JP4642058B2 - Vertical door closer - Google Patents

Description

  The present invention relates to a vertical door closer for automatically closing a rotary door.

  2. Description of the Related Art Conventionally, as a vertical door closer, for example, as disclosed in Patent Document 1, it is provided in a stationary state with respect to the floor side, a support shaft that supports a door, and an internal damper that is fixed to the support shaft. Damper oil is enclosed in the room, and a cylinder that rotates as the door opens and closes, a piston that is screwed in the cylinder and has a reverse support valve, and moves up and down by the rotation of the cylinder, A speed adjusting rod that is penetrated through the through hole and adjusts the closing speed at the time of the closing operation, and a cylindrical body that is fitted in the through hole of the piston and has a speed adjusting passage at the top and bottom, is opened during the closing operation. There is known one in which the amount of damper oil passing through the speed control passage is regulated by a speed control rod.

  In the vertical door closer disclosed in Patent Document 1, an adjustment knob provided in parallel with the upper end of the casing is turned at the upper end of the adjustment rod so as to adjust the amount of damper oil passing through, that is, the closing speed. However, the adjustment knob is located in parallel with the upper end of the casing and has a thin plate shape.

Therefore, in order to solve such a problem, it is conceivable to employ a speed control mechanism of an automatic door closing device as disclosed in Patent Document 2.
The speed control mechanism of the automatic door closing device disclosed in Patent Document 2 includes an adjustment rod that is rotatably provided in the center hole of the pivot shaft, and the rotation control device that is operated by a tool such as a driver. An automatic door closing mechanism for adjusting the closing speed of the automatic closing device by rotating the adjusting rod from the side. A pair of transmission gears arranged at symmetrical positions with the bevel teeth meshing with the bevel teeth and a connecting hole that opens to the side of the frame side seating plate attached to the upper part of the frame and is rotatably inserted and transmitted. An operation member that is engaged with any one of the gears and that rotates and adjusts the adjustment rod by a rotation operation by the tool is provided.
No. 7-52922 No. 4-9428

  When a vertical axis door closer is configured by replacing the speed adjusting mechanism disclosed in Patent Document 2 as the speed adjusting mechanism of the vertical door closer disclosed in Patent Document 1, it is disclosed in Patent Document 2. The speed control mechanism of the automatic door closing device, as disclosed in the drawing of Patent Document 2, has an operating member engaged with one of the transmission gears of the pair of transmission gears, The adjustment gear can be adjusted by rotating the transmission gear. However, one of the transmission gears is not completely coupled to the operation member, and the one transmission gear and the other gear are not coupled. Both of them are only inserted into the through hole of the pivot shaft, and are engaged with each other when rotating one of the transmission gears with a tool to rotate the umbrella tooth portion of the head of the adjusting rod. A pair of transmissions A force is exerted between the arm and the umbrella tooth of the head of the adjusting rod, and the pair of transmission gears move away from the umbrella tooth of the head of the adjusting rod in the through hole of the pivot shaft. It is difficult to move and maintain a stable meshing state at all times, and there arises a problem that even if one of the transmission gears is rotated by a tool, it rotates idly. Further, since the pair of transmission gears are housed in the through-holes of the pivot shaft, the size of the pair of transmission gears is limited. The pair of transmission gears is small, and high component accuracy is required.

  In the present invention, when the operation-side bevel gear that meshes with the bevel gear on the head of the adjustment rod is rotated by a jig such as a screwdriver, Even if a force to move away from each other works, the bevel gear on the operation side always maintains a stable meshing state between the bevel gears without being separated from the bevel tooth portion of the head of the adjusting rod. A comparatively large bevel gear can be used for both the bevel tooth portion of the head of the adjusting rod, and it is intended to facilitate manufacture and assembly.

  According to a first aspect of the present invention, a vertical door closer is provided with a spring in the pipe-shaped main body facing the up and down direction, which applies a biasing force in the closing direction to the rotary door, and a serration shaft at the upper end of the main body. As the revolving door is opened and closed, it is guided by the serration shaft and rises when the revolving door is opened, descends when the revolving door is closed, and the damper oil that exists above and below the lower end of the piston lid serves as the operating direction. A piston is provided on the opposite side of the piston lid, and a valve pin insertion hole is formed at the center of the piston lid, and a damper oil flow path is formed at a position shifted from the center. A check valve that closes the flow path when the rotary door is closed is provided inside the flow path, and the valve pin has a shaft diameter at the lower end that is slightly smaller than the inner diameter of the insertion hole. Formed into The shaft diameter is gradually reduced from the lower end portion toward the upper end, and is configured to protrude below the piston lid. The upper end of the valve pin has an internal thread on the inner surface of the central hole portion of the serration shaft. A valve head having a male screw threaded on the outer surface is coupled, and a height adjustment portion of the valve pin is provided at the upper end of the main body, and the height adjustment portion straddles the upper end recess of the serration shaft. The operation shaft is disposed in the diametrical direction and is rotatably supported at both ends by the serration shaft. The operation shaft is engaged with the valve head so that the upper tooth portion is exposed on the bottom of the recess. A bevel gear that meshes with the upper end tooth portion of a bevel gear that is rotatably inserted in the central hole portion of the serration shaft is mounted, and the upper end concave portion of the serration shaft has a rectangular tube shape, and the operation On the axis Wherein the rear of the throw has been bevel gear is configured to abut directly in terms on the inner surface of the upper end recess serrations axis.

  As described above, the vertical door closer according to the present invention has a bevel tooth portion on the head of the adjustment rod by rotating the bevel gear on the operation side meshing with the bevel gear on the head of the adjustment rod with a jig such as a screwdriver. Even if a force is exerted between the two bevel gears to move them apart, the operation side bevel gear is in direct contact with the inner surface of the upper end recess of the serration shaft. It is possible to always maintain a stable meshing state between the two bevel gears without leaving the bevel tooth portion. Further, since the bevel gear mounted on the operation shaft is located in the upper end recess of the serration shaft, a relatively large bevel gear can be used for both the bevel gear on the operation side and the bevel tooth portion of the head of the adjustment rod. Manufacture and assembly can be performed easily.

Embodiments of the present invention will be specifically described below with reference to the drawings.
First, the first embodiment shown in FIGS. 1 to 7 will be described. Reference numeral 1 denotes a pipe-shaped main body that faces in the vertical direction. An arm 3 that is screwed from below is attached to the bottom end of the width direction of the type door 2. A main shaft 4 is provided in the main body 1 so as to be rotatable about the vertical axis with respect to the main body 1 upward from the lower end. The upper end of the main shaft 4 is positioned slightly above the middle portion of the vertical length of the main body 1, the lower end of the main shaft 4 protrudes from the lower end of the main body 1, and the angular shaft 5 is externally fitted to the protruding portion to be pin-coupled. Yes. In addition, a spring 6 is fitted on the main shaft 4 inside the main body 1, and the lower end of the spring 6 is locked to a spring locking fitting 7 attached to the main shaft 4, and the upper end of the spring 6 is connected to the main shaft 4. It is locked to a washer 8 that is rotatable and coupled to the main body 1.

  A cylinder 9 is provided inside the main body 1 above the main shaft 4. The lower end of the cylinder 9 is externally fitted to the upper end of the main shaft 4 and is coupled to the main shaft 4. An internal thread 10 is formed on the inner surface of the cylinder 9.

  11 is a serration shaft attached inside the upper end of the main body 1, and includes a large diameter portion 11a, a medium diameter portion 11b, and a small diameter portion 11c from the upper end side. The large diameter portion 11a has an outer surface on the upper end inner surface of the main body 1. The outer surface of the middle diameter portion 11b is in contact with the inner surface of the upper end of the cylinder 9, and the small diameter portion 11c is formed with vertical grooves 11d directed in the vertical direction at appropriate intervals in the circumferential direction.

