Middle pulley mechanism with power assisting assembly and heavy lifting sliding door and window

Abstract

The utility model discloses a middle pulley mechanism with a power assisting assembly and a heavy lifting sliding door and window. The middle pulley mechanism is arranged at the bottom of a door and window body and located at the non-end position. Wherein the middle pulley mechanism comprises a first supporting piece, a pulley assembly and a power assisting assembly, and the first supporting piece is connected with the bottom of the door and window body; the pulley assembly is movably matched with the first supporting piece to drive the first supporting piece to ascend and descend. The power assisting assembly comprises a second supporting piece and a first elastic piece, the second supporting piece is connected with the bottom of the door and window body, and the first elastic piece is matched with the second supporting piece and the pulley assembly in an abutting mode to provide pushing force for the pulley assembly so as to assist in lifting of the door and window body. Therefore, when the door and window main body with larger size and heavier weight needs to be lifted, multiple groups of middle pulley mechanisms can be arranged at the bottom of the door and window main body, and the power assisting components in the multiple groups of middle pulley mechanisms can jointly assist power, so that the door and window main body is smoothly lifted without increasing the handle rotating force.

Description

Technical Field

[0001] The utility model relates to the technical field of door and window accessories, and in particular to an intermediate pulley mechanism with a power-assisting component and a heavy-duty lifting and sliding door and window. Background Art

[0002] This section only provides background information related to the present application to help those skilled in the art understand the present application more thoroughly and accurately, and it is not necessarily prior art.

[0003] Most of the sliding doors and windows on the market have poor sealing performance due to the gap between the doors and windows and the frame, and cannot completely isolate the air flow on both sides of the doors and windows, resulting in increased energy consumption for temperature regulation. To this end, liftable doors and windows have appeared on the market. By setting a lifting device at the bottom of the doors and windows, the doors and windows can be lowered and raised as a whole, thereby closing the gap between the doors and windows and the frame and improving air tightness.

[0004] However, in the process of controlling the lifting and lowering of the door or window by turning the handle, since the size of the door or window body is usually designed to be large and heavy, and the entire weight of the door or window body acts on the handle, it is more laborious to operate, which is especially inconvenient for the elderly, children and pregnant women. To this end, patent number CN115506671A discloses a lifting assist structure for heavy-duty lifting sliding doors, which includes a base fixed to the bottom of the sliding door, a pulley assembly slidably connected to the base, a lifting assembly connected to the front end of the pulley assembly, and a lifting assist device arranged at the rear end of the pulley assembly. When the lifting assembly drives the pulley assembly to move in a first direction to drive the base to lift upward in a vertical direction, the lifting assist device can provide a thrust for the pulley assembly to move in the first direction, and then provide a vertical upward supporting force for the base, thereby reducing the force required to rotate the handle when the sliding door is lifted, making the handle more sensitive and labor-saving to rotate.

[0005] However, the above-mentioned booster structure still has the following disadvantages: first, since the booster is arranged at the rear end of the pulley assembly and the booster includes a cylinder connected to the sliding door, the booster will be installed at the rear end of the bottom of the sliding door, resulting in that the rear pulley block can only be installed at the bottom of the sliding door and close to the rear end. Such an arrangement is likely to cause the sliding door to deviate to one side, resulting in an unbalanced force on the entire pulley assembly, which in turn causes one group of pulley blocks to bear a greater load than the other pulley blocks. When the actual load exceeds the rated load of the pulley block, the pulley block will be damaged, and then the load transfer The lifting device is moved to other pulley blocks, causing damage to other pulley blocks, thus affecting the normal use of doors and windows; secondly, since the position of the lifting device is fixed and only one group is provided, when it is necessary to drive the door and window main body with larger size and heavier weight to lift, the lifting device is required to provide greater assistance, and it is difficult to meet the lifting of the assistance simply by replacing the spring with a larger specification and size. At the same time, replacing the spring with a larger specification and size will also make the overall structure of the lifting device larger, thereby increasing the cost; finally, the overall structure of the lifting device is also relatively complex, and the processing difficulty is high, resulting in a high manufacturing cost. Utility Model Content

[0006] In order to overcome the defects described in the above-mentioned prior art, the utility model provides an intermediate pulley mechanism with a power-assisting component and a heavy-duty lifting and sliding door and window, so as to solve the problems in the prior art such as unbalanced force on the pulley group, too little power assistance to meet the lifting of heavy-weight door and window bodies, and complex structure of the power-assisting component.

[0007] The technical solution adopted by the utility model to solve the problem is:

[0008] An intermediate pulley mechanism with a power assist assembly is arranged at the bottom of a door or window body and is located at a non-end position, and comprises:

[0009] A first support member, which is used to connect with the bottom of the door and window body;

[0010] A pulley assembly, which is slidably mounted on the slide rail and movably cooperates with the first support member to drive the first support member to move up and down;

[0011] A power assist assembly, comprising a second support member and a first elastic member, wherein the second support member is used to be connected to the bottom of the door and window body, and the first elastic member is respectively abutted and matched with the second support member and the pulley assembly;

[0012] When the door and window body is in a sinking state, the pulley assembly compresses the first elastic member; when the pulley assembly is driven to move to lift the door and window body, the first elastic member rebounds and provides thrust for the pulley assembly.

[0013] Furthermore, the pulley assembly includes a first connecting block located at the rear end and a profile connected to the first connecting block, the first elastic member is a spring, the spring is sleeved on the profile and one end of the spring abuts against the first connecting block and the other end of the spring abuts against the second support member.

[0014] Furthermore, the power assist assembly also includes a retaining ring which is sleeved on the profile and abuts against the second support member, and a fastener for tightening the profile is passed through the retaining ring.

[0015] Furthermore, the second support member includes a first support plate fixed to the bottom of the door and window body and a second support plate connected to the first support plate and slidably mounted on the profile, one end of the spring abuts against one end of the second support plate, and the retaining ring abuts against the other end of the second support plate.

[0016] Furthermore, it also includes two washers sleeved on the profile, one end of the spring abuts against the first connecting block through one of the washers, and the other end of the spring abuts against the second supporting plate through the other of the washers.

[0017] Furthermore, the pulley assembly also includes a second connecting block that is spaced apart from the first connecting block and located at the front end, two baffles that respectively connect the first connecting block and the second connecting block and clamp the first connecting block and the second connecting block, and two pulleys that are clamped and movably connected in the two baffles and spaced apart, and both pulleys are used to slide on the slide rail.

[0018] Furthermore, it also includes a guide wheel that is clamped and fixedly connected to the two baffles, the first support member is provided with a guide groove, the guide wheel is inserted into the guide groove and can move along the guide groove.

[0019] Furthermore, it also includes a pulley seat connected to the pulley and rotatably arranged on the baffle, and a second elastic member is provided between the pulley seat and the first connecting block, and between the pulley seat and the second connecting block.

[0020] Furthermore, the second elastic member is a spring, wherein:

[0021] The pulley seat is provided with a mounting column, the first connecting block is provided with a first convex column, the spring is respectively sleeved on the mounting column and the first convex column, one end of the spring abuts against the pulley seat, and the other end abuts against the first connecting block;

[0022] The second connecting block is provided with a second convex column, and the spring is respectively sleeved on the mounting column and the second convex column, with one end of the spring abutting against the pulley seat and the other end abutting against the second connecting block.

[0023] In addition, the utility model also provides a heavy-duty lifting and sliding door and window, comprising a first end pulley mechanism, a second end pulley mechanism, a door and window body, a handle control mechanism and at least one set of intermediate pulley mechanisms, wherein:

[0024] The first end pulley mechanism and the second end pulley mechanism are both arranged at the bottom of the door and window body and are located at the front and rear ends respectively, and the first end pulley mechanism and the second end pulley mechanism are both transmission-connected to the middle pulley mechanism;

[0025] The handle control mechanism is transmission-connected with the first end pulley mechanism and drives it to move back and forth, thereby driving the middle pulley mechanism to move back and forth to achieve the lifting or lowering of the door and window body.

[0026] In summary, the intermediate pulley mechanism with a power-assisting component and the heavy-duty lifting and sliding door and window provided by the utility model have the following beneficial effects:

[0027] (1) Since the intermediate pulley mechanism is provided with a power-assisting assembly, the power-assisting assembly can provide thrust for the pulley assembly to drive the pulley assembly to move, thereby reducing the force required for the handle control mechanism to rotate the handle, making the handle rotation more sensitive and labor-saving; in addition, by arranging the power-assisting assembly on the pulley assembly of the intermediate pulley mechanism, the first end pulley mechanism and the second end pulley mechanism can be respectively arranged at the front and rear ends of the bottom of the door and window body, thereby preventing the door and window body from shifting to one side, so that the forces of the multiple pulley mechanisms are balanced, thereby extending the service life of the pulley mechanism and ensuring the normal use of the door and window.

[0028] (2) When it is necessary to lift a door or window body that is larger in size and heavier in weight, multiple sets of intermediate pulley mechanisms can be configured at the bottom of the door or window body. The multiple sets of intermediate pulley mechanisms can not only increase the load-bearing capacity of the door or window body, but also the power-assisting components in the multiple sets of intermediate pulley mechanisms can work together to assist, thereby achieving smooth lifting of the heavier door or window body without increasing the turning force of the handle. In addition, by configuring multiple sets of intermediate pulley mechanisms, there is no need to replace the size of the first elastic member in the power-assisting component, thereby avoiding the increase in cost due to the increase in the overall structure of the power-assisting component.

[0029] (3) The power assist component of the present application is not only simple in structure, low in processing and manufacturing costs, but also easy to assemble and disassemble, and has great promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the structure of the heavy-duty lifting and sliding door and window of the utility model after the frame and the door and window body are hidden;

[0031] Figure 2 This is a schematic diagram of the structure of the middle pulley mechanism in the heavy-duty lifting and sliding door and window of the utility model;

[0032] Figure 3 It is an exploded schematic diagram of the middle pulley mechanism in the heavy-duty lifting and sliding door and window of the utility model;

[0033] Figure 4 This is a schematic diagram of the structure of the intermediate pulley mechanism in the heavy lifting and sliding door and window of the utility model after a baffle is hidden;

[0034] Figure 5 This is a structural schematic diagram of the heavy-duty lifting and sliding door and window of the utility model when the door and window main body is in a sunken state;

[0035] Figure 6 This is a structural schematic diagram of the heavy-duty lifting and sliding door and window of the utility model when the door and window main body is in a lifting state;

[0036] Figure 7 The utility model is a structural schematic diagram of a heavy-duty lifting and sliding door and window in which two sets of intermediate pulley mechanisms are arranged at the bottom of the door and window main body.

[0037] The meanings of the reference numerals are as follows:

[0038] 1. First end pulley mechanism; 2. Second end pulley mechanism; 3. Intermediate pulley mechanism; 31. First support member; 311. Guide groove; 32. Pulley assembly; 321. First connecting block; 322. First profile; 323. Second connecting block; 324. Second profile; 325. Baffle; 326. Pulley; 327. Pulley seat; 328. Guide wheel; 329. Second elastic member; 33. Power assist assembly; 331. Second support member; 3311. First support plate; 3312. Second support plate; 332. First elastic member; 333. Retaining ring; 334. Fastener; 335. Washer; 4. Handle control mechanism; 41. Handle; 42. Transmission; 43. Transmission strip; 5. Door and window body. DETAILED DESCRIPTION

[0039] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0040] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the modules or components referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled 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.

[0042] See also Figure 1-7 The utility model provides a heavy-duty lifting and sliding door and window, including a door and window body 5 and a plurality of pulley groups arranged at the bottom of the door and window body 5, wherein the plurality of pulley groups are used to carry and drive the door and window body 5 to slide. The plurality of pulley groups include a first end pulley mechanism 1 located at the front end, a second end pulley mechanism 2 located at the rear end, and at least one group of intermediate pulley mechanisms 3 located between the first end pulley mechanism 1 and the second end pulley mechanism 2, wherein the first end pulley mechanism 1 and the second end pulley mechanism 2 are both connected to the intermediate pulley mechanism 3 through a profile to achieve transmission matching. In addition, the utility model also includes a handle control mechanism 4 that is transmission-connected to the first end pulley mechanism 1, wherein the handle control mechanism 4 includes a handle 41, a transmission device 42 that matches the output end of the handle 41, and a transmission bar 43 that is connected to the transmission device 42 at one end and connected to the first end pulley mechanism 1 at the other end.

[0043] Therefore, when the handle 41 is rotated, the transmission bar 43 can be driven to move through the transmission device 42, thereby driving the first end pulley mechanism 1, the middle pulley mechanism 3 and the second end pulley mechanism 2 to move in the front-to-back direction so that the door and window body 5 can be switched between the two states of sinking and lifting.

[0044] See also Figure 2-4 The intermediate pulley mechanism 3 includes a first support member 31, a pulley assembly 32 and a power-assisting assembly 33. Preferably, the first support member 31 is a support seat, and the upper end surface of the support seat is fixed to the bottom of the door and window body 5 by screwing; the pulley assembly 32 is slidably arranged on a slide rail (not shown in the figure) and movably cooperates with the support seat to drive the support seat to rise and fall; the power-assisting assembly 33 includes a second support member 331 and a first elastic member 332. The second support member 331 is an L-shaped support block and includes a horizontally arranged first support plate 3311 and a vertically arranged second support plate 3312. The first support plate 3311 is fixed to the bottom of the door and window body 5 by screwing, and the first elastic member 332 is arranged between the second support plate 3312 and the pulley assembly 32 and is respectively abutted and cooperated with the second support plate 3312 and the pulley assembly 32.

[0045] When the door and window body 5 is in a sinking state, the pulley assembly 32 compresses the first elastic member 332 to store potential energy; when the handle 41 is rotated to drive the pulley assembly 32 to move to lift the door and window body 5, the first elastic member 332 rebounds and releases the potential energy to provide thrust for the pulley assembly 32, thereby reducing the rotational force required to rotate the handle 41 and facilitating user operation.

[0046] Since the middle pulley mechanism 3 is provided with a power-assisting assembly 33, the power-assisting assembly 33 can provide thrust for the pulley assembly 32 to drive the pulley assembly 32 to move forward and backward, thereby reducing the rotational force required when the handle control mechanism 4 rotates the handle 41, making the rotation of the handle 41 more sensitive and labor-saving. In addition, by setting the power-assisting assembly 33 on the pulley assembly 32 of the middle pulley mechanism 3, the first end pulley mechanism 1 and the second end pulley mechanism 2 can be respectively set at the front and rear ends of the bottom of the door and window body 5, avoiding the door and window body 5 from deviating to one side, thereby making the forces of multiple pulley mechanisms balanced, extending the service life of the pulley mechanism, and ensuring the normal use of the door and window.

[0047] In addition, when it is necessary to lift a door and window body 5 that is larger in size and heavier in weight, multiple sets of intermediate pulley mechanisms 3 can be configured at the bottom of the door and window body 5, such as Figure 7 As shown. Thus, the multiple sets of intermediate pulley mechanisms 3 can not only increase the load-bearing capacity of the door and window body 5, but also the power-assisting components 33 in the multiple sets of intermediate pulley mechanisms 3 can work together to smoothly lift the heavier door and window body 5 without increasing the rotational force of the handle 41; in addition, by configuring multiple sets of intermediate pulley mechanisms, it is not necessary to change the size of the first elastic member 332 in the power-assisting component 33, thereby avoiding the increase in cost caused by the overall structure of the power-assisting component 33 becoming larger.

[0048] Specifically, the pulley assembly 32 includes a first connection block 321 at the rear end and a first profile 322 connected to the first connection block 321, and the other end of the first profile 322 is connected to the second end pulley mechanism 2 to achieve the transmission connection between the intermediate pulley mechanism 3 and the second end pulley mechanism 2. The second support plate 3312 is provided with a clamping hole and is slidably sleeved on the first profile 322 through the clamping hole; preferably, the first elastic member 332 is a spring, which is sleeved on the first profile 322 and one end of which abuts against the first connection block 321, and the other end of which abuts against the front end of the second support plate 3312.

[0049] In addition, the power assist assembly 33 further includes a retaining ring 333 sleeved on the first profile 322, and the retaining ring 333 is used to abut against the rear end of the second support plate 3312 to position the second support plate 331. A fastener 334 is also provided on the retaining ring 333; preferably, the fastener 334 is a locking screw, and by turning the locking screw, the locking screw can be driven to move and press against the first profile 322 to fix the first profile 322.

[0050] It should be noted that when the intermediate pulley mechanism 3 needs to be assembled to the bottom of the door and window body 5, the spring in the intermediate pulley mechanism 3 needs to be compressed first to store potential energy. The specific operation process is as follows: First, the spring, the second support plate 3312 and the retaining ring 333 are sequentially mounted on the first profile 322 from front to back, and the two ends of the spring are respectively abutted against the front ends of the pulley assembly 32 and the second support plate 3312, and the retaining ring 333 is abutted against the rear end of the second support plate 3312, and then the first profile 322 is pulled backward to drive the pulley assembly 32 to compress the spring. When the spring is fully compressed, the fastener 334 is screwed to tighten the first profile 322 to achieve the pulley assembly. The first support member 31 and the first support plate 3311 in the intermediate pulley mechanism 3 are then fixed to the bottom of the door and window body 5 to complete the assembly and fixation of the intermediate pulley mechanism 3. Finally, the fastener 334 is unscrewed to release the fixation of the pulley assembly 32. When the handle 41 is turned and the pulley assembly 32 is driven to move forward, the spring releases the potential energy and provides a forward thrust to the pulley assembly 32, thereby reducing the rotational force required to rotate the handle 42.

[0051] In this embodiment, the assist assembly 33 further includes two washers 335 sleeved on the first profile 322 , one end of the spring abuts against the first connecting block 321 through a washer 335 , and the other end of the spring abuts against the second support plate 3312 through another washer.

[0052] Furthermore, the pulley assembly 32 further includes a second connection block 323 which is spaced apart from the first connection block 321 and is located at the front end, and a second profile 324 which is connected to the second connection block 323, and the other end of the second profile 324 is connected to the first end pulley mechanism 1 to realize the transmission connection between the intermediate pulley mechanism 3 and the first end pulley mechanism 1. In addition, it also includes two baffles 325 which are respectively connected to the first connection block 321 and the second connection block 323 and clamp the first connection block 321 and the second connection block 323, and two pulleys 326 which are clamped and movably connected to the two baffles 325 and spaced apart, and both pulleys 326 are slidably disposed on the slide rail.

[0053] Furthermore, it also includes a guide wheel 328 that is clamped and fixedly connected to the two baffles 325 . The first support member 31 is provided with a guide groove 311 . The guide wheel 328 is inserted into the guide groove 311 and can move along the guide groove 311 .

[0054] Therefore, when the handle 41 is rotated and the intermediate pulley mechanism 3 is driven to slide forward and backward, since the pulley 326 is slidably arranged on the slide rail, its height position remains unchanged, and the first support member 31 can be driven to move up and down along the height direction through the cooperation between the guide wheel 328 and the guide groove 311, thereby realizing the lifting or sinking of the door and window body 5. Figure 5-6 shown.

[0055] Furthermore, it also includes a pulley seat 327 connected to the pulley 326 and rotatably arranged on the baffle 325, and a second elastic member 329 is arranged between the pulley seat 327 and the first connecting block 321, and between the pulley seat 327 and the second connecting block 323. Specifically, the second elastic member 329 is a spring, a mounting column is arranged on the pulley seat 327, a first protruding column is arranged on the first connecting block 321, the spring is respectively sleeved on the mounting column and the first protruding column, and one end of the spring abuts against the pulley seat 327, and the other end abuts against the first connecting block 321; the second connecting block 323 is provided with a second protruding column, the spring is respectively sleeved on the mounting column and the second protruding column, and one end of the spring abuts against the pulley seat 327, and the other end abuts against the second connecting block 323.

[0056] Therefore, when there is an obstacle in the slide rail where the intermediate pulley mechanism 3 is located or there is a protrusion on the slide rail itself, when the pulley 326 passes through the obstacle or the protrusion, most of the weight of the door and window main body 5 will be applied to the pulley 326, resulting in a greater pressure on the pulley 326, and then subjected to a greater pressure. If the pressure is greater than the initial tension of the second elastic member 329, the second elastic member 329 will deform to cause the pulley 326 and the pulley seat 327 to rotate relative to the baffle 325 to balance the pressure on the pulley 326, thereby reducing the pressure on the pulley 326, preventing the pulley 326 from getting stuck or damaged, and extending the service life of the pulley 326; when the pulley 326 returns to the horizontal track from the obstacle or protrusion (that is, when the force height of the pulley 326 changes), the pulley seat 327 vibrates, and the second elastic member 329 can expand and contract to absorb the energy of the vibration until it returns to its original state, thereby achieving a shock absorbing effect, thereby ensuring the operating stability of the intermediate pulley mechanism 3.

[0057] It should be noted that for the specific structure of the first end pulley mechanism 1 and the second end pulley mechanism 2, reference may be made to a lifting and sliding door and window disclosed in patent number CN116591578A. It is not the focus of the present application, so it will not be described in detail here.

[0058] In summary, the intermediate pulley mechanism with a power-assisting component and the heavy-duty lifting and sliding door and window provided by the utility model have the following beneficial effects:

[0059] (i) Since the intermediate pulley mechanism 3 is provided with a power-assisting assembly 33, the power-assisting assembly 33 can provide thrust for the pulley assembly 32 to drive the pulley assembly 32 to move, thereby reducing the force required for the handle control mechanism 4 to rotate the handle 41, making the rotation of the handle 41 more sensitive and labor-saving; in addition, by arranging the power-assisting assembly 33 on the pulley assembly 32 of the intermediate pulley mechanism 3, the first end pulley mechanism 1 and the second end pulley mechanism 2 can be respectively arranged at the front and rear ends of the bottom of the door and window main body 5, avoiding the door and window main body 5 from shifting to one side, making the forces of the multiple pulley mechanisms balanced, extending the service life of the pulley mechanisms, and ensuring the normal use of the doors and windows.

[0060] (ii) When it is necessary to lift a door or window body 5 that is larger in size and heavier in weight, a plurality of intermediate pulley mechanisms 3 can be arranged at the bottom of the door or window body 5. The plurality of intermediate pulley mechanisms 3 can not only increase the load-bearing capacity of the door or window body 5, but also the power-assisting components 33 in the plurality of intermediate pulley mechanisms 3 can work together to provide power, thereby eliminating the need to increase the force required to rotate the handle 41. In addition, with this arrangement, there is no need to replace the size of the first elastic member 332 in the power-assisting component 33, thereby avoiding the increase in cost due to the increase in the overall structure of the power-assisting component 33.

[0061] (III) The power assist assembly 33 of the present application is not only simple in structure, low in processing and manufacturing cost, but also easy to assemble and disassemble, and has great promotion value.

[0062] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0063] It should be understood that the orientations or positional relationships indicated by the terms "top", "bottom", "inside", "outside", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the modules or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0064] In addition, in the description of the present utility model, "multiple" and "several" mean two or more than two, unless otherwise clearly and specifically defined.

[0065] The technical means disclosed in the solution of the utility model are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical solutions composed of any combination of the above technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model, and these improvements and modifications are also regarded as the protection scope of the utility model.

Claims

1. An intermediate pulley mechanism with a power-assisting assembly, characterized in that: It is configured at the bottom of the door and window body and located at a non-end position, and includes: A first support member, which is used to connect with the bottom of the door and window body; A pulley assembly, which is slidably mounted on the slide rail and movably cooperates with the first support member to drive the first support member to move up and down; A power assist assembly, comprising a second support member and a first elastic member, wherein the second support member is used to be connected to the bottom of the door and window body, and the first elastic member is respectively abutted and matched with the second support member and the pulley assembly; When the door and window body is in a sinking state, the pulley assembly compresses the first elastic member; when the pulley assembly is driven to move to lift the door and window body, the first elastic member rebounds and provides thrust for the pulley assembly.

2. The intermediate pulley mechanism according to claim 1, characterized in that: The pulley assembly includes a first connecting block at the rear end and a profile connected to the first connecting block. The first elastic member is a spring. The spring is sleeved on the profile and one end of the spring abuts against the first connecting block and the other end of the spring abuts against the second supporting member.

3. The intermediate pulley mechanism according to claim 2, characterized in that: The power assist assembly further comprises a retaining ring which is sleeved on the profile and abuts against the second support member, and a fastener for tightening the profile is passed through the retaining ring.

4. The intermediate pulley mechanism according to claim 3, characterized in that: The second support member includes a first support plate fixed to the bottom of the door and window body and a second support plate connected to the first support plate and slidably mounted on the profile, one end of the spring abuts against one end of the second support plate, and the retaining ring abuts against the other end of the second support plate.

5. The intermediate pulley mechanism according to claim 4, characterized in that: It also includes two washers sleeved on the profile, one end of the spring abuts against the first connecting block through one of the washers, and the other end of the spring abuts against the second supporting plate through the other of the washers.

6. The intermediate pulley mechanism according to any one of claims 2 to 5, characterized in that: The pulley assembly also includes a second connecting block spaced apart from the first connecting block and located at the front end, two baffles respectively connecting the first connecting block and the second connecting block and clamping the first connecting block and the second connecting block, and two pulleys movably connected to the two baffles and spaced apart, and both pulleys are used to slide on the slide rail.

7. The intermediate pulley mechanism according to claim 6, characterized in that: It also includes a guide wheel which is clamped and fixedly connected to the two baffles. The first support member is provided with a guide groove. The guide wheel is inserted into the guide groove and can move along the guide groove.

8. The intermediate pulley mechanism according to claim 6, characterized in that: It also includes a pulley seat connected to the pulley and rotatably arranged on the baffle, and a second elastic member is arranged between the pulley seat and the first connecting block, and between the pulley seat and the second connecting block.

9. The intermediate pulley mechanism according to claim 8, characterized in that: The second elastic member is a spring, wherein: The pulley seat is provided with a mounting column, the first connecting block is provided with a first convex column, the spring is respectively sleeved on the mounting column and the first convex column, one end of the spring abuts against the pulley seat, and the other end abuts against the first connecting block; The second connecting block is provided with a second convex column, and the spring is respectively sleeved on the mounting column and the second convex column, with one end of the spring abutting against the pulley seat and the other end abutting against the second connecting block.

10. A heavy-duty lifting and sliding door and window, characterized in that: The invention comprises a first end pulley mechanism, a second end pulley mechanism, a door and window body, a handle control mechanism and at least one set of intermediate pulley mechanisms as claimed in any one of claims 1 to 9, wherein: The first end pulley mechanism and the second end pulley mechanism are both arranged at the bottom of the door and window body and are located at the front and rear ends respectively, and the first end pulley mechanism and the second end pulley mechanism are both transmission-connected to the middle pulley mechanism; The handle control mechanism is transmission-connected with the first end pulley mechanism and drives it to move back and forth, thereby driving the middle pulley mechanism to move back and forth to achieve the lifting or lowering of the door and window body.

Images