US3623518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antisplinter insert for portable saws
Assignee: Porter Cable Corp
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Filing: 1970-03-09
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Granted: 1971-11-30
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Expires: 1990-03-09
Abstract
Abstract A portable circular saw antisplintering insert for removable association with the shoe plate of the saw including a plate formed with an edge opening slot and designed to firmly bear upon the upper surface of a workpiece in close adjacent relation to the sides and tips of the emerging cutting teeth to prevent tearing and chipping of the upper lamination or formica or like covering of the workpiece and assure a clean finish cutting of such workpieces.
Inventors
- 👤 Joseph P Nicotra
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:01
CPC Classifications
B; B27; B27G; B27G19/00; B27G19/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
235 words
In a portable power-driven circular saw of the type having a base assembly including a shoe plate, a circular saw blade protruding downwardly beyond the shoe plate, a motor housing mounting a motor drive connected to said saw blade, and means on said shoe plate and said motor housing for mounting said motor, motor housing and blade, the improvement which comprises: a. an antisplintering insert in the form of a plate member having an edge opening slot dimensioned to closely receive the peripheral toothed edge of said saw blade and delimited along its opposite sides and closed end by workpiece-engaging bearing surfaces, said plate member comprising a main body portion of generally U-shaped configuration in plan and said workpiece engaging bearing surfaces comprising a depressed area lying within the arms of the U-shaped body configuration with said slot therein; and b. means, including a plate extension comprising a pair of spaced, laterally directed arms lying in the plane of said body portion, and mating clamp means on said shoe plate adjacent the leading edge of said circular saw blade for removably clamping said insert to said shoe plate in operative correlation to said leading edge of said circular saw, said mating clamp means comprising a stud on said shoe plate and an associated clamp nut whereby said insert may be clampingly engaged with the upper face of said shoe plate upon tightening said clamp screw.
Claim 2
Dependent Claim
235 words
In a portable power-driven circular saw of the type having a base assembly including a shoe plate, a circular saw blade protruding downwardly beyond the shoe plate, a motor housing mounting a motor drive connected to said saw blade, and means on said shoe plate and said motor housing for mounting said motor, motor housing and blade, the improvement which comprises: a. an antisplintering insert in the form of a plate member having an edge opening slot dimensioned to closely receive the peripheral toothed edge of said saw blade and delimited along its opposite sides and closed end by workpiece-engaging bearing surfaces, said plate member comprising a main body portion of generally U-shaped configuration in plan and said workpiece engaging bearing surfaces comprising a depressed area lying within the arms of the U-shaped body configuration with said slot therein; and b. means, including a plate extension comprising a pair of spaced, laterally directed arms lying in the plane of said body portion, and mating clamp means on said shoe plate adjacent the leading edge of said circular saw blade for removably clamping said insert to said shoe plate in operative correlation to said leading edge of said circular saw, said mating clamp means comprising a stud on said shoe plate and an associated clamp nut whereby said insert may be clampingly engaged with the upper face of said shoe plate upon tightening said clamp screw.
Claim 3
Dependent Claim
67 words
The improvement of claim 1 wherein said shoe plate is provided with at least one abutment tab to contact the rear edge of said insert adjacent the leading edge of said saw blade to prevent angular shifting of said insert around said stud into contact with the saw blade due to the reaction forces acting on the insert as a result of its engagement with the workpiece.
Claim 4
Dependent Claim
38 words
The improvement of claim 1 wherein said abutment tab includes a hook extension overlying a portion of said insert rear edge to prevent upward deflection of said insert relative to its clamped end due to said reaction forces.
Claim 5
Dependent Claim
147 words
An antisplintering insert for a portable, power-driven circular saw having a base assembly including a shoe plate adapted to slidably support the saw upon the upper face of a workpiece and a circular saw blade extending below the shoe plate and having peripherally disposed saw teeth, comprising a main support member having a mounting extension adapted for removable attachment to the upper surface of the shoe plate and a dependent plate portion defining a workpiece engaging bearing surface in the plane of the lower surface of the shoe plate formed with an edge opening slot disposed to straddle the peripherally disposed saw teeth, said slot defining portions of said dependent plate surface being disposed to closely enclose the sides and tips of the saw teeth and have firm bearing contact with the upper surface of the workpiece immediately adjacent the developing kerf formed by the saw blade.
Claim 6
Dependent Claim
147 words
An antisplintering insert for a portable, power-driven circular saw having a base assembly including a shoe plate adapted to slidably support the saw upon the upper face of a workpiece and a circular saw blade extending below the shoe plate and having peripherally disposed saw teeth, comprising a main support member having a mounting extension adapted for removable attachment to the upper surface of the shoe plate and a dependent plate portion defining a workpiece engaging bearing surface in the plane of the lower surface of the shoe plate formed with an edge opening slot disposed to straddle the peripherally disposed saw teeth, said slot defining portions of said dependent plate surface being disposed to closely enclose the sides and tips of the saw teeth and have firm bearing contact with the upper surface of the workpiece immediately adjacent the developing kerf formed by the saw blade.
Claim 7
Dependent Claim
70 words
The antisplintering insert of claim 4 wherein the insert is a one-piece platelike member, said mounting extension comprises a pair of spaced arms extendinG from one side of said platelike member at right angles to said edge opening slot and defining a slot for receiving a clamp screw, and said dependent plate surface comprises a depressed area of said plate formed along the trailing edge of said one-piece platelike member.
Claim 8
Dependent Claim
39 words
The antisplintering insert of claim 5, wherein said one-piece platelike member at the side remote from said one side is formed with an upstanding flange adapted to serve as a finger holding protuberance in assembling and disassembling the insert.
References Cited (Backward Citations)
US2854043A
Cited
US2996089A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |