Abstract: An accessory for use with a conventional door closer having a body for mounting on a hinged door or the door jamb and a spring biased rotatable shaft constantly urging the door toward a closed position. The accessory comprises a first member having a reaction plate fixed with respect to the door closer body, a second member, such as an externally splined ring, fixed with respect to the door closer shaft, and a member, such as a flanged collar, rotatably interconnecting the first and second members. The collar is threaded into a hole in the reaction plate, and has an internally splined hole accommodating and meshing with the splined ring. The force of frictional engagement between the flange and the reaction plate progressively increases as the door is opened, and at an adjustable predetermined open position of the door the frictional resistance between the flange and reaction plate is stronger than the closing force of the door closer, so that the door is held open.

Abstract: A door closer used with a door frame and a door panel has a hold-open device for holding the closer in any full or intermediate door-open position. The door panel is free for some manual operation independently of the closer because of a lost-motion, rotary connection between the door frame and door panel. This involves a closer shaft having a thread therein or thereon engaged by a threaded member on the closer arm so that when the member and shaft rotate relative to each other, there is also relative axial translation between them. When the hold-open device is released from some set open position after some manual, door panel closing motion, the shaft revolves, causing some originally abutting but separated facing surfaces on the member and the shaft axially to approach each other and finally and again to abut, thus taking out the lost motion and causing the closer to move the door panel from substantially fully open or any intermediate open position into fully closed position.

Abstract: A door closer for moving a door connected thereto from an open position to a closed position includes a housing, a chamber located within the housing, a piston movable in the chamber in response to movement of the door and a linkage assembly connected to the door for transmitting door movement from the door to the piston. A fluid chamber is disposed on one side of the piston and the piston moves through the fluid chamber upon closing movement of the door. Valve means is provided for controlling the rate of fluid flow from the fluid chamber as the piston moves therethrough to thereby control the rate of movement of the piston and the damping force acting on the door. A spring is disposed in the chamber and acts on the piston to provide a force to move the door toward the closed position.

Abstract: A door closer and a connector are joined to a door panel and a door frame. The connector includes an arm and a restraining device such as a track or a link. The arm has an arm base fast on a shaft projecting from the closer for rotation about a first axis and has an arm extension at one end connected to the restraining device and at the other end pivoted to the arm base for rotation relative thereto about a second axis parallel to and spaced from the first axis. A shoulder on the arm base and an abutment on the arm extension come into contact in one position of relative rotation of the arm base and the arm extension. If desired, there may also be a locking device engaging both the arm base and the arm extension and precluding relative rotation therebetween about the second axis. Further, there may be a damping device such as a friction brake for partially inhibiting relative rotation about the second axis.

Abstract: A device for controlling the opening or closing speed of a door includes a piston-piston rod assembly slidably fitted in the inner tube of a dual tube hydraulic cylinder. Oil is enclosed in the inner tube and in a portion of the outer tube, and a high pressure gas is enclosed in the outer tube for affording a force on the assembly to project the piston rod outwardly of the cylinder. A mechanism controls oil flow in the cylinder when the piston moves in one direction in the cylinder. A device converts the reciprocal movement of the piston rod into opening-closing movement of the door.

Abstract: An automatic door closing device for use in a sliding type door, which includes a driving section having a spiral spring disposed in a casket to urge the sliding door toward closing direction and a buffer mechanism having a cylinder and a piston for moderating closing speed of the door. The inner end of the spring is secured to a stationary shaft on which the piston is coaxially mounted. The casket containing the spring and fixing the outer end thereof and the cylinder containing the piston through an anti-rotating mechanism are integrally formed as a housing, into which lubricating oil is filled.

Abstract: A door closer comprising a plate-shaped mounting bracket which is fixed to a door and has a pair of elongate tongue-shaped male coupling portions at both edges thereof, and a main body of the door closer which has a pair of elongate groove-shaped female coupling portions at the outer side face thereof, in which the female coupling portions is slidably fitted to the male coupling portions for connecting the main body to the mounting bracket.

Abstract: This disclosure relates to an electrically actuated door holder and release for the multi-point holding of a pivoted door at selected door opening angles, and for the release of a held door either electrically or in response to manual override. The door holder and release includes a rotatable spindle adapted to be connected to a pivoted door which is either push or pull-side mounted. The holder and release comprises a spindle gear assembly having a pair of male spline gears with each gear having a circular ring of splineways forming a series of male projecting keys. A pair of cams, each having cam lobes defining detent segments with each cam having a circular hole internally grooved to mate with the projecting keys of spline gear, is mounted on the shaft. A pair of springs yieldingly hold the cams into mating positions with associated spline gears to rotate therewith. A double lever having a common pivot or fulcrum carries a roller which follows the cams.

Abstract: A device for controlling the opening and closing movement of a duct seal door of an automatic ice maker which requires a regulator for slowing down the closing of the door. The movement of the door about its rotational axis is transmitted via connecting linkages to the closure regulator which comprises a rotor positioned within a stator housing. The rotor's movement is coupled to the connecting linkages via a one-way clutch which decouples the rotor when the door is being opened, and causes positive coupling therebetween when the door is being closed. Disposed within the stator housing in a fixed-volume compartment is a viscous fluid, such as silicone gum. The rotor and stator include opposed rippled surfaces between which the viscous fluid is coactively disposed. The fluid acts as an impedance to the motion of the rotor, which motion occurs only upon the closing of the door, to thereby provide a controlled slow closure thereof.

Abstract: A door stop and hold open for use in refrigerated display cabinets includes a selectively positionable arrestor for limiting the swing of the door and for detenting the door in its widest open position. Detenting action is provided by a clip having two leaf springs between which a pin is forced as the opening door approaches its limiting position, and by which the pin is yieldably retained. The leaf springs are shaped to provide rigidity except in the direction of spreading and to provide a large surface area for contacting the pin, thereby reducing wear.

Abstract: An electromechanical door holder-closer includes a conventional door closer which has a shaft rotatable in response to movement of a door between its open and closed positions and resilient means for yieldably resisting rotation of the shaft in one direction. A latching mechanism cooperates in a latching position with a uni-directional clutch mounted on the shaft to permit free movement of the door from its closed position toward its open position and to releasably retain the door in a selected hold-open position therebetween when the latching mechanism is held in cooperative engagement with the clutch. The latching mechanism is releasably retained in its latching position by a normally energized electrically operated holding mechanism.