JP2011064050A - Rotary damper unit of door closer and spring unit of door closer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a simple and durability-improved door closer which is provided with a speed control system allowing various doors to be speed controllably quickly closed from a fully opened position to a half-closed position and allowing the various doors to be low speed controllably slowly closed from a position just before an entirely closed position to an entirely closed position. <P>SOLUTION: The door closer 100 where damping oil O is filled between a cylinder 11 and a rotating shaft 14 inside the cylinder 11 includes a two stage speed control system SC consisting of a high speed controllable first speed control mechanism SC1 which allows a door 2 to be quickly closed when the door 2 is closed from the fully opened position I to the half-closed position II, and a low speed controllable second speed control mechanism SC2 which allows the door 2 to be slowly closed when the door 2 is closed from the position just before the entirely closed position to the entirely closed position III. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a door closer equipped with a hinge (hinge) that automatically closes various doors, opening / closing panels and lids while controlling the closing speed thereof, and in particular, various doors, opening / closing panels and lids are fully opened. The present invention relates to a door closer that is simple and improved in durability with a two-speed control mechanism that quickly closes in the middle of closing so that the speed can be adjusted, and closes slowly so that the complete closing can be adjusted at a low speed immediately before the closing.

  Conventionally, many door closers (rotating dampers) equipped with hinges (hinges) that automatically close various doors, opening / closing panels and lids while controlling their closing speed have been provided. For example, when the door or the like is pushed in the closing direction with a hand or the like, the door or the like may collide with the frame at the end of the closing rotation, and the door or the frame may be damaged. For this reason, a viscous liquid is filled in the gap formed between the cylinder and the shaft body, and a valve mechanism is provided in the gap. When the cylinder moves in the opening direction, a large amount of the viscous liquid moves. There is provided a hinge that incorporates a rotating damper structure that allows a relatively easy opening operation while the viscous liquid moves only through the orifice hole when operating in the closing direction to delay the closing operation. In addition, the opening operation is also delayed by incorporating a rotary damper.

  The specific hinge is a hinge that includes a plurality of cylinders that are each provided with a mounting plate and that are arranged in a row, and that is arranged so as to straddle the plurality of cylinders, from one end side thereof. A groove formed at a predetermined depth along the axial direction, and a gap formed on the peripheral wall of the groove along the axial direction by the outer peripheral surface of the shaft body and the inner peripheral surface of the cylindrical body, and the groove portion A shaft body in which orifice holes communicating with the shaft body are formed at a predetermined interval, and an orifice adjusting rod that is disposed so as to be able to advance and retreat in the groove portion of the shaft body and can substantially adjust the number of orifice holes that are open. And a hinge. A spring member is disposed in the cylindrical body, and the door or the like is actively closed. According to this hinge, the orifice adjustment rod can be advanced and retracted to increase or decrease the number of orifice holes formed in the substantially open shaft body. This is because the braking force can be easily adjusted according to the type of preference, door, or the like (see, for example, Patent Document 1).

  Further, another automatic return type hinge includes an inner wing having a cylindrical portion serving as a shaft portion in which an insertion hole is formed, a casing that is non-rotatably inserted into the insertion hole, and a rotation in a predetermined direction with respect to the casing. A rotating shaft having a projecting shaft portion that protrudes outward and has a polygonal outer peripheral surface, an outer frame that is non-rotatably inserted into the insertion hole, and is rotatable to the outer frame And a rotating shaft having a protruding shaft portion that protrudes outward from the outer frame and has a polygonal outer peripheral surface, and generates a restoring force when the rotating shaft rotates in a predetermined direction while being mounted in the outer frame. A spring unit having a spring means for rotating, and when the rotary damper unit and the spring unit are inserted into the insertion hole, the rotary damper unit and the spring unit are elastically moved outwardly by being interposed in the center. And an outer wing having a bearing portion in which a fitting hole having a shape corresponding to the shape of the protruding shaft portion of the rotary damper unit and the protruding shaft portion of the spring unit is formed. An automatic return hinge was used. As a result, both the rotary damper unit and the spring unit are unitized and accommodated in the insertion hole of the cylindrical portion that becomes the shaft portion of the hinge, so that the automatic return type hinge assembly is very simple and can be performed with one touch. In addition, a damper function and a return function can be obtained with one hinge, and it is not necessary to manufacture a plurality of types of hinges in manufacturing, and low cost can be obtained (see, for example, Patent Document 2).

