Reciprocating rod driving device and curtain system provided with the same

Abstract

This invention relates to a reciprocating pull rod drive device, mainly comprising a housing, a shaft, a drive wheel, a chain, and an operating component. One end of the shaft extends into the housing, the drive wheel is mounted on the shaft, the chain engages with multiple teeth of the drive wheel, and the operating component is connected to the chain and can operate the chain to rotate the drive wheel. The distance between the radial outer edge of the drive wheel and the inner wall of the housing is greater than or equal to the chain thickness, and the number of chain teeth engaging with the drive wheel is less than half the total number of teeth. Therefore, the chain can more easily disengage from the drive wheel and easily reset to pull the drive wheel again, enabling the chain to reciprocate and drive the drive wheel to rotate. This changes the traditional single-engagement action of a long pull rope, significantly reducing chain length and improving operational convenience and safety.

Description

Technical Field

[0001] This invention relates to a reciprocating lever drive device and a curtain system equipped with the device, particularly a manual lever drive device applicable to the unfolding or folding of curtains, tarpaulins, drapes or other soft materials that can be vertically raised or horizontally slid. Background Technology

[0002] The most common curtain systems on the market, whether roller blinds or sliding blinds, are mostly driven by a pull cord to open or close. However, due to the limited movement of the curtains, the pull cord must be long enough; however, such long pull cords can occasionally cause accidents, especially for young children. For example, there are frequent reports of pull cords getting tangled around a child's limbs or neck.

[0003] Taking existing roller blinds as an example, please refer to the following: Figure 1 It is a cross-sectional schematic diagram of an existing roller shutter drive assembly; such as Figure 1 As shown, a sprocket 91 is fitted onto the rolling bar 90, and a beaded chain 92 engages with the sprocket 91. Therefore, the user can drive the rolling bar 90 to rotate clockwise or counterclockwise by pulling the two ends of the beaded chain 92, thereby winding or unwinding the roller blind.

[0004] Furthermore, for example Figure 1 As shown, in order to ensure that the bead chain 92 is tightly engaged with the sprocket 91 and to prevent the bead chain 92 from slipping off the sprocket 91, the gap between the inner wall of the housing 93 and the radial outer edge of the sprocket 91 is usually set to be extremely small, or even almost completely fitted. Therefore, the inner wall of the housing 93 can not only drive the bead chain 92 to fall completely into the tooth groove on the sprocket 91, but also keep the bead chain 92 in the tooth groove of the sprocket 91 throughout the entire driving stroke, preventing the bead chain 92 from falling out of the tooth groove.

[0005] Therefore, it is clear that traditional cord-driven curtain systems cannot shorten the length of the cord, and the safety hazards posed by curtain cords remain. Consequently, the Curtain Manufacturers Association (WCMA) proposed legislation that passed new curtain safety standards, effective in 2019, prohibiting all brick-and-mortar retailers in the United States from selling corded curtains, allowing only cordless curtains (except online stores). However, existing cordless curtains still have drawbacks, such as difficulty in precisely controlling the rolling speed, difficulty in accurately positioning the curtain's coverage area, unsuitability for installation at high heights, lower reliability and lifespan, and relatively higher prices. Summary of the Invention

[0006] The main objective of this invention is to provide a reciprocating pull rod drive device and a curtain system equipped with the device, which can convert traditional pull rope drive into pull rod drive through an innovative mechanism, thereby driving the curtain to rise or slide horizontally in a safer, more reliable, more convenient, and more cost-effective manner.

[0007] To achieve the above objectives, the present invention provides a reciprocating lever drive device, mainly comprising a housing, a shaft, a drive wheel, a chain, and an operating component; wherein, one end of the shaft extends into the housing; the drive wheel is disposed on the shaft and housed within the housing, and the drive wheel includes multiple engaging teeth; the chain engages with the multiple engaging teeth of the drive wheel; the operating component is connected to the chain and adapted to operate the chain to drive the drive wheel to rotate. The distance between the radial outer edge of the drive wheel and the inner wall of the housing is greater than or equal to the thickness of the chain; the number of teeth of the chain engaging with the multiple engaging teeth of the drive wheel is less than or equal to half the total number of teeth of the multiple engaging teeth.

