Door closer

Abstract

To provide a door closer allowing work load of attachment work of the door closer to be reduced.SOLUTION: A door closer is provided with: a first bracket piece 11; a second bracket piece 12 attached on a door frame or a door together with the first bracket piece 11 to be allowed to rotate around a specific axis line 3 relative to the first bracket 11, on which a first serration 35 is arranged; a stop member 50 on which a second serration 51 engaging with the first serration 35; an operation member 60 operated in a first direction and a second direction by an operator; and a linkage part 22 integrating the first bracket piece 11 and the second bracket piece 12 such that those are not allowed to rotate relatively when the operation member 60 is operated in the first direction.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a door closer equipped with a stop device that holds a door open. [Background technology]

[0002] The applicant has proposed a door closer equipped with an adjustable bracket as described in Patent Document 1 below. As shown in Fig. 6, the bracket of this door closer has a pair of left and right bracket pieces 101 (pivoting pieces) that can pivot relative to each other, and each bracket piece 101 is provided with a mounting hole 103. Each bracket piece 101 is also provided with an auxiliary piece 102 (free piece) that can move via an elongated hole, and the auxiliary pieces 102 are also provided with a mounting hole 103. Therefore, the mounting holes 103 of each bracket piece 101 and auxiliary piece 102 can be made to fit a wide range of fixture mounting holes, which are screw holes in the door frame. This is particularly effective when replacing an existing door closer, and when installing a new door closer in the existing door frame, the existing fixture mounting holes can be used as they are to install the bracket of the new door closer.

[0003] The door closer is also equipped with a stop device for holding the door open. When installing the door closer, first the bracket is attached to the door frame, and the door closer body is attached to the door, and then the stop device is set. When installing the bracket, a pair of bracket pieces 101 and auxiliary pieces 102 are screwed into existing fixture mounting holes, and fixing screws 104 are tightened to prevent the pair of bracket pieces 101 from rotating relative to each other. After that, the bolt 105 is tightened with the door set at a predetermined stop angle.

[0004] As described above, in the door closer in which the bracket 100 is of an adjustable type and which is provided with a stop device, the installation work is complicated and the workload is heavy. [Prior art documents] [Patent documents]

[0005] Patent Document 1 Japanese Patent No. 3213588 Summary of the Invention Problems to be Solved by the Invention

[0006] An object of the present invention is to reduce the work load of the installation work of a door closer. Means for Solving the Problems

[0007] The door closer according to the present invention includes a first bracket piece, a second bracket piece that is attached to a door frame or a door together with the first bracket piece and is relatively rotatable about a predetermined axis with respect to the first bracket piece and is provided with a first serration, a second serration that meshes with the first serration, a stop member that is movable along the axis between a meshing position where the second serration meshes with the first serration and a disengaged position where the second serration is separated from the first serration, and when in the meshing position, the door can be held at a stop angle, and when in the disengaged position, the stop angle can be adjusted; an operating member that is operated by an operator in a first direction and a second direction, and when operated in the first direction, holds the stop member in the meshing position, and when operated in the second direction, moves the stop member from the meshing position to the disengaged position; and an interlocking portion that integrally makes the first bracket piece and the second bracket piece non-rotatable relative to each other when the operating member is operated in the first direction. Note that the stop angle is the opening angle of the door when the door is held in an open state.

[0008] Before the door closer with this configuration is installed, the operating member is in a state of being operated in the second direction, which is the release direction, and the stop member is located at the disengaged position. When the stop member is at the disengaged position, the stop member is rotatable relative to the second bracket piece. Therefore, the stop angle can be adjusted by rotating the stop member relative to the second bracket piece. When installing the door closer, for example, the first bracket piece and the second bracket piece are fixed to the door frame, and after the stop angle is adjusted, the operating member is operated in the first direction, which is the fixing direction. When the operating member is operated in the first direction, the stop member comes to the engaged position and the stop member becomes non-rotatable relative to the second bracket piece. Further, in conjunction with the movement of the operating member in the first direction, the linking portion integrally fixes the first bracket piece and the second bracket piece so as not to be relatively rotatable. Therefore, the operator does not need to perform the fixing work between the bracket pieces separately from the operation of the operating member during the installation work of the door closer.

