TWI534334B - Door closet - Google Patents

Description

Door closer

This creation is about a door closer, especially a door closer that is installed between the door frame and the door panel to close the door.

The door closer assembly structure currently installed between the door frame and the door panel, as shown in FIG. 10, mainly has a hollow long tube 70 having a long groove and a connecting block 76 for fixing to the top of the door panel 61 respectively. On the upper frame of the door frame 60, a slideable slider 71 is mounted in the long slot of the long tube 70, and a connecting arm set 72 is connected between the slider 71 and the connecting block 76. The arm assembly 72 has a hollow arm tube 73 and an arm 74 in the arm tube 73. One end of the arm tube 73 is pivotally connected to the slider 71. One end of the arm rod 74 extending beyond the arm tube 73 is pivotally connected to the connecting block. 76, and one end of the arm 74 extending into the arm tube 73 is locked by a fixing member such as a screw, and the arm 74 can adjust the position with respect to the arm tube 73 to change the total length of the connecting arm group 72.

After the door closer is connected to the door frame and the door panel, when the door panel 61 is opened, the connecting arm group 72 of the door closer is slid in the long tube 70 by the sliding movement of the slider 71 with the door panel 61. When the door panel 61 is closed, the connecting arm group 72 is reversely slid in the long tube 70 by the closing movement of the slider 71 with the door panel 61, and is assisted by the connecting arm group 72 to push the door panel 61 to rotate in the direction of the door frame. .

In the composition of the conventionally known door closer, although the connecting arm group has a function of adjusting the total length, the door closer can be appropriately adjusted in length according to the door panels of different sizes. However, the door closer is based on cost considerations, and the smoothness of the rotation of the door closer after being connected to the door panel. The length of the arm tube and the arm in the connecting arm group in the door closer must be planned in stages. The connecting arm set can only be adjusted in length within a small size range, and the door closer can be made into a variety of product items of different length and size specifications according to different door panel specifications, in order to meet the market demand. However, the length of the arm tube and the arm of the connecting arm group made under each specification is constant, and the length range of the adjustable arm is small. Therefore, the conventional door closer has the door closer of each product item under the existing structure. Due to the small size range of the door panel and the difficulty in improving its applicability, it is not possible to reduce the number of product specifications required to manufacture the door device in order to comply with the market.

The main purpose of this creation is to provide a door closer, which is designed to solve the problem that the length adjustment range of the related door device is small, and the door closer products of various length specifications must be manufactured to meet the requirements of various specifications of the door panel.

In order to achieve the foregoing, the door closer proposed by the present invention comprises: a fixed tube set including a long tube including two opposite side walls and a long slot extending axially between the two side walls The two ends of the long tube are respectively a first end and a second end; a bidirectional slider, one end of which is a connecting end, and the bidirectional slider is connected to the first end or the second end of the long tube The end mode is axially slidably mounted in the long tube; and an extension arm set includes an extension arm catheter, an extension arm, an extension arm lock and a set of connectors, the axis of the extension arm catheter The two ends are respectively a first end portion and a second end portion, and the extension arm duct has an axially extending side slot, and the first end portion of the extension arm duct is pivotally disposed on the two-way slider The extension arm is movably assembled in the extension arm duct, and the extension arm is fixed to the side slot of the extension arm duct in combination with the extension arm lock member, so that the extension arm group adjusts its total length and extends the arm extension One end of the second end of the extension arm conduit is a connection end, and the assembly Pivoted to the connecting end portion of the extension arm.

By extending the door closer, the extension arm is mainly provided with an extension arm in an extension arm catheter, and the extension arm is fixedly fixed to the extension arm catheter by the extension arm lock. The utility model is capable of adjusting the total length thereof and pivoting one end of the extension arm conduit to one end of the two-way slider, whereby the two-way slider can be assembled in the long tube bidirectionally and can be arranged in the long tube The inner axial sliding, combined with the extension arm group, can adjust the combined structure of the total length, so that the double adjustment mechanism enables the door closer to be adjustable in the limited length range of the limited extension arm group, further combining the two-way slider reversing The length variation caused by the assembly can be increased, and the range of applicable distances can be increased to solve the problem that the length range of the applicable door length is small, and it is necessary to manufacture a plurality of sets of different sizes of door closer products in accordance with market demand.

