High-wear-resistance roller shutter head

Abstract

The utility model provides a high wear resistance roller shutter head which comprises a shell, a central shaft body arranged in the shell in a penetrating mode and a gear frame arranged on the central shaft body in a sleeving mode, a metal shaft sleeve is arranged on the central shaft body in a sleeving mode, and an annular groove is formed in the end, close to the shell, of the central shaft body. A limiting baffle ring is arranged at the end, away from the shell, of the gear frame, and the metal shaft sleeve is limited between the annular groove and the limiting baffle ring. Outer protruding blocks are symmetrically arranged in the annular groove, and inner grooves matched with the outer protruding blocks are symmetrically formed in the metal shaft sleeve. The outer circumferential wall of the metal shaft sleeve is sleeved with a plurality of torsional springs in the axial direction. According to the high-wear-resistance roller shutter head, the defect that the service life of an existing roller shutter head is shortened due to the fact that a center shaft body and a limiting block are prone to being abraded is overcome.

Description

Technical Field

[0001] This utility model relates to the field of roller blind heads, and in particular to a roller blind head with high wear resistance. Background Technology

[0002] Among curtain accessories, the roller blind head is an indispensable and important component, used to raise and lower the curtain. For example, patent number CN221462213U discloses a presentable elliptical planetary gear assembly head, in which multiple torsion springs are installed between the central shaft and the gear frame, and the torsion springs are fitted onto the central shaft; the gear frame has openings on both sides in the middle to form limiting grooves, and the two ends of the torsion springs abut against the side walls of the corresponding limiting grooves, and the inner wall of the head cover is provided with limiting blocks corresponding to the limiting grooves.

[0003] In the above structure, the central shaft and the limiting block are both made of plastic, while the torsion spring is made of metal. During use, the torsion spring often grips the central shaft when it acts as a brake, making the central shaft prone to wear. In addition, when the head cover supports the weight of the curtain, the protruding end of the torsion spring abuts against the side wall of the limiting block. The plastic limiting block bears less weight of the curtain, which also makes it prone to wear. After the components wear out, the fitting accuracy of the parts cannot be guaranteed, which will shorten the overall service life of the roller blind head. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] The problem to be solved by this utility model is to provide a roller blind head with high wear resistance, so as to overcome the defects of the existing roller blind head center shaft and limit block being easily worn, resulting in a short service life.

[0006] (II) Technical Solution

[0007] To solve the aforementioned technical problem, this utility model provides a high wear-resistant roller shutter head, comprising a housing, a central shaft passing through the housing, and a gear frame sleeved on the central shaft. A metal bushing is sleeved on the central shaft. An annular groove is provided at one end of the central shaft near the housing, and a limiting ring is provided at the end of the gear frame away from the housing. The metal bushing is positioned between the annular groove and the limiting ring. Symmetrically arranged external protrusions are arranged in the annular groove, and symmetrically arranged internal grooves adapted to the external protrusions are arranged on the metal bushing. Multiple torsion springs are axially fitted on the outer circumferential wall of the metal bushing.

[0008] In some embodiments, the gear frame is symmetrically provided with limiting grooves, and the two protruding ends of the torsion spring abut against the two side walls of the limiting grooves respectively; a head cover is fitted over the gear frame, and a limiting block corresponding to the limiting groove is provided on the inner wall of the head cover, and a metal plate is fitted on the limiting block.

[0009] In some embodiments, slots for inserting the metal plate are symmetrically arranged on both sides of the limiting block, one end of the metal plate is provided with a hook, and one end of the limiting block is provided with a hook groove adapted to the hook.

[0010] In some embodiments, both the metal bushing and the metal plate are made of iron.

[0011] In some embodiments, a ball chain gear and a plurality of reduction gears are installed inside the housing. The central shaft is provided with an external toothed portion at one end of the housing. An internal toothed portion is provided on the inner circumferential wall of the ball chain gear. The plurality of reduction gears are arranged at equal intervals in the circumferential direction between the internal toothed portion and the external toothed portion. The external toothed portion meshes with the reduction gear, and the reduction gear meshes with the internal toothed portion.

[0012] In some embodiments, the gear carrier is provided with a plurality of gear shafts at equal intervals in a ring at one end facing the bead chain gear, and the plurality of gear shafts correspond one-to-one with a plurality of reduction gears, the reduction gears being rotatably mounted on the gear shafts.

[0013] In some embodiments, the gear carrier includes a cover plate that covers one side of the housing, and the gear shaft is disposed on the cover plate; connecting plates are symmetrically arranged on both sides of the cover plate, and the ends of the connecting plates are connected to the limiting rings; the two connecting plates are spaced apart and form a limiting groove, which is used to limit the torsion spring.

[0014] In some embodiments, a fastening screw is installed at one end of the central shaft away from the housing, the fastening screw being threadedly connected to a screw cap, the screw cap being abutted and limited at the end of the headgear.

[0015] (III) Beneficial Effects

[0016] The high wear-resistant roller blind head provided by this utility model has the following advantages compared with the prior art:

[0017] 1) The addition of a metal bushing made of iron provides high strength and good wear resistance. During frequent operation of the roller blind, the torsion spring and the metal bushing are less prone to wear, ensuring the normal operation of the roller blind head and extending its service life. Furthermore, the metal bushing can be precision-machined to achieve high accuracy, allowing for better coordination among the various components inside the roller blind head. When the roller blind is pulled, it ensures that the gear frame, torsion spring, and other components rotate stably around the metal bushing, making the raising and lowering process of the roller blind smoother and preventing jamming or shaking. In addition, iron has a high melting point and good high-temperature resistance. In environments with large temperature variations, the metal bushing will not deform or soften due to temperature increases, maintaining good mechanical properties and ensuring the normal operation of the roller blind head.

[0018] 2) A metal plate is fitted on the limiting block. On the one hand, the metal plate has good wear resistance and the metal plate and the outer protruding end of the torsion spring are not easily worn, which can extend the service life. On the other hand, the use of a metal plate has a greater load-bearing capacity than the traditional plastic limiting block, which can be used for heavier curtains and has a wider range of applications. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a perspective view of a high wear-resistant roller shutter head according to the present invention;

[0021] Figure 2 An exploded view of a high wear-resistant roller shutter head according to this utility model;

[0022] Figure 3 This is a cross-sectional view of a high wear-resistant roller blind head according to the present invention;

[0023] Figure 4 This is a perspective view of the internal structure of a high wear-resistant roller blind head cover according to this utility model;

[0024] Figure 5 This is an exploded view of the high wear-resistant roller shutter head central shaft and metal bushing of this utility model;

[0025] Figure 6 This is a cross-sectional view of a high wear-resistant roller blind head according to this utility model from another perspective;

[0026] Figure 7 This is a perspective view of the connection between the head cover and the metal plate of a high wear-resistant roller shutter according to this utility model;

[0027] Figure 8 This is a perspective view of a high wear-resistant roller shutter head gear frame according to the present invention;

[0028] Figure 9 This is a perspective view of the internal structure of a high wear-resistant roller blind head housing according to this utility model;

[0029] The component names corresponding to the various reference numerals in the figure are as follows: 1. Housing; 2. Central shaft; 201. Outer protrusion; 202. Annular groove; 203. External gear; 3. Gear frame; 301. Limiting ring; 302. Limiting groove; 303. Gear shaft; 304. Cover plate; 305. Connecting plate; 4. Metal bushing; 401. Inner groove; 5. Torsion spring; 501. Outer protrusion; 6. Head cover; 601. Limiting block; 602. Slot; 603. Hook groove; 7. Metal plate; 701. Hook; 8. Bead chain gear; 801. Internal gear; 9. Reduction gear; 10. Fastening screw; 11. Nut. Detailed Implementation

[0030] The present application will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0031] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0032] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this application, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0033] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. The illustrations only show the components related to this application and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0034] Additionally, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that practice can be carried out without these specific details.

[0035] The technical solutions provided by the various embodiments of this application are described below with reference to the accompanying drawings.

[0036] See Figures 1 to 9 This utility model provides a high wear-resistant roller shutter head, including a housing 1, a central shaft 2 passing through the housing 1, and a gear frame 3 sleeved on the central shaft 2. Part of the central shaft 2 is placed inside the housing 1, and the other part is placed outside the housing 1. The gear frame 3 covers one side of the housing 1 and is sleeved on the central shaft 2.

