Powered coping saw
OwnerTroyse W. Wardinventor
Life of this patent
Estimating the term…
Abstract
The saw includes a frame having an opening with a pair of proximate and distal blade retaining chucks located on respective sides of the opening. A saw blade is retained between the pair of chucks. A plurality of pulleys are attached in spaced relation to the frame including pulleys on opposed sides of the opening. A flexible band is entrained about each of the plurality of pulleys, with the band having a first end operatively connected to the proximate blade retaining chuck and a second end attached to the distal blade retaining chuck. A reciprocating drive is attached to the proximate blade retaining chuck. The reciprocating drive and the flexible band work in conjunction to pull the blade in opposite directions during each cycle of the drive. An alternative embodiment of the present invention may take the form of a stationary table saw.
Claims18
A hand held powered coping saw comprising:
- a hollow body including a handle;
- an enclosed U-shaped frame having a passage therethrough including a proximate end connected to said body and a distal end;
- a motor having a rotary drive shaft located within said body;
- a reciprocating drive located within said body including a rotary cylindrical cam having an input shaft operably connected to said rotary drive shaft of said motor, said rotary cylindrical cam having a helical bearing surface and a reciprocally driven member having a bearing engaging said helical bearing surface;
- a coping saw blade bridging said proximate and distal ends of said enclosed U-shaped frame including a proximate end operatively connected to said reciprocally driven member and having a distal end;
- a plurality of pulleys rotatably supported within said passage of said enclosed U-shaped frame;
- and
- a flexible band having a proximate end operatively connected to said reciprocally driven member, a mid portion entrained around said pulleys in said passage of said enclosed U-shaped frame and a distal end connected to said distal end of said coping saw blade, whereby said proximate end of said coping saw blade is pushed by said reciprocally driven member and said distal end of said coping saw blade is pulled by said flexible band.
A hand held powered coping saw comprising:
- a body including a handle;
- an enclosed U-shaped frame having a passage therethrough, a proximate end connected to said body and an opposed distal end;
- a motor having a rotary drive shaft located within said body;
- a reciprocating drive operatively connected to said rotary drive shaft having a reciprocating drive shaft;
- a coping saw blade bridging said proximate and distal ends of said enclosed U-shaped frame having a proximate end operatively connected to said reciprocating drive shaft and having a distal end;
- a plurality of pulleys located within said passage of said enclosed U-shaped frame;
- and
- a flexible band having a proximate end operatively connected to said reciprocating drive shaft, a midportion entrained around said pulleys in said enclosed U-shaped frame and a distal end connected to said distal end of said coping saw blade, whereby said proximate end of said coping saw blade is pushed by said reciprocating drive shaft and said distal end of said coping saw blade is pulled by said flexible band.
A powered coping saw comprising:
- a motor having a rotary drive shaft;
- a reciprocating drive including a rotatory cylindrical cam operatively connected to said rotary drive shaft of said motor and having a helical bearing surface and a reciprocally driven member including a rotatable bearing rotatably engaging said helical bearing surface and a first blade retaining chuck;
- a plurality of spaced pulleys;
- a flexible cable including a proximate end connected to said reciprocally driven member, a mid portion entrained around said pulleys and a distal end connected to a second blade chuck opposite to and coaxially aligned with said first blade chuck;
- and
- a coping saw blade having a proximate end connected to said first blade chuck and a distal end connected to said second blade chuck, whereby said proximate end of said coping saw blade is pushed by said reciprocally driven member and said distal end of said blade is pulled by said flexible cable.
Dependencies are inferred from the claim text.