A hand crank device for a parasol

Abstract

This utility model provides a hand crank device for a sunshade umbrella, belonging to the field of sunshade umbrella technology. It solves the technical problem that existing hand crank devices can only open and close the umbrella surface. The hand crank device of this sunshade umbrella has a slanted rod and a slanted rod connector fixedly connected. The drive shaft is arranged horizontally, with one end inserted into the housing and the other end fixedly connected to the crank handle. A rope-winding wheel and a drive gear are sleeved on the drive shaft. Both the slanted rod and the slanted rod connector have rope-passing holes for the umbrella rope to pass through. The rope-passing holes are opposite to the rope-winding wheel. The drive gear is connected to the slanted rod connector through a transmission mechanism and drives the slanted rod connector to rotate. The drive shaft has protrusions from a first pin and a second pin, or a first pin-shaped protrusion and a second pin-shaped protrusion. The rope-winding wheel is fixedly connected or has a first pin groove, and the drive gear is fixedly connected or has a second pin groove. This utility model can simultaneously control the opening and closing of the umbrella surface and the rotation of the sunshade umbrella by moving the drive shaft back and forth.

Description

Technical Field

[0001] This utility model belongs to the field of sunshade umbrella technology, and specifically refers to a hand crank device for a sunshade umbrella. Background Technology

[0002] Sun umbrellas are daily necessities for outdoor activities. Because they require a large canopy area for sun protection, the umbrella poles are tall, the umbrella frame has a large range of motion, and a hand crank is needed to control the opening or closing of the sun umbrella.

[0003] Currently, existing hand crank devices, such as the hand crank device for a sun umbrella disclosed in utility model application number 201020174312.1, include a hand crank mechanism and a locking mechanism that are configured to cooperate with each other. The hand crank mechanism consists of a front cover and a rear cover of the hand crank housing that are configured to cooperate with each other. The front cover of the hand crank housing has a cylindrical hole with external threads corresponding to the locking mechanism. The hand crank mechanism includes a hand crank shaft and a winding wheel that is sleeved and connected to it. The hand crank passes through the rear cover of the hand crank housing and is configured to cooperate with the winding wheel. The winding wheel is wound with an umbrella rope for controlling the opening and closing of the umbrella surface. The locking mechanism includes a locking block and a locking handwheel installed in the cylindrical hole of the front cover of the hand crank housing. The end of the locking handwheel is configured with a locking handwheel cover.

[0004] However, the existing hand crank can only open and close the parasol canopy, but cannot control the rotation of the parasol. A separate structure is needed to control the rotation of the parasol, which is complex. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a hand crank device for controlling the opening and closing of the umbrella canopy and the rotation of the sunshade.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] A hand crank device for a sunshade umbrella, characterized in that it includes a housing, a crank handle, a drive shaft, and a diagonal rod, wherein the diagonal rod is fixedly connected to a diagonal rod connector mounted on the upper part of the housing, the drive shaft is arranged horizontally, one end of the drive shaft is inserted into the housing, and the other end is fixedly connected to the crank handle.

[0008] A rope-winding wheel and a drive gear are fitted onto the drive shaft.

[0009] Both the diagonal bar and the diagonal bar connector are provided with rope passage holes for paracord to pass through. The rope passage holes are arranged opposite to the rope winding wheel. The drive gear is connected to the diagonal bar connector through a transmission mechanism and drives the diagonal bar connector to rotate.

[0010] The drive shaft is provided with a first pin and a second pin protruding from the outer circumference of the drive shaft, or the drive shaft is formed with a first pin-shaped protrusion and a second pin-shaped protrusion protruding from the outer circumference of the drive shaft. The winding wheel is fixedly connected to or formed with a first pin groove that mates with the first pin or the first pin-shaped protrusion. The drive gear is fixedly connected to or formed with a second pin groove that mates with the second pin or the second pin-shaped protrusion. When the first pin or the first pin-shaped protrusion is inserted into the first pin groove, the second pin or the second pin-shaped protrusion is separated from the second pin groove. When the second pin or the second pin-shaped protrusion is inserted into the second pin groove, the first pin or the first pin-shaped protrusion is separated from the first pin groove.

[0011] The hand crank of this sunshade moves the drive shaft back and forth, thereby connecting the drive shaft to the rope wheel or the drive gear. When the drive shaft is connected to the rope wheel, turning the hand crank can control the opening and closing of the umbrella surface. When the drive shaft is connected to the drive gear, turning the hand crank can control the rotation of the slant bar (sunshade). Thus, this hand crank can simultaneously control the opening and closing of the umbrella surface and the rotation of the sunshade.

[0012] Specifically, the crank handle can move left and right. When the crank handle is pulled out of the housing, rotating the crank handle clockwise will open the umbrella, and rotating the crank handle counterclockwise will close the umbrella.

[0013] Umbrella opening and closing principle: Pulling out the crank handle causes the first pin or first pin-shaped protrusion on the switching shaft to engage with the crank shaft. When the crank handle is rotated, it drives the drive shaft to rotate, which in turn drives the crank shaft to rotate. The crank shaft drives the rope wheel to rotate (the rope wheel has umbrella rope attached to it). The other end of the umbrella rope is attached to the lower umbrella disc. The rope wheel winds the umbrella rope, which in turn drives the lower umbrella disc to move up and down, thus achieving the effect of opening and closing the umbrella.

[0014] When the crank handle is pressed in and close to the housing, rotating the handle clockwise or counterclockwise allows the umbrella surface to rotate left and right, enabling guests to effectively shade themselves according to the sun's position.

[0015] Umbrella rotation principle: When the crank handle is pressed in, the first pin or first pin-shaped protrusion on the drive shaft disengages from the crank shaft, and the second pin or second pin-shaped protrusion meshes with the drive gear. When the crank handle is rotated, it drives the drive shaft to rotate, which in turn drives the drive gear to rotate. The drive gear then drives the diagonal rod connector to rotate. The diagonal rod connector is fixed to the diagonal rod, thereby driving the diagonal rod to rotate. The diagonal rod then drives the entire umbrella surface to rotate, thus achieving the left and right rotation of the umbrella surface.

[0016] In the aforementioned hand cranking device for a sunshade umbrella, the transmission mechanism includes a worm gear, a worm, and a driven gear. The worm gear is fixed to the lower part of the inclined rod connector, the worm is arranged horizontally and connected to the worm gear, and the driven gear is fixedly connected to the end of the worm. The driven gear meshes with the driving gear.

[0017] The aforementioned transmission method using worm gear, worm, and driven gear has a simple structure and stable transmission; furthermore, the worm gear is designed to bypass the position of the rope winding wheel, allowing it to adapt to the relatively narrow installation space within the housing, making the entire hand crank device more compact.

[0018] In the aforementioned hand crank device for a sunshade umbrella, the rope winding wheel is connected to the front of the drive shaft, the drive gear is connected to the rear of the drive shaft, a fixing plate is provided between the rope winding wheel and the drive gear, the fixing plate is fixedly connected to the housing, and the fixing plate is provided with a through hole for the drive shaft to pass through.

[0019] The design of the aforementioned fixing plate can prevent the rope wheel and the drive gear from moving back and forth when the drive shaft is moved, which is conducive to the axial positioning of the rope wheel and the drive wheel and improves the stability of this hand crank device during use.

[0020] In the aforementioned hand cranking device for a sunshade, a hand cranking shaft is provided at the front of the rope winding wheel, and a shaft hole is provided inside the hand cranking shaft. The radius of the shaft hole is greater than the maximum distance between the first pin and the central axis of the drive shaft, or the radius of the shaft hole is greater than the maximum distance between the first pin-shaped protrusion and the central axis of the drive shaft. Several first limiting protrusions are provided circumferentially on the inner wall of the rear part of the shaft hole, and a first pin groove is formed between two adjacent first limiting protrusions. The first limiting protrusions abut against or have a gap with the outer peripheral wall of the drive shaft.

[0021] The design of the aforementioned hand crank shaft and the first pin or the first pin-shaped protrusion enables the circumferential engagement of the drive shaft and the hand crank shaft, thereby allowing the rope wheel connected to the hand crank shaft to rotate with the drive shaft.

[0022] In the aforementioned hand crank device for a sunshade umbrella, there are an even number of first pin slots arranged in a circular array around the central axis of the crank shaft. The first pin is cylindrical, with both ends protruding from the outer circumference of the drive shaft. Both ends of the first pin can be inserted into the first pin slot as the drive shaft moves. The combination of multiple first pin slots and cylindrical first pins makes it easier for the first pin to be inserted into the first pin slots, thereby making the adjustment of the drive position of this hand crank device smoother.

[0023] In the aforementioned hand crank device for a sunshade umbrella, a forward-protruding positioning protrusion is provided on the front side of the rope winding wheel, and a positioning groove that mates with the positioning protrusion is provided on the outer circumferential surface of the hand crank shaft, wherein the arc length of the positioning groove is greater than the arc length of the positioning protrusion.

[0024] The positioning protrusion of the aforementioned rope winding wheel cooperates with the positioning groove of the crank shaft, so that the groove wall of the positioning groove can abut against the positioning protrusion and drive the rope winding wheel to rotate. At the same time, the design that the arc length of the positioning groove is greater than the arc length of the positioning protrusion can create a certain gap between the two, thereby providing a certain buffer space when the rope winding wheel winds the paracord, preventing the paracord from breaking due to excessive tightness.

[0025] In the aforementioned hand cranking device for a sunshade umbrella, a circular boss is formed on the front side of the drive gear, and the front side of the circular boss abuts against the fixing plate. The drive gear is provided with a gear hole that passes through it from front to back. The radius of the gear hole is greater than the maximum distance between the second pin and the central axis of the drive shaft, or the radius of the gear hole is greater than the maximum distance between the second pin-shaped protrusion and the central axis of the drive shaft. Several second limiting protrusions are arranged circumferentially on the inner wall of the front part of the gear hole, and a second pin groove is formed between two adjacent second limiting protrusions. The second limiting protrusion abuts against or has a gap with the outer peripheral wall of the drive shaft.

[0026] The design of the drive gear and the second pin or the second pin-shaped protrusion enables the circumferential engagement between the drive shaft and the drive gear, thereby allowing the drive gear to drive the slant rod connector to rotate through the transmission mechanism; the design of the circular boss can prevent the body of the drive gear from rubbing against the positioning plate, thus affecting the service life of the drive gear.

[0027] In the aforementioned hand crank device for a sunshade umbrella, there are an even number of second pin slots, which are arranged in a circular array around the central axis of the hand crank shaft. The second pin is cylindrical, with both ends protruding from the outer circumferential surface of the drive shaft. Both ends of the second pin can be inserted into the second pin slot as the drive shaft moves.

[0028] Multiple second pin slots and cylindrical second pins cooperate to make it easier for the second pins to be inserted into the second pin slots, thereby making the adjustment of the driving position of this hand crank device smoother.

[0029] In the aforementioned hand crank device for a sunshade umbrella, a bushing is installed on the rear side of the drive gear. The bushing can abut against the housing and is circumferentially fixed to the housing. The front of the housing is provided with a receiving groove for inserting the drive shaft.

[0030] The bushing and positioning plate work together to firmly fix the position of the drive gear and prevent the drive gear from moving axially; the design of the above-mentioned receiving groove can prevent the drive shaft from directly contacting the housing when it moves forward, which helps to enhance the stability of this hand crank device.

[0031] Compared with the prior art, the technical effects of this utility model are as follows:

[0032] This invention uses a drive shaft that moves back and forth to connect the drive shaft to a rope wheel or a drive gear. When the drive shaft is connected to the rope wheel, turning the rocker handle can control the opening and closing of the umbrella. When the drive shaft is connected to the drive gear, turning the rocker handle can control the rotation of the slant bar (sunshade). Thus, this rocker device can simultaneously control the opening and closing of the umbrella and the rotation of the sunshade. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0034] Figure 2 This is an overall sectional view of the present invention.

[0035] Figure 3 This is a schematic diagram of the internal structure of the shell of this utility model. Figure 1 .

[0036] Figure 4 This is a schematic diagram of the internal structure of the shell of this utility model. Figure 2 .

[0037] Figure 5 The explosion occurred at the drive shaft of this utility model. Figure 1 .

