Door closer connection structure

Abstract

To provide a door closer connection structure capable of suppressing damage to a metal upper frame material and firmly fixing a door closer to the upper frame.SOLUTION: A connection structure of a door closer 6 in which a metal upper frame material 23 includes a metal frame body 251 and an upper frame connection part 266, and in which a resin upper frame material 24 includes a cylinder part 241 whose upper part is formed at its portion with a cutout part 244; a back plate 4 is such that its back plate fixing portion 41 is fixed to the metal frame main body 251 in a state where no gap is formed between a lower surface of the back plate connecting portion 44 and an upper surface of an upper frame coupling portion 266; a reinforcing member 5 is disposed in a tubular portion 241 in a state where an upper contact portion 52 exposed through the cutout portion 244 is in contact with the lower surface of the upper frame coupling portion 266 and a lower contact portion 51 is in contact with an inner peripheral surface of the tubular portion 241; the door closer 6 is connected to the upper frame 21 by fixing a screw 16 inserted through the cylindrical portion 241, the reinforcing member 5, and the upper frame connecting portion 266 to the back plate connecting portion 44.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a connection structure of a door closer.

Background Art

[0002] Conventionally, a connection structure of a door closer for connecting a door frame of a building and a door has been known (see, for example, Patent Document 1). In the configuration described in Patent Document 1, the upper frame of the door frame includes a frame body having a hollow cross section and an interior portion extending from the interior surface of the frame body to the interior side. An interior contact surface extending upward is provided at the interior side end of the interior portion. A door closer mounting bracket is attached to the upper frame. The door closer mounting bracket is formed in a substantially L-shaped cross section including a fixing portion fixed to the interior side of the frame body with screws and a portion (hereinafter referred to as "opposing portion") that faces the interior portion at a predetermined interval and abuts against the tip of the interior contact surface. A resin upper frame that covers a substantially L-shaped surface including the lower end portion of the interior surface of the frame body and the lower surface of the interior portion is attached to the upper frame. An intermediate bracket having a substantially square cross section is disposed in a space formed by the frame body, the interior portion, and the resin upper frame. The intermediate bracket is fixed to the door closer mounting bracket by screws inserted through its upper surface portion and the interior portion and screwed into the opposing portion of the door closer mounting bracket. The door closer is fixed to the intermediate bracket by screws inserted through its fixing portion and the resin upper frame and screwed into the lower surface portion of the intermediate bracket.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the mounting structure as described in Patent Document 1, since there is a space between the door closer mounting bracket and the interior of the upper frame, there is a risk that the interior of the upper frame may be damaged by the load from the door closer, or that the screws fixing the door closer mounting bracket and the intermediate bracket may become loose.

[0005] An object of the present invention is to provide a connection structure for a door closer that can suppress damage to a metal upper frame member and firmly fix the door closer to the upper frame.

Means for Solving the Problems

[0006] The connection structure of the door closer of the present invention is a connection structure of a door closer that is fixed to the indoor side of a door that is openably and closably mounted in a door frame and is connected to the upper frame of the door frame using a back plate, a reinforcing member, and a door closer fixing tool. The upper frame includes a metal upper frame member and a resin upper frame member attached to the metal upper frame member. The metal upper frame member includes a metal frame main body and an upper frame connection portion extending from the metal frame main body toward the indoor side. The resin upper frame member is located below the upper frame connection portion and includes a cylindrical portion having a cut-out portion formed in a part of its upper portion. The back plate includes a back plate fixing portion and a plate-shaped back plate connection portion. The back plate fixing portion is fixed to the metal frame main body in a state where no gap is formed between the lower surface of the back plate connection portion and the upper surface of the upper frame connection portion. The reinforcing member includes an upper contact portion and a lower contact portion. The upper contact portion exposed through the cut-out portion contacts the lower surface of the upper frame connection portion, and the lower contact portion contacts the inner peripheral surface of the cylindrical portion. The door closer is connected to the upper frame by fixing the door closer fixing tool inserted through the cylindrical portion, the reinforcing member, and the upper frame connection portion to the back plate connection portion.