  A piston 12a is formed on the inner surface of a longitudinal groove 12a that meshes with the longitudinal groove 11d of the small diameter portion 11c of the serration shaft 11. The piston 12 moves up and down with respect to the serration shaft 11. A male screw 12b to be screwed is formed. More specifically, the piston 12 is open at the upper end and has a vertical groove 12 a formed from the upper end to the vicinity of the lower end. The lower end of the piston 12 is closed by the piston lid 13. The piston lid 13 is formed with an insertion hole 13a for the valve pin 14 at the center, and is filled between the serration shaft 11 and the upper end of the main shaft 4 at a position shifted from the center. A damper oil passage 13b is formed, and a spherical check valve 15 for closing the passage 13b from below is provided inside the passage 13b.

  The valve pin 14 is coupled to the upper end of the valve head 16 having a groove 16 a vertically oriented at the upper end, and is provided in the center hole 11 e of the serration shaft 11. The formed male screw 16 b is screwed into the female screw 11 f on the inner surface of the center hole portion 11 e of the serration shaft 11. The valve pin 14 is formed so that the shaft diameter at the lower end is slightly smaller than the inner diameter of the insertion hole 13a, and the shaft diameter is gradually decreased from the lower end toward the upper end. And protrudes below the piston lid 13.

  Reference numeral 17 denotes a shaft portion 17b that is rotatably inserted into the central hole portion 11e of the serration shaft 11 so that the inner surface formed at the upper end of the serration shaft 11 is exposed on the bottom portion of the cylindrical recess 18. In the bevel gear, an insertion piece 17c is inserted from the lower end of the shaft portion 17b into the groove 16a of the valve head 16 from above.

  Reference numeral 19 denotes an operation shaft disposed in the diameter direction of the serration shaft 11 so as to straddle the recess 18 at the upper end of the serration shaft 11, and both ends of the operation shaft 19 are rotatably supported by the serration shaft 11. The bevel gear 20 that meshes with the upper end tooth portion 17a of the bevel gear 17 is mounted. Reference numeral 25 denotes a spacer interposed between the back surface of the bevel gear 20 and the inner surface of the recess 18, and one surface of the spacer 25 is formed flat and abuts against the flat back surface of the bevel gear 20. The surface is formed as an arc surface so as to abut the inner surface of the concave portion 18 by the surface. In other words, the spacer 25 is interposed in the gap between the back surface of the bevel gear 20 and the inner surface of the recess 18 so that extra play of the bevel gear 20 is eliminated.

  Reference numeral 21 denotes a sealing O-ring mounted on the outer surface of the upper end of the piston 12 and press-contacts the inner surface of the cylinder 9 above the internal thread 10 of the cylinder 9. Reference numeral 22 denotes a sealing O-ring attached to the outer surface of the lower end of the middle diameter portion 11 b of the serration shaft 11, and press-contacts the upper end inner surface of the cylinder 9. Reference numeral 23 denotes a sealing O-ring mounted on the outer surface of the shaft portion 17 b of the bevel gear 17, and press-contacts the upper end inner surface of the center hole portion 11 e of the serration shaft 11. Further, the square shaft 5 projecting downward from the arm 3 at the lower end of the main body 1 is fitted into a bearing bracket 24 embedded in the floor so as not to rotate from above.

  The vertical door closer with the above configuration is set inside the lower end of the rotary door 2, and the arm 3 is screwed to the lower end of the rotary door 2 from below. As a result, the main body 1 of the vertical door closer is rotated integrally with the rotary door 2. Further, the square shaft 5 projecting downward from the arm 3 at the lower end of the main body 1 is fitted so as not to rotate into a bearing fitting 24 embedded in the floor surface. Thereby, the main shaft 4 as well as the angular shaft 5 is fixed to the floor surface side. The main body 1 rotates integrally with the rotary door 2, so that when the rotary door 2 is opened, the spring 6 is twisted to accumulate the urging force when the rotary door 2 is closed. When the hand is released from the opened rotary door 2, the rotary door 2 is automatically closed by the biasing force of the spring 6.