[0038] Figure 6 The explosion occurred at the drive shaft of this utility model. Figure 1 .

[0039] Figure 7 This is a schematic diagram of the structure of the drive gear of this utility model.

[0040] In the diagram, 11. Housing; 111. Receiving groove; 12. Hand crank; 13. Diagonal rod; 2. Drive shaft; 21. First pin; 22. Second pin; 3. Diagonal rod connector; 31. Rope hole; 4. Rope winding wheel; 41. Positioning protrusion; 5. Drive gear; 51. Circular boss; 52. Gear hole; 53. Second limiting protrusion; 54. Second pin groove; 6. Transmission mechanism; 61. Worm gear; 62. Worm; 63. Driven gear; 7. Fixing plate; 71. Through hole; 8. Hand crank shaft; 81. Shaft hole; 82. First limiting protrusion; 83. First pin groove; 84. Positioning groove; 9. Bushing. Detailed Implementation

[0041] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0042] In this utility model, to simplify the drawings, the shapes of the teeth are not shown on the worm gear, worm, driven gear, and driving gear.

[0043] The hand crank mechanism of this sunshade includes a housing 11, a crank handle 12, a drive shaft 2, and a diagonal rod 13. The diagonal rod 13 is fixedly connected to a diagonal rod connector 3 installed on the upper part of the housing 11. The drive shaft 2 is arranged horizontally, with one end inserted into the housing 11 and the other end fixedly connected to the crank handle 12. A rope winding wheel 4 and a drive gear 5 are sleeved on the drive shaft 2. Both the diagonal rod 13 and the diagonal rod connector 3 are provided with rope holes 31 for the umbrella rope to pass through. The rope holes 31 are arranged opposite to the rope winding wheel 4. The drive gear 5 is connected to the diagonal rod connector 3 through a transmission mechanism 6 and drives the diagonal rod connector 3 to rotate. A protrusion extending from the drive shaft 2 is provided on the drive shaft 2. The first pin 21 and the second pin 22 on the circumferential surface or the drive shaft 2 are formed with a first pin-shaped protrusion and a second pin-shaped protrusion protruding from the outer circumferential surface of the drive shaft 2. The rope wheel 4 is fixedly connected or formed with a first pin groove 83 that mates with the first pin or the first pin-shaped protrusion. The drive gear 5 is fixedly connected or formed with a second pin groove 54 that mates with the second pin or the second pin-shaped protrusion. When the first pin or the first pin-shaped protrusion is inserted into the first pin groove 83, the second pin or the second pin-shaped protrusion is separated from the second pin groove 54. When the second pin or the second pin-shaped protrusion is inserted into the second pin groove 54, the first pin or the first pin-shaped protrusion is separated from the first pin groove 83. The hand crank of this sunshade umbrella moves the drive shaft 2 back and forth, thereby connecting the drive shaft 2 to the rope wheel 4 or the drive gear 5. When the drive shaft 2 is connected to the rope wheel 4, turning the hand crank 12 can control the opening and closing of the umbrella surface. When the drive shaft 2 is connected to the drive gear 5, turning the hand crank 12 can control the rotation of the slant bar 13 (sunshade umbrella). Thus, the hand crank can simultaneously control the opening and closing of the umbrella surface and the rotation of the sunshade umbrella.

[0044] Specifically, the crank handle 12 can move left and right. When the crank handle 12 is pulled out so that it is away from the housing 11, rotating the crank handle 12 clockwise will open the umbrella, and rotating the crank handle 12 counterclockwise will close the umbrella.

[0045] Umbrella opening and closing principle: When the crank handle 12 is pulled out, the first pin or first pin-shaped protrusion on the switching shaft engages with the crank shaft 8. When the crank handle 12 is rotated, it drives the drive shaft 2 to rotate, which in turn drives the crank shaft 8 to rotate. The crank shaft 8 drives the rope wheel 4 to rotate (the rope wheel 4 has umbrella rope tied to it). The other end of the umbrella rope is tied to the lower umbrella plate. The rope wheel 4 winds the umbrella rope, which drives the lower umbrella plate to move up and down, thereby achieving the effect of opening and closing the umbrella.

