Abstract: A door closer unit (100) including a cylindrical housing (10) with a partition (14) axially extending inside and having a first liquid path; a moving body (20) with a movable barrier (24) dividing the interior of the housing into first and second chambers, and a rotational shaft (21) having an upper end extending upward; a door return spring (30) applying a recovering force to the door in a direction opposite to the direction when the moving body's rotational shaft (21) or housing (10) rotates in one direction; a high-viscosity liquid filling in the housing; a control check valve for opening a second liquid path when the door is opened, and closing the second liquid path when the door is closed; a cover (40) rotatably supporting the rotational shaft (21) of the moving body (20) and sealing the upper portion of the housing (10); a speed controller (19) regulating the amount of the liquid when the door is opened or closed, thus controlling the speed of the door; and a door stopper (29) for stopping the door whe

Abstract: A valve element for operative association with a valve seat in a passage in a body in which the valve element is mounted, in use, the valve element comprising first and second portions connected together by snap-fit means, the first portion being screw-threaded for mounting it in said body, and part of the second portion interrupting said screw-thread of the first portion.

Abstract: The present invention discloses door closers provided with automatic latching in any position along the stroke, and delayed action mechanism together with a mechanism to switch on and off the automatic latching and the delayed action operation modes. The function, on which the automatic latching and the delayed action functions are based, are described in detail and examples of embodiments in door closers provided with either automatic latching or delayed action or both are also described.

Abstract: An improved multi-stage door closer for automatically closing a door after the door is opened, is disclosed. It contains a cylinder having three sections each with a different diameter, with the middle section having the largest diameter. A pair of speed adjusting mechanisms are provided which are sleeved about a piston rod placed inside the cylinder. Each of the speed adjusting mechanism contains a rotatable piston head, which will rotate with the cylinder, and a fixed piston head, which will not rotate with the cylinder. In a preferred embodiment, the rotatable piston head contains a radially extending groove in communication with an axially extending graded groove, and the fixed piston head contains a spiraled or serpentined O-ring that cuts across the axially extending graded groove.

Abstract: A hydraulic control system for automatically closing and opening a door is disclosed and has means for providing such opening and closing even if power is lost to the hydraulic control system. Further disclosed is a fluid control device of the hydraulic system which prevents the door from being opened or closed too quickly that might otherwise harm an individual that comes into the path of the moving door.

Abstract: There is provided an overhead door that is placed on the roof board of a cabinet or the like to which it is fitted when it is opened so that the space available within the cabinet may be maximized. The overhead door 8 is swingably secured to the inner lateral wall surfaces 4, 4 of the cabinet 1 by means of a pair of support arms 14, 14 such that the distal end of each of the support arms is rotatably secured to a rotary shafts 15 on the corresponding lateral wall of the cabinet and the proximal end is pivotably fitted to the inner surface of teh door at a position close to the lower edge thereof by way of a bracket 16.

Abstract: A door stop including an hydraulic cylinder connectable to one of a door assembly part, a stop piston longitudinally displaceable in the hydraulic cylinder and connected with another part of the door assembly by a piston rod, and two spring-biased closing pistons located in two separate conduits formed in the stop piston for communicating two, spaced by the stop piston, pressure chambers formed in the cylinder, with a limited length conduit being formed in the hydraulic cylinder and by-passing the stop piston for directly communicating the pressure chambers.

Abstract: A valve for regulating speed of operation of a door closer, includes an elongated hollow tubular body having a closed first end with driving provisions thereon, an open second end, and an orifice in its sidewall adjacent its closed first end; an endplug for a cylinder bore of the door closer, the endplug having an axial port in which the closed first end of the tubular body is rotatably supported and which provides a fluid tight seal about the outer surface of the tubular body; an annular valve seat adjacent the endplug, the seat being fixed against rotation, and having an open portion and a closed portion which provide varying degrees of occlusion of the orifice when the tubular body is rotated; and a seal plate check valve captured against a piston head and occluding an opening therein during closing, the plate also providing a seal about the outer surface of the tubular body near the open second end thereof.

