Abstract: A hinge for cold rooms, swing gates or the like includes a stationary support structure and at least a door movable between an open door position and a closed door position. The hinge comprises a box-like hinge body and a pin rotatably coupled to rotate about a first axis between the open door position and the closed door position. Closing means are provided for automatically returning the door, as well as a working fluid acting thereon to hydraulically contrast their action. The closing means comprise a cam element unitary with the pin interacting with a plunger element housed in an operating chamber defined within the box-like hinge body. The box-like hinge body has an elongated shape to define a second axis perpendicular to the first axis.

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 door closer with a self-powered control unit is disclosed. The control unit for the door closer includes a drive gear configured to rotate in response to movement of a door, and a chain arranged to cooperate with the drive gear to produce linear motion in response to rotation of the drive gear. At least one gear creates rotational motion from the linear motion of the chain to turn a generator and generate electricity to power the control unit. In some embodiments, a set of clutch gears is disposed between the chain and the gear creating the rotational motion from the chain so that only one direction of the rotational motion is transferred to the generator in response to movement of the door in any direction. The control unit can additionally include a power management circuit to store energy from the generator.

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 soft-closing device has a base, a cylinder, a slider and a resilient member. The base has a track channel and at least one guiding channel. The cylinder is mounted in the base and has a housing and an expansion rod. The slider is mounted slidably in the track channel, is connected pivotally to the expansion rod and has two holding arms, a positioning pin and a holding recess defined between the holding arms. The positioning pin is mounted slidably in the at least one guiding channel. The resilient member has two ends connected respectively with the base and the slider.

Abstract: A closing device that includes a latching member that when moved a given distance utilizes a gear to affect a mechanical advantage that results in an end of a biasing member being moved less than the given distance. The biasing member is used in moving a first drawer slide member to a closed position relative to a second drawer slide member, and use of the gear and the resulting mechanical advantage provide a smoother transition when the first drawer slide member is engaged or disengaged from the closing device.

Abstract: In automatically opening and closing an opening/closing member with regard to an opened/closed member via a hinge, a drive for this purpose mechanically independent from the opened/closed member is mounted on a side of the opening/closing member and so designed that it rotates together with the opening/closing member when it opens and closes; where the opened/closed member is in particular a main body of office equipment and the opening/closing member an original cover, and the hinge comprises at least a mounting member mounted on a side of the main body and a supporting member of original cover rotatably mounted on the mounting member. The drive mechanically independent from the main body is mounted on a side of the original cover and so designed that it rotates together with the original cover when it opens and closes.

Abstract: A retraction mechanism includes a striker provided in either a fixed body or a movable body which is movably supported by the fixed body; a catcher provided in the other body and engaging the striker at a predetermined moved position of the movable body to be capable of engaging and disengaging; and an urging device enabling to accumulate urging forces in a moving process of the movable body. The retraction mechanism retracts the movable body by the urging forces accumulated in the urging device in a state wherein the striker and the catcher are engaged. The retraction mechanism includes a guide device controlling a relative position between the striker and the catcher, and when the striker and the catcher change the relative position, the change thereof is absorbed by the guide device, so that the engagement becomes possible.

Abstract: Carrier car door assemblies respectively comprising a carrier car comprising a body, a door, a drive mechanism, a driven mechanism, and a magnetic release mechanism are disclosed herein. The carrier car travels along a track system between teller and customer stations to transport materials there-between. The door is connected to the body and movable between a door-closed position and a door-open position. The drive mechanism is connected to the body and to the driven mechanism so that the drive and driven mechanisms synchronously move between respective door-closed positions and door-open positions. The magnetic release mechanism is connected to the driven mechanism and moves from a magnetically coupled state to a magnetically de-coupled state when a user manually moves the door from the door-open position to the door-closed position. The magnetic release mechanism in the magnetically coupled state synchronously moves with the driven mechanism between door-closed and door-open positions.

Abstract: A first door corresponds to a first section of a vehicle and can open/close a first access to the first section. At least one barrier corresponds to a second door of the vehicle, where the second door corresponds to a second section and the at least one barrier can open/close a second access to the second section. The first section is connected to the second section to allow air to pass therebetween. A coupling between the first door and the at least one barrier operates the at least one barrier to open the corresponding second access in response to the first door being opened and operates the at least one barrier to close the corresponding second access in response to the first door being closed. The corresponding second access allows air to exit the first section and the second section as the first door is closed.

Abstract: A catcher (2) comprises a catcher stopper (21), a holding body (22) for holding a striker body (1), and a biasing body (23) for them. When the catcher stopper (21) is projected by the biasing body (23), the holding body (22) is located at the forward position in a non-holding state. When the holding body (22) is located at the backward position in a holding state, the catcher stopper (21) is retracted. An engaging hole (402) for the catcher stopper (21) is formed in a recess (MB). A biasing force is stored in the biasing body (3) when the catcher (2) is located at the reference position where the catcher stopper (21) is engaged with the engaging hole (402). When the movable body (M) is moved forward to the self-propelling start position, the striker body (1) is advanced into the holding body (22) of the catcher (2) at the reference position.

Abstract: A cover for either a left-handed or right-handed operating automatic door closer including a body, and a pinion shaft extending from the top of the body, the cover comprising: a housing including a wall and an open rear, the wall having a rear edge and having therein first and second slots, each of the slots extending forward from the rear edge; and a clip including a base complementary to each of the first and second slots, and a flexible hook including a first end connected to the base and a floating second end, the base of the clip being insertable into either one of the slots so that the base substantially fills the one of the slots and the clip is secured to the wall of the housing with the hook positioned inside the housing and opening rearwardly; the housing with the clip inserted into one of the slots being positionable over the door closer with the hook of the clip receiving the door closer; wherein, when the housing is positioned over the door closer, the pinion shaft extends through the first slot

Abstract: The invention relates to a regulating valve, which is attachable in particular in a bore, executed with a female thread, of a hydraulic door closer. The regulating valve has a body adjoined by a regulating area. The regulating valve also has a thread provided with an anti-rotation element. The thread, including the anti-rotation element, being screwed into the female thread of the bore. In order to provide a regulating valve of a simple design, in which any unwanted adjustment of the regulating valve during operation is excluded, the anti-rotation element of the regulating valve has a plastic material layer at the thread flanks of the thread. The plastic material layer cooperates with the female thread of the door closer.

Abstract: A closing system (1) for refrigeration cabinets comprises a plurality of panels (5) mutually connected telescopically and slidable between an open position, whereat the panels (5) are completely superposed, facing each other and aligned along an orthogonal direction (s) to a plane (X) of lay of the panels (5), and a closed position, whereat the panels are arranged along a direction (t) parallel to the plane (X) of lay of the panels, offset along an orthogonal direction to said plane (X); at least one element (14) supporting and guiding said panels (5) and at least one device (9) for actuating said panels (5). A closing system (1) can be coupled to each refrigerated compartment (3) constituting the refrigerating cabinet (2), to close, in reversible, access to the products contained within the compartment (3) and to minimise its thermal dispersion to the environment.

Abstract: A runner 5 including a striker 51 in a lower portion; a catcher 6 corresponding to the striker 51 and engaging a movable body 1 in a reference position R; and an urging device 7 storing an urging force when the catcher 6 is in the reference position R, are provided. The catcher 6 in the reference position R captures the striker 51 of the runner 5 stopped and engaged with a rail 2 in a self-propelling start position SA of the movable body 1, and upon this capture, an engagement between the catcher 6 and the movable body 1 is released. At the same time, due to a backward movement of the movable body 1 from the stop position SA, the catcher 6 is positioned in the reference position R again, and releases the striker 51 of the runner 5. An engagement between the runner 5 and the rail 2 is subsequently released.

Abstract: A door closer includes a housing; an output shaft supported by the housing and rotatable in opposite door opening and closing directions; a cam disc disposed in the housing and mounted on the output shaft; a damping piston disposed in the housing; an opening piston disposed in the housing; first and second force transmission rollers; and two fixing bolts extending in the axial direction of the housing and transversely to the axis of the output shaft. The fixing bolts being disposed on two opposite sides of the output shaft, respectively. Each of the can disc and the first and second force transmission rollers has a circumferential recess or comprises two pieces, the fixing bolts being disposed in the recesses or between the respective two pieces so that each of the damping piston and the opening piston is prevented from rotating with respect to the cam disc.

Abstract: A mechanical rate control device for mechanically dampening a telescoping hold open rod including an outer tube, an inner tube concentrically displaced within the outer tube. The inner tube includes a head portion and at least two friction pads surrounding the inner tube. Each of the at least two friction pads includes an internal surface which substantially complements an external surface of the inner tube.

Abstract: In order to provide an original cover closer capable of realizing not only a miniaturization of a driving part but also a low cost and an office equipment provided with the original cover closer, a closer automatically and manually supporting the original cover in an openable/closable manner with respect to a main body of the office equipment is composed of a hinge part and the driving part, in which the hinge part supports a rear portion of the original cover at a backward side of the main body and supports the original cover in an openable/closable manner with respect to the main body, and the driving part is formed of a drive arm that supports either or both left and right side portions of the original cover at a forward side of the hinge part of the main body, a driving force transmitting means that transmits a driving force to the drive arm, and a drive motor that applies the driving force to the driving force transmitting means.

Abstract: An automatic closing assembly for a sliding door has a base, an adjusting device and a housing. The base is mounted on the sliding door and has a mounting bracket and a connecting frame. The connecting frame is mounted on the mounting bracket and has a damper barrel. The adjusting device is connected to the base and has a handle, a screw shaft, and a resilient device. The handle is rotatably connected to the base and rotates the screw shaft. The resilient device moveably engages the screw shaft and is selectively retracted by rotation thereof. The housing is telescopically connected to the base, is mounted around the adjusting device and comprises two tubes connected respectively to ends of the resilient device to transmit a returning force to the door.

Abstract: A door closer housing includes a mounting bracket having a L-shaped cross section, a first leg mountable on a supporting surface, and a second leg connected to the first leg and extending perpendicularly therefrom. The door closer also includes a cover mountable on the mounting bracket to form a housing for accommodating a door closer mechanism, the housing having two opposite open ends, the cover having a U-shaped cross section. When each end cap is mounted onto one of the open ends of the housing, the end wall of said each end cap faces an outside of the housing, and the cover extends into a plane of the end wall of said each end cap.

Abstract: Disclosed is a pull strap assembly for attaching to a sliding closure such as a door on the rear of a semitrailer. The pull strap assembly comprises a first band attached to the sliding closure and a second band attached to the first band to prevent the first band from hanging out of the cargo enclosure when the sliding closure is in the closed position.

Abstract: A ranch gate arm assembly which incorporates a gate arm that is mounted to allow swivelling about a longitudinal pivot when an external man or machine force is applied to either side of the gate arm thereby inducing the gate arm to swing out, and two torsion springs, one assembled on each side of the ranch gate arm which push against correlating sides of the gate and push the gate back to a center position after the external force has passed completely through the opening. This gate arm assembly is equipped with a smoothing release assembly, which eliminates the jolt force caused by the quick returning of the gate assembly to the center position that the gate was originally in before the external force was applied.

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: A slide channel for a slide member of a door closer, includes a housing having a length and a longitudinal slot extending over the entire length of the housing. The housing includes a support wall, an end wall disposed opposite the support wall, and a top wall disposed opposite the longitudinal slot and connecting the support wall and the end wall. The support wall, the end wall and the top wall define an inner chamber for accommodating the slide member. The support wall has a first height, and the end wall has a second height which is less than the first height.

Abstract: An end cover for a housing of a door closer, comprising a cover housing. The cover housing includes a convexly curved end wall, two opposite convexly curved lateral walls coupled to each other by the end wall, and a flat covering wall connected to the end wall and the lateral walls. The end cover also includes an attachment device supported by the cover housing.

Abstract: A hinge with a hinge cup can be inserted into a boring in a furniture part. A damper housing is fixed onto the hinge cup, and the damper housing can be fastened onto or removably secured to the hinge cup. The damper housing is disposed at least partially outside the boring when the hinge cup is inserted into the boring in the furniture part.

Abstract: The invention relates to a closure means for holding closed a door which is able to hinge in a frame, comprising a securing means which can be positioned on a first edge of the closed door and also a tightening unit which can be positioned on a second edge of the closed door and a cable or strap which, when the door is closed, runs through a gap between the door and frame and is fastened at one end to the securing means and fastened at the other end in the tightening unit, the tightening unit comprising inter alia a base plate with an opening for feeding through the cable or strap and also a tightening mechanism for tensioning and holding under tension the cable or strap guided through the opening and a cap with a lock which can be positioned on the base plate so as to produce a seal around the tightening mechanism.

Abstract: A door closer includes an anchor assembly for mounting on a door frame, an actuator assembly for mounting within the thickness of a door which is hinged for movement between open and closed positions, an operating member coupled by a linkage to the anchor assembly and mounted for a range of movements between a retracted position and an extended position, a resilient driving apparatus arranged to exert a driving force on the operating member, a damper mechanism operatively connected to the operating member so as to damp movement of the operating member at least in a direction towards the retracted position, and a resilient thrust device arranged to exert an increased driving force on the operating member over a defined part of its range of movement as the operating member approaches the retracted position.

Abstract: A continuously blockable arresting device includes a housing and a shaft having an end received in the housing and which may be externally acted upon causing rotation thereof. The housing has a fluid-filled working space and two subchambers which can be connected to the working space. The subchambers lie next to each other. First and second pistons are guided respectively in a displaceable manner in the subchambers and can be displaced therein by a swash plate. The shaft is connected to the swash plate for rotating the swash plate. Respective control devices of the subchambers include blocking valves for respectively connecting the subchambers to the working space and passage valves for respectively connecting the working space to the subchambers.

Abstract: A door closer power adjusting device for a door closer having a spindle driven by a compressed spring with a movable plate for adjusting spring compression, or with a screw for adjusting spring compression, between a high and low level of compression. A powered unit moves the plate in a first direction to achieve the low level of compression and in a second direction to achieve the high level of compression. A switch activates the powered unit in the first direction and a first switch is engaged when the spring is compressed to the low level of compression to deactivate the powered unit. A timing circuit activates the powered unit in a second direction after passage of a predetermined time. A second switch is engaged when the spring is compressed to the high level of compression to deactivate the powered unit.

Abstract: A mechanical door closer (10) that includes a spring (20) mounted in a track (13) to urge the door (11) to a closed position. A brake assembly (24) controls that rate at which the door (11) closes. The brake assembly (24) includes a brake hub (25) that has ramp slots (32) that receive balls (33) that engage a braking shell (34) to cause the braking assembly (24) to frictionally engage the track (13) to thereby control movement of the door (11).

Abstract: A door closer includes a closer casing, a pivot unit, and a length-variable damping cylinder. The pivot unit includes a pivot axle, a cam member, and a cam follower member. The pivot axle has a drive end portion that extends into and that is retained rotatably in the closer casing, and a coupling end portion that extends out of the closer casing. The cam member is mounted co-rotatably on the drive end portion of the pivot axle. The cam follower member is disposed in the closer casing, and is acted upon by the cam member. The damping cylinder is disposed in the closer casing, and has one end coupled to the cam follower member and an opposite end anchored to the closer casing.

Abstract: A securing device for a window includes a fixed support, a slide rod pivoted to the window and displaceably passed through a transverse hole of the fixed support, and a knob screwed into an axial screw hole of the fixed support for securing the slide rod after the window is moved to an intended position; a pair of curved pads is used for protecting the slide rod from scratching of the fixed support; each pad has a curved main body with convex and concave sides, an engaging protrusion on the convex side, and several ribs formed around and connected to the engaging protrusion; the pads are respectively positioned in the axial hole, and the fitting cavity with the concave sides facing each other, and with the ribs being pressed against inner sides of the fixed support for preventing the pads from falling off.

Abstract: A jamb bracket for a door closing system having an arm structure ending out from a basal element with two securing segments hugging an edge or corner of a doorjamb. The basal element has snap-off grooves with a decreased thickness allowing the portion of the basal element beyond the snap-off groove to be broken off if not needed. Two additional snap-off grooves separate the basal element from the securing segments so that the securing segments may be removed if necessary. The arm structure has two receiving areas for the pin of the door closing system. The jamb bracket is adaptable to become either a corner bracket for a corner/ceiling door closing system or an in-swinging bracket for an in-swinging door closing system.

Abstract: Closing device, in particular for a body part on a motor vehicle, the body part being mounted pivotably on a base part, includes a spring element having a piston rod which is axially moveable within a cylinder to exert a closing force on the body part via a cable device, which engages on the body part. The spring element has, on its piston rod, a deflection pulley over which the cable device is guided, the end of the cable device being fixed with respect to the cylinder.

