Concrete saw having multiple motors

Abstract

A device comprises an implement configured to be driven and a first motor and a second motor. Each motor includes a rotational output shaft and a transmission assembly connected to the output shaft. The output shafts of the first and second motors are coupled together by the transmission assemblies such that the output shafts turn at the same rate. The first and second motors contribute equally to the driving of the implement.

What is claimed is: 
     
         1 . A device comprising:
 an implement configured to be driven; and   a first motor and a second motor, each motor including a rotational output shaft and a transmission assembly connected to the output shaft, the output shafts of the first and second motor being coupled together by the transmission assemblies such that the output shafts turn at the same rate, the first and second motors contributing equally to the driving of the implement.   
     
     
         2 . The device of  claim 1 , further including a frame for supporting the first and second motors in a front-to-back relationship, the rotational output shaft of each motor being aligned generally transverse to a longitudinal length of the at least one frame. 
     
     
         3 . The device of  claim 1 , wherein the implement is rotatably connected to the frame via an implement shaft oriented parallel to the outputs shafts of the first and second motors, the implement shaft having at least one sheave pulley, and
 the transmission assembly of the first motor nearest the implement shaft includes a first sprocket assembly having a first sprocket and a second sprocket, the at least one sheave pulley of the implement shaft being operably coupled to one of the sprockets of the first sprocket assembly.   
     
     
         4 . The device of  claim 3 , further including a rotatable jack shaft oriented parallel to the outputs shafts of the first and second motors and to the implement shaft, the jack shaft having a sprocket and at least one sheave pulley, the sprocket being operably connected to the first sprocket of the first sprocket assembly of the first motor, the at least one sheave pulley being operably being connected to the at least one sheave pulley of the implement shaft. 
     
     
         5 . The device of  claim 4 , wherein the sprocket of the jack shaft has a diameter approximately twice a diameter of the at least one sheave pulley of the jack shaft. 
     
     
         6 . The device of  claim 4 , further including a first flexible belt having teeth formed along an inner surface thereof, the teeth of the first flexible belt engaging the first sprocket of the first sprocket assembly and the sprocket of the jack shaft. 
     
     
         7 . The device of  claim 4 , wherein the jack shaft includes a first end portion and a second end portion, the first end portion including the sprocket and a first sheave pulley and the second end portion including a second sheave pulley, and
 the implement shaft includes a first end portion and a second end portion, the first end portion including a first sheave pulley and the second end portion including a second sheave pulley,   wherein the first sheave pulley of the jack shaft is operably connected to the first sheave pulley of the implement shaft and the second sheave pulley of the jack shaft is operably connected to the second sheave pulley of the implement shaft.   
     
     
         8 . The device of  claim 7 , further comprising a second flexible belt engaging the first sheave pulley of the jack shaft and the first sheave pulley of the implement shaft, and
 a third flexible belt engaging the second sheave pulley of the jack shaft and the second sheave pulley of the implement shaft.   
     
     
         9 . The device of  claim 4 , further including a tensioner assembly connected to the frame, the tensioner assembly configured to provide positional adjustment between the output shaft of the first motor, the jack shaft and the implement shaft. 
     
     
         10 . The device of  claim 9 , further including a second frame positioned on the frame, the implement shaft being located on the frame, each of the first and second motors and the jack shaft being located on the second frame, the tensioner assembly configured to provide vertical adjustment between the frame and the second frame. 
     
     
         11 . The device of  claim 3 , wherein the transmission assembly of the second motor includes a second sprocket assembly having a first sprocket and a second sprocket, one of the sprockets of the second motor being operably connected to the second sprocket of the first motor, and
 further comprising a belt assembly operably connected to the other sprocket of the second motor, the belt assembly adapted to power an associated hydrostatic motor for propelling the device.   
     
     
         12 . The device of  claim 11 , further including a fourth flexible belt having teeth formed along an inner surface thereof, the teeth of the fourth flexible belt engaging the second sprocket of the first sprocket assembly of the first motor and the one sprocket of the second sprocket assembly of the second motor. 
     
     
         13 . The device of  claim 11 , wherein each of the first and second sprockets of the first sprocket assembly of the first motor and the one sprocket of the second sprocket of the second motor have approximately equal diameters. 
     
     
         14 . The device of  claim 1 , further comprising a timing assembly configured to ensure that the output shafts of the first and second motors turn at approximately the same rate, the timing assembly being part of an ignition system of each of the first and second motors. 
     
     
         15 . The device of  claim 1 , wherein the device is a concrete saw and the implement is a saw blade. 
     
     
         16 . A concrete saw comprising:
 a generally rectangular frame having a front end, a read end and a longitudinal length;   a first motor and a second motor supported by the frame, each motor including a rotational output shaft aligned generally transverse to the longitudinal length of the frame and a sprocket assembly connected to the output shaft, the output shafts of the first and second motors being coupled together by the sprocket assemblies such that the output shafts turn at approximately the same rate, the first and second motors contributing equally to the driving of a saw blade   the saw blade rotatably connected to the frame via a saw blade shaft oriented parallel to the outputs shafts of the first and second motors, the saw blade shaft having at least one sheave pulley; and   a rotatable jack shaft oriented parallel to the outputs shafts of the first and second motors, the jack shaft having a sprocket and at least one sheave pulley, the sprocket being operably connected to one of the sprocket assemblies of the first and second motors, the at least one sheave pulley being operably connected to the at least one sheave pulley of the saw blade shaft.   
     
     
         17 . The concrete saw of  claim 16 , wherein the first and second motors are positioned in a front-to-back relationship on the frame. 
     
     
         18 . The concrete saw of  claim 16 , further including a second frame positioned on the frame and a tensioner assembly connected to the frame and second frame, the saw blade shaft being located on the frame, each of the first and second motors and the jack shaft being located on the second frame, the tensioner assembly being configured to provide vertical adjustment between the frame and the second frame. 
     
     
         19 . The concrete saw of  claim 16 , further comprising a timing assembly operably configured to ensure that the output shafts of the first and second motors turn at approximately the same rate, the timing assembly being part of an ignition system of each of the first and second motors. 
     
     
         20 . The concrete saw of  claim 16 , further comprising a plurality of flexible belts for interconnecting the sprocket assemblies of the first and second motors, the at least one sheave pulley of the saw blade shaft, and the sprocket and at least one sheave pulley of the jack shaft.