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US 4,375,212 AGranted
Concrete sawing machine propulsion control apparatus
AssigneeLongyear Company
InventorWilliam R. Santschi
Life of this patent
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AssigneeLongyear Company
InventorWilliam R. Santschi
Estimating the term…
A self propelled sawing machine that includes a frame having ground engaging front and rear wheels, an engine driven infinitely variable hydrostatic or mechanical transmission on the frame that is drivingly connected to the rear wheels, a circular saw blade mounted on the frame and drivenly connected to the engine for making cuts in paving or floor materials such as concrete, masonry, etc., a main housing on the frame, a handle connected to one of the main housing and the frame for controlling the direction of movement of the machine, and control mechanism connected to the transmission for controlling the speed and direction of propulsion of the machine. The control mechanism includes a vernier control assembly for coarse and fine adjustment of the forward speed that can be set for a selected optimum speed and manually operable control mechanism connected between the vernier control assembly and transmission that when operated can change the direction and speed of propulsion but that will automatically return to the pre-set optimum condition determined by the setting of the vernier control assembly. The control apparatus also can be used on self propelled walk-behind or ride-on grooving and/or grinding machines.
For a self propelled machine that has a frame, a power driven speed to the output shaft, ground engaging wheels mounted on the frame, a drive connection between the output shaft and at least one of the wheels, a power driven tool mounted on the frame for carrying out a work operation such as cutting, grinding or grooving concrete, masonary, pavement and the like, a vernier control assembly that is adjustably setable for controlling the speed of propulsion transmitted from the transmission to the at least one driven wheel and means connected between the vernier control assembly and the transmission that is operated in response to the setting of the vernier control assembly to change the transmission output shaft drive speed, characterized in that the above means includes manually operably means for overriding the vernier control assembly setting to vary the transmission output shaft speed when manually operated and when manually released discontinue the override of the vernier control assembly setting, the manually operable means including a movable transmission control connection connected to the transmission for controlling the transmission output shaft output speed, a manually movable lower movable between at least two positions and means for mounting the lever on the frame and interconnecting the vernier control assembly, the lever and transmission control connection for moving the control connection as the lever is moved between its position while the preselected vernier control assembly setting is maintained.
A self propelled machine for cutting concrete, pavement and like materials that includes a frame, a power driven cutting tool rotatably mounted on the frame, a plurality of ground engaging wheels mounted on the frame, a power driven reversible variable speed transmission on the frame that has an output shaft and control means operable for selectively varying the output shaft drive speed between zero and increasing forward driving speeds and zero and increasing rearward driving speeds, a drive connection between the output shaft and at least one of the wheels a vernier control assembly that is adjustably setable for various selected machine propulsion speeds, including neutral and various forward propulsion drive speeds, a transmission control that is connected to the transmission control means and movable for operating the control means between output shaft forward and reverse drive speeds, a control mounting member mounted on the frame, an arm pivotally mounted on the frame and connected to the vernier control assembly for being pivotally moved as the vernier control assembly setting is changed, a manually operated lever movable on the frame and connected to the transmission control for moving it as the lever is moved, said lever being movable between neutral and various forward and reverse drive speeds positions, linkage means connected between the lever and arm for moving the lever from the neutral to a forward speed position as the vernier control assembly in being adjusted from its neutral to a forward speed position moves the arm while permitting the lever being manually moved from the position is moved to as a result of the vernier control assembly forward speed setting without changing the vernier control assembly forward speed setting, and means mounting the lever on the control mounting member for movement between its positions.
A self propelled machine for carrying out a working operation such as cutting, grinding or grooving concrete, pavement and the like, comprising a frame, a power driven work performing tool rotatably mounted on the frame, a plurality of ground engaging wheels mounted on the frame, a power driven reversible variable speed transmission on the frame that has an output shaft and control means operable for selectively varying the output shaft drive speed between zero and increasing forward driving speeds and zero and increasing rearward driving speeds, a drive connection between the output shaft and at least one of the wheels, a vernier control assembly that is adjustably setable for various selected machine propulsion speeds, including neutral and various forward propulsion drive speeds, a transmission control member that is connected to the transmission control means and movable for operating the control means between output shaft forward and reverse drive speeds, a manually operated lever movable on the frame and connected to the transmission control member to move the control member as the lever is moved, said lever being movable between neutral and various forward drive speed positions and means for mounting the lever on the frame for movement between its positions and connecting the vernier control assembly to the lever for moving the lever from its neutral position to a forward drive speed position as the vernier control assembly setting is adjusted from neutral to a forward drive speed setting.
Dependencies are inferred from the claim text.