  Furthermore, another hinge mechanism provides a hinge mechanism with improved accuracy of speed control at a low speed, and includes a pair of rotary cams, a pair of slide cams, and a valve body having a spring and an orifice, respectively. A first space portion is formed between the cam surface and the cam surface. The first space portion changes in volume by changing the meshing position of both cam surfaces, and between the cam surface and the cam surface. The second space portion whose volume is changed by changing the meshing position of both cam surfaces is formed. The space portion and the space portion communicate with each other through the center holes of both the slide cams to form an oil chamber in which oil is sealed, and the initial position in the circumferential direction with respect to the cylindrical portion of the rotary cam and the slide cam is defined as the space portion and When one volume of the space portion is in a decreasing state, the other volume is set to be in an increasing state (see, for example, Patent Document 3).

  Japanese Patent No. 3641666   Japanese Patent No. 3475307   JP 2000-161342 A

  According to the hinge disclosed in Japanese Patent No. 3641666, the orifice adjusting rod can be moved forward and backward to increase or decrease the number of orifice holes formed in the shaft body that is substantially open. The braking force can be easily adjusted according to the user's preference and the type of door. However, various doors, open / close panels, and lids can be closed quickly so that the speed can be adjusted from fully open to closed, and the two-speed control cannot be performed so that the full closure can be closed slowly so that it can be adjusted at low speed immediately before complete closure. There is a problem to be improved that a smooth door closing operation from full opening to closing cannot be obtained.

  Further, according to the automatic return type hinge disclosed in Japanese Patent No. 3475307, it is assumed that a damper function and a return function can be obtained with a single hinge, and it is not necessary to manufacture a plurality of types of hinges for manufacturing, thereby reducing costs. However, since there is no speed control function for various types of doors during full closure, during full closure, or during full closure, the door closing operation speed is fixed and cannot be adjusted to a safe closing speed. There is a problem in that it is impossible to avoid danger due to failure to obtain the closing operation and to obtain a door operation with high quality.

  Further, according to the hinge mechanism disclosed in Japanese Patent Laid-Open No. 2000-161342, the newly proposed hinge mechanism composed of a rotary cam and a slide mechanism improves the accuracy of speed control for closing at a low speed when the door is completely closed. Yes. However, various doors, open / close panels, and lids can be closed quickly so that the speed can be adjusted from fully open to closed, and the two-speed control cannot be performed so that the full closure can be closed slowly so that it can be adjusted at low speed immediately before complete closure. There is a problem to be improved that a smooth door closing operation from full opening to closing cannot be obtained.

  The present invention has been made on the basis of the problems of the hinge mechanisms described above, and the object of the present invention is to quickly close various doors so that the speed can be adjusted from fully open to halfway, and from just before complete closure. An object of the present invention is to provide a door closer that is simple and has improved durability by providing a speed control system that allows a complete closing operation to be performed at a low speed so as to be closed slowly.

  In order to achieve the above object, a rotary damper unit for a door closer according to claim 1 of the present invention is a rotary damper unit for a door closer that is filled with a cylindrical body and a rotary shaft body and braking oil therein. A first speed control mechanism that can be adjusted to close quickly during closing, and a second speed control mechanism that can be adjusted to close slowly after closing immediately before complete closure. A two-stage speed control system is provided.