[0009] In particular, it is preferable that the operating member is a bolt, the second bracket piece is disposed between the first bracket piece and the stop member, and the linking portion is provided on the first bracket piece and has a female screw portion into which the bolt is screwed. According to this configuration, the stop member can be moved to the engaged position by rotating the bolt in the first direction, which is the tightening direction. And the bolt is screwed into the female screw portion of the first bracket piece. Therefore, by tightening the bolt, the second bracket piece can be relatively pressed against the first bracket piece. When the first bracket piece and the second bracket piece come into strong contact with each other, the relative rotation between the first bracket piece and the second bracket piece is prevented.

[0010] Furthermore, it is preferable that the first bracket piece has an insertion cylinder portion that enters the second bracket piece, and the female screw portion is formed on the inner peripheral surface of the insertion cylinder portion. According to this configuration, the tip of the bolt is less likely to protrude from the first bracket piece, and a good external appearance can be obtained.

Advantages of the Invention

[0011] As described above, by operating the operation member in the first direction, the stop member can be moved to the engaged position and the relative rotation of the first bracket piece and the second bracket piece becomes impossible, so that the attachment work can be simplified and the work load of the operator can be reduced.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiments for Carrying Out the Invention

[0013] Hereinafter, a door closer according to an embodiment of the present invention will be described with reference to FIGS. 1 to 5. The door closer in this embodiment includes a door closer body (not shown) attached to one of a door and a door frame, a bracket 1 attached to the other of the door and the door frame, and a link mechanism that connects the door closer body and the bracket 1. In this embodiment, a case where the door closer body is attached to the door and the bracket 1 is attached to the door frame will be described. The link mechanism includes a first link (not shown) and a second link 2. One end of the first link is connected to the main shaft of the door closer body, and the first link rotates together with the main shaft about the main shaft. One end of the second link 2 is rotatably connected to the other end of the first link. Then, as shown in FIG. 1, the bracket 1 is rotatably connected to the other end of the second link 2. The door rotates, for example, about a vertical axis. The main shaft has a vertical axis. The rotation axis between the first link and the second link 2 is along the vertical direction, and the rotation axis between the second link 2 and the bracket 1 is also along the vertical direction. This rotation axis between the second link 2 and the bracket 1 will be referred to as the bracket axis 3. The bracket 1 is screwed, for example, from below into the fitting hole of the upper frame of the door frame.

[0014] FIGS. 1 and 2 show the configuration in the vicinity of the bracket axis 3. The bracket 1 has a pair of left and right bracket pieces (rotating pieces). That is, the bracket 1 has a first bracket piece 11 and a second bracket piece 12. The first bracket piece 11 and the second bracket piece 12 are configured to be relatively rotatable with respect to each other about the bracket axis 3. The first bracket piece 11 and the second bracket piece 12 rotate about their respective base ends. In plan view, the first bracket piece 11 is located on the left side and the second bracket piece 12 is located on the right side. In addition, mounting holes 13 are provided in the first bracket piece 11 and the second bracket piece 12, respectively. Further, the first bracket piece 11 and the second bracket piece 12 each include an auxiliary piece (free piece) (not shown) having a mounting hole. The auxiliary piece is configured to be movable with respect to the first bracket piece 11 and the second bracket piece 12 by a long hole. Since the configuration of the mounting hole 13 and the auxiliary piece is the same as the configuration in FIG. 6, a detailed description will be omitted.

[0015] The first bracket piece 11 is located at the uppermost position on the bracket axis 3. Figure 4 shows the first bracket piece 11 in a standalone state. The first bracket piece 11 has a first plate portion 20 and an entrance tubular portion 21. The first plate portion 20 extends horizontally from the bracket axis 3. The first plate portion 20 is provided with a mounting hole 13 and has an auxiliary piece movably mounted thereon. The entrance tubular portion 21 protrudes downward from the first plate portion 20. The entrance tubular portion 21 is cylindrical and centered on the bracket axis 3, and has a female thread portion 22 formed on its inner circumferential surface.

