F - Mech Eng,Light,Heat,Weapons – 15 – B
Patent
F - Mech Eng,Light,Heat,Weapons
15
B
F15B 13/06 (2006.01) E01C 19/20 (2006.01) E01H 5/04 (2006.01) E01H 5/06 (2006.01) F15B 11/16 (2006.01) F15B 13/02 (2006.01)
Patent
CA 2390186
A hydraulic system for operating equipment for removing snow and/or ice from surfaces having a plow, and a spreader for spreading traction enhancing materials onto the surfaces comprises a fixed displacement pump, a priority valve for receiving all of the hydraulic fluid from the pump and directing it to a load sensitive spreader valve and a plow valve. The priority valve is mechanically biased to direct the hydraulic fluid primarily to the spreader valve. The pressure from the fluid directed to the spreader valve is used to oppose the mechanical bias while the load pressure from the spreader valve is used to augment the mechanical bias, such that the spreader valve receives the amount of hydraulic fluid required for its operation. The system further includes an orifice connected to a load sensing line in the spreader valve to bleed fluid from the line. The spreader may include a conveyor and/or an auger and a spinner for spreading materials, as well as a dispenser for liquid materials. The metering devices for operating the components in the spreader may be solenoid or mechanically operated; the metering devices for operating the plow may be solenoid, air, hydraulic or mechanically operated.
Gowling Lafleur Henderson Llp
Hacker Richard
LandOfFree
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