CN215830276U - Adjustable pulley gear and sliding door - Google Patents

Abstract

The application relates to an adjustable pulley device and a sliding door and window, wherein the adjustable pulley device comprises a pulley assembly, a positioning pin, a supporting seat and an elastic assembly, a pulley frame in the pulley assembly comprises two first side plates which are oppositely arranged at intervals, a pulley is arranged between the two first side plates, a guide groove is formed in each first side plate, and the guide groove penetrates through each first side plate along the thickness direction of the first side plate; the positioning pin penetrates through the guide groove; two second side plates in the supporting seat are arranged opposite to the two first side plates at intervals respectively, and a clamping groove and an opening part are formed in each second side plate; the elastic component is respectively connected with the pulley yoke and the supporting seat. Adjustable pulley gear in this application just can adjust the holistic height of adjustable pulley gear along first direction relative slip through the pulley yoke in the loose pulley assembly with the supporting seat to the sliding door after the adaptation warp, and the locating pin can enter into the draw-in groove by the opening and supporting seat joint, realize the location between pulley yoke and the support frame, has ensured sliding door's smooth and easy slip.

Description

Adjustable pulley gear and sliding door

Technical Field

The application relates to the technical field of door and window accessories, in particular to an adjustable pulley device and a sliding door and window.

Background

Along with the improvement of life quality, people have higher and higher requirements on living environment, the application of the sliding door and the sliding window in the building is more and more extensive, and the sliding door and the sliding window are matched with large-size glass, so that the indoor lighting can be increased, and the overall appearance of the building can be improved.

However, large size glass is heavy and can easily cause deformation of the door and window assembly after long-term use. The pulley gear in the sliding door among the conventional art all is fixed, is not convenient for adjust after appearing warping, leads to the unable smooth and easy slip of door and window subassembly, influences sliding door's normal use.

SUMMERY OF THE UTILITY MODEL

Therefore, it is necessary to provide an adjustable pulley device and a sliding door, aiming at the problem that the pulley device in the sliding door is inconvenient to adjust.

The embodiment of the application provides an adjustable pulley gear, includes: the pulley assembly comprises a pulley frame and pulleys, the pulley frame comprises two first side plates which are oppositely arranged at intervals, the pulleys are arranged between the two first side plates, guide grooves are formed in the first side plates, and the guide grooves penetrate through the first side plates along the thickness direction of the first side plates; the positioning pin penetrates through the guide groove and can slide along the guide groove; the supporting seat comprises a top plate and two second side plates which are respectively fixed on two opposite sides of the top plate, the two second side plates are respectively arranged opposite to the two first side plates at intervals so that the supporting seat is covered outside the pulley frame, a clamping groove and an opening part communicated with the clamping groove are formed in each second side plate, and the opening part is arranged corresponding to the guide groove; the elastic component is respectively connected with the pulley yoke and the supporting seat so as to enable the pulley yoke and the supporting seat to relatively slide along a first direction; the extending direction of the first guide groove is not perpendicular to the first direction, so that the positioning pin can enter the clamping groove from the opening part and is clamped with the supporting seat in the sliding process of the guide groove.

In one embodiment, each first side plate comprises a first plate body and a second plate body from one end close to the supporting seat to one end far away from the supporting seat, the guide groove is located on the first plate body, the second plate body is provided with a fixing hole, the pulley assembly further comprises a fixing shaft matched with the fixing hole, and the pulley is connected with the second plate body through the fixing shaft.

In one embodiment, the distance between two first plates is smaller than the distance between two opposite second plates.

In one embodiment, the pulley frame further comprises a partition plate arranged between the two first side plates, the partition plate is located at a junction of the first plate body and the second plate body, so that the partition plate and the first plate body jointly enclose a first accommodating cavity, the partition plate and the second plate body jointly enclose a second accommodating cavity, the elastic assembly is at least partially accommodated in the first accommodating cavity and connected with the partition plate, and the pulley is at least partially accommodated in the second accommodating cavity.

In one embodiment, the partition board is provided with an accommodating groove corresponding to the pulley, and the accommodating groove penetrates through the partition board.

In one embodiment, the elastic component comprises an elastic member, two ends of the elastic member are respectively connected with the top plate and the partition plate, and the elastic member can stretch and retract along the first direction.

In one embodiment, the elastic assembly further includes a guide shaft, the partition board is provided with a first through hole, the top plate is provided with a second through hole corresponding to the first through hole, the guide shaft sequentially penetrates through the first through hole and the second through hole, and the elastic member is sleeved outside the guide shaft.

In one embodiment, the number of the elastic members and the number of the guide shafts are two, two first through holes are respectively formed on two sides of the partition board in the length direction, two second through holes are respectively formed on the supporting seat corresponding to the first through holes, the guide shafts are respectively inserted into the corresponding first through holes and the corresponding second through holes, and the elastic members are respectively sleeved outside the guide shafts.

In one embodiment, the opening portion extends through the second side plate along a side of the second side plate adjacent to the pulley frame.

The embodiment of the present application further provides a sliding door, include: such as the adjustable pulley arrangement described above.

Adjustable pulley gear and sliding door based on this application embodiment, adopt elastic component to connect pulley component and supporting seat, just can adjust the holistic height of adjustable pulley gear along first direction relative slip with the supporting seat through the pulley yoke among the pulley component, with the sliding door after the adaptation warp, meanwhile, wear to locate the locating pin in the guide way on the first curb plate and can follow the guide way and slide, and enter into the draw-in groove by the opening on the second curb plate in with the supporting seat joint, realize the location between pulley yoke and the support frame, sliding door's smooth and easy slip has been ensured.

Drawings

Fig. 1 is a schematic overall structural diagram of an adjustable pulley device provided in an embodiment of the present application;

fig. 2 is an exploded view of the overall structure of the adjustable pulley device provided in the embodiment of the present application;

FIG. 3 is a schematic structural view of an adjustable pulley apparatus at an angle according to an embodiment of the present disclosure, wherein the adjustable pulley apparatus is in a first state;

FIG. 4 is a schematic structural view of an adjustable pulley apparatus at another angle according to an embodiment of the present disclosure, wherein the adjustable pulley apparatus is in a first state;

FIG. 5 is a schematic structural view of an adjustable pulley apparatus at an angle according to an embodiment of the present application, wherein the adjustable pulley apparatus is in a second state;

FIG. 6 is a schematic structural view of an adjustable pulley apparatus at another angle according to an embodiment of the present disclosure, wherein the adjustable pulley apparatus is in a second state;

fig. 7 is a simplified schematic diagram of an adjustable pulley apparatus according to an embodiment of the present disclosure in use.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and that modifications may be made by one skilled in the art without departing from the spirit and scope of the application and it is therefore not intended to be limited to the specific embodiments disclosed below.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 to 6, an adjustable pulley apparatus 10 is provided in an embodiment of the present application, where the adjustable pulley apparatus 10 includes a pulley assembly 100, a positioning pin 200, a supporting base 300, and an elastic assembly 400. The pulley assembly 100 is connected to the supporting base 300 through the elastic assembly 400, and the positioning pin 200 is inserted into the pulley assembly 100.

The pulley assembly 100 includes a pulley yoke 110 and a pulley 120, the pulley yoke 110 includes two first side plates 111 disposed at an interval, and the pulley 120 is disposed between the two first side plates 111. The pulley yoke 110 is a main structure for mounting and fixing the pulley 120 and other components in the pulley assembly 100, the structural form of the pulley yoke 110 is not limited, in this embodiment, a mounting space is formed between two first side plates 111 of the pulley yoke 110, and the pulley 120 is disposed in the mounting space and rotatably connected to the pulley yoke 110 through a pin. One side of the pulley frame 110 further has an opening communicating with the installation space, and a portion of the pulley 120 protrudes from the opening to facilitate connection with the door window so that the door window can slide along the pulley 120. The number of the pulleys 120 and the installation position on the pulley frame 110 are not limited. The first side plate 111 is provided with a guide groove 1111a, the guide groove 1111a penetrates through the first side plate 111 along the thickness direction of the first side plate 111, and the guide groove 1111a is used for accommodating the positioning pin 200 and enabling the positioning pin 200 to slide along the guide groove 1111 a. The shape of the guide groove 1111a matches the positioning pin 200, and the number of the guide grooves 1111a, the position of the guide groove 1111a on the first side plate 111, the size of the guide groove 1111a, and the like are not limited. For example, the number of the guide grooves 1111a formed in one first side plate 111 may be one, so as to reduce the difficulty in machining the pulley frame 110. In this embodiment, two guide slots 1111a are disposed on the first side plate 111 at intervals, and correspondingly, the number of the positioning pins 200 is two, and the two positioning slots are respectively disposed through the corresponding guide slots 1111a to increase the fastening degree of the connection between the positioning pins 200 and the first side plate 111. Similarly, in other embodiments, the number of the guide grooves 1111a may be plural.

