Descent control device for venetian blind

Abstract

The utility model discloses a descent control device for a venetian blind, and aims to provide the descent control device for the venetian blind, which is simple in structure and convenient to assemble. Comprising a shell, the right end of the shell is connected with an outer cover plate, the left end of the shell is connected with a planetary gear set, the left side of the planetary gear set is connected with a friction disc, the right side of the planetary gear set is connected with a square clamp connected with a furling connecting rod, the square clamp is connected with the outer cover plate in a sleeving mode, and the left side of the planetary gear set is provided with a rear cover plate. The friction disc is arranged in the rear cover plate and connected with a friction plate, the friction plate makes contact with the inner side wall of the rear cover plate, and the rear cover plate is connected with the shell in a clamped mode. The utility model has the beneficial effects that the planetary gear set is fixed between the fixing rod and the shell through the connecting buckle on the fixing rod and the connecting clamping groove on the shell, and the connection is convenient and the assembly operation is convenient through a clamping mode.

Description

Technical Field

[0001] The utility model relates to the technical field of Venetian blinds, in particular to a slow - down device for Venetian blinds. Background Art

[0002] The curtain box of the Venetian blind has the functions of retracting and releasing the Venetian blind and adjusting the blades. Among them, to ensure the stable movement state of the curtain blades when they are lowered, and to make their descent speed slow, a slow - down device is usually installed in the curtain box to achieve the slow - down effect of the curtain blades. The existing slow - down devices have complex structures, and are difficult and inconvenient to operate during assembly. Summary of the Utility Model

[0003] The utility model aims to overcome the deficiencies of complex structure and inconvenient assembly in the prior art, and provides a slow - down device for Venetian blinds with a simple structure and convenient assembly.

[0004] To achieve the above purpose, the utility model adopts the following technical scheme: A slow - down device for Venetian blinds includes a housing. The right end of the housing is connected with an outer cover plate. The left end of the housing is connected with a planetary gear set. A friction disc is connected to the left side of the planetary gear set. A square card connected to a retracting link is connected to the right side of the planetary gear set. The square card is sleeved with the outer cover plate. A rear cover plate is arranged on the left side of the planetary gear set. The friction disc is placed inside the rear cover plate. The friction disc is connected with a friction plate. The friction plate contacts the inner side wall of the rear cover plate. The rear cover plate is snap - connected with the housing.

[0005] This device is provided with a housing, an outer cover plate, a planetary gear set and a rear cover plate, among which the outer cover plate is snap - connected to the housing. At the same time, the planetary gear set is placed between the rear cover plate and the housing and is fixed by the snap - connection of the rear cover plate and the housing. A square card is connected to the right end of the planetary gear set, and the square card is connected to a retracting link, where the retracting link is driven to rotate by a rope - winding head. A friction disc is connected to the left end of the planetary gear set. A friction plate is installed on the friction disc. Both the friction disc and the friction plate are placed inside the rear cover plate. When the square card rotates, the rotation action is transmitted to the friction disc through the planetary gear set. When the friction plate rotates, it can generate centrifugal force to throw the friction plate outwards, so that the friction plate contacts and frictions with the rear cover plate to decelerate, realizing the reduction of the rotation speed of the square card, and achieving the slow - down effect when the curtain blades are lowered. In this device, the housing is connected to the outer cover plate and the rear cover plate in a snap - connection form, with a simple structure, making the operation simple and convenient during assembly.

[0006] Preferably, the planetary gear set includes an outer ring gear, a first-stage planetary gear, and a second-stage planetary gear. The first-stage planetary gear and the second-stage planetary gear are connected. The first-stage planetary gear and the second-stage planetary gear are both disposed inside the outer ring gear. A gear slot is provided at the outer end of the first-stage planetary gear. A connecting block is provided on the square card. The connecting block is embedded in the gear slot, and the connecting block and the gear slot are connected by a first torsion spring. The second-stage planetary gear is connected to the friction disc. The first-stage planetary gear and the second-stage planetary gear provided in the planetary gear set are connected by a central gear and are both disposed inside the outer ring gear. Among them, the connecting block provided on the square card is embedded in the gear slot provided on the first-stage planetary gear to complete the clamping connection. The central gear of the second-stage planetary gear is connected to the friction disc, so that the rotation of the square card can drive the friction disc to rotate. Furthermore, when friction deceleration is achieved between the friction disc and the rear cover plate, the deceleration of the square card can be achieved, ensuring the slow descent effect of the curtain blades.

[0007] Preferably, a plurality of groups of parallel fixed pieces are provided on the outer end face of the friction disc. An installation groove is provided on the fixed piece. The friction piece is disposed in the installation groove. The friction piece includes a fixing ring. The fixing ring is connected to the friction disc. The fixing ring is connected with a plurality of friction connecting pieces. The friction connecting pieces are disposed between the fixed pieces. The end of the friction connecting piece is connected with a friction swing piece. The friction swing piece is disposed in the installation groove. Installation grooves are provided at the outer ends of a plurality of fixed pieces provided on the outer end face of the friction disc. The fixing ring provided on the friction piece is sleeved with the convex structure on the friction disc. The outer side wall of the fixing ring is connected with the friction connecting pieces. The friction connecting pieces are clamped between the parallel fixed pieces. The friction swing piece connected to the end of the friction connecting piece is clamped in the installation groove. When the friction disc rotates, the friction swing piece is thrown out under the action of centrifugal force, so that the friction swing piece contacts and rubs against the rear cover plate, thereby achieving the slow descent effect. This structure is simple and convenient for assembly, making the assembly operation simple and convenient.

[0008] Preferably, the rear cover plate is provided with a fixing rod. A connecting buckle is provided at the end of the fixing rod. A connecting slot is provided on the housing. The connecting buckle is clamped with the connecting slot. A fixing rod is provided at the end of the outer cover plate. The connecting buckle provided at the end of the fixing rod can be connected with the connecting slot on the housing to achieve clamping connection, making the operation convenient during assembly and making the assembly operation simple and convenient.

[0009] Preferably, an arc surface is provided on the inner side wall of the fixing rod. The arc surface contacts the outer side wall of the planetary gear set. The arc surface provided on the inner side wall of the fixing rod contacts the outer side wall of the planetary gear set, which can ensure the fixing effect of the fixing rod on the planetary gear set, guarantee the stability of each component after assembly, and at the same time, facilitate the assembly of the components.

[0010] Preferably, the outer shell is provided with a limiting port, and the outer cover plate is provided with a limiting clamping block, and the limiting clamping block is connected to the limiting port. The limiting clamping block of the outer cover plate is embedded into the limiting port of the outer shell to achieve clamping connection, making the assembly operation convenient and simple.

[0011] The beneficial effects of the present utility model are as follows: The planetary gear set is fixed between the connecting buckle on the fixed rod and the connecting slot on the outer shell. The connection is convenient through the form of clamping, facilitating the assembly operation. Among them, a reduction transmission device is formed by the first-stage planetary gear and the second-stage planetary gear. At the same time, a friction disc is connected to the second-stage planetary gear. The centrifugal force generated by the rotation of the friction disc makes the friction swing piece connected to the friction disc contact the inner side wall of the rear cover plate to achieve friction and realize deceleration and slow descent. This structural principle is simple and has a good effect on realizing slow descent. The outer shell and the outer cover plate are connected by a clamping form, which is convenient for fixing the square card connected to the retracting link, ensuring that the rotational power of the retracting link can be stably transmitted to the friction disc through the planetary gear set through the square card, ensuring the slow descent effect. Description of the Drawings

[0012] Figure 1 is a three-dimensional view of the present utility model;

[0013] Figure 2 is an exploded view of the present utility model;

[0014] Figure 3 is a three-dimensional view of the friction disc in the present utility model.

[0015] In the drawings,

[0016] 40. Outer shell, 41. Rear cover plate, 42. Planetary gear set, 43. Friction disc, 44. Square card, 45. Outer cover plate, 46. Friction plate, 400. Limiting port, 401. Connecting slot, 410. Fixed rod, 411. Connecting buckle, 412. Arc surface, 420. Outer ring gear, 421. First-stage planetary gear, 422. Second-stage planetary gear, 423. Gear slot, 430. Fixed piece, 431. Installation groove, 450. Limiting clamping block, 460. Fixed ring, 461. Friction connecting piece, 462. Friction swing piece. Detailed Embodiments

[0017] The following further describes the present utility model in conjunction with the drawings and specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0018] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0019] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the authorized specification. In all the examples shown and discussed herein, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0020] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Without further declaration, the above terms have no special meaning and thus should not be construed as limiting the protection scope of the present application.

