A door closer includes: a cylinder secured on a door frame and having a cylinder head formed on a proximal end of the cylinder; a main value and a check valve respectively formed on the cylinder head to control the air in-and-out volume through the valves for lightly opening the door; a piston secured to a rod member slidably reciprocating within the cylinder with the rod member secured to a door; a restoring spring secured between the cylinder head and the rod member for normally resiliently restoring the rod member and the piston towards the cylinder head in order to close the door to the door frame normally as restored by the restoring spring; and at least a buffer member secured between the cylinder head and the piston so as to dampen the inertia force of the closing door to eliminate the noise or damage thus possibly caused.

A door closer, comprising a door closer housing mounted to one of a door frame or a door surface and a linkage arm for pivoting the door between open and closed positions. The linkage arm has a first and second end, the first end mounted to the other of the door frame or the door surface. The door closer includes a rotatable connector between the linkage arm and the door closer housing, the linkage arm second end engaging with the rotatable connector. The connector has a rotatable body portion and head protrusion substantially secured in a female receptor to transmit rotation about a longitudinal axis of the connector. One or both of the head protrusion or female receptor has a curved profile and is further movable with respect to the head protrusion to permit limited rotational misalignment of the linkage arm on any axis perpendicular to the connector longitudinal axis.

A device for at least partially automatically actuating a door leaf, includes a drive having a drive axis of rotation for driving the door leaf at least partially during a movement between an opening position and a closing position, a casing element having a casing axis of rotation for assisting a movement of the door leaf, lever kinematics having at least one lever arm for establishing an operative connection between the drive and the casing element. The lever arm includes a drive-sided connection section, which is supported to be rotationally movable around the drive axis of rotation. The lever kinematics includes at least one transmission component for transferring electric energy and/or data between at least one casing-sided energy source and a drive-sided energy recipient. The connection section has a cranked course, wherein a multi-layered functional compartment for mechanically connecting the lever arm and for electrically connecting the transmission component to the drive is configured along the cranked course of the connection section.

A guiding rail for guiding a door leaf between an opening position and a closing position in relation to a door opening in a wall includes: at least one guiding section with a guiding compartment, in which a sliding element is accommodated to be movable, wherein the guiding section includes a guiding opening, through which a bearing axis of the sliding element exits at least partially from the guiding compartment, at which axis a lever element is supportable to be rotationally movable, in order to establish an operative connection between the sliding element and the door leaf. The guiding rail further includes at least one functional section with a functional compartment, in which a transmission means is receivable, which serves for transferring electrical energy and/or data between at least a wall-sided energy source and a door leaf-sided energy recipient and a labyrinth guide between the guiding and functional compartments.

An exemplary door control assembly includes a door control and an armature assembly. The door control includes a body and a pinion rotatably mounted to the body for rotation about a rotational axis. The pinion has a radially-outer periphery and a recess is formed in the radially-outer periphery. The armature assembly comprises an armature and a coupler. The armature is rotationally coupled with the pinion, and includes an opening in which the pinion is received. The coupler is movably mounted to the armature for movement between a coupling position and a decoupling position. With the coupler in the coupling position, the coupler projects into the recess and axially couples the armature and the pinion to prevent removal of the armature from the pinion. With the coupler in the decoupling position, the coupler axially decouples the armature and the pinion to permit removal of the armature from the pinion.

A backplate for a door actuator includes at least one first mounting element and a second mounting element, wherein one of the two mounting elements is formed for fastening to a mounting surface, in particular door, casing or wall, and the other mounting element is formed for receiving the door actuator. The backplate also includes, at least one connecting assembly, which in a retaining position, keeps the two mounting elements together and, in a release position, does not keep the two mounting elements together, and at least one shape memory assembly with a shape memory element made from shape memory material, wherein, upon thermal activation, the shape memory assembly moves the connecting assembly to the release position.

A door actuator arrangement, comprising a door actuator having an output shaft, with the output shaft having a first face-side end and an opposing second face-side end, a linkage, whose linkage head is fitted on the first end of the output shaft and is connected to the output shaft in a rotationally fixed manner and a connection element. The connection element is connected or can be connected at the first end to the linkage head, protrudes into the output shaft and is accessible at the second end to make a connection between linkage head and output shaft.

A door closer assembly for an entryway device having a position sensor that assists in determining the location of the door closer assembly, and thus the location of the associated entryway device, relative to at least an entryway. The position sensor can be coupled to, and/or part of, the door closer assembly. Information obtained by the position sensor may be used by one or processing devices of an access control system to determine whether the door closer assembly and/or the entryway device is at the closed location, among other locations, as well as the direction(s) of displacement of the entryway device. Such information may be utilized in calibrating other devices, as well as determining the occurrence of a number of events, including unauthorized displacement or holding of the entryway device. A timer may also be utilized to further evaluate the nature of the displacement of the entryway device.

A combination door operator assembly and door, wherein the door operator assembly includes an operator unit mounted to the door on the pushing side thereof, an arm linkage having a driving arm and a driven arm, a second mounting bracket preferably on the frame of the door, a rechargeable power storage pack having at least one of a rechargeable battery and one or more capacitors, and a controller, for monitoring a speed and a position of the door, wherein when the door moves faster than a predetermined speed, the motor is used as a generator to charge the rechargeable power storage pack and the speed of the door is reduced.

A hidden closing door system comprising a rectangular coupling base, a traction axle, a closing control valve, an opening control valve, an adjustment valve, a driving spring, a shock absorber closing piston, a centering nut axle, a gum lock, a metal bush, a traction axle, a traction arm, an opening break, and a fixative screw.