Effects of the Invention

[0007] According to the present invention, it is possible to provide a connection structure for a door closer that can suppress damage to a metal upper frame member and firmly fix the door closer to the upper frame.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Mode for Carrying Out the Invention

[0009] [Embodiment] Hereinafter, embodiments of the present invention will be described with reference to the drawings. The single-opening door 1 which is a fitting shown in FIG. 1 includes a door frame 2 which is a fitting frame attached to an opening of a building body, a door 3 which is attached to be openable and closable within this door frame 2, and a door closer 6 which is connected to the door frame 2 and the door 3 using a back plate 4 and a reinforcement material 5. In the following description, the left-right direction of the single-opening door 1 is the X-axis direction (for example, refer to FIG. 4(A)), the up-down direction of the single-opening door 1 is the Y-axis direction, and the prospective direction of the single-opening door 1 is the Z-axis direction. The X, Y, and Z-axis directions are orthogonal to each other.

[0010] The door frame 2 is a square frame formed by joining an upper frame 21, a lower frame 22, a suspension vertical frame (not shown) and a door tip vertical frame in a square frame shape. The door 3 is attached to the suspension vertical frame. The upper frame 21 is composed of a metal upper frame member 23 and a resin upper frame member 24 attached to the metal upper frame member 23. The metal upper frame member 23 is a heat-insulating frame member composed of an outdoor upper profile member 25 and an indoor upper profile member 26 each formed of an aluminum extrusion profile, and a heat-insulating material 27 connecting the outdoor upper profile member 25 and the indoor upper profile member 26. The resin upper frame member 24 includes a cylindrical portion 241 where the reinforcing member 5 is disposed, and a tight material mounting portion 242 where the tight material 11 is mounted. The resin upper frame member 24 is fixed to the indoor upper profile member 26 by a plurality of screws 13. The lower frame 22 is composed of a metal lower frame member 28 and a resin lower frame member 29 attached to the metal lower frame member 28. The metal lower frame member 28 includes a tight material mounting portion 281 where the tight material 12 is mounted so as to be positioned directly below the tight material 11.

[0011] The back plate 4 is disposed above the indoor upper profile member 26. The back plate 4 is fixed to the side of the hanging element vertical frame in the outdoor upper profile member 25 by a plurality of screws 14.

[0012] The reinforcing member 5 is disposed below the back plate 4 and the indoor upper profile member 26 and inside the cylindrical portion 241 of the resin upper frame member 24. The reinforcing member 5 is fixed to the indoor upper profile member 26 by screws 15 as two reinforcing member fixing tools.

[0013] The door closer 6 includes a closer body 61 fixed to the upper part on the indoor side of the door 3, and a link mechanism 62 that connects the closer body 61 and the upper frame 21. The closer body 61 is provided with a rotating shaft 611 protruding upward. The link mechanism 62 includes a first arm 621 whose one end is rotatably connected to the rotating shaft 611, a second arm 622 whose one end is rotatably connected to the other end of the first arm 621, and a bracket 623 whose one end is rotatably connected to the other end of the second arm 622. The bracket 623 is fixed to the indoor upper profile member 26 by screws 16 as four door closer fixing tools.

[0014] As shown in FIG. 2, the outdoor upper profile member 25 constituting the upper frame 21 includes a metal frame body 251 formed in a substantially rectangular shape having a hollow portion along the X-axis direction. The metal frame body 251 is composed of an outdoor finding surface portion 251A and an indoor finding surface portion 251B along the Y-axis direction, and prospective surface portions 251C and 251D along the Z-axis direction continuous with the outdoor finding surface portion 251A and the indoor finding surface portion 251B. The indoor finding surface portion 251B is located on the lower end side thereof, and is composed of an outdoor connecting portion 252 with an opening on the indoor side and a back plate mounting portion 253 located above the outdoor connecting portion 252.

[0015] As shown in FIGS. 2 and 3, the indoor upper profile 26 includes a bottom surface portion 261 along the Z-axis direction and a metal frame member fixing portion 262 extending upward from the indoor-side end of the bottom surface portion 261. An indoor connecting portion 263 with an opening on the outdoor side is provided at the outdoor-side end of the bottom surface portion 261. An engaging piece 264 extending downward and a protrusion 265 protruding upward are provided at the center of the bottom surface portion 261 in the Z-axis direction. An engaging claw portion 264A is provided at the lower end of the engaging piece 264. The portion between the metal frame member fixing portion 262 and the protrusion 265 on the bottom surface portion 261 constitutes a plate-shaped upper frame connecting portion 266.

