JP5393756B2 - Door closer - Google Patents

Description

  The present invention relates to an improvement in a door closer (door self-closing device) that automatically and slowly closes an open door, and particularly relates to a fire suppression measure.

  Generally, the door closer includes a housing having a sealed space filled with hydraulic oil, and a piston urged by a coil spring is disposed in the sealed space of the housing so as to be capable of reciprocating. Further, a rack and pinion mechanism is assembled to the piston, and a rotating shaft is coupled to the pinion of the rack and pinion mechanism so as to rotate integrally therewith so as to penetrate the housing vertically. Further, one end of the link mechanism is connected to the upper end of the rotating shaft, and the other end of the link mechanism is connected to the upper frame side of the door opening of the building.

  When the door is opened, the rotational operation is transmitted to the rotary shaft through the link mechanism, and further converted into a linear motion of the piston through the rack and pinion mechanism. Thus, when the piston moves in the sealed space of the housing to compress the coil spring, and the hand is released from the door, the door is slowly and automatically closed by the repulsive force of the compressed coil spring. Yes. The closing speed of the door is adjusted by controlling the flow rate of the hydraulic fluid that flows in conjunction with the movement of the piston with a speed adjusting valve.

  By the way, as this kind of door closer, Patent Document 1 discloses that the housing is covered with a cover member to cut off heat conduction, thereby suppressing the change in the viscosity of the hydraulic oil filled in the housing (sealed space). A door closer that stabilizes the closing speed is disclosed.

Japanese Patent Laid-Open No. 2006-348652

  However, in the above-mentioned Patent Document 1, the cover member is formed in a box shape with the upper wall, the lower wall, the front wall, and the both side walls, and covers the housing from the indoor side and is in close contact with the housing and the door. The top wall and the bottom wall are formed with notches for avoiding interference with the rotation shaft, and the rotation shaft protrudes downward from the notches on the bottom wall. If the temperature becomes too high, the internal pressure of the hydraulic oil inside the housing increases, and there is a risk that the hydraulic oil will overflow from the part joint location, the rotating shaft and the like. Then, if the overflowing hydraulic oil adheres to the hot door through the cutout portion of the lower surface wall, there is a risk of ignition in some cases. In addition, the speed adjustment valve may be made of resin, and the resin speed adjustment valve melts due to heat, and the hydraulic oil blown out from the location also adheres to the door through the notch portion of the lower surface wall. There is also a risk of ignition.

  The present invention has been made in view of this point, and an object of the present invention is to suppress ignition due to the fact that the hydraulic oil inside the housing adheres to the door that has become hot.

  The present invention has been made to solve the above-described problems, and includes a housing 4 having a sealed space 4a filled with hydraulic oil, and reciprocating movement in a state where the piston 4 is urged by the piston urging means 16 in the sealed space 4a. The piston 15 arranged in a possible manner, the rack and pinion mechanism 21 incorporated in the piston 15, and the pinion 23 of the rack and pinion mechanism 21 are integrally connected to the housing 4 so as to penetrate the housing 4 up and down. The rotary shaft 24, a link mechanism 29 having one end connected to the upper end 24a of the rotary shaft 24 and the other end connected to the upper frame 102 side of the door opening 101 of the building, and the side wall 10 of the housing 4 The speed adjusting valve 37 that adjusts the closing speed of the door 104 by controlling the flow rate of the hydraulic fluid that flows through the sealed space 4 a in conjunction with the movement of the piston 15. And by rotating the door 104, the rotational movement thereof is converted into the linear movement of the piston 15 via the link mechanism 29, the rotary shaft 24, and the rack and pinion mechanism 21 to convert the pinton 15 into the piston urging means 16. The piston 15 is moved in the sealed space 4 a of the housing 4 by the biasing force of the piston biasing means 16 by moving the piston 15 in the sealed space 4 a of the housing 4 against the biasing force of the housing 4 and releasing the hand from the door 104. The door closer 1 is configured to close the door 104 slowly and automatically, and the rotary shaft 24 discharges the hydraulic oil from the sealed space 4a when the housing 4 reaches a high temperature. 24A, 24B, 24C, 24D, and the hydraulic oil discharge passages 24A, 24B, 24C, 24D are closed by resin members 38, 39. The features.

  Here, a cup 28 that covers the lower end 24b of the rotary shaft 24 is provided, and the hydraulic oil discharged from the hydraulic oil discharge passages 24A, 24B, 24C, and 24D passes through a discharge hole 28A formed in the cup 28. It is preferable to be discharged to the outside.