As shown in FIG. 1 and FIG. 2, a preferred embodiment of the present invention is disclosed. The door closer includes: a fixed tube set 10, a bidirectional slider 20, and an extended arm set 30, or further A buffer group 40 and a switch switching assembly 50 are included.

As shown in FIG. 1 and FIG. 2 , the fixed tube set 10 includes a long tube 11 , and the long tube 11 includes two opposite side walls 111 , and a groove track 112 is formed on one side of the two side walls 111 . An elongated slot 113 extending axially between the slot rails 112 has a slot bottom plate 114 between the two side walls 111 of the long tube 11 and the other side of the slot 31. In the preferred embodiment, The long tube 11 is a rectangular tube member. The long tube 11 has a first end 115 and a second end 116 respectively located at opposite ends of the long tube 11. The long tube 11 is provided with a first end plug at the first end 115. 12, a second end plug 13 is disposed at the second end 116. The slot bottom plate 114 defines a limiting protrusion 117 adjacent to the first end 115 at a predetermined length.

As shown in FIG. 1 and FIG. 2, one end of the two-way slider 20 is a connecting end 21, and the two-way slider 20 can be installed in the long tube 11 in a bidirectional manner, that is, the two-way slider 21 is mounted with its connecting end 21 toward the first end 115 of the long tube 11 (as shown in FIG. 1 or FIG. 3) or toward the second end 116 of the long tube 11 (as shown in FIG. 7). Inside the tube 11, it is axially slidable along the long tube 11. In the preferred embodiment, the two-way slider 20 is provided with a sliding slot 22 on opposite sides of the two-way slider 20, and the two-side sliding slot 20 is sleeved on the corresponding slot rail 112 of the long tube 11 respectively. The two-way slider 20 can be axially slid along the long tube 11.

As shown in FIG. 1 and FIG. 2, the extension arm assembly 30 includes an extension arm catheter 31, an extension arm 32, an extension arm lock member 33, and a set of connectors 34. The extension arm catheter 31 is a The elongate tubular member includes a first end portion 311 and a second end portion 312 respectively located at opposite ends of the extension arm duct 31. In the preferred embodiment, the extension arm duct 31 has an axially extending side slot. The port 313 has a positioning rack 314 having a plurality of meshing teeth on one side or opposite sides of the side slot 313. The first end portion 311 of the extension arm duct 31 is pivoted by a pivoting member 317 such as a rivet, a cylinder or a fixing pin. It is provided at the connecting end 21 of the two-way slider 20 and can be rotated outside the long tube 11.

As shown in FIG. 2, in the preferred embodiment, one end block 315 can be disposed in the first end portion 311 of the extension arm duct 31, and a wear pad is disposed between the extension arm duct 31 and the bidirectional slider 20. The piece 316 is pivotally disposed on the connecting end 21 of the bidirectional slider 20 by a pivoting member 317 such as a rivet, a cylinder or a fixing pin passing through the end block 315, the extension arm duct 31 and the wear pad 316.

As shown in FIG. 1 and FIG. 2, the extension arm 32 is an elongated member and is installed in the extension arm duct 31, and can be axially adjusted along the extension arm duct 31 (as shown in FIG. 3 and FIG. 4). The extension arm 32 includes a positioning end portion 321 and a connecting end portion 322. The positioning end portion 321 and the connecting end portion 322 are located at opposite ends of the extending arm 32. The connecting end portion 322 extends and extends. The arm tube 31 is outside.

As shown in FIG. 2 and FIG. 4, the extension arm locking member 33 is assembled with the positioning end portion 321 of the extension arm 32, and the positioning extension arm conduit 31 can be assembled and adjusted. In the preferred embodiment, The extending arm locking member 33 includes a locking portion 331 and a covering portion 333 formed on one side of the locking portion 331. The engaging portion 331 forms engaging teeth 332 on one side or both sides, and the covering portion 333 is opposite to the engaging portion 333. Each of the two sides has a pressing edge 334 protruding from the outside of the engaging tooth 332. The extending arm locking member 33 is provided with two through holes 335. The extending arm locking member 33 passes through the screw 338. The through hole 335 is locked to the screw hole 323 of the positioning end portion 321 of the extending arm 32, and the locking portion 331 is located at the side notch 313 of the extension arm duct 31. The engaging teeth 332 and the positioning teeth of the locking portion 331 are provided. The engaging teeth of the rail 314 are in mesh with each other, and the pressing edge 334 abuts against the outside of the positioning rack 314 and clamps the positioning rack 314 with respect to the extending arm 32, so that the extending arm 32 is fixed to the extension arm duct 31.

