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AssigneeColumbus McKinnon Corporation
InventorsRobert O. Braesch, Thomas A. Mefferd, Michael D. Olson
Estimating the term…
An air lifting and balancing unit including a cylinder, a piston in the cylinder, a ball screw affixed to the piston, a ball nut mounted for rotation on the ball screw, a drum mounted on the ball nut, a chain driven by the drum, and centrifugally actuated brakes mounted on the drum for stopping rotation of the drum when the drum exceeds a predetermined acceleration either due to a loss of load or to a loss of air pressure applied to the piston, and a pneumatic circuit in communication with the cylinder for providing air pressure thereto which applies a force on the piston which is at a substantially constant incremental value in opposition to the force exerted by the load applied to the piston through the chain and the drum and the ball screw regardless of variations in said air pressure to thereby cause the speed of the chain to remain substantially constant.
An air lifting and balancing unit comprising a cylinder, a piston in said cylinder, a ball screw affixed to said piston, a ball nut mounted relative to said cylinder against axial movement and also mounted on said ball screw for rotation thereon, a drum mounted on said ball nut for rotation therewith, an elongated member mounted on said drum for carrying a load, and pneumatic circuit means in communication with said cylinder for providing air pressure thereto which applies a force on said piston which is at a substantially constant incremental value over the force exerted by said load applied to said piston through said elongated member and said drum and said ball screw regardless of variations in said air pressure to thereby cause the speed of said elongated member to remain substantially constant.
An air lifting and balancing unit comprising a cylinder, a piston in said cylinder, a ball screw affixed to said cylinder, a ball nut coupled to said piston for movement therewith and also mounted on said ball screw for rotation thereon, a drum mounted on said ball nut for rotation with said ball nut, an elongated member mounted on said drum for carrying a load, and pneumatic circuit means in communication with said cylinder for providing air pressure thereto which applies a force on said piston which is at a substantially constant incremental value over the force exerted by said load applied to said piston through said elongated member and said drum and said ball screw regardless of variations in said air pressure to thereby cause the speed of said elongated member to remain substantially constant.
An air lifting and balancing unit comprising a cylinder, a piston in said cylinder, a ball screw mounted relative to said piston, a ball nut mounted on said ball screw for rotation thereon, a drum mounted on said ball nut for rotation therewith, an elongated member mounted on said drum for carrying a load, and pneumatic circuit means in communication with said cylinder for providing air pressure thereto which applies a force on said piston which is at a substantially constant incremental value over the force exerted by said load applied to said piston through said elongated member and said drum and said ball screw regardless of variations in said air pressure to thereby cause the speed of said elongated member to remain substantially constant.
An air lifting and balancing unit comprising a cylinder, a piston in said cylinder, a ball screw mounted relative to said piston, a ball nut mounted on said ball screw for rotation thereon, a drum mounted on said ball nut for rotation therewith and for carrying a load, and pneumatic circuit means in communication with said cylinder for providing air pressure thereto which applies a force on said piston which is at a substantially constant incremental value over the force exerted by said load applied to said piston through said drum and said ball screw regardless of variations in said air pressure to thereby cause the speed of rotation of said drum to remain substantially constant.
Dependencies are inferred from the claim text.