Abstract: According to the invention, there is provided a damper for a flapdoor that does not show any damping effect when its movable shaft of the damper is rotated with the door in one sense whereas it effectively damps the rotary movement of the flapdoor when the movable shaft is rotated with the door in the other sense, wherein a one-way clutch for engaging or disengaging the movable shaft with a movable member depending on the sense of rotation of the movable shaft to cause a viscous shearing drag in the viscous fluid contained in the damper and a power source constitute so many integral parts of a coil spring. A damper for a flapdoor having such an arrangement can have a simplified configuration as compared with a damper provided with a separate coil spring as power source and a separate one-way clutch and therefore can be realized with reduced dimensions.

Abstract: A door closer which comprises a damper having a body case including an arm fixed to a door, a rotational shaft formed in the body case, a pair of chambers filled with high viscous liquids, a pair of rotary blades respectively having passages with check valves on the rotational shaft, the rotary blades being rotated together with a rotational shaft by a sub case fixed with a sub arm against a return spring at the time of opening the door, the door being effected by the resistance force of the high viscous liquid against the closing door, a stationary plate fixed to the body case, an intermediate plate so engages as to be rotatable at a predetermined angle against the return spring, a movable plate so engaged with the sub case as to be rotatable together with the sub case, a plurality of rotary connectors respectively movably engaged with a plurality of through holes on the rotating circumferential line of the intermediate plate, and an angle clutch formed with recesses to be engaged with the rotary connectors

Abstract: The prevent invention is directed to improvements in vending machines of the type having an access door which is opened by a purchaser for removing a purchased article from within the machine.A two-stage hydraulic door closer is provided with a spring to return the access door through its arc of movement from the open to the closed position at a relatively slow, controlled, substantially uniform rate which allows a purchaser to open and release the door and then to remove an article from the interior of the vending machine with one hand without interference by the access door while the article is being removed.

Abstract: A door position indicator for a door closer which senses the position of a door closer piston as a means of sensing door position. The door closer and hence the door position indicator may be recessed in the door jamb over the top edge of the door thereby providing additional security to the door position sensing device.

Abstract: An improved door closer which prevents overly rapid closing due to an external force, such as wind pressure, being exerted on the door. A pair of oil holes are formed communicating with a first pressure chamber and a non-pressure chamber formed in the main cylinder of the closer. A slide valve is disposed in a communicating hole communicating with the oil holes and extending generally perpendicular to the cylinder. A head portion and a braking valve portion are formed on the valve rod of the slide valve at positions corresponding to the oil holes. An elastic member urges the slide valve in the direction opposite to the normal flow direction of the operating oil when the door is closing. An adjusting screw controls the position of the slide valve.

Abstract: A door closer and holder comprises a cylinder shell having a piston sealingly reciprocable therein. A spring biases the piston toward one end of the shell, and the piston is connected through the ususal apparatus to the door. At the one end the operating rod of a shuttle valve extends into the shell and is engaged by the piston as it approaches the end. The shuttle valve selectively directs the return fluid flow through sweep- and latch-control valves. The assembly also includes a solenoid-operated "bullet" which closes off the return flow to hold the door open. The angle of the openness at which the door is held may be selected by setting a cam on the holder drive pinion which engages a switch to activate the solenoid.

Abstract: A basketball goal for mounting on a backboard for providing absorption and dissipation of the energy occuring during a dunk shot or the like. The rim of the goal is pivotally mounted to the backboard and held in place by means of a spring and fluid filled hydraulic piston-cylinder mechanism which are mounted between the backboard and the rim. A downward force on the rim is opposed primarily by a vertical coil spring surrounding the cylinder. The cylinder and spring are coaxial with the axis being substantially parallel to the plane of the backboard. The downward motion of the rim opens a valve in the piston-cylinder allowing the cylinder to be moved upwardly with the downward movement of the rim with substantially no hydraulic restrictions. When the rim begins its return to normal position under spring pressure, the valve is closed. The piston has a predetermined diameter smaller than the inside diameter of the cylinder.

