JP2009180036A - Door closer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the operating oil in a housing from attaching on a door heated to a high temperature. <P>SOLUTION: The housing 4 is provided with a cover member 3. The cover member 3 comprises a pair of cover side-face walls 43 covering the whole both side-face walls 11 of the housing 4 and the sides of a lower end of a rotary shaft vertically penetrating the housing 4, a cover lower-face wall 42 joined to lower end edges of the two cover side-face walls 43 and correspondingly positioned under the lower end of the rotary shaft in a manner of covering a whole lower-face wall 10 of the housing 4, and a cover rear-face wall 40 joined to each of end edges of the cover lower-face wall 42 and two cover side-face walls 43 on the side of a door 104 and positioned between the lower end of the rotary shaft and the door 104. <P>COPYRIGHT: (C)2009,JPO&INPIT

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. As a result, the pinton moves in the sealed space of the housing to compress the coil spring, and when 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 Unexamined Patent Publication No. 2006-348652 (paragraph 0019 column to paragraph 0021 column, FIG. 3)

  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.

  In order to achieve the above object, the present invention is characterized in that the hydraulic oil discharged from the inside of the housing is prevented from adhering to the door, or the hydraulic oil is not discharged from the inside of the housing.

  Specifically, the present invention includes 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 urged by a piston urging means, and the piston. A built-in rack and pinion mechanism, a rotation shaft connected integrally to the pinion of the rack and pinion mechanism so as to penetrate the housing up and down, and one end connected to the upper end of the rotation shaft; A link mechanism with the other end connected to the upper frame side of the door opening of the building and the side wall of the housing are inserted, and the flow rate of hydraulic fluid flowing in the sealed space is controlled in conjunction with the movement of the piston And a speed adjusting valve that adjusts the closing speed of the door, and the rotational movement of the door is controlled by the opening operation of the door through the link mechanism, the rotating shaft, and the rack and pinion mechanism. The piston is moved in the sealed space of the housing against the biasing force of the piston biasing means by converting, and the piston is moved in the sealed space of the housing by the biasing force of the piston biasing means by releasing the hand from the door. Assuming a door closer configured to move and close the door slowly and automatically, the following solutions were taken.

  That is, in the first aspect of the invention, the housing is connected to a pair of cover side walls covering the entire side walls of the housing and the lower end side of the rotating shaft, and lower end edges of the cover side walls. A cover lower surface wall corresponding to a position lower than the lower end of the rotating shaft and covering the entire lower surface wall of the housing; and a door side edge of each of the cover lower surface wall and both cover side walls, A cover member including a cover back wall located between the lower end of the rotating shaft and the door is provided.

  According to a second aspect of the present invention, in the first aspect of the present invention, the cover member is connected to an edge on the opposite door side of each of the cover lower surface wall and the both cover side walls, and at least the rotating shaft. A cover front wall that covers the lower end of the housing from the front of the housing is provided, and an oil reservoir is formed in the lower end region.

  According to a third aspect of the present invention, in the above premise, in the region extending from the periphery of the upper end of the rotating shaft to the front wall of the upper surface wall of the housing, the hydraulic oil overflowing from the upper end of the rotating shaft is separated from the door. A guiding groove is formed to guide to the surface.

  According to a fourth aspect of the present invention, in the above premise, the hydraulic oil overflowing from the insertion position of the speed control valve is guided to at least one of the front wall and the lower end of the side wall on the side wall of the housing. A guide groove is formed.

  According to a fifth aspect of the present invention, in the above premise, the housing is provided with a storage tank for storing hydraulic oil, and the storage tank shuts off the sealed space and the storage tank during normal times, When the internal pressure of the hydraulic oil in the sealed space exceeds a predetermined value, the sealed space and the storage tank are connected to allow a part of the hydraulic oil to flow out of the sealed space into the storage tank for storage. A pressure reducing means for lowering the internal pressure is provided.

  According to a sixth aspect of the invention, in the fifth aspect of the invention, the pressure reducing means is a check valve.

  According to a seventh aspect of the present invention, in the fifth aspect of the present invention, the step-down means is provided so as to be linearly movable within the storage tank, and a blocking pin whose base end side projects out of the storage tank, and the blocking pin A blocking pin urging means for urging the blocking pin in a direction away from the sealed space; and, in normal times, the base end of the blocking pin is connected to the storage tank, and the blocking pin is resistant to the urging force of the blocking pin urging means. The closed space and the storage tank are shut off while being held in a state of being moved to the closed space side, and when an abnormality occurs, the blocking pin is attached to the blocking pin urging means by fusing at the ambient temperature around the door. It is characterized by comprising a connecting band that moves in a direction away from the sealed space by force to communicate the sealed space with the storage tank.

  According to the first aspect of the present invention, the lower end of the rotating shaft is covered from below with the cover lower surface wall so that the lower end of the rotating shaft is not exposed to the outside of the cover member, and the cover rear wall is connected to the lower end of the rotating shaft. While standing between the door and the cover, the cover bottom wall and the cover back wall are connected by a cover side wall. Therefore, even if the temperature of the door becomes high due to some reason and the internal pressure of the hydraulic oil inside the housing (sealed space) rises, and the hydraulic oil overflows from the part joints and around the rotating shaft, the overflowing hydraulic oil It is blocked by the cover lower wall, the cover rear wall, and the cover side wall, so that it does not adhere to the hot door and ignition is suppressed. Further, when the speed adjustment valve is made of resin, even if the speed adjustment valve melts with heat and the hydraulic oil is blown out from the location, the blown out hydraulic oil remains on the cover bottom wall, the cover back wall, and the cover side wall. It is blocked and does not adhere to the hot door, preventing fire.

  According to the invention which concerns on Claim 2, the hydraulic oil which came out of the inside of a housing is stored by the oil reservoir, and does not scatter on the floor of a building, and the ignition by adhesion to the door which became high temperature is suppressed further.

  According to the third aspect of the invention, since the hydraulic oil overflowing from the periphery of the upper end of the rotating shaft flows into the guide groove and is guided away from the door, it does not adhere to the hot door and is ignited. It is suppressed.

  According to the fourth aspect of the present invention, since the hydraulic oil overflowing from the insertion position of the speed adjustment valve flows into the guide groove and is guided to at least one of the lower end of the front wall and the side wall, the temperature becomes high. It does not adhere to the door and ignition is suppressed.

  According to the fifth aspect of the present invention, when the internal pressure of the hydraulic oil inside the housing (sealed space) exceeds a predetermined value, the pressure-lowering means is actuated so that the inside of the housing and the storage tank communicate with each other. A part flows out into the storage tank and is stored, and the internal pressure of the hydraulic oil inside the housing drops. Therefore, the hydraulic oil does not overflow from the parts connection part, the rotating shaft and the like, and the fire suppression due to the adhesion to the door which has become high temperature is ensured.

  According to the sixth aspect of the present invention, when the internal pressure of the hydraulic oil inside the housing (sealed space) exceeds a predetermined value, the check valve is pushed by the hydraulic oil to leave the valve seat, and the housing and the storage tank are separated from each other. In communication, part of the hydraulic oil flows out of the housing into the storage tank and is stored, and the internal pressure of the hydraulic oil inside the housing drops. The check valve is automatically returned to its original position by the lowering of the internal pressure of the hydraulic oil and is seated on the valve seat, so that the inside of the housing and the storage tank are shut off.

  According to the seventh aspect of the present invention, when the internal pressure of the hydraulic oil inside the housing (sealed space) exceeds a predetermined value, the connecting band is melted at the ambient temperature around the door, and the blocking pin is attached to the blocking pin urging means. The housing moves in a direction away from the inside of the housing due to the force, and the inside of the housing communicates with the storage tank. A part of the hydraulic oil flows out of the housing into the storage tank and is stored, and the internal pressure of the hydraulic oil inside the housing drops.

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

(Embodiment 1)
1-3 and FIG. 8, 101 shows the door opening part of a building, and this door opening part 101 is enclosed by the rectangle with the upper frame 102, a pair of left and right eaves frame 103, and a lower frame (not shown). The door 104 is attached to 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 according to the first embodiment of the present invention.

  The door closer 1 is a left-open (left-handed) parallel type, and includes a door closer body 2 and a cover member 3 that is a feature of the first embodiment. 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 includes a heat insulating plate 5 as shown in FIGS. And it is attached to the upper end of the door 104 through the mounting bracket 6.

  As shown in FIG. 10, the heat insulating plate 5 is formed in a rectangular plate shape such as bakelite or asbestos, and has two screw insertion holes 5a for attaching the mounting bracket 6 near the left and right ends. The screw holes 5b for attaching the cover member 3 are formed one by one on the left and right side end faces. Further, a cutout portion 5c is cut out at the lower end edge of the heat insulating plate 5 over the entire length.

  As shown in FIG. 7, the mounting bracket 6 has a U-shaped hook portion 6a formed at one end (the left end in FIG. 7), and a mounting piece portion 6b raised obliquely at the other end (the right end in FIG. 7). The mounting piece 6b is formed with two screw holes 6c for attaching the housing 4 in the vertical direction (see FIG. 9). Further, two screw insertion holes 6 d are formed in the upper and lower portions of the mounting bracket 6 so as to correspond to the screw insertion holes 5 a of the heat insulating plate 5.

  The housing 4 is formed in a rectangular parallelepiped shape with six surfaces of a front wall 7, a rear wall 8, an upper surface wall 9, a lower surface wall 10, and a pair of left and right side walls 11, and on the side of the rear wall 8, the upper surface wall 9, the lower surface A recessed portion 12 surrounded by the wall 10 and the left and right side walls 11 is formed. Further, a latch pin 13 is disposed on one end side (left end side in FIG. 7) of the recessed portion 12 so as to be bridged up and down by the upper surface wall 9 and the lower surface wall 10. Furthermore, two screw insertion holes 11a are vertically formed through the one side wall 11 (right side in FIG. 7) (see FIG. 9).

  In order to attach the door closer body 2 to the inside of the upper end of the door 104, as shown in FIGS. 7 to 9, first, the mounting bracket 6 is placed on the heat insulating plate 5 and placed on the upper end of the door 104, and the screw 14 is attached. By inserting the four screw insertion holes 6 d of the metal fitting 6 and the four screw insertion holes 5 a of the heat insulating plate 5 into the mounting plate 106 inside the door 104, the heat insulating plate 5 and the attachment metal fitting 6 are attached to the upper end of the door 104. Install.

  Next, the door closer body 2 is disposed in front of the mounting bracket 6, the hook 6 a of the mounting bracket 6 is hooked on the latch pin 13 of the housing 4, and the mounting bracket 6 is disposed in the recessed portion 12 of the housing 4. From this state, by screwing the screws 15 into the two screw insertion holes 11 a of the housing 4 and the two screw holes 6 c of the mounting bracket 6, the door closer main body 2 is connected to the door via the heat insulating plate 5 and the mounting bracket 6. 104 is attached to the upper end.

  In the housing 4 (sealed space 4a), as shown in FIG. 4, the piston 16 reciprocates in a state where it is urged to the left in FIG. 4 by the spring force of the first coil spring 17 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 16. In FIG. 4, reference numeral 18 denotes an end plug that is fitted into the fitting hole 11 b of the side wall 11.

  A hollow portion 16a is formed inside the piston 16, and the hollow portion 16a communicates with the high pressure chamber 2a through a first passage 19 and communicates with the low pressure chamber 2b through a second passage 20. is doing. The first passage 19 is provided with a first check valve 21. When the door is closed, the first passage 21 is pressed against the valve seat by the internal pressure of the hydraulic oil on the high pressure chamber 2a side. 19 is closed so that the hydraulic oil on the high pressure chamber 2a side does not flow into the low pressure chamber 2b side.

  A rack and pinion mechanism 22 is incorporated in the cavity 16 a of the piston 16. The rack and pinion mechanism 22 includes a rack 23 formed on the inner wall of the hollow portion 16a and a pinion 24 that meshes with the rack 23. The pinion 24 includes a rotating shaft 25 as shown in FIG. Are integrally connected to the housing 4 so as to penetrate the housing 4 vertically. In FIG. 5, 26 is a bearing arranged on the outer periphery of the upper end 25a side and the lower end 25b side of the rotary shaft 25, 27 is an O-ring arranged on the outer side of the bearing 26 in the axial direction of the rotary shaft 25, and 28 are these A bush 29 containing the bearing 26 and the O-ring 27 is a cylindrical cup that covers the lower end 25 b of the rotating shaft 25.

  One end of the link mechanism 30 is connected to the upper end 25a of the rotating shaft 25, and the other end of the link mechanism 30 is connected to the upper frame 102 side of the door opening 101 of the building. Specifically, the link mechanism 30 includes a main arm 31 and a connecting arm 32, one end of the main arm 31 is connected to the upper end 25 a of the rotating shaft 25 by a shaft 33, and the other end of the main arm 31 is connected. The one end of the connecting arm 32 is rotatably connected around the shaft 34. On the other hand, the base end of the stay (triangular plate) 35 is attached to the upper frame 102 of the door opening 101 by screwing four screws 36 into the mounting plate 107 inside the upper frame 102 (FIGS. 1 and 3), the other end of the connecting arm 32 is connected to the tip of the stay 35 so as to be rotatable around a shaft 37.

  On the other side wall 11 of the housing 4 (left side in FIG. 7), three resin-made speed control valves 38 are inserted so that one is located on the upper side and two on the lower side outside the end plug 18. (See FIG. 6), the hydraulic fluid that faces the flow path (not shown) connecting the high pressure chamber 2a and the low pressure chamber 2b of the sealed space 4a and flows in the sealed space 4a in conjunction with the movement of the piston 16 The closing speed of the door 104 is adjusted by controlling the flow rate.

  When the door 104 is opened in the direction of the arrow X1 (counterclockwise) in FIGS. 1 and 4, the rotation operation is transmitted to the rotary shaft 25 via the link mechanism 30, and the rotary shaft 25 is shown in FIGS. 4 rotates in the direction of arrow X2 (clockwise). As a result, the pinion 24 rotates in the direction of the arrow X2 (clockwise) in FIGS. 1 and 4, and the piston 16 resists the spring force of the first coil spring 17 via the rack and pinion mechanism 22. While compressing the spring 17, it moves linearly in the sealed space 4a of the housing 4 in the arrow X3 direction (right direction) in FIG. As a result, the hydraulic oil in the low pressure chamber 2b moves through the second passage 20 and the cavity 16a to move the first check valve 21 to open the first passage 19, 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 first coil spring 17 is extended by the repulsive force, and the piston 16 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 19 is closed by the first check valve 21, the hydraulic oil in the high pressure chamber 2 a does not flow into the low pressure chamber 2 b through the first passage 19, and a flow path and a speed adjustment valve (not shown) are not shown. It flows into the low-pressure chamber 2b through 38. As a result, the pinion 24 rotates in the direction of arrow Y2 (counterclockwise) in FIGS. 1 and 4, and this rotational force is transmitted to the link mechanism 30, and the door 104 moves in the direction of arrow Y1 (clockwise in FIG. 1 and FIG. 4). ) Slowly and automatically closes.

  As shown in FIGS. 9 and 11, the cover member 3 has a rectangular parallelepiped shape with six surfaces including a cover front wall 39, a cover rear wall 40, a cover upper wall 41, a cover lower wall 42, and a pair of left and right cover side walls 43. Is formed.

  A U-shaped notch 41a is formed at a position corresponding to the rotation shaft 25 of the cover upper surface wall 41 by cutting away from the edge on the door 104 side in order to avoid interference with the upper end 25a of the rotation shaft 25. The cover upper surface wall 41 excluding the portion 41 a covers the upper surface wall 9 of the housing 4.

  Both the cover side walls 43 extend downward from both end edges of the cover upper surface wall 41 and cover the entire side wall 11 of the housing 4 and the side of the lower end 25 b of the rotating shaft 25 through the cup 29. In addition, screw insertion holes 43 a are formed through one by one so as to correspond to the screw holes 5 b of the heat insulating plate 5 near the upper ends of the cover side walls 43 on the cover rear wall 40 side.

  The cover lower wall 42 is connected to the lower edges of the cover side walls 43, and is positioned below the lower end 25b of the rotating shaft 25 (ie, below the cup 29). Covering.

  The cover rear wall 40 has a vertical dimension that is set substantially half of the cover front wall 39 and is connected to the door 104 side edge of each of the cover lower wall 42 and both cover side walls 43. The space between the upper edge and the cover upper surface wall 41 is open.

  The cover front wall 39 is connected to the edge of the cover lower surface wall 42 and both cover side walls 43 on the side opposite to the door 104, and the rotary shaft 25 via the entire front wall 7 of the housing 4 and the cup 29. Is covered from the front of the housing 4.

  As a result, the oil reservoir 44 is formed in the lower end region of the housing 4 surrounded by the cover front wall 39, the cover lower wall 42, the both cover side walls 43, and the cover rear wall 40.

  The cover member 3 configured as described above has the door closer body 2 mounted on the door 104 as described above, with the open portion above the cover rear wall 40 facing the front wall 7 of the housing 4 and the door closer body 2 placed above. The cover 45 is inserted into the cover member 3 from the open position, and the screw 45 is inserted into the screw insertion hole 43a on the cover back wall 40 side and screwed into the screw hole 5b of the heat insulating plate 5, thereby covering almost the entire door closer body 2. In this state, it can be attached to the door 104 side. In this attached state, the upper end edge of the cover back wall 40 is located between the lower end 25b of the rotating shaft 25 covered with the cup 29 and the door 104, and faces the notch 5c of the heat insulating plate 5, The oil reservoir 44 is not opened to the door 104 (see FIG. 3).

  Thus, in the first embodiment, the cup 29 covering the lower end 25b of the rotating shaft 25 is covered from below with the cover lower wall 42 so as not to be exposed to the outside of the cover member 3, and is accommodated in the cover member 3. The cover rear wall 40 is raised between the lower end 25b of the rotary shaft 25 covered with the cup 29 and the door 104, and the cover lower wall 42 and the cover rear wall 40 are connected to the cover side wall 43. It is connected with. Therefore, for some reason, the temperature of the door 104 becomes high, and the internal pressure of the hydraulic oil inside the housing 4 (sealed space 4a) increases, so that the hydraulic oil comes from the cup 29 and the like covering the end plug 18 and the lower end 25b of the rotary shaft 25. Even if it overflows, the overflowing hydraulic oil can be blocked by the cover lower wall 42, the cover rear wall 40, and the cover side wall 43 so that it does not adhere to the hot door 104, thus preventing ignition. Even if the resin speed adjustment valve 38 is melted by heat and the hydraulic fluid is blown out from the location, the blown hydraulic fluid is blocked by the cover lower wall 42, the cover rear wall 40 and the cover side wall 43, Firing can be suppressed so as not to adhere to the door 104.

  In addition, in the first embodiment, the hydraulic oil discharged from the inside of the housing 4 is accumulated in the oil reservoir 44 so as not to be scattered on the floor of the building, thereby further suppressing ignition due to adhesion to the door 104 that has become hot. Can do.

-Modification 1-
FIG. 12 is a view corresponding to FIG. 3 showing a modification of the cover member 3. In this modification, the shape of the oil reservoir 44 is different from that of the first embodiment. That is, the oil reservoir 44 of this modification is formed in a triangular shape with a right-angled cross section by tilting the cover lower surface wall 42 downward as it moves away from the door 104. In FIG. 12, reference numeral 46 denotes hydraulic oil that has exited from the inside of the housing 4 and accumulated in the oil reservoir 44.

  The rest of the configuration is the same as in the first embodiment, so the same components as those in the first embodiment are denoted by the same reference numerals and detailed description thereof is omitted.

  Therefore, in this modification, the same operational effects as those of the first embodiment can be achieved. In addition, in this modified example, since the hydraulic oil 46 in the oil reservoir 44 is sequentially stored from a place away from the door 104, the hydraulic oil 46 is less likely to be ignited than in the first embodiment.

-Modification 2-
FIG. 13 is a view corresponding to FIG. 10A showing a modified example of the heat insulating plate 5. In this modified example, a plurality of through holes 5d for heat dissipation are formed penetrating in the vertical direction. Therefore, there is an advantage that the housing 4 can be hardly affected by the heat of the door 104.

(Embodiment 2)
14 to 19 show the door closer 1 according to the second embodiment. In the second embodiment, the direction of the cover member 3 is set to be opposite to that of the first embodiment. Due to this, the procedure for attaching the door closer body 2 and the cover member 3 to the door 104 is different from that of the first embodiment.

  That is, as shown in FIGS. 18 and 19, the cover member 3 according to the second embodiment includes a cover front wall 39, a cover back wall 40, a cover upper wall 41, a cover lower wall 42, and a pair of left and right cover side walls 43. Although it is the same as Embodiment 1 regarding being formed in the shape of a rectangular parallelepiped on six sides, it differs in the following points.

  That is, a U-shaped notch 41a is formed at a position corresponding to the rotary shaft 25 of the cover upper surface wall 41 by cutting away from the edge on the side opposite to the door 104 in order to avoid interference with the upper end 25a of the rotary shaft 25. The cover upper surface wall 41 excluding the notch portion 41 a covers the upper surface wall 9 of the housing 4.

  Both the cover side walls 43 extend downward from both end edges of the cover upper surface wall 41 and cover the entire side wall 11 of the housing 4 and the side of the lower end 25 b of the rotating shaft 25 through the cup 29. Further, on the side of the cover rear wall 40 of the side walls 43 of both covers, a screw insertion hole 43b for attaching the housing 4 to the mounting bracket 6 corresponds to the screw hole 6c of the mounting bracket 6 and the screw insertion hole 11a of the housing 4. As shown in FIG.

  The cover lower wall 42 is connected to the lower edges of the cover side walls 43, and is positioned below the lower end 25 b of the rotating shaft 25 (ie, below the cup 29) so as to correspond to the lower wall 10 of the housing 4. Covers the whole.

  The cover back wall 40 is connected to the door 104 side edge of each of the cover lower wall 42 and both cover side walls 43, and the lower end of the rotary shaft 25 via the entire back wall 8 of the housing 4 and the cup 29. 25 b is covered from the back surface of the housing 4. Four screw insertion holes 40 a are formed through the cover rear wall 40 so as to correspond to the screw insertion holes 5 a of the heat insulating plate 5 and the screw insertion holes 6 d of the mounting bracket 6.

  The cover front wall 39 has a vertical dimension that is set to approximately half of the cover back wall 40 and is connected to the edges of the cover lower wall 42 and the cover side walls 43 on the opposite door 104 side. The space between the upper edge and the cover upper surface wall 41 is open.

  As a result, the oil reservoir 44 is formed in the lower end region of the housing 4 surrounded by the cover front wall 39, the cover lower wall 42, the both cover side walls 43, and the cover rear wall 40.

  As shown in FIGS. 17 and 18, the door closer body 2 and the cover member 3 are first attached to the door 104 in the order of the heat insulating plate 5, the cover member 3, and the mounting bracket 6. 14 is inserted into the four screw insertion holes 40 a of the cover back wall 40, the four screw insertion holes 6 d of the mounting bracket 6, and the four screw insertion holes 5 a of the heat insulating plate 5, to the mounting plate 106 inside the door 104. These are attached to the door 104 by screwing. Next, the door closer main body 2 is inserted into the cover member 3 from the opening portion of the cover front wall 39 of the cover member 3, and the screw 15 is inserted into the two screws on the side wall 11 of the housing 4 from the screw insertion hole 43 b of the cover side wall 43. The door closer body 2 is attached to the inside of the upper end of the door 104 via the heat insulating plate 5 and the attachment fitting 6 by being screwed into the two screw holes 6 c of the insertion hole 11 a and the attachment fitting 6. In this attached state, the front wall 7 of the housing 4 is exposed from the cover member 3 (see FIGS. 15 and 16).

  The rest of the configuration is the same as in the first embodiment, so the same components as those in the first embodiment are denoted by the same reference numerals and detailed description thereof is omitted.

  Therefore, in the second embodiment, the same operational effects as in the first embodiment can be achieved.

(Embodiment 3)
20 to 25 show the door closer 1 according to the third embodiment. In the third embodiment, the shape of the cover member 3 is different from that of the first embodiment. The procedure for attaching the door closer body 2 and the cover member 3 to the door 104 is the same as in the second embodiment.

  That is, as shown in FIGS. 24 and 25, the cover member 3 according to the third embodiment does not have the cover front wall 39 and the cover upper surface wall 41, but the cover rear wall 40, the cover lower wall 42, and the pair of left and right cover side walls. The entire surface of the housing 4 on the side opposite to the door 104 and the upper side are opened on the four surfaces 43.

  That is, the cover side walls 43 cover the sides of the lower end 25 b of the rotating shaft 25 through the entire side walls 11 of the housing 4 and the cup 29. Further, on the side of the cover rear wall 40 of the side walls 43 of both covers, a screw insertion hole 43b for attaching the housing 4 to the mounting bracket 6 corresponds to the screw hole 6c of the mounting bracket 6 and the screw insertion hole 11a of the housing 4. As shown in FIG.

  The cover lower wall 42 is connected to the lower edges of the cover side walls 43, and is positioned below the lower end 25 b of the rotating shaft 25 (ie, below the cup 29) so as to correspond to the lower wall 10 of the housing 4. While covering the whole, it is inclined downward as it gets away from the door 104 and extends to the side opposite to the door 104 from the side walls 43 of both covers.

