Miter attachment for a power saw

Claim 2

A miter device for a power-operated saw comprising an elongated base having aligned apertures through the opposite lateral sides thereof defining a channel extending transversely through said base, a frame pivotally mounted onto said base and including a pair of spaced-apart strips constructed and arranged for supporting a power saw thereon in projection into said transverse channel for operative lengthwise displacement into the latter from one side to the other of said elongated base, locking means constructed and arranged to releasably lock said frame at a selected angle relative to said elongated base, and a work clamping device constructed and arranged to adjustably clamp a piece of work against said frame and to cooperate with said locking means to lock said frame against rotation relative to said base.

Claim 3

A miter device as defined in claim 1, wherein said frame includes a pair of U-shaped bracket members transversely and upwardly underlying the opposite ends of said strips respectively with the ends of each U-shaped bracket members rigidly secured to the two strips respectively to rigidly connect one to the other and to define apertures arranged to be aligned with said channel for unobstructed passage of the saw from one end to the other of said strips.

Claim 4

A miter device as defined in claim 1, wherein said frame defines a pivot axis, said supporting strips are formed each with an arc-shaped portion concentric with said pivot axis and guiding members are mounted onto said base to operatively adjoin said arc-shaped portions and thereby pivotally restrain said strips onto said base.

Claim 5

A miter device as defined in claim 3, wherein said frame includes substantially semi-circular plates integrally extending from the opposite outer edges of said strips respectively and defining said arc-shaped portions, and said guiding members constitute guide clips mounted onto said base in slidable engagement with said plates.

Claim 6

A miter device as defined in claim 4, further including adjustable guide means mounted onto said strips and constructed and arranged to guide said saw along said strips.

Claim 7

A miter device as defined in claim 5, wherein said adjustable guide means includes a first guide bar fixedly secured onto one of said strips along the outer edge thereof and a second guide bar adjustably secured onto the other of said strips along the outer edge thereof and constructed and arranged for sideways displacement towards and away fRom said first guide bar, whereby to vary the spacing between said guide bars.

Claim 8

A miter device as defined in claim 1, wherein said frame defines an operatively lateral perimeter and is formed with spaced notches along said perimeter and said locking means includes a locking member pivotally mounted onto said base and arranged for pivotal movement towards and away from said perimeter and engagement into one of said notches and a spring connected to said locking member and arranged to bias the latter towards said engagement, whereby to non-rotatably hold said frame at angles of 45* or 90* to said base.

Claim 9

A miter device as defined in claim 7, wherein said locking member constitutes a plate extending upwardly relative to said base, having a manually engageable portion and an upward slot therethrough, a pivot extends transversely of said base through said slot, and one edge of said locking plate is slanted inwardly adjacent said perimeter and is arranged to downwardly and pivotally engage into anyone of said notches under the bias of said spring.

Claim 10

A miter device as defined in claim 1, wherein said work clamping device includes clamping members outwardly projecting relative to said opposite sides respectively of said elongated base and constructed and arranged to selectively clamp a piece of work outwardly along any of said opposite lateral sides.

Claim 11

A miter device as defined in claim 9, wherein said work clamping device includes a handle rotatably mounted on said base and outwardly projecting therefrom for manual operation thereof, a gear rack is geared to said handle to be linearly actuated therefrom, said clamping members include clamping arms and a crossbar is rigidly secured to said clamping arms for pivotal movement therewith and is connected to said gear rack and arranged to be rotated by the latter upon rotation of said handle.

Claim 12

A miter device as defined in claim 10, wherein said frame includes a pair of U-shaped bracket members transversely and upwardly underlying the opposite ends of said strips respectively with the ends of each U-shaped bracket members rigidly secured to the two strips respectively to rigidly connect one to the other and to define apertures arranged to be aligned with said channel for unobstructed passage of the saw from one end to the other of said strips, said frame includes substantially semi-circular plates integrally extending from the opposite outer edges of said strips respectively and defining arc-shaped portions, guide clips are mounted onto said base in slidable engagement with said plates, a first guide bar is fixedly secured onto one of said strips along the outer edge thereof, a second guide bar is adjustably secured onto the other of said strips along the outer edge thereof and constructed and arranged for sideways displacement towards and away from said first guide bar, whereby to vary the spacing between said guide bars, said frame defines an operatively lateral perimeter and is formed with spaced notches along said perimeter, said locking means includes a locking wedge plate extending upwardly relative to said base, having a manually engageable portion, and an upward slot therethrough, a pivot extends transversely of said base through said slot for pivotal movement towards and away from said perimeter, one edge of said locking wedge plate is slanted inwardly adjacent said perimeter and is arranged to downwardly engage into anyone of said notches, a spring is connected to said locking wedge plate and arranged to bias the latter towards said engagement to non-rotatably hold said frame at angles of 45* or 90* to said base, and the latter includes a body of hollow, rectangular, aluminum extrusion having a plurality of miter cuts extending transversely therethrough at angles of 45* and 90* thereto along said channel for the passage of the saw.