Ratchet locking structure and automatic umbrella with the structure for preventing rope from being pulled off

Abstract

The utility model relates to a kind of ratchet locking structure and the automatic umbrella of preventing rope from being pulled off of adopting the structure, ratchet locking structure includes the winding shaft for winding pull rope, ratchet and pawl, winding shaft and ratchet synchronous rotation, more than one ratchet tooth is fixedly arranged on ratchet, pawl head is fixedly arranged on pawl, pawl head and ratchet tooth are oppositely arranged, pawl head and ratchet tooth abut together in normal state, when the force between pawl head and ratchet tooth exceeds set limit, pawl head and ratchet tooth can be mutually staggered.The utility model designs the structure between ratchet and pawl as exceeding set limit can realize tripping, so that its skill is stuck in ratchet in normal use, prevent pull rope from being loosened, also can be tripped between ratchet and pawl in abnormal operation, prevent pulling off pull rope, to avoid the damage to pull rope, maintain its normal use.

Description

Technical Field

[0001] This utility model relates to an automatic umbrella, and more particularly to a ratchet locking structure and an automatic umbrella using the same structure to prevent the rope from breaking, belonging to the technical field of daily necessities. Background Technology

[0002] An automatic umbrella is an umbrella that can automatically open and close its canopy. Due to its ease of use, it has been widely loved since its invention.

[0003] Current automatic umbrellas all use an internal pull cord and pulley system to pull the umbrella ribs, which, in conjunction with springs, enables the umbrella to open and close automatically. Therefore, automatic umbrellas can also be called self-closing umbrellas or pull-cord umbrellas. In all existing automatic umbrellas that use a pull cord for opening and closing, one end of the cord is led to the umbrella handle for either fixation or winding and closing. Currently, the end of the cord is wound around a winding shaft, which is fixed by a coaxial ratchet to maintain unidirectional rotation and prevent reverse rotation. The ratchet can also be locked with a pawl; when the pawl is unlocked, the winding shaft can rotate freely again.

[0004] This type of automatic umbrella uses a ratchet-locking mechanism. When the central pole is closed, the pull cord is wound onto the winding shaft by a coil spring. When the unlock button is pressed, the pull cord is pulled out; this is the ideal operating condition for this type of umbrella. However, if the central pole is closed only halfway during the closing process, and the pull cord is also only half-closed, the unlock button is disabled. In other words, pressing the unlock button will not activate the umbrella. If someone mistakenly believes the umbrella is damaged and tries to force it open, the ratchet locks the pull cord, making it impossible to open. Instead, the cord will tighten further, eventually breaking the pull cord and rendering the entire umbrella unusable, resulting in unnecessary loss and waste. Summary of the Invention

[0005] In view of the aforementioned shortcomings of existing automatic umbrellas, such as the ease with which the pull cord can break due to misoperation, resulting in damage to the entire umbrella, this utility model provides a ratchet locking structure and an automatic umbrella using this structure to prevent the pull cord from breaking. The ratchet and pawl are designed to disengage beyond a set limit to avoid damage to the pull cord.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a ratchet locking structure, which includes a winding shaft for winding a pull rope, a ratchet, and a pawl. The winding shaft and the ratchet rotate synchronously. One or more ratchet teeth are fixedly provided on the ratchet, and a pawl head is fixedly provided on the pawl. The pawl head and the ratchet teeth are arranged opposite to each other. In normal state, the pawl head and the ratchet teeth abut together. When the force between the pawl head and the ratchet teeth exceeds a set limit, the pawl head and the ratchet teeth can be displaced.

[0007] An automatic umbrella employing the ratchet locking structure described above to prevent rope breakage includes a handle, a center rod, ribs, and a canopy. The center rod is inserted into the handle, the ribs are mounted on the center rod, and the canopy is mounted on the ribs. The handle includes a handle housing, an internal support member, the ratchet locking structure as described in any one of claims 1 to 2, and a cover plate. The internal support member is fixedly installed inside the handle housing, the cover plate is snapped onto the internal support member, the ratchet locking structure is installed between the cover plate and the internal support member, and the center rod is inserted into the internal support member.