[0016] The heat insulating material 27 is provided so that a part of it is located inside the outdoor connecting portion 252 and the indoor connecting portion 263, thereby connecting the outdoor upper profile 25 and the indoor upper profile 26.

[0017] The cylindrical portion 241 of the resin upper frame member 24 has a hollow portion along the X-axis direction, and includes a bottom surface portion 241A along the Z-axis direction, an indoor finding surface portion 241B that extends upward from the indoor-side end of the bottom surface portion 241A, an indoor upper surface portion 241C that extends outward from the upper end of the indoor finding surface portion 241B, an intermediate finding surface portion 241D that extends downward from the outdoor-side end of the indoor upper surface portion 241C, an outdoor upper surface portion 241E that extends outward from the lower end of the intermediate finding surface portion 241D, and an outdoor finding surface portion 241F that extends downward from the outdoor-side end of the outdoor upper surface portion 241E and is connected to the outdoor-side end of the bottom surface portion 241A. A cutout portion 244 indicated by hatching (diagonal lines) in FIG. 3 is provided in the portion of the cylindrical portion 241 where the reinforcing member 5 is disposed. The cutout portion 244 is formed by removing only a part of the indoor upper surface portion 241C, the intermediate finding surface portion 241D, and the outdoor upper surface portion 241E in the X-axis direction, and leaving the remaining portions. The tight material mounting portion 242 of the resin upper frame member 24 includes a mounting lower portion 242A that extends outward from the outdoor-side end of the bottom surface portion 241A of the cylindrical portion 241 and then bends upward, the outdoor finding surface portion 241F, an upper bottom portion 242B that extends upward from the upper end of the outdoor finding surface portion 241F, and a mounting upper portion 242C that extends outward from the upper end of the upper bottom portion 242B and then bends downward, and is configured such that the indoor side is open. A tight material 11 is mounted in the opening of the tight material mounting portion 242. An engaging protrusion 245 that protrudes inward and engages with the engaging claw portion 264A of the engaging piece 264 is provided on the upper bottom portion 242B. The resin upper frame member 24 includes a resin frame member fixing portion 243 provided so as to extend upward from the upper end of the indoor finding surface portion 241B of the cylindrical portion 241. A hook portion 243A that protrudes outward is provided at the upper end of the resin frame member fixing portion 243. The resin upper frame member 24 is attached to the indoor upper-shaped member 26 so as to cover the indoor-side surface and the lower surface of the indoor upper-shaped member 26 by engaging the engaging protrusion 245 with the engaging claw portion 264A of the indoor upper-shaped member 26 and screwing a screw 13 inserted through the resin frame member fixing portion 243 into the metal frame member fixing portion 262 of the indoor upper-shaped member 26.

[0018] The back plate 4 is formed by bending a metal plate. The back plate 4 includes a back plate fixing portion 41 along the Z-axis direction, a first intermediate portion 42 extending from the lower end of the back plate fixing portion 41 toward the indoor side, a second intermediate portion 43 extending downward from the indoor-side end of the first intermediate portion 42, and a back plate connecting portion 44 extending from the lower end of the second intermediate portion 43 toward the outdoor side. The back plate 4 is fixed to the outdoor upper profile 25 by a screw 14 inserted through the screw insertion hole 411 of the back plate fixing portion 41 and screwed into the female screw portion 253A of the back plate mounting portion 253, so that no gap is formed between the back plate connecting portion 44 and the upper frame connecting portion 266 with the airtight material 7 sandwiched therebetween. As shown in FIG. 2, the airtight material 7 has a certain thickness, but it becomes thinner when sandwiched between the back plate connecting portion 44 and the upper frame connecting portion 266, so it is not shown in FIGS. 1 and 3.