As shown in FIG. 2 and FIG. 4, when the screw 338 screwed on the extension arm locking member 33 is rotatably released, the locking portion 331 having the engaging teeth 332 of the extension arm locking member 33 can be disengaged from the positioning tooth of the extension arm catheter 31. The rails 314 allow the extension arms 32 and the extension arm locks 33 thereon to change position in the extension arm conduits 31, thereby adjusting the total length of the extension arm sets 30. Similarly, the extension arm 32 is combined with the extension arm lock 33 in the extension arm conduit 31, and can also be locked, snapped, pressed, or other equivalent combination to reach the extension arm 32 in combination with the extension arm lock 33. The extension arm guide 31 can be adjusted for its integrated length.

As shown in FIG. 2, the assembly member 34 is pivotally connected to the connecting end portion 322 of the extending arm 32 by a screw, rivet or other pivoting member 342. The connecting end portion of the connecting member 34 and the extending arm 32 is connected. Between the 322, a wear-resistant spacer 341 for the pivoting member 342 is further disposed, and the plurality of through-holes are disposed on the assembly 34 for locking the door frame by screws.

As shown in FIG. 2, FIG. 3 and FIG. 5, the two-way slider 20 forms an axially extending recess 23 toward one side of the long tube 11, and the middle section of the two-way slider 20 has a lateral vertical communicating recess 23. The through hole 24, the two-way slider 20 is further provided with a buckle group 25, the buckle assembly 25 includes a fastening member 26, a spring piece 27, a fixing member 28 and a screw 29, the buckle The member 26 is a cylindrical member and is movably mounted in the through hole 24 . The elastic piece 27 is mounted in the recess 23 of the two-way slider 20 , and one end of the elastic piece 27 is fixed to the two-way slider 20 by a fixing member 28 . The other end of the elastic piece 27 is a movable crimping end and is pressed against the fastener 26, and the screw 29 is screwed into the two-way slider 20, and abuts the middle end of the elastic piece 27 with the end thereof for The adjustment elastic piece 27 applies the elastic piece 27 on the fastener 26.

As shown in FIG. 2, FIG. 3 and FIG. 5, the buffer group 40 includes an elastic member 41 and an abutting block 42. The abutting block 42 is axially movable along the long tube 11 and is long. Inside the first end 115 of the tube 11, the elastic member 41 is a spring element or a resilient member having a compression-recovery elasticity, and the elastic member 41 is mounted inside the long tube 11 and located at the abutting block 42 and the first end. Between the plugs 12, and the limiting protrusions 117 on the slot bottom plate 114 of the long tube 11 limit the range of axial displacement of the abutting block 42, and the elastic force can be applied to the two-way slider 20.

As shown in FIG. 2, FIG. 3 and FIG. 5, the switch switching assembly 50 is disposed adjacent to the buffer group 40 inside the long tube 11. The switch switching assembly 50 includes a pivot post 51 and a switching stop 52. And a knob 53 disposed perpendicularly to the axial direction of the long tube 11 between the two side walls 111 of the long tube 11, the switching block 52 is disposed on the pivot post 51, the switching block The pivoting member 52 and the pivot post 51 can be separate members, and can be combined by screwing or other fixing methods. Alternatively, the switching block 52 and the pivot post 51 can be integrally formed members. One end of the side wall 111 of the long tube 11 is assembled at one end of the pivot post 51 in the long tube 11, and is locked by a screw, so that the knob 53 can change the position of the switching block 52 on the pivot post 51 of the long tube 11 to change position. A first inclined surface 521 and a second inclined surface 522 are formed on the switching block 52. The first inclined surface 521 and the second inclined surface 522 are mutually opposite inclined surfaces, and one side of the first inclined surface 521 and the second inclined surface 522 A pointed convex portion is formed adjacent to or adjacent to each other, and the switching stopper 52 is located in the long tube 11, and the first inclined surface of the switching stopper 52 is first toward the long tube 11. The end 115 is inclined upward, and the second inclined surface 522 is inclined downward from the higher side of the first inclined surface 521 toward the first end 115 of the long tube 11, thereby utilizing the first inclined surface 521 and the second inclined surface 522 of the switching stopper 52. The buckle group 25 and the buffer group 40 mounted on the two-way slider 20 are matched with each other to achieve the function of the buckle positioning.

As shown in FIG. 2, FIG. 4 and FIG. 6, in the preferred embodiment, the extending arm 32 is provided with two screw holes 323 on the positioning end portion 321, and the extending arm 32 can also be positioned at the end portion 321 thereof. A through hole 324 is defined between the two screw holes 323. The extending arm locking member 33 is provided with a consistent hole 330 between the two through holes 335. The through hole 330 corresponds to the through hole 324 at the positioning end portion 321 of the extending arm 32. A compression spring 337 is disposed between the extension arm lock members 33, and is riveted by a rivet 336 through the through hole 324 of the extension arm 32 and the through hole 330 of the extension arm lock member 33, and the compression spring 337 is positioned on the extension arm. Between 32 and the extension arm lock 33, there is a certain movable distance between the extension arm 32 and the extension arm lock 33, whereby the rotation of the screw 338 between the lock extension arm 32 and the extension arm lock 33 is loosened. When the compression arm 337 applies a spring force to the extension arm lock member 33, the engagement portion 331 of the extension arm lock member 33 and the positioning rack 314 of the extension arm conduit 31 can be disengaged, and the rivet 336 can be The extension arm lock 33 provides a limit function to prevent the extension arm lock 33 and the extension arm 32 Full loose.

In the process of connecting the door closer and the door panel, as shown in FIG. 7, the door closer first selects the connecting end 21 of the two-way slider 20 toward the first end 115 of the long tube 11 or the second according to the size and size of the door panel. The end 116 is disposed in the direction of the long tube 11. As shown in FIG. 8, secondly, the fixed tube set 10 is embedded in a predetermined recess in the top of the door panel 61, and the fixed tube set 10 has the first end 115 of the buffer group 40 adjacent to the door panel 61 and the door frame 60. On the pivoting side, the assembly 34 of the extension arm assembly 30 is fixed to the bottom of the frame rod above the door frame 60. Thus, in the process of opening and closing the door panel 61, the extension arm group 30 is slid in the long tube 11 of the fixed tube group 10 by the rotation movement of the two-way slider 20 with the door panel 61 opening and closing.

As shown in FIG. 8 and FIG. 9, when the door panel 611 is rotated to a predetermined door opening position outside the door frame 60, the two-way slider 20 is moved toward the first end 115 of the long tube 11 by the extension arm group 30, and the two-way slide is performed. When the block 20 passes over the switch in the long tube 11 to switch over the assembly 50, the bottom of the two-way slider 20 is pushed into a shrapnel by the guidance of the first inclined surface 521 which is inclined upward by the switching block 52 toward the first end 115 of the long tube 11. The buckle member 26 is raised, and after the fastener 26 passes over the first slope 521, the fastener 26 abuts against the second slope 522 of the switching block 52 which is inclined downward toward the first end 115 of the long tube 11, and The abutting block 42 of the buffer group 40 that is pushed up by the elastic member 41 acts on the side end of the two-way slider 20 toward the first end 115, so that the two-way slider 20 is positioned between the switching block 52 and the abutting block 42, and The door panel 61 is positioned at the position where the door is opened. When the door panel 61 is rotated to close the door, the fastener 26 passes over the top of the switching block 52, and by the sliding arm group 30 combined with the sliding movement of the two-way slider 20 in the long tube 11, an auxiliary pushing effect is generated on the door panel 61 until the door panel 61 is screwed to the door frame 60 to close the door.