[0008] The technical solution adopted by this utility model to solve its technical problem further includes: The surfaces of the pawl head and / or ratchet teeth that come into contact are arc-shaped or inclined.

[0009] The winding shaft and ratchet are coaxially integrated. The ratchet is located at one end of the winding shaft, and a first end shaft is fixedly located at the other end of the winding shaft. A second end shaft is fixedly located at the other end of the ratchet. The first end shaft and the second end shaft are installed inside the umbrella handle.

[0010] A disc spring is wound around the first end shaft, and a second disc spring hanging interface is provided on the first end shaft, with the inner end of the disc spring hanging on the second disc spring hanging interface.

[0011] A pull rope is wound around the winding spool, and the knot at the end of the pull rope passes through the wire hole and is secured at the wire-locking notch.

[0012] The ratchet has a pin hole in the middle, into which a pin is inserted. The ratchet head is located at one end of the ratchet, and the other end of the ratchet is a reset part. A spring hole is provided on the reset part, and a ratchet reset spring is installed in the spring hole. An unlocking part is fixedly provided on the ratchet.

[0013] The cover plate has a cover plate latch, and a buckle is fixedly installed at a corresponding position on the internal support member. The buckle is engaged in the cover plate latch. A cover plate hook is fixedly installed on the cover plate. A slot is provided at a corresponding position on the internal support member. The cover plate hook is engaged in the slot. A cover plate shaft hole is provided on the cover plate. A support member shaft hole is provided at a corresponding position on the internal support member. A first end shaft is inserted into the cover plate shaft hole, and a second end shaft is inserted into the support member shaft hole.

[0014] The internal support is fitted with a first pin, through which a pawl is installed in the internal support. A first return spring is installed in the spring hole, and the first return spring is located between the return part of the pawl and the internal support.

[0015] The internal support component contains a button core, which in turn contains a hardware insert. A third return spring is provided between the hardware insert and the internal support component. A linkage intermediate component is inserted into the internal support component, and a fourth return spring is provided between the linkage intermediate component and the internal support component. An unlocking fork is installed in the internal support component via a third pin. One end of the unlocking fork corresponds to the linkage intermediate component, and the other end corresponds to the unlocking part. A first disc spring hanging interface is provided on the internal support component, and the outer end of the disc spring is hung on the first disc spring hanging interface.

[0016] The beneficial effects of this utility model are: This utility model designs the ratchet and pawl to have a structure that can disengage beyond a set limit, so that it can lock the ratchet during normal use to prevent the pull rope from loosening, and can also prevent the pull rope from breaking by disengaging between the ratchet and pawl during abnormal operation, thereby avoiding damage to the pull rope and maintaining its normal use.

[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0019] Figure 2 This is a schematic diagram of the semi-decomposed structure of this utility model.

[0020] Figure 3 This is a schematic diagram of the fully disassembled structure of this utility model.

[0021] Figure 4 This is a schematic diagram of the internal structure of this utility model.

[0022] Figure 5 This is an exploded view of the ratchet locking structure in this utility model.

[0023] Figure 6 This is a second-view exploded view structural diagram of the ratchet locking structure in this utility model.

[0024] Figure 7 This is a side view of one embodiment of the ratchet locking structure in this utility model.

[0025] Figure 8 This is a side view of the second embodiment of the ratchet locking structure in this utility model.

[0026] Figure 9 This is a side view of the ratchet locking structure in Embodiment 3 of this utility model.

[0027] Figure 10 This is a side view of the ratchet locking structure in the prior art.

[0028] In the diagram, 1-Umbrella handle outer shell, 2-Unlock button, 21-Button inner core, 22-Hardware insert, 23-Linkage intermediate component, 24-Unlock fork, 3-Internal support component, 31-First pin, 32-Second pin, 33-Third pin, 34-First return spring, 35-Second return spring, 36-Third return spring, 37-Fourth return spring, 38-First coil spring hanging interface, 4-Cover plate, 41-Cover plate shaft hole, 42-Cover plate bayonet. 43-Cover plate hook, 5-Ratchet assembly, 51-Winding shaft, 511-Wire guide hole, 512-Wire locking notch, 52-Ratchet, 521-Ratchet tooth, 53-First end shaft, 531-Second disc spring hanging interface, 54-Second end shaft, 55-Disc spring, 56-Pawl, 561-Pawl head, 562-Unlocking part, 563-Reset part, 564-Pin hole, 565-Spring hole, 6-Center rod, 61-Center rod insert, 62-Pull rope. Detailed Implementation

[0029] This embodiment is a preferred embodiment of the present invention. All other embodiments that are the same as or similar to this embodiment in principle and basic structure are within the protection scope of the present invention.

