Coping saw

Abstract

A coping saw is provided having two spaced-apart rotary actuators supported by a frame. Two saw-blade sections extend between the two rotary actuators and are intended to singularly engage a work piece. The saw is adapted to contain a drive mechanism which is coupled to a first of the two rotary actuators for causing the saw-blade sections to move in at least one direction. At least one guide roller assembly is disposed adjacent each of the two saw-blade sections for providing stability and retaining said two-saw blade sections between said two rotary actuators.

I claim:  
     
         1 . A saw, comprising in combination 
 a frame assembly having a first and a second end;    a drive pulley journaled to said frame assembly;    a driven pulley journaled to said frame assembly;    a continuous loop blade extending at least partially around said drive pulley and said driven pulley to provide two cutting blade segments; and    at least one anti back-out bearing intermediate said drive and driven pulleys for maintaining said continuous loop blade on said drive and driven pulleys.    
     
     
         2 . The saw as defined in  claim 1 , further comprising a motor mounted to said frame assembly and operably coupled to said drive pulley.  
     
     
         3 . The saw as defined in  claim 1 , further comprising a movable carriage interconnecting at least one of said drive pulley and said driven pulley to said frame assembly.  
     
     
         4 . The saw as defined in  claim 1 , further comprising at least one idle-assembly proximate at least one of said drive pulley and said driven pulley and adapted to engage said continuous loop blade for accommodating tensional variations in said continuous loop blade.  
     
     
         5 . The saw as defined in  claim 1 , wherein said frame assembly includes a handle at one of said first and second ends, and a fixed hand grip at an opposite end of said frame assembly.  
     
     
         6 . The saw as defined in  claim 1 , further comprising at least one guide roller assembly disposed adjacent said continuous loop blade.  
     
     
         7 . The saw as defined in  claim 2 , wherein said drive pulley is coupled to said motor by a transmission  
     
     
         8 . The saw as defined in  claim 3 , wherein said movable carriage includes an adjusting member for translating said movable carriage between a first and a second position.  
     
     
         9 . A method for manufacturing a powered coping saw, comprising the steps of: 
 providing a frame assembly having a first and second end;    journaling a drive pulley and a driven pulley to said frame assembly;    mounting a continuous loop blade between said drive pulley and said driven pulley to define two parallel intermediate blade sections; and    providing at least one anti back-out bearing assembly proximate at least one of said two parallel intermediate blade sections.    
     
     
         10 . The method as defined in  claim 9 , further including the steps of interconnecting said drive pulley to a motor.  
     
     
         11 . The method as defined in  claim 9 , further comprising the step of providing at least one guide bearing assembly adjacent a non-cutting edge of said two parallel intermediate blade sections.  
     
     
         12 . The method as defined in  claim 9 , further comprising the step of providing one of said drive and driven pulleys with an adjustment mechanism.  
     
     
         13 . The method as defined in  claim 12 , wherein the step of providing one of said drive and driven pulleys with an adjustment mechanism includes the steps of: 
 mounting a carriage in sliding engagement on said frame assembly; and    mounting a member on said carriage for acting against said frame assembly and urging said carriage between a first and a second position.    
     
     
         14 . A coping saw, comprising: 
 a frame assembly    a drive pulley journaled to one end of said frame assembly;    a driven pulley journaled to an opposite end of said frame assembly    a saw blade looped at least partially around said drive and driven pulleys, said saw blade having a cutting surface providing two generally parallel cutting segments; and    at least one anti back-out bearing assembly mounted to said frame assembly and disposed adjacent said cutting surface of said saw blade.    
     
     
         15 . The coping saw as defined in  claim 14 , further comprising at least one roller assembly adjacent each of said two generally parallel cutting segments.  
     
     
         16 . The coping saw as defined in  claim 14 , further comprising a motor assembly mounted to said frame assembly and having a drive shaft interconnected to said drive pulley.  
     
     
         17 . The coping saw as defined in  claim 14 , further comprising a swiveling handle mounted proximate one end of said frame assembly.  
     
     
         18 . The coping saw as defined in  claim 14 , further comprising a carriage disposed in sliding relationship on said frame assembly and journaled to at least one of said drive pulley and said driven pulley.  
     
     
         19 . The coping saw as defined in  claim 15 , wherein said at least one roller assembly includes a guide roller.  
     
     
         20 . The coping saw as defined in  claim 17 , further comprising a switch mounted in said swiveling handle.  
     
     
         21 . The coping saw as defined in  claim 17 , wherein said handle assembly also pivots.