[0019] The reinforcing member 5 is attached to the side of the hanging vertical frame in the upper frame 21. The reinforcing member 5 is formed by bending a metal plate. As shown in FIGS. 4(A) to 4(C), it has a rectangular plate-shaped lower contact portion 51 whose longitudinal direction is parallel to the X-axis direction and whose short-side direction is parallel to the Z-axis direction, a pair of upper contact portions 52 extending upward along the Y-axis direction from both side edges in the short-side direction of the lower contact portion 51, a pair of connecting portions 53 extending upward along the Y-axis direction from both side edges in the longitudinal direction of the lower contact portion 51, and a pair of reinforcing member fixing portions 54 extending away from each other along the X-axis direction from the upper ends of the respective connecting portions 53. With such a configuration, the reinforcing member 5 can be easily manufactured, and the weight of the reinforcing member 5 can also be reduced. Four screw insertion holes 511 arranged in the X-axis direction are formed in the lower contact portion 51. One screw insertion hole 541 is formed in each reinforcing member fixing portion 54. The reinforcing member 5 is fixed to the indoor upper profile 26 by a screw 15 inserted through the screw insertion hole 541 and screwed into the female screw portion 266A of the upper frame connecting portion 266, so that the upper end surface of the upper contact portion 52 is in surface contact with the lower surface of the upper frame connecting portion 266 and the lower surface of the lower contact portion 51 is in surface contact with the upper surface of the bottom portion 241A within the cylindrical portion 241 of the resin upper frame member 24. Thus, since the lower surface, which is the main surface of the plate-shaped lower contact portion 51, is in surface contact with the upper surface (inner peripheral surface of the cylindrical portion 241) of the bottom surface portion 241A, the contact area between the lower contact portion 51 and the cylindrical portion 241 can be increased, and deformation of the cylindrical portion 241 can be suppressed.

[0020] The door closer 6 is fixed to the back plate 4 in a state where the bracket 623 is in surface contact with the lower surface of the resin upper frame member 24 by screws 16 inserted through the screw insertion holes 623A of the bracket 623, the screw insertion holes 241G of the resin upper frame member 24, the screw insertion holes 511 of the reinforcing member 5, and the screw insertion holes 266B of the upper frame connecting portion 266 and screwed into the female screw portion 441 of the back plate connecting portion 44.

[0021] Next, a method for connecting the door closer 6 to the upper frame 21 of the door frame 2 will be described. As shown in FIG. 2, prepare a back plate 4, a reinforcing member 5, a door closer 6, an airtight material 7, screws 13, 14, 15, 16, a resin upper frame member 24, and an outdoor upper profile member 25. Next, as shown by the two-dot chain line, with the airtight material 7 sandwiched between the back plate connecting portion 44 and the upper frame connecting portion 266, the back plate 4 is fixed to the outdoor upper profile member 25 with a plurality of screws 14. By providing the airtight material 7 in this way, it is possible to suppress the entry of outside air into the room through the screw insertion hole 266B of the upper frame connecting portion 266 and the female screw portion 441 of the back plate connecting portion 44. After that, the reinforcing member 5 is fixed to the indoor upper profile member 26 with two screws 15. In this way, by fixing the reinforcing member 5 to the indoor upper profile member 26, the subsequent work can be carried out by releasing the hand from the reinforcing member 5, and the workability is improved. Next, the reinforcing member 5 is disposed in the cylindrical portion 241 through the cutout portion 244, the engaging protrusion portion 245 is engaged with the engaging claw portion 264A of the outdoor upper profile member 25, and the hooking portion 243A is hooked on the upper end of the metal frame member fixing portion 262, whereby the resin upper frame member 24 is temporarily fixed to the outdoor upper profile member 25. Then, the resin upper frame member 24 is fixedly secured to the outdoor upper profile member 25 with a plurality of screws 13. Finally, the door closer 6 is fixed to the back plate 4 with a plurality of screws 16, whereby the door closer 6 is connected to the upper frame 21.

[0022] According to the above embodiment, since the door closer 6 is connected to the upper frame 21 in a state where no gap is formed between the lower surface, which is the main surface of the plate-shaped back plate connecting portion 44, and the upper surface of the upper frame connecting portion 266, it is possible to suppress damage to the upper frame connecting portion 266 due to the load from the door closer 6 or loosening of the fixing by the screw 16. Further, since the cutting portion 244 for exposing the upper contact portion 52 of the reinforcing member 5 is provided only in a part of the cylindrical portion 241, a decrease in heat insulation performance can be suppressed.