  Further, it is preferable to include positioning means 9B, 28C and 28D for positioning the discharge hole 28A on the front side of the door closer 1.

  The discharge hole 28A is preferably formed to be inclined with respect to the axis of the rotary shaft 24.

  According to the door closer of the present invention, when the temperature of the door becomes high due to some factor, the resin member that closes the hydraulic oil discharge passage formed in the rotating shaft is melted and the hydraulic oil is discharged from the inside of the housing (sealed space). Therefore, it is possible to suppress ignition due to the hydraulic oil inside the housing adhering to the heated door.

It is a top view of the state where the door closer concerning an embodiment was attached to a door. It is a front view in the AA line of FIG. It is a side view in the BB line of FIG. It is a cross-sectional top view which shows the internal structure of the door closer main body in the door closer which concerns on embodiment. It is sectional drawing in the CC line of FIG. It is a side view in the DD line of FIG. FIG. 6 is a view corresponding to FIG. 5 showing a modification. FIG. 6 is a view corresponding to FIG. 5 showing a modification. FIG. 6 is a view corresponding to FIG. 5 showing a modification.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1-3, 101 shows the door opening part of a building, and this door opening part 101 is the space enclosed by the rectangle by the upper frame 102, a pair of right and left eaves frame 103, and a lower frame (not shown). The door 104 is attached to the one frame 103 via a hinge 105 so that the door opening 101 can be opened and closed. The door 104 is automatically and slowly closed from the open state by the door closer 1.

  The door closer 1 is a left-open (left-handed) parallel type and includes a door closer body 2. The door closer body 2 includes a housing 4 having a sealed space 4a (see FIG. 4) filled with hydraulic oil (not shown). The housing 4 is interposed via a mounting bracket 5 as shown in FIG. It is attached to the upper end of the door 104.

  As shown in FIG. 4, the mounting bracket 5 has a U-shaped hook portion 5a formed at one end (the left end in FIG. 4) and an attachment piece portion 5b that rises obliquely at the other end (the right end in FIG. 4). The mounting piece 5b is formed with two screw holes (not shown) for attaching the housing 4 in the vertical direction. Further, two screw insertion holes (not shown) are formed penetrating up and down near both ends of the mounting bracket 5.

  The housing 4 is formed in a rectangular parallelepiped shape with six surfaces including a front wall 6, a rear wall 7, an upper surface wall 8, a lower surface wall 9 and a pair of left and right side walls 10. A recessed portion 11 surrounded by the wall 9 and the left and right side walls 10 is formed. Further, a latch pin 12 is disposed on one end side (left end side in FIG. 4) of the recessed portion 11 so as to be bridged up and down by the upper surface wall 8 and the lower surface wall 9. Furthermore, two screw insertion holes (not shown) are vertically formed through the one side wall 10 (on the right side in FIG. 4).

  In order to attach the door closer body 2 to the inside of the upper end of the door 104, first, screws 13 (see FIG. 2) are inserted into the four screw insertion holes of the mounting bracket 5 and screwed into the mounting plate 106 inside the door 104. Thus, the mounting bracket 5 is attached to the upper end of the door 104.

  Next, the door closer body 2 is disposed in front of the mounting bracket 5, the hook 5 a of the mounting bracket 5 is hooked on the latching pin 12 of the housing 4, and the mounting bracket 5 is disposed in the recessed portion 11 of the housing 4. From this state, screws 14 (see FIG. 3) are screwed into the two screw insertion holes of the housing 4 and the two screw holes of the mounting bracket 5, so that the door closer body 2 is connected to the door 104 via the mounting bracket 5. Attach to the top.

  In the housing 4 (sealed space 4a), as shown in FIG. 4, the piston 15 can reciprocate while being urged in the left direction in FIG. 4 by the spring force of the coil spring 16 as the piston urging means. The sealed space 4a is divided into a high pressure chamber 2a (a small region on the left side in FIG. 4) and a low pressure chamber 2b (a large region on the right side in FIG. 4) by the piston 15. In FIG. 4, reference numeral 17 denotes an end plug that is fitted into the fitting hole 10 b of the side wall 10.

  A cavity 15a is formed inside the piston 15, and the cavity 15a communicates with the high pressure chamber 2a through a first passage 18 and communicates with the low pressure chamber 2b through a second passage 19. doing. In addition, a check valve 20 is interposed in the first passage 18, and when the door is closed, the check valve 20 is pressed against the valve seat by the internal pressure of the hydraulic oil on the high pressure chamber 2 a side to close the first passage 18. The hydraulic oil on the high pressure chamber 2a side is prevented from flowing into the low pressure chamber 2b side.