[0046] When the crank handle 12 is pressed in and close to the housing 11, rotating the crank handle 12 clockwise or counterclockwise allows the umbrella surface to rotate left and right, enabling guests to effectively shade themselves according to the position of the sun.

[0047] Umbrella rotation principle: When the crank handle 12 is pressed in, the first pin or first pin-shaped protrusion on the drive shaft 2 disengages from the crank shaft 8, and the second pin or second pin-shaped protrusion meshes with the drive gear 5. When the crank handle 12 is rotated, it drives the drive shaft 2 to rotate, the drive shaft 2 drives the drive gear 5 to rotate, the drive gear 5 drives the inclined rod connector 3 to rotate, the inclined rod connector 3 is fixed to the inclined rod 13, thereby driving the inclined rod 13 to rotate, and the inclined rod 13 drives the entire umbrella surface to rotate, thereby achieving the operation of rotating the umbrella surface left and right.

[0048] like Figure 3 and Figure 4 As shown, the transmission mechanism 6 includes a worm wheel 61, a worm 62, and a driven gear 63. The worm wheel 61 is fixed to the lower part of the inclined rod connector 3. The worm 62 is arranged in the horizontal direction and connected to the worm wheel 61. The driven gear 63 is fixedly connected to the end of the worm 62 and meshes with the driving gear 5.

[0049] The transmission structure of the worm gear 61, worm 62 and driven gear 63 is simple and stable; and the design of the worm 62 can bypass the position of the rope wheel 4, so that it can adapt to the relatively narrow installation space inside the housing 11, making the structure of the entire hand crank device more compact.

[0050] like Figure 5 and Figure 6 As shown, the rope-winding wheel 4 is connected to the front of the drive shaft 2, and the driving gear 5 is connected to the rear of the drive shaft 2. A fixing plate 7 is provided between the rope-winding wheel 4 and the driving gear 5. The fixing plate 7 is fixedly connected to the housing 11, and the fixing plate 7 has a through hole 71 for the drive shaft 2 to pass through. The design of the fixing plate 7 can prevent the rope-winding wheel 4 and the driving gear 5 from moving back and forth when the drive shaft 2 is moved, which is conducive to axial positioning of the rope-winding wheel 4 and the driving wheel, and improves the stability of this hand crank device during use.

[0051] like Figure 2-5As shown, a hand crank shaft 8 is provided at the front of the winding wheel 4. A shaft hole 81 is provided inside the hand crank shaft 8. The radius of the shaft hole 81 is greater than the maximum distance between the first pin and the central axis of the drive shaft 2, or the radius of the shaft hole 81 is greater than the maximum distance between the first pin-shaped protrusion and the central axis of the drive shaft 2. Several first limiting protrusions 82 are provided circumferentially on the inner wall of the rear part of the shaft hole 81. A first pin groove 83 is formed between two adjacent first limiting protrusions 82. The first limiting protrusions 82 abut against or have a gap with the outer peripheral wall of the drive shaft 2. There are an even number of first pin slots 83, which are arranged in a circular array around the central axis of the hand crank shaft 8. The first pin is cylindrical, and both ends of the first pin protrude from the outer circumferential surface of the drive shaft 2. Both ends of the first pin can be inserted into the first pin slot 83 as the drive shaft 2 moves. A forward-protruding positioning protrusion 41 is provided on the front side of the rope wheel 4, and a positioning groove 84 that cooperates with the positioning protrusion 41 is provided on the outer circumferential surface of the hand crank shaft 8. The arc length of the positioning groove 84 is greater than the arc length of the positioning protrusion 41.

[0052] The design of the aforementioned hand crank shaft 8 and the first pin or first pin-shaped protrusion enables the circumferential engagement of the drive shaft 2 and the hand crank shaft 8, allowing the rope winding wheel 4 connected to the hand crank shaft 8 to rotate with the drive shaft 2. The multiple first pin grooves 83 and the cylindrical first pin engage, making it easier for the first pin to be inserted into the first pin groove 83, thus making the adjustment of the drive position of this hand crank device smoother. The positioning protrusion 41 of the rope winding wheel 4 engages with the positioning groove 84 of the hand crank shaft 8, allowing the groove wall of the positioning groove 84 to abut against the positioning protrusion 41 and drive the rope winding wheel 4 to rotate. At the same time, the design that the arc length of the positioning groove 84 is greater than the arc length of the positioning protrusion 41 allows for a certain gap between the two, thus providing a certain buffer space when the rope winding wheel 4 winds the paracord, preventing the paracord from breaking due to excessive tightness.