[0008] Therefore, by setting the distance between the radial outer edge of the drive wheel and the inner wall of the housing to be greater than or equal to the thickness of the chain, the chain can easily disengage from the drive wheel and reset. Furthermore, the present invention sets the number of teeth of the multiple engagement teeth of the chain engaging the drive wheel to be less than half the total number of teeth of the multiple engagement teeth, that is, reducing the number of teeth of the chain engaging the drive wheel. This allows the chain to more easily and completely disengage from the drive wheel, and can also easily reset and pull the drive wheel again, so that the chain forms a reciprocating motion, changing the traditional single engagement action of a long pull rope. Therefore, the chain length can be significantly shortened, and the ease of operation and safety can be significantly improved.

[0009] To achieve the above objectives, the present invention provides a curtain system equipped with a reciprocating rod drive device, mainly comprising a reciprocating rod drive device and a curtain fabric; wherein, the curtain fabric is selectively wound onto or released from the rod by the reciprocating rod drive device. In other words, the aforementioned reciprocating rod drive device can be configured for vertically lifting roller blinds, and the present invention is not limited to curtains; other roller blinds, drapes, or other equivalent soft materials are also applicable to the present invention.

[0010] To achieve the above objectives, the present invention provides a curtain system with a reciprocating pull rod drive device, mainly comprising a horizontal guide rail, at least one sliding member, a pull cord, at least one curtain fabric, and a reciprocating pull rod drive device; wherein, the pull cord is wound around the shaft of the reciprocating pull rod drive device; the reciprocating pull rod drive device is adapted to pull the pull cord via the shaft, thereby driving at least one sliding member to pull at least one curtain fabric horizontally. In other words, the aforementioned reciprocating pull rod drive device can also be configured in horizontally opening curtains, drapes, or canopy systems, and the present invention is applicable regardless of whether it is a single horizontal opening or a double horizontal opening. Attached Figure Description

[0011] Figure 1This is a cross-sectional schematic diagram of an existing roller shutter drive assembly.

[0012] Figure 2 This is a perspective view of the first embodiment of the reciprocating lever drive device of the present invention applied to a roller blind system.

[0013] Figure 3A This is a cross-sectional schematic diagram of the first embodiment of the reciprocating tie rod drive device of the present invention in a stationary state.

[0014] Figure 3B This is a cross-sectional schematic diagram of the first embodiment of the reciprocating tie rod drive device of the present invention in operation.

[0015] Figure 4 This is a side view of the limiting member and the stop member of the first embodiment of the reciprocating tie rod drive device of the present invention.

[0016] Figure 5 This is a cross-sectional schematic diagram of a second embodiment of the reciprocating tie rod drive device of the present invention.

[0017] Figure 6 This is a cross-sectional schematic diagram of the third embodiment of the reciprocating tie rod drive device of the present invention.

[0018] Figure 7A This is a perspective view of the chain support assembly and drive wheel in the third embodiment of the reciprocating lever drive device of the present invention.

[0019] Figure 7B This is an exploded view of the chain support assembly and drive wheel in the third embodiment of the reciprocating lever drive device of the present invention.

[0020] Figure 8A yes Figure 7A The cross-sectional view of line segment AA shows the reciprocating tie rod drive device in a stationary state.

[0021] Figure 8B yes Figure 7A The cross-sectional view of line segment AA shows the reciprocating tie rod drive device in operation.

[0022] Figure 9A This is a partially enlarged cross-sectional view of the chain support assembly and drive wheel in the fourth embodiment of the reciprocating lever drive device of the present invention.

[0023] Figure 9B This is a partially enlarged cross-sectional view of the chain support assembly and drive wheel in the fifth embodiment of the reciprocating lever drive device of the present invention.

[0024] Figure 10A This is a perspective view of the sixth embodiment of the reciprocating tie rod drive device of the present invention.

[0025] Figure 10B This is a perspective view of the sixth embodiment of the reciprocating tie rod drive device of the present invention after the housing has been removed.

[0026] Figure 10C This is a perspective view of the chain support assembly and drive wheel in the sixth embodiment of the reciprocating lever drive device of the present invention.

[0027] Figure 11A This is a perspective view of the chain support assembly and drive wheel in the seventh embodiment of the reciprocating lever drive device of the present invention.

