External positioning support arm for door closer

Abstract

The utility model relates to an external positioning support arm for a door closer, comprising a tubular shell, an adjusting screw and a swing arm, one end of the adjusting screw is adjustably screwed to the shell, the other end of the shell is adjustably connected to one end of the swing arm through an adjusting assembly, and a force adjustment assembly that is loosely matched with the adjusting assembly is provided in the shell, the other end of the adjusting screw is provided with a flat head, and a mounting seat is mounted on the flat head through a hinged shaft clamp; the upper and lower planes of the flat head are both provided with wear-resistant plastic washers sleeved outside the hinged shaft, and the two wear-resistant plastic washers are clamped between the flat head and the mounting seat. The adjusting screw and the mounting seat of the utility model are equipped with the flat head, and wear-resistant plastic washers are added on the upper and lower sides of the flat head, so that the mounting seat and the flat head are separated by the wear-resistant plastic washers, even if the wear-resistant plastic washers form plastic-metal contact with the mounting seat and the flat head when the support arm rotates, the noise and friction generated are less, which improves the user experience of the product and also increases its service life.

Description

Technical Field

[0001] The utility model relates to the field of accessories, in particular to an external positioning support arm for a door closer. Background Art

[0002] At present, the support arm structure of the door closer mainly includes a tubular shell, an adjusting screw and a swing arm. One end of the adjusting screw is adjustably screwed to the shell, and the other end of the shell is adjustably connected to one end of the swing arm through an adjusting component. A force adjustment component that matches the adjustment component is provided in the shell. A sleeve is welded to the other end of the adjusting screw. The sleeve is directly hinged to a mounting seat through rivets. The mounting seat is slightly U-shaped, and its inner side faces the upper and lower ends of the sleeve. During the installation of the support arm, there is a height deviation of the mounting seat, which easily causes the inner side of the mounting seat to rub against the end face of the sleeve. At the same time, because the mounting seat and the sleeve are both metal parts, a large noise is generated during friction, which affects the user experience. Moreover, long-term friction will cause the mounting seat or / and the sleeve to wear, affecting the service life of the support arm. In addition, the welding and polishing of the adjusting screw and the sleeve are relatively troublesome. Moreover, during the use of the support arm, the sleeve is subjected to a large impact force. If the welding is not good, it is easy to break. Summary of the invention

[0003] The utility model aims to provide an external positioning support arm for a door closer which has a simple and reasonable structure, is easy to install and has a stable structure.

[0004] An external positioning support arm for a door closer comprises a tubular shell, an adjusting screw and a swing arm, wherein one end of the adjusting screw is adjustably threaded with the shell, the other end of the shell is adjustably connected to one end of the swing arm via an adjusting component, and a force adjusting component which is loosely or tightly matched with the adjusting component is provided in the shell, the other end of the adjusting screw is provided with a flat head, and a mounting seat is mounted on the flat head via an articulated shaft clamp; the upper and lower planes of the flat head are both provided with wear-resistant plastic washers which are sleeved on the outside of the articulated shaft, and the two wear-resistant plastic washers are clamped between the flat head and the mounting seat.

[0005] The purpose of the utility model can also be solved by the following technical measures:

[0006] As a more specific solution, the adjustment assembly includes an adjusting nut, an adjusting plate and a tensioning bolt. The adjusting nut is fixed at one end of the swing arm. The tensioning bolt passes through the shell and the adjustment plate in sequence and is threadedly connected to the adjusting nut to fasten the shell and the adjustment plate between the tensioning bolt and the adjusting nut. The adjustment plate is provided with a force adjustment groove that cooperates with the force adjustment assembly.

[0007] As a further solution, the force adjustment assembly includes an adjusting bolt, a spring and a steel ball which are sequentially arranged in the shell tube cavity. The adjusting bolt is arranged close to one end of the adjusting screw. The steel ball is at least partially exposed outside the tube cavity and forms a loose fit with the force adjustment groove on the adjustment plate through the elasticity of the spring.

[0008] As a further solution, a connecting seat is also provided at the other end of the shell, a countersunk hole is opened on the connecting seat, the adjusting plate is placed on the connecting seat, and a through hole is opened corresponding to the countersunk hole, the tensioning bolt passes through the countersunk hole and the through hole in turn and is threadedly connected with the adjusting nut, and the head of the tensioning bolt is flush with or buried in the countersunk hole.

[0009] As a further solution, the end surface of the adjustment plate close to the swing arm is provided with circumferential teeth along the outer circumference of the through hole, and the end surface of the adjustment nut close to the adjustment plate is provided with annular convex teeth meshing with the circumferential teeth.

[0010] As a further solution, a pin hole is provided on the connecting seat, a limiting pin is connected to the pin hole, and the steel ball is always limited in the tube cavity of the shell by the limiting pin.

[0011] As a further solution, an internal thread is provided in the shell tube cavity, one end of the adjusting screw is provided with an external thread section threadedly connected to the internal thread, and a fixing nut is also threadedly connected to the external thread section of the adjusting screw, and the fixing nut is limited and abutted against one end of the shell.

[0012] As a further solution, an arc-shaped groove is provided on the connecting seat along the axial direction of the shell tube cavity for avoiding the projection range of the tube cavity.

[0013] As a further solution, the mounting base includes a mounting main board, and triangular connecting side plates extend from both sides of the mounting main board, and the wear-resistant plastic washer is clamped between the flat head and the connecting side plates; the wear-resistant plastic washer is made of polyoxymethylene material (POM), and the flat head and the adjusting screw are integrally formed.

[0014] As a further solution, an inner connecting hole is provided on the flat head, and an outer connecting hole is provided at the corner of the connecting side plate corresponding to the inner connecting hole. The hinge shaft is riveted through the outer connecting hole and the inner connecting hole to achieve movable hinge connection between the installation device and the adjusting screw.

[0015] The beneficial effects of the utility model are as follows:

[0016] The adjusting screw of the external positioning arm of this door closer is equipped with a flat head, and wear-resistant plastic washers are added on the upper and lower sides of the flat head, so that the mounting base and the flat head are separated by the wear-resistant plastic washers. Even if the wear-resistant plastic washer forms plastic-metal contact with the mounting base and the flat head when the arm rotates, less noise and friction are generated, which improves the product experience and increases its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 and Figure 2 It is a schematic cross-sectional structure diagram of an embodiment of the utility model.

[0018] Figure 3 and Figure 4 It is a schematic diagram of the exploded structure of an embodiment of the utility model.

[0019] Figure 5 It is a schematic diagram of the exploded structure of the connection between the adjusting screw and the mounting seat in the utility model. DETAILED DESCRIPTION

[0020] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0021] like Figures 1 to 5 As shown, an external positioning support arm for a door closer comprises a tubular shell 1, an adjusting screw 2 and a swing arm 3, one end of the adjusting screw 2 is adjustably threaded with the shell 1, the other end of the shell 1 is adjustably connected to one end of the swing arm 3 through an adjusting component 4, and a force adjusting component 5 which is loosely matched with the adjusting component 4 is provided in the shell 1, the other end of the adjusting screw 2 is provided with a flat head 21, and a mounting seat 6 is clamped on the flat head 21 through a hinge shaft 10; the upper and lower planes of the flat head 21 are provided with wear-resistant plastic washers 7 which are sleeved on the outside of the hinge shaft 10, and the two wear-resistant plastic washers 7 are clamped between the flat head 21 and the mounting seat 6.

[0022] This door closer adds a wear-resistant plastic washer 7 between the adjusting screw 2 and the mounting seat 6, so that the mounting seat 6 and the flat head 21 of the adjusting screw 2 are separated by the wear-resistant plastic washer 7. Even if a certain angle deviation occurs between the mounted and fixed mounting seat 6 and the adjusting screw 2, the wear-resistant plastic washer 7 will be run-in to form a coordinated fit with the mounting seat 6. In addition, due to the contact friction between plastic and metal, the friction force is less and the noise is also lower, making the door opening and closing movement smoother.

[0023] The adjusting assembly 4 includes an adjusting nut 41, an adjusting plate 42 and a tensioning bolt 43. The adjusting nut 41 is fixed to one end of the swing arm 3. The tensioning bolt 43 passes through the housing 1 and the adjusting plate 42 in sequence and is threadedly connected to the adjusting nut 41 to fasten the housing 1 and the adjusting plate 42 between the tensioning bolt 43 and the adjusting nut 41. The adjusting plate 42 is provided with a force adjusting groove 421 that cooperates with the force adjusting assembly 5. When in use, when the swing arm 3 rotates to a certain angle, the adjusting plate 42 also rotates to the same angle. At this time, the force adjusting assembly 5 is embedded in the force adjusting groove 421, thereby realizing the parking function of the door closer.

[0024] The force adjustment component 5 includes an adjustment bolt 51, a spring 52 and a steel ball 53 which are sequentially arranged in the tubular cavity of the shell 1. The adjustment bolt 51 is arranged close to one end of the adjustment screw 2. The steel ball 53 is at least partially exposed outside the tubular cavity and forms a tight fit with the force adjustment groove 421 on the adjustment plate 42 through the elasticity of the spring 52.

[0025] The spring 52 enables the steel ball 53 to be elastically embedded in the force-adjusting groove 421. When the steel ball 53 and the force-adjusting groove 421 are too tight or too loose, the adjusting bolt 51 can be adjusted to change the exposed area of ​​the steel ball 53 outside the tube cavity, so as to adjust the matching strength between the steel ball 53 and the force-adjusting groove 421 and adjust the force of the door closer to open or close.

[0026] The other end of the shell 1 is also provided with a connecting seat 11, and a countersunk hole 111 is opened on the connecting seat 11. The adjusting plate 42 is placed on the connecting seat 11 and a through hole 422 is opened corresponding to the countersunk hole 111. The tensioning bolt 43 passes through the countersunk hole 111 and the through hole 422 in turn and is screwed to the adjusting nut 41, and the head of the tensioning bolt 43 is flush with or buried in the countersunk hole 111; the countersunk hole 111 can bury the head of the adjusting screw 2 in the step surface of the countersunk hole 111, so that the head of the adjusting screw 2 and the bottom surface of the connecting seat 11 maintain a smooth transition, which is more integrated and beautiful.

[0027] In addition, a hexagonal blind hole 431 is recessed in the head of the tension bolt 43, and the tension bolt 43 can be fine-tuned and rotated using a hexagonal key through the hexagonal blind hole 431.

[0028] The end surface of the adjustment plate 42 that is close to the swing arm 3 is provided with circumferential teeth 423 along the outer circumference of the through hole 422, and the end surface of the adjustment nut 41 that is close to the adjustment plate 42 is provided with annular convex teeth 411 that mesh with the circumferential teeth 423; by adjusting the meshing angle between the circumferential teeth 423 and the annular convex teeth 411, the angle of opening or closing the door can be adjusted.

[0029] The connecting seat 11 is provided with a pin hole 112, and the pin hole 112 is connected with a limit pin 8. The steel ball 53 is always limited in the tube cavity of the shell 1 by the limit pin 8; the limit pin 8 can limit the maximum exposed area of ​​the steel ball 53 outside the tube cavity, preventing the steel ball 53 from jumping out of the tube cavity of the shell 1 and causing damage to the support arm.

[0030] An internal thread is provided in the tubular cavity of the shell 1, and one end of the adjusting screw 2 is provided with an external thread section 22 threadedly connected to the internal thread, and a fixing nut 9 is also threadedly connected to the external thread section 22 of the adjusting screw 2, and the fixing nut 9 is limited and abutted against one end of the shell 1; the relative position relationship between the shell 1 and the adjusting screw 2 is locked by tightening the fixing nut 9.

[0031] An arc-shaped groove 113 is provided on the connecting seat 11 along the axial direction of the tube cavity of the shell 1 to avoid the projection range of the tube cavity; through the support of the connecting seat 11, the force adjustment groove 421 on the adjustment plate 42 can be just stuck in the middle position of the steel ball 53 to improve the positioning quality. On the other hand, the arc-shaped groove 113 can make space for the installation of the steel ball 53, so that the steel ball 53 can be installed into the tube cavity of the shell 1 from one side of the connecting seat 11.

[0032] The mounting seat 6 includes a mounting main board 61, and triangular connecting side plates 62 extend from both sides of the mounting main board 61. The wear-resistant plastic gasket 7 is clamped between the flat head 21 and the connecting side plates 62; so that the joints between the flat head 21 and both sides of the mounting seat 6 are provided with wear-resistant plastic gaskets 7.

[0033] The flat head 21 is provided with an inner connecting hole 211, and the connecting side plate 62 is provided with an outer connecting hole 621 at an angle corresponding to the inner connecting hole 211. The hinge shaft 10 passes through the outer connecting hole 621 and the inner connecting hole 211 by riveting, so as to realize the movable hinge connection between the installation device and the adjusting screw 2. The hinge shaft 10 is mainly a rivet, and the connecting seat 11 can be relatively movably connected to the adjusting screw 2 by fixing with the rivet.

[0034] The above is a preferred embodiment of the utility model, which shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. The utility model may have various changes and improvements without departing from the spirit and scope of the utility model, and these changes and improvements fall within the scope of the utility model to be protected, and the scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. An external positioning arm for a door closer, comprising a tubular housing (1), an adjusting screw (2) and a swing arm (3), wherein one end of the adjusting screw (2) is adjustably screwed to the housing (1), the other end of the housing (1) is adjustably connected to one end of the swing arm (3) via an adjusting component (4), and a force adjusting component (5) which is loosely or tightly matched with the adjusting component (4) is provided in the housing (1), characterized in that: The other end of the adjusting screw rod (2) is provided with a flat head (21), and a mounting seat (6) is clamped on the flat head (21) via a hinge shaft (10); the upper and lower planes of the flat head (21) are both provided with wear-resistant plastic washers (7) sleeved on the outside of the hinge shaft (10), and the two wear-resistant plastic washers (7) are clamped between the flat head (21) and the mounting seat (6).

2. The external positioning arm for a door closer according to claim 1, characterized in that: The adjustment assembly (4) comprises an adjustment nut (41), an adjustment plate (42) and a tension bolt (43); the adjustment nut (41) is fixed to one end of the swing arm (3); the tension bolt (43) passes through the housing (1) and the adjustment plate (42) in sequence and is threadedly connected to the adjustment nut (41) so as to fasten the housing (1) and the adjustment plate (42) between the tension bolt (43) and the adjustment nut (41); and the adjustment plate (42) is provided with a force adjustment groove (421) that cooperates with the force adjustment assembly (5).

3. The external positioning arm for a door closer according to claim 2, characterized in that: The force adjustment component (5) comprises an adjustment bolt (51), a spring (52) and a steel ball (53) which are sequentially arranged in the tubular cavity of the housing (1); the adjustment bolt (51) is arranged close to one end of the adjustment screw rod (2); at least a portion of the steel ball (53) is exposed outside the tubular cavity and forms a tight fit with the force adjustment groove (421) on the adjustment plate (42) through the elasticity of the spring (52).

4. The external positioning arm for a door closer according to claim 3, characterized in that: The other end of the housing (1) is further provided with a connecting seat (11), the connecting seat (11) being provided with a countersunk hole (111), the adjusting plate (42) being placed on the connecting seat (11) and having a through hole (422) corresponding to the countersunk hole (111), the tensioning bolt (43) passing through the countersunk hole (111) and the through hole (422) in sequence to be screwed to the adjusting nut (41), and the head of the tensioning bolt (43) being flush with or buried in the countersunk hole (111).

5. The external positioning arm for a door closer according to claim 2, characterized in that: The end surface of the adjustment plate (42) facing the swing arm (3) is provided with circumferential teeth (423) along the outer circumference of the through hole (422), and the end surface of the adjustment nut (41) facing the adjustment plate (42) is provided with an annular convex tooth (411) meshing with the circumferential teeth (423).

6. The external positioning arm for a door closer according to claim 4, characterized in that: The connection seat (11) is provided with a pin hole (112), and a limit pin (8) is connected to the pin hole (112). The steel ball (53) is always limited in the tube cavity of the shell (1) by the limit pin (8).

7. The external positioning arm for a door closer according to claim 1, characterized in that: An internal thread is provided in the tubular cavity of the shell (1); one end of the adjusting screw (2) is provided with an external thread section (22) threadedly connected to the internal thread; a fixing nut (9) is also threadedly connected to the external thread section (22) of the adjusting screw (2); the fixing nut (9) is limitedly abutted against one end of the shell (1).

8. The external positioning arm for a door closer according to claim 4, characterized in that: An arc-shaped groove (113) for avoiding the projection range of the lumen is provided on the connection seat (11) along the axial direction of the lumen of the housing (1).

9. The external positioning arm for a door closer according to claim 1, characterized in that: The mounting seat (6) comprises a mounting main board (61), and triangular connecting side plates (62) extend from both sides of the mounting main board (61). The wear-resistant plastic washer (7) is clamped between the flat head (21) and the connecting side plates (62); the wear-resistant plastic washer (7) is made of polyoxymethylene material, and the flat head (21) and the adjusting screw (2) are integrally formed.

10. The external positioning arm for a door closer according to claim 9, characterized in that: An inner connection hole (211) is formed on the flat head (21), and an outer connection hole (621) is formed at an angle corresponding to the inner connection hole (211) on the connecting side plate (62). The hinge shaft (10) passes through the outer connection hole (621) and the inner connection hole (211) by riveting, thereby realizing movable hinge connection between the mounting device and the adjusting screw rod (2).

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