Abstract: A lock device for locking the sliding door comprises a first lock portion and a transmission portion. The transmission portion may move along relative to the first lock portion a predetermined path, so that the transmission portion may bring the sliding door to move along the predetermined path to open or close the sliding door. The transmission portion has a plurality of successively arranged mating portions for locking with the first lock portion. The first lock portion has a first position in which the first lock portion is locked with the transmission portion and a second position in which the first lock portion is released from the transmission portion. The transmission portion may be locked in different positions along the predetermined path by matching the first lock portion 110 with different mating portions, so that the sliding door can be locked in different positions.

Abstract: A door closer system is provided that includes a motor, a spring, a reduction gear set, and a rack and a pinion mechanism. The spring and pinion may be coupled to the rack, and the pinion may be selectively coupled to the gear set. The motor may be selectively mechanically coupled to the gear set. The pinion may rotate in a first direction via the rack as the spring is compressed in a second direction opposite the first direction as the spring is expanded. The motor is operable to rotate and act upon the pinion through the gear set, thereby rotating the pinion in the second direction and assist the spring in closing the door.

Abstract: When a first screen is displayed on a display surface, for a touch operation in which a duration time of a touch on the operation surface is less than a predetermined time, a function corresponding to the touch operation is not performed, and in response to a predetermined touch operation in which the duration time of the touch on the operation surface is at least the predetermined time, a first function corresponding to the predetermined touch operation is performed. When a second screen is displayed on the display surface, a second function is performed in response to a touch operation in which the duration time of the touch on the operation surface is less than the predetermined time.

Abstract: The present invention relates to a door jamb assembly comprising a door stop member movably mounted thereon, configured such that the door stop is selectively operable to move from an extended, door-engaging position into a retracted door-disengaging position, and where the door stop member is adapted to initially move directly away from the face of a door with which it is in contact during use. Associated methods, door assemblies and suchlike are also provided. The door jamb assembly of the present invention is of particular use in situations where a door may be barricaded.

Abstract: An electromechanical door supporting system for temporarily maintaining a door in an open position having: a) a housing with an electric motor in communication with a power source; b) a base plate sized to pass underneath a swinging door; c) the base plate extending away from the housing; d) the electric motor causing rotational movement in a rod extending from inside the housing, to outside the housing and over a surface of the base plate; e) a door supporting element extending perpendicular to the extended rod; and f) the door supporting element being attached to the extended rod at a proximal location and extending over the surface of the base plate to a distal end so that rotation of the extended rod causes the distal end of the door supporting element to elevate above the base plate to secure an opened door.

Abstract: A device for opening a door includes an electric motor on a base, a slider movable relative to the base along a rectilinear direction between a rest position and an open position, and a rod pushing against the door and movable relative to the base and the slider along the rectilinear direction between a retracted position and an extracted position. An actuating element resiliently pushes the rod towards the extracted position. A gearwheel transmission is arranged between the electric motor and a transmission device to cause movement of the slider into the open position. The gearwheel transmission includes a gearwheel having a non-toothed segment which disengages the slider from the electric motor when the slider reaches the open position. A recall element recalls the slider towards the rest position or the rod towards the retracted position when the non-toothed segment disengages the slider from the electric motor.

Abstract: Hinge device (1) with long reciprocating stroke of a front panel (P) and having a first member (3) assigned to be fixed to an appliance (A) and a second member (5) assigned to be fixed to a door (D) of the appliance; the second member is pivoted to the first member by means of a hinge pin (7). A connection means (9) is assigned to be fixed to the front panel for actuating the translation thereof along the door during the rotation of the latter between its extreme closing (C) and opening (O) conditions. The hinge device includes kinematic means (11) having one end movable in the first member and an opposite end provided with a ring gear (13) centrally and rotatably pivoted to the second member or to an element fixed thereto, by means of a respective first pivot pin (15).