Abstract: A multi-stage door closer for automatically closing a door after the door is opened; it contains a cylinder having three sections each with a different diameter. The middle section has the largest diameter. A pair of speed adjusting mechanisms are provided which are sleeved about a piston rod placed inside the cylinder. Each of the speed adjusting mechanism contains a rotatable piston head, which will rotate with the cylinder, and a fixed piston head, which will not rotate with the cylinder. By cooperated actions among the variously-sized sections of the cylinder and the pair of speed adjusting mechanisms, each speed adjusting mechanism can be separately adjusted to control the door closing speed at various stages of the door closing action. For example, the door closer can be designed such that the first speed adjusting mechanism is made to control the door closing speed during the first 10.degree.; whereas, the second speed adjusting mechanism is made to control the door closing speed after the first 10.

Abstract: A door closer of the kind which acts between a door hinge stile and a hinge jamb has a body for mounting usually in the stile, and from the body a spring-biased tension member extends for anchoring to the jamb. A hydraulic cylinder piston damper is interposed between the tension member and its biasing spring, the damper incorporating no unidirectional valve means and instead its piston being undersized relative to the cylinder by an amount predetermined by the viscosity of hydraulic fluid in the damper so as to allow fluid to flow restrictedly around the piston when the tension member is moved in door-closing and door-opening directions.

Abstract: A cabinet lid stay is provided including a pair of arms pivotally coupled with each other for relative angular displacement at first ends of the arms and the second end of one arm is pivotally connected to a stationery cabinet portion through utilization of a damper construction while the second end of the second arm is pivotally connected to the cabinet lid through utilization of a pivot connector including a twist lock connection with a fixture mounted to the cabinet lid, the twist lock connection between the second arm and the fixture defining a relative rotation pivot axis of release therefore disposed in the plane of the arms. In addition, the first arm and mounting therefore to the stationery cabinet portion includes coacting structure by which pivoting movement of the first arm relative to the stationery cabinet portion may be adjustably limited to thereby limit the angular positioning of the cabinet lid when in its full open position.

Abstract: A door holder that includes a holding member adapted to be secured between the door and a frame of the door. The holding member includes a lever that may be clamped in either a first released position in which the door is freed to be opened and closed or a second holding position in which the door is held open. A foot operated actuating means operated by a user controls the lever to move it into a clamping position to hold the door open.

Abstract: A furniture hinge has a hinge arm connectible to the body of a piece of furniture and a lever connectible to a closure for the furniture. The closure is movable between a closed position and an open position. A damping device is disposed between the hinge arm and the lever and includes a housing having a bellows-like first part and a second part secured to the hinge arm. A piston rides in the housing and divides it into first and second chambers. The piston is provided with flow channels which allow hydraulic fluid in the housing to flow between the first and second chambers. The piston is mounted on a rod which extends through, and is coupled to, the first housing part and is articulately connected to the lever. A sealing member likewise mounted on the rod is arranged to seal the flow channels upon movement of the closure to its closed position.

Abstract: A door apparatus with damper switch formed bya control function which supplies a soft operation of a door with combination of a spring tension and a friction of viscous oil in a damper switch,a guide function which supplies a rotation route from the operation of the door and a switching function by protrusion respectively thereinto, anda transferring moving pin which moves along the rotation route, whereby the door apparatus can be assembled easily by fixing the damper switch only and operated smoothly by tension and friction.

Abstract: A door closer wherein a housing defines a fluid-containing space for a reciprocable damping piston which divides the space into a first and a second compartment. The piston carries a check valve which is closed during movement of the piston in a first direction while the door panel is being opened and which is open when the piston moves in the opposite direction. A channel is provided in the housing to permit fluid to flow from the first compartment into the second compartment during a first stage of movement of the piston in the first direction.

