Adjustable arm for a rider type electric stacker truck

Abstract

The utility model discloses a kind of regulating type arm guards of station driving type electric stacker truck, it includes the base mounted on vehicle body, arm body is movably installed on base, lock tongue assembly is installed on base, lock tongue assembly includes the lock tongue of rotation setting;The arm body includes lock body shaft and lock body;Unlocking assembly is movably sheathed on the lock body shaft at lock body side;After rotating arm body, the lock body assembly, unlocking assembly respectively with lock tongue are matched and abut, to adjust the position of arm body;The distance between the rotation center of adjusting lock tongue and lock body shaft, to adjust the height of arm body in working condition.The utility model is matched and abut by lock body assembly, unlocking assembly respectively with lock tongue, so that arm body is adjusted in initial state one, lifting state two, position three of state three of turning up.Adjust the height of arm body in working condition by adjusting the distance between the rotation center of lock tongue in lock tongue assembly and lock body shaft.

Description

Technical Field

[0001] This utility model relates to the field of stand-on stacker truck technology, and in particular to the adjustable guard arm of a stand-on electric stacker truck. Background Technology

[0002] Electric stacker trucks are increasingly used as core equipment in warehousing and logistics. Among them, the folding pallet stacker truck is a variant that can simultaneously meet both low-speed and high-speed driving requirements. When traveling at high speed, it is equipped with foldable pedals and protective arm guards to protect the driver from being thrown out of the vehicle. During stacking operations, the operator needs to face the gantry. To prevent the driver's escape routes on both sides from being obstructed and thus injured by falling objects, the arm guards should be lowered inward or flipped upward outward after reaching a height of 1.8m to ensure that the escape routes on both sides of the driver are unobstructed.

[0003] There are two main types of existing arm guard structures: the first is the double-door type, which requires operators to get on and off the vehicle to switch between arm guards during driving and stacking, making operation inconvenient; the second is the lift-type arm guard, which is raised during driving and lowered during stacking, requiring bending over during the lifting action, affecting user experience and efficiency. Furthermore, most arm guards on the market have a fixed height, set by the manufacturer and not adjustable, failing to accommodate the needs of different heights and usage habits.

[0004] Therefore, it is necessary to design a rotatable and height-adjustable arm guard to simplify its operation and adapt to the usage needs of different drivers. Utility Model Content

[0005] Based on the above-mentioned technical problems, this utility model proposes an adjustable guard arm for a stand-on electric stacker truck, which facilitates adjustment of its position and height, thereby optimizing the user experience of the guard arm.

[0006] The specific technical solution of this utility model is as follows:

[0007] An adjustable guard arm for a stand-on electric stacker truck includes a base mounted on the truck body, a guard arm body movably mounted on the base, and a locking tongue assembly mounted on the base, the locking tongue assembly including a rotatably disposed locking tongue; the guard arm body includes a lock body assembly, the lock body assembly including a lock body shaft and a lock body fixed to the outer periphery of the lock body shaft and adapted to the locking tongue; an unlocking component is movably sleeved on the lock body shaft located on one side of the lock body; after rotating the guard arm body, the lock body assembly and the unlocking component respectively cooperate and abut with the locking tongue, thereby adjusting the position of the guard arm body; adjusting the distance between the rotation center of the locking tongue and the lock body shaft, thereby adjusting the height of the guard arm body in the working state.

[0008] In a further embodiment, the base includes a base body, a pair of mounting seats are symmetrically fixed on the upper end of the base body, a shaft cover is connected above the mounting seats, and the arm guard body is movably disposed in a mounting cavity limited by the mounting seats and the shaft cover.

