US3591989A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hand grinding machines
Assignee: SNA Europe Industries AB
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Filing: 1969-02-13
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Granted: 1971-07-13
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Expires: 1989-02-13
Abstract
Abstract A grinding machine wherein a grinding wheel is rotated by a compressed air-driven motor and wherein sound dampening means is formed in a dust shield which surrounds part of the periphery of the grinding wheel and has an air-outlet passage formed between two peripherally extending parts of the dust shield.
Inventors
- 👤 Jorgen Granlie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:52
CPC Classifications
B; B24; B24B; B24B55/00; B24B55/04; B24B55/05; B24B23/00; B24B23/02; B24B23/026
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
232 words
An improvement in hand grinding machines of the type which consists of a motor driven by air under pressure and a grinding wheel rotated by said motor and partly surrounded about its periphery by a dust shield, the improvement being characterized in that the dust shield consists of an outer end and an inner wall which between them form a chamber having one or more outlet openings situated at the periphery of the grinding wheel and adapted to direct the outgoing air away from the motor side of he machine in a free flow substantially parallel to the line of the axis of rotation of the grinding wheel; and in that the chamber is connected by one or more supply passages to the air outlet of the motor, to lead away air leaving the motor; via said chamber, said chamber being disposed on the motor side of the grinding wheel and presenting in a section behind the line of the rotary axis of the grinding wheel a substantially triangular profile, with one corner situated at a radial distance from the line of the rotation axis of said wheel which is greater than the outer radius of the wheel and defined along adjacent sides by the outer and the inner wall and along the opposing side by a part of the machine body enclosing the shaft connecting the motor and the grinding wheel.
Claim 2
Dependent Claim
232 words
An improvement in hand grinding machines of the type which consists of a motor driven by air under pressure and a grinding wheel rotated by said motor and partly surrounded about its periphery by a dust shield, the improvement being characterized in that the dust shield consists of an outer end and an inner wall which between them form a chamber having one or more outlet openings situated at the periphery of the grinding wheel and adapted to direct the outgoing air away from the motor side of he machine in a free flow substantially parallel to the line of the axis of rotation of the grinding wheel; and in that the chamber is connected by one or more supply passages to the air outlet of the motor, to lead away air leaving the motor; via said chamber, said chamber being disposed on the motor side of the grinding wheel and presenting in a section behind the line of the rotary axis of the grinding wheel a substantially triangular profile, with one corner situated at a radial distance from the line of the rotation axis of said wheel which is greater than the outer radius of the wheel and defined along adjacent sides by the outer and the inner wall and along the opposing side by a part of the machine body enclosing the shaft connecting the motor and the grinding wheel.
Claim 3
Dependent Claim
54 words
The improvement of claim 1, wherein the portion of the shield surrounding a part of the periphery of the grinding wheel presents both the outer and the inner wall, the walls being adapted to form therebetween a substantially continuous gap or series of openings, which comprise the outlet opening or openings from the chamber.
Claim 4
Dependent Claim
87 words
The improvement of claim 2, wherein the inner wall within said portion of the shield is corrugated in a way to present ridges against the outer wall, said ridges abutting and preferably affixed to said outer wall, and wherein the inner and outer wall form between them, in the spaces between the ridges the outlet openings from the chamber in the form of passages, which impart to the outgoing air a direction of movement substantially parallel to the line of the rotary axis of the grinding wheel.
Claim 5
Dependent Claim
55 words
The improvement of claim 1, wherein the supply passage to the chamber is a tube which surrounds the shaft connecting the motor and grinding wheel with a clearance sufficient to allow passage of the air, and wherein at least one opening in the part of the machine body surrounding said shaft communicates with the chamber.
Claim 6
Dependent Claim
84 words
The improvement of claim 4, wherein the tube nearest the grinding wheel is composed of two separable parts, of which one, in the form of an external sleeve, extends somewhat along the inner tube in an axial direction and is securely connected to the radial inner edges of the walls of the shield thereby to support said shield and form the inner of the defining walls of the chamber, while the inner tube extends up to the motor and is connected with its casing.
References Cited (Backward Citations)
US2452268A
Cited
US2462710A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |