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US 4,064,589 AGranted
Door closer
AssigneeBuilders Brass Works
InventorsThomas M. Bejarano, Herbert Schmidt, Joseph J. Schmidt
Life of this patent
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AssigneeBuilders Brass Works
InventorsThomas M. Bejarano, Herbert Schmidt, Joseph J. Schmidt
Estimating the term…
Disclosed herein is a device for closing swinging doors which is mounted in a door frame and has an elongated housing with a spindle rotatably mounted in one end thereof by which the door closer is secured to a door. A cylinder is interiorly formed in the other end of the housing and has a piston disposed therein. The piston rod extends from the cylinder and is secured at its extended end to a pair of flat carrier plates which are slidably mounted within the housing about the spindle and biased to maintain the door in a closed position. Camming surfaces are carried by the spindle which cooperate with a pair of cam followers carried by the carrier plates to hold the door in an open position. Valve means communicating with the cylinder are provided to permit fluid flow from one end of the cylinder to the other about the piston for controlling the rate of travel of the piston within the cylinder and thereby regulate the rate of movement of the door as it is being opened, closed and latched.
A door closer comprising a housing, a spindle member rotatably mounted in said housing for securing said closer to a door, a cylinder formed interiorly of said housing, a piston operable in said housing, means interconnecting said piston and said spindle member for movement of said piston upon rotation of said spindle member, and means for independently regulating the rate of closing and back checking the opening and latching of the door, said means including a plurality of valve means communicating with said cylinder for permitting a restricted flow of fluid about said piston as said piston reciprocates within said cylinder in response to the opening and closing of said door and means corresponding to the positioning of said piston within said cylinder for varying said restricted flow to correspondingly vary the rate of travel of said piston, said restricted flow varying means being operable at both ends of said cylinder and therebetween.
A door closer comprising a housing, a spindle member rotatably mounted in said housing for securing said closer to a door, a cylinder formed interiorly of said housing, a piston operable in said housing, means interconnecting said piston and said spindle for movement of said piston upon rotation of said spindle member said means comprising a carrier plate slidably mounted within said housing about said spindle member, means connecting said plate to said piston, a first cam follower carried by said plate and a first cam carried by said spindle member, said cam having a cam surface engageable with said cam follower for linear movement of said plate and said piston upon rotation of said cam, biasing means for urging said plate toward said cylinder upon rotation of said spindle in a door opening direction, and means for independently regulating the rate of closing and back checking the opening and latching of the door, said means including a plurality of valve means communicating with said cylinder for permitting a restricted flow of fluid about said piston as said piston reciprocates with said cylinder in response to the opening and closing of said door and means corresponding to the positioning of said piston within said cylinder for varying said restricted flow to correspondingly vary the rate of travel of said piston, said resticted flow varying means being operable at both ends of said cylinder and therebetween.
A door closer comprising a housing, a spindle member rotatably mounted in said housing for securing said closer to a door, a cylinder formed interiorly of said housing, a piston operable in said housing, means interconnecting said piston and said spindle for movement of said piston upon rotation of said spindle member said means comprising a carrier plate slidably mounted within said housing about said spindle, a cam follower carried by said plate, a cam carried by said spindle member, said cam having a cam surface engageable by said cam follower and said surface having a hold-open recess therein, said recess being positioned on a portion of the cam surface having an over-center relationship with respect to the pivotal movement of the cam, biasing means for urging said plate toward said cylinder upon rotation of said spindle in a door opening direction, and means for independently regulating the rate of closing and back checking the opening and latching of the door, said means including a plurality of valve means communicating with said cylinder for permitting a restricted flow of fluid about said piston as said piston reciprocates within said cylinder in response to the opening and closing of said door and means corresponding to the positioning of said piston within said cylinder for varying said restricted flow to correspondingly vary the rate of travel of said piston, said restricted flow varying means being operable at both ends of said cylinder and therebetween.
A door closer comprising a housing, a spindle member rotatably mounted in said housing for securing said closer to a door, a cylinder formed interiorly of said housing, a piston operable in said housing, means interconnecting said piston and said spindle for movement of said piston upon rotation of said spindle member said means comprising a carrier plate slidably mounted within said housing about said spindle member, means connecting said plate to said piston, a first cam follower carried by said plate, a first cam carried by said spindle member, said cam having a cam surface engageable by said cam follower and said surface having a hold-open recess therein, said recess being positioned on a portion of the cam surface having an over-center relationship with respect to the pivotal movement of the cam, a second cam follower carried by said plate, a second cam carried by said spindle member, said cam having a cam surface engageable by said second cam follower for retracting said plate within said housing upon rotation of said cam and means for independently regulating the rate of closing and back checking the opening and latching of the door, said means including a plurality of valve means communicating with said cylinder for permitting a restricted flow of fluid about said piston as said piston reciprocates within said cylinder in response to the opening and closing of said door and means corresponding to the positioning of said piston within said cylinder for varying said restricted flow to correspondingly vary the rate of travel of said piston, said restricted flow varying means being operable at both ends of said cylinder and therebetween.
A door closer comprising a housing, a spindle member rotatably mounted in said housing for securing said closer to a door, a cylinder formed interiorly of said housing, sealing means isolating said cylinder from said housing, a piston operable in said cylinder, means interconnecting said piston and said spindle member for movement of said piston upon rotation of said spindle member, said means including a carrier plate slidably mounted within said housing about said spindle member, means connecting said plate to said piston, a first cam follower carried by said plate and a cam carried by said spindle member, said cam having a cam surface engageable with said cam follower for retracting said plate within said housing upon rotation of said cam, spring means adapted to be compressed upon rotation of said spindle member in a door opening direction and urge said plate forward towards said cylinder, cam follower means for holding said door in an open position, means for rendering said hold-open means inoperative and valve means for regulating the rate of closing and back checking the opening and latching of said door.
A door closer comprising a housing, a spindle member rotatably mounted in said housing for securing said closer to a door, a cylinder formed interiorly of said housing, sealing means isolating said cylinder from said housing, a piston operable in said cylinder, means interconnecting said piston and said spindle member for movement of said piston upon rotation of said spindle member, said means including a carrier plate slidably mounted within said housing about said spindle member, means connecting said plate to said piston, a first cam follower carried by said plate and a cam carried by said spindle member, said cam having a cam surface engageable with said cam follower for retracting said plate within said housing upon rotation of said cam, biasing means for urging said plate toward said cylinder upon rotation of said spindle in a door opening direction, and valve means for independently regulating the rate of closing said door, back checking the opening of said door and latching of said door.
Dependencies are inferred from the claim text.