[0023] [Modification Example] In the above embodiment, instead of the reinforcing member 5, the reinforcing member 8 shown in FIGS. 5(A) to 5(C) may be used. The reinforcing member 8 is formed by bending a metal plate, and includes a rectangular plate-shaped lower contact portion 81 whose longitudinal direction is parallel to the X-axis direction and whose short-side direction is parallel to the Z-axis direction, a connecting portion 82 that extends upward along the Y-axis direction from one short-side edge (outdoor side) of the lower contact portion 81, an upper contact portion 83 that extends inward along the Z-axis direction from the upper end of the connecting portion 82, and a pair of reinforcing member fixing portions 84 that extend in a direction away from each other along the X-axis direction from both longitudinal edges of the upper contact portion 83. Four screw insertion holes 811 arranged in the X-axis direction are formed in the lower contact portion 81. The upper contact portion 83 is formed in the same rectangle as the lower contact portion 81 in plan view. Screw insertion holes 831 are formed at positions corresponding to the screw insertion holes 811 in the upper contact portion 83. Screws 16 for fixing the door closer 6 to the back plate 4 are inserted through the screw insertion holes 811 and 831. Each reinforcing member fixing portion 84 is formed such that the indoor end face is located on the same plane as the indoor end face of the upper contact portion 83, while the outdoor end face is located closer to the indoor side than the outdoor end face of the upper contact portion 83. One screw insertion hole 841 is formed in each reinforcing member fixing portion 84. The reinforcing member 8 is fixed to the indoor upper profile 26 in a state where the upper surface of the upper contact portion 83 is in surface contact with the lower surface of the upper frame connecting portion 266 and the lower surface of the lower contact portion 81 is in surface contact with the upper surface of the bottom portion 241A by a screw 15 inserted through the screw insertion hole 841 and screwed into the female screw portion 266A of the upper frame connecting portion 266 within the cylindrical portion 241 of the resin upper frame member 24.

[0024] The reinforcing members 5 and 8 do not necessarily have to be provided with the reinforcing member fixing portions 54 and 84. In this case, with the reinforcing members 5 and 8 arranged in the cylindrical portion 241, the resin upper frame member 24 may be temporarily fixed to the outdoor upper profile member 25. An airtight material 7 may not be provided between the back plate connecting portion 44 and the upper frame connecting portion 266, and the lower surface of the back plate connecting portion 44 and the upper surface of the upper frame connecting portion 266 may be in surface contact. The lower contact portion of the reinforcing member may be formed in a plate shape extending in the vertical direction, and the end surface of the lower contact portion may be in surface contact with the bottom surface portion 241A. The reinforcing member may be formed in a block shape. In this case, it may or may not be provided with a reinforcing member fixing portion. Although the screw 15 is exemplified as the reinforcing member fixing tool for fixing the reinforcing member to the upper frame connecting portion, an adhesive or a double-sided tape may also be used.

[0025] [Summary of the Invention] The connection structure of the door closer of the present invention is a connection structure of a door closer fixed to the indoor side of a door that is openably and closably attached within a door frame, using a back plate, a reinforcing member, and a door closer fixing tool, and connecting to the upper frame of the door frame. The upper frame includes a metal upper frame member and a resin upper frame member attached to the metal upper frame member. The metal upper frame member includes a metal frame body and an upper frame connecting portion extending from the metal frame body toward the indoor side. The resin upper frame member is located below the upper frame connecting portion and includes a cylindrical portion having a cutout portion formed in a part of its upper portion. The back plate includes a back plate fixing portion and a plate-shaped back plate connecting portion. With the back plate connecting portion in surface contact with the upper surface of the upper frame connecting portion, the back plate fixing portion is fixed to the metal frame body. The reinforcing member includes an upper contact portion and a lower contact portion. The upper contact portion exposed through the cutout portion contacts the lower surface of the upper frame connecting portion, and the lower contact portion contacts the inner peripheral surface of the cylindrical portion. The reinforcing member is disposed within the cylindrical portion. The door closer is connected to the upper frame by fixing the door closer fixing tool inserted through the cylindrical portion, the reinforcing member, and the upper frame connecting portion to the back plate connecting portion. According to the present invention, since the door closer is connected to the upper frame in a state where no gap is formed between the lower surface, which is the main surface of the plate-shaped back plate connecting portion, and the upper surface of the upper frame connecting portion, it is possible to suppress damage to the upper frame connecting portion due to the load from the door closer or loosening of the fixing by the door closer fixture.

