion adjacent the centrally located hub of said side plate portion of each of said holder means has a trapezoidal cross section to conform with the trapezoidal configuration of said respective longitudinal groove for slidably insertion and removal of said holder means and wherein the outer portion adjacent the periphery of said rotary wheel member of said side plate portion of each of said holder means constitutes an enlarged area for the retention of said respective abrasive pad unit therein.
Claim 10
Dependent Claim
84 words
A flapper wheel as set forth in claim 7 wherein said inner portion of said side plate portion of each of said holder means is hingedly mounted at its innermost edge to provide in its open position a pivotable movement of said side plate portion away from the peripheral of said rotary wheel member and to provide in its closed position ingress and egress to and from the entrance of said respective longitudinal groove for insertion and removal of said respective abrasive pad unit.
Claim 11
Dependent Claim
81 words
A flapper wheel as set forth in claim 9 wherein said holder means has a plurality of upstanding pin members position parallel to said axis of said rotary wheel member and located on said outer portion of said side plate portion of said rotary wheel member, said pin members adapted to be inserted into apertures of both said outer portion of said side plate portion of said holder means and said inner ends of said respective pad of multiple superposed sheets.
References Cited (Backward Citations)
US2819567A
Cited
US3451093A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-23 | 1978-12-23 | 1979-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-23 | 1982-12-23 | 1983-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-23 | 1986-12-23 | 1987-06-24 | $7700.00 | Window Closed / Lapsed |