Abstract: A device is provided for controlling the closing movement of a sliding door. The device comprises a housing (10) containing a spring (11) which is actuable to provide a pulling force to the closing movement of the door. The housing (10) also contains a damper (12) which is actuable to impart a damped resistive force to the closing movement of the door. Incorporated within the device is a gearing mechanism for converting the rate of the closing movement of the door into two or more rates of actuation of the damper over at least part of the door's travel.

Abstract: A rolling door operator comprises a rotary shaft, a centrifugal brake mechanism, and a unidirectional centrifugal mechanism, in which a latching tooth and plurality of slots are disposed around one end of the rotary shaft, and the unidirectional centrifugal mechanism includes an active pin with an axial latching face and a sliding face, the axial latching face being engaged with one of slots to latch the rotary shaft together only in the falling direction of a door curtain, and the sliding face having a bevel adjacent to the latching face to contact slidingly over the slots, so that the door curtain can be lifted up immediately in another direction, and without affecting normal opening function of the door curtain.

Abstract: A damper assembly includes a fixed rack gear, a rotary gear damper having a gear engaged with the rack gear and a tether movable with the damper along the rack gear and a tether connecting the damper and a movable object to be controlled by the damper. The tether includes enlarged integral ends to secure the tether relative to the damper and the article to be controlled by the damper. A constant force spring interconnects movement of the damper relative to the fixed rack gear.

Abstract: A door closer assembly is provided, including a valve regulating an amount of hydraulic fluid that flows through the valve. The amount of hydraulic fluid flowing through the valve controls a force generated by the door closer assembly on a door. A first sensor measures an angular position of the door, and a second sensor measures an angular position of the valve. The angular position of the valve determines the amount of hydraulic fluid flowing through the valve. A controller controls the adjustment of the valve based on the angular position of the door and the angular position of the valve.

Abstract: A concealed door closer includes a housing, an input shaft and an output shaft, the input shaft being connected to a motor, wherein a joining member is arranged between the input shaft and the output shaft, and two ends of the joining member are respectively provided with an upper connection piece and a lower connection piece, which are connected to a roller via vertical rotation shaft, and wherein both the input shaft and the output shaft are provided with a left connection piece and a right connection piece, which are horizontally connected to the roller via a horizontal rotation shaft. The components in the door closer have a simple structure and may be easily processed and assembled. The size of the joint after assembly is equivalent to that of the joining member, so the overall size is small.

Abstract: Provided is a retracting device in which dampers have improved durability and strokes of operation of the dampers are not reduced. A first slider 14-1 for assisting closing, a second slider 14-2 for assisting opening, and a damper base 22 are provided in an elongating base 12 to be slidable in a longitudinal direction of the base 12. The damper base 22 is disposed between the first slider 14-1 and the second slider 14-2. A first damper 24 is provided over between the first slider 14-1 and the damper base 22 and a second damper 25 is provided over between the second slider 14-2 and the damper base 22.

Abstract: An opening device for a door (16) of an article of furniture supported oscillatingly with respect to a body of the article of furniture by means of at least a hinge having elastic automatic closing means (14) comprises an expulsion organ (11) for the door (16) and a reloading mechanism of the expulsion organ (11), and is conformed such as to be applicable to a part from between the fixed part or the mobile part of the hinge, the reloading mechanism being operatively connected to one from between the expulsion organ and an element of the hinge which is mobile with respect to the reloading mechanism and being operatively and selectively connectable to another between the expulsion organ and the element of the hinge which is mobile with respect to the reloading mechanism during at least a part of the opening movement of the door (16) such as to cause a reloading movement of the expulsion organ (11).

Abstract: A power boost assembly is disclosed that can be used with a door actuator, such as a door closer. The power boost assembly is structured to store an energy during a first movement of a door and release the stored energy during a second movement of the door. In one form the power boost assembly can be structured as a module that can be added to an existing door and door closer installation. In one form the power boost assembly is used to increase a closing force imparted to a door to ensure a latching event.

Abstract: A catcher (2) provided in a door frame H? for capturing a striker body 1 moved from a near front side F when a door D? is rotated toward a reference position; a braking device (5); and a linkage device (3) for both are provided. The catcher (2) is provided to be reciprocatingly rotatable between a standby position and a rotated position, captures the striker body (1) at the standby position, and rotates forward to the rotated position. Braking of the braking device (5) is applied to a rotation toward the rotated position of the catcher (2) through the linkage gear member (30).

Abstract: A cushioning device for opening and closing of sliding shutters, particularly of sliding shutters for furniture, to be applied as a single item to each shutter or sliding partition, in order to be able to cushion an end part of their opening and closing movement. The cushioning device includes a cushioning box applied with brackets for support and sliding of the individual shutter; this box being equipped with two opposing braking devices of a rotary type, whose toothed hub directly meshes with a rack fixed to the box, each braking device being joined to its own slider guided by the box and being joined at one end by an elastic device with its opposite end joined to the other slider, both sliders being equipped with a hook for activating and deactivating the corresponding action of the final section of travel to be cushioned.

Abstract: A withdrawing mechanism includes a striker disposed on one of a swingable member and a main body, a catcher disposed on the other of the swingable member and the main body to capture the striker moving, and a damper for applying a damping force to a turning operation of then catcher toward the turned position. The catcher is turnable between a standby position and a turned position. The catcher is biased towards the standby position when at a position closer to the standby position than an intermediate position between the standby position and the turned position and biased toward the turned position when at a position closer to the turned position than the intermediate position. The catcher includes a hooking groove for the striker on a surface extending substantially perpendicular to a rotary shaft thereof. The hooking groove faces an introduction port toward the front side in the standby position.

Abstract: A withdrawing mechanism includes a striker disposed on one of a swingable member and a main body, a catcher disposed on the other of the swingable member and the main body, and a damper for applying a damping force to a turning operation of the catcher toward a turned position. The catcher includes a casing, a rotational plate having a hooking groove for catching the striker therein, and a spring attached between an attaching portion of the rotational plate and a fixing portion of the casing to pull and rotate the rotational plate. When the rotation plate catches the striker, the rotational plate rotates in a direction to pull the spring, and when the attaching portion passes a position on a linear line extending the attaching portion, rotational center of the rotational plate and fixing portion, the rotational plate is pulled to move the rotational plate to the turned position.

Abstract: A door hinge for a household appliance, the household appliance including a body and a door, the door being movable about a horizontal axis between an approximately vertical closed position and an approximately horizontal opened position. The door hinge includes a housing couplable to the body, a door lever pivotably mountable on the door for movement about a main shaft, a weight compensating spring and a closing spring. The weight compensating spring holds the door approximately in a position of equilibrium when the door is opened and the closing spring applies a self-closing force shortly before the door reaches the closed position and applies a closure maintaining force when the door reaches the closed position. Further included is a dampening device that either counteracts a closing force or an opening force.

Abstract: A door closer that integrally incorporates a door-opening-assistance device, and that therefore eliminates the need for unnecessary troublesome adjustment between parts, and whose number of parts is reduced, making said door closer compact. The door closer 1 includes a closer 1a that includes a pinion 5 that rotates in the forward and reverse directions when the door is opened or closed, respectively. A cylinder 9 is meshed with the pinion 5 and moves forward and backward. A closing spring 14 energizes the door in the closing direction via the cylinder 9 and the pinion 5. A opening-assistance device 1b that includes an opening spring 22 that stores an opening force in the door-opening direction due to the movement of the cylinder 9 when the door is opened. Locking mechanisms 27, 28, and 29, that—when the door is opened—lock the opening spring 22 under an opening-force-storing condition. An unlocking mechanisms 23 and 24 that—when the door is closed—unlock the locking mechanisms.

Abstract: A withdrawing mechanism includes a catcher 2 disposed on a main body with a swingable member D swingably assembled thereto and configured to capture a striker 1 moving from a front side when the swingable member D is swung toward a reference position; and a load response type damper 6. The catcher 2 is configured to be turnable forward and backward throughout between a standby position and a turned position and to capture the striker 1 in the standby position and turn forward up to the turned position. The damper 6 is configured to apply a damping force to a turning operation of the catcher 2 toward the turned position.