  The cover back wall 40 is connected to the door 104 side edge of each of the cover lower wall 42 and both cover side walls 43, and the lower end of the rotary shaft 25 via the entire back wall 8 of the housing 4 and the cup 29. 25 b is covered from the back surface of the housing 4. Four screw insertion holes 40 a are formed through the cover rear wall 40 so as to correspond to the screw insertion holes 5 a of the heat insulating plate 5 and the screw insertion holes 6 d of the mounting bracket 6.

  Therefore, in this third embodiment, there is no oil reservoir 44 as in the first and second embodiments.

  The rest of the configuration is the same as in the first embodiment, so the same components as those in the first embodiment are denoted by the same reference numerals and detailed description thereof is omitted.

  Therefore, in this third embodiment, there is no effect of the oil reservoir 44 as in the first and second embodiments, but the hydraulic oil that has come out from the inside of the housing 4 can be dropped to a location far away from the door 104. Other than that, the same operational effects as those of the first embodiment can be achieved.

(Embodiment 4)
FIG. 26 is a transverse plan view showing an internal mechanism of the door closer body 2 of the door closer 1 according to the fourth embodiment. In the fourth embodiment, the heat insulating plate 5 is not provided, and the mounting bracket 6 is directly attached to the door 104. Instead, a gap 47 is provided between the door closer body 2 and the door 104 so that the door closer body 2 is not in contact with the door 104 so that heat from the door 104 is not easily transmitted.

  Note that the present invention can be applied to any cover member 3 regardless of the presence or absence of the cover member 3 as in the first to third embodiments. The same applies to the following fifth to seventh embodiments.

(Embodiment 5)
FIG. 27 is a perspective view of the door closer body 2 in the door closer 1 according to the fifth embodiment. In the fifth embodiment, in the region extending from the periphery of the upper end 25 a of the rotation shaft 25 to the front wall 7 in the upper surface wall 9 of the housing 4, the hydraulic oil overflowing from the periphery of the upper end 25 a of the rotation shaft 25 is away from the door 104. A first guide groove 48 that guides the rotary shaft 25 is formed by an annular groove 48a that surrounds the rotary shaft 25 and a linear groove 48b that extends downward from the annular groove 48a through the front wall 7.

  The side wall 11 of the housing 4 has a second guide groove 49 for guiding the hydraulic oil overflowing from the insertion position of the speed adjustment valve 38 to at least one of the front wall 7 and the lower end of the side wall 11. It is formed in an annular shape. In addition, two cutout portions 50 are formed in the edge of each of the front wall 7 and the upper surface wall 9, and three cutout portions 50 are formed in the edge of the lower wall 10. The second guide groove 49 is continuous with the notches 50.

  Therefore, in the fifth embodiment, the hydraulic oil overflowing from the periphery of the upper end 25a of the rotary shaft 25 flows into the first guide groove 48 and is guided away from the door 104, and the thermal effect of the door 104 that has reached a high temperature. Can reduce ignition and suppress ignition.

  In the fifth embodiment, the hydraulic oil overflowing from the insertion position of the speed adjustment valve 38 flows into the second guide groove 49 and is guided to the lower ends of the front wall 7 and the side wall 11 through the notch 50. Therefore, it does not adhere to the door 104 that has become high temperature, and ignition can be suppressed.

  Further, in the fifth embodiment, the cutout portions 50 are formed in the top wall 9 and the bottom wall 10, respectively, so that it can be applied to a right-opening (right-handed) type door 104 by turning left and right. It is convenient to be able to.

(Embodiment 6)
28 and 29 are cross-sectional plan views showing an internal mechanism of the door closer body 2 in the door closer 1 according to the sixth embodiment. In the sixth embodiment, a housing tank 51 for housing hydraulic oil is attached to the housing 4. Further, as in the fourth embodiment, the heat insulating plate 5 is not provided, and the door closer body 2 is attached to the door 104 via the mounting bracket 6, and a gap 47 is provided between the door closer body 2 and the door 104 to open the door closer body. 2 is made not to contact the door 104 so that heat from the door 104 is hardly transmitted, but the heat insulating plate 5 may be provided as in the first to third embodiments.

  Specifically, the storage tank 51 is fitted into the fitting hole 11 b of the side wall 11 instead of the end plug 18 on the low pressure chamber 2 b side of the housing 4. A cylindrical portion 51 a that communicates with the low-pressure chamber 2 b is integrally projected from the storage tank 51, and a second check valve 52 as a pressure-lowering means is urged against the second coil spring 53 in the cylindrical portion 51 a. The pin 54 is pressed against the valve seat 51b.

  The second check valve 52 shuts off the inside of the housing 4 (sealed space 4a) and the storage tank 51 during normal times. On the other hand, when the internal pressure of the hydraulic oil in the sealed space 4a exceeds the predetermined value, the second check valve 52 is pushed by the hydraulic oil and resists the spring force of the second coil spring 53 from the valve seat 51b. The inside of the housing 4 and the storage tank 51 are communicated with each other, a part of the hydraulic oil flows out of the housing 4 into the storage tank 51 and stored, and the internal pressure of the hydraulic oil inside the housing 4 is lowered. Due to the lowering of the internal pressure of the hydraulic oil, the second check valve 52 is automatically returned to the original position by the spring force of the second coil spring 53 and is seated on the valve seat 51b, so that the inside of the housing 4 and the storage tank 51 are shut off. It is like that.

  Therefore, in the sixth embodiment, the hydraulic oil does not overflow from the periphery of the end plug 18 and the rotation shaft 25, and the ignition suppression due to the adhesion to the door 104 that has become high can be ensured.

(Embodiment 7)
30 and 31 are cross-sectional plan views showing the internal mechanism of the door closer body 2 in the door closer 1 according to the seventh embodiment. In the seventh embodiment as well, a storage tank 51 for storing hydraulic oil is attached to the housing 4. Further, as in the fourth embodiment, the heat insulating plate 5 is not provided, and the door closer body 2 is attached to the door 104 via the mounting bracket 6, and a gap 47 is provided between the door closer body 2 and the door 104 to open the door closer body. 2 is made not to contact the door 104 so that heat from the door 104 is hardly transmitted, but the heat insulating plate 5 may be provided as in the first to third embodiments.

  Specifically, the storage tank 51 is fitted into the fitting hole 11 b of the side wall 11 instead of the end plug 18 on the low pressure chamber 2 b side of the housing 4. The storage tank 51 is integrally provided with a cylindrical portion 51a that communicates with the low pressure chamber 2b.

  The storage tank 51 is provided with a pressure reducing device 55 as a pressure reducing means. The step-down device 55 includes a blocking pin 56 provided so as to be linearly movable in the storage tank 51, a distal end of the blocking pin 56 is inserted into the cylindrical portion 51 a, and a proximal end is the storage tank 51. Protruding outside. A large-diameter portion 56 a is formed at the base end of the blocking pin 56, and a third coil spring 57 as a blocking pin urging means connects the blocking pin 56 between the large-diameter portion 56 a and the bottom surface of the storage tank 51. The blocking pin 56 is urged in a direction away from the sealed space 4 a by the spring force of the third coil spring 57. The large-diameter portion 56a of the blocking pin 56 and the bottom surface of the storage tank 51 are connected by a connecting band 58 made of a fuse or the like that is melted by heat. Reference numeral 59 denotes an O-ring provided on the outer periphery near the base end of the blocking pin 56 so that the hydraulic oil stored in the storage tank 51 does not leak to the outside.

  During normal times, the base end of the blocking pin 56 is connected to the storage tank 51 by a connecting band 58, and the blocking pin 56 is moved toward the sealed space 4a against the spring force of the third coil spring 57. The sealed space 4a and the storage tank 51 are shut off while maintaining the state. On the other hand, when the internal pressure of the hydraulic oil inside the housing 4 (sealed space 4a) exceeds a predetermined value, the connection band 58 is melted at the ambient temperature around the door 104 as shown in FIG. The distal end of the third coil spring 57 is moved away from the sealed space 4a by the spring force of the third coil spring 57 so as to be separated from the valve seat 51b, thereby allowing the housing 4 and the storage tank 51 to communicate with each other. A part of the hydraulic oil is stored in the storage tank 51 so that the internal pressure of the hydraulic oil in the housing 4 is lowered.

  Therefore, in the seventh embodiment, the hydraulic oil does not overflow from the periphery of the end plug 18, the rotation shaft 25, and the like, and it is possible to reliably suppress ignition due to adhesion to the door 104 that has become hot.

  In the first embodiment, the cover member 3 is attached to the heat insulating plate 5 with the screw 45. In the second and third embodiments, the cover member 3 is attached to the heat insulating plate 5 with the screw 14. Other attachment means such as a formula may be employed.

  Furthermore, in Embodiment 2 described above, another cover member may be provided in a portion where the front wall 7 of the housing 4 is exposed from the cover member 3 so that the front wall 7 of the housing 4 is not exposed. In the second embodiment, the screw insertion hole 43b of the cover member 3 (cover side wall 43) may be closed with a plug or the like after the cover member 3 is completely attached.

  Further, in each of the above embodiments, a heat insulating material may be accommodated in the recessed portion 12 on the back wall 8 side of the housing 4, and according to this, the internal pressure of the hydraulic oil inside the housing 4 is caused by the heat from the door 104. It is preferable that it can be prevented from rising.

  In addition, in the above-described Embodiments 6 and 7, the storage tank 51 is provided by being fitted into the fitting hole 11b of the side wall 11 instead of the end plug 18 on the low pressure chamber 2b side of the housing 4. However, the storage tank 51 may be attached to any position of the housing 4 so as to communicate with the inside of the housing 4 (sealed space 4a).