10‧‧‧Fixed pipe group
11‧‧‧Long tube
111‧‧‧ side wall
112‧‧‧ groove track
113‧‧‧ long slot
114‧‧‧Slot bottom plate
115‧‧‧ first end
116‧‧‧ second end
117‧‧‧Limited convex
12‧‧‧First end plug
13‧‧‧Second end plug
20‧‧‧Two-way slider
21‧‧‧Connecting end
22‧‧‧Chute
23‧‧‧ recess
24‧‧‧through hole
25‧‧‧Buckle set
26‧‧‧fasteners
27‧‧‧Shrap
28‧‧‧Fixed parts
29‧‧‧ screws
30‧‧‧Extension arm set
31‧‧‧Extended arm catheter
311‧‧‧ first end
312‧‧‧ second end
313‧‧‧ side notch
314‧‧‧ Positioning rack
315‧‧‧ end block
316‧‧‧ wear-resistant gasket
317‧‧‧ pivotal components
32‧‧‧Extension arm
321‧‧‧ positioning end
322‧‧‧Connected end
323‧‧‧ screw hole
324‧‧‧Perforation
33‧‧‧Extension arm lock
330‧‧‧through holes
331‧‧‧Card Department
332‧‧‧Meshing teeth
333‧‧‧ Covering Department
334‧‧‧ Pressing edge
335‧‧‧Perforation
336‧‧‧ Rivets
337‧‧‧Compression spring
338‧‧‧ screws
34‧‧‧Groups
341‧‧‧ wear-resistant gasket
342‧‧‧ pivotal components
40‧‧‧Buffering group
41‧‧‧Flexible components
42‧‧‧Abutment block
50‧‧‧Switching switch assembly
51‧‧‧ pivot
52‧‧‧Switching block
521‧‧‧ first slope
522‧‧‧second slope
53‧‧‧ knob
60‧‧‧ door frame
61‧‧‧ Door panel
70‧‧‧Long tube
71‧‧‧ Slider
72‧‧‧Connecting arm set
73‧‧‧arm tube
74‧‧‧Boom
75‧‧‧ fixing screws
76‧‧‧Connection block

1 is a perspective view of a preferred embodiment of a preferred embodiment of the present invention. Figure 2 is an exploded perspective view of the preferred embodiment of the door closer shown in Figure 1. 3 is a top plan view showing a preferred embodiment of the door closer shown in FIGS. 1 and 2. 4 is a top plan view showing the preferred embodiment of the door closer shown in FIGS. 1 and 2 in an extended state of the extension arm set. Figure 5 is a partial side cross-sectional view showing the position of the 5-5 cut line shown in Figure 3. Figure 6 is a partial side cross-sectional view showing the position of the 6-6 cut line shown in Figure 4. 7 is a preferred embodiment of the door closer shown in FIGS. 1 and 2, wherein the length of the two-way slider is adjusted toward the second end of the long tube, and the extension arm set is rotated to the first end of the long tube having the buffer group. The state of use of the side is referenced. FIG. 8 is a reference diagram of a state of use when the door panel is opened between the door frame and the door panel in the preferred embodiment of the present invention. FIG. 9 is a cross-sectional view showing the preferred embodiment of the present invention. After the door panel is opened, the two-way slider is moved toward the first end of the long tube to be buckled and positioned. Fig. 10 is a schematic plan view showing a conventional door closer applied between a door frame and a door panel.

10‧‧‧Fixed pipe set

11‧‧‧Long tube

112‧‧‧ groove track

113‧‧‧ long slot

115‧‧‧ first end

116‧‧‧ second end

12‧‧‧First end plug

13‧‧‧Second end plug

20‧‧‧Two-way slider

21‧‧‧Connecting end

29‧‧‧ screws

30‧‧‧Extension arm set

31‧‧‧Extended arm catheter

311‧‧‧ first end

314‧‧‧ Positioning rack

315‧‧‧ end block

317‧‧‧ pivotal components

32‧‧‧Extension arm

33‧‧‧Extension arm lock

34‧‧‧Groups

342‧‧‧ pivotal components

40‧‧‧Buffering group

41‧‧‧Flexible components

42‧‧‧Abutment block

53‧‧‧ knob

Claims (8)