Abstract: In a damped closing mechanism for automatic shutting pull door, a door closing mechanism includes a screw wheel to store restoring force, a change over device and a brake gear to produce a damping effect is integrally combined and equipped on the frame of a moving door panel. The brake gear is to alleviate the actuating force and moving speed of the door panel provided by the screw wheel. The change over device is capable of changing the damping effect of the brake gear to generate nearby the closing position of the door so as to alleviate colliding speed and impulse of the moving door panel with the door post when shutting without affecting the pulling of the door panel before closing.

Abstract: A door closer that integrally incorporates a door-opening-assistance device, and that therefore eliminates the need for unnecessary troublesome adjustment between parts, and whose number of parts is reduced, making said door closer compact. The door closer 1 includes a closer 1a that includes a pinion 5 that rotates in the forward and reverse directions when the door is opened or closed, respectively. A cylinder 9 is meshed with the pinion 5 and moves forward and backward. A closing spring 14 energizes the door in the closing direction via the cylinder 9and the pinion 5. A opening-assistance device 1b that includes an opening spring 22 that stores an opening force in the door-opening direction due to the movement of the cylinder 9 when the door is opened. Locking mechanisms 27, 28, and 29, that—when the door is opened—lock the opening spring 22 under an opening-force-storing condition. An unlocking mechanisms 23 and 24 that—when the door is closed—unlock the locking mechanisms.

Abstract: A drive system for a moveable wing, especially for a door or a window, is described. The drive system includes at least one energy storage device by whose discharge of energy the wing is moved. The energy storage device is hereby controllable in its energy discharge by means of a control system. The control system has an electrically controllable control element. The motion of the wing is directly or indirectly detected by a sensor, whose output signal is fed into a regulating device, which controls the control element. The regulating device is realized in a way, that the influence of the control element, dependent on the motion of the wing, can change the energy discharge of the energy storage device.

Abstract: A closure mechanism C comprising a elongated push/pull member 1, a base part 2, a resilient element 4, such as a coil spring, a motion converting means 6, such as a rack-and-pinion gearing, comprising a rotary output element 6o and a rotary braking device 7, such as a centrifugal brake, comprising a rotary input element 7i directly or indirectly coupled to said rotary output element 6o at least during movement of the elongated push/pull member 1 towards said first position, so as to be rotated thereby. The elongated push/pull member 1 and the base part 2 are assembled to each other so that said elongated push/pull member 1 is guided in a translational motion relative to the base part 2 between a first and a second position. The resilient element 4 is placed between said first and base parts 1, 2 so as to urge the elongated push/pull member 1 towards said first position.

Abstract: This invention relates to an overhead door closer with slide arm assembly having a toothed pinion that is eccentrically supported and presents a circular rolling curve, which pinion meshes with a toothed rack arranged at a piston. The invention concentrates on a particular embodiment of the rolling curve and of the teeth of the toothed rack in adaptation to a toothing of the pinion. Furthermore, the invention concentrates on an improved embodiment of the delayed closing operation in order to achieve an optimized movement pattern of the piston within the housing of the overhead door closer with slide arm assembly.

Abstract: The present invention relates to a door closer, in a housing of which is received a sliding cylinder, the sliding cylinder is provided with teeth on an outer periphery thereof for meshing with a gear wheel of a door shaft, a sliding cylinder interiorly formed with inner wall serves to move relative to a piston of a piston shaft. At an end of the piston shaft is provided with an oil-replenishing cylinder that serves to replenish hydraulic oil to the sliding cylinder via a one-way valve.

