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US 4,934,500 AGranted
Fluid pressure releasing device for overload apparatus
AssigneeHorton Manufacturing Co., Inc.
InventorsJames V. Hanks, Ruth A. Litterick
Life of this patent
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AssigneeHorton Manufacturing Co., Inc.
InventorsJames V. Hanks, Ruth A. Litterick
Estimating the term…
Device (200) for releasing fluid pressure from the pressure chamber of an overload clutch (A) is disclosed including a valve (210) captured in a radial cavity (202) in the cylinder (10) of the overload clutch (A) between a shoulder (204) and a valve cover (212) held by a snap ring (226). The valve cover (212) includes an aperture (228) for receiving a ball (230) and allowing the ball (230) to move radially inwardly to push against the spool member (220) of the valve (210) to unseat its head (221) from a seat (218) but preventing the ball (230) from moving out of the valve cover (212). The ball (230) rolls on a valve actuator (232) mounted to the piston (22). When the cylinder (10) and piston (22) are axially separated by fluid pressure, the ball (230) is located in a dent (234) formed in the valve actuator (232) such that the head (221) of the spool member (220) seals with the seat (218) and prevents release of fluid pressure from the pressure chamber. When the cylinder (10) and the piston (22) move axially against the normal bias direction of the fluid pressure, the ball (230) rolls out of the detent (234) and pushes against the spool member (220) to unseat the head (221) from the valve seat (218). In the most preferred form, the valve actuator (232) is adjustably mounted to the piston (22) by a turnbuckle (238), with the valve actuator (232) and the turnbuckle (238) formed of hexagonal stock for receipt in a wrench.
In a rotational control device including a piston and a cylinder defining a pressure chamber, with the cylinder being movable relative to the piston from a first position to a second position in response to the introduction of fluid pressure into the pressure chamber, a device for releasing fluid pressure from the pressure chamber comprising, in combination:
In a rotational control device including a piston and a cylinder defining a pressure chamber, with the cylinder being movable relative to the piston from a first position to a second position in response to the introduction of fluid pressure into the pressure chamber, a device for releasing fluid pressure from the pressure chamber comprising, in combination:
Dependencies are inferred from the claim text.