Abstract: A door closer wherein a housing defines a fluid-containing space and rotatably supports a shaft which is articulately connected with a pivotable door panel. A piston in the housing divides the space into a chamber and a compartment and has a toothed rack which mates with a pinion on the shaft so that the piston moves in the housing in response to rotation of the shaft as a result of pivoting of the door panel and vice versa. One or more springs in the chamber bias the piston in a direction to pivot the door panel toward closed position. A channel in the housing establishes communication between the chamber and the compartment during an initial stage of movement of the door panel from closed position at which time the piston moves in a direction to reduce the volume of the chamber.

Abstract: A new type of hydraulic door closer is disclosed. The device of the present invention utilizes spring force and hydraulic pressure, and is equipped with a straightly extending arm instead of the conventional type of the folding arms. The advantages of the device of the present invention are that variations of the size of the device are not required for different sizes and weights of doors, and the lack of the folding portion of the arm enables avoiding of wear and stress on the critical parts. Another advantage of the device of the present invention is that different door opening ranges are provided such as 80 degrees, 90 degrees and 100 degrees in addition to a free moving zone.

Abstract: The present invention covers a door hinge equipped with a damper spring, composed of two cylindrical bodies, kept in place by their anchor plates with the door, respectively the door frame. One of the cylindrical bodies forms a watertight chamber by way of sealing plugs, inside which a piston is mounted, held laterally in the cylinder by longitudinal guides which prevent the piston from rotating. Said piston has a threaded axial bore by which it is mounted on a journal with a wide screw pitch, the journal being the end of an axial shaft which passes through a central perforation in one of the sealing plugs of the watertight chamber. All this is so designed that the turning of the second cylindrical body of the hinge caused by its being fixed to the door by its respective anchor plate, creates a torsion stress in a spring, while at the same time turning the axial shaft in the watertight chamber filled with oil-hydraulic fluid.

Abstract: A link is pivotally connected at one end thereof to one end of a case or main body of a door closer so that the link is turnable between a first position where it is received in the case and a second position where it is put outside the case. A roller is attached to the link, and a cam member is installed within the case. Also installed within the case is an urging spring which causes the cam surface of the cam member to abut against the roller, whereby the link is urged in the direction to be received in the case. The case has no oil enclosed therein. Thus, the construction of the case is simple and inexpensive. When the door is closed, the link is received within the case to improve the external appearance.

Abstract: A door closer is described in which transmission characteristics which change in dependence on the closing angle can be realized either by two pistons disposed coaxially within one another and displaceable relative to one another, or by eccentric toothed elements.

Abstract: A spring assembly for counterbalancing a door includes a compression spring and tension members engaging opposite ends of the spring. The tension members can be connected in a conventional horizontally pivoted door mechanism or a track-guided door mechanism, the assembly replacing ordinary tension springs of the pivoted mechanism. The tension members and the spring are maintained in axial alignment during compression of the spring, which can be preloaded as desired. Provision is made for an initial preload corresponding to a lowered position of the door, facilitating installation and adjustment of the spring assembly. The assembly is fail-safe in that the spring is completely enclosed and the spring, if broken, continues to provide support for the door. In the track-guided mechanism, the spring assembly is connected between an anchor and a driveshaft pulley by a cable that is wound onto the pulley.

Abstract: An automatic door/window closing device has a center shaft provided with V-shaped spiral channels to a base such as its surface and secured to a base such as the ground, a floating piston which forms a screw pair with the shaft by engagement of steel balls in the spiral channels, a housing with a flange which is secured to the door or window, a spring for providing the force to automatically close the door, and a cover. This device has a simple structure and is very light and which permits a door to be opened in both directions. After opening, the door will automatically close, and it can be also be damped for slowly closing the door. The door will rest when it opens to 90.degree..