[0037] See Figures 2 to 5 A metal bushing 4 is fitted over the central shaft 2, located between the central shaft 2 and the gear carrier 3. An annular groove 202 is provided at the end of the central shaft 2 closest to the housing 1, and a limiting ring 301 is provided at the end of the gear carrier 3 furthest from the housing 1. The metal bushing 4 is positioned between the annular groove 202 and the limiting ring 301. Symmetrically arranged external protrusions 201 are arranged within the annular groove 202, and symmetrically arranged internal grooves 401 on the metal bushing 4 are provided to fit the external protrusions 201. The external protrusions 201 and the internal grooves 401 cooperate to circumferentially limit the metal bushing 4, restricting its rotation relative to the central shaft 2. Multiple torsion springs 5 ​​are axially fitted onto the outer circumferential wall of the metal bushing 4, and under normal conditions, the torsion springs 5 ​​abut against the outer wall of the metal bushing 4.

[0038] This structure incorporates a metal bushing made of iron, which boasts high strength and excellent wear resistance. During frequent operation of the roller blind, the torsion spring and metal bushing are less prone to wear, ensuring the normal operation of the roller blind head and extending its service life. Furthermore, the metal bushing can be precision-machined to achieve high accuracy, allowing for better coordination among the various components within the roller blind head. When the roller blind is pulled, it ensures stable rotation of the gear frame, torsion spring, and other components around the metal bushing, resulting in a smoother and more stable lifting and lowering process, preventing jamming or wobbling. In addition, iron has a high melting point and excellent high-temperature resistance; in environments with significant temperature variations, the metal bushing will not deform or soften due to temperature increases, maintaining its good mechanical properties and ensuring the normal operation of the roller blind head.

[0039] In some embodiments, such as Figure 3 , Figure 4 , Figure 6 and Figure 7As shown, the gear frame 3 is symmetrically provided with limiting grooves 302, and the two protruding ends 501 of the torsion spring 5 respectively abut against the two side walls of the limiting grooves 302; the gear frame 3 is covered with a head cover 6, and the inner wall of the head cover 6 is provided with a limiting block 601 corresponding to the limiting grooves 302, and a metal plate 7 is fitted on the limiting block 601. Under normal conditions, as the head cover 6 rotates due to the weight of the roller blind itself, the limiting block 601 pushes the outer protruding end 501 of the torsion spring 5, causing the inner diameter of the torsion spring 5 to decrease. This causes the torsion spring 5 to press tightly against the metal bushing 4, thus restricting the rotation of the head cover 6. The limiting block 601 and the outer protruding end 501 are load-bearing parts. In this structure, a metal plate 7 is fitted on the limiting block 601. On the one hand, the metal plate 7 has good wear resistance, and the metal plate 7 and the torsion spring 5 are not easily worn, extending the overall service life. On the other hand, the metal plate 7 has a greater load-bearing capacity than the traditional plastic limiting block, which can be used for heavier curtains and has a wider range of applications.

[0040] In some embodiments, such as Figures 1 to 3 as well as Figure 7 As shown, the limiting block 601 has symmetrical slots 602 on both sides for inserting the metal plate 7, which can limit the metal plate 7. One end of the metal plate 7 is provided with a hook 701, and one end of the limiting block 601 is provided with a hook groove 603 that matches the hook 701. The hook 701 is placed in the hook groove 603 to prevent the metal plate 7 from detaching from the limiting block 601.

[0041] In some embodiments, both the metal bushing 4 and the metal plate 7 are made of iron.

[0042] In some embodiments, such as Figure 2 , Figure 3 and Figure 9 As shown, a ball chain gear 8 and multiple reduction gears 9 are installed inside the housing 1. The ball chain gear 8 is connected to an external ball bearing, and pulling the ball bearing can drive the ball chain gear 8 to rotate. The central shaft 2 is located at one end of the housing 1 and is provided with an external toothed portion 203. An internal toothed portion 801 is provided on the inner circumferential wall of the ball chain gear 8. Multiple reduction gears 9 are arranged at equal intervals in the circumferential direction between the internal toothed portion 801 and the external toothed portion 203. The external toothed portion 203 meshes with the reduction gear 9, and the reduction gear 9 meshes with the internal toothed portion 801.

[0043] In some embodiments, such as Figure 2 , Figure 3 , Figure 8 and Figure 9As shown, multiple gear shafts 303 are arranged in a ring at equal intervals at one end of the gear frame 3 facing the bead chain gear 8. Each gear shaft 303 corresponds to a multiple reduction gear 9, which are rotatably mounted on the gear shaft 303. When the bead chain is pulled, the bead chain gear 8 rotates, which drives the reduction gear 9 to rotate. At the same time, the reduction gear 9 rotates around the central shaft 2, thereby driving the gear frame 3 to rotate. When the gear frame 3 is the driving member, it pushes the outer convex end 501 of the torsion spring 5, making the inner diameter of the torsion spring 5 larger. A gap appears between the torsion spring 5 and the central shaft 2, allowing the gear frame 3, torsion spring 5, and head cover 6 to rotate together, thereby adjusting the height of the roller blind.

