Abstract:
A rotary damper with a housing, with a rotor rotatably mounted in a closed chamber of the housing and with a viscous medium disposed within the chamber, wherein the rotor is so formed and so cooperates with the wall of the chamber that with a relative rotation of the housing and the rotor, a braking effect is produced by the medium, and wherein at least two rotor elements are provided which are arranged coaxially, preferably commonly in the chamber, and the neighboring rotor elements are coupled such that they are freely rotatable relative to one another over a limited rotational angle.
Abstract:
An spring apparatus for use with an automatic swinging door closure system wherein the system includes a motor linked to a door via a gear train and a drive arm, the train including a plurality of gears including a first gear adjacent the motor, the motor driving the gears to move the door in either a clockwise or counter-clockwise direction and the apparatus for driving the gears in the direction opposite motor direction when motor power is cut off, the apparatus including a spring mounted within a housing which is linkable to the first gear in a first orientation to cause clockwise door movement and is linkable to the first gear in a second orientation to cause counter-clockwise door movement, the apparatus is easily modifiable so as to be configured in either of the first or second orientations and also includes a tension adjusting mechanism for adjusting spring tension.
Abstract:
An upright piano has a fall board for covering a keyboard, and a damper assembly is provided between a side arm and the fall board; the damper assembly includes a rotary damper generating large damping force during a turning motion in the counter clock wise direction and small damping force during the opposite turning motion and a link mechanism connected between the fall board and a shaft member of the rotary damper for changing the turning motion on the way between the closed position and the open position of the fall board; and a player is not expected to strongly support the fall board so as to prevent the fall board and the piano case from violent collision therebetween.
Abstract:
A damper assembly is provided between a side arm of an upright piano and a fall board for preventing the fall board from violent collision with a key slip, the damper assembly includes a rotary damper embedded into the fall board and producing small damping force during a rotation of the fall board from the closed position and a vertical position and large damping force during a rotation of the fall board from the vertical position to the closed position, a turnable plate member turnably connected to the side arm and not allowing the shaft member to turn with respect thereto, a stopper held in contact with the turnable plate member between the vertical position and the closed position and a spring generating resilient force larger than the small damping force and smaller than the large damping force so as to allow the turnable plate member to turn together with the rotary damper between the vertical position and an open position, and the damper assembly allows a player to move the fall board without large force.
Abstract:
A pneumatic device 10 comprises a piston 12 moveable along a cylinder 10. The piston has opposite ends 18, 26 defining a space 30 therebetween. The space is divided into two chambers 30a, 30b by a housing 40 fixed relative to the cylinder and having a fluid flow control passageway 42 therethrough. The space 30 is filled with fluid, such as oil. The piston 12 is arranged such that movement thereof against a spring 16 causes the fluid to be displaced from one chamber 30a of the space 30 to the other chamber 30b through the passageway 42. The spring 16 is arranged to apply a return force to the piston 12 and the rate of return of the piston 12 is controlled by the return flow of fluid through the passageway 42. A pneumatic system 100 includes a device 10 connected between first and second members 58, 58a of a building, such as a door and door frame. The pneumatic system comprises a source of compressed gas C for operating the device 10 to enable the device 10 to move the first member 58 relative to the second member 58a, ie to open and close the door. A switching device 72 controls the supply of compressed gas to the device 10.
Abstract:
A self braking door slide mechanism particularly adapted for use with cabinets that have front doors that open upwardly and are retracted using the slide mechanism to a position in which the door is aligned with the top of the cabinet in either an over or under top position. A dampening cylinder extends between the top of the cabinet and the door to slow its downwardly hinging action when the door is being closed. Auxiliary brake pads are also provided on a stationary slide member which bear against the moving portion of the slide mechanism to slow the sliding action during closing due to the force of the dampening cylinder.
Abstract:
A housing having a first cross-sectional shape includes an elongate passageway disposed between a sealed bottom end of the housing and a top opening thereof. Liquid is disposed in the elongate passageway. A pulley is mounted substantially above the top opening. A weight adapted to fit in the housing has a second cross-sectional shape that differs substantially from the first cross-sectional shape. A cable having a first end and a second end is entrained on the pulley, and a valve member is movably mounted with respect to the weight for directionally regulating a damping force associated with the movement of the weight through the liquid. The cable is attached to the weight at the first end of the cable. One of the housing and the second end of the cable is attached at a fixed location with respect to the door and the other of the housing and the second end of the cable is attached to the door. The weight moves upwardly through the liquid in the elongate opening with a first damping force in response to an opening movement of the door and the weight moves downwardly through the liquid in the elongate opening with a second damping force when the door is released thereby controlling the automatic closing of the door. Two molded plastic parts from a plug for the top end of the passageway and include cylindrical mounting surfaces for the pulley.
Abstract:
The invention is a pneumatic hinge which makes use of the air pressure action and counter balance to produce a spring-free hinge structuring to improve the ability to interrupt an opening or closing door at one's disposal of the traditional spring hinge, to eliminate its disadvantage as well as to produce more practical value.
Abstract:
A door hinge includes a hydraulic retarding device for cushioning the closing action of a door. The hydraulic retarding device has a cylinder body which confines a fluid operating space to receive hydraulic fluid therein. The fluid operating space includes a pair of longitudinally extending cylindrical spaces and an intermediate longitudinal passage provided between and communicating the cylindrical spaces. A vane unit is provided in each of the cylindrical spaces and has a blade which defines a longitudinal clearance with an inner surface of the cylinder body. A baffle extends longitudinally into each of the cylindrical spaces and is disposed between the passage and a respective one of the vane units. The baffles are substantially arc-shaped in cross-section and face away from each other. A gate valve is provided in the passage between the baffles. The vane units are operably associated with the door movement so as to open the gate valve to permit the hydraulic fluid to flow through the passage during a door opening action and so as to close the gate valve to prevent the hydraulic fluid from flowing through the passage and to permit the hydraulic fluid to flow only through the clearance between the vane units and the inner surface of the cylinder body in order to retard the movement of the vane units during a door closing action.
Abstract:
A cylinder type air damper includes a cylinder having at least one rib projecting radially inwardly and extending in the axial direction, a piston inserted for reciprocation within the cylinder and axially dividing the interior of the cylinder into a front compartment and a rear compartment. An exhaust hole axially penetrates the piston and is provided with a valve for blocking the exchange of air between the two compartments in response to an axial movement of the piston in one direction. An orifice also axially penetrates the piston within an area thereof subject to blocking by means of the valve for permitting the exchange of air between the two compartments in response to the axial movement of the piston. A vent duct communicates at one end with the orifice and is open at the other end within an area other than the area subject to blocking by means of the valve.