The positioning pin 200 is inserted into the guide groove 1111a, and the positioning pin 200 can slide along the guide groove 1111 a. Specifically, in this embodiment, the positioning pin 200 passes through the guiding slot 1111a of one first side plate 111, passes through the guiding slot 1111a of the other first side plate 111 after passing through the installation space between the two first side plates 111, and two ends of the positioning pin 200 respectively protrude out of the two first side plates 111, so that the positioning pin 200 can be clamped with the supporting seat 300 in the sliding process, thereby realizing the positioning between the pulley frame 110 and the supporting frame. As described above, the shape, number, etc. of the positioning pins 200 can be flexibly adjusted according to the shape, number, etc. of the guide grooves 1111 a.

The support base 300 is disposed opposite to the pulley assembly 100 and can slide relative to the pulley 120 to adjust the overall height of the adjustable pulley apparatus 10. Specifically, the supporting seat 300 includes a top plate 310 and two second side plates 320 fixed to two opposite sides of the top plate 310, and the two second side plates 320 are spaced from the two first side plates 111, so that the supporting seat 300 is covered outside the pulley frame 110. That is, the distance between the two opposite second side plates 320 is greater than the distance between the two opposite first side plates 111, and the accommodating space defined by the top plate 310 and the two second side plates 320 together can house the pulley assembly 100 therein. The accommodating space does not need to cover the entire pulley assembly 100, but only a portion of the pulley yoke 110 facing the support base 300 may be covered, and the covering range may be flexibly set according to actual use conditions. The second side plate 320 has a slot 321 and an opening 322 communicating with the slot 321, and the opening 322 corresponds to the guide groove 1111 a. The clamping groove 321 is matched with the positioning pin 200 and can play a role in fixing the positioning pin 200, the opening 322 is communicated with the clamping groove 321, the positioning pin 200 can slide in the guide groove 1111a conveniently, and the clamping connection with the support seat 300 is realized in the clamping groove 321 through the opening 322.

The elastic element 400 is connected to the pulley frame 110 and the supporting base 300 respectively, so that the pulley frame 110 and the supporting base 300 can slide relatively along a first direction. The pulley frame 110 is connected to the supporting base 300 by the elastic member 400, and since the elastic member 400 can stretch, the distance between the pulley frame 110 and the supporting base 300 changes along with the stretching of the elastic member 400, that is, the pulley frame 110 and the supporting base 300 slide relatively. The sliding direction between the pulley frame 110 and the supporting seat 300 is set to be the first direction, and in this embodiment, the first direction is set to be parallel to the height direction of the pulley frame 110, so that the height adjustment efficiency between the pulley frame 110 and the supporting seat 300 can be improved. The pulley yoke 110 and the support base 300 are capable of sliding relative to each other not only in the first direction but also in the opposite direction to the first direction. In other embodiments, the first direction may also be along other directions on the pulley frame 110, and will not be described herein.

Based on adjustable pulley gear 10 and sliding door based on this application embodiment, adopt elastic component 400 to be connected pulley component 100 with supporting seat 300, pulley yoke 110 in the pulley component 100 just can adjust the holistic height of adjustable pulley gear 10 with supporting seat 300 along first direction relative slip, with the sliding door after the adaptation warp, meanwhile, the locating pin 200 in the guide way 1111a of wearing to locate on first curb plate 111 can slide along guide way 1111a, and enter into draw-in groove 321 by opening 322 on the second curb plate 320 in with supporting seat 300 joint, realize the location between pulley yoke 110 and the support frame, the smooth and easy slip of sliding door has been ensured.

In order to enable the pulley frame 110 to slide relative to the supporting seat 300 and not affect the normal use of the pulley 120, in one embodiment, each of the first side plates 111 includes a first plate 1111 and a second plate 1112 from an end close to the supporting seat 300 to an end away from the supporting seat 300, the guide groove 1111a is located on the first plate 1111, the second plate 1112 is provided with a fixing hole 1112a, the pulley assembly 100 further includes a fixing shaft 130 engaged with the fixing hole 1112a, and the pulley 120 is connected to the second plate 1112 through the fixing shaft 130. In this way, the guide groove 1111a is formed in the first plate 1111, so that the pulley holder 110 is engaged with the support base 300 through the first plate 1111. The fixing hole 1112a is provided in the second plate 1112, and the pulley 120 is fixed to the second plate 1112 after being coupled to the fixing hole 1112a by the fixing shaft 130. The first plate 1111 and the second plate 1112 do not interfere with each other, so that the pulley 120 can rotate normally and the pulley frame 110 can slide relative to the support base 300. Further, the distance between two first plate bodies 1111 is smaller than the distance between two opposite second plate bodies 1112. Thus, the occupied space of the pulley yoke 110 can be reduced, the size of the whole adjustable pulley device 10 is reduced, the structure is more compact, and the adjustable pulley device can be suitable for more scenes.

Furthermore, the partition 140 may be used to separate the first plate 1111 from the second plate 1112, so as to form relatively independent spaces between the first plate 1111 and the second plate 1112. In one embodiment, the pulley frame 110 further includes a partition 140 disposed between the two first side plates 111, the partition 140 is located at a junction between the first plate 1111 and the second plate 1112, so that the partition 140 and the first plate 1111 jointly enclose a first accommodating cavity 150, the partition 140 and the second plate 1112 jointly enclose a second accommodating cavity 160, the elastic component 400 is at least partially accommodated in the first accommodating cavity 150 and connected to the partition 140, and the pulley 120 is at least partially accommodated in the second accommodating cavity 160. Also, bulkhead 140 on pulley frame 110 also facilitates the connection between pulley frame 110 and bulkhead 140, i.e., resilient assembly 400 may be disposed on bulkhead 140 to connect with pulley frame 110.

In order to further reduce the size of the pulley frame 110, in one embodiment, the partition 140 has a receiving groove 141 corresponding to the pulley 120, and the receiving groove 141 penetrates through the partition 140. Through the arrangement of the accommodating groove 141 corresponding to the pulley 120 on the partition 140, the pulley 120 may protrude from the second accommodating cavity 160 through the accommodating groove 141, which is beneficial to reducing the height of the second accommodating cavity 160, that is, the height of the second plate 1112, and reducing the overall height and center of gravity of the pulley frame 110, so that the overall structure of the adjustable pulley assembly 100 is more stable.

As the elastic element 400 expands and contracts, the distance between the pulley frame 110 and the supporting base 300 changes, i.e., the pulley frame 110 and the supporting base 300 slide relative to each other. Therefore, any member or assembly that has a telescopic function and can change the distance between the pulley frame 110 and the support base 300 may be used as the elastic assembly 400. In one embodiment, the elastic member 400 includes an elastic member 410, two ends of the elastic member 410 are respectively connected to the top plate 310 and the partition plate 140, and the elastic member 410 can extend and contract along the first direction. The elastic member 410 may be a spring used in the art, which is a mechanical part operating by elasticity. The parts made of elastic materials deform under the action of external force, and restore to the original shape after the external force is removed, and are generally made of spring steel. The types of springs are complex and various, and mainly include spiral springs, volute springs, plate springs, special springs and the like according to the shapes. In the present embodiment, the kind, size, etc. of the spring are not limited.

In order to enhance the stability of the spring during expansion and contraction, in one embodiment, the elastic assembly 400 further includes a guide shaft 420, the partition plate 140 is provided with a first through hole 142, the top plate 310 is provided with a second through hole 311 corresponding to the first through hole 142, the guide shaft 420 sequentially penetrates through the first through hole 142 and the second through hole 311, and the elastic member 410 is sleeved outside the guide shaft 420. The guide shaft 420 sequentially penetrates through the first through hole 142 and the second through hole 311, so that the partition plate 140 on the pulley frame 110 can be connected with the top plate 310 on the support base 300, and the elastic member 410 is sleeved outside the guide shaft 420, so that the guide shaft 420 can limit and guide the elastic member 410, the elastic member 410 can stretch along the length direction of the guide shaft 420, and the normal use of the elastic member 410 is ensured. It should be noted that the guide shaft 420 is movably connected with the partition plate 140 and the top plate 310, rather than fixedly connected with each other, so that the partition plate 140 and the top plate 310 can slide relatively along the guide shaft 420, and the height of the adjustable pulley device 10 can be flexibly adjusted.

The number of the elastic members 410 can be flexibly adjusted according to the overall size of the adjustable pulley device 10, in one embodiment, the number of the elastic members 410 and the number of the guide shafts 420 are two, two first through holes 142 are respectively formed on two sides of the partition plate 140 in the length direction, two second through holes 311 are respectively formed on the support base 300 corresponding to the first through holes 142, each guide shaft 420 is respectively inserted into the corresponding first through hole 142 and second through hole 311, and each elastic member 410 is respectively sleeved outside each guide shaft 420. Thus, the two sides of the pulley frame 110 and the support base 300 can slide synchronously and flexibly and uniformly under the action of the pulley assembly 100.

In some embodiments, the positioning pin 200 may be inserted into the opening 322 all the time while being inserted into the guide groove 1111a, so that the positioning pin 200 can be inserted into the slot 321 from the guide groove 1111a through the opening 322. In one embodiment, as shown in fig. 3 to 4, the positioning pin 200 may not be inserted into the opening 322, but the opening 322 may be inserted through the second side plate 320 along a side of the second side plate 320 close to the pulley frame 110. Thus, the positioning pin 200 can penetrate through the second side plate 320 from the opening 322 into the opening 322 while sliding along the guide groove 1111a, and can also enter into the card slot 321 through the opening 322. Compared with the solution that the positioning pin 200 is always inserted into the opening 322, the sliding stroke of the positioning pin 200 in this embodiment is larger, that is, the height adjustment range between the pulley yoke 110 and the supporting seat 300 is wider, and the application range is wider.

Referring to fig. 3 to 4, the adjustable pulley device 10 is in a first state, at this time, the positioning pin 200 is inserted into the guiding groove 1111a and is not engaged with the locking groove 321, the elastic element 400 is in a normal state, i.e., a non-contracting state, the pulley frame 110 is fixedly connected with the supporting seat 300 under the supporting action of the elastic element 400, and the distance between the pulley frame 110 and the supporting seat 300 is relatively far. When the height of the adjustable pulley device 10 needs to be adjusted to reduce the distance between the pulley frame 110 and the support base 300, the support base 300 is pushed along the first direction, so that the elastic component 400 contracts along the first direction, the support base 300 moves along the first direction relative to the pulley frame 110, the distance between the pulley frame 110 and the support base 300 is reduced, and the positioning pin 200 gradually approaches the opening 322. Finally, as shown in fig. 5 to 6, the adjustable pulley device 10 is in the second state, at this time, the positioning pin 200 enters the opening 322, the position of the positioning pin 200 is adjusted to enable the positioning pin 200 to slide along the guiding groove 1111a, the positioning pin 200 can enter the clamping groove 321 from the opening 322 to be clamped with the supporting seat 300, the pulley frame 110 is fixedly connected with the supporting seat 300 under the action of the positioning pin 200, and the distance between the pulley frame 110 and the supporting seat 300 is relatively short. At this time, if the height of the adjustable pulley device 10 needs to be adjusted, the distance between the pulley frame 110 and the supporting seat 300 is increased, the position of the positioning pin 200 can be adjusted to enter the opening 322 and disengage from the engaging groove 321, the elastic element 400 is deformed again, the supporting seat 300 is pushed to move in the opposite direction of the first direction, and the adjustable pulley device 10 can be restored to the first state.

Referring to fig. 7, when the adjustable pulley device 10 is installed and used, it can be used together with a conventional main pulley 120 device 40 without a height adjusting function, the adjustable pulley device 10 and the main pulley 120 device 40 in this embodiment are installed on the guide rail 20 together, the pulley 120 can normally slide along the guide rail 20, and the number and the position relationship between the adjustable pulley device 10 and the main pulley 120 device 40 can be flexibly set according to actual situations. The other side of the main pulley 120 and the other side of the supporting base 300 of the adjustable pulley device 10 away from the pulley frame 110 support the door/window assembly 30 and are fixedly connected to the door/window assembly 30, and at this time, the door/window assembly 30 can slide on the guide rail 20 along with the pulley 120 to realize pushing and pulling. When the sliding door and window assembly is used for a long time and cannot smoothly slide on the guide rail 20 after being deformed, the deformed sliding door and window assembly 30 can be adapted through the height adjustment of the adjustable pulley device 10, so that the sliding door and window assembly 30 can smoothly slide on the guide rail 20 again, and the normal use of the whole sliding door and window is ensured.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. An adjustable pulley apparatus, comprising:

the pulley assembly comprises a pulley frame and pulleys, the pulley frame comprises two first side plates which are oppositely arranged at intervals, the pulleys are arranged between the two first side plates, guide grooves are formed in the first side plates, and the guide grooves penetrate through the first side plates along the thickness direction of the first side plates;

the positioning pin penetrates through the guide groove and can slide along the guide groove;

the supporting seat comprises a top plate and two second side plates which are respectively fixed on two opposite sides of the top plate, the two second side plates are respectively arranged opposite to the two first side plates at intervals so that the supporting seat is covered outside the pulley frame, a clamping groove and an opening part communicated with the clamping groove are formed in each second side plate, and the opening part is arranged corresponding to the guide groove;

the elastic assembly is respectively connected with the pulley yoke and the supporting seat so that the pulley yoke and the supporting seat can relatively slide along a first direction;

the extending direction of the first guide groove is not perpendicular to the first direction, so that the positioning pin can enter the clamping groove from the opening part and is clamped with the supporting seat in the sliding process of the guide groove.

2. The adjustable pulley apparatus according to claim 1, wherein each of the first side plates includes a first plate and a second plate from an end close to the supporting seat to an end away from the supporting seat, the guiding groove is located on the first plate, a fixing hole is formed on the second plate, the pulley assembly further includes a fixing shaft engaged with the fixing hole, and the pulley is connected to the second plate through the fixing shaft.

3. The adjustable pulley apparatus of claim 2, wherein a spacing between two of the first plates is less than a spacing between two opposing second plates.

4. The adjustable pulley apparatus according to claim 2, wherein the pulley frame further comprises a partition plate disposed between the two first side plates, the partition plate is located at a junction between the first plate and the second plate, so that the partition plate and the first plate jointly enclose a first accommodating cavity, the partition plate and the second plate jointly enclose a second accommodating cavity, the elastic member is at least partially accommodated in the first accommodating cavity and connected to the partition plate, and the pulley is at least partially accommodated in the second accommodating cavity.

5. The adjustable pulley device according to claim 4, wherein the partition plate has a receiving groove corresponding to the pulley, and the receiving groove penetrates through the partition plate.

6. The adjustable pulley apparatus of claim 4, wherein the elastic member comprises an elastic member, both ends of the elastic member are respectively connected to the top plate and the partition plate, and the elastic member is capable of extending and retracting in the first direction.

7. The adjustable pulley device according to claim 6, wherein the elastic assembly further comprises a guide shaft, the partition plate is provided with a first through hole, the top plate is provided with a second through hole corresponding to the first through hole, the guide shaft sequentially penetrates through the first through hole and the second through hole, and the elastic member is sleeved outside the guide shaft.

8. The adjustable pulley device according to claim 7, wherein the number of the elastic members and the number of the guide shafts are two, two first through holes are respectively formed on both sides of the partition plate in the length direction, two second through holes are respectively formed on the support seat corresponding to the first through holes, each of the guide shafts is respectively inserted into the corresponding first through hole and the corresponding second through hole, and each of the elastic members is respectively sleeved outside each of the guide shafts.

9. The adjustable pulley apparatus of claim 1, wherein the opening extends through the second side plate along a side of the second side plate adjacent the pulley yoke.

10. A sliding door or window, comprising: an adjustable pulley apparatus as claimed in any one of claims 1 to 9.

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