  According to a second aspect of the present invention, there is provided the rotary damper unit of the door closer according to the first aspect of the present invention, wherein the first speed control mechanism and the second speed control mechanism that serve as the two-stage speed control system are: A vane on the outer periphery of the rotating shaft body, passages through which the braking oil in the respective braking oil chambers formed before and after the vane circulates in the rotating shaft body when the rotating shaft body rotates, and doors that are independent of the passages. A check valve for circulating the brake oil during opening operation, a throttle valve for blocking the brake oil and controlling the flow rate of the brake oil during the closing operation of the doors, and throttle valves at both ends of the rotating shaft body And an adjusting shaft.

  According to a third aspect of the present invention, there is provided a spring unit for a door closer that is provided with a cylindrical body, a rotary shaft body and a coil spring for automatic return therein, and forcibly operates doors from fully open to fully closed. In the unit, a plurality of steel balls are interposed in a recess between a pair of thrust disks fitted to the rotating shaft body, and a pressing force acting in the axial direction of the rotating shaft body is generated by a plurality of disc springs. Features.

  According to a fourth aspect of the present invention, there is provided a rotary damper unit for a door closer according to the first or second aspect of the present invention, wherein the spring unit for forcibly closing the doors is a cylindrical body and its internal rotation. It is characterized by interposing between the shaft bodies.

  Thus, the rotary damper unit of the door closer according to claims 1 and 2 of the present invention includes a first speed control mechanism that can be adjusted to perform a quick closing operation when the doors are closed from the fully open state to the closed state, It is equipped with a two-stage speed control system consisting of a second speed control mechanism that allows a slow closing operation so that a low speed adjustment is possible at the time of closing from just before to a complete closure. As a result, various doors, opening / closing panels, and lids can be quickly closed by adjusting the adjustment shaft of each throttle valve to the user's preferred speed from the fully open position to the middle of closing, and from the time immediately before the complete closing to the complete closing the user. In order to perform the slow closing operation according to the preference, the second speed control that allows the closing operation to be performed slowly by adjusting the adjusting shaft of each throttle valve can be performed. Accordingly, the second speed control is smoothly performed in which the closing operation is performed relatively quickly from the fully open state to the middle when the door is closed, and the closing operation is performed slowly from the middle to the complete closing.

  In the spring unit of the door closer according to claim 3 of the present invention, the pressing force acting in the axial direction of the rotating shaft body is generated by the plurality of disc springs, so that the door can be strongly clamped at the fully opened position.

  According to a fourth aspect of the present invention, there is provided a rotary damper unit for a door closer according to the first or second aspect, wherein the spring unit according to the third aspect is interposed between the cylindrical body and the rotary shaft body therein. Because of this, the damper function and automatic return function of the doors work on the rotating shaft in the cylinder that makes up the hinge, and the door closer function can be performed simply by installing a pair of upper and lower hinges of the same type on the door. During the door closing operation, the slow second speed control is smoothly performed because each section from the fully open to the fully closed state is fast.

  According to the rotary damper unit of the door closer of the present invention, various doors, opening / closing panels and lids can be closed relatively quickly from the fully opened state to the middle of closing and the delicate speed can be adjusted. A door closer having a two-speed control mechanism capable of performing a low-speed closing operation and finely adjusting the speed can be provided. In addition, a simple and durable mechanism, space saving, low cost, high backlash removal effect and high quality door closer can be provided.

  Further, according to the spring unit of the door closer of the present invention, the pressing force acting in the axial direction of the rotating shaft body can be generated by the plurality of disc springs, so that the door can be strongly clamped at the fully open position.

  Also, according to the rotary damper unit of the door closer of the present invention, a spring unit for forcibly closing the doors is interposed between the cylindrical body and the rotating shaft body inside the door closer, so that the hinge is configured. The rotating shaft in one cylinder can exert the damper function and return function of doors, and it is not necessary to manufacture and use multiple types of hinges in manufacturing and use, and all the manufacturing processes of door closers Low cost can be obtained in the construction process.

  BRIEF DESCRIPTION OF THE DRAWINGS It is the perspective view which showed the 1st Embodiment of this invention and provided the door closer in the door.   1 is a cross-sectional view of a spring unit according to a first embodiment of the present invention.   1 is a cross-sectional view of a rotary damper unit according to a first embodiment of the present invention.   1 is a cross-sectional view of a cylindrical body of a rotary damper unit according to a first embodiment of the present invention.   1 is a cross-sectional view of a rotating shaft body of a rotary damper unit according to a first embodiment of the present invention.   It is an action line figure showing a 1st embodiment of the present invention and a door closer.   FIG. 2 is a sectional view showing the operation of the two-stage speed control system according to the first embodiment of the present invention.   FIG. 2 is a sectional view showing the operation of the two-stage speed control system according to the first embodiment of the present invention.   FIG. 2 is a sectional view showing the operation of the two-stage speed control system according to the first embodiment of the present invention.   FIG. 2 is a sectional view showing the operation of the two-stage speed control system according to the first embodiment of the present invention.   It is sectional drawing of the door closer which shows the 2nd Embodiment of this invention.   FIG. 6 is a cross-sectional view of a spring unit according to a third embodiment of the present invention.

  The door closer 100 of the present invention is shown conceptually in FIG. 1 (attached to the door 2), and a specific first embodiment is shown in FIGS. First, as shown in FIG. 1, the door closer 100 has a hinge type rotary damper unit 10 and a spring unit 20 attached to the top and bottom of the door 2 in the door 2 installed at the entrance 1 of a house or an office. Is. The door 2 is automatically returned by the spring unit 20 from the fully open position I (105 ° to 120 ° opening) to the fully closed position III (0 ° closed) via the intermediate position II (90 ° to 30 ° closed). Be operated. Also, the rotary damper unit 10 allows the doors to be closed quickly in an adjustable manner when the door is closed from the fully open position I (105 ° to 120 ° opening) to the middle position II (90 ° to 30 ° in the middle of closing). When closing from the position immediately before the fully closed position III (0 ° closing), the closing operation is adjustable and delayed. The arrangement of the rotary damper unit 10 and the spring unit 20 may be reversed upside down.

  First, FIG. 2 shows details of the spring unit 20. Bearing sleeves 22 and 23 are screwed into both ends of the cylindrical body 21, and a rotary shaft body 24 is rotatably supported between the bearing sleeves 22 and 23. Support pieces 25A and 25B of a hinge 25 are connected to both ends 24A and 24B of the rotary shaft body 24 by bolts B. In addition, support pieces 26 </ b> A of a hinge 26 are bonded to both ends of the cylindrical body 21. A coil spring 27 is wound around the space between the cylindrical body 21 and the rotating shaft body 24, one end 27 </ b> A is hooked on a retaining hole 24 </ b> C of the rotating shaft body 24, and the other end 27 </ b> B is on the wall surface of the cylindrical body 21. It is hooked on the screwed bolt B2. As shown in the action diagram shown in FIG. 6, the coil spring 27 has a turning force F that automatically returns the door 2 from the fully open position I (105 ° to 120 ° opening) to the fully closed position III (0 ° closed). Has been granted. Of course, the turning force F is adjusted so as to be appropriately adjusted although not shown. Further, in order to clamp the two hinges 25 and 26 in the fully opened state, a clamp ball 28 is fitted into the wall surface hole 21C of the cylindrical body 21, and the pressing force of the leaf spring 29 attached to the crosspiece 25C of the hinge 25 with the bolt B3. Strongly clamped by F2. Thus, as shown in FIGS. 1 and 6, the door 2 is stopped at the fully open position I (opening at 105 ° to 120 °).

  Subsequently, the rotary damper unit 10 which is the main body of the present invention is configured as shown in FIGS. First, as shown in FIG. 4, the cylindrical body 11 has female screws 11 </ b> A and 11 </ b> B screwed to the inner surfaces of both ends, and the projecting sides 11 </ b> D and 11 </ b> E are disposed at opposed positions over almost the entire length of the inner peripheral surface 11 </ b> C. . Further, a support piece 16 </ b> A of a hinge 16 is bonded to a part of the outer peripheral surface of the cylindrical body 11. As shown in FIG. 3, bearing sleeves 12 and 13 are screwed into both ends of the cylindrical body 11, and the rotary shaft body 14 is interposed between the bearing sleeves 12 and 13 via a needle bearing N and an oil seal OL. And is rotatably supported. The rotating shaft body 14 has through holes 14C and 14D that are long in the axial direction from both ends 14A and 14B. The adjusting shafts B3 and B4 provided with male screws M1 and M2 in the middle are provided with through holes 14C. , 14D are screwed into female screws M3, M4 provided at positions close to both ends 14A, 14B. The outer ends of the adjusting shafts B3 and B4 protrude from both ends 14A and 14B of the rotary shaft body 14, and the support pieces 15A and 15B of the hinge 15 are fitted to the both ends 14A and 14B of the rotary shaft body 14, and the nuts N1 and N2 It is connected with.

  Two-stage speed control is provided in two spaces (braking oil chambers) S1 and S2 between the opposing projecting sides 11D and 11E in the cylindrical body 11 and the vertical position of the rotating shaft body 14 inserted into this space. A first speed control mechanism SC1 and a second speed control mechanism SC2 that constitute the system SC are configured. As shown in FIGS. 3 and 5, the detailed configuration thereof includes vanes 14F and 14G provided at symmetrical positions on the outer periphery of the rotating shaft body 14, and braking in the respective brake oil chambers S1 and S2 formed before and after the vane. When the rotary shaft 14 rotates based on the opening / closing operation of the door 2, oil O flows between the respective brake oil chambers S1, S2 through the two passage holes L1, L2 and L3, L4 provided in the rotary shaft. The circuit is configured so that In the passage hole L2 and the passage hole L3, the brake oil O in the brake oil chambers S1 and S2 is released when the doors 2 are opened, and the brake oil flowing in the opposite direction is closed during the closing operation. A first check valve V1 and a second check valve V2 for stopping the brake oil O in the chambers S1, S2 are incorporated. Further, the passage holes L1 and L4 incorporate a first throttle valve V3 and a second throttle valve V4 for controlling the flow rate of the brake oil O in the brake oil chambers S1 and S2 during the closing operation. The first throttle valve V3 and the second throttle valve V4 are formed such that the tip ends a and b of the adjustment shafts B3 and B4 screwed to both ends of the rotary shaft body 14 are formed in a conical shape, and the adjustment shaft B3 The diaphragm is individually adjusted by the rotation of B4. The first check valve V1 and the second check valve V2 include a passage hole L2 and a passage formed by a coil spring CB in which each spherical body K is pressure-fitted between the tip ends a and b of the adjustment shafts B3 and B4. It is pressure-closed by the recessed seat portion Z of the hole L3.

  Thus, in the first speed control mechanism SC1, the first check valve V1 opens the flow of the braking oil O from the passage hole L2 to the passage hole L1 through the passage L5 when the door 2 is opened. When the door 2 is closed, the brake oil O blocks the flow from the passage hole L1 to the passage hole L2 via the passage L5. The first throttle valve V3 controls the flow rate so that the brake oil O between the brake oil chambers S1 and S2 is slightly throttled regardless of the opening / closing operation of the door 2, and in particular, the door 2 is in the fully open position I ( In the closing section from the 105 ° to 120 ° opening) to the middle position II (90 ° to 30 ° closing middle), the flow rate of the brake oil O can be adjusted to a slightly reduced state so that the closing operation can be performed quickly. ing.

  In the second speed control mechanism SC2, the second check valve V2 is configured such that when the door 2 is opened, the brake oil O opens the flow from the passage hole L3 to the passage hole L4 through the passage L6. In the closing operation of No. 2, the braking oil O blocks the flow from the passage hole L4 to the passage hole L3 via the passage L6. The second throttle valve V4 controls the flow rate so that the flow amount of the brake oil O between the brake oil chambers S1 and S2 is greatly reduced regardless of the opening / closing operation of the door 2, and in particular, the intermediate position II (90 The circuit configuration is such that the closing operation can be performed slowly in an adjustable manner during the closing period from (° to 30 ° closing) to the fully closed position III (0 ° closing).

  The rotary damper unit 20 in the door closer 100 of the first embodiment is configured as described above, and acts as shown in FIGS. First, when the door 2 is opened from the closed state to the fully opened state, the hinge type rotary damper unit 10 and the spring unit 20 are attached to the top and bottom of the door 2, so the door 2 is fully opened from the fully closed position (III). The opening to the position (I) is forcibly operated by the user by overcoming the turning force F of the spring unit 20. During the opening operation of the door 2, the first check valve V1 and the second check valve V2 allow the brake oil O to pass through the passage L5 (L6) from the passage hole L2 (L3) of one brake oil chamber S2. The flow to the other braking oil chamber S1 is improved through the other passage hole L1 (L4), and the braking force is released. In order to hold the door 2 in the fully open position I, a clamp ball 28 provided in the spring unit 20 is fitted into the wall surface hole 21C of the cylindrical body 21 and is strongly clamped by the pressing force F2 of the leaf spring 29.

  Subsequently, the closing operation of the door 2 from the fully open position I (105 ° to 120 ° opening) to the fully closed position III (0 ° closing) is performed in the following procedure. First, the closing operation for automatically returning the door 2 from the fully open position (I) to the fully closed position (III) is performed by the user forcibly closing the door 2 clamped at the fully open position (I). To do. Here, as shown in FIG. 6, when the door 2 is slightly swung from 105 °, which is fully open (I), to 90 °, the clamp ball 28 is disengaged from the wall surface hole 21 </ b> C of the cylindrical body 21, and With the turning force F, the automatic return starts toward the fully closed position (III).

  At the time of automatic return to the fully closed position (III) due to the turning force F of the spring unit 20, the door 2 becomes 90 ° from the fully open position I (105 ° to 120 ° opening), and the intermediate position II (90 ° to As shown in FIGS. 6, 7 and 8, the braking oil O flows through the first throttle valve V3 of the first speed control mechanism SC1 and adjusts to the optimum speed in the closing section to the middle of 30 ° closing). The first speed control is performed in the closed state. That is, in the first speed control mechanism SC1, when the door 2 is closed, the first check valve V1 blocks the flow of the brake oil O from the passage hole L1 to the passage hole L2 via the passage L5. . The first throttle valve V3 has a flow rate from each brake oil chamber S1 to S1 ′ and from S2 to S2 ′ so that the brake oil O between the brake oil chambers S1 and S2 is slightly throttled regardless of the opening / closing operation of the door 2. Control. Thereby, the door 2 is closed by the safe first speed control that is relatively fast but feels light.

  The subsequent closing operation from the middle position II (90 ° to 30 ° middle closing) to the fully closed position III (0 ° closing) is performed by the first speed control mechanism SC2 as shown in FIGS. The closing operation is performed by the second speed control in a state where the braking oil O flows through the second throttle valve V4 and is adjusted to an optimum speed. That is, in the second speed control mechanism SC2, when the door 2 is closed, the second check valve V2 blocks the flow of the brake oil O from the passage hole L4 to the passage hole L3 through the passage L6. . The second throttle valve V4 controls the flow rate from each brake oil chamber S1 to S1 ′ and from S2 to S2 ′ so that the brake oil O between the brake oil chambers S1 and S2 is greatly throttled regardless of the opening / closing operation of the door 2. To do. As a result, the door 2 is closed at a very slow but light and safe second speed control to reach the fully closed position III (0 ° closed), and the vanes 14F and 14G of the rotary shaft body 14 are moved into the cylindrical body 11. It abuts against the opposite projecting sides 11D and 11E and stops gently.

  Like the door 2, the closing action from the fully open position I to the fully closed position III is applied to various doors, opening / closing panels, and lids. Then, the closing speed at which the door 2 automatically returns is quickly closed by adjusting the adjusting shafts B3 and B4 of the throttle valves V3 and V4 in the first speed control preferred by the user from the fully open state to the middle of closing. Further, from the time immediately before the complete blockage to the complete blockage, the second speed control can be performed in which the closing operation is slowly performed by adjusting the adjustment shafts of the throttle valves V3 and V4 at a low speed desired by the user. Thus, the second speed control from fully open to closed when the door is closed is smoothly performed.

  According to the door closer 100 according to the first embodiment of the present invention, the following effects can be obtained. First, according to the door closer of the present invention, various doors, opening / closing panels and lids can be closed relatively quickly from the fully opened state to the middle of closing and delicate speed adjustment is possible, and the speed is slow from immediately before the complete closing to the complete closing. It is possible to provide a door closer having a two-speed control mechanism capable of closing operation and finely adjusting the speed. In addition, a simple and durable mechanism, space saving, low cost, high backlash removal effect and high quality door closer can be provided.

  The present invention is not limited to the first embodiment described above, and design changes can be made within the scope of the invention. As shown in FIG. 11, the door closer 200 according to the second embodiment of the present invention includes a rotary damper unit (damper function) between the cylindrical body 11 and the rotary shaft body 14 in the cylindrical body 11. ) And a rotary damper unit (damper function) 30 in which a spring unit (return function) 20 is housed. Other configurations are the same as those of the door closer 100 according to the first embodiment, and are denoted by the same reference numerals and description thereof is omitted.

  According to this configuration, a single door closer 200 includes a spring unit (return function) 20 for forcibly closing the doors and a rotary damper unit (damper function) 10 for the door damper function. Since it is interposed between the internal rotating shaft bodies 14, the damper function and the automatic return function of the doors work on the rotating shaft 14 in one cylindrical body constituting the hinge, and the same type of paired upper and lower hinges are installed on the door. The function of the door closer can be fulfilled, and the second speed control from the fully open to the closed state when the door is closed is smoothly performed.

  According to the door closer 200 according to the second embodiment of the present invention, the following effects can be obtained. Since the spring unit 20 for forcibly closing the doors is interposed between the cylinder 11 and the rotary shaft 14 inside the door closer 200, the rotary shaft in the single cylinder constituting the hinge A damper function and a return function of the doors are obtained, and it is not necessary to manufacture and use a plurality of types of hinges in manufacturing and use, and low cost can be obtained in all manufacturing processes and construction processes of the door closer.

  A door closer 300 according to a third embodiment of the present invention is shown in FIG. 12, and the spring unit (returning function) 40 is modified in design. In the spring unit (returning function) 20, the pressing force F2 against the clamp ball 28 is applied by the leaf spring 29, but a plurality of (for example, recesses 41A, 42A between the pair of thrust discs 41, 42 (for example, Four steel balls 43 to 46 are interposed, and a pressing force (for example, 300 kg) F3 acting in the axial direction is strongly generated by a plurality of disc springs 47. Other configurations are the same as those of the spring unit (return function) 20 of the first embodiment, and the same reference numerals are given and the description thereof is omitted.

  Thus, according to the spring unit (return function) 40, in order to hold the door 2 in the fully open position I, a plurality of (for example, four) steel balls 43 to 46 provided in the spring unit 40 are formed into a pair of thrust disks 41, A pressing force (for example, 300 kg) F3 is applied in the axial direction by the plurality of disc springs 47 and fits into the recesses 41A, 42A between the two, and the door 2 is clamped more strongly. Thereby, erroneous operation due to wind or weak external force is eliminated, and the door 2 can be more reliably held at the fully open position I.

  Furthermore, it is not limited to each embodiment of the door closer 100, 200, 300 of the present invention. For example, it is possible to change the type and arrangement of the throttle valves V3 and V4 and the check valves V1 and V2, which are detailed design changes. Other structural details can be changed within the scope of the invention.

  The door closer 100, 200, 300 of the present invention has been described with respect to the embodiment installed at the entrance 1 of a house or office. However, the present invention is not limited to this, and various doors, opening / closing panels, various lids, and even hinges (hinges) that pivot on doors and lids of ordinary industrial machines and general machines can be installed. It can also be applied to a wide range of door closers that automatically close the doors and lids.

DESCRIPTION OF SYMBOLS 1 Entrance / exit 2 Door 10 Rotation damper unit 11 Cylindrical body 11A, 11B Female thread 11C Inner peripheral surface 11D, 11E Protrusion side 12, 13 Bearing sleeve 14 Rotating shaft body 14A, 14B Both ends 14C, 14D Through-hole 14F, 14G Vane 15 Hinge 15A , 15B Support piece 20 Spring unit 21 Tubular body 21C Wall hole 22, 23 Bearing sleeve 24 Rotating shaft 24A, 24B Both ends 24C Stop hole 25 Hinge 25A, 25B Support piece 25C Crosspiece 26 Hinge 26A Support piece 27 Coil spring 27B Other end 28 Clamp Ball 29 Leaf spring 30 Rotary damper unit 40 Spring unit (return function)
41, 42 Thrust discs 41A, 42A Indentations 43-46 Steel balls 47 Plural disc springs 100-300 Deark Rosa I Fully open position II Intermediate position III Fully closed position B0 Coil spring B3 Adjusting bolts B3, B4 Adjusting shafts B5, B6 Nut F Turning force F2, F3 Pressing force G Concave seat KO Ball N Needle bearing M1, M2 Male thread M3, M4 Female thread OL Oil seal O Braking oil SC Two-stage speed control system SC1 First speed control mechanism SC2 Second speed control Mechanisms S1, S2 Braking oil chambers S1 ', S2' Braking oil chambers L1-L6 Passage hole V1 First check valve V2 Second check valve V3 First throttle valve V4 Second throttle valve

Claims (4)

  In a rotary damper unit of a door closer that is filled with a cylindrical body and a rotating shaft body and braking oil therein, a first speed control mechanism that can be adjusted so as to be quickly closed when the doors are closed from fully open to closed, A rotary damper unit for a door closer, comprising a two-stage speed control system comprising a second speed control mechanism that can be adjusted so as to perform a slow speed closing operation at the time of closing from a position immediately before a complete closure to a complete closure.   The first speed control mechanism and the second speed control mechanism, which are the above-described two-stage speed control system, rotate vanes on the outer periphery of the rotating shaft body and braking oil in the respective braking oil chambers formed before and after the vane. Occasionally, the passages that circulate in the rotating shaft body, the check valves that are made independent of the passages to flow the brake oil when the doors are opened, and the check valves shut off the brake oil when the doors are closed. The rotary damper unit for a door closer according to claim 1, further comprising a throttle valve for controlling a flow rate of braking oil, and an adjustment shaft for each throttle valve at both ends of the rotary shaft body.   In a spring unit of a door closer that is equipped with a cylindrical body and a rotating shaft body and a coil spring for automatic return inside, and forcibly operates doors from fully open to fully closed, between a pair of thrust disks fitted on the rotating shaft body A spring unit for a door closer characterized in that a plurality of steel balls are interposed in a recess of the shaft and a pressing force acting in the axial direction of the rotating shaft is generated by a plurality of disc springs.   The rotary damper unit of the door closer according to claim 1 or 2, characterized in that the spring unit according to claim 3 for forcibly closing the doors is interposed between the cylindrical body and the internal rotating shaft body. Rotating damper unit for door closer.

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