Abstract: A one-way damper has a rotor which is provided with a braking disc at one of its ends. The braking disc is received in a housing of the damper and the housing is filled with oil. The other end of the rotor extends outward from the housing and has a gear loosely mounted thereon. The gear is engaged with a coil spring. When the gear rotates in one direction, the coil spring is reduced in diameter so that it grips the rotor, making it possible for the torque of the gear to be transmitted to the rotor through the coil spring. When the gear rotates in the other direction, the coil spring is expanded in diameter so that it does not grip the rotor, making it possible for the gear to turn freely. The one-way damper is used in association with a lid or door to damp one but not the other of the opening and closing operations.

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 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 hydraulic door closer has a housing including a bore and a piston supported for reciprocal sliding movement within the bore in door opening and closing directions corresponding, respectively, to opening and closing movements of an associated door. The piston has a head at one end and an open opposite end which receives a portion of a spring which biases the piston in its door closing direction. First and check second check valves within the head comprise part of a fluid control system for checking movement of the piston during at least a portion of its travel in either its door opening or door closing direction.

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 door closer and holder has cylinders with pistons therein responsive to the relative swinging motion between a door panel and a door frame. A spring is loaded by door opening and acts against one piston to effect door closing. Various hydraulic passages opening into the cylinders have valves therein to control the door panel opening and closing speed or speeds. One of the valves, electrically operated, allows the door panel to close from a hold-open position.

Abstract: A closure for a pair of sliding doors is provided that allows a user to open and automatically close both doors of a pair of sliding doors. The doors can be operated individually or simultaneously. The closure includes a pivoting link having two members, one fixed to each door, and a biasing device for pivoting the members and closing the doors.

Abstract: A door closing device which is easily mounted on, and easily removed from, an offset pivot hinge. The door closing device has an outer sleeve, an inner member rotatably mounted in the outer sleeve and a coil spring having opposite ends thereof connected to the outer sleeve and the inner member, respectively. The door closing device is mounted on, and operatively connected to, the pivot hinge by non-rotatably fitting the inner member and the outer sleeve with a pivot pin of the pivot hinge and a hinge plate pivoted on the pivot pin, respectively .The door closing device is provided with a door closing speed damping mechanism, a door stopper mechanism, and/or a preset mechanism for the door closing torque, which are assembled within the outer sleeve.

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: A controlled release door holder comprises a housing having a portion defining a cylinder for containment of a fluid, a piston received in the cylinder for movement axially thereof and dividing the cylinder into first and second chambers, and a linkage between the piston and the door for moving the piston in the cylinder as a function of door movement. A spring compressed between the piston and housing biases the door toward the closed position.

Abstract: A hydraulically controlled door closer in which a spring cooperating with a piston reciprocatable in a fluid filled bore urges a closer shaft operatively connected to the piston to a position in which a door connected to the closer shaft is closer. The spring is tensioned during turning of the closer shaft in a door opening direction and may be releasably held in the tensioned condition by an additional piston located between one end of the spring and the first-mentioned piston and provided with a first passage therethrough in which a one-way valve is located in a second passage which may be closed and opened by an electromagnetically operated valve.

Abstract: A dash pot which functions to control a throttle throughout its movement and also functions as a throttle return spring comprising a cylindrical body in which a guide member and associated shaft are positioned with the shaft extending externally of the body and a chamber associated with the cylinder having a diaphragm defining one wall thereof. The chamber and cylinder are filled with an incompressible fluid and an orifice is provided between the chamber and the cylinder. A spring yieldingly urges the shaft inwardly. A check valve and orifice are provided in the body to restrict the flow of fluid as the guide member is moved inwardly and permit the relatively free flow of liquid from one side of the guide member to the other as the guide member and associated shaft are moved outwardly. The end of the shaft is connected to the throttle so that when the throttle is released by the operator of the vehicle, the return velocity of the throttle to idle position is controlled throughout its movement.

Abstract: An automatic door closer constructed for releasably holding a door in a predetermined partly open position mainly comprises a piston arranged in a cylinder bore of a housing and operatively connected to a closer shaft mounted in the housing turnable about an axis substantially normal to that of the cylindrical bore so that the piston will be reciprocated in the bore during turning of a door connected to the closer shaft. The piston divides the bore in the housing in two compartments filled with fluid and a coil compression spring in one of the compartments biases the piston to an end position corresponding to the closed position of the door. The piston is provided with two passages therethrough, in one of which a one-way valve is arranged permitting flow of fluid only from the one compartment into the other during movement of the piston in door opening direction.

