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A concrete saw having a geared assembly for rotating a cutting blade is described. The saw utilizes a longitudinally oriented engine for rotating the blade. Various additional features and improvements are described including a particular belt tensioner assembly, an indicator and control system for

A concrete saw having a geared assembly for rotating a cutting blade is described. The saw utilizes a longitudinally oriented engine for rotating the blade. Various additional features and improvements are described including a particular belt tensioner assembly, an indicator and control system for cutting blade depth, a handle adjustment and locking system, and provisions for control of blade water are described.

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1. A concrete saw blade depth control system for a concrete saw including a frame, a wheel assembly mounted on a pivotable carriage, and a hydraulic ram extending between the frame and the carriage for selectively positioning the carriage and changing the blade depth, the blade depth control system

1. A concrete saw blade depth control system for a concrete saw including a frame, a wheel assembly mounted on a pivotable carriage, and a hydraulic ram extending between the frame and the carriage for selectively positioning the carriage and changing the blade depth, the blade depth control system comprising: a linearly positionable actuator rod;an electric motor operably engaged with the rod for selectively positioning the rod relative to the frame; anda slide member carrying a proximity sensor in sensing range of the actuator rod, the slide member mechanically coupled to the carriage such that changing the position of the carriage displaces the slide member and proximity sensor;wherein a change in the relative position of the slide member and the proximity sensor to the actuator rod enables the proximity sensor to provide a signal indicative of such position change. 2. The concrete saw blade depth control system of claim 1 wherein the proximity sensor is a magnetic field proximity sensor and the actuator rod includes a magnet. 3. The concrete saw blade depth control system of claim 1 further comprising: a sensing enclosure having a hollow interior, wherein the actuator rod, the slide member, and the proximity sensor are disposed within the interior of the enclosure. 4. The concrete saw blade depth control system of claim 1 wherein the slide member is mechanically coupled to the carriage by: a carriage bracket affixed to the carriage;a pivotable cross arm attached to the frame;a first linkage member extending between the cross arm and the carriage bracket;a pivotable lever attached to the frame, a first end of the lever engaged to the slide member; anda second linkage member extending between the cross arm and a second end of the lever, the second end being opposite the first end of the lever. 5. The concrete saw blade depth control system of claim 1 wherein the proximity sensor is in communication with a controller for operating the hydraulic ram. 6. The concrete saw blade depth control system of claim 1 wherein the electric motor is selectively operable to position the actuator rod to a desired position relative to the proximity sensor. 7. A concrete saw with a selectively adjustable and locking handle assembly, the saw including an upper frame assembly, the handle assembly comprising: a pair of handles spaced apart from one another;a handle cross member extending between and secured to the pair of handles;a pair of shoulder members affixed to the upper frame assembly, each shoulder member including a collar for rotatably receiving and supporting the handle cross member; anda hydraulic handle adjusting system engaged to an end of at least one of the handles, the hydraulic adjusting system including a cylinder secured to the upper frame and a ram receivably engaged with the cylinder, the ram coupled to at least one of the handles, and a selectively operable valve in fluid communication with the ram for controlling positioning of the ram and the pair of handles. 8. The concrete saw and handle assembly of claim 7 wherein the ram defines a first end coupled to an end of at least one of the handles and a piston slidably disposed within the cylinder. 9. The concrete saw and handle assembly of claim 8 wherein the cylinder defines an interior region and includes a pair of ports providing access to the interior region, the hydraulic adjusting system further including: a fluid flow loop extending between the pair of ports;wherein the piston is disposed between the pair of ports and the valve is in fluid communication with the fluid flow loop. 10. The concrete saw and handle assembly of claim 7 wherein the valve includes a solenoid in operable engagement with the valve. 11. The concrete saw and handle assembly of claim 7 wherein the ram is coupled to an end of one of the handles and the handle to which the ram is coupled includes a grip at an opposite end. 12. The concrete saw and handle assembly of claim 7 wherein upon opening the valve, positioning of the ram and the pair of handles induces flow of fluid in the hydraulic adjusting system. 13. The concrete saw and handle assembly of claim 7 wherein upon closing the valve, fluid flow in the hydraulic adjusting system is precluded thereby locking the position of the ram and the pair of handles. 14. A concrete saw blade depth indicator and control system for a concrete saw including a frame, a wheel assembly mounted on a pivotable carriage, the position of the carriage governing the blade depth, the blade depth indicator and control system comprising: a controller including a rotatable indicator knob, a rotatable drive member in engagement with the indicator knob, a rotatable cam member in operable association with the drive member, and a switch actuatable according to the rotary position of the cam member;a cable in engagement with the drive member such that movement of the cable along its longitudinal axis induces rotary movement of the drive member, the cable defining a first end affixed to the frame, and a second end affixed to the carriage;wherein a change in the position of the carriage causes movement of the cable and rotation of the drive member, which actuates the switch by action of the cam member. 15. The concrete saw blade depth indicator and control system of claim 14 wherein the drive member includes a drive gear and the cam member includes a cam gear, the drive gear and the cam gear being in meshed engagement with one another. 16. The concrete saw blade depth indicator and control system of claim 14 wherein the controller further includes a roller member in contact with the cam member and in operable engagement with the switch. 17. The concrete saw blade depth indicator and control system of claim 14 further comprising: an electrically operated water pump adapted for providing water to a cutting blade, the pump being in electrical communication with and actuatable by the switch. 18. The concrete saw blade depth indicator and control system of claim 14 wherein the controller further includes a face plate with indicia corresponding to blade depth. 19. The concrete saw blade depth indicator and control system of claim 14 further comprising: a biasing member disposed between the first end of the cable and the frame for maintaining tension on the cable. 20. The concrete saw blade depth indicator and control system of claim 14 wherein after positioning of the carriage, the indicator knob can be rotated to a desired rotary position during which the drive member is rotated past the cable.