US3704959A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Guards
Assignee: INTERTEC LE QUINTIN A CORP OF FRANCE Ste
•
Filing: 1970-10-13
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Granted: 1972-12-05
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Expires: 1990-10-13
Abstract
Abstract A retractable guard, more particularly for an axially movable cutting tool spindle of a machine tool to prevent ingress of swarf, and consisting of a stainless steel strip wound as a helical spiral with adjacent turns partially overlapping so that the axial movement varies the amount of overlap and the conicity of the guard.
Inventors
- 👤 Ronald John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:21
CPC Classifications
B; B23; B23Q; B23Q11/00; B23Q11/08; B23Q11/0825; Y; Y10; Y10S; Y10S408/00; Y10S408/71; Y10T; Y10T408/00; Y10T408/96; Y10T408/98; Y10T409/00; Y10T409/30; Y10T409/30392
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
129 words
A guard comprising a single elongated strip of material wound in a helical spiral with adjacent turns overlapping to form a cone and slidable one within the other to vary the degree of overlap and conicity of the cone, a first continuous stop disposed on the outer surface of the strip along the trailing edge thereof in the direction of contraction of the guard, and a second continuous stop disposed on the inner surface of the strip along the leading edge thereof, said first and second continuous stops being formed integrally with the strip by folding the long margins of the strip back on to said inner and outer surfaces respectively to form double thicknesses of material, said stops coacting with one another to limit extension of the guard.
Claim 2
Dependent Claim
129 words
A guard comprising a single elongated strip of material wound in a helical spiral with adjacent turns overlapping to form a cone and slidable one within the other to vary the degree of overlap and conicity of the cone, a first continuous stop disposed on the outer surface of the strip along the trailing edge thereof in the direction of contraction of the guard, and a second continuous stop disposed on the inner surface of the strip along the leading edge thereof, said first and second continuous stops being formed integrally with the strip by folding the long margins of the strip back on to said inner and outer surfaces respectively to form double thicknesses of material, said stops coacting with one another to limit extension of the guard.
Claim 3
Dependent Claim
50 words
A guard as claimed in claim 1 wherein said trailing edge and part of said first stop are bent radially outwards to form a continuous lip of double thickness of material, the lip on one turn coacting with the lip on an adjacent turn to limit contraction of the guard.
Claim 4
Dependent Claim
50 words
A guard as claimed in claim 1 wherein one end of the strip is anchored to the housing of an axially-movable cutting tool spindle of a machine tool, and the other end is anchored to stationary structure so that the conicity of the guard is varied as the spindle moves.
Claim 5
Dependent Claim
35 words
A guard as claimed in claim 3 wherein the radially outer end of the strip is pivotally anchored inside a resilient split ring which grips within an aperture in the stationary structure by its resilience.
Claim 6
Dependent Claim
22 words
A guard as claimed in claim 3 wherein the radially inner end of the strip is pivotally anchored to the spindle housing.
References Cited (Backward Citations)
US1659978A
Cited
US1721740A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-05 | 1976-06-05 | 1976-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-05 | 1980-06-05 | 1980-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-05 | 1984-06-05 | 1984-12-05 | $7700.00 | Window Closed / Lapsed |