Abstract: A hood support piston stopper that is positionable in connection with the hood support piston assembly of a vehicle in a manner to prevent the piston rod of the hood support piston assembly from sliding back into the cylinder allowing the hood to move from the raised to the closed position. To maintain the stopper in a handy location under the vehicle hood of a vehicle with a faulty hood support piston assembly it would be a further benefit to have a tether for securing the stopper in an out of the way but readily accessible location under the vehicle hood.

Abstract: A door assembly includes a door frame having a horizontal header along the top thereof. A firestop extends downwardly from the header, the firestop has a plurality of sides defining a channel therein. The firestop has an at least partially open side to allow the channel to be open and receive a closer assembly. A door closer assembly is coupled to the door. The door closer assembly has a biasing assembly and an arm having a first end and a second end. The first end is rotatably coupled to the biasing assembly and is slidably coupled to the channel.

Abstract: A sliding resistance member (3) is interposed between a glove box (B) and a rod type air damper (21). It is assumed that when a glove box lid (L) corresponding to a open-close member starts opening, the rod type air damper (21) rotates while running idle in conjunction therewith, in a relation in which the rotary type oil damper (3) is positively interposed between the glove box (B) corresponding to the mounting shaft and the rod type air damper (21). However, since a braking force of the sliding resistance member (3) is applied to the side of the open-close member in a rotating section of the rod type air damper (21), an sufficient damper effect can be obtained even when the open-close member starts opening.

Abstract: A door securing device for securing screen door in an open position once it has been opened. The door securing device includes a housing comprising a perimeter wall. The perimeter wall defines an interior space of the housing. The housing is designed for being slidably positioned on a door rod of the screen door opposite a door cylinder of the screen door. A cable assembly is positioned in the interior space of the housing. The cable assembly is designed for being coupled to the screen door opposite the housing. The cable assembly is designed for drawing the housing towards the door cylinder whereby the housing engages the door cylinder and the door rod to maintain the door cylinder in position on the door rod for inhibiting closing of the screen door.

Abstract: An assembly (50) adapted to a reciprocative door closer device (10) and contingent door (62), the device (10) comprising a rod (16) and a body (12) having a biasing means (11) normally operating to comprise decreasing actuation and causing the rod (16) and door (62) towards a closed position (62-A); the assembly (50) including as extensible bracket (50-A) joined to a fixated bracket (50-B) and a spring means (54) capable of providing a counter biasing means (55) normally operating as substantially inactive, unless, said assembly (50) detects an excessive inward force (11-B) as exceeding said device (10), wherein said assembly (50) responsively opts to regulate the a increasing outward actuation (55-B) towards the closed position (62-A) and a decreasing inward actuation (55-A) towards the opened position (62-B).

Abstract: A reinforcement plate for use in attaching a doorjamb bracket to a doorjamb, the plate member having an aperture through which the arm of a conventional doorjamb bracket may be inserted. A plurality of holes in the plate member are available for receiving fasteners to secure the reinforcement plate to the doorjamb. The base of the conventional doorjamb bracket is received within an chambered area in the plate member so that the reinforcement plate lies substantially flush with the surface of the doorjamb. At least one opening in the reinforcement plate is positioned and shaped to allow a fastener to extend simultaneously through both the reinforcement plate and a hole associated with the doorjamb bracket so as to simultaneously attach both the reinforcement plate and the doorjamb bracket to the doorjamb.

Abstract: A structure of a hinge is provided. The hinge includes a main leave secured to a door frame and a subordinate leave joint with the main leave by a pintle and secured to a door. The main leave has a first helical surface in a lower knuckle and the subordinate leave has a second helical surface in a central knuckle engaged with the first helical surface. Further the first helical surface has a vertical end and a plurality of domes engageable with a vertical end and a plurality of semi-circular recesses. So that when the door is opened, it will gradually and slowly closed on its own gravity.

Abstract: A jamb bracket for a door closing system having an arm structure ending out from a basal element with two securing segments hugging an edge or corner of a doorjamb. The basal element has snap-off grooves with a decreased thickness allowing the portion of the basal element beyond the snap-off groove to be broken off if not needed. Two additional snap-off grooves separate the basal element from the securing segments so that the securing segments may be removed if necessary. The arm structure has two receiving areas for the pin of the door closing system. The jamb bracket is adaptable to become either a corner bracket for a corner/ceiling door closing system or an in-swinging bracket for an in-swinging door closing system.