[0021] Embodiment 1, as Figures 1 - 3 shown, a speed reducer for a louver curtain includes a housing 40. The right end of the housing 40 is connected to an outer cover plate 45. The left end of the housing 40 is connected to a planetary gear set 42. A friction disc 43 is connected to the left side of the planetary gear set 42. A square card 44 connected to a winding link is connected to the right side of the planetary gear set 42. The square card 44 is sleeved on the outer cover plate 45. A rear cover plate 41 is provided on the left side of the planetary gear set 42. The friction disc 43 is placed inside the rear cover plate 41. The friction disc 43 is connected to a friction plate 46. The friction plate 46 contacts the inner side wall of the rear cover plate 41. The rear cover plate 41 is snap-connected to the housing 40.

[0022] The planetary gear set 42 includes an outer ring gear 420, a first-stage planetary gear 421, and a second-stage planetary gear 422. The first-stage planetary gear 421 and the second-stage planetary gear 422 are connected. The first-stage planetary gear 421 and the second-stage planetary gear 422 are both placed inside the outer ring gear 420. A gear slot 423 is provided at the outer end of the first-stage planetary gear 421. The square card 44 is provided with a connecting block 440. The connecting block 440 is embedded in the gear slot 423, and the connecting block 440 and the gear slot 423 are connected by a first torsion spring. The second-stage planetary gear 422 is connected to the friction disc 43.

[0023] A plurality of groups of parallel fixed pieces 430 are provided on the outer end face of the friction disc 43. The fixed pieces 430 are provided with mounting grooves 431. The friction plates 46 are placed in the mounting grooves 431. The friction plates 46 include a fixing ring 460. The fixing ring 460 is connected with a plurality of friction connecting pieces 461. The friction connecting pieces 461 are placed between the fixed pieces 430. The end of the friction connecting piece 461 is connected with a friction swing piece 462. The friction swing piece 462 is placed in the mounting groove 431.

[0024] The rear cover plate 41 is provided with a fixing rod 410. A connecting buckle 411 is provided at the end of the fixing rod 410. A connecting slot 401 is provided on the outer shell 40. The connecting buckle 411 is clamped with the connecting slot 401.

[0025] An arc surface 412 is provided on the inner side wall of the fixing rod 410. The arc surface 412 is in contact with the outer side wall of the planetary gear set 42.

[0026] The outer shell 40 is provided with a limiting port 400. The outer cover plate 45 is provided with a limiting block 450. The limiting block 450 is connected with the limiting port 400.

[0027] The working principle of the present utility model is as follows: As Figures 1 - 3 shown, an outer shell 40 is provided in the device. An outer cover plate 45 is provided at the right end of the outer shell 40. A planetary gear set 42 is provided at the left end of the outer shell 40. At the same time, a rear cover plate 41 is provided on the left side of the planetary gear set 42.

[0028] Among them, four limiting ports 400 are provided on the outer shell 40. At the same time, four limiting blocks 450 are provided on the outer cover plate 45. The limiting blocks 450 are embedded in the limiting ports 400 to complete the clamping connection between the outer cover plate 45 and the outer shell 40. Among them, a through hole is provided on the outer cover plate 45, and the through hole is used for sleeving the square card 44.

[0029] Among them, the planetary gear set 42 includes an outer ring gear 420, a first-stage planetary gear 421 and a second-stage planetary gear 422. The central gear of the second-stage planetary gear 422 is inserted into the middle of the first-stage planetary gear 421 to complete the gear transmission connection between the two. The first-stage planetary gear 421 and the second-stage planetary gear 422 are both placed inside the outer ring gear 420 to achieve the meshing connection of the gears. A gear slot 423 is provided at the end of the first-stage planetary gear 421, and a connecting block 440 is provided at the inner end of the square card 44. The connecting block 440 is embedded in the gear slot 423. At the same time, a torsion spring one is connected between the connecting block 440 and the gear slot 423. A retracting connecting rod is connected to the outer end of the square card 44. The rotation of the retracting connecting rod can drive the rotation of the first-stage star gear, and then drive the rotation of the second-stage planetary gear 422. The central gear of the second-stage planetary gear 422 is connected to the friction disk 43, and the rotation of the friction disk 43 is realized through the transmission of the planetary gears. Four groups of parallel fixed pieces 430 are provided on the outer end surface of the friction disk 43. An installation groove 431 is provided on the fixed piece 430. A convex ring is provided in the middle of the friction disk 43. The fixing ring 460 provided in the friction plate 46 is sleeved with the convex ring to realize the installation of the friction plate 46. A number of friction connecting pieces 461 are connected to the outer side wall of the fixing ring 460. The friction connecting pieces 461 are embedded between the parallel fixed pieces 430. A friction swing piece 462 is connected to the outer end of the friction connecting piece 461. The friction swing piece 462 is triangular in shape. When the friction disk 43 rotates, due to the action of centrifugal force, the friction swing piece 462 can swing outwards, so that the friction swing piece 462 contacts the inner side wall of the rear cover plate 41 to generate friction. As the rotation speed increases, the friction force also gradually increases, thereby reducing the rotation speed of the square card 44, that is, the slow descent operation can be realized when the curtain descends. At the same time, when the friction disk 43 rotates in the reverse direction, the friction swing piece 462 swings inwards and does not contact the rear cover plate 41 to generate friction, so it does not affect the rising of the curtain.