[0028] Figure 11B This is a schematic diagram of the seventh embodiment of the reciprocating pull rod drive device of the present invention applied to a horizontal double-opening curtain system.

[0029] Figure 12 This is a schematic diagram of the first embodiment of the reciprocating lever drive device of the present invention applied to another roller blind system. Detailed Implementation

[0030] Before the reciprocating rod drive device and curtain system equipped with the device of the present invention are described in detail in this embodiment, it should be noted that similar components will be indicated by the same reference numerals in the following description. Furthermore, the accompanying drawings of the present invention are for illustrative purposes only and are not necessarily drawn to scale, and not all details may be shown in the drawings.

[0031] Please also refer to Figure 2 , Figure 3A and Figure 3B , Figure 2 This is a perspective view of the first embodiment of the reciprocating lever drive device of the present invention applied to a roller blind system. Figure 3A This is a cross-sectional schematic diagram of the first embodiment of the reciprocating tie rod drive device of the present invention in a static state. Figure 3B This is a cross-sectional schematic diagram of the first embodiment of the reciprocating lever drive device of the present invention in operation. As shown in the figure, the reciprocating lever drive device 1 of this embodiment mainly includes a fixed frame F, a housing C, a shaft R, a drive wheel 2, a chain 3, and an operating component 4.

[0032] A mounting bracket F is installed on a wall (not shown in the figure), and a housing C is installed on the mounting bracket F. The housing C includes two openings C1, which are located on two corresponding sides. A shaft R is pivotally mounted on the mounting bracket F, and one end of the shaft R extends into the housing C. The portion of the shaft R exposed outside the housing C is used to wind the curtain S. Specifically, in this embodiment, the shaft R is a shaft R with built-in rotational damping. That is, once the shaft R is rotated by an external force, the internal damping of the shaft R will prevent the shaft R from rotating due to the weight of the curtain S. Additionally, a drive wheel 2 is located at one end of the shaft R and housed within the housing C. The drive wheel 2 includes multiple engaging teeth 21. A chain 3 engages with the multiple engaging teeth 21 of the drive wheel 2. An operating component 4 is connected to the chain 3 and is adapted to operate the chain 3 to drive the drive wheel 2 to rotate.

[0033] The operating component 4 in this embodiment mainly includes two sleeves 41, two pull rods 42, two springs 43, a connector 45, an elastic reset member 46, and two baffles 47. The two pull rods 42 are respectively connected to both ends of the chain 3, and the two sleeves 41 are also respectively fitted onto both ends of the chain 3. The two springs 43 and the two baffles 47 are respectively housed within the two sleeves 41. Each sleeve 41 has a step portion 405, and the baffle 47 abuts against the step portion 405 of the sleeve 41. One end of each spring 43 abuts against the sleeve 41, and the other end abuts against the baffle 47. Moreover, each baffle 47 has a through hole 470, through which the chain 3 passes. In addition, the connector 45 can be a plate or a rod, with both ends connected to the two sleeves 41, and both ends of the elastic reset member 46 are respectively connected to the connector 45 and the housing C. The elastic reset member 46 is used to apply a bias pressure to the connector 45, causing it to approach the housing C. In this embodiment, the chain 3 is a beaded chain, but the present invention is not limited thereto; belts or other equivalent power transmission components may also be used.

[0034] The following describes the operation method of this embodiment: Please refer to the following first. Figure 3A In the stationary state, that is, when the drive wheel 2 is not rotating, the number of teeth of the chain 3 engaging with the drive wheel 2 on the plurality of engaging teeth 21 is less than one-third of the total number of teeth of the engaging teeth 21; and the distance d between the radial outer edge of the drive wheel 2 and the inner wall of the top surface of the housing C is greater than the thickness t of the chain 3. When the user wants to wind up the curtain S, he only needs to pull the right-side lever 42, such as Figure 3BAs shown, at this time, the pull rod 42 pulls the chain 3, which descends through the through hole 470 of the baffle 47. The chain 3 then drives the drive wheel 2 to rotate clockwise, while the shaft R winds the curtain S. Furthermore, the other end of the chain 3 pulls the pull rod 42 on the other side, causing the pull rod 42 and the baffle 47 to rise and compress the spring 43, thereby accumulating a restoring force. Simultaneously, the two sleeves 41 and the connecting piece 45 will also be lowered by force. At this time, the number of teeth of the chain 3 engaged with the drive wheel 2 is still less than half the total number of teeth of the engaging teeth 21. That is to say, the number of teeth of the chain 3 engaged with the drive wheel 2 is more than in the stationary state, so the power transmission will be more reliable, and the chain 3 is less likely to slip off the drive wheel 2.

[0035] Next, if it is still necessary to continue winding the curtain S, the user only needs to release the pull rod 42. At this time, the elastic reset member 46 will assist in pulling the sleeve 41, pull rod 42 and connector 45 back to their original positions, and the chain 3 will automatically slip out of the engaging teeth 21 of the drive wheel 2. At the same time, the compressed spring 43 in the sleeve 41 releases its elastic force and pushes the chain 3 back to its original position, restoring it to its original state. Figure 3A As shown. That is, in this embodiment, after the lever 42 is pulled down and released, it will automatically reset, without the user needing to manually move the lever 42 up to reset it. Furthermore, the user only needs to pull the lever 42 down again, as described above, to make the device appear as shown. Figure 3B Once the curtain S is in this state, the shaft R can be pulled again to wind the curtain S. By continuously repeating this action, the curtain S can be wound continuously. On the other hand, if it is necessary to release the curtain S, simply pull the other lever 42 and perform the aforementioned action procedure to continuously release the curtain S.

[0036] Overall, in this embodiment, the distance d between the radial outer edge of the drive wheel 2 and the inner wall of the top surface of the housing C is set to be greater than the thickness t of the chain 3, so that the chain 3 can completely disengage from the drive wheel 2 and achieve reciprocating motion. In addition, when the drive wheel 2 is not driven, this embodiment sets the number of teeth of the chain 3 engaged with the drive wheel 2 to be less than one-third of the total number of teeth of the engaging teeth, that is, reduces the number of teeth of the chain 3 engaged with the drive wheel 2. This allows the chain 3 to disengage from the drive wheel 2 more easily and to easily reset and pull the drive wheel 2 again, so that the chain 3 can form a reciprocating motion.

[0037] Please also refer to Figure 2 and Figure 4 , Figure 4This is a side view of the limiting member and the stop member of the first embodiment of the reciprocating pull rod drive device of the present invention. As shown in the figure, a limiting member F1 is provided on one side of the fixed frame F, and a stop member S1 is provided on the lower side of the curtain S. When the curtain S is wound on the shaft R, and the stop member S1 abuts against the limiting member F1, the limiting member F1 will lock the stop member S1, so that the curtain S can no longer be wound on the shaft R. This can prevent the curtain S from being over-wound and the shaft R from spinning freely, or even prevent the lower gravity bar RW from being stuck in the fixed frame F due to over-wound of the curtain S, thus preventing damage to the device.

[0038] Please see Figure 5 This is a cross-sectional schematic diagram of the second embodiment of the reciprocating lever drive device of the present invention. The main difference between this embodiment and the first embodiment is that a support base 5 is added, which is located below the drive wheel 2. Each end of the support base 5 has a through hole 50, and the two ends of the chain 3 pass through the through holes 50 at both ends of the support base 5, while the operating component 4 is suspended below the support base 5. Accordingly, in this embodiment, the chain 3 can be spread open by the support base 5 to reduce the number of teeth of the chain 3 engaged with the drive wheel 2, allowing the chain 3 to disengage from the drive wheel 2 more easily and to easily return to its original position to pull the drive wheel 2 again. Moreover, the support base 5 can also fix the operating component 4, so that the operating component 4 will not wobble during operation, and the connecting member 45 and the elastic return member 46 in the previous embodiment can be omitted.

[0039] Please also refer to Figure 6 , Figure 7A and Figure 7B , Figure 6 This is a cross-sectional schematic diagram of the third embodiment of the reciprocating tie rod drive device of the present invention. Figure 7A This is a perspective view of the chain support assembly and drive wheel in the third embodiment of the reciprocating lever drive device of the present invention. Figure 7B This is an exploded view of the chain extension assembly and drive wheel in the third embodiment of the reciprocating lever drive device of the present invention. The main difference between this embodiment and the aforementioned first embodiment is that this embodiment further employs a chain extension assembly 6, which is used to extend the chain 3 out of the engaging teeth 21 of the drive wheel 2 to assist the lever (not shown in the figure) in resetting.