[0044] In some embodiments, such as Figure 4 and Figure 8 As shown, the gear frame 3 includes a cover plate 304 that covers one side of the housing 1, and the gear shaft 303 is mounted on the cover plate 304; connecting plates 305 are symmetrically arranged on both sides of the cover plate 304, and the ends of the connecting plates 305 are connected to the limiting retaining rings 301; the two connecting plates 305 are spaced apart and form a limiting groove 302, which is used to limit the torsion spring 5.

[0045] In some embodiments, such as Figure 2 and Figure 3 As shown, a fastening screw 10 is installed at the end of the central shaft 2 away from the housing 1. The fastening screw 10 is threadedly connected to the screw cap 11, and the screw cap 11 is positioned and limited at the end of the head sleeve 6.

[0046] The same or similar parts between the various embodiments in this specification can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments.

[0047] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A high wear-resistant roller shutter head, comprising a housing (1), a central shaft (2) passing through the housing (1), and a gear frame (3) sleeved on the central shaft (2), characterized in that: A metal bushing (4) is fitted over the central shaft (2). An annular groove (202) is provided at one end of the central shaft (2) near the housing (1). A limiting ring (301) is provided at one end of the gear frame (3) away from the housing (1). The metal bushing (4) is limited between the annular groove (202) and the limiting ring (301). An outer protrusion (201) is symmetrically arranged inside the annular groove (202). An inner groove (401) adapted to the outer protrusion (201) is symmetrically arranged on the metal bushing (4). Multiple torsion springs (5) are fitted axially on the outer circumferential wall of the metal bushing (4).

2. The high-wear resistance roller shade head of claim 1, wherein: The gear frame (3) is symmetrically provided with limiting grooves (302), and the two protruding ends (501) of the torsion spring (5) respectively abut against the two side walls of the limiting grooves (302); the gear frame (3) is covered with a head cover (6), and the inner wall of the head cover (6) is provided with a limiting block (601) corresponding to the limiting groove (302), and a metal plate (7) is fitted on the limiting block (601).

3. The high-wear resistance roller shade head of claim 2, wherein: The limiting block (601) has symmetrical slots (602) on both sides for inserting the metal plate (7). One end of the metal plate (7) is provided with a hook (701), and one end of the limiting block (601) is provided with a hook groove (603) that matches the hook (701).

4. The high-wear resistance roller blind head according to claim 2, characterized in that: Both the metal bushing (4) and the metal plate (7) are made of iron.

5. The high-wear resistance roller shade head of claim 1, wherein: The housing (1) is equipped with a ball chain gear (8) and a plurality of reduction gears (9). The central shaft (2) is provided with an external toothed portion (203) at one end of the housing (1). The inner circumferential wall of the ball chain gear (8) is provided with an internal toothed portion (801). The plurality of reduction gears (9) are arranged at equal intervals in the circumferential direction between the internal toothed portion (801) and the external toothed portion (203). The external toothed portion (203) meshes with the reduction gear (9), and the reduction gear (9) meshes with the internal toothed portion (801).

6. The high-wear resistance roller shade head of claim 5, wherein: The gear carrier (3) has a plurality of gear shafts (303) arranged in a ring at equal intervals at one end facing the bead chain gear (8). The plurality of gear shafts (303) correspond one-to-one with a plurality of reduction gears (9), and the reduction gears (9) are rotatably mounted on the gear shafts (303).

7. The high-wear resistance roller shade head of claim 6, wherein: The gear frame (3) includes a cover plate (304) covering one side of the housing (1), and the gear shaft (303) is disposed on the cover plate (304); connecting plates (305) are symmetrically arranged on both sides of the cover plate (304), and the end of the connecting plate (305) is connected to the limiting ring (301); the two connecting plates (305) are spaced apart and form a limiting groove (302), and the limiting groove (302) is used to limit the torsion spring (5).

8. The high-wear resistance roller shade head of claim 2, wherein: A fastening screw (10) is installed at one end of the central shaft (2) away from the housing (1). The fastening screw (10) is threadedly connected to a screw cap (11), which abuts against and limits the end of the headgear (6).

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