US4248284A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hand saw with an interchangeable saw blade
Assignee: RAZOR SAW Manufacturing CO Ltd
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Filing: 1979-09-10
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Granted: 1981-02-03
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Expires: 1999-09-10
Abstract
Abstract A hand saw with an interchangeable saw blade comprising a saw blade with a tongue a U-shaped reinforcing member for reinforcing the saw blade and the tongue, and a molded handle including a blade receiving opening. The handle includes a set screw which protrudes into notches formed in the tongue of the blade and the reinforcing member to lock the blade to the handle. The notches in the tongue and the reinforcing member are arranged so that only the notch in the tongue of the blade engages the tip of the set screw, thereby ensuring a firm clamping of the saw blade to the handle. The opening for receiving the tongue of the blade is defined by ribs formed on the handle.
Inventors
- 👤 Masaaki Tomosada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:00
CPC Classifications
B; B23; B23D; B23D49/00; B23D49/10; B23D49/14; B23D51/00; B23D51/08; B23D51/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
261 words
A hand saw with an interchangeable saw blade comprising, in combination: a saw blade with a tongue, said tongue having a notch formed in the edge opposite the back of the tongue; a reinforcing member for increasing the rigidity of said saw blade and said tongue, said reinforcing member having a substantially U-shaped cross section capable of being placed over the back of the saw blade with the inner surface of the bight portion of the "U" in contact with the backs of said tongue and said saw blade and the inner surfaces of the leg portions of the "U" in contact with the side faces of said tongue and said saw blade, said reinforcing member having notches formed in the leg portions of the "U" at a location corresponding to said notch in said tongue; a molded handle having an opening for receiving said tongue of the saw blade with said reinforcing member placed on the tongue and the blade with a close tolerance between the handle and said reinforcing member, said handle including a set screw threadedly engaged with the handle at the location corresponding to said notches in the tongue and the reinforcing member when said tongue and the reinforcing member are fully inserted in said opening, said opening being defined by a plurality of ribs integrally formed with said mold handle, and said notches in said tongue and said reinforcing member being arranged such that when said set screw is thread-inserted into the handle, its inner end engages only said tongue of the blade within said notch.
Claim 2
Dependent Claim
261 words
A hand saw with an interchangeable saw blade comprising, in combination: a saw blade with a tongue, said tongue having a notch formed in the edge opposite the back of the tongue; a reinforcing member for increasing the rigidity of said saw blade and said tongue, said reinforcing member having a substantially U-shaped cross section capable of being placed over the back of the saw blade with the inner surface of the bight portion of the "U" in contact with the backs of said tongue and said saw blade and the inner surfaces of the leg portions of the "U" in contact with the side faces of said tongue and said saw blade, said reinforcing member having notches formed in the leg portions of the "U" at a location corresponding to said notch in said tongue; a molded handle having an opening for receiving said tongue of the saw blade with said reinforcing member placed on the tongue and the blade with a close tolerance between the handle and said reinforcing member, said handle including a set screw threadedly engaged with the handle at the location corresponding to said notches in the tongue and the reinforcing member when said tongue and the reinforcing member are fully inserted in said opening, said opening being defined by a plurality of ribs integrally formed with said mold handle, and said notches in said tongue and said reinforcing member being arranged such that when said set screw is thread-inserted into the handle, its inner end engages only said tongue of the blade within said notch.
Claim 3
Dependent Claim
77 words
A hand saw as claimed in claim 1, wherein said notch in the tongue is of a rectangular shape of a predetermined depth and a predetermined width, said notches in the reinforcing member having depths deeper than that of said notch in the tongue and widths substantially equal to that of said notch in the tongue, and the width of said tongue being substantially equal to the depth of said U-shaped cross section of the reinforcing member.
Claim 4
Dependent Claim
106 words
A hand saw as claimed in claim 1 or 2, wherein said ribs defining said opening for receiving the tongue extend substantially perpendicularly and inwardly from shell walls defining the outer configuration of said handle, and said ribs include at least two higher ribs extending between the two opposing shell walls to define supports for the edges of said tongue and said reinforcing member, and at least two shorter ribs spaced apart from said higher ribs and extending inwardly from said two opposing shell walls in an opposing relationship to define supports for the sides of said tongue and said reinforcing member between their opposing ends.
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) | 1984-02-03 | 1984-08-04 | 1985-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-03 | 1988-08-04 | 1989-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-03 | 1992-08-04 | 1993-02-03 | $7700.00 | Window Closed / Lapsed |