JP2014095215A - Concealed door closer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a concealed door closer capable of preventing adhesion of hydraulic oil inside a housing to a door which becomes high temperature.SOLUTION: A concealed door closer 1 has: a housing 5 with a sealed space which is installed inside a door 3 via a mounting plate 2 and with which hydraulic oil is filled; a rotational axis 6 which vertically penetrates the housing 5; and an arm 7 which rotates the rotational axis 6 in accordance with opening/closing of the door 3. The concealed door closer 1 is further provided with: hydraulic oil discharge passages 6A, 6B, 6C for discharging the hydraulic oil from the sealed space when the housing 5 becomes high temperature; and an accommodation tank 25 which stores the hydraulic oil discharged from the hydraulic oil discharge passages 6A, 6B, 6C to the outside of the housing 5, and the hydraulic oil discharge passages 6A, 6B, 6C are closed by a resin screw 26.

Description

  The present invention relates to an improvement of a conshield door closer, and in particular, to a fire suppression measure.

  A conshielded door closer installed inside a fire door to automatically close a fire door that has been manually opened is known as disclosed in Japanese Patent Application Laid-Open No. H10-228707. Generally, the conshield 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 an arm is connected to the upper end of the rotating shaft, and a slider that slides on a rail fixed to the upper edge of the doorway is pivotally connected to the other end of the arm.

  When the fire door is manually opened, the rotational motion is transmitted to the rotary shaft through the arm, and further converted into a linear motion of the piston through the rack and pinion mechanism. As a result, the piston moves in the sealed space of the housing to compress the coil spring, and when the hand is released from the fire door, the fire door is slowly and automatically closed by the repulsive force of the compressed coil spring. It has become. The closing speed of the fire door is adjusted by controlling the flow rate of the working oil that flows in conjunction with the movement of the piston with a speed adjusting valve.

Japanese Utility Model Publication No. 6-48704

  However, in these conventional conshielded door closers, if the temperature of the fire door rises due to some reason, the internal pressure of the working oil inside the housing of the conshielded door closer rises, and the working oil flows from the part joints and around the rotating shaft to the outside. There is a risk of overflowing. Then, if the overflowing hydraulic oil adheres to the fire door that has become hot, it may ignite in some cases. In addition, the speed adjustment valve for controlling the flow rate of the hydraulic oil may be made of resin, and the speed adjustment valve made of resin is melted by heat, and the hydraulic oil blown out from the portion becomes similarly high in temperature. There is also a risk of catching fire on the fire door.

  This invention is made | formed in view of this point, The place made into the objective is providing the conshield door closer which can prevent the hydraulic fluid inside a housing adhering to the door which became high temperature. .

  The present invention has been made to solve the above problems, and includes a housing 5 provided inside the door 3 via the mounting plate 2 and filled with hydraulic oil, and the housing 5 extending vertically. In a concealed door closer 1 having a rotating shaft 6 to be inserted and an arm 7 that rotates the rotating shaft 6 as the door 3 is opened and closed, hydraulic oil is discharged from the sealed space when the housing 5 becomes hot. Hydraulic oil discharge passages 6A, 6B, 6C and a storage tank 25 for storing the hydraulic oil discharged from the hydraulic oil discharge passages 6A, 6B, 6C to the outside of the housing 5, The hydraulic oil discharge paths 6A, 6B, 6C are closed by a resin member 26.

  Here, it is preferable that the hydraulic oil discharge passages 6 </ b> A, 6 </ b> B, 6 </ b> C are formed inside the rotary shaft 6.

  Moreover, it is preferable that a communication hole 25 </ b> C for communicating the internal space S in the storage tank 25 and the outside is formed in the upper part of the storage tank 25.

  According to the conshielded door closer of the present invention, when the temperature of the door becomes high due to some factor, the resin member closing the hydraulic oil discharge path is dissolved and the hydraulic oil is discharged from the inside of the housing into the storage tank. In addition, it is possible to suppress ignition due to the hydraulic oil inside the housing adhering to the heated door.

It is an external view of a conshield door closer according to the present embodiment. It is an internal structure figure of the conshield door closer concerning this embodiment. FIG. 3 is an enlarged view of a main part of FIG. 2.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an external view of a conshielded door closer according to the present embodiment, FIG. 2 is an internal structure diagram of the conshielded door closer according to the present embodiment, and FIG. 3 is an enlarged view of a main part of FIG.

  As shown in FIG. 1, the conshielded door closer 1 includes a door closer body 4 that is attached to the inside of the door 3 via an attachment plate 2. The door closer body 4 includes a housing 5 and a rotating shaft 6 that is pivotally supported by the housing 5 and rotates about an axis in the vertical direction. A base end portion of an arm 7 is attached to an upper end 6a (see FIG. 2) of the rotating shaft 6 by a shaft 27 so as not to be relatively rotatable. A rail 9 extending in the horizontal direction is attached to the upper edge of the door frame 8, and a resin slider (not shown) that is pivotally connected to the tip of the arm 7 is disposed in the rail 9. When the door 3 rotates, the arm 7 and the rotation shaft rotate together in accordance with the opening / closing operation, and the slider slides in the horizontal direction while being guided by the rail 9.

  As shown in FIG. 2, both ends of the housing 5 are closed by plugs 10 and 11, and the inside of the housing 5 is a sealed space. The housing 5 is filled with hydraulic oil (not shown). Inside the housing 5, the piston 12 is disposed so as to be able to reciprocate in a state where it is urged in the left direction in FIG. 2 by the spring force of two large and small coil springs 13 and 14 as piston urging means. The large diameter coil spring 13 and the small diameter coil spring 14 are arranged coaxially with each other. That is, the small-diameter coil spring 14 is inserted inside the large-diameter coil spring 13. The piston 12 divides the interior of the housing 5 into a first chamber 5a and a second chamber 5b and supports one end of the coil springs 13 and 14. The first chamber 5 a is a space between the piston 12 and the plug 11 inside the housing 5, and the second chamber 5 b is a space between the piston 12 and the plug 10.

  A hollow portion 12 a is formed inside the piston 12. The cavity 12a communicates with the first chamber 5a via a first passage 15 formed at one end of the piston 12, and the second chamber via a second passage 16 formed at the other end of the piston 12. It communicates with 5b. A check valve 16 </ b> A is incorporated in the second passage 16. The check valve 16A allows the hydraulic oil to flow from the first chamber 5a to the second chamber 5b, while preventing the hydraulic oil from flowing from the second chamber 5b to the first chamber 5a. It has become. The first chamber 5a and the second chamber 5b communicate with each other via a flow rate control passage 17 formed in the housing 5, and the flow rate control passage 17 is a metal speed that adjusts the flow rate of the hydraulic oil. A regulating valve 18 is provided. When the door 3 is opened (when the piston 12 moves to the right), the hydraulic oil moves from the first chamber 5a to the second chamber 5b through the first passage 15, the hollow portion 12a, and the second passage 16. When the door 3 closes (when the piston 12 moves to the left), the hydraulic oil moves from the second chamber 5b to the first chamber 5a through the flow rate control passage 17.

  As shown in FIG. 3, a rack and pinion mechanism 19 is incorporated in the cavity 12 a of the piston 12. The rack and pinion mechanism 19 includes a rack 20 formed on the inner wall of the cavity 12 a and a pinion 21 that meshes with the rack 20. A rotating shaft 6 is connected to the pinion 21 so as to rotate integrally so as to penetrate the housing 5 up and down. Specifically, the pinion 21 is formed integrally with the central portion of the rotating shaft 6. Reference numeral 22 denotes a bearing disposed on the outer periphery of the upper end 6a side and the lower end 6b side of the rotary shaft 6, 23 denotes an O-ring arranged outside the bearing 22 in the axial direction of the rotary shaft 6, and 24 denotes these bearings 22 and O. A bush 25 including the ring 23 and inserted through the lower end 6b of the rotary shaft 6 is a storage tank for storing hydraulic oil.