Abstract: A hinge device of an information terminal, wherein the information terminal comprises a main body, a sub-body to be opened away from or closed to the main body while rotating about a hinge axis extending in one direction of the main body, and the hinge device for rotatably coupling the main body to the sub body. The hinge device comprises a driving part generating a driving force for rotating the sub body, and a clutch part for rotating the sub-body by the driving force of the driving part. When the sub-body rotates by external force, the clutch part prevents rotating force of the sub-body from being transmitted to the driving part. Such a hinge device configured as stated above allows the user to automatically open and close the sub-body of the information terminal by virtue of a driving motor provided therein, as well as to manually open and close it. Further, the user can freely adjust an opening angle of the sub-body to various angles, resulting in improvement in convenience of use.

Abstract: A self-closing slide is movable between an open position and a closed position. The slide includes a frame, a linear gear on the frame and a carriage configured for movement along the frame. A biasing element operably connects the frame and the carriage to bias the carriage to the closed position. A pinion gear is carried by the carriage and is positioned for movement along the linear gear with movement of the carriage along the frame. A damper is operably connected to the pinion gear and to the carriage and an engagement gear is operably mounted to the carriage and to the damper. The engagement gear is movable between a first, engaged position in which the engagement gear engages the damper and a second, disengaged position in which the engagement gear disengages the damper. When the carriage is moved from the closed position toward the open position, the engagement gear is in the second, disengaged position to disengage the damper so that the pinion gear rotates.

Abstract: A door closer includes a door shaft, a housing, a sliding member, a door-closing spring, a sliding board, a pair of sliding blocks, a cone member and a door-opening spring. The door shaft is utilized to drive a sliding member in a housing of the door closer. Between an end of the sliding member and the housing a door-closing spring is tensioned, and another end of the sliding member is engaged with a cone member and a sliding board respectively in turn, the cone member serves for cooperating with the a pair of sliding blocks in the sliding board each of which provided with an incline at an end and a spring respectively. The sliding blocks further have retainer portions corresponding to the housing of the door closer, between the sliding board and the housing a door-opening spring is disposed, the retainer portions can be locked and fastened to a side of the housing.

Abstract: Door check mechanism including a rack adapted to be coupled to and extend outward from the frame, a gear adapted to be arranged on the door, the gear having teeth and being arranged in engagement with the rack and a detent mechanism arranged in engagement with the rack and the gear for enabling the door to be positioned in a plurality of fixed positions and for preventing movement of the door to a different fixed position when a force exerted upon the door is below a threshold. The detent mechanism may include a cam having a pawl in engagement with the rack and a detent and a spring for biasing the detent against the gear to press the gear against the rack. The gear is rotatable along the rack which each position in which the pawl engages one of the teeth being a possible position of the door.

Abstract: A damping device (14) for movable furniture parts comprising a fluid damper which is in the form of a rotational damper (20) and which includes two members which are rotatably movable relative to each other, namely a housing and a drum disposed in the housing. A damping fluid, for example a silicone oil, is disposed in the housing. During the damping action one of the two members is rotated by an actuating member and the other member is held fast. The rotational damper (20) is radially displaceably mounted and during the damping action is pressed by the actuating member against a retaining element (17).

Abstract: Door check mechanism including a rack adapted to be coupled to and extend outward from the frame, a gear adapted to be arranged on the door, the gear having teeth and being arranged in engagement with the rack and a detent mechanism arranged in engagement with the rack and the gear for enabling the door to be positioned in a plurality of fixed positions and for preventing movement of the door to a different fixed position when a force exerted upon the door is below a threshold. The detent mechanism may include a cam having a pawl in engagement with the rack and a detent and a spring for biasing the detent against the gear to press the gear against the rack. The gear is rotatable along the rack which each position in which the pawl engages one of the teeth being a possible position of the door.

Abstract: A door closer assembly and a method for operating a door closer assembly. The door closer assembly includes a housing and a door piston guided in the housing. The door piston is operably connected to move a door. A spring piston is guided in the housing and is operable to assist movement of the door piston toward a door closing position. The spring piston is situated in the housing and is acted upon by a spring. The door closer assembly also includes a hydraulic control circuit containing hydraulic fluid which is operable to selectively eliminate a coupling of the door piston and the spring piston from one another during a portion of the travel path of the door piston in the housing. The door closer of the present invention improves the comfort of passing through a door by providing different transmission ratios and therefore, different moment curves.

