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US 4,785,718 AGranted
Spring brake cylinder
AssigneeNippon Air Brake Co., Ltd.
InventorsYasuhisa Hata, Osamu Akamatsu
Life of this patent
Estimating the term…
Abstract
A spring brake cylinder assembly in which a pushrod connectable to a brake assembly is extendable from an end of such cylinder housing the piston member. The spring brake cylinder further includes a clutch release mechanism for manually releasing the brake force being applied.
Claims7
A spring brake cylinder assembly, said assembly comprising:
- (a) a body portion having a pair of axially opposed end walls, said body portion including a fluid pressure connection adjacent a first end wall;
- (b) a piston positioned for reciprocal axial movement within said body portion, said piston having a face portion adjacent said first end wall of said body portion and a stem portion extending in an axial direction from an inner surface of said face portion of said piston, said stem portion including a plurality of apertures extending a sidewall thereof, said piston further including an axial bore extending through said face portion and said stem portion;
- (c) a generally hollow piston guide means having an inner surface engageable with an outer surface of said stem portion of said piston and a second end wall of said body portion for guiding said piston in an axial direction during reciprocal axial movement of said piston;
- (d) a brake spring caged between said inner surface of said face portion of said piston and said second end wall of said body portion to supply a predetermined braking force to said assembly;
- (e) a pushrod slidably positioned through said bore in said face portion and said stem portion of said piston and extending coaxially out of a bore in said first end wall of said body portion, said pushrod including a groove formed around an outer surface thereof adjacent one end;
- (f) a clutch means including a plurality of balls positioned for engagement with said apertures in said stem portion piston and said groove in said pushrod and said piston guide means for making a connection and disconnection of said piston with said pushrod thereby controlling their relative displacement in an axial direction;
- (g) a clutch control means engageable with said clutch means for controlling said clutch means between an engaged and disengaged state;
- and
- (h) a clutch operating means positioned adjacent said second end of said body portion and engageable with said clutch control means for manually releasing said assembly from a brake application.
6 more elements
Dependencies are inferred from the claim text.