[0040] Further explanation: In this embodiment, the chain extension assembly 6 includes a U-shaped baffle 61 and an elastic body 62, and the U-shaped baffle 61 includes an elongated groove 610; and the drive wheel 2 includes an outer circumferential groove 22, which communicates with the plurality of engaging teeth 21. The U-shaped baffle 61 is fitted onto the outer circumferential groove 22 of the drive wheel 2, and the U-shaped baffle 61 can slide relative to the drive wheel 2 through the elongated groove 610. The elastic body 62 is a compression spring, but it can also be a leaf spring or other equivalent component that can provide elasticity or reset. It is housed in the housing C, with one end abutting against the housing C and the other end abutting against the U-shaped baffle 61, and constantly driving the U-shaped baffle 61 to rise, thereby extending the chain 3 and at least partially disengaging it from the plurality of engaging teeth 21. Similarly, in this embodiment, the distance d between the radial outer edge of the drive wheel 2 and the inner wall of the top surface of the housing C is greater than the thickness t of the chain 3, so the chain 3 can be allowed to completely disengage from the plurality of engaging teeth 21 of the drive wheel 2.

[0041] Please also refer to Figure 8A and Figure 8B , Figure 8A yes Figure 7A A cross-sectional view of line segment AA, showing the reciprocating tie rod drive device in a stationary state; Figure 8B yes Figure 7A The cross-sectional view of line segment AA shows the reciprocating pull rod drive device in operation. When the pull rod (not shown) is not being pulled down, the elastic body 62 stretches, causing the U-shaped baffle 61 to move upward and support the chain 3, allowing the chain 3 to disengage from the engaging teeth 21, i.e. Figure 8A As shown. However, when the user pulls down the lever (not shown in the figure), the pulling force exceeds the elastic force of the elastic body 62, and the chain 3 forces the U-shaped baffle 61 to move down, causing the chain 3 to engage the locking teeth 21, thereby driving the drive wheel 2 to rotate, i.e. Figure 8B As shown.

[0042] As can be seen from the above, in this embodiment, when the chain 3 drives the drive wheel 2 to rotate, the number of teeth of the chain 3 engaged with the engagement teeth 21 of the drive wheel 2 is less than or equal to half the total number of teeth of the engagement teeth 21; while when the drive wheel is not rotating, the chain extension assembly 6 extends the chain 3 and at least partially disengages the chain 3 from the engagement teeth 21. In other words, the chain extension assembly 6 in this embodiment plays the role of a clutch. When the user pulls down the lever, the chain extension assembly 6 can make the chain 3 engage with the engagement teeth 21 of the drive wheel 2; and when the user releases the lever, the chain extension assembly 6 can make the chain 3 disengage from the engagement teeth 21 of the drive wheel 2, and the lever (not shown in the figure) and the chain 3 can smoothly and automatically reset, which is convenient for user operation and can significantly reduce noise.

[0043] Please see Figure 9AThis is a partially enlarged cross-sectional view of the chain extension assembly and drive wheel in the fourth embodiment of the reciprocating lever drive device of the present invention. The chain extension assembly 6 in this embodiment includes a plurality of convex springs 65, each respectively accommodated in a groove 210 within a plurality of engaging teeth 21. Each convex spring 65 constantly extends the chain 3 and at least partially disengages it from the engaging teeth 21. See also... Figure 9B This is a partially enlarged cross-sectional view of the chain extension assembly and drive wheel in the fifth embodiment of the reciprocating lever drive device of the present invention. The chain extension assembly 6 in this embodiment includes multiple top posts 66 and multiple springs 67, which are respectively accommodated in grooves 210 within multiple engaging teeth 21. Each top post 66, under the influence of the tension of the spring 67, constantly extends the chain 3 and at least partially disengages it from the engaging teeth 21. Therefore, the chain extension assembly 6 of the present invention is not limited to the aforementioned embodiments. Any mechanism or component that can extend the chain 3 and at least partially disengage it from the engaging teeth 21 when the chain 3 is not under force should be included within the scope of the present invention.

[0044] Please also refer to Figure 10A , Figure 10B and Figure 10C , Figure 10A This is a perspective view of the sixth embodiment of the reciprocating tie rod drive device of the present invention. Figure 10B This is a perspective view of the sixth embodiment of the reciprocating tie rod drive device of the present invention after removing the housing. Figure 10C This is a perspective view of the chain support assembly and drive wheel in the sixth embodiment of the reciprocating lever drive device of the present invention. In order to allow the lever 42 to automatically reset more smoothly, that is, to allow the curtain S to be continuously wound around the shaft R or continuously released from the shaft R by the user intermittently pulling the lever 42, the present invention provides a dual drive wheel configuration in the sixth embodiment.

[0045] To further explain, this embodiment mainly integrates two sets of reciprocating lever drive devices as described in the third embodiment above. Each device includes two drive wheels 2 and 20, two chains 3 and 30, two operating components 4 and 40, and two chain extension components 6. The two drive wheels 2 and 20 are each mounted on a shaft R. The two chains 3 and 30 are respectively engaged with the two drive wheels 2 and 20. The two operating components 4 and 40 are hinged to the lower end face of the housing C. Each chain extension component 6 includes U-shaped baffles 61 and 63 and elastic bodies 62 and 64. The U-shaped baffles 61 and 63 are respectively fitted into the outer circumferential grooves 22 of the two drive wheels 2 and 20, and these U-shaped baffles 61 and 63 can slide relative to the two drive wheels 2 and 20. One end of the elastomers 62 and 64 abuts against the housing C, and the other end abuts against the two U-shaped baffles 61 and 63 respectively. The elastomers 62 and 64 are driven by the two U-shaped baffles 61 and 63 to push out the two chains 3 and 30 respectively and at least partially disengage from the multiple engagement teeth 21 of the two drive wheels 2 and 20.

[0046] Each operating component 4, 40 includes two sleeves 41, 401, a stop block 44, 404, a pull rod 42, 402, and springs 43, 403. The two pull rods 42, 402 are respectively connected to one end of the two chains 3, 30, and are on different sides. The two stop blocks 44, 404 are respectively connected to the other end of the two chains 3, 30, and are also on different sides. Each end of each chain 3, 30 is fitted with a sleeve 41, 401. The springs 43, 403 are housed in the sleeves 41, 401 on the same side as the stop blocks 44, 404. One end of the springs 43, 403 abuts against the sleeves 41, 401, and the other end abuts against the stop blocks 44, 404.

[0047] Accordingly, in this embodiment, since the two pull rods 42 and 402 are positioned on different sides—one at the front and one at the rear—when the two pull rods 42 and 402 are pulled respectively, the shaft R will rotate in different directions. In other words, pulling pull rod 42 will cause the shaft R to rotate clockwise, while pulling pull rod 402 will cause the shaft R to rotate counterclockwise. Furthermore, thanks to the elastic force of the elastic bodies 62 and 64, when the two pull rods 42 and 402 are pulled respectively, the resetting action of the U-shaped baffles 61 and 63 will cause the chains 3 and 30 to disengage from the drive wheels 2 and 20, while the springs 43 and 403 will push the stops 44 and 404 to reset, thereby automatically resetting the pull rods 42 and 402. Therefore, during operation, the user only needs to intermittently pull the pull rods 42 and 402 to continuously wind or unwind the curtain.

[0048] Please also refer to Figure 11A and Figure 11B , Figure 11A This is a perspective view of the chain support assembly and drive wheel in the seventh embodiment of the reciprocating lever drive device of the present invention. Figure 11B This is a schematic diagram of the seventh embodiment of the reciprocating pull rod drive device of the present invention applied to a horizontal double-opening curtain system; the following embodiments illustrate that the present invention can also be applied to a horizontal double-opening corded curtain system. Figure 11A As shown, the main difference between this embodiment and the aforementioned sixth embodiment is that this embodiment also includes a driven wheel 7, and a tooth 23 that can mesh with the driven wheel 7 is arranged between the drive wheels 2 and 20. Accordingly, when the drive wheels 2 and 20 are driven to rotate, they can drive the driven wheel 7 to rotate around, and the speed-increasing or speed-decelerating effect can be achieved by adjusting the ratio of the number of teeth between the driven wheel 7 and the drive wheels 2 and 20.