Abstract: A non-rotatable pinion cap for use on a non-handed door closer where both ends of the drive pinion extend beyond the cylinder body. The pinion cap has one exposed edge for engaging the door or door frame surface and includes a christmas tree plug for attaching the pinion cap to a threaded hole in one end of the drive pinion. The plug can either be free to rotate with the pinion or it can be fixed to the cap. The slippage of the plug permits the drive pinion to rotate while the pinion cap does not rotate.

Abstract: A one-way damping system is provided for dampening the movement of a closure member when the closure member is moved in a first direction toward its opened position such that the closure member is opened at a controlled rate of speed, and for permitting the closure member to be moved in a second direction toward its closed position such that the closure member is able to be closed at an undampened or unrestricted rate of speed. The closure member includes a gear rack integrally molded therewith, and a rotary damper gear is movable into engagement with and out of engagement from the gear rack in order to provide the dampened and undampened movement modes. An idler gear or a pair of control arms are operatively associated with the rotary damper gear so as to ensure proper engagement and disengagement of the rotary damper gear with respect to the gear rack.

Abstract: A pivoting gear damper for use with a rotary damper includes a toothed gear rack movable between a first position and a second position corresponding to movements in first and second directions. A pivotal bracket is provided for rotation between first and second positions corresponding to movements of the gear rack in the first and second directions. The rotary damper has a toothed driven gear disposed on the pivotal bracket. One-way dampening means is disposed on the pivotal bracket for causing the toothed gear rack to be in meshed engagement with the toothed driven gear to produce a dampening force when the gear rack is moved in the first direction and for causing the toothed gear rack to be disengaged from the toothed driven gear to allow unrestricted motion when the gear rack is moved in the second direction. The one-way dampening means is comprised of a guide pin and a cam member.

Abstract: A device for generating a rotary return force includes a casing unit, driving and driven gear units disposed in the casing unit, and a torsion spring. The driving gear unit includes a driving axle mounted rotatably to the casing unit and a driving gear wheel mounted fixedly on the driving axle. The driving axle is adapted to be driven rotatably by a rotatable unit. The driven gear unit includes a driven axle mounted rotatably to the casing unit and a driven gear wheel mounted on the driven axle. The driven gear wheel meshes with the driving gear wheel. One of the driven and driving gear wheels is larger than the other one of the driven and driving gear wheels. The torsion spring has a first retaining end secured to the driven gear unit and a second retaining end secured to the casing unit. Rotation of the driving gear wheel in a first direction by the rotatable unit causes corresponding rotation of the driven gear wheel and winding of the torsion spring.

Abstract: The electro-mechanical drive includes an electric motor, a transmission and a restoring spring. To improve the capacity to close the door, particularly in the event of a power failure, a large coil spring used as the restoring spring surrounds the electric motor and transmission. The electric motor is short circuited when not powered in order to create a generator effect with consequent damping during movement of the door.

Abstract: A door closer is shown, which is installed between a door and a door frame, in a balanced door. The door closer is installed in a header of the door frame, and includes an operative connection to a hinge shaft upon which upper and lower door support arms pivot. The operative connection includes a first gear mounted on a check shaft which engages a second gear mounted on the hinge shaft. The second gear preferably has a larger effective diameter than the first gear whereby the limited rotation of the hinge shaft results in a greater rotation of the check shaft to fully utilize the closer functions.

Abstract: A device for closing swinging doors of the type utilizing a rotating member to compress a spring during door opening to store energy in the spring to effect a closing of the door is provided with a driving connection to a d.c motor/generator effective to cause rotation of the motor during a closing movement of the door. The motor/generator acts as a generator during the closing with the generated electrical energy fed back to the motor/generator to retard rotation of the rotor, providing a brake on the closing movement of the door. The feedback circuitry includes a switch disabling or diminishing the braking during the final degrees of closing movement as well as a variable setting device allowing control of braking force.