  The rotating shaft 6 includes a through hole extending in the axial direction. More specifically, the rotary shaft 6 is a through hole constituted by screw holes 6A and 6A formed on the upper end 6a side and the lower end 6b side, respectively, and a communication hole 6B communicating the two screw holes 6A and 6A. It has a hole. The screw portion of the shaft 27 is screwed into the screw hole 6A on the upper end 6a side, and the base end portion of the arm 7 is connected to the upper end 6a of the rotating shaft 6. A screw hole 6 </ b> C is formed at a position where the pinion 21 is formed in the central portion of the rotating shaft 6 so as to extend perpendicular to the axis of the rotating shaft 6, and the cavity 12 a of the piston 12 and the rotating shaft 6 The communication hole 6B is communicated. The screw hole 6C is screwed with a resin screw 26 that is sealed by applying an adhesive or the like so that the hydraulic oil in the housing 5 does not flow out through the screw hole 6C. The screw hole 6C is closed. The resin screw 26 is melted and pushed out into the communication hole 6B by the pressure of the hydraulic oil when the temperature of the housing 5 reaches 120 to 200 ° C. for some reason. When the resin screw 26 is pushed out from the screw hole 6C, the hydraulic oil in the housing 5 is discharged from the lower end 6b of the rotary shaft 6 through the screw hole 6C, the communication hole 6B, and the lower screw hole 6A. ing. The resin screw 26 corresponds to the resin member of the present invention, and the screw hole 6C, the communication hole 6B, and the lower screw hole 6A correspond to the hydraulic oil discharge passage of the present invention.

  Similar to the housing 5, a metal storage tank 25 that stores hydraulic oil is disposed inside the door 3. The storage tank 25 includes a cylindrical main body 25A that is long in the vertical direction and a plug 25B that closes the lower opening of the main body 25A. The storage tank 25 is fixed to the door closer body 4 by screwing a screw portion formed on the inner periphery of the upper opening of the main body portion 25 </ b> A with a screw portion formed on the outer periphery of the bush 24. The storage tank 25 stores the lower end 6b of the rotary shaft 6, and when the hydraulic oil is discharged from the lower screw hole 6A of the rotary shaft 6, the storage tank 25 stores the hydraulic oil in the internal space S thereof. It is like that. A communication hole 25 </ b> C for communicating the internal space S and the outside (atmosphere) is formed in the upper portion of the storage tank 25.

  As shown in FIG. 1, a thermal expansion refractory sheet 28 is provided on the upper surface of the mounting plate 2 for attaching the door closer body 4 to the inside of the door 3 and on the door tip side of the notch 3 a on the upper edge of the door 3. Is pasted. The thermally expanded refractory sheet 28 is normally a flexible and thin sheet having a thickness of about 1.8 mm, but expands to form a heat insulating layer instantly when the temperature exceeds a predetermined temperature. By affixing the thermal expansion refractory sheet 28 to the upper surface of the mounting plate 2, the heat insulating layer prevents the fire from spreading outside the door 3 even if ignition due to hydraulic oil occurs inside the door 3. Can be prevented. The slider that slides while being guided by the rail 9 is made of resin and may ignite. However, the thermal expansion refractory sheet 28 is provided at a portion closer to the door tip than the mounting plate 2 in the cutout portion 3 a on the upper edge of the door 3. Can be prevented from igniting by wrapping the slider with a heat insulating layer.

  Next, operation | movement of the conshield door closer 1 of this embodiment is demonstrated. When the door 3 is opened, the rotating operation is transmitted to the rotating shaft 6 via the arm 7 and the rotating shaft 6 rotates. As a result, the pinion 21 rotates, and the piston 12 compresses the coil springs 13 and 14 against the spring force of the coil springs 13 and 14 via the rack and pinion mechanism 19 while compressing the coil springs 13 and 14 in the right direction in the sealed space 4 of the housing 5. Move straight to. As a result, the hydraulic oil in the first chamber 5a moves through the first passage 15, the cavity 12a and the second passage 16 to move the check valve 16A and flows into the second chamber 5b. Then, the door 3 is opened while accumulating a force for moving in the closing direction.

  When the hand is released from the door 3, the compressed coil springs 13 and 14 are extended by the repulsive force, and the piston 12 linearly moves in the left direction in the sealed space of the housing 5. At this time, the hydraulic oil in the second chamber 5b does not flow into the first chamber 5a by the check valve 16A, but flows into the first chamber 5a through the flow rate control passage 17 and the speed adjustment valve 18. As a result, the pinion 21 rotates, and this rotational force is transmitted to the arm 7 so that the door 3 is slowly and automatically closed.

  In the conshielded door closer 1 of the present embodiment, a hydraulic oil discharge path that connects the sealed space of the housing 5 and the internal space S of the storage tank 25 is formed inside the rotary shaft 6, and screw holes that constitute the hydraulic oil discharge path 6C is closed by a resin screw 26 having a melting point lower than that of the speed adjusting valve 18. Therefore, even if the temperature of the door 3 becomes high for some reason, the hydraulic oil leaks from around the plugs 10 and 11 and the rotary shaft 6 or before the hydraulic oil blows out from the position of the speed adjustment valve 18. When the housing 5 reaches 120 to 200 ° C., the hydraulic oil in the sealed space of the housing 5 can be discharged into the internal space S of the storage tank 25 through the screw holes 6C and 6B and the lower screw hole 6A. .

  Moreover, in the conshield door closer 1 of this embodiment, the resin screw 26 for closing a hydraulic-oil discharge path inside the rotating shaft 6 which is hard to be influenced by the internal pressure of hydraulic oil compared with the plugs 10 and 11 etc. Therefore, the internal pressure of the hydraulic oil does not increase rapidly during normal use, and the hydraulic oil does not leak from the resin screw 26.

  In the conshield door closer 1 of the present embodiment, the communication tank 25C is formed in the upper part of the storage tank 25 so as to communicate the internal space S with the outside (atmosphere). It is possible to prevent the internal pressure of the sealed space of the housing 5 once lowered due to the discharge of the hydraulic oil from rising again.

  The conshield door closer 1 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 18 is made of metal, but the speed adjustment valve 18 is made of resin on the condition that the melting point is sufficiently higher than the resin screw 26 as a resin member. Also good.

  In the above-described embodiment, the resin screw 26 is screwed into the screw hole 6C formed in the rotating shaft 6. However, the screw hole 6C is a hole in which no screw is formed, and a resin ball or a resin pin is used. The hydraulic oil discharge path may be closed by press-fitting.

  In the above-described embodiment, the resin screw 26 is screwed into the screw hole 6C formed in the rotating shaft 6. However, the screw hole 6C is a hole where no screw is formed, and the resin screw is inserted into the screw hole 6A. The hydraulic oil discharge path may be closed by screwing.

  In the above-described embodiment, the hydraulic oil discharge passage is formed in the rotary shaft 6. However, when the hydraulic oil discharge passage is formed in the housing 5 or the plugs 10 and 11 and the resin member is melted. The hydraulic oil may be discharged from the hydraulic oil discharge path into the internal space of the storage tank attached to the door closer body 4.

  In the above-described embodiment, nothing is filled in the internal space S of the storage tank 25. However, a part of the internal space S may be filled with sand or a fire extinguishing agent. If the sand or the digestive agent is filled, it is possible to prevent the hydraulic oil discharged in the storage tank from being ignited in the storage tank.

DESCRIPTION OF SYMBOLS 1 Conshield door closer 2 Mounting plate 3 Door 4 Door closer body 5 Housing 5a First chamber 5b Second chamber 6 Rotating shaft 6A Screw hole (hydraulic oil discharge passage)
6B communication hole (hydraulic oil discharge passage)
6C Screw hole (hydraulic oil discharge path)
6a upper end 6b lower end 7 arm 8 door frame
9 Rail 10 Plug 11 Plug 12 Piston 12a Cavity 13 Coil Spring 14 Coil Spring 15 First Passage 16 Second Passage 16A Check Valve 17 Flow Control Passage 18 Speed Control Valve 19 Rack and Pinion Mechanism 20 Rack 21 Pinion 22 Bearing 23 O Ring 24 Bush 25 Storage tank 25A Body 25B Plug 25C Communication hole 26 Resin screw (resin member)
27 shaft 28 thermal expansion fireproof sheet

Claims (3)

A housing that is installed inside the door via a mounting plate and has a sealed space filled with hydraulic oil, a rotating shaft that vertically penetrates the housing, and an arm that rotates the rotating shaft when the door is opened and closed In a conshielded door closer having
A hydraulic oil discharge passage for discharging hydraulic oil from the sealed space when the housing becomes hot and a storage tank for storing the hydraulic oil discharged from the hydraulic oil discharge passage to the outside of the housing are provided. The concealed door closer is closed by a resin member.   The concealed door closer according to claim 1, wherein the hydraulic oil discharge passage is formed inside the rotating shaft.   The concealed door closer according to claim 1 or 2, wherein a communication hole is formed in the upper part of the storage tank to communicate the internal space in the storage tank with the outside.

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