Abstract: A releasable latch, for attachment to a door check unit having a cylinder and a piston, and serving releasably to secure a door in an open position. A lever is freely slidable along the rod of the piston and is tiltable on the rod for releasable locking engagement. A cam and follower are actuable from a pre-set position to tilt the lever into locking engagement when the door is opened beyond a predetermined limit and then released. On release of the lever from locking engagement with the piston rod the cam and follower are returned to their pre-set position.

Abstract: A door closer is connected to a door. The movements of the door cause a piston member in the door closer to pump a pressure medium through a flow duct. There is also a flow limiting member influencing at least the speed of the opening movement of the door, and this flow limiting member cooperates with an adjustable activating element which, at a desired opening moment mechanically sets the elements of the flow limiting member in a position considerably increasing the flow resistance of the pressure medium. This brakes the movement of the piston member, and thus, also the movement of the door.

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 operator mechanism includes a spring biased piston 5 having a non-return valve 6 in its end face slidably disposed in a hydraulic cylinder 3 and coupled to a door lever arm through a pinion shaft 11, a pinion gear 9, and a tooth rack 7 on the piston. If the door is opened beyond a normal angle a rod member 16 disposed within the spring 4 engages and compresses a resilient member 15 disposed between one end of the cylinder and the spring. The resilient member has a higher coefficient of resiliency than the spring and thus is not initially compressed thereby, and its restraining force increases sharply at high compression ratios, to thereby increasingly resist door overtravel.

Abstract: A door closer includes a cylinder-and-piston arrangement in which the piston is received in the cylinder for displacement between a rest position corresponding to a closed position of the door, and an end position corresponding to the fully open position of the door, through an intermediate position corresponding to a partly opened position of the door. The piston subdivides the interior of the cylinder into at least two compartments which are in communication with one another via at least two passages one of which is closable in any position of the piston by means of an electromagnetically operated valve, the other passage being open when the piston is between the rest and the intermediate position and closed when the piston is between the intermediate and the end position.

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.

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 closer of the kind having a piston slidably mounted in a bore containing hydraulic fluid and dividing that bore into damping and reservoir chambers. Drive means is connected to the piston to respond to sliding movement of the piston and translate that into rotary motion for driving door connected linkage. The piston is spring influenced in a direction towards the damping chamber, and fluid pressurized by the piston tending to move in that direction bleeds from the damping chamber through an escape port which is controlled by a biased and movable closure member. Normally the closure member is biased into a rest position in which it blocks passage of fluid through the escape port, but it responds to fluid pressure in the damping chamber to move into an open position at which fluid can bleed through the escape port.

Abstract: An improved spring hinge includes a capstan for securing one end of a torsion spring in a knuckle of the hinge. To prevent axial movement of the capstan out of the hinge knuckle and permit axial alignment of a radial cavity in the capstan with an aperture in the hinge knuckle, the capstan is provided with a shoulder which engages a projection extending into the hinge knuckle. Also disclosed is a frangible pin which removably extends through the aperture into the cavity to secure the capstan against rotation relative to the hinge knuckle.

Abstract: A hydraulic dashpot having a pressure tube with a port defining a metering orifice through which fluid is metered upon application of impact forces to a piston assembly slidable in the pressure tube, and wherein the pressure tube is rotatable for adjusting the position of the orifice relative to a spiral valve edge for varying the effective area of the orifice.

Abstract: Aligned hollow knuckles on a pair of hinge leaves form a cylindrical barrel. Spaced plugs inserted into each end of the barrel serve to keep the knuckles from separating and act as a pivot pin for the hinge. Bifurcated reduced inner portions of the plugs receive the ends of a coil spring therebetween. One plug is permanently secured to a knuckle of one hinge leaf. A pin secured to the other knuckle extends into the barrel and is carried within an annular groove in the adjacent plug. A stop in the groove limits the travel of the pin. Minimum tension is provided at all times in the hinge by the initial setting of the stops with respect to the pin. Additional tension is provided by a plug rotating means together with a second pin engageable with recesses in the plug and a bore in the hinge knuckle.

Abstract: A device includes a spring for biasing a door or other similar structure into a closed position and a fluid medium for damping movement of the door. The damping effect is achieved by compelling the fluid to pass from one chamber to another within a housing of the device by changing the volumes of the chambers, the spring itself being used to bring about the change in volume.