  A rack and pinion mechanism 21 is incorporated in the cavity 15 a of the piston 15. The rack and pinion mechanism 21 includes a rack 22 formed on the inner wall of the hollow portion 15 a and a pinion 23 that meshes with the rack 22. As shown in FIG. 5, a rotating shaft 24 is connected to the pinion 23 so as to rotate integrally so as to penetrate the housing 4 up and down. Specifically, the pinion 23 is formed integrally with the central portion of the rotating shaft 24. In FIG. 5, reference numeral 25 denotes a bearing arranged on the outer periphery of the upper end 24 a side and the lower end 24 b side of the rotary shaft 24, 26 denotes an O-ring arranged outside the bearing 25 in the axial direction of the rotary shaft 24, and 27 denotes these A bushing 28 containing the bearing 25 and the O-ring 26 is a cylindrical cup that covers the lower end 24 b of the rotating shaft 24.

  One end of a link mechanism 29 is connected to the upper end 24a of the rotating shaft 24, and the other end of the link mechanism 29 is connected to the upper frame 102 side of the door opening 101 of the building. Specifically, the link mechanism 29 includes a main arm 30 and a connecting arm 31, and one end of the main arm 30 is connected to the upper end 24 a of the rotating shaft 24 by a shaft 32, and the other end of the main arm 30 is connected. The one end of the connecting arm 31 is rotatably connected around the shaft 33. On the other hand, the base end of the stay (triangular plate) 34 is attached to the upper frame 102 of the door opening 101 by screwing four screws 35 into the mounting plate 107 inside the upper frame 102 (FIGS. 1 and 3), the other end of the connecting arm 31 is connected to the tip of the stay 34 so as to be rotatable around a shaft 36.

  On the other side wall 10 of the housing 4 (left side in FIG. 1), three metal speed regulating valves 37 are inserted so that one is located on the upper side and two on the lower side outside the end plug 17. (Refer to FIG. 6), facing the flow path (not shown) that connects between the high pressure chamber 2a and the low pressure chamber 2b of the sealed space 4a, the hydraulic fluid that flows in the sealed space 4a in conjunction with the movement of the piston 15 The closing speed of the door 104 is adjusted by controlling the flow rate.

  Then, when the door 104 is opened in the direction of the arrow X1 (counterclockwise) in FIG. 4, the rotational movement is transmitted to the rotary shaft 24 via the link mechanism 29, and the rotary shaft 24 is shown by the arrow in FIGS. Rotate in X2 direction (clockwise). As a result, the pinion 23 rotates in the direction of arrow X2 (clockwise) in FIGS. 1 and 4, and the piston 15 compresses the coil spring 16 against the spring force of the coil spring 16 via the rack and pinion mechanism 21. While moving in the sealed space 4a of the housing 4 in FIG. As a result, the hydraulic oil in the low pressure chamber 2b moves through the second passage 19 and the hollow portion 15a to move the check valve 20 to open the first passage 18 and flows out to the high pressure chamber 2a. Then, the door 104 is opened while accumulating the force for moving in the closing direction.

  When the hand is released from the door 104, the compressed coil spring 16 is extended by the repulsive force, and the piston 15 linearly moves in the sealed space 4a of the housing 4 in the arrow Y3 direction (left direction) in FIG. At this time, since the first passage 18 is closed by the check valve 20, the hydraulic oil in the high pressure chamber 2 a does not flow into the low pressure chamber 2 b through the first passage 18, and a flow path and a speed adjustment valve 37 (not shown) are connected. Then, it flows into the low pressure chamber 2b. As a result, the pinion 23 rotates in the direction of arrow Y2 (counterclockwise) in FIGS. 1 and 4, and this rotational force is transmitted to the link mechanism 29, so that the door 104 moves in the direction of arrow Y1 (clockwise) in FIGS. ) Slowly and automatically closes.