[0009] In a further embodiment, the latch assembly also includes a base mounted on the base, with the latch rotatably mounted on the top surface of the base. The base includes an upper crossbeam, a movable crossbeam, and a lower crossbeam arranged sequentially. A guide shaft is movably threaded through the movable crossbeam, with both ends of the guide shaft fixedly connected to the upper and lower crossbeams, respectively. A screw is threadedly connected to the middle of the movable crossbeam, with the movable end of the screw passing through the upper or lower crossbeam and located outside the base. Rotating the movable end of the screw causes the movable crossbeam to move between the upper and lower crossbeams, thereby changing the distance between the latch rotation center and the lock body shaft, and thus adjusting the height of the guard arm body in the working state.

[0010] In a further embodiment, a latch shaft seat is fixedly installed on the outer wall of the movable crossbeam, and the latch is mounted on the latch shaft seat via a pin, allowing the latch to rotate around the pin; a torsion spring is sleeved on the pin located between the latch and the latch shaft seat for latch reset.

[0011] In a further embodiment, a left guard arm and a right guard arm are fixedly connected to both ends of the lock body shaft, respectively; a left limiting block is installed on the left guard arm, and a right limiting block is installed on the right guard arm. The left and right limiting blocks are used to limit the axial movement of the guard arm body.

[0012] A left locking block is fixed on the base body located below the side of the arm guard body; when the arm guard body is rotated, the arm guard body stops rotating when the left limit block contacts the left locking block.

[0013] In a further embodiment, a limiting component is fixed on the lock body shaft, and the unlocking component is located between the lock body and the limiting component; the unlocking component includes an unlocking ring disposed on one side of the lock body, and an assembly groove is opened on one side of the lock body, with a lock body ball connected inside the assembly groove via an elastic element; an unlocking ring ball is embedded in one side of the unlocking ring; the lock body ball and the unlocking ring ball are arranged opposite to each other, and when the lock body is rotated, the lock body ball connects with the unlocking ring ball and drives the unlocking ring to rotate together.

[0014] Preferably, the unlocking component further includes a limiting ring, and the unlocking ring and the limiting ring are connected by a connector; the connector includes a fixing bolt and a connecting limiting post, wherein one end of the connecting limiting post extends to the outer surface of the unlocking ring and contacts the lock body; when the end face of the lock body rotates to the position of the connecting limiting post, the two contact each other, and when it continues to rotate, the lock body will rotate together with the unlocking ring.

[0015] The unlocking ring has an irregular shape, with its outer circumference formed by connecting an outer arc segment and an inner curve segment. A toothed groove is formed at the connection point between the outer arc segment and the inner curve segment to engage with the lock tongue. The diameter of the outer arc segment is larger than the diameter of the protruding end of the lock body, and the diameter of the inner curve segment is smaller than the diameter of the smooth end of the lock body. A first limiting block and a second limiting block protruding outward are fixed on the outer circumferential wall of the limiting ring.

[0016] Preferably, in a further embodiment, a spherical mounting groove is provided on one side of the unlocking ring, and the spherical part of the unlocking ring is embedded in the spherical mounting groove; an unlocking ring shaft hole for fitting onto the lock body shaft is provided at the center of the unlocking ring, and a bearing is installed on the wall of the unlocking ring shaft hole; a bearing limiting block is fixed on the lock body shaft;

[0017] The limiting assembly includes a retaining ring and a limiting screw fixed side by side on the lock body shaft.

[0018] In a further embodiment, the lock body has a semi-arc structure, and the arc structure of its inner surface matches the lock body axis; the two ends parallel to the lock body axis are a protruding end and a smooth end, the end face of the smooth end is the lock body return surface, which contacts the limiting component; the outer surface of the protruding end is provided with a lock groove that engages with the lock tongue.

[0019] Compared with the prior art, the beneficial technical effects of this utility model are as follows:

[0020] 1. This utility model achieves position adjustment of the guard arm body through the cooperation and abutment of the lock body assembly and unlocking assembly with the lock tongue, allowing the guard arm body to have at least four position states: Initial lowered state one (handrail vertically downwards towards the inside), raised state two (handrail horizontal), flipped up state three (handrail outwards), and a transitional state four between raised state two and flipped up state three. State one is the parking state, raised state two is the working state, and state three is the stacked state. During long-term operation, the driver only needs to switch between state two and state three, avoiding the need to bend over to raise the guard arm. Furthermore, by introducing state four, the guard arm can return from state two to state one.

