Positioning pull box door closer

Abstract

A positioning pull box door closer is composed of a pull box and a pull wire plate, the pull box on the positioning pull box door closer is installed in the middle of the upper edge of a door leaf or the middle of an upper door frame, the pull wire plate is installed in the middle of the corresponding upper door frame or the middle of the upper edge of the door leaf, and the outer end of a pull wire on the pull box is hinged to a cylindrical rod on the pull wire plate. And after the door leaf is pushed open, the door leaf can be positioned and kept still. When the door leaf needs to be closed, the door leaf is pushed open again, and the door leaf can be automatically closed.

Description

Technical Field

[0001] The invention relates to a door closer used on a room door. Background Art

[0002] In our daily life, there is a spring box door closer used on the door. The name of the door closer is the spring box. The spring box is the wire box. It is installed and fixed in the middle of the upper side of the door leaf or the middle of the upper door frame. The outer end of the wire on the wire box is connected to the middle of the corresponding upper door frame or the middle of the upper side of the door leaf. The spring box is the wire box, which has the same structural principle as the steel tape measure. The steel tape measure consists of an upper shell, a lower shell, a ruler, a ruler hook, and a turntable wheel. There is a cylindrical hole in the middle of the turntable wheel, which is installed on a fixed shaft set in the middle of the bottom of the lower shell. The main part of the steel tape measure is a circular plastic frame (turntable wheel). From the front, the plastic frame is wrapped with a tape measure in circles, and the inner side of the reverse side of the plastic frame is a spring sheet (also called a coil spring) wrapped in circles. One end of the spring sheet is turned into a hook shape and fixed in a small gap in the plastic frame, and the other end is bent into a ring and fixed in a small gap in the ruler box. There is a hollow column in the middle of the ruler box (called the fixed axis set in the middle of the bottom of the lower shell), and there is a small gap on the column. The groove around the turntable wheel is wrapped with the ruler, and the ruler is wrapped on the turntable wheel. The ruler can also rotate. Its center is pulled by the coil spring. When the ruler is pulled, the turntable wheel also rotates. When the external force of pulling the ruler is withdrawn, the coil spring reverses and pulls the ruler back to the turntable wheel. The ruler in the steel tape measure is a steel strip, and the structure in the wire draw box is the same as that of the steel tape measure. The difference is that the wire in the wire draw box is a thin steel wire rope. Some of the turntable wheels in the wire draw box are single-layered, with the same structure as the turntable wheels in the steel tape measure, and some of the turntable wheels in the wire draw box are double-layered. An annular sheet is provided between the upper and lower layers of the turntable wheel in the wire pull box, the upper part of the turntable wheel is wound with a thin steel wire rope, one end of a coil spring is connected to the lower part of the turntable wheel, and the coil spring is wound around the lower part of the turntable wheel, and the other end of the coil spring is arranged in the wire pull box or the other end of the coil spring is connected to the edge of the wire pull box shell.

[0003] When the door leaf is pushed open, the wire in the wire box is pulled out. When the external force pushing the door leaf is withdrawn, the reaction force of the coil spring in the wire box causes the turntable wheel to reverse, driving the wire to retract to the wire box, and the door leaf automatically closes. However, the existing wire box door closer has two disadvantages: First, when the door leaf is pushed open, the wire in the wire box is pulled out and elongated. When the door leaf is pushed open and rotated, the wire pulled out also rotates around the wire box. The wire pulled out from the wire box or the wire retracted into the wire box will rub against the pull outlet. Second, after the door leaf is pushed open, when the external force pushing the door leaf is withdrawn, the door leaf will move to close, and the door leaf does not have a push-open positioning function. Summary of the invention

[0004] The present invention aims to solve the disadvantage that when the existing spring box door closer is installed on the door and used, when the door leaf is pushed open, the pull wire pulled out of the pull box will rub against the pull outlet on the pull box, and the door leaf cannot be positioned and kept still when it is pushed open. The present invention provides a positioning pull box door closer, wherein the hinge shaft arranged on the pull box on the positioning pull box door closer is connected to the middle part of the upper side of the door leaf or the middle part of the upper door frame, and the outer end of the pull wire on the wire box is connected to the middle part of the corresponding upper door frame or the middle part of the upper side of the door leaf. When the door leaf is pushed open, the pull wire in the pull box is pulled out, the door leaf rotates, and the pull box connected to one end of the pull wire rotates around the hinge shaft hinged to the middle part of the upper side of the door leaf or the middle part of the upper door frame, and the pull wire pulled out of the pull box does not rub against the pull outlet. After the door leaf is pushed open, the door leaf can be positioned and kept still. When the door leaf needs to be closed, the door leaf is pushed open again, and the door leaf will automatically close.

[0005] The technical solution adopted by the present invention to solve the technical problem is that the wire in the wire box is a steel strip that can be curled and has a certain rigidity after being pulled out and can be used as a support rod. The cross section of the ruler wrapped in the groove around the turntable wheel of the steel tape measure is not a straight line. The front side of the ruler pulled out from the tape measure is concave and the back side is convex, so that the ruler has a certain rigidity when pulled out. When it retracts into the tape measure, there is a groove to smooth the surface of the ruler. Because the ruler is a steel strip and has elasticity, the smoothed ruler is still concave after being pulled out from the tape measure. If the pulled-out ruler is flat, the pulled-out ruler is easy to deform and bend, and it is not easy to measure objects, so the surface of the pulled-out ruler is concave. It can maintain a straight line shape within a certain length and is not easy to bend, that is, the concave surface on the pulled-out ruler has the function of maintaining the rigidity of the straight line shape. The ruler pulled out of the steel tape measure is a steel strip, and the steel strip (ruler) pulled out of the steel tape measure is straight. The straight steel strip is concave, and the thickness of the steel strip is 0.1MM. The straight steel strip has anti-bending rigidity. When pressed from both ends, the shorter the length of the straight steel strip, the greater the anti-bending force. The steel strip in the measuring tape is curled up for a long time and placed in the turntable wheel. When the length of a straight steel strip pulled out from the measuring tape reaches about 0.8 meters, the steel strip is a curved steel strip close to a straight line. When pressed from both ends, it has a certain anti-bending rigidity. When the pressure from both ends of the straight steel strip exceeds its anti-bending rigidity, the steel strip will bend from the concave surface. The anti-bending strength of a straight steel strip pulled out from the measuring tape is determined by factors such as the thickness, length, length of the cross section, and bending to the concave or convex surface of the steel strip.

[0006] The structure of the wire-drawing box: The wire in the wire-drawing box is replaced by a steel strip. The steel strips set in the wire-drawing box are the same as those in the steel tape measure. The wire-drawing box that pulls out the steel strips is also called a wire-drawing box. The steel strips set in the wire-drawing box are the same as those in the steel tape measure, both of which are concave on one side and convex on the other side. The straight steel strips pulled out of the wire-drawing box have anti-bending rigidity. When a section of the straight steel strip pulled out of the wire-drawing box exceeds a certain length and is pressed from both ends, the anti-bending force of the steel strip from the concave surface is small, and when it exceeds the anti-bending force of the concave surface, it will bend instantly and lose its anti-bending rigidity. If the two ends of a section of the straight steel strip are pressed, the anti-bending force of the steel strip from the convex surface is large, and when the pressure at both ends continues to increase, the curve of the steel strip bending from the convex surface continues to change, such as when drawing a bow, there is a certain range of curve deformation like the curve change of the bow. That is: when a straight steel strip is pressed from both ends, its bending resistance to the convex surface has a certain tolerance range. Installed in the middle of the upper door frame, the outer end of the steel strip is set in the middle of the upper side of the corresponding door leaf. After the door leaf is opened, it is pushed to the door leaf positioning position, and the upper steel strip retracts and stops. When a longer straight steel strip is pulled out of the wire box and pressed from both ends (the door leaf will automatically turn in the closing direction due to a slight wind or a slight shift in the center of gravity of the door leaf), the convex surface has a greater anti-bending force. The longer straight steel strip pulled out of the wire box is set as a support rod between the door leaf and the door frame to keep the door leaf in its original state.

[0007] A metal hook is riveted to the outer end of the steel strip. The metal hook is the same as the hook on the steel tape measure, with two faces close to right angles, one of which is riveted to the concave surface of the outer end of the steel strip, and the other is set on the convex surface of the outer end of the steel strip. The metal hook is set on a face of the convex surface of the outer end of the steel strip, and a metal cylinder is welded to it. The length of the metal cylinder is the same as the length of the cross section of the steel strip, and the direction of the hole of the metal cylinder is the same as the direction of the door leaf axis.

[0008] A straight steel strip is pulled out from the draw box, one end of which is connected to the turntable wheel in the draw box, and the other end of which is a metal cylinder connected to the outer end of the steel strip. One end of the metal cylinder is pressed against the other end of the draw box, so that the straight steel strip presents a convex bow shape with strong anti-bending force, and has a certain anti-bending force range. It can be connected between the door leaf and the door frame after the door leaf is opened and fixed as a support rod to keep the door leaf in its original state (the door leaf will not automatically rotate in the closing direction due to natural factors such as slight wind blowing or slight center of gravity shift of the door leaf). Of course, when a long straight steel strip is pulled out from the draw box and pressed from both ends, the concave surface also has anti-bending rigidity. After the door leaf is pushed open and fixed, the long straight steel strip pulled out from the inside is set between the door leaf and the door frame as a support rod, and the door leaf will not automatically rotate in the closing direction due to natural factors such as slight wind blowing or slight center of gravity shift of the door leaf.

[0009] Technical solution 1 of a stop member provided in the cable box: The turntable wheel on the spring box and the steel strip wound on the turntable wheel are the moving parts on the spring box. The rear end of the pawl is hingedly arranged on the shell of the spring box. The pawl is provided with a torsion spring so that the front end of the pawl has a downward force to press down on the surface of the moving part. The surface of the moving part is provided with a stop bar and an oblique stop bar in the positive direction of movement, through which the pawl slides in a positive direction. The oblique stop bar is arranged on the surface of the moving part in an inclined manner and forms a stop area with the stop bar. The steel strip on the pull box is pulled out to a set length (pushing the door leaf, the steel strip is pulled out to a set length), the pawl is pressed down on the surface of the moving part on the spring box to slide, the long cylindrical spiral spring in the middle of the torsion spring set at the hinge of the rear end of the pawl controls the front end of the pawl to slide into the set stop area, the external force of pulling the steel strip is withdrawn, the reaction force of the coil spring pulls the turntable wheel to reverse, and the pawl presses against the stop area, and the pulled straight steel strip is blocked and retracted into the pull box (the straight steel strip connected between the upper door frame and the door leaf is used as a support rod to position the door leaf so that it does not rotate). If the steel strip needs to retract, pull the steel strip again, and the pawl slides out from the stop area set on the surface of the moving part. When the external force of pulling the steel strip is withdrawn, the reaction force of the coil spring causes the steel strip to retract, the moving part reverses, the pawl slides to the stop area again and slides through the stop area from the inclined edge of the stop area, the front end of the pawl deviates to one side, and the reaction force of the spring set on the pawl restores the front end of the pawl that deviates to one side to its original position. The steel strip retracts into the spring box and the door closes.

[0010] When the steel strip pulled out of the wire draw box is pulled to a set length and the external force pulling the steel strip is withdrawn, the steel strip can be stopped and will not retract. When the pulled steel strip needs to be retracted, the steel strip is pulled again and the steel strip will retract into the wire draw box. The rear end of the pawl is hingedly arranged on the housing, the pawl can rotate around the hinge shaft, and the diameter of the hinged circular hole on the pawl is larger than the diameter of the hinge shaft. The front end of the pawl can swing toward the two ends of the hinge shaft. The pawl is provided with a torsion spring so that the front end of the pawl has a downward potential energy and is pressed against the surface of the steel strip. A stop area is provided on the surface of the steel strip, and the stop area on the surface of the steel strip is sequentially provided with a stop bar and an oblique stop bar that pass through in a unidirectional forward motion in the forward motion direction. The oblique stop bar is obliquely arranged on the surface of the steel strip and forms a stop area with the stop bar. Push the door leaf open to the positioning position (the steel strip is pulled out to the specified length), the pawl presses down on the surface of the steel strip on the wire draw box and slides, and the long cylindrical spiral compression spring in the middle of the torsion spring set at the hinge of the rear end of the pawl keeps the front end of the pawl facing the stop area without the influence of external force on the pawl, so that the front end of the pawl slides into the set stop area, the external force of pulling the steel strip is withdrawn, the reaction force of the coil spring pulls the turntable wheel to reverse, and the pawl presses against the stop area to prevent the pulled steel strip from retracting. The door leaf is pushed open to the positioning position, and the straight steel strip between the outer end of the steel strip and the turntable wheel passes through the pull-out outlet of the wire draw box. The pull-out outlet of the wire draw box is close to the back of the straight steel strip at the pull-out outlet, so that the end of this straight steel strip set at the pull-out outlet has anti-bending rigidity. The straight steel strip connected between the upper door frame and the door leaf is used as a support rod to position the door leaf so that it does not rotate. If the steel strip needs to retract, pull the steel strip again, and the pawl slides out from the stop area set on the surface of the steel strip. When the external force pulling the steel strip is withdrawn, the steel strip retracts, the turntable wheel reverses, and the pawl slides to the stop area of ​​the steel strip and slides through the stop area from the inclined edge of the stop area. The front end of the pawl deviates to one side, and the reaction force of the spring set on the pawl to control the direction of the front end of the pawl makes the front end of the pawl that deviates to one side return to its original position. The steel strip retracts into the spring box, and the door leaf closes.

[0011] Technical solution 2 for stopping and retracting the steel strip after it is pulled out: When the steel strip pulled out of the wire box is pulled to a set length and the external force pulling the steel strip is withdrawn, the turntable wheel can be stopped and reversed to prevent the steel strip from retracting, and the steel strip needs to be pulled again when the pulled steel strip is retracted, and the steel strip will retract into the wire box. The turntable wheel on the wire box and the steel strip wound on the turntable wheel are moving parts on the wire box. The swing rod is hinged in the wire box housing, and a small cylinder arranged at the front end of the swing rod has a downward pressure and is vertically attached to the sliding track arranged on the surface of the moving part in the wire box. When the steel strip on the wire box is pulled out to a set length, the turntable wheel rotates forward, and the front end of the swing rod slides on the sliding track arranged on the surface of the moving part in the wire box, and the front end of the swing rod arranged on the sliding track slides forwardly and unidirectionally through the bar to control the front end of the swing rod to slide into the stop zone (the stop zone is the surface through which the front end of the swing rod slides forwardly and unidirectionally). At this time, the external force pulling the steel strip is withdrawn, and the reaction force of the coil spring causes the moving part to reverse, and the front end of the swing rod is stuck in the stop area and slides, and the moving part is stopped and reversed. It is necessary to retract the pulled steel strip into the wire drawing box, pull the steel strip again, and the moving part continues to move forward. The front end of the swing rod slides out of the stop area, and the external force pulling the steel strip is withdrawn. The front end of the swing rod slides toward the stop area and slides through the stop area from the edge of the stop area, and then the front end of the swing rod set on the sliding track set on the surface of the moving part slides through the bar and returns to the original position, and the steel strip is retracted into the wire drawing box.

[0012] Description of the anti-bending of the connection between the straight steel strip and the wire box: The diameter of the groove around the turntable wheel is 60MM, the steel strip is wrapped around the groove around the turntable wheel and is wrapped 5 times, and the length of the steel strip is 0.9 meters. The thickness of the steel strip is 0.2 to 0.3MM, the width of the steel strip is 26MM, and the concave depth of the steel strip is 8MM. The steel strip is thick, wide, deep, and has strong anti-bending rigidity. The width of the door leaf of a family door is generally 0.8 meters. When the door leaf is pushed open, the door leaf is generally pushed open to between 90 degrees and 110 meters. The steel strip connected between the middle of the upper edge of the door leaf and the middle of the upper door frame is pulled out and the set length of the pull-out is about 0.7 meters. The steel strip is pulled out of the draw box to a set length (the length of the door leaf pushed open to position), the external force pulling the steel strip is withdrawn, the turntable wheel in the draw box is stuck or the steel strip is stuck, preventing the pulled straight steel strip from retracting into the draw box due to the reaction force of the coil spring. One end of the pulled straight steel strip is connected to the turntable wheel in the draw box, the outer end of the steel strip is hinged to the draw plate, and the pull-out port on the draw box is on this straight steel strip. There is a gap between the edge of a circle around the turntable wheel and the edge of the draw box shell. The steel strip is pulled out four circles from the turntable wheel, and there is another circle of steel strip around the turntable wheel. The outer end of the pulled straight steel strip on the draw box is hinged to the cylindrical rod on the draw plate, and the other end of the straight steel strip is connected to the turntable wheel. The connection point where the straight steel strip is connected as a straight line and the turntable wheel as a circle is the tangent point.

[0013] The ratchet provided in the wire drawing box presses on the stop zone provided on the convex surface of the steel strip wound on the turntable wheel to prevent the steel strip from retracting into the wire drawing box. A section of the steel strip between the stop zone of the steel strip and the pull-out outlet of the wire drawing box sticks to the turntable wheel when the steel strip is pulled outward. When the steel strip is pushed from the outer end of the straight steel strip to the other end connected with the wire drawing box, the section of the steel strip between the stop zone of the steel strip and the pull-out outlet changes from sticking to the turntable wheel to expanding outward around, and a section of the straight steel strip between the turntable wheel and the pull-out outlet also expands outward to fit a section of the side surface of the shell edge at the pull-out outlet of the wire drawing box (a side surface parallel to and close to this section of the straight steel strip). A section of the side surface of the shell edge at the pull-out outlet of the wire drawing box parallel to this section of the straight steel strip keeps the straight steel strip at one end of the pull-out outlet having bending rigidity. Alternatively, the wire drawing box is not a square block, and a section of the edge side surface of the straight steel strip from the pull-out outlet of the wire drawing box to the connection of the turntable wheel corresponding to the shell edge is an arc side surface. When the straight steel strip pulled out from the wire pull box is pushed from the outer end toward the end connected to the wire pull box, a section of the steel strip between the steel strip stopping area and the pulling outlet in the wire pull box changes from being attached to the turntable wheel to expanding outward toward the edge around the shell body, and the end of the straight steel strip connected to the turntable wheel separates from the turntable wheel and approaches the edge of the shell body. The straight steel strip at the pulling outlet of the wire pull box is leaned against the pull outlet and maintained in the wire pull box to maintain a straight shape that is resistant to bending.

[0014] Alternatively, the turntable wheel is stuck, which is the same as the principle of setting a stop area on the steel strip to stop the steel strip, and will not be repeated. The steel strip has a certain toughness and rigidity. When the pulled straight steel strip is pushed from the outer end to the other end connected to the wire draw box, the pushing force is 9.8N. The circle of steel strip wrapped on the turntable wheel expands from the turntable wheel to the edge around the wire draw box shell, and the connection between one end of the straight steel strip and the turntable wheel is also separated from the turntable wheel and expands to the edge around the wire draw box shell. The pull-out port of the wire draw box is against the back of the straight steel strip set at the pull-out port, so that the end of the straight steel strip connected to the wire draw box has anti-bending rigidity. After the door leaf is opened, it is pushed to the door leaf positioning position and no longer pushed. The stop member set in the spring box stops the rotating disk wheel. When the straight steel strip pulled out from the pull box is pressed from both ends, the pulled straight steel strip has the rigidity of anti-bending. When the anti-pushing force at both ends of the straight steel strip is not large (such as: the force that the door leaf will automatically rotate in the closing direction due to slight wind blowing or slight shift of the center of gravity of the door leaf), the straight steel strip pulled out from the pull box can be set as a support rod between the door leaf and the door frame to keep the door leaf in its original state. When the door leaf rotates in the closing direction due to slight wind blowing or slight shift of the center of gravity, the straight steel strip connected between the door leaf and the door frame has the rigidity of anti-bending and acts as a support rod to keep the door leaf from rotating in the closing direction due to slight wind blowing or slight shift of the center of gravity of the door leaf. There is little gap between the edge of the wire pulling box shell and the edge around the turntable wheel. When the outer end of the pulled straight steel strip is pushed into the wire pulling box, the steel strip in the wire pulling box does not bend or deform much, and the length of the pulled straight steel strip retracted into the wire pulling box is short.