[0030] Please refer to the appendix for details. Figure 5 and attached Figure 6 This utility model mainly protects a ratchet locking structure used in automatic umbrellas. The structure mainly includes a winding shaft 51 for winding the pull rope, a ratchet 52, and a pawl 56. The winding shaft 51 and the ratchet 52 rotate synchronously. One or more ratchet teeth 521 are fixedly provided on the ratchet 52, and a pawl head 561 is fixedly provided on the pawl 56. The pawl head 561 and the ratchet teeth 521 are arranged opposite to each other. In the normal state, the pawl head 561 and the ratchet teeth 521 abut together. When the force between the pawl head 561 and the ratchet teeth 521 exceeds a set limit, the pawl head 561 and the ratchet teeth 521 can be displaced, so that the ratchet 52 is no longer restricted by the pawl 56 and can rotate freely.

[0031] Under normal conditions, the optimal configuration between the pawl and ratchet is such that the greater the force applied, the tighter the engagement between them. In this invention, to achieve a staggered relationship between the pawl head 561 and the ratchet tooth 521, the contact surfaces of the pawl head 561 and the ratchet tooth 521 are designed as arc-shaped or inclined surfaces. When force is applied between the pawl head 561 and the ratchet tooth 521, the direction of the force changes due to the arc-shaped or inclined contact surface, preventing it from being along the circle of the ratchet 52. Instead of moving in the circumferential direction, the ratchet 52 will tilt, generating a component force towards the center of the ratchet 52. Similarly, due to the interaction of forces, a component force will also be generated on the pawl 56 away from the center of the ratchet 52. These two components will compress the pawl head 561 and the ratchet tooth 521 respectively, causing them to deform. When the deformation reaches a certain point, the pawl head 561 and the ratchet tooth 521 can be misaligned, thereby freeing the ratchet 52 from the restriction of the pawl 56 and allowing it to rotate freely. In this embodiment, the deformation can include deformation caused by the compression of the material of the ratchet 52 and / or pawl 56 (this deformation can be simply understood as the ratchet 52 and / or pawl 56 being "flattened"; when the ratchet 52 and pawl 56 are made of rigid materials, this deformation is negligible), or deformation caused by the bending of the ratchet 52 and pawl 56 under force. This deformation is usually concentrated at the pawl head 561, the ratchet tooth 521, or the pawl 56 body, as shown in the attached drawings, mainly manifested in... Figure 7 , Figure 8 and Figure 9 At positions “A”, “B”, and “C”, the deformation can be simply understood as the pawl head 561 and / or ratchet tooth 521 being “bent”. Please refer to the appendix. Figure 7 In this embodiment, the surface on the pawl head 561 is designed as an arc surface. In specific implementation, it can also be designed as a sloping surface.

[0032] Please refer to the appendix. Figure 8 In this embodiment, the surface on the ratchet tooth 521 is designed as an arc surface. In specific implementation, it can also be designed as an inclined surface.

[0033] Please refer to the appendix. Figure 9 In this embodiment, the surfaces on the pawl head 561 and the ratchet tooth 521 are designed as arc-shaped surfaces. In specific implementation, they can also be designed as inclined surfaces.

[0034] In this embodiment, the force range within which the pawl head 561 and the ratchet tooth 521 can be offset from each other is greater than the force of the rope's rebound but less than the force that would break the rope. This satisfies the requirement that, under normal conditions, the pawl head 561 and the ratchet tooth 521 are engaged together, preventing the rope from automatically disengaging under its rebound force. At the same time, when a strong external pulling force is generated, the pawl head 561 and the ratchet tooth 521 can be offset from each other before the rope breaks, thereby protecting the safety of the rope.