  Next, a brake force adjusting mechanism including a cylinder 9, a piston 12, a serration shaft 11, a valve pin 14, a valve head 16, a bevel gear 17, an operation shaft 19, and a bevel gear 20 provided on the upper portion of the main body 1 will be described. . An operation hole (not shown) is formed in the rotary door 2 at the position of the operation shaft 19. A jig such as a screwdriver is inserted through the operation hole so that the tip of the jig is connected to one end of the operation shaft 19. The bevel gear 17 is rotated around the vertical axis via the bevel gear 20 mounted on the operation shaft 19 by engaging with the groove portion 19a and rotating the operation shaft 19 around the horizontal axis with a jig in this state. To do. An insertion piece 17 c protruding downward from the bevel gear 17 is engaged with the valve head 16, and the valve pin 14 is rotated together with the valve head 16 by the rotation of the bevel gear 17. The valve head 16 has a male screw 16b on the outer surface at the lower end engaged with a female screw 11f on the inner surface of the center hole portion 11e of the serration shaft 11, so that the valve head 16 moves the valve pin 14 up and down together while rotating. The height of the valve pin 14 is adjusted.

  When the rotary door 2 is rotated, the main body 1 is also rotated, the serration shaft 11 is also rotated, and the piston 12 is in a state where the vertical groove 12a is engaged with the vertical groove 11d of the small diameter portion 11c of the serration shaft 11. Also rotate. At this time, the piston 12 has the male screw 12 b screwed into the female screw 10 of the cylinder 9 and moves up and down with respect to the serration shaft 11. Specifically, when the rotary door 2 is closed, the piston 12 is fully lowered as shown in FIG. 3, and when the rotary door 2 is opened from this state, the piston 12 is raised. The state shown in FIG. At this time, the damper oil present inside and above the piston 12 is pushed by the piston 12 and flows into the lower side of the piston 12 while pushing the check valve 15 open from the flow path 13b. At this time, a part of the damper oil flows into the lower part of the piston 12 through the gap between the insertion hole 13 a at the lower end of the piston 12 and the valve pin 14. When the piston 12 rises, the valve pin 14 protrudes greatly from the lower end of the piston 12. The protrusion length of the valve pin 14, that is, the height of the valve pin 14 is adjusted in advance as described above. When the rotary door 2 is opened, the spring 6 is twisted to store the biasing force in the closing direction of the rotary door 2, and when the hand is released from the opened rotary door 2, the spring 6 is released. The revolving door 2 is automatically closed by the urging force 6. The valve pin 14 is provided to apply a brake when the rotary door 2 is closed. When the rotary door 2 is closed, the piston 12 moves downward, and an insertion hole at the lower end of the piston 12 is provided. The gap between 13a and the valve pin 14 is gradually narrowed. The damper oil existing below the piston 12 is pushed by the piston 12 due to the downward movement of the piston 12 and tries to escape inside and above the piston 12, but the flow path 13b is closed when the check valve 15 is pushed. Therefore, the damper oil flow path is only from the gap between the insertion hole 13 a and the valve pin 14. Since the clearance between the insertion hole 13a and the valve pin 14 is gradually narrowed as the rotary door 2 is closed, the braking force is stronger at the closing end than at the beginning of the closing of the rotary door 2, so that the rotary door. The speed at the closing end of 2 is drastically reduced so that the rotary door 2 can be closed quietly. The closing speed of the rotary door 2 is adjusted by moving the valve pin 14 up and down together while rotating the valve head 16 via the bevel gear 20 and the bevel gear 17 by operating the operation shaft 19 as described above. This can be done by adjusting the height of the valve pin 14 with respect to the insertion hole 13a at the lower end of Twelve. 6 and 7 show a state in which the height of the valve pin 14 is adjusted so that the braking force when the rotary door 2 is closed is weakened. The operation shaft 19 is attached to the adjusting portion in such a manner that the operation shaft 19 is disposed in the diameter direction of the serration shaft 11 so as to straddle the recess 18 at the upper end of the serration shaft 11, and both ends are rotatably supported by the serration shaft 11. A bevel gear 20 that meshes with an upper end tooth portion 17 a of the bevel gear 17 is attached to the operation shaft 19. Therefore, even if an upward pushing force is applied to the bevel gear 17 by the damper oil inside the door closer, the bevel gear 20 on the operation shaft 19 side that meshes with the bevel gear 17 is not inclined, and the operability is improved. it can.

  Next, a second embodiment shown in FIGS. 8 and 9 will be described. In the second embodiment, the spacer 25 in the first embodiment is omitted. The concave portion 18 at the upper end of the serration shaft 11 is formed in a rectangular tube shape, and the flat rear surface of the bevel gear 20 is flat in the concave portion 18. It is comprised so that it may contact | abut directly on the inner surface.

It is a partially cutaway front view of a revolving door which shows the state where the vertical axis type door closer in the 1st embodiment of the present invention was set in the revolving door. It is sectional drawing of the vertical axis | shaft type door closer in the open state of the rotation type door. It is sectional drawing of the vertical axis | shaft type door closer in the closed state of the rotation type door. It is a top view of the vertical axis | shaft type door closer. It is XX sectional drawing of FIG. It is sectional drawing of the vertical axis | shaft type door closer in the open state of the rotary door adjusted so that the brake force at the time of the rotary door closing of the vertical axis | shaft type door closer might become weak. It is sectional drawing of the vertical axis | shaft type door closer in the closed state of the rotary door adjusted so that the brake force at the time of the rotary door closing of the vertical axis | shaft type door closer might become weak. It is a top view of the vertical axis | shaft type door closer in the 2nd Embodiment of this invention. It is YY sectional drawing of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body 2 Rotating door 3 Arm 4 Main shaft 5 Square shaft 6 Spring 7 Spring latching metal 8 Washer 9 Cylinder 10 Female screw 11 Serration shaft 11a Large diameter part 11b Medium diameter part 11c Small diameter part 11d Vertical groove 11e Center hole part 11f Female thread 12 Piston 12a Vertical groove 12b Male thread 13 Piston lid 13a Insertion hole 13b Flow path 14 Valve pin 15 Check valve 16 Valve head 16a Groove 16b Male screw 17 Bevel gear 17a Upper end tooth part 17b Shaft part 17c Insertion piece 18 Recess 19 Operation shaft 19a Groove part 20 Bevel gear 24 Bearing bracket 25 Spacer

Claims (1)

A spring that applies a biasing force in the closing direction to the revolving door is provided in the pipe-shaped main body facing up and down, and a serration shaft is provided at the upper end of the main body. The piston lid is provided with a piston that rises when the pivoting door is opened, descends when the pivoting door is closed, and pushes the damper oil that exists above and below the piston lid at the lower end to the opposite side of the operation direction. A valve pin insertion hole is formed at the center, and a damper oil passage is formed at a position deviated from the center, and the passage is formed inside the passage when the rotary door is closed. The valve pin is formed so that the shaft diameter at the lower end is slightly smaller than the inner diameter of the insertion hole, and the shaft diameter gradually increases from the lower end toward the upper end. Becomes smaller The valve head is formed to protrude downward from the piston lid, and has a valve head on the outer surface of which an external thread is formed on the upper end of the valve pin to be engaged with the internal thread of the inner surface of the center hole of the serration shaft. It is connected, and the height adjustment part of the valve pin is provided at the upper end of the main body. This height adjustment part is arranged in the diameter direction of the serration shaft so as to straddle the upper end recess of the serration shaft, and both ends can be rotated to the serration shaft. The operation shaft is supported, and the operation shaft is engaged with the valve head, and the shaft portion is rotatably inserted into the central hole portion of the serration shaft so that the upper tooth portion is exposed on the bottom portion of the recess. A bevel gear that meshes with the upper end tooth portion of the bevel gear is mounted, the upper end recess portion of the serration shaft has a rectangular tube shape, and the back surface of the bevel gear mounted on the operation shaft is the upper end recess portion of the serration shaft The vertical axis type door closers, characterized in that it is configured to abut directly to the plane.

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