[0015] The technical solution of the wire draw box being hingedly arranged in the middle of the upper side of the door leaf or the middle of the upper door frame: the outer end of the steel strip is arranged at the pull-out outlet of the wire draw box, and the outer end of the steel strip is pulled out from the wire draw box to form a straight steel strip, and the point where one end of this straight steel strip is connected to the turntable wheel is the tangent point between this straight steel strip and the turntable wheel, and the pulled-out straight steel strip does not rub against the pull-out outlet of the wire draw box. The wire draw box is installed on the gatehouse as a door closer. The wire draw box is installed and fixed in the middle of the upper door frame or the middle of the upper side of the door leaf, and the outer end of the steel strip on the wire draw box is hinged in the middle of the upper side of the corresponding door leaf or the middle of the upper frame. When the door leaf is pushed open and rotated around the door leaf axis, the steel strip pulled out from the wire draw box is pulled out and elongated, and one end of this straight steel strip rotates around the wire draw box. This steel strip is not a straight line, and the steel strip will rub against the pull-out outlet when it is pulled out from the wire draw box or retracted to the wire draw box. Therefore, the steel strip pulled out from the wire pull box does not touch the pull-out outlet of the wire pull box, and the steel strip pulled out from the wire pull box must be a straight steel strip.

[0016] Technical solution for hinged wire draw box: The wire draw box is a plate-like body. When the wire draw box is placed horizontally, the top and bottom surfaces of the upper and lower planes face upward and downward respectively. When the wire draw box is placed vertically, the bottom surface is perpendicular to the horizontal plane. The wire draw box is hinged horizontally, vertically or obliquely in the middle of the upper door frame or the middle of the upper edge of the door leaf. The outer end of the steel strip on the wire draw box is hinged in the middle of the upper edge of the corresponding door leaf or the middle of the upper frame. The straight steel strip pulled out from the wire draw box does not touch the pull-out port of the wire draw box. A section of the straight steel strip pulled out from the wire draw box is perpendicular to the door leaf axis, the hinge axis of the wire draw box and the upper door frame or door leaf, and the vertical cylindrical rod on the wire draw plate. The hinge axis provided on the wire draw box is perpendicular to the straight steel strip pulled out from the wire draw box and not in contact with the pull-out port, and the hinge axis provided on the wire draw box, the cylindrical rod provided on the wire draw plate and the metal cylinder provided at the outer end of the steel strip are all on the straight line of the straight steel strip pulled out from the inside and not in contact with the pull-out port. When the door leaf is closed, the pull-out port on the wire draw box and the cylindrical rod provided on the wire draw plate are in the same plane and close to and corresponding to each other, and the metal cylinder provided at the outer end of the steel strip on the wire draw box is sleeved on the cylindrical rod provided on the wire draw plate.

[0017] The wire draw box is hinged horizontally, vertically or obliquely in the middle of the upper door frame or the middle of the upper side of the door leaf. Take the wire draw box that is hinged horizontally in the middle of the upper door frame or the middle of the upper side of the door leaf as an example: a hinge shaft is set on the wire draw box, and the hinge shaft is set on the straight line of the straight steel strip that is pulled out from the pull-out port and does not touch the pull-out port, and is perpendicular to this straight line. (This straight line is the straight line of the straight steel strip from the pull-out port to the connection of the turntable wheel and then extended to both ends.) A cylindrical cylinder mouth is set on the wire draw box, and the two ends of the cylindrical cylinder mouth pass through the surface of the upper shell and the surface of the lower shell respectively, or a cylinder is set on the edge of the wire draw box, and there is a cylindrical cylinder mouth on the cylinder, and a hinge shaft is installed on the cylindrical cylinder mouth set on the wire draw box. The hinge shaft is set on the straight line of the straight steel strip that is pulled out from the pull-out port of the wire draw box and does not touch the pull-out port, and the hinge shaft is perpendicular to this straight line. Alternatively, a fixed axis is vertically arranged on the outer surface of the upper shell of the wire pull box (one end of the fixed axis is fixed to the upper shell by heat melting or adhesive connection), and a fixed axis is vertically arranged on the outer surface of the lower shell of the wire pull box (one end of the fixed axis is fixed to the upper shell by heat melting or adhesive connection). The central axes of the two fixed axes are on a straight line, and the two fixed axes represent two straight lines extending from each other to form a straight line. The two fixed axes on a central axis are arranged as hinge axes on the straight line of the straight steel strip that is pulled out from the pull-out port of the wire pull box and does not touch the pull-out port, and the two fixed axes are respectively perpendicular to the straight line. The straight steel strip pulled out from the wire pull box does not touch the pull-out port of the wire pull box, and a section of the straight steel strip pulled out from the wire pull box is respectively perpendicular to the door leaf axis, the hinge axis of the pull box and the upper door frame or the door leaf, and the upright cylindrical rod on the wire pull plate. The hinge axis arranged on the wire pull box is perpendicular to the straight steel strip pulled out from the wire pull box and not in contact with the pull-out port, and the hinge axis arranged on the wire pull box, the cylindrical rod arranged on the wire pull plate and the metal cylinder arranged at the outer end of the steel strip are all on the straight line of the straight steel strip pulled out from the wire pull box and not in contact with the pull-out port.

[0018] Technical analysis of the bending resistance of straight steel strips: The distance from the central axis of the hinged shaft set on the wire draw box to the straight line of the straight steel strip pulled out from the wire draw box outlet and not touching the outlet is used as the length of the lever connecting one end of the straight steel strip to the hinged shaft. The longer the length of the lever between one end of the straight steel strip and the hinge of the wire draw box, the easier it is for the straight steel strip to lose rigidity and bend when the outer end of the pulled straight steel strip is pressed against the hinged shaft of the wire draw box. Therefore, the closer the distance from the hinged shaft set on the wire draw box to the straight line of the straight steel strip pulled out from the wire draw box outlet and not touching the outlet, the better. The standard is that when the outer end of the pulled straight steel strip is pressed against the hinged shaft set on the wire draw box, the straight steel strip cannot lose its instinctive anti-bending rigidity.

[0019] There are four installation methods for positioning draw box door closers: the draw box is hingedly set in a three-panel frame to form the main body of the draw box. The main body of the draw box and the draw plate form a positioning draw box door closer. When the draw box and the draw plate are respectively set on the rear side of the door, the rear side of the upper door frame and the rear side of the door leaf are on a plane perpendicular to the horizontal plane. When the draw plate is installed on the plane in the middle of the upper door frame, the pull-out port on the draw box should be on the same plane and close to or corresponding to the cylindrical rod set on the draw plate. Therefore, when the draw box is installed on the plane in the middle of the upper side of the door leaf, a parallel bracket should be connected and fixed on the plane in the middle of the upper side of the door leaf. The draw box is set on the parallel bracket so that the pull-out port on the draw box and the cylindrical rod set on the draw plate are on the same plane and close to and corresponding to each other. The metal cylinder set at the outer end of the steel strip on the draw box is hinged on the cylindrical rod set on the draw plate. When the door leaf is pushed open, the steel strip pulled out by the draw box is a straight line. When the door leaf rotates, the pulled straight steel strip is pulled out and stretched, and the outer end of the pulled straight steel strip rotates relative to the hinge shaft in the middle of the upper door frame or the middle of the upper side of the door leaf. The draw box connected to the straight steel strip rotates relative to the hinge shaft in the middle of the upper side of the door leaf or the middle of the upper door frame. The pulled straight steel strip is a straight steel strip. The draw box is hinged in the middle of the upper side of the door leaf or the middle of the upper door frame. One end of the straight steel strip is connected to the turntable and the other end is hinged to the hinge shaft on the draw plate installed in the middle of the upper door frame or the middle of the upper side of the door leaf. The straight steel strip is pulled out from the pull-out outlet of the draw box without friction with the pull-out outlet.

[0020] Draw two straight lines parallel to the edges on the surface of a rectangular metal sheet to divide the rectangular metal sheet into three surfaces. The upper surface and the middle surface are folded at right angles with the connecting edge between the two surfaces as the bending edge, and the lower surface and the middle surface are folded at right angles with the connecting edge between the two surfaces as the bending edge. The upper and lower surfaces are on one side of the middle surface, and the three surfaces form a three-panel frame. Two discs with a certain thickness are respectively provided with a circular groove in the middle of one side of each disc, and the two circular grooves provided on the two discs are respectively sleeved on the two ends of the hinge shaft provided on the wire drawing box. The wire drawing box is placed in the three-panel frame, and the outer side surfaces of the two discs connected to the two ends of the hinge shaft provided on the wire drawing box are respectively connected (adhesive connection) to the inner side surface of the upper plate and the inner side surface of the lower plate of the three-panel frame. The upper end and the lower end of the hinge shaft provided on the wire drawing box are respectively hinged to the inner side surface of the upper plate and the inner side surface of the lower plate of the three-panel frame. The draw box is hingedly arranged in the three-panel frame. When the draw box rotates 90 degrees to one side of the hinge axis, the edge of the draw box will not touch the middle plate of the three-panel frame. The hinge axis on the draw box is perpendicular to the upper plate and the lower plate of the three-sided frame. A metal rod is perpendicular to a metal plate and one end of the metal rod is connected and fixed (welded) to a side surface of the metal plate to form a vertical rod draw plate. A metal rod is bent into two right-angled metal rods, one end of a metal rod on the right-angle metal rod is connected (welded) to a side surface of a metal plate, and the two metal rods on the right-angle metal rod connected to the metal plate are respectively perpendicular and parallel to the surface of the metal plate to form a parallel rod draw plate. The parallel rod draw plate is divided into a parallel long rod draw plate and a parallel short rod draw plate. The main plate of the wire pulling box and the wire pulling plate are installed on the door leaf and the upper door frame respectively. The pulling outlet of the wire pulling box on the main plate of the wire pulling box corresponds to the wire pulling plate and when they are in the same horizontal plane, the wire pulling plate is a parallel short rod pulling plate, and a section of metal rod on the parallel short rod pulling plate that is parallel to the metal plate corresponds to the plane of the metal plate. The main plate of the wire pulling box and the wire pulling plate are installed on the door leaf and the upper door frame respectively. The pulling outlet of the wire pulling box on the main plate of the wire pulling box does not correspond to the wire pulling plate and the two are installed at different heights. The wire pulling plate is a parallel long rod pulling plate, and the outer end of a section of metal rod on the parallel long rod pulling plate that is parallel to the metal plate extends out of the corresponding metal plate plane.

[0021] One installation method: When the door leaf is closed, the outer side surface of the middle plate of the three-panel frame is connected (fixed with screws or glue) to the middle of the upper side of the front side of the door leaf, and the back side of the vertical rod pull plate is connected (fixed with screws or glue) to the middle of the downward side of the upper door frame in front of the door. The pull-out port of the hinged pull box on the three-panel frame corresponds to and is close to the cylindrical rod on the vertical rod pull plate. The metal cylinder at the outer end of the steel sheet strip on the pull box is hinged on the cylindrical rod on the vertical rod pull plate, and the outer end of the cylindrical rod is connected and fixed with a plastic limit ring. One installation method: when the door leaf is closed, the outer side surface of the upper plate of the three-panel frame is connected (fixed by screws or glue) and fixed to the middle of the downward surface of the upper door frame in front of the door, or the hinge axis set on the wire draw box is an iron nail, which is set vertically (fixed on the door frame by screws through holes) in the middle of the downward surface of the upper door frame in front of the door so that the wire draw box hinged with the iron nail is hingedly set in the middle of the downward surface of the upper door frame in front of the door. The back side of the parallel short rod pull plate is connected (fixed by screws or glue) and fixed to the middle of the upper side of the front side of the door leaf, the pull-out port of the wire draw box corresponds to and is close to a section of the vertical cylindrical rod on the parallel short rod pull plate, and the metal cylinder at the outer end of the steel strip on the wire draw box is hinged on the cylindrical rod on the parallel short rod pull plate. Three installation methods: when the door leaf is closed, the rear side of the door and the rear side of the upper door frame are both vertical planes and the door leaf is below the upper door frame. The pull box and the pull plate should be installed on the rear side of the door, and the pull-out port of the pull box should correspond to the cylindrical rod on the pull plate. The back side of the parallel short rod pull plate is connected (fixed with screws or glue) and fixed on the plane in the middle of the upper door frame on the rear side of the door. When the pull box is set on the door leaf, a right-angle metal plate (the right-angle metal plate is a parallel bracket) should be installed. One plane of the right-angle metal plate is connected and fixed to the plane in the middle of the upper side of the rear side of the door leaf, and the upper plane of the right-angle metal plate is horizontal. One end of the hinge shaft set on the pull box is welded on the upper plane of the right-angle metal plate and the hinge shaft is perpendicular to its upper plane. The cylindrical barrel mouth on the pull box is sleeved on the hinge shaft. Alternatively, the outer side surface of the lower plate of the three-panel frame is connected (fixed with screws or glue) and fixed on the upper plane of the right-angle metal plate, and the pull box is hingedly set in the three-panel frame. The pull-out port of the wire-pull box corresponds to and is close to a section of upright cylindrical rod on the parallel short-rod pull plate, and the metal cylinder at the outer end of the steel strip on the wire-pull box is hinged on the cylindrical rod on the parallel short-rod pull plate. Four installation methods: When the door leaf is closed, the outer side surface of the middle plate of the three-panel frame is connected (fixed by screws or glue) to the plane in the middle of the upper door frame on the rear side of the leaf door, and the back of the parallel long-rod pull plate is connected (fixed by screws or glue) to the plane in the middle of the upper side of the rear side of the door leaf. The pull-out port of the wire-pull box hinged in the three-panel frame corresponds to and is close to a section of upright cylindrical rod on the parallel long-rod pull plate, and the metal cylinder at the outer end of the steel strip on the wire-pull box is hinged on the cylindrical rod on the parallel long-rod pull plate.

[0022] Beneficial effect: When the existing pull-wire box door closer is installed on the door and used, the pull-wire box is installed and fixed in the middle of the upper side of the door leaf or the middle of the upper door frame, the pull-wire plate is installed and fixed in the middle of the corresponding upper door frame or the middle of the upper side of the door leaf, and the outer end of the pull wire on the pull-wire box is connected to the pull-wire box. When the door leaf is pushed open, the door leaf rotates around the door leaf axis, and the straight pull wire pulled out of the pull-wire box rotates around the pull-out port of the pull-wire box, and the pull wire will rub against the pull-out port of the pull-wire box. The positioning pull-wire box door closer consists of two parts: a pull-wire box and a pull-wire plate. The hinge shaft arranged on the pull-wire box is arranged in the middle of the upper side of the door leaf or the middle of the upper door frame, the pull-wire plate is installed and fixed in the middle of the corresponding upper door frame or the middle of the upper side of the door leaf, and the outer end of the pull wire on the pull-wire box is connected to the pull-wire box. The hinge axis on the wire draw box and the door leaf axis are respectively perpendicular to the straight steel strip pulled out from the wire draw box, and the central axis of the hinge axis on the wire draw box is on the straight line of the straight steel strip pulled out from the spring box and not in contact with the pull-out port. When the door leaf is pushed open, the door leaf rotates around the door leaf axis, and the outer end of the straight steel strip pulled out from the wire draw box is hinged on the cylindrical rod on the wire draw plate. The wire draw box connected with the straight steel strip is hinged in the middle of the upper side of the door leaf or the middle of the upper door frame, and the wire draw box rotates around the hinge axis at the hinge. The straight steel strip pulled out from the wire draw box does not rub against the pull-out port of the wire draw box.

[0023] The existing draw box door closer (clockwork door closer) is installed on the door. The draw wire in the draw box is a soft thin wire, which is used to pull the pushed door leaf back and close it. After the door leaf is pushed open, the reaction force of the coil spring in the draw box causes the pulled thin wire to retract into the draw box, and at the same time, the pulled thin wire drives the door leaf to close. The draw wire in the draw box is a soft thin wire, which is used to pull the pushed door leaf back and close it. In order to position the pushed door leaf and keep it at the positioning position, the soft draw wire is creatively used as a support rod that can be curled and retracted into the draw box and pulled out to be a straight steel strip with anti-bending rigidity, connected between the door leaf and the upper door frame to keep the pushed door leaf at the positioning position. The draw wire set in the draw box is a steel strip with a concave surface on one side and a convex surface on the other side. The steel strip curls on the turntable wheel in the draw box and occupies a small space. After the steel strip is pulled out, it is a straight steel strip with anti-bending rigidity. The two ends of the straight steel strip are hinged between the middle of the upper side of the door leaf and the middle of the upper door frame. When the door leaf is pushed open and rotated, the two ends of the straight steel strip remain unbent (because when one end of the straight steel strip is bent, the pressure at both ends of the straight steel strip will cause it to lose its anti-bending rigidity.) After the door leaf is opened and pushed to the door leaf positioning position, the turntable wheel on the spring barrel is stuck and reversed or the steel strip is stuck and retracted. When the straight steel strip pulled out of the pull box is pressed from both ends, the pulled straight steel strip has anti-bending rigidity. When the compressive force is not large, such as: the door leaf will automatically rotate in the closing direction due to a slight wind or a slight shift in the center of gravity of the door leaf, the straight steel strip pulled out of the pull box can be used as a support rod set between the door leaf and the door frame to keep the door leaf in its original state.

[0024] The door leaf is pushed open and positioned. An automatic door closer is installed on the door, such as a draw box door closer (spring door closer). After the door leaf is pushed open, the reaction force of the coil spring in the draw box will pull the draw wire back to make the door leaf automatically close again, and there is no function of pushing the door leaf open and repositioning. Or, the door leaf is not installed with a door closer. After the door leaf is pushed open, the door leaf will automatically rotate in the closing direction due to a slight wind or a slight shift in the center of gravity of the door leaf. The positioning draw box door closer solves the shortcomings of the existing spring door closer installed on the door and cannot be positioned after the door leaf is pushed open. The use environment is: when the door leaf is positioned after being pushed open, the door leaf remains positioned and does not move under a slight force under normal circumstances. For example, after the door leaf is pushed open, the door leaf will automatically rotate in the closing direction due to a slight wind or a slight shift in the center of gravity of the door leaf. Or, the draw box door closer is installed on the door. After the door leaf is pushed open, the reaction force of the coil spring in the draw box will pull the draw wire back to make the door leaf automatically close, and there is no function of pushing the door leaf open and repositioning.

[0025] Technical solution for the stop and retraction of steel strips: The stop and retraction components of the positioning cable box door closer include a ratchet set on the cable box, a steel strip set in the cable box, and a stop area set on the steel strip. Alternatively, a stop track is set on the side of the turntable wheel, and a swing rod is set in the cable box to form a turntable wheel stop component. When the door leaf is pushed open, the thrust is not large, and the door leaf can be positioned by a positioning prompt sound when the door leaf is opened to the positioning position. Pushing the door leaf again will close it, and the force of pushing the door leaf is light.

