Door closer
First Claim
1. A door closer for a door pivotally mounted to a door frame, the door closer comprising:
- a cylinder having a free end and comprising a cylinder housing and an inner end cap, an attachable end adapted for attaching to one of the door or door frame, and a rotatable end cap coupled to the free end of the cylinder and having a passage extending through the rotatable end cap, the rotatable end cap rotating about the axis of the cylinder from a first position to a second position;
a piston slidably mounted within the cylinder and having a piston rod mounted on the piston and extending through the passage in the rotatable end cap, wherein the piston rod is adapted for mounting to the other of the door or door frame;
a biasing element within the cylinder urging the piston toward a retracted position; and
a lock mechanism enclosed within the rotatable end cap exterior of the cylinder housing and inner end cap for arresting the piston relative to the cylinder.
5 Assignments
0 Petitions
Accused Products
Abstract
A door closer includes a cylinder and a piston sliding along the cylinder with a piston rod extending from the cylinder, with the closer mounting at one end to the door and at a second end to the door frame. The door closer has a speed adjustment know extending from a first end for varying the closure rate. Adjustable mounting brackets provide for flexibility in mounting configurations and closing force. A door lock maintains the piston in an extended position and keeps the door open. The lock includes a washer sliding on the piston rod in a first position and locking the rod at a second position. The washer has a tab that engages an angled surface in the first position to prevent locking engagement with the piston rod. A rotatable end cap rotates the washer between the locked position and the unlocked position.
46 Citations
19 Claims
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1. A door closer for a door pivotally mounted to a door frame, the door closer comprising:
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a cylinder having a free end and comprising a cylinder housing and an inner end cap, an attachable end adapted for attaching to one of the door or door frame, and a rotatable end cap coupled to the free end of the cylinder and having a passage extending through the rotatable end cap, the rotatable end cap rotating about the axis of the cylinder from a first position to a second position;
a piston slidably mounted within the cylinder and having a piston rod mounted on the piston and extending through the passage in the rotatable end cap, wherein the piston rod is adapted for mounting to the other of the door or door frame;
a biasing element within the cylinder urging the piston toward a retracted position; and
a lock mechanism enclosed within the rotatable end cap exterior of the cylinder housing and inner end cap for arresting the piston relative to the cylinder. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A lock mechanism used for a door closer having a cylinder retaining a slidable piston attached to a piston rod, the mechanism comprising:
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a cap element coupled to the cylinder, the cap element comprising a first contact surface substantially perpendicular to the piston rod, a second contact surface adjacent to and at an oblique angle relative to the first contact surface, and a passage for the piston rod; and
an L-shaped washer having a first leg having an orifice formed therethrough adapted for receiving the piston rod, and a second leg extending substantially transversely from the first leg toward the cap element, wherein the washer and the cap element are rotatable relative to one another between a first and second position, wherein the second leg engages the second contact surface and maintains the first leg of the washer in a position substantially perpendicular to the piston rod, allowing the piston rod to freely retract and extend within the cylinder when latching is not desired and the washer is rotated to a first, unlocked position. - View Dependent Claims (10, 11, 17)
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12. A door closer for a door pivotally mounted to a door frame, the door closer comprising:
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a cylinder having a cylinder housing with a free end, an attachable end adapted for attaching to one of the door or door frame, and a rotatable end cap coupled to the free end of the cylinder housing and having a passage extending through the end cap;
a piston slidably mounted within the cylinder having a piston rod mounted on the piston and extending through the passage in the end cap, wherein the piston rod is adapted for mounting to the other of the door or door frame;
a biasing element within the cylinder housing urging the piston toward a retracted position;
a support member coupled to the cylinder housing and spaced apart from the end cap intermediate the end cap and the piston biasing element, the support member comprising a cylindrical cap having a first face extending toward the end cap and including an angled contact surface; and
a cantable washer mounted on the piston rod exteriorly of the cylinder housing intermediate the cap and the support member, wherein the washer is juxtaposed the first face of the support member. - View Dependent Claims (13, 14, 15, 16)
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18. A door closer for a door pivotally mounted to a door frame, the door closer comprising:
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a cylinder having a free end, an attachable end adapted for attaching to one of the door or door frame, and a rotatable end cap coupled to the free end of the cylinder and having a passage extending through the end cap, the end cap rotating about the axis of the cylinder from a first position to a second position;
a piston slidably mounted within the cylinder and having a piston rod mounted on the piston and extending through the passage in the end cap, wherein the piston rod is adapted for mounting to the other of the door or door frame;
a biasing element within the cylinder urging the piston toward a retracted position; and
a lock mechanism enclosed within the end cap for arresting the piston relative to the cylinder, comprising a support member coupled to the cylinder and spaced apart from the end cap intermediate the end cap and the piston biasing element, the support member having a first face extending toward the end cap and including an angled contact surface at an oblique angle to the first face; and
a washer that engages the angled contact surface in a first position, which holds the washer to allow the piston rod to freely retract and extend within the cylinder when locking is not desired and the end cap is rotated to a first, unlocked position.- View Dependent Claims (19)
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Specification