[0053] like Figure 2-6As shown, a circular boss 51 is formed on the front side of the drive gear 5. The front side of the circular boss 51 abuts against the fixing plate 7. A gear hole 52 is provided on the drive gear 5, which passes through it from front to back. The radius of the gear hole 52 is greater than the maximum distance between the second pin and the central axis of the drive shaft 2, or the radius of the gear hole 52 is greater than the maximum distance between the second pin-shaped protrusion and the central axis of the drive shaft 2. Several second limiting protrusions 53 are arranged circumferentially on the inner wall of the front part of the gear hole 52. A second pin groove 54 is formed between two adjacent second limiting protrusions 53. The second limiting protrusions 53 abut against or have a gap with the outer peripheral wall of the drive shaft 2. There are an even number of second pin grooves 54. The second pin grooves 54 are arranged in a circular array with the central axis of the hand crank shaft 8 as the center. The second pin is cylindrical. Both ends of the second pin protrude from the outer peripheral surface of the drive shaft 2. Both ends of the second pin can be inserted into the second pin groove 54 as the drive shaft 2 moves. The design of the drive gear 5 and the second pin or second pin-shaped protrusion enables the circumferential engagement of the drive shaft 2 and the drive gear 5, thereby allowing the drive gear 5 to drive the inclined rod connector 3 to rotate through the transmission mechanism 6; the design of the circular boss 51 can prevent the body of the drive gear 5 from rubbing against the positioning plate, thus affecting the service life of the drive gear 5; the multiple second pin grooves 54 and the cylindrical second pin cooperate to make it easier for the second pin to be inserted into the second pin grooves 54, thereby making the adjustment of the drive position of this hand crank device smoother.

[0054] Furthermore, a bushing 9 is installed on the rear side of the drive gear 5. The bushing 9 abuts against the housing 11 and is circumferentially fixed to the housing 11. The front of the housing 11 is provided with a receiving groove 111 for the drive shaft 2 to be inserted. The bushing 9 and the positioning plate cooperate to firmly fix the position of the drive gear 5 and prevent the drive gear 5 from moving axially. The design of the receiving groove 111 can prevent the drive shaft 2 from directly contacting the housing 11 when it moves forward, which helps to enhance the stability of this hand crank device.

[0055] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection defined by the claims of the present utility model.

Claims

1. A crank handle device for a sun shade, characterized by: The device includes a housing (11), a crank handle (12), a drive shaft (2), and a diagonal rod (13). The diagonal rod (13) is fixedly connected to a diagonal rod connector (3) installed on the upper part of the housing (11). The drive shaft (2) is arranged in a horizontal direction. One end of the drive shaft (2) is inserted into the housing (11), and the other end is fixedly connected to the crank handle (12). A rope winding wheel (4) and a drive gear (5) are sleeved on the drive shaft (2). Both the diagonal rod (13) and the diagonal rod connector (3) are provided with rope holes (31) for the rope to pass through. The rope holes (31) are arranged opposite to the rope winding wheel (4). The drive gear (5) is connected to the diagonal rod connector (3) through a transmission mechanism (6) and drives the diagonal rod connector (3) to rotate. The drive shaft (2) is equipped with... There is a first pin (21) and a second pin (22) protruding from the outer peripheral surface of the drive shaft (2), or the drive shaft (2) is formed with a first pin-shaped protrusion and a second pin-shaped protrusion protruding from the outer peripheral surface of the drive shaft (2). The rope wheel (4) is fixedly connected or formed with a first pin groove (83) that cooperates with the first pin or the first pin-shaped protrusion. The drive gear (5) is fixedly connected or formed with a second pin groove (54) that cooperates with the second pin or the second pin-shaped protrusion. When the first pin or the first pin-shaped protrusion is inserted into the first pin groove (83), the second pin or the second pin-shaped protrusion is separated from the second pin groove (54). When the second pin or the second pin-shaped protrusion is inserted into the second pin groove (54), the first pin or the first pin-shaped protrusion is separated from the first pin groove (83).