[0016] To further explain the component configuration of the first bracket piece 11, in this embodiment, the first plate portion 20 and the insertion tube portion 21 are configured as separate members. That is, the first bracket piece 11 includes a plate-shaped first main piece 23 and a cylindrical screw tube 24 fixed to the first main piece 23. The first main piece 23 forms the first plate portion 20, and the screw tube 24 forms the insertion tube portion 21. The first main piece 23 has a first mounting hole 25 that penetrates in the vertical direction centered on the bracket axis 3. The screw tube 24 is inserted into the first mounting hole 25 from above. The screw tube 24 is cylindrical and centered on the bracket axis 3. The screw tube 24 penetrates the first mounting hole 25 and protrudes downward from the first main piece 23 by a predetermined length. The lower part of the screw tube 24 protruding downward from the first main piece 23 forms the insertion tube portion 21. The screw tube 24 has an upper flange 26 at its upper end. An upper flange 26 is welded to the upper surface of the first main piece 23. The screw cylinder 24 has a through hole that penetrates in the vertical direction. The above-mentioned female thread portion 22 is formed on the inner circumferential surface of the screw cylinder 24. The female thread portion 22 is formed on the lower part of the inner circumferential surface of the screw cylinder 24, and is formed over a predetermined length from the lower end of the screw cylinder 24 toward the upper side. The female thread portion 22 is located below the first main piece 23, and is also located in the entry tube portion 21. The upper part of the inner circumferential surface of the screw cylinder 24 is configured as a smooth surface portion 27 where the female thread portion 22 is not formed, and the smooth surface portion 27 has a larger diameter than the female thread portion 22.

[0017] The second bracket piece 12 is located below the first bracket piece 11 on the bracket axis 3. Figure 5 shows the second bracket piece 12 in a single state. The second bracket piece 12 has a second plate portion 30 and a support shaft portion 31. The second plate portion 30 extends horizontally from the bracket axis 3. Similar to the first plate portion 20, mounting holes 13 are provided in the second plate portion 30 and auxiliary pieces are movably provided. The second plate portion 30 extends to the right in a plan view with respect to the first plate portion 20. The second plate portion 30 overlaps the lower side of the first plate portion 20, and the upper surface of the second plate portion 30 is configured to be abutted against the lower surface of the first plate portion 20. The support shaft portion 31 projects downward from the second plate portion 30. The support shaft portion 31 is cylindrical with the bracket axis 3 as the center.

[0018] Regarding the member configuration of the second bracket piece 12, further explanation is as follows. In this embodiment, the second plate portion 30 and the support shaft portion 31 are configured as separate members. That is, the second bracket piece 12 includes a plate-shaped second main piece 32 and a cylindrical rotating shaft 33 fixed to the second main piece 32. The second main piece 32 constitutes the second plate portion 30, and the rotating shaft 33 constitutes the support shaft portion 31. The second main piece 32 has a second mounting hole 34 that penetrates vertically with the bracket axis 3 as the center. The upper end portion of the rotating shaft 33 is inserted into the second mounting hole 34 from the lower side. The rotating shaft 33 is cylindrical with the bracket axis 3 as the center.

[0019] The upper end of the rotating shaft 33 passes through the second mounting hole 34 and is caulked to the upper surface of the second main piece 32. Most of the rotating shaft 33 is located below the second main piece 32. Among the entire length of the rotating shaft 33, the portion protruding downward from the second main piece 32 is the support shaft portion 31. A first serration 35 is formed on the outer peripheral surface of the support shaft portion 31. The first serration 35 extends in the vertical direction and is provided over the entire circumference of the outer peripheral surface of the support shaft portion 31. The first serration 35 is provided at the central portion of the entire vertical length of the outer peripheral surface of the support shaft portion 31 and is not provided at the upper and lower portions of the outer peripheral surface of the support shaft portion 31. The upper portion of the outer peripheral surface of the support shaft portion 31 is the upper support surface 36, which is adjacent to the upper side of the first serration 35. The lower portion of the outer peripheral surface of the support shaft portion 31 is the lower support surface 37, which is adjacent to the lower side of the first serration 35. The lower support surface 37 has a smaller diameter than the upper support surface 36.