  As shown in FIG. 5, the rotating shaft 24 has a through hole extending in the axial direction. More specifically, the rotating shaft 24 includes screw holes 24A and 24A formed on the upper end 24a side and the lower end 24b side of the rotating shaft 24, respectively, and a communication hole 24B that communicates the two screw holes 24A and 24A. A through hole is provided. The screw portion of the shaft 32 described above is screwed into the screw hole 24A on the upper end 24a side, and one end of the main arm 30 is connected to the upper end 24a of the rotary shaft 24. A screw hole 24C is formed at a location where the pinion 23 is formed in the central portion of the rotary shaft 24 so as to extend perpendicular to the axis of the rotary shaft 24, and the communication hole 24B between the cavity 15a and the rotary shaft 24 is formed. And communicate with. The screw hole 24C is screwed with a resin screw 38 that is sealed by applying an adhesive or the like, so that the hydraulic oil in the cavity 15a does not flow out through the screw hole 24C. The screw hole 24C is closed. The resin screw 38 is melted and pushed out into the communication hole 24B by the pressure of the hydraulic oil when the temperature of the housing 4 reaches 120 to 200 ° C. for some reason. When the resin screw 38 is pushed out from the screw hole 24C, the hydraulic oil in the cavity 15a is discharged from the lower end 24b of the rotary shaft 24 through the screw hole 24C, the communication hole 24B, and the lower screw hole 24A. It has become. The resin screw 38 corresponds to the resin member of the present invention, and the screw hole 24C, the communication hole 24B, and the lower screw hole 24A correspond to the hydraulic oil discharge passage of the present invention.

  The cylindrical cup 28 covers and conceals the lower end 24 b of the rotary shaft 24 by being press-fitted into a substantially columnar portion 9 </ b> A that protrudes downward from the lower surface wall 9 of the housing 4. A plurality of concave portions 9a are formed on the outer peripheral surface of the substantially cylindrical portion 9A. The cup 28 is provided with a discharge hole 28A at the bottom edge of the cup 28. When hydraulic oil is discharged from the screw hole 24A of the rotary shaft 24 into the internal space 28a of the cup 28, the cup 28 operates through the discharge hole 28A. Oil is allowed to fall to the floor. The discharge hole 28 </ b> A is formed as an inclined hole that is inclined with respect to the axis of the rotary shaft 24. The cup 28 includes a positioning portion 28 </ b> B that protrudes in the horizontal direction from the upper edge toward the door 104. The positioning portion 28 </ b> B is formed with a convex portion 28 </ b> C protruding upward, and the cup 28 is positioned by fitting the convex portion 28 </ b> C into the concave portion 9 </ b> B provided in the lower surface wall 9 of the housing 4. The cup 28 cannot rotate after being press-fitted into the substantially cylindrical portion 9A, and the discharge hole 28A is always located on the front side (front wall 6 side) of the door closer 1. The convex portion 28C of the cup 28 and the concave portion 9B of the housing correspond to the positioning means of the present invention.

  Thus, in this embodiment, the hydraulic oil discharge path which connects the cavity part 15a (sealed space 4a) and the internal space 28a of the cup 28 is formed in the inside of the rotating shaft 24, and the screw hole which comprises a hydraulic oil discharge path 24C is closed by a resin screw 38 having a melting point lower than that of the speed adjusting valve 37. Therefore, even if the temperature of the door 104 becomes high for some reason, the housing before the hydraulic oil leaks out from around the end plug 17 and the rotary shaft 24 or the hydraulic oil blows out from the position of the speed adjustment valve 37. At the timing when 4 reaches 120 to 200 ° C., the hydraulic oil in the sealed space 4a can be discharged to the internal space 28a of the cup 28 through the screw hole 24C, the communication hole 24B, and the lower screw hole 24A.

  In the present embodiment, since the resin screw 38 for closing the hydraulic oil discharge passage is disposed inside the rotary shaft 24 that is less affected by the internal pressure of the hydraulic oil than the end plug 17 or the like, During use, the internal pressure of the hydraulic oil does not increase rapidly and the hydraulic oil does not leak to the outside from the location of the resin screw 38.

  In the present embodiment, the hydraulic oil discharged into the internal space 28 a of the cup 28 is positioned on the front side (front wall 6 side) of the door closer 1 and the discharge hole 28 </ b> A is inclined with respect to the axis of the rotary shaft 24. The hydraulic oil can be discharged away from the door 104 in the direction away from the door 104 (on the side opposite to the door 104), and the hydraulic oil adheres to the hot door 104. Can be prevented.

  Further, in the present embodiment, since the cup 28 provided in the door closer 1 is conventionally used and hydraulic oil is dropped to the floor from the discharge hole 28A formed in the cup 28, there are parts other than the resin screw 38. There is no increase and the design is excellent.

  The door closer of the present invention is not limited to the above-described embodiment, and various modifications and improvements can be made within the scope described in the claims. For example, in the above-described embodiment, the speed adjustment valve 37 is made of metal, but the speed adjustment valve 37 is made of resin on the condition that the melting point is sufficiently higher than the resin screw 38 as the resin member. Also good.

  In the above-described embodiment, the resin screw 38 is screwed into the screw hole 24C formed in the rotating shaft 24. However, the screw hole 24C is a hole in which no screw is formed, and a resin ball or a resin pin is used. The hydraulic oil discharge passage may be closed by press-fitting.