[0049] On the other hand, such as Figure 11B As shown, the curtain system of this embodiment mainly includes a horizontal guide rail 51, two sliding members 52, a pull cord 53, and two curtain fabrics S. The two sliding members 52 are coupled to the horizontal guide rail 51, the pull cord 53 is connected to the two sliding members 52, and the two curtain fabrics S are coupled to the horizontal guide rail 51 and respectively connected to the two sliding members 52. Furthermore, the pull cord 53 is wound within the groove 71 of the driven wheel 7. Accordingly, the reciprocating pull rod drive device 1 can pull the pull cord 53 via the pull rods 42 and 402, thereby driving the sliding members 52 to pull the curtain fabrics S horizontally. In short, the reciprocating pull rod drive device 1 provided by this invention can also be applied to horizontally opening curtain systems or other similar tarpaulin or curtain systems. This invention is not limited to horizontally opening systems; any horizontal sliding system utilizing pull cord or chain transmission is applicable to this invention.

[0050] Please see Figure 12 This is a schematic diagram of the first embodiment of the reciprocating lever drive device of the present invention applied to another roller blind system. The main difference between this embodiment and the aforementioned roller blind system is that the reciprocating lever drive device 1 on the right can be used to control the winding or unwinding of the curtain S of the roller blind module Mc, as in the previous embodiment; while the reciprocating lever drive device 10 on the left can be used to raise and lower the entire roller blind module Mc, that is, a hollow area T can be presented in the upper section of the curtain. A rolling bar Rs is pivotally connected to the fixing frame F, and the reciprocating lever drive device 10 is installed at one end of the rolling bar Rs. The rolling bar Rs is wound with two steel cables W, and one end of the steel cables W is connected to the roller blind module Mc. Accordingly, by operating the reciprocating lever drive device 10, the rolling bar Rs can be driven to wind or unwind the steel cables W, thereby raising and lowering the entire roller blind module Mc.

[0051] The above embodiments are merely illustrative examples for ease of explanation. The scope of the claims of this invention should be determined by the scope of the claims, and not limited to the above embodiments.

[0052] Explanation of reference numerals in the attached figures

[0053] 1, 10: Reciprocating tie rod drive device

[0054] 2.20: Drive wheels

[0055] 3, 30: Chain

[0056] 4, 40: Operation Components

[0057] 5: Support base

[0058] 6: Chain supports the components

[0059] 7: Driven wheel

[0060] 21: Engaging teeth

[0061] 22: Outer ring groove

[0062] 23: Convex teeth

[0063] 41, 401: Sleeve

[0064] 42, 402: Pull rod

[0065] 43, 403: Springs

[0066] 44, 404: Stop blocks

[0067] 45: Connector

[0068] 46: Elastic reset component

[0069] 47: Baffle

[0070] 50: Through hole

[0071] 51: Horizontal guide rail

[0072] 52: Slider

[0073] 53: Pull rope

[0074] 61, 63: U-shaped baffle

[0075] 62, 64: Elastomers

[0076] 65: Convex spring

[0077] 66: Top Column

[0078] 67: Spring

[0079] 71: Trench

[0080] 90: Scroll bar

[0081] 91: Sprocket

[0082] 92: Beaded Necklace

[0083] 93: Shell

[0084] 210: Container

[0085] 405: Step difference department

[0086] 470: Through hole

[0087] 610: Long slot

[0088] C: Shell

[0089] C1: Opening

[0090] F: Fixture

[0091] F1: Limiting component

[0092] d: Spacing

[0093] Mc: Roller blind module

[0094] R: Shaft

[0095] Rs: scrollbar

[0096] RW: Gravity bar

[0097] S: Curtain

[0098] S1: Stop component

[0099] T: Hollowed-out area

[0100] t: thickness

[0101] W: Steel cable.

Claims

1. A reciprocating tie rod drive device, comprising: case; A shaft, one end of which extends into the housing; A drive wheel, which is powered by the shaft and housed within the housing, includes multiple engaging teeth; A chain that engages with the plurality of engaging teeth of the drive wheel; and An operating assembly, connected to the chain and adapted to operate the chain to drive the drive wheel to rotate; the operating assembly includes two sleeves, two baffles, two pull rods and two springs, the two sleeves are respectively sleeved on both ends of the chain, the two baffles and the two springs are respectively housed in the two sleeves, each sleeve includes a step portion, the two baffles abut against the step portion of the sleeve, one end of each spring abuts against the sleeve and the other end abuts against the baffle, each baffle includes a through hole, both ends of the chain pass through these through holes of the two baffles and are respectively connected to the two pull rods; Wherein, the distance between the radial outer edge of the drive wheel and the inner wall of the housing is greater than or equal to the thickness of the chain; the number of teeth of the chain engaging with the plurality of engaging teeth of the drive wheel is less than or equal to half the total number of teeth of the plurality of engaging teeth.

