US3636997A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hacksaw frame
Assignee: Malco Products Inc
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Filing: 1970-06-29
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Granted: 1972-01-25
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Expires: 1990-06-29
Abstract
Abstract A hacksaw frame with a frame arm telescopically adjustable within a socket in a handle assembly, the frame arm being locked in operating position within the socket and a blade simultaneously tensioned by a movable lever on the handle assembly. Moving the lever from an open to a locked position cocks and binds the frame arm within the socket thereby rigidly securing the hacksaw frame in operating position. The purpose of the foregoing abstract is to enable the Patent Office and the public generally, and especially the scientists, engineers, or practitioners in the art who are not familiar with patent or legal terms of phraseology, to determine quickly from a cursory inspection the nature and essence of the technical disclosure of the application. The abstract is neither intended to define the invention of the application, which is measured by claims, nor is it intended to be limiting as to the scope of the invention in any way.
Inventors
- 👤 Mark W Keymer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:22
CPC Classifications
B; B23; B23D; B23D51/00; B23D51/08; B23D51/12; B23D51/125
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
297 words
A hacksaw for a blade comprising: a frame including a forwardly extending frame arm and also including a rearwardly disposed handle connected to the arm, means on the forward end of the frame arm for connection to a blade, the frame having an elongate guide passage adjacent the handle and extending in a fore and aft direction toward said means, the guide passage having a noncircular transverse configuration, an adjustable connector in said guide passage and including a blade mounting slide having the transverse cross section of the guide passage and having attachment means for connection to the blade, the slide projecting forwardly out of the guide passage, and being longitudinally slidable without rotation in the passage, the adjustable connector also including an operating slide in spaced relation with the blade mounting slide, and the connector also including a screw on one of the slides and threaded into the other of the slides for varying the spacing between the slides, and a swingable linkage pivoted on the frame adjacent to the rear end of the guide passage and including a swinging link connected to the operating slide of the connector for producing fore and aft sliding thereof in the guide passage, said linkage being swingable toward and into locked position to move the operating slide rearwardly in the guide passage to a preset blade tensioning position, and said linkage also being alternately swingable away from said locked position and to a release position to move the operating slide forwardly in the guide passage to release tension on the blade and permit removal thereof and to move the blade mounting slide endwise out of the guideway to permit rotation thereof relative to the operating slide to effect adjustment along the screw and thereby accommodate variation in blade lengths.
Claim 2
Dependent Claim
297 words
A hacksaw for a blade comprising: a frame including a forwardly extending frame arm and also including a rearwardly disposed handle connected to the arm, means on the forward end of the frame arm for connection to a blade, the frame having an elongate guide passage adjacent the handle and extending in a fore and aft direction toward said means, the guide passage having a noncircular transverse configuration, an adjustable connector in said guide passage and including a blade mounting slide having the transverse cross section of the guide passage and having attachment means for connection to the blade, the slide projecting forwardly out of the guide passage, and being longitudinally slidable without rotation in the passage, the adjustable connector also including an operating slide in spaced relation with the blade mounting slide, and the connector also including a screw on one of the slides and threaded into the other of the slides for varying the spacing between the slides, and a swingable linkage pivoted on the frame adjacent to the rear end of the guide passage and including a swinging link connected to the operating slide of the connector for producing fore and aft sliding thereof in the guide passage, said linkage being swingable toward and into locked position to move the operating slide rearwardly in the guide passage to a preset blade tensioning position, and said linkage also being alternately swingable away from said locked position and to a release position to move the operating slide forwardly in the guide passage to release tension on the blade and permit removal thereof and to move the blade mounting slide endwise out of the guideway to permit rotation thereof relative to the operating slide to effect adjustment along the screw and thereby accommodate variation in blade lengths.
Claim 3
Dependent Claim
63 words
The hacksaw according to claim 1 and said linkage including a link with a connection to the operating slide and also including a lever with connections to the frame and to said link, the connections being pivots swinging over center through a plane common to all pivot axes to the locked position wherein tension through the slides holds the linkage in locked position.
Claim 4
Dependent Claim
76 words
The hacksaw according to claim 2 wherein the frame arm is tubular and has a straight portion with an open rear end adjacent to the handle to receive and confine a spare blade therein, the lever of the linkage having a cover portion overlying the open rear end of the tubular frame arm and being held thereagainst by the tension on the blade acting through the slides and to hold the pivots in over center position.
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) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |