US3927447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tire rasp
Assignee: HANS EHGARTNER Firma
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Filing: 1974-10-03
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Granted: 1975-12-23
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Expires: 1994-10-03
Abstract
Abstract A rasp for the scraping of worn rubber tires has a generally cylindrical body composed of a multiplicity of blades peripherally adjoining one another, the blades being sandwiched between a pair of end disks held together by an axial bolt and bridged by axially extending rods which traverse at least two mounting holes in each blade. The blades may have a polygonal shape, with three or more toothed sides, overlapping one another so that one toothed side of each blade comes to lie along the periphery of the body to define part of a cutting surface. Additional apertures in the blades serve for the circulation of air therethrough, these apertures being flanked by lugs integral with the blades which are bent out laterally to form spacers therebetween; the end disks may also be apertured to facilitate air cooling of the body. Each blade tooth is bounded by four concave arcuate edges defining three sharp points, the middle point projecting radialy beyond the two flanking points; each tooth, or each pair of adjacent teeth, is symmetrical about a radial line.
Inventors
- 👤 Karl Willinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:01
CPC Classifications
B; B23; B23D; B23D71/00; B23D71/02; B23D71/025; Y; Y10; Y10T; Y10T407/00; Y10T407/18; Y10T407/181; Y10T407/182; Y10T407/19; Y10T407/1906; Y10T407/1934; Y10T407/1936; Y10T407/1942; Y10T407/1944; Y10T407/23
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
106 words
A tire rasp comprising a generally cylindrical body with a pair of end disks and a multiplicity of sheet-metal blades sandwiched between said disks, each of said blades having at least one toothed side circularly curved with a common radius substantially equaling that of said disks, said blades adjoining each other with said toothed sides thereof centered on the axis of said body to define part of a peripheral cutting surface; the teeth of said blades being each bounded by four concave arcuate edges meeting at three sharp points including a middle point and two flanking points, said middle point projecting radially beyond said flanking points.
Claim 2
Dependent Claim
106 words
A tire rasp comprising a generally cylindrical body with a pair of end disks and a multiplicity of sheet-metal blades sandwiched between said disks, each of said blades having at least one toothed side circularly curved with a common radius substantially equaling that of said disks, said blades adjoining each other with said toothed sides thereof centered on the axis of said body to define part of a peripheral cutting surface; the teeth of said blades being each bounded by four concave arcuate edges meeting at three sharp points including a middle point and two flanking points, said middle point projecting radially beyond said flanking points.
Claim 3
Dependent Claim
46 words
A tire rasp as defined in claim 1 wherein confronting flanking points of adjoining teeth are interconnected by a common arcuate edge with a radius of curvature substantially smaller than the radii of curvature of the edges interconnecting the flanking and middle points of each tooth.
Claim 4
Dependent Claim
22 words
A tire rasp as defined in claim 2 wherein each tooth is symmetrical about a radial line passing through said middle point.
Claim 5
Dependent Claim
38 words
A tire rasp as defined in claim 2 wherein the teeth of each blade are divided into pairs of adjacent teeth symmetrical about a radial line passing through the center of curvature of said common arcuate edge thereof.
Claim 6
Dependent Claim
34 words
A tire rasp as defined in claim 4 wherein the confronting flanking points of any pair of adjacent teeth lie at a greater distance from said axis than the oppositely facing flanking points thereof.
Claim 7
Dependent Claim
53 words
A tire rasp as defined in claim 5 wherein the common arcuate edge interconnecting said confronting points of any pair of adjacent teeth extend over more than three quarters of a circle, the common arcuate edge of the confronting points of adjoining pairs extending over substantially less than three quarters of a circle.
Claim 8
Dependent Claim
33 words
A tire rasp as defined in claim 2 wherein the distance of said middle point from the root of the tooth substantially exceeds twice the radius of curvature of said common arcuate edge.
Claim 9
Dependent Claim
81 words
A tire rasp as defined in claim 1 wherein each of said blades has the general shape of a regular polygon with convex sides, each of said sides being toothed and extending over a fraction of a circle with said common radius, said body being provided with mounting means for detachably securing said blades to one another in overlapping relationship at the outermost corners of their polygons, said mounting means enabling positioning of each blade with any side thereof facing outwardly.
Claim 10
Dependent Claim
24 words
A tire rasp as defined in claim 1 wherein said blades and said disks are provided with apertures for the circulation of cooling air.
Claim 11
Dependent Claim
28 words
A tire rasp as defined in claim 1 wherein said blades are provided with integral lugs laterally projecting therefrom for holding axially adjoining blades separated from one another.