Abstract: A hydro-magnetic door hold open device. A piston on a piston rod is slideably mounted in a cylinder that is mounted eccentrically inside a housing. The piston rod extends out of the housing and connects to a hingedly mounted door so that opening or closing of the door effects reciprocation of the piston within the cylinder. Both the housing and the cylinder within it are filled with hydraulic fluid. A ball valve positioned forwardly of the piston is confined within a valve chamber that has three seats; the inner cylinder is provided with apertures on the rearward side of the piston and forwardly of the valve chamber so that the ball valve is carried by the fluid into either of two of the seats attendant piston advancement or retraction and maintained in such seat by a pressure differential established in the fluid by the travel of the piston.

Abstract: A door closer has a first arm (4, 14) which is pivotally attached to the door case (2), a second arm (5, 15) which is pivotally attached to the door leaf (1), the opposite ends of the two arms being pivotally connected to each other (at C), and a spring biased driving device (6, 16) which is pivotally attached partly to the door case (at E), partly to the linkage system formed by the arm (4, 5; 14, 15). According to the invention the driving device (6, 16) is pivotally attached to the second arm (5, 15) at a distance from its joint (6) on the first arm (4, 14), and its joint (E) on the door case is located between the joints (A and B respectively) of the first and second arms (4, 5; 14, 15) on the door case and the door leaf respectively, the joint (B) of the second arm (5, 15) being located closest to the hinge joint (D) of the door.

Abstract: A door holding device for door closers is described in which a door is held only at a predetermined angle of opening and in which the selected holding position can remain unchanged over a long period of time but can nevertheless be released by electrical means. For this purpose the switching of the door is effected, starting from a known mechanical door holding device which can be switched in and switched out, via a control unit which is biased into a door holding position by the hydraulic pressure which is in any event present in the closer and which can be released again via a magnetic valve.

Abstract: An automatic door closer whose housing confines a reciprocable damper piston cooperating with a rotary shaft to rotate the shaft in a direction to close the door or to be moved by the shaft in response to opening of the door. The piston can be biased in a direction to close the door through the medium of the shaft by a strong coil spring as well as by a relatively weak second spring in the form of a torsion spring, an extension spring or a compression spring. The second spring ensures that the party opening the door invariably encounters some resistance to movement of the door from closed position as well as that the door begins to move toward the closed position as soon as the door opening force is reduced below the force of the second spring.

Abstract: A jamb plate is mounted between the jamb bracket of a conventional door closer and the door jamb to prevent the door closer from tearing away the door jamb.

Abstract: An oil type damper comprises a housing formed of a basic member in the shape of a blind tube and a cap, a rotating member and a braking disc adapted to rotate jointly and accommodated within the housing, viscous oil applied to the braking disc, and at least one flexible membrane opposed to the braking disc so as to allow the braking disc to be sealed in the housing as covered with the oil. In this oil damper, when the oil serving to brake the rotary motion of the rotating member connected to a given door expands in volume because of rising temperature, the flexible membrane is deformed under the pressure of the expanded oil enough to absorb the voluminal expansion of the oil and prevent otherwise possible leakage of the oil from the housing.

Abstract: A rotation damper comprises a base member, a gear wheel rotatably mounted on the base member via a damper, a spiral spring having one end attached to a cap member and the other end attached to the gear wheel and adapted to be wound up with the rotation of the gear wheel, and a locking member for locking the spiral spring in or releasing it from the wound-up state. When the gear wheel is rotated to the neighborhood of a limit position against the spring force of the spiral spring, the spiral spring is locked in the wound-up state. The spiral spring is released from the wound-up state by further rotating the gear wheel. The rotation damper is applicable to a cassette holder of a cassette tape recorder, for instance, and permits the holder to be opened and closed under braking force while eliminating the need for a separate holder locking mechanism.

Abstract: A rotary damper device comprises a base plate, a rotary cylinder rotatably disposed on the base plate through the medium of a damper, and a coil spring interconnecting the base plate and the rotary cylinder. The base plate and the rotary cylinder are interconnected to the main body of a device and the lid of the device. When the lid is opened or closed, the braking force of the damper and the resilient force of the coil spring cooperate to generate effective braking force and enable the opening-closing device to be opened or closed smoothly under the influence of the effective braking force.