[0035] Interference occurs at the contact surface between the pawl head 561 and the ratchet tooth 521 to maintain normal operation. Due to the different forces on the pull cords of different umbrellas, the different materials used for the ratchet 52 and pawl 56 (resulting in different deformation coefficients), and their different sizes, the required degree of interference between the contact surface between the pawl head 561 and the ratchet tooth 521 varies. In this embodiment, the size is not strictly limited. Taking the structure applied to a three-fold automatic umbrella as an example, the interference thickness between the pawl head 561 and the ratchet tooth 521 (i.e., when the pawl head 561 and the ratchet tooth 521 rotate freely, the outer edges of the two overlap, and the maximum width of the overlap is defined as the interference thickness) is 0.2~0.5mm.

[0036] In this embodiment, the winding shaft 51 and the ratchet 52 rotate synchronously. Preferably, the winding shaft 51 and the ratchet 52 are coaxially integrated (they can also be separate). The structure is simple and easy to implement. In specific implementation, the winding shaft 51 and the ratchet 52 can also be driven by a gear set.

[0037] In this embodiment, a ratchet 52 is disposed at one end of a winding shaft 51, and a first end shaft 53 is fixedly disposed at the other end of the winding shaft 51. A second end shaft 54 ​​is fixedly disposed at the other end of the ratchet 52. The first end shaft 53 and the second end shaft 54 ​​are installed inside the umbrella handle, allowing the winding shaft 51 and the ratchet 52 to rotate along the first end shaft 53 and the second end shaft 54. In this embodiment, a coil spring 55 is wound on the first end shaft 53 (the coil spring 55 in the attached drawing only indicates the presence of this component, but is not complete). A second coil spring hanging interface 531 is provided on the first end shaft 53, and the inner end of the coil spring 55 is hooked onto the second coil spring hanging interface 531 (the hooking structure is not shown in the attached drawing).

[0038] In this embodiment, the pull rope 62 is wound around the winding shaft 51, and the knot at the end of the pull rope passes through the wire hole 511 and is secured at the wire-locking notch 512.

[0039] In this embodiment, a pin hole 564 is provided at the middle position of the pawl 56, into which a pin can be inserted to allow the pawl 56 to rotate along the pin. A pawl head 561 is provided at one end of the pawl 56, and a reset part 563 is provided at the other end of the pawl 56. A spring hole 565 is provided on the reset part 563, and a pawl reset spring is installed in the spring hole 565 to push the pawl 56 to maintain the locked state. An unlocking part 562 is fixedly provided on the pawl 56. Pushing the unlocking part 562 causes the pawl 56 to rotate, thereby disengaging the pawl head 561 from the ratchet teeth 521, thus unlocking the pawl.

[0040] Please refer to the appendix for details. Figure 1 To be continued Figure 10 This utility model also protects an automatic umbrella that uses the above-mentioned ratchet locking structure to prevent rope breakage. It mainly includes an umbrella handle, a center rod, umbrella ribs, and umbrella fabric. The center rod is inserted into the umbrella handle, the umbrella ribs are mounted on the center rod, and the umbrella fabric is mounted on the umbrella ribs. The improvement of this utility model is concentrated in the structural part inside the umbrella handle. The other structures of the automatic umbrella are the same as those in the prior art and will not be described again here. The umbrella handle mainly includes an umbrella handle shell 1, an internal support member 3, a ratchet assembly 5 (i.e., the above-mentioned ratchet locking structure), and a cover plate 4. The internal support member 3 is fixedly installed inside the umbrella handle shell 1, the cover plate 4 is snapped onto the internal support member 3, the ratchet assembly 5 is installed between the cover plate 4 and the internal support member 3, and the center rod 6 is inserted into the internal support member 3 and fixed by a first pin 31.

