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US 6,629,479 B2Granted
On-car brake lathe having improved support trolley
AssigneeHennessy Industries, Inc.
InventorsDavid M. Carpenter, Melvin R. Willis
Life of this patent
Estimating the term…
Abstract
A trolley is provided for supporting and portably moving an on-car brake lathe. The trolley includes wheels for mobility and a pneumatic cylinder for height adjustment. The pneumatic cylinder includes a piston rod, piston, and air valve. The piston has an equalizing port for dampened movement throughout the cylinder's stroke. The air valve allows static height adjustment of the lathe.
Claims17
An apparatus comprising:
- an on-car brake lathe device;
- a trolley supporting said on-car brake lathe device;
- said trolley having a cylinder assembly including a cylinder housing, a piston located within said cylinder housing and a piston rod rigidly attached to said piston;
- said piston rod extending through a hole defined in said cylinder housing, said hole including a seal slidingly engaging an outer surface of said piston rod;
- said on-car brake lathe device being connected to said trolley such that relative reciprocative movement between said piston and said cylinder housing causes raising and lowering of said on car brake lathe device;
- and
- said piston defining an equalizing port for gas communication between an upper chamber and a lower chamber of said cylinder housing.
4 more elements
A trolley for supporting and positioning a piece of equipment, said trolley comprising:
- a base structure;
- a mounting structure to which said piece of equipment is connected;
- a cylinder assembly connected between said base structure and said mounting structure;
- said cylinder assembly including a cylinder housing, a piston having a first side and a second side and being located within said cylinder housing, and a piston rod attached to said second side of said piston such that said first side of said piston has a first surface area and said second side of said piston has a second surface area, said first surface area being greater than said second surface area;
- wherein said piston separates first and second fluid chambers in said cylinder housing respectively bounded by said first and second sides of said piston, said piston defining an equalizing port to permit gas communication between said first and second chambers such that fluid pressure on both sides of said piston will be equal but will be respectively applied to said first surface area and said second surface area so as to maintain said mounting structure at a selected height.
2 more elements
Dependencies are inferred from the claim text.