[0020] A through hole that penetrates the rotating shaft 33 in the vertical direction is formed at the center of the rotating shaft 33. The through hole has a support hole 38 that constitutes the upper portion of the through hole and a bolt insertion hole 39 that is adjacent to the lower side of the support hole 38 and constitutes the lower portion of the through hole. The support hole 38 opens to the upper end surface of the rotating shaft 33. The entering cylinder portion 21 is inserted into the support hole 38. The outer peripheral surface of the entering cylinder portion 21 is rotatably supported by the wall surface of the support hole 38. Therefore, the first bracket piece 11 is rotatably supported by the rotating shaft 33. The bolt insertion hole 39 has a smaller diameter than the support hole 38. The bolt insertion hole 39 opens to the lower end surface of the rotating shaft 33.

[0021] The other end of the second link 2 branches vertically and has a pair of plate-shaped branched pieces that face each other vertically. The upper branched piece 40 and the lower branched piece 41, which are the pair of upper and lower branched pieces, are each rotatably supported by the rotating shaft 33. The upper branched piece 40 is supported by the upper support surface 36 of the rotating shaft 33 via a cylindrical upper bush 42, and the lower branched piece 41 is supported by the lower support surface 37 of the rotating shaft 33 via a cylindrical lower bush 43. A lower flange 43a is formed at the lower end of the lower bush 43.

[0022] A horizontally extending slit 44 is formed between the upper branch piece 40 and the lower branch piece 41. A plate-shaped stop member 50 is disposed in the slit 44. The pivot shaft 33 passes through the stop member 50 in the vertical direction. A through-hole through which the pivot shaft 33 passes is formed in the stop member 50, and second serrations 51 that engage with the first serrations 35 are formed on the wall surface of this through-hole. The stop member 50 is vertically movable relative to the pivot shaft 33. Specifically, the stop member 50 is movable between an engagement position where the second serrations 51 engage with the first serrations 35 and a disengagement position where the second serrations 51 disengage from the first serrations 35. Note that once the stop member 50 reaches the upper end 35a of the first serrations 35, it cannot move any further. This position is referred to as the engagement position. The disengagement position is where the second serrations 51 are completely separated downward from the first serrations 35. The state shown in Figures 1 and 2 is the engaged position, and the state shown in Figure 3 is the disengaged position. Furthermore, the stop member 50 is shown by a two-dot chain line in Figure 5, with the position of the stop member 50 shown at the top being the engaged position and the position of the stop member 50 shown at the bottom being the disengaged position. The stop member 50 can be further lowered from a state in which the second serrations 51 are spaced downward from the first serrations 35. Therefore, the disengaged position shown in Figure 3 is only an example, and the disengaged position is any position in which the stop member 50 is located on the lower support surface 37 of the pivot shaft 33. When the stop member 50 is in the engaged position, it cannot rotate relative to the pivot shaft 33. When the stop member 50 is in the disengaged position, it can rotate relative to the pivot shaft 33.

[0023] A cam surface 52 is formed on the circumferential surface of the stop member 50. The stop member 50 is a plate cam. A stop ball 53 abuts against the cam surface 52 of the stop member 50 from the outside. The stop ball 53 is built into the second link 2 near the base ends of the upper branch piece 40 and the lower branch piece 41. The second link 2 also has a built-in spring (not shown) that presses the stop ball 53 toward the stop member 50. When the door rotates with the second serrations 51 of the stop member 50 engaged with the first serrations 35 of the pivot shaft 33, the second link 2 rotates relative to the pivot shaft 33 and the stop member 50 as the door opens and closes, and the stop ball 53 rolls on the cam surface 52 in the circumferential direction while abutting against the cam surface 52. An engagement recess 54 is formed at a predetermined location on the cam surface 52. As the second link 2 rotates relative to the pivot shaft 33 and the stop member 50 in accordance with the door opening operation, the stop ball 53 rolls on the cam surface 52 and eventually engages with the engagement recess 54. FIG. 1 shows the state in which the stop ball 53 is engaged with the engagement recess 54. When the stop ball 53 engages with the engagement recess 54, the second link 2 essentially cannot rotate any further relative to the stop member 50. Therefore, the door stops at the opening angle and is maintained at that opening angle. The opening angle of the door when it is maintained in the open position is referred to as the stop angle. The stop angle can be changed as desired by moving the stop member 50 to the disengagement position. In this embodiment, the stop member 50, the stop ball 53, and the spring constitute a stop device that maintains the door in the open position.