Abstract: A releasable hold-open device for a spring-impelled, regulated door closer has a door motion follower adapted to be releasably held in a door-open position. An actuator is arranged to retain or release the follower under control of a permanent magnet that can be overcome by an electromagnet.

Abstract: The piston assembly of a hydraulically controlled door closer has a tubular wall, plugs secured in end portions of the wall and a separate rack secured inside the tubular wall between the plugs by formations on the plugs.

Abstract: A piston and geared rack assembly are moved by pressurized air in opposite directions within a power cylinder housing as the vehicle operator registers door closing and opening commands in a solenoid valve. This lateral movement is converted to rotary movement by a pinion gear driven by the rack and coupled to turn a spindle shaft which drives the door. At full stroke during door closing, the power piston actuates a valve to charge the lower chamber of an auxiliary cylinder to move a lift piston rod, movable within the spindle shaft, to raise the closed door into a locked position. Upon a door-open command, the solenoid valve exhausts the charged cylinder chambers, admits air into the upper chamber of the auxiliary cylinder to move the lift piston and rod to lower and release the door, and slowly charges the associated opening chamber. This enables the delayed movement of the power piston and rack assembly in the opposite direction, reversing the rotation of the pinion and spindle shaft, to open the door.

Abstract: A door-closing hinge comprising an upper barrel with a wing secured to the door and an aligned lower barrel with a wing secured to the door frame. A bolt rotatable in the lower barrel has a non-circular upper end fitting in a non-circular opening in the upper barrel and a lower stem portion of smaller diameter which extends to the lower end of the lower barrel and has in its lower end a central conical depression engaged by a pivot pin in the lower end of the lower barrel. At the upper end of the lower barrel there is a ball bearing between a threaded collar screwed into the upper end of the lower barrel and a washer on the bolt. A sleeve surrounding the bolt has inner pins slidably received in helical grooves in the bolt and outer pins slidably received in longitudinal grooves in the inner surface of the lower barrel so that when the door is swung from closed position toward open position the sleeve is moved upwardly against the force of a spring which tends to return the door to closed position.

Abstract: An automatic door closer has an elongated fluid-filled housing having a closed end and an opposite open end, a plug closing the open end of the housing, a first piston reciprocatably arranged in the housing and dividing the latter into a first pressure space adjacent the closed end and a second pressure space adjacent the plug, a closer shaft adapted to be connected to a door, extending transverse to the elongation of the housing and turnably mounted in the housing in the region of the closed end, elements connecting said closer shaft with said first piston for moving the latter during turning of the closer shaft in door-opening direction in a first direction reducing the volume of the first pressure space while increasing the volume of the second pressure space, the piston-moving elements comprising a piston rod slidingly guided in the first piston and having a free end facing the plug, a spring cooperating with the first piston for biasing the latter in a second direction opposite to the first direction, a

Abstract: A new breed of die cylinders operating at 1000-5000 psig. working fluid pressures and adaptable for use individually or by manifolding with punch presses to cushion dies can be operated with maximum rated pressure force against a force which a ram develops in one direction and in the opposite direction with partial pressure force which the die cylinders exert when force balanced. The following is accomplished by loading a piston underside by the same working fluid pressure when the piston bottoms inside a cylinder housing at the end of the ram induced stroke enabling an instant high pressure surge of fluid, be it Nitrogen gas or other working fluid, to enter the piston underside provided with a piston rod and exert a resistance force proportional to the net free area exposed thereto thereby providing force balanced cylinder operation.

Abstract: A rotary damping device has a shaft provided at one end with a rotor and the shaft also has a damping portion extending radially. The shaft is rotatably housed and accommodation spaces in the device are filled with oil. Located near to the opening of the shaft bearing is a radially extended sucker-shaped flange having a surface sloped axially forward. When the flange is contained within the accommodation space the rim portion of the flange presses against the front wall of the space to prevent damping oil leaking from the housing.