[0026] A steel strip retraction stop zone is provided on the surface of the set length of the steel strip, and a ratchet is hinged in the wire draw box, and the ratchet is pressed down and attached to the surface of the steel strip. When the steel strip on the wire draw box is pulled out to the set length, the ratchet slides into the stop zone provided on the steel strip. At this time, when the external force pulling the steel strip is withdrawn, the reaction force of the coil spring on the wheel wheel causes the steel strip to retract, and the vertical surface of the stop bar provided in the stop zone on the steel strip presses against the front end of the ratchet to block the steel strip from retracting. When the pulled steel strip needs to be retracted into the wire draw box, the steel strip is pulled again, and the ratchet slides out of the stop zone on the steel strip. At this time, the external force pulling the steel strip is withdrawn, and the ratchet slides to the stop zone again and slides over the edge of the vertical surface of the oblique blocking bar at the edge of the stop zone, deviates to one side of the ratchet, and then slides over the stop zone. The rebound force of the compression spring provided at the hinge of the thorn claw restores the deviated ratchet to its original position.

[0027] The stop zone on the steel strip is provided with a plurality of stop strips, which are arranged in sequence on the steel strip in the stop zone. When the front end of the ratchet slides through the stop zone of the steel strip, it will make a "click" sound when it slides through the slope of each stop strip, and the front end of the thorn claw will make a "click, click, click" prompt sound when it slides through multiple stop strips in sequence. When the door leaf is pushed open to the set position, that is, the straight steel strip pulled out of the pull box reaches the set length, at this time, when the front end of the thorn claw slides through multiple stop strips in sequence, a "click, click, click" door leaf positioning prompt sound will be made, and when the external force pushing the door leaf is withdrawn at this time, the steel strip cannot retract and will be stuck instantly. When the door leaf is pushed open to any position in the stop zone and the door leaf is not pushed again, the door leaf will be immediately positioned and immobile. Prevent the inertial collision of the movement distance between the ratchet and the stop strip on the stop strip from affecting the quality of the components. For example: like the fire door closer, the door leaf is positioned when it is opened at 90 degrees. People cannot position the door leaf when it is pushed less than 90 degrees. People habitually push the door leaf to 100 degrees and stop pushing the door leaf (generally, they stop pushing the door leaf when they can no longer push the door leaf). The door leaf needs to rotate back to 90 degrees to position it. The rotation of the door leaf will have an inertial collision that affects the service life of the components. The straight steel strip connected between the door leaf and the upper door frame has a certain rigidity and is connected between the door leaf and the upper door frame as a support rod to keep the door leaf in the position (the door leaf will not automatically rotate in the closing direction due to natural factors such as slight wind blowing or a slight center of gravity shift of the door leaf). When the door leaf needs to be closed, push the door leaf again lightly, the pawl will no longer be stuck on the steel strip, the reaction force of the coil spring pulls the turntable wheel to reverse, the steel strip retracts into the spring box, and the door leaf closes.

[0028] The steel strip in the wire draw box is wound around the turntable wheel with a concave surface. The outer end of the steel strip pulled out by the wire draw box is provided with a metal cylinder, which is arranged at the convex surface of the outer end of the steel strip. The metal cylinder is not arranged on the straight line of the straight steel strip. When the straight steel strip connected between the door leaf and the door frame is pressed against each other, the concave surface of the pulled straight steel strip is arched outward, and the curve of the steel strip bending from the convex surface is constantly changing, just like when the bow is pulled, there is a certain range of curve deformation like the curve change of the bow. That is: when a section of straight steel strip is pressed against each other from both ends, its bending resistance to the convex surface has a certain tolerance range, and the convex surface bending resistance of the straight steel strip is greater than the concave surface bending resistance. The wire draw box door closer has a simple structure, is easy to install on the door, and has light force to push the door leaf. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In the figure, 1, pull box, 2, steel strip, 3, turntable wheel, 4, swing rod, 5, torsion spring, 6, stop area, 7, stop strip, 8, oblique stop strip, 9, ratchet, 10 convex annular sheet, 11, inner annular groove, 12, outer annular groove, 13, reverse one-way through ramp block, 14, first forward one-way through ramp block, 15, second forward one-way through ramp block, 16, third forward one-way through ramp block, 17, stop groove, 18, forward one-way through port, 19, vertical rod pull plate, 20, parallel long rod pull plate, 21, door leaf, 22, door frame, 23, parallel short rod pull plate, 24, metal cylinder, 25, mounting plate, 26, right-angle metal plate, 27, three-panel frame.

[0030] Figure 1 It is a structural schematic diagram of the motion relationship between the stop area on the steel strip in the wire pull box and the pawl.

[0031] Figure 2 It is a structural schematic diagram of the sliding stop track and the swing rod on the side of the turntable wheel in the pull box.

[0032] Figure 3 It is a schematic diagram of the vertical rod pull plate structure.

[0033] Figure 4 It is a schematic diagram of the parallel short rod pull plate structure.

[0034] Figure 5 It is a schematic diagram of the parallel long rod pull plate structure.

[0035] Figure 6 It is a side view cutaway structural diagram of a positioning pull box door closer installed in front of a door.

[0036] Figure 7 It is a side view cutaway structural diagram of a positioning pull box door closer installed in front of a door.

[0037] Figure 8 It is a side view cutaway structural diagram of a positioning pull box door closer installed behind a door.

[0038] Fig. 9 It is a side view cutaway structural diagram of a positioning pull box door closer installed behind a door.

[0039] Fig.10 It is a schematic diagram of the structure of a three-panel frame.

[0040] Fig.11 It is a structural schematic diagram in which a hinge shaft arranged on a wire draw box is hingedly arranged on a three-panel frame.

[0041] Fig.12 , schematic diagram of the internal structure of the pull box. DETAILED DESCRIPTION

[0042] exist Figure 1In the invention, a torsion spring (5) has two torsion bars, and between the two torsion bars is a long cylindrical spiral spring having the function of a compression spring, that is, two torsion bars are connected at both ends of a compression spring to form a torsion spring (5) having the function of a compression spring. The long cylinder on the long cylindrical spiral spring in the middle of a torsion spring (5) passes through a fixing rod, and a round hole is provided at the rear of a ratchet (9), and the round hole at the rear of the ratchet (9) passes through the fixing rod, and then two limiting plastic rings (the round hole in the middle of the limiting plastic ring is tightened on the fixing rod) are passed through the two ends of the fixing rod and pushed relative to each other so that the ratchet (9) is fixed at the corresponding position of the fixing rod. The two ends of the fixing rod are respectively inserted into a groove connected in the upper shell and a groove in the lower shell, and the outer end of a torsion rod of the torsion spring (5) has a transverse hook, and the transverse hook of the outer end is transversely pressed on the surface of the middle part of the ratchet (9), and the other torsion rod of the torsion spring (5) is pressed on the edge of the housing of the wire pulling box (1), so that the front end of the ratchet (9) is pressed down in an inclined manner on the middle part of the convex surface of the steel strip (2), and the front end of the ratchet (9) faces the direction of pulling out the steel strip (2). Push the front end of the ratchet (9) to swing toward one end of the fixing rod with a finger, and the side surface of the rear end of the ratchet (9) and the side surface of a limiting plastic ring are adapted to form an angle, and at the same time, the long cylindrical spiral spring in the middle part of the torsion spring (5) on the fixing rod is compressed, and when the external force pushing the front end of the ratchet (9) is withdrawn, the rebound force of the compressed spring makes the side surface of the rear end of the ratchet (9) and the side surface of a limiting plastic ring fit each other, and the front end of the ratchet (9) swings to one side and returns to its original position. The ratchet (9) is hingedly mounted on the edge of the housing of the wire pulling box (1) and the hinge axis is parallel to the central axis of the turntable wheel (3). A torsion spring (5) is sleeved on the hinge axis. The middle part of the torsion spring (5) is a long cylindrical spiral spring with a compression spring function. The front end of the ratchet (9) is pushed and swung by hand to restore it to its original position by the long cylindrical spiral spring in the middle part of the torsion spring (5). The front end of the ratchet (9) is tilted and pressed down on the middle part of the convex surface of the steel strip (2). The front end of the ratchet (9) faces the direction of the steel strip (2) being pulled out. The stop bar (7) and the oblique stop bar (8) are both triangular prisms or oblique bars, one side of which is horizontally connected and fixed to the convex surface of the steel strip, one oblique side faces the direction of the steel strip (2) being pulled out, and the other side of which is an upright side faces the direction of the steel strip (2) being retracted. The oblique blocking bar (8) is obliquely blocked on the vertical surface of the stop bar (7) in the direction of retraction of the steel sheet strip (2), and one end of the oblique blocking bar (8) is connected to one end of the stop bar (7). The oblique blocking bar (8) is obliquely arranged on the surface of the steel sheet strip (2) and forms a stop area (6) with the stop bar (7). There are two circular grooves on a slope surface of the stop bar (7), and the bottom of the two circular grooves has a circular hole respectively. There are also two circular holes on the steel sheet strip (2), and the two circular holes on the stop bar (7) are riveted to the two circular holes on the steel sheet strip (2) with rivets, so that the stop bar (7) is riveted to the steel sheet strip (2).The stop bar (7) is arranged on the steel strip (2). The oblique retaining bar (8) is a plastic strip, which is tough and has a certain hardness. The oblique retaining bar (8) has three holes at both ends and in the middle, which are riveted to the three holes arranged on the convex surface of the steel strip (2).

[0043] When the door leaf (21) is pushed open, the steel strip (2) is pulled out to a specified length, and the ratchet (9) arranged in the wire draw box (1) is pressed down on the convex surface of the steel strip (2) and slides over the slope surface of the stop strip (7) arranged on the steel strip (2), and a "click" prompt sound is emitted, and the ratchet (9) slides into the stop area (6) on the surface of the steel strip (2). The stop zone (6) is provided with a plurality of stop bars (7), which are arranged in sequence on the steel strip (2). When the front end of the ratchet (9) slides through the stop zone (6) of the steel strip (2), a "click" sound is emitted when the front end of the ratchet (9) slides through the slope surface of each stop bar (7). When the front end of the ratchet slides through the plurality of stop bars (7) in sequence, a "click, click, click" prompt sound is emitted. When the external force for pushing the door leaf (21) is withdrawn at this time, the steel strip (2) cannot retract and will be stuck instantly. When the door leaf (21) is pushed to any position of the stop zone (6) and is no longer pushed, the door leaf (21) will be immediately positioned and immobilized. This prevents the ratchet (9) and the stop bar (7) from colliding due to inertia and affecting the service life of the components. For example, in a fire door closer, when the door leaf (21) is pushed open to 100 degrees, the door leaf (21) needs to be rotated back to 90 degrees to be positioned. The rotation of the door leaf (21) will cause an inertial impact that affects the service life of the components.

[0044] The external force pulling the steel strip (2) is withdrawn, and the reaction force of the coil spring pulls the turntable wheel (3) to reverse, and at the same time the ratchet (9) presses against the vertical surface of the stop bar (7) to stop the turntable wheel (3) from reversing. The pulled-out straight steel strip (2) has a certain rigidity and is connected as a support rod between the door leaf (21) and the upper door frame (22) to prevent the door leaf (21) from swinging naturally. When the door leaf (21) needs to be closed, the door leaf (21) is pushed open again, and the steel strip (2) continues to be pulled out, and at the same time the ratchet (9) pressing down on the convex surface of the steel strip (2) slides over the slope surface on the inclined stop bar (8) (meaning sliding over the stop area (6)) and continues to slide on the convex surface of the steel strip (2). At this time, the external force of the door leaf (21) is withdrawn, the reaction force of the coil spring pulls the turntable wheel (3) to reverse and the steel strip (2) retracts, the ratchet (9) slides on the steel strip (2) and slides to the edge of the vertical surface of the inclined inclined blocking strip (8) facing the retraction direction, the ratchet (9) slides over the inclined edge of the inclined blocking strip (8) and deviates to one side and then bypasses the stop strip (7) (meaning sliding over the stop area (6)). The rebound force of the long cylindrical spiral spring in the middle of the torsion spring (5) at the hinge of the ratchet (9) causes the ratchet (9) deviated to one side to swing back to its original position. The steel strip (2) retracts inward and the door leaf (21) is closed. The stop strip (7) and the oblique stop strip (8) arranged on the convex surface of the steel strip (2) can be pulled out from the pull-out port, and the oblique stop strip (8) is a plastic strip. The curve of the oblique stop strip (8) fitted on the arc steel strip (2) is different from the curve of the oblique stop strip (8) fitted on the straight steel strip (2). However, it returns to its original shape when it is retracted onto the arc steel strip (2) in the wire drawing box (1).

[0045] exist Figure 2In the invention, a circular sliding area is arranged on one side of the turntable wheel (3), and a sliding control track of a swing rod (4) is arranged on the circular sliding area. The front end of the swing rod (4) and the sliding control track constitute a stop member on the turntable wheel (3). The circular sliding area on the turntable wheel (3) is provided with an outer annular groove (12) and an inner annular groove (11), and a convex annular sheet (10) is arranged between the outer annular groove (12) and the inner annular groove (11). The sloped block has three side surfaces, and the difference from the triangular prism is that the two surfaces at the two ends of the sloped surface are not parallel to each other. The sloped block is a ridge through which the front end of the swing rod (4) slides in one direction. One side surface of the sloped block is arranged on the plane of the circular sliding area, and a sloped side surface on the sloped block allows the front end of the swing rod (4) to slide from the bottom of the sloped side surface to the top and then slide through the sloped block, and an upright side surface on the sloped block blocks the front end of the swing rod (4) from sliding through the sloped block from its upright side surface. A forward one-way passage opening (18) is provided on the convex annular sheet (10) between the outer annular groove (12) and an inner annular groove (11), and a first forward one-way passage ramp block (14) is provided at the connection between the forward one-way passage opening (18) and the inner annular groove (11). A side surface of a reverse one-way passage ramp block (13) is provided on the bottom surface of the outer annular groove (12), and the reverse one-way passage ramp block (13) is provided at the forward one-way passage opening (18) to control the front end of the swing rod (4) to slide into the sliding opening.

[0046] The steel strip (2) is pulled out, the turntable wheel (3) rotates forward, and an upright side surface of the reverse one-way passing ramp-shaped block (13) arranged at the outer annular groove (12) prevents the front end of the swing rod (4) from sliding through the outer annular groove (12) when the turntable wheel (3) rotates forward, and an upright side surface of the reverse one-way passing ramp-shaped block (13) controls the front end of the swing rod (4) to slide from its upright side surface into the forward one-way passing port (18), and then slide from the ramp side surface of the first forward one-way passing ramp-shaped block (14) on the forward one-way passing port (18) into the inner annular groove (11). A second forward one-way passing ramp-shaped block (15) is arranged on the inner annular groove (11), and the front end of the swing rod (4) then slides from the ramp side surface of the second forward one-way passing ramp-shaped block (15) to enter the stop zone (6). A stop groove (17) is arranged at the convex annular sheet (10) connected to one end of the vertical side surface on the second forward rotation one-way through ramp-shaped block (15). When the external force pulling the steel strip (2) is withdrawn, the reaction force of the coil spring on the turntable wheel (3) causes the turntable wheel (3) to reverse, and the front end of the swing rod (4) slides on the inner annular groove (11) and slides toward the vertical side surface on the second forward rotation one-way through ramp-shaped block (15) and then slides into the stop groove (17) arranged on the convex annular sheet (10) between the outer annular groove (12) and an inner annular groove (11). The front end of the swing rod (4) is stopped in the stop groove (17), the turntable wheel (3) stops reversing, and the steel strip (2) stops retracting. When it is necessary to retract the pulled-out steel strip (2) into the wire drawing box (1), the steel strip (2) is pulled again, the turntable wheel (3) rotates forward, and the front end of the swing rod (4) slides into the outer annular groove (12) from a slope surface on the sloped block (16) provided on an edge of the stop groove (17), that is, the front end of the swing rod (4) slides out of the stop groove (17) of the stop area (6). At this time, when the external force pulling the steel strip (2) is withdrawn, the reaction force of the coil spring on the turntable wheel (3) causes the turntable wheel (3) to reverse, and the front end of the swing rod (4) slides on the outer annular groove (12), and the front end of the swing rod (4) slides over the slope surface on the reverse one-way ramp block (13) provided on the outer annular groove (12), passes through the reverse one-way ramp block (13) and then continues to slide on the outer annular groove (12) to the original position, and the steel strip (2) retracts into the wire drawing box (1).

[0047] exist Figure 3 , Figure 4 and Figure 5In the invention, the wire drawing plate is divided into a parallel rod drawing plate and a vertical rod drawing plate (19). A metal rod is perpendicular to a metal plate and one end of the metal rod is connected and fixed (welded and fixed) to a side surface of the metal plate to form a vertical rod drawing plate (19). A metal rod is bent into two right-angled metal rods, one end of a metal rod on the right-angle metal rod is connected (welded and fixed) to a side surface of a metal plate, and the two metal rods on the right-angle metal rod connected to the metal plate are respectively perpendicular and parallel to the surface of the metal plate to form a parallel rod drawing plate. The parallel rod drawing plate is divided into a parallel long rod drawing plate (20) and a parallel short rod drawing plate (23). The wire drawing box main body plate and the wire drawing plate are respectively installed on the door leaf (21) and the upper door frame (22). The pulling outlet of the wire drawing box (1) on the wire drawing box main body plate corresponds to the wire drawing plate and when they are in a horizontal plane, the wire drawing plate is a parallel short rod drawing plate (23), and a metal rod on the parallel short rod drawing plate (23) that is parallel to the metal plate corresponds to the plane of the metal plate. The main plate of the wire pulling box and the wire pulling plate are respectively installed on the door leaf (21) and the upper door frame (22). The pulling outlet of the wire pulling box (1) on the main plate of the wire pulling box does not correspond to the wire pulling plate and the two are installed at different heights. The wire pulling plate is a parallel long rod pulling plate (20). The outer end of a section of metal rod on the parallel long rod pulling plate (20) parallel to the metal plate extends out of the corresponding metal plate plane.

[0048] exist Figure 6 The door leaf (21) is closed, the outer side surface of the middle plate of the three-panel frame (27) is connected (fixed by screws or glue) to the middle part of the front side surface of the door leaf (21) near the upper side, and the back side of the vertical rod pull plate (19) is connected (fixed by screws or glue) to the middle part of the downward surface of the upper door frame (22) in front of the door. The pull-out port of the draw box (1) hinged on the three-panel frame (27) corresponds to and is close to the cylindrical rod on the vertical rod pull plate (19), and the metal cylinder (24) at the outer end of the steel sheet strip (2) on the draw box (1) is sleeved on the cylindrical rod on the vertical rod pull plate (19) and hinged, and the outer end of the cylindrical rod on the vertical rod pull plate (19) is sleeved with a plastic limit ring for connection and fixation.

[0049] exist Figure 7In the embodiment, the door leaf (21) is closed, the outer side surface of the upper plate of the three-panel frame (27) is connected (fixed by screws or glue) to the middle part of the downward surface of the upper door frame (22) in front of the door, or the hinge axis provided on the draw box (1) is an iron nail, which is vertically arranged (fixed by screws through holes on the door frame (22)) in the middle part of the downward surface of the upper door frame (22) in front of the door, so that the draw box (1) hinged with the iron nail is hingedly arranged in the middle part of the downward surface of the upper door frame (22) in front of the door. The back side of the parallel short rod pull plate (23) is connected (fixed by screws or adhesive connection) and fixed to the middle part of the front side of the door leaf (21) near the upper edge, and the pull-out port of the pull box (1) corresponds to and is close to a section of an upright cylindrical rod on the parallel short rod pull plate (23), and the metal cylinder (24) at the outer end of the steel sheet strip (2) on the pull box (1) is hinged on the cylindrical rod on the parallel short rod pull plate (23).

[0050] exist Figure 8 In the embodiment, the door leaf (21) is closed, the outer side surface of the middle plate of the three-panel frame (27) is connected (fixed by screws or glue) to the plane in the middle of the upper door frame (22) on the rear side of the leaf door, and the back side of the parallel long rod pull plate (20) is connected (fixed by screws or glue) to the plane in the middle of the upper side of the rear side of the door leaf (21). The pull-out port of the draw box (1) hinged in the three-panel frame (27) corresponds to and is close to a vertical cylindrical rod on the parallel long rod pull plate (20), and the metal cylinder (24) at the outer end of the steel sheet strip (2) on the draw box (1) is hinged on the cylindrical rod on the parallel long rod pull plate (20).

[0051] The positioning pull box (1) door closer consists of a pull box main body plate and a pull plate. The positioning pull box (1) door closer has four installation methods on the door that are conventional. The principles of the four installation methods are the same. The positioning pull box (1) door closer is Figure 8The device is installed on the rear side of the door and is described in detail as follows: the door leaf (21) is pushed open to the positioning position, the door leaf (21) is rotated to open, the steel strip (2) in the draw box (1) is pulled out to a set length, the pulled straight steel strip (2) is rotated at the hinged joint with the draw plate, and the draw box (1) connected to the other end of the pulled straight steel strip (2) is hingedly arranged in the three-panel frame (27) and rotates. When the external force of pushing the door leaf (21) is withdrawn, the stop area (6) provided on the steel strip (2) in the draw box (1) is stopped by the ratchet (9) or the stop groove (17) provided on the side of the rotating disk wheel (3) in the draw box (1) is stopped by the swing rod (4), thereby preventing the pulled straight steel strip (2) from retracting into the draw box (1) due to the reaction force of the coil spring. If the external force is not too large (for example, the door leaf (21) will automatically rotate in the closing direction due to a slight wind or a slight shift in the center of gravity of the door leaf (21), for example, the thrust is 9.8N), when the door leaf (21) is pushed, the outer end of the pulled straight steel strip (2) is pushed toward the end connected to the turntable wheel (3), and the door leaf (21) is pushed open to the positioning position. The straight steel strip (2) between the wire drawing plate and the turntable wheel (3) passes through the drawing outlet of the wire drawing box (1). The drawing outlet of the wire drawing box (1) is close to the back of the straight steel strip (2) at the drawing outlet, so that the end of this straight steel strip (2) set at the drawing outlet has anti-bending rigidity. A section of steel strip (2) curled on the turntable wheel (3) in the wire draw box (1) expands outwardly toward the edge of the shell, and the pull-out port of the wire draw box (1) presses against the back of the straight steel strip (2) at the pull-out port, so that the pulled-out straight steel strip (2) has anti-bending rigidity at one end of the wire draw box (1). The pulled-out section of straight steel strip (2) has anti-bending rigidity and is connected between the door leaf (21) and the door frame (22) as a support rod to prevent the door leaf (21) from rotating in the closing direction due to slight wind or slight shift of the center of gravity. The gap between the edge of the wire draw box (1) shell and the edge around the turntable wheel (3) is not large, and when the outer end of the pulled-out straight steel strip (2) is pushed into the wire draw box (1), the steel strip (2) in the wire draw box (1) is not bent and deformed much, and the length of the pulled-out straight steel strip (2) retracted into the wire draw box (1) is short.

[0052] When the door leaf (21) is closed from the positioning position, the door leaf (21) is pushed again, and the external force pushing the door leaf (21) is withdrawn again, and the ratchet (9) arranged in the wire draw box (1) slides out of the stop area (6) arranged on the steel strip (2) and then slides back to the original position, or the swing rod (4) arranged in the wire draw box (1) slides out of the stop groove (17) arranged on the side of the turntable wheel (3) and then slides back to the original position. The pulled steel strip (2) is retracted into the wire draw box (1), and the door leaf (21) is closed. The positioning wire draw box (1) door closer has a simple structure and is easy to use. After the door leaf (21) is pushed open and positioned, when the door leaf (21) is not greatly affected by the force of the external environment (such as: the force that the door leaf (21) automatically rotates in the closing direction due to slight wind or a slight deviation of the center of gravity of the door leaf (21)), the door leaf (21) remains positioned.

[0053] exist Fig. 9 In the embodiment, the door leaf (21) is closed, the rear side of the door and the rear side of the upper door frame (22) are both vertical planes, and the door leaf (21) is below the upper door frame (22). The pull box (1) and the pull plate should be installed on the rear side of the door, and the pull-out port of the pull box (1) should correspond to the cylindrical rod on the pull plate. The back side of the parallel short rod pull plate (23) is connected (fixed by screws or glue) and fixed on the plane in the middle of the upper door frame (22) on the rear side of the leaf door. When the pull box (1) is set on the door leaf (21), a right-angle metal plate (26) (the right-angle metal plate (26) is a parallel bracket) should be installed. A plane of the right-angled metal plate (26) is connected and fixed to a plane near the middle of the upper side of the rear side of the door leaf (21), the upper plane of the right-angled metal plate (26) is horizontal, one end of the hinge shaft arranged on the wire draw box (1) is welded to the upper plane of the right-angled metal plate (26) and the hinge shaft is perpendicular to its upper plane, and the cylindrical cylinder mouth on the wire draw box (1) is sleeved on the hinge shaft. Alternatively, the outer side surface of the lower plate of the three-panel frame (27) is connected (fixed by screws or adhesive connection) and fixed to the upper plane of the right-angled metal plate (26), and the hinge shaft on the wire draw box (1) is hingedly arranged in the three-panel frame (27). The pull-out port of the wire draw box (1) corresponds to and is close to a section of an upright cylindrical rod on the parallel short rod pull plate (23), and the metal cylinder (24) at the outer end of the steel sheet strip (2) on the wire draw box (1) is sleeved on the cylindrical rod on the parallel short rod pull plate (23) and is hinged.

[0054] exist Fig.10 and Fig.11In the embodiment, two straight lines parallel to the edges are drawn on the surface of a rectangular metal sheet to divide the rectangular metal sheet into three surfaces. The upper surface and the middle surface are folded at right angles with the connecting edge between the two surfaces as the bending edge, and the lower surface and the middle surface are folded at right angles with the connecting edge between the two surfaces as the bending edge. The upper and lower surfaces are on one side of the middle surface, and the three surfaces form a three-panel frame (27). Two discs with a certain thickness are respectively provided with a circular groove in the middle of one side of each disc, and the circular grooves respectively provided on the two discs are respectively sleeved on the two ends of the hinge shaft provided on the wire draw box (1). The wire draw box (1) is placed in the three-panel frame (27), and the outer side surface of a disc respectively connected to the two ends of the hinge shaft provided on the wire draw box (1) is respectively connected (adhesive connection) to the inner side surface of the upper plate and the inner side surface of the lower plate of the three-panel frame (27) for fixing. The upper end and the lower end of the hinge shaft arranged on the wire draw box (1) are respectively hinged to the inner side surface of the upper plate and the inner side surface of the lower plate of the three-panel frame (27). The wire draw box (1) is hingedly arranged in the three-panel frame (27). When the wire draw box (1) is rotated 90 degrees around one side of the hinge shaft at the pull-out outlet, the edge of the wire draw box (1) close to the middle plate of the three-panel frame (27) will not touch the middle plate of the three-panel frame (27). The hinge shaft on the wire draw box (1) is respectively perpendicular to the upper plate and the lower plate of the three-panel frame (27).

[0055] exist Fig.12In the embodiment, the wire pulling box (1) is a square body with an upper plane and a lower plane, and a side surface with surrounding edges. The wire pulling box (1) is composed of an upper shell, a lower shell, a turntable wheel (3), a coil spring, and a steel strip (2). A fixed shaft is arranged in the middle of the inner surface of the bottom of the lower shell of the wire pulling box (1), and a cylinder in the middle of the turntable wheel (3) is sleeved on the fixed shaft. A coil spring is arranged on the turntable wheel (3), and a steel strip (2) is wound on the groove around the turntable wheel (3). The diameter of the groove around the turntable wheel (3) is 60MM, and the steel strip (2) is wound on the groove around the turntable wheel (3) and is wound 5 times, and the length of the steel strip (2) is 9.5 meters. The thickness of the steel strip (2) is 0.2 to 0.3MM, the width of the steel strip (2) is 26MM, and the concave depth of the steel strip (2) is 8MM. The steel strip (2) is thick, wide, has a deep concave surface, and has strong rigidity against bending. The steel strip (2) arranged in the wire draw box (1) has a concave surface on one side and a convex surface on the other side. The straight steel strip (2) pulled out from the wire draw box (1) has rigidity against bending. A metal hook is riveted to the outer end of the steel strip (2), which are two surfaces close to right angles, one of which is riveted to the concave surface of the outer end of the steel strip (2), and the other is arranged on the convex surface of the outer end of the steel strip (2). A metal cylinder (24) is welded on one surface of the convex surface of the outer end of the steel strip (2), and the length of the metal cylinder (24) is the same as the length of the cross section of the steel strip (2). The direction of the hole of the metal cylinder (24) is the same as the axial direction of the door leaf (21). A section of the straight steel strip (2) between the turntable wheel (3) and the pull-out port on the wire draw box (1) is parallel to a section of the plane side surface of the corresponding edge around the shell of the wire draw box (1). A section of the plane side surface of the inner peripheral edge of the shell of the wire drawing box (1) is the edge side surface of a straight line from the turntable wheel (3) to the drawing outlet.

[0056] The bottom of the lower shell of the wire pulling box (1) is connected and fixed with an arc piece around the turntable wheel (3). The arc piece is a rectangular piece rolled into an arc with two ends not connected. The center of the arc at the bottom of the arc piece and the center of the arc at the top of the arc piece are both on the axis of the turntable wheel (3). The bottom of the arc piece is connected and fixed to the bottom of the lower shell by adhesive. The width of the arc piece is equal to the thickness of the turntable wheel (3) or the width of the steel strip (2). The gap between the arc piece and the turntable wheel (3) is small, and the arc piece surrounds the turntable wheel (3) so that the circle of steel strip (2) wrapped around the turntable wheel (3) will not expand too much toward the inner surface of the peripheral edge of the outer shell when the steel strip (2) at the pull-out outlet of the clockwork box is pushed inward. One end of the straight steel strip (2) pulled out from the spring box outlet and connected to the turntable wheel (3) is the tangent point connected to the turntable wheel (3). One end of the arc piece is arranged near the tangent point between the straight steel strip (2) and the turntable wheel (3) at the spring box outlet and above the outlet, and the other end of the arc piece is arranged near the spring box outlet and below the outlet. The arc piece arranged on the edge of the turntable wheel (3) can only be used in the technical solution of the stop groove (17) arranged on the side of the turntable wheel (3) and the swing rod (4) in the wire drawing box (1) being stopped. The technical solution of the stop area (6) arranged on the surface of the steel strip (2) in the wire drawing box (1) and the ratchet (9) on the wire drawing box (1) cannot be used because the arc piece will block the ratchet (9) from pressing down on the surface of the steel strip (2).

Claims

1. A positioning pull box door closer, characterized by: A steel strip (2) is wound around a turntable wheel (3) on a wire pulling box (1) as a wire pulling wire on the wire pulling box (1), and the steel strip (2) pulled out from a pulling outlet of the wire pulling box (1) is a straight steel strip (2). A hinge shaft is arranged on the wire pulling box (1), and the hinge shaft is arranged on a straight line of the straight steel strip (2) that is pulled out from the pulling outlet of the wire pulling box (1) and does not touch the pulling outlet, and the hinge shaft is perpendicular to the straight line; the hinge shaft on the wire pulling box (1) is hingedly arranged A wire drawing plate is arranged on the middle part of the upper side of the door leaf (21) or on the middle part of the upper door frame (22), and the outer end of the steel strip (2) on the wire drawing box (1) is hingedly arranged on the wire drawing plate: the straight steel strip (2) pulled out from the wire drawing box (1) is respectively perpendicular to the axis of the door leaf (21), the hinge axis of the wire drawing box (1) and the upper door frame (22) or the door leaf (21), and the cylindrical rod on the wire drawing plate.

2. A positioning draw box door closer according to claim 1, characterized in that: Two straight lines parallel to the edges are drawn on the surface of a rectangular metal sheet to divide the rectangular metal sheet into three surfaces, the upper surface and the middle surface are folded at right angles with the connecting edge between the two surfaces as the bending edge, the lower surface and the middle surface are folded at right angles with the connecting edge between the two surfaces as the bending edge, the upper and lower surfaces are on one side of the middle surface, and the three surfaces form a three-panel frame (27); the upper end and the lower end of the hinge shaft arranged on the pull box (1) are respectively hinged to the inner side surface of the upper plate and the inner side surface of the lower plate of the three-panel frame (27); a metal rod is perpendicular to a metal plate and one end of the metal rod is connected and fixed to a side surface of the metal plate to form a vertical rod pull plate (19); a metal rod is bent into two sections of metal rods at right angles, one end of a section of the metal rod on the right-angle metal rod is connected and fixed to a side surface of a metal plate, and the two sections of the metal rod on the right-angle metal rod connected to the metal plate are respectively connected to the inner side surface of the metal plate The surfaces are perpendicular and parallel to each other, forming a parallel long rod pull plate (20), and the outer end of a section of metal rod on the parallel long rod pull plate (20) parallel to the metal plate extends out of the corresponding metal plate plane: a metal rod is bent into two sections of metal rods at right angles, one end of a section of metal rod on the right-angle metal rod is connected and fixed to a side surface of a metal plate, and the two sections of metal rods on the right-angle metal rod connected to the metal plate are respectively perpendicular and parallel to the surface of the metal plate, forming a parallel short rod pull plate (23), and the outer end of a section of metal rod on the parallel short rod pull plate (23) parallel to the metal plate extends out of the corresponding metal plate plane, and the section of metal rod on the parallel short rod pull plate (23) parallel to the metal plate corresponds to the metal plate plane; the parallel long rod pull plate (20), the parallel long rod pull plate (20) and the vertical rod pull plate (19) are all wire drawing plates; the outer end of the steel sheet strip (2) on the wire drawing box (1) is provided with a metal cylinder (24).

3. A positioning draw box door closer according to claim 1, characterized in that: One installation method: when the door leaf (21) is closed, the outer side surface of the middle plate of the three-panel frame (27) is connected and fixed to the middle part of the upper side of the front side of the door leaf (21), and the back side of the vertical rod pull plate (19) is connected and fixed to the middle part of the downward surface of the upper door frame (22) in front of the door; the pull-out port of the draw box (1) hinged on the three-panel frame (27) corresponds to and is close to the cylindrical rod on the vertical rod pull plate (19), and the metal cylinder (24) at the outer end of the steel sheet strip (2) on the draw box (1) is sleeved on the cylindrical rod on the vertical rod pull plate (19) for hinged connection, and the outer end of the cylindrical rod is sleeved with a plastic limit ring for connection and fixation; the second installation method: when the door leaf (21) is closed, the outer side surface of the upper plate of the three-panel frame (27) is connected and fixed to the upper door frame (22) in front of the door 2) on the middle of the downward surface, or the hinge axis arranged on the wire draw box (1) is an iron nail, which is arranged vertically on the middle of the downward surface of the upper door frame (22) in front of the door so that the wire draw box (1) hinged with the iron nail is hingedly arranged on the middle of the downward surface of the upper door frame (22) in front of the door: the back of the parallel short rod pull plate (23) is connected and fixed to the middle of the upper side of the front side of the door leaf (21), the pull-out port of the wire draw box (1) corresponds to and is close to a section of the vertical cylindrical rod on the parallel short rod pull plate (23), and the metal cylinder (24) at the outer end of the steel sheet strip (2) on the wire draw box (1) is hinged on the cylindrical rod on the parallel short rod pull plate (23); three types of installation: the door leaf (21) is closed, the parallel short rod pull plate (23) is closed, and the metal cylinder (24) on ... ) is connected and fixed to the plane in the middle of the upper door frame (22) on the rear side of the leaf door; a plane of the right-angle metal plate (26) is connected and fixed to the plane in the middle of the upper side of the rear side of the door leaf (21); the upper plane of the right-angle metal plate (26) is horizontal; one end of the hinge shaft arranged on the wire draw box (1) is welded to the upper plane of the right-angle metal plate (26) and the hinge shaft is perpendicular to its upper plane; the cylindrical mouth of the wire draw box (1) is sleeved on the hinge shaft, or the outer side surface of the lower plate of the three-panel frame (27) is connected and fixed to the upper plane of the right-angle metal plate (26); the wire draw box (1) is hingedly arranged in the three-panel frame (27); the pull-out port of the wire draw box (1) is connected to a vertical cylindrical portion on the parallel short rod pull plate (23); The rods correspond to and are close to each other, and the metal cylinder (24) at the outer end of the steel sheet strip (2) on the pull box (1) is hinged on the cylindrical rod on the parallel short rod pull plate (23); four installation methods: the door leaf (21) is closed, the outer side surface of the middle plate of the three-panel frame (27) is connected and fixed to the plane in the middle of the upper door frame (22) on the rear side of the leaf door, the back side of the parallel long rod pull plate (20) is connected and fixed to the plane in the middle of the upper side of the rear side of the door leaf (21), the pull-out port of the pull box (1) hinged in the three-panel frame (27) corresponds to and is close to a section of upright cylindrical rod on the parallel long rod pull plate (20), and the metal cylinder (24) at the outer end of the steel sheet strip (2) on the pull box (1) is hinged on the cylindrical rod on the parallel long rod pull plate (20).

4. A positioning draw box door closer according to claim 2, characterized in that: The pull box (1) is hingedly arranged on the door in a horizontal shape, that is, the central axis of the turntable wheel (3) on the pull box (1) is parallel to the axis of the door leaf (21); a metal hook is arranged at the outer end of the steel strip (2), which has two right-angled surfaces and one of which is riveted to the concave surface of the outer end of the steel strip (2), and the other is arranged on the convex surface of the outer end of the steel strip (2); the metal hook is arranged on a surface of the convex surface of the outer end of the steel strip (2) and a metal cylinder (24) is welded on it, and the length of the metal cylinder (24) is the same as the length of the cross section of the steel strip (2), and the direction of the hole of the metal cylinder (24) is the same as the direction of the axis of the door leaf (21).

5. A positioning pull box door closer according to claim 1, characterized in that: A cylindrical mouth is provided on the wire pulling box (1), and the two ends of the cylindrical mouth pass through the surface of the upper shell and the surface of the lower shell respectively, or a cylinder is provided on the edge of the wire pulling box (1), and the cylinder has a cylindrical mouth, and a hinge shaft is installed on the cylindrical mouth provided on the wire pulling box (1) as the hinge shaft provided on the wire pulling box (1), or a fixed shaft is vertically provided on the outer surface of the upper shell of the wire pulling box (1), and a fixed shaft is vertically provided on the outer surface of the lower shell of the wire pulling box (1), and the central axes of the two fixed shafts are on a straight line, and the two fixed shafts on a central axis serve as the hinge shaft provided on the wire pulling box (1).

Images