Abstract: There is now provided a swinging door with a door closer having a slide rail at the door frame with a suspension system for adjusting the height of the slide rail with respect to the door frame. The suspension system comprises a height adjustment device, which comprises a threaded sleeve (5) that has a first female thread (5d) and a threaded bush (4) that has a male thread (4c). The threaded bush (4) can be screwed into the first female thread (5d) of the threaded sleeve (5) to adjust the height of the slide rail, and the slide rail (2) is located on the exposed side of the threaded bush (4).

Abstract: A check mechanism for a motor vehicle door includes a housing secured to either the vehicle frame or the door and a check arm secured to the other one of the vehicle frame and the door. The door check extends into the housing through an opening in the housing. A pair of opposed guides are located within the housing and engage opposite sides of the check arm. Each guide has a generally V-shaped portion, in cross-section, engaging the check arm to generally form a line contact between the guide and the check arm. Spring members such as elastomeric springs bias the guides toward each other and the check arm. The guides and the check arm are adapted to resist movement of the closure relative to the vehicle frame when the guide engages predetermined locations of the check arm. When the door is moved relative to the frame, the guides slide along the exterior surface of the check arm.

Abstract: A document holder (11) comprising a rigid planar board (21) having one side covered by transparent flexible cover (22), the board (21) and cover (22) at one end being held in a retaining clip (12), said clip (12) comprising a substantially planar tongue (31) with a channel (32) extending along one edge thereof with an opening (34) facing away from the tongue (31).

Abstract: A door closer with an oblong, one-piece body such to achieve a compact and aesthetic unit which can be produced with a minimum material consumption. The door closer has lateral faces which each have a curvature and/or bevel that shapes towards each other, which curvature or bevel starts at the lower surface and ends at the upper surface of the door closer. The door closer also has bearing blocks that are built between their fronts and the lateral faces ascending from the body's lower surface.

Abstract: An assembly (50) adapted to a reciprocative door closer device (10) and contingent door (62), the device (10) comprising a rod (16) and a body (12) having a biasing means (11) normally operating to comprise decreasing actuation and causing the rod (16) and door (62) towards a closed position (62-A); the assembly (50) including a hinge bracket (50-A) joined to a fixated bracket (50-A) and a spring means (54) capable of a ligamentous movement (55) normally operating as substantially inactive, unless, said assembly (50) detects an excessive inward force (11-B) exceeding said device (10), wherein said assembly (50) responsively opts to regulate increasing actuation towards the closed position (62-A) without cause to said rod (16), to dampen, protect, and compensate said excessive force (11-B) and return said device (10) and door (62) towards normal operation.

Abstract: A hydraulic backcheck valve system for controlling an opening cycle of a door closer has a housing with an interior chamber, at least one cylinder, and a piston that can reciprocate between a door closing stroke and a door opening stroke within the cylinder. One side of the piston faces a variable volume chamber in the cylinder and an opposite side of the piston faces the interior chamber of the housing. The backcheck valve system has a fluid passage with a port in fluid communication with the cylinder and an opening in fluid communication with the interior chamber of the housing. The port is blocked by the piston during at least part of the door opening stroke. A one-way valve is disposed in fluid communication with the fluid passage and permits fluid to flow freely during a closing cycle of the door closer and prevents fluid flow from the second passage during the opening cycle. A backcheck valve is disposed in fluid communication with the passage and with the variable volume chamber.

Abstract: A door closer includes a cylinder and a piston sliding along the cylinder with a piston rod extending from the cylinder, with the closer mounting at one end to the door and at a second end to the door frame. The door closer has a speed adjustment know extending from a first end for varying the closure rate. Adjustable mounting brackets provide for flexibility in mounting configurations and closing force. A door lock maintains the piston in an extended position and keeps the door open. The lock includes a washer sliding on the piston rod in a first position and locking the rod at a second position. The washer has a tab that engages an angled surface in the first position to prevent locking engagement with the piston rod. A rotatable end cap rotates the washer between the locked position and the unlocked position.