[0026] In the connection structure of the door closer of the present invention, it is preferable that the lower contact portion is formed in a plate shape whose lower surface is in surface contact with the inner peripheral surface. According to the present invention, the contact area between the lower contact portion and the cylindrical portion can be increased, and deformation of the cylindrical portion can be suppressed.

[0027] In the connection structure of the door closer of the present invention, it is preferable that the reinforcing member includes a reinforcing member fixing portion, and the reinforcing member fixing portion is fixed to the upper frame connecting portion by a reinforcing member fixture. According to the present invention, after fixing the reinforcing member to the upper frame connecting portion with a reinforcing member fixture, the resin upper frame member can be attached to the metal upper frame member by releasing the hand from the reinforcing member, and workability is improved.

[0028] In the connection structure of the door closer of the present invention, the reinforcing member preferably includes a pair of upper contact portions extending upward from both side edges in the expected direction of the lower contact portion, a pair of connecting portions extending upward from both side edges in the finding direction of the lower contact portion, and a pair of reinforcing member fixing portions extending in a direction away from each other from the upper ends of the pair of connecting portions. According to the present invention, the reinforcing member can be manufactured only by bending a plate-shaped member, and the weight of the reinforcing member can also be reduced.

[0029] In the connection structure of the door closer of the present invention, it is preferable that an airtight material is provided between the back plate connecting portion and the upper frame connecting portion. According to the present invention, it is possible to suppress the entry of outside air into the room through the holes through which the door closer fixtures are inserted in the upper frame connecting portion and the back plate connecting portion.

Explanation of reference numerals

[0030] 1…hinged door, 2…door frame, 3…door, 4…back plate, 5, 8…reinforcing member, 6…door closer, 7…airtight material, 15…screw (reinforcing member fixing tool), 16…screw (door closer fixing tool), 21…upper frame, 23…metal upper frame member, 24…resin upper frame member, 41…back plate fixing portion, 44…back plate connecting portion, 51, 81…lower contact portion, 52…upper contact portion, 53, 83…connecting portion, 54, 84…reinforcing member fixing portion, 241…cylindrical portion, 244…cut-out portion, 251…metal frame body, 266…upper frame connecting portion, 623…bracket.

Claims

1. A connection structure of a door closer fixed to the indoor side of a door that is attached to be freely openable and closable within a door frame, which connects the door closer to the upper frame of the door frame using a back plate, a reinforcing member, and a door closer fixture, wherein the upper frame includes a metal upper frame member and a resin upper frame member attached to the metal upper frame member, the metal upper frame member includes a metal frame body and an upper frame connection portion extending from the metal frame body toward the indoor side, the resin upper frame member is located below the upper frame connection portion and includes a cylindrical portion having a cutout portion formed in a part of its upper portion, the back plate includes a back plate fixing portion and a plate-like back plate connection portion, and the back plate fixing portion is fixed to the metal frame body in a state where no gap is formed between the lower surface of the back plate connection portion and the upper surface of the upper frame connection portion, the reinforcing member includes an upper contact portion and a lower contact portion, and the upper contact portion exposed through the cutout portion is in contact with the lower surface of the upper frame connection portion, and the lower contact portion is disposed within the cylindrical portion in a state of being in contact with the inner peripheral surface of the cylindrical portion, the door closer is connected to the upper frame by fixing the door closer fixture inserted through the cylindrical portion, the reinforcing member, and the upper frame connection portion to the back plate connection portion. A connection structure of a door closer.

2. In the connection structure of a door closer according to Claim 1, the lower contact portion is formed in a plate shape whose lower surface is in surface contact with the inner peripheral surface. A connection structure of a door closer.

3. In the connection structure of a door closer according to Claim 2, the reinforcing member includes a reinforcing member fixing portion, and the reinforcing member fixing portion is fixed to the upper frame connection portion by a reinforcing member fixture. A connection structure of a door closer.

4. In the connection structure of a door closer according to Claim 3, the reinforcing member includes a pair of the upper contact portions extending upward from both side edges in the expected direction of the lower contact portion, a pair of connection portions extending upward from both side edges in the found direction of the lower contact portion, and a pair of the reinforcing member fixing portions extending in a direction away from each other from the upper ends of the pair of connection portions. A connection structure of a door closer.

5. In the connection structure of a door closer according to Claim 1, an airtight material is provided between the back plate connection portion and the upper frame connection portion. A connection structure of a door closer.

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