Abstract: A device for controlling swinging doors utilizing an externally powered motor to compress a spring during door opening to store energy in the spring. The motor is not used to open the door, but only to compress the spring, thereby utilizing a minimum amount of electrical energy and allowing for a very easy opening of the door. The motor acts as a generator during the closing of the door with generated electrical energy fed back to the motor to retard rotation of the rotor, providing a brake on the closing movement of the door. The feedback circuitry includes a switch for varying the braking during the final degrees of closing movement as well as a variable setting device allowing control of braking force.

Abstract: According to the invention, there is provided an input responsive damper comprising a worm wheel for being rotationally driven by an object of damping, a worm for being rotated by the worm wheel, a guide for movably guiding along the axis of the worm a worm support member rotationally supporting the worm, a biasing device for biasing the worm support member in the direction opposite to the direction of the biasing force of the worm wheel applied to the worm and a damping device having a combination of a magnet and a conductor arranged concentrically around the rotary axis of the worm, the magnet and the conductor rotating relative to each other, either of the magnet and the conductor being supported by the worm and the other being supported by a stationary member. This induction type damper provides greater than normal damping when greater than normal force is applied by the object of damping. Frictional type and fan type damping enhancement element are also disclosed.

Abstract: Herein disclosed is a continuous speed change type door check for closing a door, which comprises: a pivot pin made rotatable; a slider adapted to be linearly moved by the rotations of the pivot pin and to rotate the pivot pin when it returns; a coil spring for biasing the slider to return; a gear train for speeding up the rotations of the pivot pin; a brake connected to the gear train; and a one-way transmission clutch for operating the brake in a direction to close the door.

Abstract: Disclosed is a door control device that automatically repositions the driving shaft of the door closer toward and away from the door pivot, as the door opens and closes, as a means of modifying and improving the force required to open and close the door. Movement is accomplished by a double ended driving shaft having a sprocket gear on one end which drivingly engages a track which in turn repositions the slide mounted door closer to more favorable positions as the door opens and closes.

Abstract: A double-winged door spring is biased for closing with a mechanism for damping of the closure movement and includes a closure sequence control, particularly of a fire-resistant door, in which the damping of the movable door portion is accomplished through a hydraulic damping element with throttled overflow. The hydraulic damping element includes two oppositely controlled pressure chambers defined by a double-acting piston and a valve disposed in the overflow conduit connecting the two pressure chambers, the valve being actuated directly or indirectly through the stationary door portion. By the valve being disposed in the overflow conduit, actuation of the movable door portion can be inhibited until the stationary door portion is closed.

Abstract: A door check is disclosed which comprises a first arm pivotally attached at one end thereof to a door which is able to be opened and closed as desired; a second arm pivotally attached at one end thereof to the first arm, the other end of the second arm being pivotally attached to a door frame for supporting the door in such a manner that the door is able to be opened and closed as desired; a driving force storing spring retained by either the first or second arm and biased in response to the pivotal motion of the door in the opening direction so as to store force for driving the door in the closing direction; a gear train for transmitting the rotation of the door when opened to said driving force storing spring and also transmitting the driving force stored in the driving force storing spring to the door; a brake rotated by means of the force released from the driving force storing spring to apply a brake force to the force; and a speed increasing gear train coupled at its starting end to said driving force s

Abstract: A mechanical disk-type door closure wherein one end of the closure is connected to a door and the other end is pivotally connected to a door jam such that when the door pivots about its hinge. The closure includes a rod upon which a rack is formed to cause a pinion to rotate in one direction and which is in mesh with a gear so as to move the pinion out of contact with the rack. When the door closes, a spring moves the pinion into engagement with the rack and the pinion turns in a direction to rotate the gear which is subjected braking pressure so as to adjust the resistance to the closing motion of the door.

Abstract: A door closer is described in which transmission ratios which change in dependence on the closing angle can be realized by eccentric toothed elements. The toothed elements can have different profile offsets, moduli and flank angles along their respective pitch curves.