Buffer

Abstract

The utility model belongs to the technical field of doors and windows, and provides a buffer which comprises a support, a guide wheel assembly, a limiting assembly and a buffer damping assembly. The limiting assembly comprises a shifting block and a swinging block; the shifting block is arranged on the bracket in a sliding manner, and an impact part is arranged on the shifting block; the swing block is rotatably arranged on the shifting block, and a matching position is reserved between the swing block and the impact part; a first elastic element and a limiting structure are arranged between the shifting block and the swinging block; a frame matched with the door and window sash is provided with a fixing piece, and the fixing piece is provided with a blocking part. The buffer damping assembly comprises a second elastic element and a damper, one end of the second elastic element and one end of the damper are fixedly connected with the support, and the other end of the second elastic element and the other end of the damper are connected with the shifting block through a connecting rod. And a locking structure is arranged on the bracket. Butt-joint assembly with the frame can be completed conveniently and quickly, and the installation difficulty can be reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of doors and windows, and particularly relates to a buffer. Background Art

[0002] Side-pressure sliding doors and windows are a type of door and window system that has become more popular in recent years. They push and pull the door and window sashes to move horizontally, thereby opening or closing the door and window sashes. In order to solve the problem of abnormal collisions when the door and window sashes move, it is generally necessary to set a buffer structure to achieve buffered closing of the door and window sashes. For example, the traditional method is to install anti-collision glue on the door and window sashes and the frame. Although this buffer structure is easy to install and has a simple structure, the buffering effect is not good. In order to further solve the buffering problem of door and window sashes, special buffers are more commonly used in the existing technology. However, these special buffers are very troublesome and difficult to assemble with the frame during the initial installation. Moreover, if there is a slight deviation during the assembly process, it will affect the buffering effect of the door and window sashes. Utility Model Content

[0003] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a buffer that can be easily and quickly docked and assembled with a frame, thereby reducing the difficulty of installation.

[0004] The technical solution adopted by the utility model to solve its technical problems is:

[0005] A buffer comprises a bracket, a guide wheel assembly, a limit assembly and a buffer damping assembly; wherein,

[0006] The guide wheel assembly is arranged on the bracket, and the guide wheel assembly is connected to the door and window sash;

[0007] The limiting assembly includes a shift block and a swing block; the shift block can be slidably arranged on the bracket along the translation direction of the door and window sash, and the shift block is provided with a collision part;

[0008] The swing block is rotatably arranged on the shift block, the swing block is located on a side of the impact portion close to the closing side of the door and window sash, and a fitting position is left between the swing block and the impact portion; a first elastic element and a limiting structure are provided between the shift block and the swing block, the elastic force of the first elastic element is used to cause the swing block to rotate and reset, and the limiting structure is used to limit the extreme position of the swing block due to the elastic force of the first elastic element. Under normal circumstances, the swing block is at the extreme position;

[0009] A fixing piece is provided on the frame matched with the door and window sash, and a blocking part is provided on the fixing piece; the blocking part is located on the moving path of the swing block and the impact part;

[0010] The buffer damping assembly includes a second elastic element and a damper, one end of the second elastic element and the damper is fixedly connected to the bracket, and the other end is connected to the shift block through a connecting rod;

[0011] The bracket is provided with a locking structure for locking the limiting assembly.

[0012] The working principle of the above buffer is:

[0013] During initial assembly, the buffer of the present invention is mounted on the door or window sash and connected to the door or window sash via the guide wheel assembly; the fixing member is fixedly mounted on the door or window frame. Then, during docking assembly, the door or window sash is pushed to move the buffer toward the closing side, causing the blocking portion on the fixing member to contact and collide with the swing block, forcing the swing block to rotate, overcoming the elastic force of the first elastic element. This allows the blocking portion to slide past the swing block and enter the mating position between the swing block and the impact portion. After the blocking portion slides past the swing block, the swing block automatically rotates in the opposite direction and resets under the elastic force of the first elastic element, completing the assembly of the buffer.

[0014] In a preferred embodiment of the present invention, the bracket includes two oppositely arranged side panels, both of which are provided with a first sliding groove for the sliding block, and the first sliding groove extends along the translation direction of the door and window sash; both sides of the shift block are provided with a protrusion and a guide portion inserted into the first sliding groove.

[0015] Preferably, the limiting assembly further comprises a connecting head; the connecting head is rotatably connected to the shift block via a first guide pin, and the connecting head is connected to the connecting rod;

[0016] The guide portion includes a first guide portion and a second guide portion; the second guide portion is arranged at a position corresponding to the rotation axis of the swing block; the first guide portion is arranged at a position corresponding to the axis of the first guide pin;

[0017] The end of the first sliding groove close to the closing side is provided with a barb groove; the barb groove constitutes the locking structure.

[0018] Preferably, a notch is provided on the shift block, the swing block is located in the notch, and the swing block is rotatably connected to the shift block via a second guide pin.

[0019] Preferably, a limiting column is provided on the swing block, and a limiting groove is provided on the side of the notch of the shift block, and the limiting column is embedded in the limiting groove; when the swing block rotates, the limiting column slides in the limiting groove; the limiting column and the limiting groove constitute the limiting structure.

[0020] In a preferred embodiment of the present invention, the buffer damping assembly further comprises a sliding shell; the sliding shell can be slidably arranged on the bracket along the translation direction of the door and window sash;

[0021] The sliding housing is provided with a first accommodating cavity, the damper is located in the first accommodating cavity, a blocking cover is provided at one end of the first accommodating cavity away from the limit assembly, the cylinder of the damper is blocked by the blocking cover, and the telescopic rod of the damper passes through the blocking cover and is connected to the bracket;

[0022] The second elastic element is arranged in the sliding shell and is located on the side of the damper away from the door and window sash; one end of the second elastic element close to the limiting assembly is connected to the sliding shell;

[0023] The connecting rod is connected to the sliding shell.

[0024] Preferably, a connecting block is provided at one end of the sliding shell away from the limiting assembly; the connecting block is fixedly connected to the bracket; the end of the second elastic element away from the limiting assembly is connected to the connecting block; and the end of the telescopic rod of the damper away from the limiting assembly is connected to the connecting block.

[0025] Preferably, the second elastic element is connected to a locking block for adjusting the elastic force at one end close to the limiting assembly, and raised limiting portions are provided on both sides of the locking block; multiple anti-slip grooves with openings are provided on both sides of the sliding shell, and the multiple anti-slip grooves on the same side are arranged along the length direction of the sliding shell, and the raised limiting portion is hooked in one group of the anti-slip grooves.

[0026] Preferably, the sliding shell is open at a side away from the door and window sash, and third sliding grooves are provided on both sides of the sliding shell;

[0027] Fourth guide parts are provided on both sides of the positioning block, and the fourth guide parts are correspondingly inserted into the third sliding groove; the positioning block is protruded at one end close to the limiting component to form a bending part.

[0028] In a preferred embodiment of the present invention, the guide wheel assembly includes a base and a first pulley arranged on the base; an avoidance groove is provided on the bracket, and the first pulley is located in the avoidance groove; the base is located on a side of the bracket close to the door and window sash, and the base is connected to the door and window sash and the bracket.

[0029] Compared with the prior art, the beneficial effects of the present invention are:

[0030] During the initial assembly of the buffer of this utility model, the buffer is pushed toward the closing side, causing the blocking portion of the fixing member on the frame to collide with the swing block. This pushes the swing block to rotate, overcoming the elastic force of the first elastic element. The blocking portion then slides smoothly over the swing block into a mating position, completing the docking assembly of the buffer. The swing block automatically rotates in the opposite direction and resets under the elastic force of the first elastic element. The entire assembly process is simple and convenient, with minimal difficulty and requiring no additional steps, greatly facilitating the installation of side-pressure sliding doors and windows.

[0031] At the same time, a limiting structure is provided between the swing block and the shift block of the utility model, which can prevent the swing block from rotating too much under the action of the first elastic element, and is conducive to the swing block remaining in the specified position under normal conditions, ensuring the buffering effect when the door and window sashes are opened and closed. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1 It is a three-dimensional diagram of the buffer and the fixing member of the present invention.

[0034] Figure 2 It is a side view of the buffer of the present invention.

[0035] Figure 3 It is a three-dimensional exploded view of the buffer of the present invention.

[0036] Figure 4 for Figure 3 Exploded view of the center limit assembly.

[0037] Figure 5 It is a three-dimensional diagram of the limiting component.

[0038] Figure 6 A three-dimensional diagram of the buffer damping assembly and the connecting block.

[0039] Figure 7 for Figure 6 A three-dimensional view of the middle card block.

[0040] Figure 8 for Figure 6 Stereoscopic view of the sliding shell.

[0041] Figure 9 A three-dimensional diagram of the bracket.

[0042] Figure 10This is a diagram showing the operation process of the buffer and the fixing parts during initial installation of the utility model.

[0043] Figure 11 This is a diagram showing the action process of the buffer and the fixing parts of the utility model when the door and window sash are opened.

[0044] Figure 12 This is a diagram showing the action process of the buffer and the fixing parts of the utility model when the door and window sash are closed.

[0045] in:

[0046] 1- bracket, 101- side plate, 1011- first chute, 1012- second chute, 1013- avoidance groove, 1014- hook slot;

[0047] 2-guide wheel assembly, 201-base, 202-first pulley;

[0048] 3-limiting assembly, 301-shift block, 3011-first block, 30111-limiting groove, 30112-limiting surface, 30113-cavity, 30114-impact portion, 30115-notch, 30116-recess, 3012-second block, 30121-second guide portion, 302-swinging block, 3021-limiting column, 3022-second guide pin, 303-silencer block, 304-connector, 305-first guide pin, 3051-first guide portion, 306-first elastic element;

[0049] 4 - buffer damping assembly, 401 - sliding housing, 4011 - third guide portion, 4012 - third slide groove, 4013 - anti-slip groove, 4014 - first accommodating chamber, 4015 - second accommodating chamber, 402 - second elastic element, 403 - damper, 4031 - cylinder body, 4032 - telescopic rod, 404 - blocking cover, 405 - positioning block, 4051 - raised limiting portion, 4052 - fourth guide portion, 4053 - bending portion;

[0050] 5-fixing member, 501-blocking part;

[0051] 6-Connecting rod;

[0052] 7-Connection block;

[0053] 8-Second pulley. DETAILED DESCRIPTION

[0054] In order to more clearly understand the above-mentioned purposes, features and advantages of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of this application and the features in the embodiments can be combined with each other. In the following description, many specific details are set forth in order to fully understand the present invention. The embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0055] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0056] Example 1

[0057] See also Figures 1-12 This embodiment discloses a buffer, which has at least the characteristics of easy installation and adjustable elasticity. The buffer includes a bracket 1, a guide wheel assembly 2, a limit assembly 3 and a buffer damping assembly 4.

[0058] The limiting assembly 3 includes a shift block 301, a swing block 302, and a connector 304. The connector 304 is mounted on the shift block 301. The shift block 301 can be slidably mounted on the bracket 1 along the translation direction of the door or window sash. The shift block 301 is provided with a striking portion 30114. The swing block 302 is rotatably mounted on the shift block 301. The swing block 302 is located on the side of the striking portion 30114 close to the closing side of the door or window sash, with a mating position between the swing block 302 and the striking portion 30114. A first elastic element 306 and a limiting structure are disposed between the shift block 301 and the swing block 302. The elastic force of the first elastic element 306 is used to cause the swing block 302 to rotate and reset. The limiting structure is used to limit the extreme position of the swing block 302 due to the elastic force of the first elastic element 306. Under normal circumstances, the swing block 302 is at the extreme position.

[0059] The buffer damping assembly 4 includes a second elastic element 402 and a damper 403 . One end of the second elastic element 402 and the damper 403 is fixedly connected to the bracket 1 , and the other end is connected to the connector 304 on the shift block 301 through a connecting rod 6 .

[0060] The bracket 1 is provided with a locking structure for locking the limiting component 3 so that it is not pulled back by the buffering and damping component 4 .

[0061] The buffer of this embodiment is arranged on the upper side of the door and window sash, and a fixing part 5 is correspondingly provided on the frame matching the door and window sash, and a blocking part 501 is provided on the fixing part 5; the blocking part 501 is located on the moving path of the swing block 302 and the impact part 30114.

[0062] See also Figure 10 During initial assembly, the buffer of this embodiment is connected to the door and window sash via the guide wheel assembly 2; the fixing member 5 is fixedly mounted on the door and window frame. Then, during docking assembly, the buffer can be moved toward the closing side by pushing the door and window sash, causing the blocking portion 501 on the fixing member 5 to contact and collide with the swing block 302, forcing the swing block 302 to rotate against the elastic force of the first elastic element 306. This allows the blocking portion 501 to slide past the swing block 302 and enter the mating position between the swing block 302 and the impact portion 30114. After the blocking portion 501 slides past the swing block 302, the elastic force of the first elastic element 306 causes the swing block 302 to rotate in the opposite direction and reset, completing the assembly of the buffer.

[0063] Furthermore, the bracket 1 of this embodiment includes two oppositely arranged side panels 101, and both side panels 101 are provided with a first sliding groove 1011 for the shift block 301 to slide, and the first sliding groove 1011 extends along the translation direction of the door and window sash; both sides of the shift block 301 are provided with a protrusion and a guide portion inserted into the first sliding groove 1011.

[0064] Furthermore, the connector 304 on the shift block 301 is rotatably connected to the shift block 301 via a first guide pin 305. The connector 304 is connected to the connecting rod 6. The guide portion includes a first guide portion 3051 and a second guide portion 30121. The second guide portion 30121 is positioned corresponding to the rotation axis of the swing block 302, while the first guide portion 3051 is positioned corresponding to the axis of the first guide pin 305. The first guide slot 1011 is provided with a barbed latch 1014 at the end near the closing side. The barbed latch 1014 constitutes a locking mechanism. In this embodiment, the first guide portions 3051 are the ends of the first guide pin 305. The ends of the first guide pin 305 extend through the shift block 301 and are inserted into the corresponding first guide slots 1011, thereby mating with the first guide slots 1011. This guide structure is simple and reliable, guiding the movement of the shift block 301 while also establishing a rotational relationship between the shift block 301 and the connector 304.

[0065] This embodiment utilizes a first sliding groove 1011 and a guide portion to guide the sliding movement of the limit assembly 3 on the bracket 1, resulting in a simple structure. Furthermore, based on this guide structure, a barbed groove 1014 is provided at the end to act as a limiting structure, resulting in an ingenious design and effective results. Specifically, when the door or window sash is opened, the buffer moves toward the opening side with the door or window sash, and the blocking portion 501 on the fixing member 5 blocks the swing block 302. At this time, the limit assembly 3 moves toward the closing side relative to the bracket 1. When the limit assembly 3 moves to the barbed groove 1014, the bracket 1 continues to move toward the opening side. Under the blocking and pushing action of the blocking portion 501, the shift block 301 is forced to rotate around the first guide pin 305, causing the swing block 302 to rotate accordingly, allowing the second guide portion 30121 on the shift block 301 to be embedded in the barbed groove 1014. At this time, the blocking portion 501 can smoothly slide over the swing block 302. Therefore, when the door and window sash continues to move toward the opening side, the damper 403 and the second elastic element 402 of the buffer can maintain the stored energy and continue to move with the door and window sash in the open state until the door and window sash is fully opened. The barbed groove 1014 has a simple structure and can be combined with the first slide groove 1011, which is conducive to locking the position of the limit assembly 3 on the bracket 1.

[0066] To facilitate assembly of the swing block 302 and the shift block 301, a notch 30115 is provided on the shift block 301. The swing block 302 is positioned within the notch 30115 and is rotatably connected to the shift block 301 via a second guide pin 3022. In this embodiment, recesses 30116 are provided within the notch 30115 of the shift block 301. The ends of the second guide pin 3022 are positioned within the recesses 30116, enabling the rotational connection between the swing block 302 and the shift block 301. The second guide portion 30121 in this embodiment is a protruding structure on the shift block 301; however, it can also be designed similarly to the first guide portion 3051, with the second guide pin 3022 passing through the shift block 301 and then inserted into the first guide slot 1011. The choice of design is flexible and depends on actual circumstances.

[0067] To ensure stable and reliable rotation of the swing block 302 under the action of the first elastic element 306 and to limit the position of the swing block 302, a limiting post 3021 is provided on the swing block 302. A limiting groove 30111 is provided on the side of the notch 30115 of the shift block 301, and the limiting post 3021 is embedded in the limiting groove 30111. When the swing block 302 rotates, the limiting post 3021 slides in the limiting groove 30111. The limiting post 3021 and the limiting groove 30111 constitute a limiting structure between the shift block 301 and the swing block 302. Specifically, in this embodiment, two limiting grooves 30111 are provided, one on each side of the notch 30115. Correspondingly, a limiting post 3021 is also provided on both sides of the shift block 301. The limiting grooves 30111 are arc-shaped and match the swing path of the limiting post 3021. The limiting groove 30111 limits the trajectory of the limiting column 3021, thereby limiting the rotation limit position of the swing block 302. On the one hand, it improves the stability of the swing block 302, and on the other hand, it prevents the swing block 302 from escaping from the shift block 301 due to the elastic force of the first elastic element 306.

[0068] Furthermore, the shift block 301 of this embodiment is provided with a limiting surface 30112 at the slot 30115, which can limit the rotation angle of the swing block 302. The limiting surface 30112 cooperates with the limiting structure to further improve the reliability and accuracy of the swing block 302 under normal conditions and during the reset process, thereby preventing it from falling out.

[0069] The shift block 301 of this embodiment is of split type, specifically including a first block 3011 and a second block 3012. The first block 3011 and the second block 3012 have roughly the same shape and structure, and the two are assembled to form the shift block 301. A cavity 30113 is provided at the end of the shift block 301 facing the opening side, and the connector 304 is disposed in the cavity 30113. This embodiment adopts a split shift block 301, which is convenient for assembly and for coordinated installation with the swing block 302 and the connector 304. At the same time, a silencer block 303 is provided at the impact portion 30114 of the shift block 301. The silencer block 303 can reduce or even eliminate the noise when colliding with the blocking portion 501, thereby providing a better experience when assembling and closing the door and window sashes.

[0070] The first elastic element 306 of this embodiment is a torsion spring, which is arranged in the accommodation cavity of the shift block 301. A clearance groove is formed on the side of the swing block 302 facing the notch 30115, and the active end of the torsion spring is located in the clearance groove and abuts against the swing block 302.

[0071] In order to better cooperate with the blocking portion 501 of the fixing member 5, the swing block 302 of this embodiment is tilted toward the closing side, so that when the buffer is initially assembled, the blocking portion 501 can push the swing block 302 more smoothly through the guiding effect of the inclined surface and prompt the swing block 302 to overcome the elastic force of the first elastic element 306 and rotate.

[0072] The buffer damping assembly 4 of this embodiment also includes a sliding housing 401, which can be slidably mounted on the bracket 1 along the translational direction of the door or window sash. The sliding housing 401 defines a first accommodating chamber 4014, within which the damper 403 is located. A blocking cover 404 is provided at the end of the first accommodating chamber 4014 away from the stop assembly 3. The cylinder 6 of the damper 403 is blocked by the blocking cover 404, and the telescopic rod 4032 of the damper 403 passes through the blocking cover 404 and connects to the bracket 1. A second elastic element 402 is disposed within the sliding housing 401 and is located on the side of the damper 403 away from the door or window sash. The end of the second elastic element 402 closest to the stop assembly 3 is connected to the sliding housing 401. A connecting rod 6 is connected to the sliding housing 401 to achieve connection with the damper 403 and the second elastic element 402. Both ends of the connecting rod 6 of this embodiment are provided with threaded structures, and corresponding positions of the connecting head 304 and the sliding shell 401 are also provided with threaded hole structures. The threaded structures are used to achieve a detachable connection, which is convenient for installation and disassembly.

[0073] Furthermore, in this embodiment, both sides of the sliding housing 401 are provided with third guide portions 4011, which are arranged in a raised manner. Second slide grooves 1012 are provided on both sides of the bracket 1, and the third guide portions 4011 are matched and inserted into the second slide grooves 1012, providing guidance and position limiting for the sliding of the sliding housing 401. Furthermore, two third guide portions 4011 are provided on each side of the sliding housing 401, and two second slide grooves 1012 are also provided on each side of the bracket 1. Since the sliding housing 401 has a certain length, the provision of two sets of third guide portions 4011 and second slide grooves 1012 facilitates improved stability.

[0074] A connecting block 7 is provided at one end of the sliding shell 401 away from the limiting assembly 3; the connecting block 7 is fixedly connected to the bracket 1; the end of the second elastic element 402 away from the limiting assembly 3 is connected to the connecting block 7; the end of the telescopic rod 4032 of the damper 403 away from the limiting assembly 3 is connected to the connecting block 7.

[0075] One end of the second elastic element 402 close to the limiting assembly 3 is connected to a locking block 405 for adjusting the elastic force, and raised limiting portions 4051 are provided on both sides of the locking block 405; multiple anti-slip grooves 4013 with openings are provided on both sides of the sliding shell 401, and the multiple anti-slip grooves 4013 on the same side are arranged along the length direction of the sliding shell 401, and the raised limiting portion 4051 is hooked in one group of anti-slip grooves 4013.

[0076] Furthermore, the sliding housing 401 is open on the side away from the door or window sash, and third sliding grooves 4012 are provided on both sides of the sliding housing 401. The locking block 405 is provided with fourth guide portions 4052 on both sides, which are correspondingly inserted into the third sliding grooves 4012. The locking block 405 is provided with a protrusion at one end near the stop assembly 3 to form a lifting portion 4053.

[0077] In the sliding housing 401 of this embodiment, the first accommodating cavity 4014 is provided above the second accommodating cavity 4015 for mounting the second elastic element 402. The second elastic element 402 is a spring. The positioning block 405 and the plurality of anti-slip grooves 4013 are provided to form an elastic force adjustment structure capable of adjusting the elastic force of the second elastic element 402. The specific structure of the anti-slip grooves 4013 is as follows: Figure 6 and Figure 8 As shown. Specifically, the blocking block 405 can be separated from the anti-slip groove 4013 by pushing and utilizing the bent portion 4053 of the blocking block 405, and then the blocking block 405 can be moved to another anti-slip groove 4013 for positioning and fixing, thereby changing the elastic force and energy storage effect of the second elastic element 402, which is simple and convenient to operate. The main purpose of designing the elastic force of the second elastic element 402 to be adjustable in this embodiment is to be able to adjust the buffering effect of the buffer damping assembly 4. The change in elastic force also changes the buffering effect of the second elastic element 402 and the damper 403, so that adaptive adjustment can be made according to the gravity of different door and window sashes or specific usage conditions, so that the buffering effect when the door and window sash is closed is better and smoother, avoiding excessive or insufficient buffering. In addition, the convenient adjustment of the elastic force also makes the user feel better when opening the door and window sash, without having to use too much force to open the door and window sash, and avoiding insufficient buffering.

[0078] The guide wheel assembly 2 of this embodiment is arranged on the bracket 1, and the guide wheel assembly 2 is connected to the door and window sashes to realize the connection between the buffer and the door and window sashes, and drives the buffer to move while the door and window sashes move horizontally, so that the door and window sashes have a buffering and damping effect under the buffering action of the buffer.

[0079] The guide wheel assembly 2 includes a base 201 and a first pulley 202 arranged on the base 201; an avoidance groove 1013 is provided on the bracket 1, and the first pulley 202 is located in the avoidance groove 1013; the base 201 is located on the side of the bracket 1 close to the door and window sash, and the base 201 is connected to the door and window sash and the bracket 1.

[0080] Furthermore, the guide wheel assembly 2 of this embodiment is located between the limit assembly 3 and the buffer damping assembly 4. The connecting rod 6 passes through the base 201, and a second pulley 8 is also provided on the connecting block 7. The second pulley 8 is rotatable. The arrangement of the first pulley 202 and the second pulley 8 makes the movement of the entire buffer on the frame smoother, more stable and reliable.

[0081] See also Figures 1-12 The working principle of the buffer of this embodiment is roughly as follows:

[0082] like Figure 11 As shown, when the door and window sash is opened, the buffer moves toward the opening side along with the door and window sash. Since the blocking portion 501 of the fixing member 5 is located in the matching position between the swing block 302 and the impact portion 30114 in the closed state, the blocking portion 501 on the fixing member 5 blocks the swing block 302. At this time, the limit assembly 3 moves toward the closing side compared to the bracket 1, and pulls the buffer damping assembly 4 to open while the shift block 301 moves, that is, pulls the damper 403 to open during the movement of the shift block 301 and makes the second elastic element 402 in the energy storage state. When the limit assembly 3 moves to the barb slot 1014, the bracket 1 continues to move toward the opening side. Under the blocking and pushing action of the blocking part 501, the shift block 301 is prompted to rotate around the first guide pin 305, so that the swing block 302 also rotates, allowing the second guide part 30121 on the shift block 301 to be embedded in the barb slot 1014 and temporarily locked. At this time, the blocking part 501 can smoothly slide over the swing block 302. Therefore, when the door and window sash continues to move toward the opening side, the damper 403 and the second elastic element 402 of the buffer can continue to move with the door and window sash in the energy storage and open state until the door and window sash is fully opened.

[0083] like Figure 12As shown, when the door or window sash is closed, the door or window sash moves horizontally and closes, driving the buffer to move synchronously toward the closing side. When the buffer moves to the blocking portion 501, the blocking portion 501 first slides over the swing block 302 and then contacts the impact portion 30114 on the shift block 301. As the buffer continues to move toward the closing side, the blocking portion 501 pushes the shift block 301 to rotate in the opposite direction around the first guide pin 305, causing the second guide portion 30121 to disengage from the barb groove 1014. At this time, the entire limit assembly 3 is no longer locked by the locking structure, and the swing block 302 also rotates to its original position along with the shift block 301. At this time, the blocking portion 501 is located in the matching position between the swing block 302 and the impact portion 30114. Next, the damper 403 in the open state acts as a buffer, offsetting the impact force when the door or window sash is closed. Furthermore, under the elastic force of the second elastic element 402 in the stored energy state, the limit assembly 3 moves toward the opening side relative to the bracket 1, causing the swing block 302 to re-engage and block the blocking portion 501. Finally, under the combined action of the second elastic element 402 and the damper 403, the door or window sash slowly moves toward the closing side, achieving a buffered closing of the door or window sash.

[0084] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Therefore, any modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A buffer, characterized in that: It includes a bracket, a guide wheel assembly, a limit assembly and a buffer damping assembly; wherein, The guide wheel assembly is arranged on the bracket, and the guide wheel assembly is connected to the door and window sash; The limiting assembly includes a shift block and a swing block; the shift block can be slidably arranged on the bracket along the translation direction of the door and window sash, and the shift block is provided with a collision part; The swing block is rotatably arranged on the shift block, the swing block is located on a side of the impact portion close to the closing side of the door and window sash, and a fitting position is left between the swing block and the impact portion; a first elastic element and a limiting structure are provided between the shift block and the swing block, the elastic force of the first elastic element is used to cause the swing block to rotate and reset, and the limiting structure is used to limit the extreme position of the swing block due to the elastic force of the first elastic element. Under normal circumstances, the swing block is at the extreme position; A fixing piece is provided on the frame matched with the door and window sash, and a blocking part is provided on the fixing piece; the blocking part is located on the moving path of the swing block and the impact part; The buffer damping assembly includes a second elastic element and a damper, one end of the second elastic element and the damper is fixedly connected to the bracket, and the other end is connected to the shift block through a connecting rod; The bracket is provided with a locking structure for locking the limiting assembly.

2. The buffer according to claim 1, characterized in that The bracket includes two oppositely arranged side plates, both of which are provided with a first sliding groove for the sliding block, and the first sliding groove extends along the translation direction of the door and window sash; both sides of the shift block are provided with a protrusion and a guide portion inserted into the first sliding groove.

3. The buffer according to claim 2, characterized in that The limit assembly further includes a connecting head; the connecting head is rotatably connected to the shift block via a first guide pin, and the connecting head is connected to the connecting rod; The guide portion includes a first guide portion and a second guide portion; the second guide portion is arranged at a position corresponding to the rotation axis of the swing block; the first guide portion is arranged at a position corresponding to the axis of the first guide pin; The end of the first sliding groove close to the closing side is provided with a barb groove; the barb groove constitutes the locking structure.

4. The buffer according to claim 3, characterized in that The shift block is provided with a notch, the swing block is located in the notch, and the swing block is rotatably connected to the shift block through a second guide pin.

5. The buffer according to claim 4, characterized in that The swing block is provided with a limiting column, and the side of the notch of the shift block is provided with a limiting groove, and the limiting column is embedded in the limiting groove; when the swing block rotates, the limiting column slides in the limiting groove; the limiting column and the limiting groove constitute the limiting structure.

6. The buffer according to claim 1, characterized in that The buffer damping assembly further comprises a sliding shell; the sliding shell can be slidably arranged on the bracket along the translation direction of the door and window sash; The sliding housing is provided with a first accommodating cavity, the damper is located in the first accommodating cavity, a blocking cover is provided at one end of the first accommodating cavity away from the limit assembly, the cylinder of the damper is blocked by the blocking cover, and the telescopic rod of the damper passes through the blocking cover and is connected to the bracket; The second elastic element is arranged in the sliding shell and is located on the side of the damper away from the door and window sash; one end of the second elastic element close to the limiting assembly is connected to the sliding shell; The connecting rod is connected to the sliding shell.

7. The buffer according to claim 6, characterized in that A connecting block is provided at one end of the sliding shell away from the limiting assembly; the connecting block is fixedly connected to the bracket; the end of the second elastic element away from the limiting assembly is connected to the connecting block; the end of the telescopic rod of the damper away from the limiting assembly is connected to the connecting block.

8. The buffer according to claim 6 or 7, characterized in that One end of the second elastic element close to the limiting assembly is connected to a locking block for adjusting the elastic force, and raised limiting parts are provided on both sides of the locking block; multiple anti-slip grooves with openings are provided on both sides of the sliding shell, and the multiple anti-slip grooves on the same side are arranged along the length direction of the sliding shell, and the raised limiting part is hooked in one group of the anti-slip grooves.

9. The buffer according to claim 8, characterized in that The sliding shell is open at one side away from the door and window sash, and third sliding grooves are provided on both sides of the sliding shell; Fourth guide parts are provided on both sides of the positioning block, and the fourth guide parts are correspondingly inserted into the third sliding groove; the positioning block is protruded at one end close to the limiting component to form a bending part.

10. The buffer according to claim 1, characterized in that The guide wheel assembly includes a base and a first pulley arranged on the base; an avoidance groove is provided on the bracket, and the first pulley is located in the avoidance groove; the base is located on the side of the bracket close to the door and window sash, and the base is connected to the door and window sash and the bracket.

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