Door closer
First Claim
1. Apparatus for controlling movements of a door panel or a like component between open and closed positions, comprising a housing having a fluid-containing space;
- a damping piston installed in said housing for movement in a first direction during movement of the component from one of said positions and in a second direction during movement of the component toward said one position, said piston dividing said space into first and second compartments and said piston being arranged to expel fluid from said first compartment during movement in said first direction;
channel means provided in said housing and defining a first path for the flow of fluid from said first compartment into said second compartment; and
a valve provided in said piston to enable the fluid to flow from said second compartment into said first compartment during movement of the piston in said second direction, said valve including a body having a passage for the flow of fluid between said compartments and a seat surrounding a portion of said passage, and a valving element which abuts said seat during movement of said piston in said first direction, said body further having a bypass provided in said seat and defining a relatively small second path for the flow of fluid between said compartments during movement of said piston in said first direction.
1 Assignment
0 Petitions
Accused Products
Abstract
A door closer wherein a housing defines a fluid-containing space for a reciprocable damping piston which divides the space into a first and a second compartment. The piston carries a check valve which is closed during movement of the piston in a first direction while the door panel is being opened and which is open when the piston moves in the opposite direction. A channel is provided in the housing to permit fluid to flow from the first compartment into the second compartment during a first stage of movement of the piston in the first direction. The check valve has a body which defines a passage for the flow of fluid between the compartments and is surrounded by a seat having one or more grooves which are only partially overlapped by a spherical or non-spherical valving element during movement of the piston in the first direction to thus establish a relatively small path for the flow of fluid between the compartments, at least during a second stage of movement of the piston in the first direction, such second stage following the first stage. Springs in that compartment from which fluid is expelled during movement of the piston in the first direction oppose such movement of the piston, and an additional spring can be provided to bias the valving element against its seat.
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Citations
13 Claims
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1. Apparatus for controlling movements of a door panel or a like component between open and closed positions, comprising a housing having a fluid-containing space;
- a damping piston installed in said housing for movement in a first direction during movement of the component from one of said positions and in a second direction during movement of the component toward said one position, said piston dividing said space into first and second compartments and said piston being arranged to expel fluid from said first compartment during movement in said first direction;
channel means provided in said housing and defining a first path for the flow of fluid from said first compartment into said second compartment; and
a valve provided in said piston to enable the fluid to flow from said second compartment into said first compartment during movement of the piston in said second direction, said valve including a body having a passage for the flow of fluid between said compartments and a seat surrounding a portion of said passage, and a valving element which abuts said seat during movement of said piston in said first direction, said body further having a bypass provided in said seat and defining a relatively small second path for the flow of fluid between said compartments during movement of said piston in said first direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
- a damping piston installed in said housing for movement in a first direction during movement of the component from one of said positions and in a second direction during movement of the component toward said one position, said piston dividing said space into first and second compartments and said piston being arranged to expel fluid from said first compartment during movement in said first direction;
Specification