[0030] Four fixing rods 410 are provided at the end of the rear cover plate 41. The inner wall of the fixing rod 410 is an arc surface 412, and the arc surface 412 contacts the outer ring gear 420. At the same time, a connecting buckle 411 is provided at the end of the fixing rod 410. The connecting buckle 411 is clamped with the connecting slot 401 provided on the housing 40 to complete the connection between the rear cover plate 41 and the housing 40, and realize the fixing of the planetary gear set 42. This connection structure is simple, and during the assembly operation, the operation is simple and convenient.

[0031] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A slow descent device for a louver curtain, characterized in that It includes a housing (40), an outer cover plate (45) is connected to the right end of the housing (40), a planetary gear set (42) is connected to the left end of the housing (40), a friction disc (43) is connected to the left side of the planetary gear set (42), a square card (44) connected to a retracting link is connected to the right side of the planetary gear set (42), the square card (44) is sleeved with the outer cover plate (45), a rear cover plate (41) is arranged on the left side of the planetary gear set (42), the friction disc (43) is placed in the rear cover plate (41), the friction disc (43) is connected with a friction plate (46), the friction plate (46) is in contact with the inner side wall of the rear cover plate (41), and the rear cover plate (41) is snap-connected with the housing (40).

2. The descender for a louver curtain according to claim 1, characterized in that, The planetary gear set (42) includes an outer ring gear (420), a first-stage planetary gear (421) and a second-stage planetary gear (422), the first-stage planetary gear (421) is connected with the second-stage planetary gear (422), both the first-stage planetary gear (421) and the second-stage planetary gear (422) are placed in the outer ring gear (420), a gear slot (423) is arranged at the outer end of the first-stage planetary gear (421), the square card (44) is provided with a connecting block (440), the connecting block (440) is embedded into the gear slot (423), and the connecting block (440) and the gear slot (423) are connected by a first torsion spring, and the second-stage planetary gear (422) is connected with the friction disc (43).

3. The descender for a louver curtain according to claim 1, characterized in that, A plurality of groups of parallel fixed pieces (430) are arranged on the outer end face of the friction disc (43), the fixed pieces (430) are provided with mounting grooves (431), the friction plate (46) includes a fixing ring (460), the fixing ring (460) is connected with the friction disc (43), the fixing ring (460) is connected with a plurality of friction connecting pieces (461), the friction connecting pieces (461) are placed between the fixed pieces (430), the end of the friction connecting piece (461) is connected with a friction swing piece (462), and the friction swing piece (462) is placed in the mounting groove (431).

4. The descender for the louver curtain according to claim 1, characterized in that, The rear cover plate (41) is provided with a fixing rod (410), a connecting buckle (411) is arranged at the end of the fixing rod (410), a connecting slot (401) is arranged on the housing (40), and the connecting buckle (411) is snap-connected with the connecting slot (401).

5. The slow descent device for a louver curtain according to claim 4, characterized in that, An arc surface (412) is arranged on the inner side wall of the fixing rod (410), and the arc surface (412) is in contact with the outer side wall of the planetary gear set (42).

6. The slow descender for a louver curtain according to claim 1, characterized in that, The housing (40) is provided with a limiting port (400), the outer cover plate (45) is provided with a limiting block (450), and the limiting block (450) is connected with the limiting port (400).

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