US3965787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Retractable blade guard
Assignee: Individual
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Filing: 1975-12-15
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Granted: 1976-06-29
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Expires: 1995-12-15
Abstract
Abstract A retractable blade guard which protects the operator from the blade of a rotary saw or other cutters. The guard includes two moveable cam-action guard sections of similar design mounted on the opposite ends of a conventional hood guard. Each section includes an obverse leaf rigidly connected to a reverse leaf by a rod and a guard extension. Each guard section moves independently of the other. The guard section rides up, onto and on top of, and down over the fence or the stock as it is being cut in either direction during cross-cutting, mitering or ripping, yet provides optimal coverage of the blade in the cutting zone.
Inventors
- 👤 Eugene W. Plischke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:29
CPC Classifications
B; B27; B27G; B27G19/00; B27G19/02; B27G19/025; Y; Y10; Y10T; Y10T83/00; Y10T83/869; Y10T83/872
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
154 words
A retractable blade guard for use as a lower safety guard of a rotary power cutting tool comprising a guard section and securing means for pivotally mounting the guard section on the hood guard of said cutting tool; the guard section has an obverse leaf, a reverse leaf, a rod and an extension; the obverse leaf is rigidly connected to the reverse leaf in the vicinity of their lowest contact points by the rod and the extension; the guard section is arranged to pivot about an axis which is located beyond the circumference of the cutting tool; the guard section is arranged to shield a portion of the arc of travel of said cutting tool; and the guard section is arranged to automatically adjust itself to the thickness of a stock being cut and remain in contact with the stock being cut to give maximum protection possible during the operation of said cutting tool.
Claim 2
Dependent Claim
154 words
A retractable blade guard for use as a lower safety guard of a rotary power cutting tool comprising a guard section and securing means for pivotally mounting the guard section on the hood guard of said cutting tool; the guard section has an obverse leaf, a reverse leaf, a rod and an extension; the obverse leaf is rigidly connected to the reverse leaf in the vicinity of their lowest contact points by the rod and the extension; the guard section is arranged to pivot about an axis which is located beyond the circumference of the cutting tool; the guard section is arranged to shield a portion of the arc of travel of said cutting tool; and the guard section is arranged to automatically adjust itself to the thickness of a stock being cut and remain in contact with the stock being cut to give maximum protection possible during the operation of said cutting tool.
Claim 3
Dependent Claim
70 words
A retractable blade guard of claim 1, wherein the obverse leaf has a top edge, an outer edge, a cam edge, a bottom edge, an inner edge, and an arcuate slot; reverse leaf has a top edge, an outer edge, a cam edge, an arcuate slot, and an inner edge; reverse leaf is similar to obverse leaf except that it is shortened to clear the motor of the cutting tool.
Claim 4
Dependent Claim
128 words
A retractable blade guard of claim 2, wherein the extension includes an obverse side member, a reverse side member, and a cross member; the obverse side member is connected at one end to the cross member and at the other end to the obverse leaf; the reverse side member is connected at one end to the cross member and at the other end to the reverse leaf; the obverse side member is semispoon shaped while the reverse side member is only slightly so curved; bottom cam edges on the obverse side member and the reverse side member continue the curvature of the cam edges of the obverse leaf and the reverse leaf, respectively, to facilitate the raising of the extension upon a fence or a stock being cut.
Claim 5
Dependent Claim
25 words
A retractable blade guard of claim 3, wherein the securing means engage the arcuate slot to limit the upper and lower travel of the leaves.
Claim 6
Dependent Claim
63 words
A retractable blade guard of claim 1, wherein there are two guard sections in opposite relation to each other; the guard sections are mirror images of each other except that one guard section is made narrower than the other so that it may move within the planes formed by the leaves of the other; and each guard section moves independently of the other.
Claim 7
Dependent Claim
63 words
A retractable blade guard of claim 4, wherein there are two guard sections in opposite relation to each other; the guard sections are mirror images of each other except that one guard section is made narrower than the other so that it may move within the planes formed by the leaves of the other; and each guard section moves independently of the other.
Claim 8
Dependent Claim
48 words
A retractable blade guard of claim 5, wherein the extensions provide additional guarding in the plane of the cutting tool and between the planes of the leaves to increase the protection farther from the cutting zone and provide an opening to permit the use of an anti-kickback device.
Claim 9
Dependent Claim
21 words
A retractable blade guard of claim 3, wherein the rod and cross member of the extension are of a turnbuckle design.
Claim 10
Dependent Claim
68 words
A retractable blade guard of claim 1, wherein the obverse leaf has a top edge, an outer edge, a cam edge, a bottom edge, an inner edge, and an arcuate slot; reverse leaf has an arcuate arm, a bottom edge, an outer edge 28, a cam edge and an arcuate slot; the bottom edge of the reverse leaf is designed to clear the motor of the cutting tool.
Claim 11
Dependent Claim
25 words
A retractable blade guard of claim 9, wherein the securing means engage the arcuate slots to limit the upper and lower travel of the leaves.
References Cited (Backward Citations)
US3913437A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-29 | 1979-12-29 | 1980-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-29 | 1983-12-29 | 1984-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-29 | 1987-12-29 | 1988-06-29 | $7700.00 | Window Closed / Lapsed |