2. The hand crank device for a sunshade umbrella according to claim 1, characterized in that: The transmission mechanism (6) includes a worm wheel (61), a worm (62) and a driven gear (63). The worm wheel (61) is fixed to the lower part of the inclined rod connector (3). The worm (62) is arranged in the horizontal direction and connected to the worm wheel (61). The driven gear (63) is fixedly connected to the end of the worm (62) and meshes with the driving gear (5).

3. The hand crank device for a sunshade umbrella according to claim 1, characterized in that: The winding wheel (4) is connected to the front of the drive shaft (2), the drive gear (5) is connected to the rear of the drive shaft (2), a fixing plate (7) is provided between the winding wheel (4) and the drive gear (5), the fixing plate (7) is fixedly connected to the housing (11), and the fixing plate (7) is provided with a through hole (71) for the drive shaft (2) to pass through.

4. The hand crank device for a sunshade umbrella according to claim 1, characterized in that: The front part of the winding wheel (4) is provided with a hand crank shaft (8), and the hand crank shaft (8) is provided with a shaft hole (81). The radius of the shaft hole (81) is greater than the maximum distance between the first pin and the central axis of the drive shaft (2), or the radius of the shaft hole (81) is greater than the maximum distance between the first pin-shaped protrusion and the central axis of the drive shaft (2). Several first limiting protrusions (82) are provided on the inner wall of the rear part of the shaft hole (81) along its circumferential direction. A first pin groove (83) is formed between two adjacent first limiting protrusions (82). The first limiting protrusions (82) abut against or have a gap with the outer peripheral wall of the drive shaft (2).

5. The hand crank device for a sunshade umbrella according to claim 4, characterized in that: There is an even number of first pin slots (83). The first pin slots (83) are arranged in a ring array with the central axis of the hand crank shaft (8) as the center. The first pin is cylindrical. Both ends of the first pin protrude from the outer circumference of the drive shaft (2). Both ends of the first pin can be inserted into the first pin slot (83) as the drive shaft (2) moves.

6. The hand crank device for a sunshade umbrella according to claim 4, characterized in that: The front side of the rope wheel (4) is provided with a forward-protruding positioning protrusion (41), and the outer peripheral surface of the hand crank shaft (8) is provided with a positioning groove (84) that cooperates with the positioning protrusion (41). The arc length of the positioning groove (84) is greater than the arc length of the positioning protrusion (41).

7. A hand crank device for a sunshade umbrella according to any one of claims 1-6, characterized in that: The front side of the drive gear (5) is formed with a circular boss (51). The front side of the circular boss (51) abuts against the fixing piece (7). The drive gear (5) is provided with a gear hole (52) that passes through it from front to back. The radius of the gear hole (52) is greater than the maximum distance between the second pin and the central axis of the drive shaft (2), or the radius of the gear hole (52) is greater than the maximum distance between the second pin-shaped protrusion and the central axis of the drive shaft (2). Several second limiting protrusions (53) are arranged circumferentially on the inner wall of the front part of the gear hole (52). A second pin groove (54) is formed between two adjacent second limiting protrusions (53). The second limiting protrusions (53) abut against or have a gap with the outer peripheral wall of the drive shaft (2).

8. The hand crank device for a sunshade umbrella according to claim 7, characterized in that: There are an even number of second pin slots (54). The second pin slots (54) are arranged in a ring array with the central axis of the hand crank shaft (8) as the center. The second pin is cylindrical. Both ends of the second pin protrude from the outer circumference of the drive shaft (2). Both ends of the second pin can be inserted into the second pin slot (54) as the drive shaft (2) moves.

9. A hand crank device for a sunshade umbrella according to any one of claims 1-6, characterized in that: A bushing (9) is installed on the rear side of the drive gear (5). The bushing (9) can abut against the housing (11). The bushing (9) is circumferentially fixed to the housing (11). The front part of the housing (11) is provided with a receiving groove (111) for the drive shaft (2) to be inserted.

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