This disclosure is generally directed to a hydraulic door closer, and more specifically is directed to a hydraulic storm or screen door closer that has a fluid overflow chamber providing fluid volume and pressure control for both expanded and contracted fluid at different temperatures. The disclosed hydraulic door closer comprises a fluid overflow chamber adapted to hold sufficient fluid to maintain required operating fluid or oil levels at different temperatures, and to ensure proper closer performance under both extreme high and low temperature conditions.

The present invention provides a door closer control system that includes a door closer having a rack and pinion mechanism connected to a pair of shafts with different length and a pair of springs. The shorter shaft is attached to the pinion of the door closer and will rotate in conjunction with the pinion as the door opens or closes. The shafts have correspondent gears connected to the shafts. The rotation of the first gear will be meshing with the second gear on the second shaft. Electronic sensors are placed on both sides of the door to detect a presence of an object and are activated by the movement of the solenoids. The movement of the solenoids cause a set of springs in the system to engage and disengage from a link to allow free motion of the door.

An automatic return device for glass doors includes a hydraulic hinge assembly having a first base, a piston unit, a first drive axle and a first grip unit and a leaf positioning assembly having a second base, a slide seat unit, a second drive axle, and second grip unit. The first and second bases are connected to a doorframe. The piston unit and first drive axle are set in the first base. The first drive axle interacts with the piston unit to generate oil pressure. The first and second drive axles are connected to the first and second grip units that grip a glass door. The slide seat unit and the second drive axle are set in the second base. When the second drive axle pivots, the slide seat unit positions the second drive axle at a predetermined pivotal angle.

A valve mechanism according to certain embodiments includes an adjustment screw and a rotatable control knob coupled with the adjustment screw. The valve mechanism includes a feedback mechanism operable to provide at least one of visual feedback, audible feedback, or tactile feedback to indicate movement and/or a positon of the adjustment screw within a door closer body.

This disclosure is generally directed to a hydraulic door closer, and more specifically is directed to a hydraulic storm or screen door closer that has a fluid overflow chamber providing fluid volume and pressure control for both expanded and contracted fluid at different temperatures. The disclosed hydraulic door closer comprises a fluid overflow chamber adapted to hold sufficient fluid to maintain required operating fluid or oil levels at different temperatures, and to ensure proper closer performance under both extreme high and low temperature conditions.

A door closer comprises a housing mountable to one of a door or a door frame, an arm having a first end pivotally attached to the housing and a second end connected to the other of the door or door frame, the arm being movable between a neutral door position and first and second open door positions up to 180 degrees from the neutral position in opposite directions, and opposing first and second racks movable relative to each other and relative to the housing. Each of the first and second racks has a first end adapted to engage a piston within the housing. The door closer further comprises a pinion within the housing pivotally connected to the arm first end and engaging teeth of the first and second racks, a piston having a first end adapted to engage the first end of the first and second racks, and a spring compressible by an opposite end of the piston. Movement of the arm from the neutral position to one of the first or second door open positions rotates the pinion and urges the first end of the first or second rack into engagement with the piston first end, the piston compressing the spring until the door reaches one of the first or second door open positions, and movement of the arm from the neutral position to the other of the first or second door open position rotates the pinion in an opposite direction and urges the first end of the other of the first or second rack into engagement with the piston first end, the piston compressing the spring until the door reaches the other of the first or second door open position.

A hinge for the controlled rotatable movement of a closing element, such as a door, a door leaf or the like, anchored to a stationary support structure, such as a wall, a floor, a frame or the like. The hinge comprises a hinge body and a pivot defining a first axis reciprocally coupled to allow the closing element to rotate between an open position and a closed position. The hinge further comprises a working chamber defining a second axis substantially perpendicular to said first axis and a plunger element sliding within the working chamber along the second axis between a position proximal to the bottom wall of the working chamber and a position distal therefrom. The pivot includes a pinion member, whereas the plunger element includes a rack member engaged with the pinion member.

The present invention discloses a spindle with speed adjustment and automatic return device, included set up one resilient component, one cylinder, also one spindle and one cam of the same spindle on a base, between the cam and the resilient component set up one slider component, and one first rack set up on the slider component, both side of the cylinder set up with one cylinder rod and one flow adjustment valve, and one second rack set up on the cylinder rod, one gear set meshed in between the first rack and the second rack; the cam can follow spindle rotation and drive slider component move to the resilient component, to bring the first rack through gear set to drive the cylinder rod by the second rack, to make the cylinder through flow adjustment valve to suck the medium.

An apparatus for adjusting the force in a door operator or closer comprises an elongated housing and a spring therein connected to the door operator or closer. A spring collar is non-rotatable about the longitudinal axis of the housing and adapted to move linearly within the housing. A fixed adjusting screw extends along a longitudinal axis of the housing and the spring collar is slidable linearly along an outer surface of the adjusting screw. A nut is threadably engaged at a distal end of the adjusting screw and is rotatable about the longitudinal axis of the screw, the nut bearing on the spring collar during rotation. The spring collar bears on a distal end of the spring to vary the spring compression and thereby vary force applied by the door operator or closer. The housing has an opening in a sidewall through which the spring is visible, and the housing exterior surface includes markings indicating the degree of spring compression. An indicator is moveable along and visible from the exterior of the housing to indicate the compression of the spring.

The present invention provides a door closer control system that includes a door closer having a rack and pinion mechanism connected to a pair of shafts with different length and a pair of springs. The shorter shaft is attached to the pinion of the door closer and will rotate in conjunction with the pinion as the door opens or closes. The shafts have correspondent gears connected to the shafts. The rotation of the first gear will be meshing with the second gear on the second shaft. Electronic sensors are placed on both sides of the door to detect a presence of an object and are activated by the movement of the solenoids. The movement of the solenoids cause a set of springs in the system to engage and disengage from a link to allow free motion of the door.