[0024] The upper end surface of the lower bushing 43 abuts against the lower surface of the stop member 50. In the fully attached state shown in Figures 1 and 2, the lower bushing 43 presses the stop member 50 upward, the stop member 50 is in the engagement position, and the stop member 50 has reached the upper end 35a of the first serration 35 and cannot rise any further. Therefore, the stop member 50 is sandwiched between the lower bushing 43 and the upper end 35a of the first serration 35.

[0025] A pressing plate 55 is disposed below the lower bush 43. The pressing plate 55 is disc-shaped, and its peripheral edge is in contact with the lower flange 43a of the lower bush 43. In this embodiment, the lower bush 43 and the pressing plate 55 are configured as separate bodies, but they may be formed as a single member. A lower cover 56 is disposed below the pressing plate 55. The lower cover 56 covers substantially the entire lower surface of the pressing plate 55 from below.

[0026] A bolt 60 is provided as an operating member. The bolt 60 is disposed on the bracket axis 3 and is screwed in from the lower side to the upper side. The bolt 60 has a head 60a and a shaft portion 60b, and the head 60a of the bolt 60 is located below the shaft portion 60b. In the mounted state as shown in FIGS. 1 and 2, the bolt 60 penetrates the pressing plate 55 and the lower cover 56 in the vertical direction, penetrates the bolt insertion hole 39 of the rotation shaft 33, and reaches the screw cylinder 24. The bolt 60 is screwed into the female screw portion 22 of the screw cylinder 24. The bolt 60 penetrates the female screw portion 22 and reaches inside the sliding surface portion 27 of the screw cylinder 24. However, the tip of the shaft portion 60b of the bolt 60 does not protrude above the screw cylinder 24 and remains below the upper end surface of the screw cylinder 24. By not allowing the tip of the bolt 60 to protrude above the upper end surface of the screw cylinder 24 in this way, a good aesthetic appearance is ensured. A spring washer 61 is disposed between the head 60a of the bolt 60 and the lower cover 56.

[0027] Before the door closer as described above is attached to the door and the door frame, as shown in FIG. 3, the bolt 60 is in a state where it is operated in the second direction which is the release direction and is loosened. The bolt 60 is located lower than in the fully attached state shown in FIGS. 1 and 2. As the bolt 60 is loosened and descends, the lower cover 56, the pressing plate 55, and the lower bush 43 are also in a state of having descended. Since the bolt 60 is loosened, the stop member 50 is released from the upward pressing force by the lower bush 43, and the stop member 50 is located at a disengaged position which is lower than the engaged position. Also, the upper branch piece 40 and the lower branch piece 41 of the second link 2 have moved downward together with the stop member 50.

[0028] The first bracket piece 11 and the second bracket piece 12 are in a state where they can rotate relative to each other. Since the bolt 60 is loosened, the tightening force of the bolt 60 does not act on the rotation shaft 33 via the lower bush 43 and the stop member 50. That is, the tightening force of the bolt 60 does not act on the second bracket piece 12. Therefore, the second plate portion 30 of the second bracket piece 12 does not strongly adhere to the first plate portion 20 of the first bracket piece 11, and the second bracket piece 12 and the first bracket piece 11 can rotate relative to each other. Also, since the stop member 50 is located at the disengaged position, the second bracket piece 12, the stop member 50, and the second link 2 can rotate relative to each other.

[0029] When installing the door closer, the door closer is in a state where the bolt 60 is loosened as shown in Fig. 3. Also, the door closer is in a state where the stop ball 53 is engaged with the engagement recess 54 of the stop member 30. First, attach the door closer body to the door and attach the bracket 1 to the door frame. Since the first bracket piece 11 and the second bracket piece 12 are relatively rotatable with respect to each other, align the mounting holes 13 of the first bracket piece 11 and the second bracket piece 12 with the fitting holes of the door frame fittings, and screw the first bracket piece 11 and the second bracket piece 12 to the door frame. Next, rotate the stop member 50 and the second link 2 with respect to the second bracket piece 12 to set the stop angle.

