US3648417A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary abrasive device
Assignee: Merit Holding Inc
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Filing: 1969-01-27
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Granted: 1972-03-14
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Expires: 1989-01-27
Abstract
Abstract An improved and specialized type of construction for an abrasive drum of the type in which a plurality of abrasive packs are mounted in uniform circumferential spacing around the entire cylindrical surface of a central hub, the hub being provided with longitudinal mounting slots, one for each pack. The abrasive drum of the invention combines a hub construction in which the slot sidewalls diverge continuously from a relatively wide slot opening, with abrasive packs, each of which is comprised of a number of abrasive strips joined at their base edge to form a substantially flat base seating on the cylindrical surface of the drum; and each pack is provided with a resiliently deformable plastic retainer which is molded in cross section to provide an anchoring rod portion retained in said slot by said slot sidewalls, and a radial web portion extending from said rod into said pack of abrasive strips, said rod having a transverse dimension substantially less than the width of said slot to permit hinge action of said packs on said hub during rotation of said abrasive drum.
Inventors
- 👤 Aleck Block
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:43
CPC Classifications
B; B24; B24D; B24D13/00; B24D13/02; B24D13/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
208 words
An abrasive drum of the type comprised of a plurality of abrasive packs mounted on a central hub, said hub having longitudinal slots circumferentially spaced around its cylindrical surface, one for the anchoring of each of said packs, said improved abrasive drum comprising: a plurality of abrasive packs, one for each of said slots, each of said packs being comprised of a plurality of abrasive strips with their base edges, adjacent said hub, joined, and their outward edges freely opening, said base edges providing in combination a substantially flat base seating on the cylindrical surface of said hub; a retainer of resiliently deformable plastic material, said retainer having a uniform transverse cross section throughout its length, said cross section comprising a rod disposed radially inward from said pack base, and an integral web extending radially outward from said rod into said pack of abrasive strips, said web being integrally attached to said pack along the base edges of said strips; a hub in which said substantially longitudinal slots have openings substantially wider than the transverse dimension of said web, but narrower than the maximum transverse dimension of said rod, and said slots have sidewalls which diverge inwardly from said slot opening to the maximum width of said slot.
Claim 2
Dependent Claim
208 words
An abrasive drum of the type comprised of a plurality of abrasive packs mounted on a central hub, said hub having longitudinal slots circumferentially spaced around its cylindrical surface, one for the anchoring of each of said packs, said improved abrasive drum comprising: a plurality of abrasive packs, one for each of said slots, each of said packs being comprised of a plurality of abrasive strips with their base edges, adjacent said hub, joined, and their outward edges freely opening, said base edges providing in combination a substantially flat base seating on the cylindrical surface of said hub; a retainer of resiliently deformable plastic material, said retainer having a uniform transverse cross section throughout its length, said cross section comprising a rod disposed radially inward from said pack base, and an integral web extending radially outward from said rod into said pack of abrasive strips, said web being integrally attached to said pack along the base edges of said strips; a hub in which said substantially longitudinal slots have openings substantially wider than the transverse dimension of said web, but narrower than the maximum transverse dimension of said rod, and said slots have sidewalls which diverge inwardly from said slot opening to the maximum width of said slot.
Claim 3
Dependent Claim
41 words
An abrasive drum as described in claim 1 in which said rod is circular in cross section, said hub slots are circular in cross section, and said slot opening corresponds to a chord of the circle of said slot cross section.
Claim 4
Dependent Claim
76 words
An abrasive drum as described in claim 1 in which the base of said pack is spaced radially outward from said rod a distance sufficient to permit said pack to swing freely during the rotation of said abrasive drum, between a radial position in which said pack base makes no contact with the cylindrical surface of said hub, and a hinged position in which said pack contacts said hub only on one side of said web.
Claim 5
Dependent Claim
36 words
An abrasive drum as described in claim 1 in which said slot opening is sufficiently wide to permit the partial emergence of said rod radially outward from said slot opening during rotation of said abrasive drum.
Claim 6
Dependent Claim
49 words
An abrasive drum as described in claim 1 in which said hub slots have sidewalls disposed in planes which diverge inwardly from said slot opening; and said rod is circular in cross section and each side of said rod makes a substantially line contact with the adjacent slot sidewall.
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) | 1975-03-14 | 1975-09-13 | 1976-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-14 | 1979-09-13 | 1980-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-14 | 1983-09-13 | 1984-03-14 | $7700.00 | Window Closed / Lapsed |