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Door closer

  • US 4,999,872 A
  • Filed: 02/02/1990
  • Issued: 03/19/1991
  • Est. Priority Date: 12/12/1987
  • Status: Expired due to Term
First Claim
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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.

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