[0030] After setting the stop angle, rotate the bolt 60 in the tightening direction, which is the fixing direction (first direction). As the bolt 60 is tightened, the bolt 60 rises, and the head 60a of the bolt 60 pushes up the lower cover 56, the pressing plate 55, and the lower bush 43. Due to the rise of the lower bush 43, the stop member 50 is pushed up by the lower bush 43, and the upper branch piece 40 and the lower branch piece 41 of the second link 2 also rise. The second serration 51 of the stop member 50 begins to mesh with the first serration 35 of the rotation shaft 33, and eventually, as shown in Fig. 2, the stop member 50 reaches the upper end 35a of the first serration 35, which is the upper limit of its movement range.

[0031] After the stop member 50 has risen to the meshing position, if the bolt 60 is further tightened, in conjunction with the stop member 50 strongly pressing against the upper end 35a of the first serration 35, the upper surface of the second plate portion 30 of the second bracket piece 12 will strongly adhere to the lower surface of the first plate portion 20 of the first bracket piece 11. When the second bracket piece 12 strongly adheres to the first bracket piece 11, due to the frictional force between the first bracket piece 11 and the second bracket piece 12, the two become in a state where they cannot rotate relative to each other. Thus, when installing the door closer, the operator only needs to perform the operation of tightening the bolt 60, and there is no need to perform a fixing operation to prevent relative rotation between the first bracket piece 11 and the second bracket piece 12 separately from the tightening operation of the bolt 60.

[0032] Also, since the insertion cylinder portion 21 protrudes downward from the first plate portion 20 in the first bracket piece 11, the tip of the bolt 60 is less likely to protrude upward from the first bracket piece 11, and a good external appearance can be ensured.

[0033] In addition, in this embodiment, the bolt 60 is provided as the operation member, but a cam member may be used instead of the bolt 60.

Explanation of Reference Numerals

[0034] 1 Bracket 2 Second Link 3 Bracket Axis 11 First Bracket Piece 12 Second Bracket Piece 13 Mounting Hole 20 First Plate Portion 21 Insertion Cylinder Portion 22 Female Screw Portion (Interlocking Portion) 23 First Main Piece 24 Screw Cylinder 25 First Mounting Hole 26 Upper Flange 27 Sliding Surface Portion 30 Second Plate Portion 31 Support Shaft Portion 32 Second Main Piece 33 Rotation Axis 34 Second Mounting Hole 35 First Chamfer 35a Upper End Portion 36 Upper Support Surface 37 Lower Support Surface 38 Support Hole 39 Bolt Insertion Through-Hole 40 Upper Branch Piece 41 Lower Branch Piece 42 Upper Bush 43 Lower Bush 43a Lower Flange 44 Slit 50 Stop Member 51 Second Chamfer 52 Cam Surface 53 Stop ball 54 Engagement recess 55 Pressing plate 56 Lower cover 60 Bolt (operating member) 60a Head 60b Shaft portion 61 Spring washer 101 Bracket piece 102 Auxiliary piece 103 Mounting hole 104 Fixing screw 105 Bolt

Claims

1. a first bracket piece, a second bracket piece attached to the door frame or door together with the first bracket piece, relatively rotatable about a predetermined axis with respect to the first bracket piece, and provided with a first serration, a stop member provided with a second serration that meshes with the first serration, the second serration being movable along the axis between a meshing position where the second serration meshes with the first serration and a disengaged position where the second serration is separated from the first serration, and when in the meshing position, being able to hold the door at a stop angle, and when in the disengaged position, the stop angle being adjustable, an operating member operated by an operator in a first direction and a second direction, and when operated in the first direction, holding the stop member in the meshing position, and when operated in the second direction, being able to move the stop member from the meshing position to the disengaged position, an interlocking part that integrally makes the first bracket piece and the second bracket piece non-rotatable relative to each other when the operating member is operated in the first direction, A door closer comprising:

2. The operating member is a bolt, The second bracket piece is disposed between the first bracket piece and the stop member, The door closer according to claim 1, wherein the interlocking part is provided on the first bracket piece and has a female screw part into which the bolt is screwed.

3. The door closer according to claim 2, wherein the first bracket piece has an entering cylinder part that enters the second bracket piece, and the female screw part is formed on the inner peripheral surface of the entering cylinder part.

Images