[0041] In this embodiment, the cover plate 4 has a cover plate latch 42, and the internal support member 3 has a corresponding latch 39 fixedly installed at the corresponding position. The latch 39 is engaged in the cover plate latch 42. The cover plate 4 has a cover plate hook 43 fixedly installed, and the internal support member 3 has a corresponding slot (not shown in the figure). The cover plate hook 43 is engaged in the slot, thereby completing the installation of the cover plate 4 and the internal support member 3. In this embodiment, the cover plate 4 has a cover plate shaft hole 41, and the internal support member 3 has a corresponding support member shaft hole (not shown in the figure). The first end shaft 53 is inserted into the cover plate shaft hole 41, and the second end shaft 54 ​​is inserted into the support member shaft hole. In this embodiment, the first pin 31 is inserted into the internal support member 3, and the pawl 56 is installed in the internal support member 3 through the first pin 31, so that the pawl 56 can rotate along the first pin 31. In this embodiment, a first reset spring 34 is installed in the spring hole 565, and the first reset spring 34 is disposed between the reset part 563 of the pawl 56 and the internal support member 3.

[0042] In this embodiment, a button core 21 is inserted into the internal support member 3, and a hardware insert 22 is embedded in the button core 21. The locking and opening of the automatic umbrella can be controlled by the hardware insert 22. A third reset spring 36 is provided between the hardware insert 22 and the internal support member 3.

[0043] In this embodiment, a linkage intermediate component 23 is inserted into the internal support component 3. A fourth reset spring 38 is provided between the linkage intermediate component 23 and the internal support component 3. When the button core 21 moves, it can push the linkage intermediate component 23 to move together. An unlocking fork 24 is installed in the internal support component 3 through a third pin 33. One end of the unlocking fork 24 is set corresponding to the linkage intermediate component 23. The unlocking fork 24 can be pushed to rotate by the linkage intermediate component 23. A second reset spring 35 is provided between this end of the unlocking fork 24 and the cover plate 4. The other end of the unlocking fork 24 is set corresponding to the unlocking part 562. The unlocking part 562 can be unlocked by pushing the unlocking fork 24.

[0044] In this embodiment, an unlocking button 2 is provided on the umbrella handle shell 1, and the unlocking button 2 is provided corresponding to the button core 21.

[0045] In this embodiment, the internal support member 3 is provided with a first disc spring hanging interface 38, and the outer end of the disc spring 55 is hung on the first disc spring hanging interface 38 (the hanging structure is not shown in the figure).

[0046] In this embodiment, a central rod insert 61 is embedded in the central rod 6, and a pull rope 62 is led out from the central rod 6 and connected to other parts of the automatic umbrella.

[0047] This utility model designs a structure between the ratchet and the pawl that can disengage beyond a set limit. This allows the ratchet to be locked during normal use to prevent the rope from loosening, and also allows the rope to disengage during abnormal operation to prevent it from breaking, thus avoiding damage to the rope and maintaining its normal use.

Claims

1. A ratchet locking structure, characterized in that: The ratchet locking structure includes a winding shaft (51) for winding the pull rope, a ratchet (52) and a pawl (56). The winding shaft (51) and the ratchet (52) rotate synchronously. The ratchet (52) is fixedly provided with one or more ratchet teeth (521). The pawl (56) is fixedly provided with a pawl head (561). The pawl head (561) and the ratchet teeth (521) are arranged opposite to each other. In normal state, the pawl head (561) and the ratchet teeth (521) abut together. When the force between the pawl head (561) and the ratchet teeth (521) exceeds the set limit, the pawl head (561) and the ratchet teeth (521) can be displaced from each other.

2. The ratchet locking structure according to claim 1, characterized in that: The surfaces of the pawl head (561) and / or ratchet teeth (521) that come into contact are arc-shaped or inclined.

3. An automatic umbrella employing a ratchet locking structure as described in claim 1 or 2 to prevent rope breakage, the automatic umbrella comprising a handle, a center rod, ribs, and a canopy, the center rod being inserted into the handle, the ribs being mounted on the center rod, and the canopy being mounted on the ribs, characterized in that: The umbrella handle includes an umbrella handle shell (1), an internal support member (3), a ratchet locking structure as described in claim 1 or 2, and a cover plate (4). The internal support member (3) is fixedly installed inside the umbrella handle shell (1), the cover plate (4) is snapped onto the internal support member (3), the ratchet locking structure is installed between the cover plate (4) and the internal support member (3), and the center rod (6) is inserted into the internal support member (3).

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