A door closer includes: a fixed tube set including a long tube including two opposite side walls and a long slot extending axially between the two side walls, the two ends of the long tube axially respectively a first end and a second end; a two-way slider, one end of which is a connecting end, the two-way sliding block is axially slidably mounted to the first end or the second end of the long tube An extension arm assembly includes an extension arm conduit, an extension arm, an extension arm lock member, and a set of connectors, wherein the axial ends of the extension arm conduit are respectively a first end And a second end portion, the extension arm duct has an axially extending side slot, and the first end of the extension arm duct is pivotally connected to the connecting end of the two-way slider, and the extension arm can be The movable arm is disposed in the extension arm conduit, and the extension arm is combined with the extension arm locking member to be fixed at the side notch of the extension arm conduit, so that the extension arm group adjusts its total length, and the extension arm protrudes beyond the second end of the extension arm catheter One end is a connecting end, and the assembly is pivoted at a connecting end of the extending arm The door closer according to claim 1, wherein the extension arm duct forms a positioning rack having a plurality of meshing teeth on one side or opposite sides of the side slot, the extension arm being opposite to the other end of the connecting end a positioning end extending into the extension arm conduit, the extension arm locking member includes a locking portion and a cover portion formed on a side of the locking portion, the engaging portion forming a meshing tooth on one side or both sides The opposite sides of the cover portion each have a pressing edge, and the pressing edge protrudes out of the engaging tooth, and the extending arm locking member is locked on the positioning end of the extending arm by at least one screw, so that the extending arm locking member The engaging portion is located at a side slot of the extension arm duct, and the engaging teeth of the engaging portion and the meshing teeth of the positioning rack mesh with each other, and the pressing edge abuts against the outside of the positioning rack and is opposite to the extending arm to clamp the positioning rack , the extension arm is fixed to the extension arm catheter. The door closer according to claim 2, wherein a compression spring is disposed between the positioning end of the extension arm and the extension arm locking member, and the compression spring is positioned by the rivet to the extension arm locking member and the extension arm. Positioning between the ends and having a certain movable spacing between the extension arms and the extension arm locks. The door closer according to any one of claims 1 to 3, wherein the first end of the long tube is provided with a first end plug, and the second end is provided with a second end plug, and the two side walls of the long tube Forming a groove rail on each side of the long slot, the two side walls of the long tube respectively form axially extending groove rails on opposite sides of the long slot, and the two-way sliders are respectively provided with a sliding slot on opposite sides thereof. The two sides of the two-way slider are respectively sleeved on the corresponding groove rails of the long tube. The door closer according to claim 4, wherein the two-way slider forms an axially extending recess toward one side of the long tube, and the middle section of the two-way slider has a through hole vertically communicating with the recess, A spring buckle group is further disposed in the two-way slider, the spring buckle group includes a cylindrical fastener, a spring piece, a fixing component and a screw, and the fastener component is movably mounted in the through hole. The elastic piece is disposed in the concave portion of the two-way sliding block, and one end of the elastic piece is fixed in the two-way sliding block by a fixing member, and one end of the elastic piece is a movable pressing end and is pressed against the fastening component, and the screw is screwed on the In the two-way slider, the end of the screw abuts against the middle portion of the elastic piece; the two side walls of the long tube have a groove bottom plate on the other side of the long slot opening, and the slot bottom plate forms a limit adjacent to the predetermined length of the first end The position convex portion is further provided with a buffer group and a switch switching assembly. The buffer group includes an elastic member and an abutting block, and the abutting block can be installed on the first end of the long tube along the axial direction of the long tube. Internally, the elastic element is disposed between the abutting block and the first end plug The limiting protrusion on the bottom plate of the long tube limits the range of the axial displacement of the abutting block; the switch switching component is disposed at an adjacent buffer group inside the long tube, the switch switching component includes a pivot column, a switch a stopper and a knob, the pivot column is axially disposed between the two side walls of the long tube perpendicular to the long tube, the switching block is disposed on the pivot column, and the knob is from a side wall of the long tube The first inclined surface and the second inclined surface are formed on the switching block, and the first inclined surface of the switching block is inclined upward toward the first end of the long tube. The second inclined surface is inclined downward from the first side of the first inclined surface toward the first end of the long tube, and the first inclined surface is in contact with one side of the second inclined surface to form a pointed convex portion. The door closer according to any one of claims 1 to 3, wherein one end block is disposed in the first end of the extension arm duct, and a wear pad is disposed between the extension arm duct and the bidirectional slider, and A pivoting member is pivoted to the connecting end of the two-way slider through the end block, the extending arm conduit and the wear pad; a pivoting component is disposed between the connecting end of the connecting member and the extending arm Wear-resistant gaskets that pass through. The door closer according to claim 4, wherein one end block is disposed in the first end of the extension arm duct, and a wear pad is disposed between the extension arm duct and the bidirectional slider, and is worn by a pivoting component. The end block, the extension arm duct and the wear pad are pivotally disposed at the connecting end of the two-way slider; a wear pad for the pivoting member is disposed between the connecting end of the connecting member and the extending arm sheet. The door closer according to claim 5, wherein one end block is disposed in the first end of the extension arm duct, and a wear pad is disposed between the extension arm duct and the bidirectional slider, and is worn by a pivoting component. The end block, the extension arm duct and the wear pad are pivotally disposed at the connecting end of the two-way slider; a wear pad for the pivoting member is disposed between the connecting end of the connecting member and the extending arm sheet.