Abstract: An automatic door closer comprises a closer shaft connected to a door for turning therewith and being turnably mounted in the region of one end of an elongated fluid-filled housing. A cam disk fixed to the closer shaft cooperates over rollers carried by a slide to move the latter and a piston rod fixed thereto during opening movement of the door in a first direction. A first piston arranged in the housing divides the latter into a first and a second pressure space and is connected to the piston rod passing through a bore in the first piston for moving therewith in the first direction to thereby reduce the volume of the first pressure space while increasing the volume of the second pressure space. A coiled compression spring arranged about the piston rod biases the first piston to move in a second direction opposite said first direction. A second piston fixed to the free end of the piston rod projects beyond the first piston into a cylinder space formed in a plug closing the other end of the housing.

Abstract: A door closing apparatus includes a housing member defining a cylinder for receiving a reciprocable piston member. The housing also defines an opening for receiving a rotatable pinion meshing with teeth on the piston. The apparatus also includes a linkage assembly for operatively connecting the door closing apparatus between a door and a door frame. This linkage includes a drive member for rotating the pinion bidirectionally in response to respective opening and closing of the door. An adjustable biasing assembly is provided for urging the piston in a predetermined direction within the housing cylinder, and the housing is sealed to receive a predetermined amount of oil or other fluid for hydraulically regulating the piston motion. To achieve this regulation, the housing includes an arrangement of interconnected fluid carrying channels and one or more valve members are mounted in cooperation with the channels.

Abstract: The closing mechanism of an automatic door closing arrangement is partly enveloped by an elongated unitary casing of sheet metal. Flanges on two of the longitudinal casing walls bound therebetween an opening in the casing which may be closed by a panel releasably retained by the flanges. Provisions are made for attaching the casing to a door and for linking the output element of the closing mechanism to a door frame. The panel may be removed simply and without tools for access to the mechanism or for replacement by another panel of different decorative appearance.

Abstract: A door closer includes a horizontally disposed inner cylinder receiving oil therein, an outer cylinder surrounding the inner cylinder and receiving gas and oil in an annular spaced defined around the inner cylinder, a piston slidably fitted in the inner cylinder, a piston rod secured to the piston and extending out of the cylinders for connection to a door, a passage disposed at one end of the inner cylinder for communicating the interior of the inner cylinder with the annular space, a valve member movably mounted on the piston rod and normally at a position spaced from the piston for cooperating with the passage so as to reduce the effective passage area of the passage in the end portion of outward movement of the piston rod relative to the cylinders.

Abstract: A mechanism for use in counterbalancing the weight of a lid or closure incident to movements thereof between closed and open portions is in the form of a spring pressurized, hydraulic piston-cylinder arrangement. The mechanism preferably includes means providing hydraulic damping characteristics for both the fully extended and contracted conditions of the mechanism.

Abstract: A door closer has an inner cylinder receiving a piston slidably therein, an outer cylinder surrounding the inner cylinder to define a space therebetween, which space communicates with the interior of the inner cylinder at the opposite ends thereof, a piston rod extending from the piston out of one end of the inner cylinder and for connection to a door to urge it to the closed position, a valve mechanism disposed in the other end of the inner cylinder to control oil flow between the interior of the inner cylinder and the space. The door closer is mounted horizontally and a portion of the space is filled with high pressure gas.

Abstract: A door closing device of the type having a piston and cylinder is described, the piston being movable within the cylinder under the bias of a spring and being connected to an arm mechanism which is arranged to transmit movement of the piston into pivoting movement of a door and vice versa, the device including a number of by-pass channels arranged to bring portions of chambers separated by the piston into communication with one another, whereby to limit the speed of flow of a dampening medium contained in the cylinder and passing through the channels as the piston is reciprocated.