2. The reciprocating tie rod drive device according to claim 1, wherein, The operating assembly also includes a connector and a resilient reset member. The two sleeves are connected to each other through the connector, and the two ends of the resilient reset member are respectively connected to the connector and the housing.

3. The reciprocating pull rod drive device according to claim 1, further comprising a chain extension assembly housed within the housing; wherein, When the chain drives the drive wheel to rotate, the number of teeth of the chain engaging with the drive wheel is less than or equal to half the total number of teeth of the plurality of engaging teeth; when the drive wheel is not rotating, the chain extension assembly extends the chain and at least partially disengages the chain from the plurality of engaging teeth.

4. The reciprocating tie rod drive device according to claim 3, wherein, The chain extension assembly includes a U-shaped baffle and an elastomer. The drive wheel includes an outer circumferential groove that communicates with the plurality of engaging teeth. The U-shaped baffle is fitted onto the outer circumferential groove of the drive wheel, thereby allowing the U-shaped baffle to slide relative to the drive wheel. The elastomer is housed within the housing, with one end abutting against the housing and the other end abutting against the U-shaped baffle, and constantly driving the U-shaped baffle to extend the chain and at least partially disengage it from the plurality of engaging teeth.

5. The reciprocating tie rod drive device according to claim 4, further comprising another drive wheel, another chain, another operating component, another U-shaped baffle, and another elastic body; the other drive wheel is poweredly connected to the shaft, and the other drive wheel includes a plurality of engaging teeth and an outer circumferential groove; the other chain engages with the plurality of engaging teeth of the other drive wheel; the other operating component is connected to the other chain and adapted to operate the other chain to drive the other drive wheel to rotate; the other U-shaped baffle is sleeved on the outer circumferential groove of the other drive wheel and is slidable relative to the other drive wheel; the other elastic body is housed within the housing, one end of which abuts against the housing, and the other end abuts against the other U-shaped baffle; wherein, The distance between the radial outer edge of the other drive wheel and the inner wall of the housing is greater than or equal to the thickness of the other chain; when the other chain drives the other drive wheel to rotate, the number of teeth of the other chain engaging with the plurality of engagement teeth of the other drive wheel is less than or equal to half the total number of teeth of the plurality of engagement teeth; when the other drive wheel is not rotating, the other chain extension assembly extends the other chain out of the plurality of engagement teeth of the other drive wheel, so that the other chain is at least partially disengaged from the plurality of engagement teeth.

6. The reciprocating tie rod drive device according to claim 5, wherein, Each operating component includes two sleeves, a stop, a lever, and a spring. The levers are connected to one end of the chains, the stops are connected to the other end of the chains, the sleeves are fitted over both ends of the chains, and the springs are housed within one of the sleeves. One end of each spring abuts against the sleeve, and the other end abuts against either the stop or the lever. The lever of one operating component is used to drive the drive wheel to rotate clockwise, and the lever of the other operating component is used to drive the other drive wheel to rotate counterclockwise.

7. The reciprocating tie rod drive device according to claim 5, further comprising a driven wheel disposed on the shaft and poweredly connected to at least one of the drive wheel and the other drive wheel; wherein, When the drive wheel and at least one of the other drive wheels rotate, the driven wheel is driven to rotate.

8. A curtain system, comprising: The reciprocating tie rod drive device according to any one of claims 1 to 7; as well as The curtain is wound around or released from the shaft by the reciprocating pull rod drive device.

9. The curtain system according to claim 8, further comprising a fixing frame, wherein the reciprocating pull rod drive device is disposed on the fixing frame; the fixing frame includes a limiting member; the curtain fabric is provided with a stop member; when the curtain fabric is wound on the shaft and the stop member abuts against the limiting member, the shaft cannot continue to wind the curtain fabric.

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