Claim 12
Dependent Claim
112 words
A tire rasp comprising a generally cylindrical body with a pair of end disks; a multiplicity of sheet-metal blades sandwiched between said disks, each of said blades having a circularly curved toothed side centered on the axis of said body to define part of a peripheral cutting surface; and mounting means detachably securing said blades to one another and to said disks; said blades and said disks being provided with apertures for the circulation of cooling air; the teeth of said blades being each bounded by four concave arcuate edges meeting at three sharp points including a middle point and two flanking points, said middle point projecting radially beyond said flanking points.
Claim 13
Dependent Claim
112 words
A tire rasp comprising a generally cylindrical body with a pair of end disks; a multiplicity of sheet-metal blades sandwiched between said disks, each of said blades having a circularly curved toothed side centered on the axis of said body to define part of a peripheral cutting surface; and mounting means detachably securing said blades to one another and to said disks; said blades and said disks being provided with apertures for the circulation of cooling air; the teeth of said blades being each bounded by four concave arcuate edges meeting at three sharp points including a middle point and two flanking points, said middle point projecting radially beyond said flanking points.
Claim 14
Dependent Claim
31 words
A tire rasp as defined in claim 11 wherein said blades are provided with spacing means forming between each pair of axially adjoining blades a clearance communicating with the apertures thereof.
Claim 15
Dependent Claim
18 words
A tire rasp as defined in claim 11 wherein said spacing means are lugs integral with said blades.
Claim 16
Dependent Claim
33 words
A tire rasp as defined in claim 13 wherein said lugs are connected with said blades along parts of the circumferences of said apertures and bent out of the planes of the blades.
Claim 17
Dependent Claim
27 words
A tire rasp as defined in claim 14 wherein said apertures are hexagonal, said lugs being of trapezoidal outline corresponding to half the hexagon of said apertures.
Claim 18
Dependent Claim
19 words
A tire rasp as defined in claim 13 wherein said lugs lie substantially in radial planes of said body.
Claim 19
Dependent Claim
52 words
A tire rasp as defined in claim 12 wherein one of said disks has an inner face with a cylindrically convex curvature and the other of said disks has an inner face with a complementarily concave curvature, said blades forming undulating tiers axially separated by said spacing means between said inner faces.
Claim 20
Dependent Claim
33 words
A tire rasp as defined in claim 11 wherein the apertures of at least one of said disks open skew to said axis in the direction of rotation onto the outer disk face.
Claim 21
Dependent Claim
62 words
A blade for a generally cylindrical tool, comprising a sheet-metal member having at least one side circularly curved about an axis and provided with a series of teeth each bounded in the plane of curvature by four concave arcuate edges meeting at three sharp points including a middle point and two flanking points, said middle point projecting radially beyond said flanking points.
Claim 22
Dependent Claim
62 words
A blade for a generally cylindrical tool, comprising a sheet-metal member having at least one side circularly curved about an axis and provided with a series of teeth each bounded in the plane of curvature by four concave arcuate edges meeting at three sharp points including a middle point and two flanking points, said middle point projecting radially beyond said flanking points.
Claim 23
Dependent Claim
45 words
A blade as defined in claim 19 wherein confronting flanking points of adjoining teeth are interconnected by a common arcuate edge with a radius of curvature substantially smaller than the radii of curvature of the edges interconnecting the flanking and middle points of each tooth.
Claim 24
Dependent Claim
21 words
A blade as defined in claim 20 wherein each tooth is symmetrical about a radial line passing through said middle point.
Claim 25
Dependent Claim
34 words
A blade as defined in claim 20 wherein said teeth are divided into pairs of adjacent teeth symmetrical about a radial line passing through the center of curvature of said common arcuate edge thereof.
Claim 26
Dependent Claim
33 words
A blade as defined in claim 22 wherein the confronting flanking points of any pair of adjacent teeth lie at a greater distance from said axis than the oppositely facing flanking points thereof.
Claim 27
Dependent Claim
52 words
A blade as defined in claim 23 wherein the common arcuate edge interconnecting said confronting points of any pair of adjacent teeth extend over more than three quarters of a circle, the common arcuate edge of the confronting points of adjoining pairs extending over substantially less than three quarters of a circle.
Claim 28
Dependent Claim
32 words
A blade as defined in claim 20 wherein the distance of said middle point from the root of the tooth substantially exceeds twice the radius of curvature of said common arcuate edge.
Claim 29
Dependent Claim
37 words
A blade as defined in claim 20 wherein said member has the general shape of a regular polygon with identically curved convex sides, each of said sides being toothed and extending over a fraction of a circle.
Claim 30
Dependent Claim
20 words
A blade as defined in claim 19 wherein said member is provided with apertures for the circulation of cooling air.
Claim 31
Dependent Claim
26 words
A blade as defined in claim 19 wherein said member is provided with integral lugs laterally projecting therefrom for holding same separated from an adjoining blade.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-22 | 1979-06-23 | 1979-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-22 | 1983-06-23 | 1983-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-22 | 1987-06-23 | 1987-12-23 | $7700.00 | Window Closed / Lapsed |