It is a top view of the state which attached the door closer which concerns on Embodiment 1 to the door. It is a front view in the AA line of FIG. It is a side view which shows the state which abbreviate | omitted the side wall of the cover member in the BB line of FIG. 1, and exposed the door closer main body. It is a cross-sectional top view which shows the internal mechanism of the door closer main body in the door closer which concerns on Embodiment 1. FIG. It is sectional drawing in the CC line of FIG. It is a side view in the DD line of FIG. FIG. 3 is an exploded plan view of the first embodiment before the door closer body and the cover member are attached to the door. It is a front view which shows the state which abbreviate | omitted the front wall of the cover member in FIG. 2, and exposed the door closer main body. It is a side view in the EE line of FIG. The heat insulation board in Embodiment 1 is shown, (a) is a top view, (b) is a front view, (c) is a side view. The cover member in Embodiment 1 is shown, (a) is a top view, (b) is a front view, (c) is a side view. FIG. 6 is a view corresponding to FIG. 3 illustrating a modification of the cover member in the first embodiment. FIG. 10A is a diagram corresponding to FIG. 10A illustrating a modification of the heat insulating plate in the first embodiment. FIG. 3 is a diagram corresponding to FIG. FIG. 3 is a diagram corresponding to FIG. 2 of the second embodiment. FIG. 4 is a diagram corresponding to FIG. 3 of the second embodiment. FIG. 8 is a diagram corresponding to FIG. 7 of the second embodiment. FIG. 10 is a diagram corresponding to FIG. 9 of the second embodiment. FIG. 12 is a view corresponding to FIG. 11 of the second embodiment. FIG. 6 is a view corresponding to FIG. 1 of Embodiment 3. FIG. 6 is a view corresponding to FIG. 2 of the third embodiment. FIG. 4 is a diagram corresponding to FIG. 3 of the third embodiment. FIG. 8 is a diagram corresponding to FIG. 7 of the third embodiment. FIG. 10 is a diagram corresponding to FIG. 9 of the third embodiment. FIG. 12 is a view corresponding to FIG. 11 of the third embodiment. FIG. 5 is a diagram corresponding to FIG. 4 of the fourth embodiment. FIG. 10 is a perspective view of a door closer body in a door closer according to a fifth embodiment. FIG. 7 is a diagram corresponding to FIG. It is the F section enlarged view of FIG. FIG. 9 is a diagram corresponding to FIG. It is the G section enlarged view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Door closer 3 Cover member 4 Housing 4a Sealed space 7 Front wall 9 Upper surface wall 10 Lower surface wall 11 Side wall 16 Piston 17 1st coil spring (piston biasing means)
22 Rack and pinion mechanism 23 Rack 24 Pinion 25 Rotating shaft 25a Rotating shaft upper end 25b Rotating shaft lower end 30 Link mechanism 38 Speed control valve 39 Cover front wall 40 Cover rear wall 42 Cover lower wall 43 Cover side wall 44 Oil reservoir 46 Hydraulic oil 48 First guide groove 49 Second guide groove 51 Storage tank 52 Second check valve (pressure reducing means)
55 Step-down device (Step-down means)
56 blocking pin 57 third coil spring (blocking pin biasing means)
58 connecting band 101 door opening 102 upper frame

Claims (7)

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 adjusting 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 that flows 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 urging force of the piston urging means by releasing the hand from the door, and to close the door slowly and automatically,
The housing includes a pair of cover side walls covering the entire side walls of the housing and the lower side of the rotating shaft,
A cover lower surface wall connected to the lower end edges of the side walls of both covers and corresponding to a position below the lower end of the rotating shaft and covering the entire lower surface wall of the housing;
A cover member is provided that is connected to the door side edge of each of the cover lower wall and the cover side walls, and includes at least a cover rear wall positioned between the lower end of the rotating shaft and the door. A door closer. The door closer according to claim 1,
The cover member includes a cover front wall that is connected to an edge of each of the cover lower wall and the side walls of the covers on the side opposite to the door and covers at least the lower end of the rotating shaft from the front of the housing. A door closer characterized in that a reservoir is formed. 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 adjusting 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 that flows 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 urging force of the piston urging means by releasing the hand from the door, and to close the door slowly and automatically,
A guide groove that guides hydraulic oil overflowing from the periphery of the rotating shaft in a direction away from the door is formed in a region extending from the upper end of the rotating shaft to the front wall of the upper surface wall of the housing. Door closer. A housing having a sealed space filled with hydraulic oil;
A piston arranged to be able to reciprocate in a state where the piston is biased by the biasing means in the sealed space;
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 adjusting 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 that flows 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 urging force of the piston urging means by releasing the hand from the door, and to close the door slowly and automatically,
A door closer characterized in that a guide groove for guiding hydraulic oil overflowing from the insertion position of the speed control valve to at least one of the front wall and the lower end of the side wall is formed on the side wall of the housing. . 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 adjusting 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 that flows 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 urging force of the piston urging means by releasing the hand from the door, and to close the door slowly and automatically,
The housing is provided with a storage tank for storing hydraulic oil,
The storage tank is closed between the sealed space and the storage tank during normal times, but when the internal pressure of the hydraulic oil in the sealed space exceeds a predetermined value, the sealed space is connected to the storage tank to establish a sealed space. The door closer is provided with a pressure-lowering means for allowing a part of the hydraulic oil to flow out into the storage tank and storing the hydraulic oil and lowering the internal pressure of the hydraulic oil in the sealed space. The door closer according to claim 5,
The door closer is characterized in that the pressure reducing means is a check valve. The door closer according to claim 5,
The pressure-lowering means is provided so as to be linearly movable in the storage tank, and a blocking pin whose proximal end projects out of the storage tank;
Blocking pin biasing means for biasing the blocking pin in a direction away from the sealed space;
During normal times, the base end of the blocking pin is connected to the storage tank, and the blocking pin is moved to the sealed space side against the urging force of the blocking pin urging means. While shutting off the storage tank, in the event of an abnormality, the sealing pin is melted at the ambient temperature around the door and the blocking pin is moved away from the sealed space by the biasing force of the blocking pin biasing means. A door closer comprising a connecting band for communicating with each other.

Images