  In the embodiment described above, the resin screw 38 is screwed into the screw hole 24C formed in the rotating shaft 24. However, as shown in FIG. 7, the screw hole 24C is a hole 24D in which no screw is formed. The operating discharge passage may be closed by screwing resin screws 39, 39 into the screw holes 24A, 24A. In the case of such a configuration, the resin screw 39 is melted and the hydraulic oil is discharged from the lower end 24b of the rotating shaft 24 to the internal space 28a of the cup 28 at the timing when the housing 4 reaches 120 to 200 ° C. Can do.

  In the above-described embodiment, the cup 28 is positioned by fitting the convex portion 28 </ b> C of the cup 28 into the concave portion 9 </ b> B of the housing 4. An insertion hole may be formed and the cup 28 may be screwed with a screw. In this case, a screw hole, a screw insertion hole, and a screw correspond to the positioning means of the present invention. Further, as shown in FIG. 8, a position restricting portion 28 </ b> D is provided on the cup 28, and the position restricting portion 28 </ b> D is provided on the lower surface wall of the housing 4 unless the position restricting portion 28 </ b> D is located on the front side (front wall 6 side) of the door closer 1. 9 so that the cup 28 cannot be press-fitted into the cylindrical portion 9A. In this case, the position restricting portion 28D corresponds to the positioning means of the present invention.

  In the above-described embodiment, the bottom surface of the cup 28 is a horizontal surface. However, as shown in FIG. 9, the bottom surface of the cup 28 is on the door 104 side from the position of the discharge hole 28A (right direction in FIG. 9). The height of the cup 28 (the length from the bottom wall 9 of the housing 4 to the bottom surface of the cup 28) may be formed as an inclined surface that decreases toward the bottom. If the cup 28 has such an inclined surface, it is possible to prevent the hydraulic oil discharged from the discharge hole 28 </ b> A from passing through the cup 28 and adhering to the door 104.

DESCRIPTION OF SYMBOLS 1 Door closer 2a High pressure chamber 2b Low pressure chamber 4 Housing 4a Sealed space 6 Front wall 9 Lower surface wall 9A Cylindrical part 9B Recessed part (positioning means)
10 Side wall 15 Piston 16 Coil spring (piston biasing means)
17 End plug 21 Rack and pinion mechanism 22 Rack 23 Pinion 24 Rotating shaft 24A Screw hole (hydraulic oil discharge path)
24B Communication hole (hydraulic oil discharge path)
24C Screw hole (hydraulic oil discharge path)
24D hole (hydraulic oil discharge path)
24a upper end 24b lower end 28 cup 28A discharge hole 28B positioning part 28C convex part (positioning means)
28D Position restriction part (positioning means)
29 Link mechanism 37 Speed control valve 38 Resin screw (resin member)
39 Resin screw (resin member)
101 Door opening 102 Upper frame 104 Door

Claims (4)

A housing having a sealed space filled with hydraulic oil;
A piston disposed in the sealed space so as to be capable of reciprocating in a state of being biased by a piston biasing means;
A rack and pinion mechanism incorporated in the piston;
A rotating shaft connected integrally to the pinion of the rack and pinion mechanism so as to penetrate the housing up and down;
A link mechanism having one end connected to the upper end of the rotating shaft and the other end connected to the upper frame side of the door opening of the building;
A speed adjustment valve that is inserted into the side wall of the housing and adjusts the closing speed of the door by controlling the flow rate of the hydraulic fluid flowing in the sealed space in conjunction with the movement of the piston;
When the door is opened, the rotational movement is converted into a linear movement of the piston via the link mechanism, the rotary shaft and the rack and pinion mechanism, and the pinton is resisted against the biasing force of the piston biasing means. A door closer configured to move the piston in the sealed space of the housing by the biasing force of the piston biasing means by moving the handle away from the door and automatically close the door slowly,
The rotating shaft includes a hydraulic oil discharge passage for discharging hydraulic oil from the sealed space when the housing becomes hot.
The door closer characterized in that the hydraulic oil discharge passage is closed by a resin member.   2. The cup according to claim 1, wherein a cup covering the lower end of the rotating shaft is provided, and the hydraulic oil discharged from the hydraulic oil discharge passage is discharged to the outside through a discharge hole formed in the cup. Door closer.   The door closer according to claim 2, further comprising positioning means for positioning the discharge hole on a front side of the door closer.   The door closer according to claim 3, wherein the discharge hole is formed to be inclined with respect to the axis of the rotating shaft.

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