[0021] 2. When the arm guard is in the raised position (position two), the height of the arm guard in the working state can be adjusted by adjusting the distance between the rotation center of the latch in the latch assembly and the lock body shaft. This adapts to the usage habits of operators of different heights, enhancing their adaptability and comfort.

[0022] 3. In this utility model, the rotation angle of the arm guard body is limited by the left limit block and the left locking block, as well as by the unlocking ring and the limit ring in the unlocking component, so that the arm guard body can rotate forward and backward within a certain angle, which improves adaptability and avoids misoperation.

[0023] 4. In this utility model, the lock body and the unlocking component are connected by a lock body sphere and an unlocking ring sphere, so that when rotated, the lock body rotates along with the unlocking ring. Then, the lock body sphere retracts into the assembly groove under the action of external force, thus separating from the unlocking ring, thereby achieving the separation between the lock body and the unlocking component. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of this utility model;

[0025] Figure 2 for Figure 1 Top view;

[0026] Figure 3 This is a schematic diagram of the assembly structure of the arm guard body and the unlocking ring assembly in this utility model;

[0027] Figure 4 for Figure 3 A sectional view;

[0028] Figure 5 This is a schematic diagram of the unlocking ring in this utility model;

[0029] Figure 6 This is a schematic diagram of the limiting ring in this utility model;

[0030] Figure 7 This is a schematic diagram of the locking tongue assembly in this utility model;

[0031] Figure 8 This is a cross-sectional view of the latch assembly in this utility model;

[0032] Figure 9 This is a schematic diagram of the lock body in this utility model;

[0033] Figure 10 This is a schematic diagram showing the cooperation between the lock body, the lock tongue, and the unlocking ring in this utility model;

[0034] Figure 11 This is a schematic diagram of the initial lowered state of the arm guard body in this utility model;

[0035] Figure 12 This is a schematic diagram of the second raised state of the arm guard body in this utility model;

[0036] Figure 13 This is a schematic diagram of the arm guard body in the upward flipped state of this utility model;

[0037] Figure 14 This is a schematic diagram of the transition state four of the arm guard body in this utility model;

[0038] Figure 15This is a schematic diagram showing the lowest position of the arm guard body in the second raised state of this utility model.

[0039] Figure 16 This is a schematic diagram of the highest position of the arm guard body in the second raised state of this utility model.

[0040] In the diagram: 1. Base; 11. Base body; 12. Mounting seat; 13. Left locking block; 14. Shaft cover;

[0041] 2. Locking tongue assembly; 21. Upper crossbeam; 22. Lower crossbeam; 23. Movable crossbeam; 24. Pin; 25. Locking tongue; 26. Torsion spring; 27. Guide shaft; 28. Screw; 29. ​​Locking tongue shaft seat;

[0042] 3. Guard arm body; 31. Left guard arm; 32. Right guard arm; 33. Lock body assembly; 34. Lock body shaft; 35. Lock body; 351. Lock groove; 352. Lock body return surface; 36. Spring; 37. Lock body ball; 38. Left limit block; 39. Right limit block;

[0043] 4. Unlocking component; 41. Unlocking ring; 411. Toothed groove; 412. Unlocking ring shaft hole; 413. Spherical mounting groove; 414. Bolt hole; 415. Outer arc segment; 416. Inner curve segment; 42. Limiting ring; 421. First limiting block; 422. Second limiting block; 423. Limiting ring shaft hole; 43. Bearing; 44. Bearing limiting block; 45. Retaining ring; 46. Connecting piece; 47. Unlocking ring sphere. Detailed Implementation

[0044] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0045] Example 1:

[0046] refer to Figure 1-16This embodiment provides an adjustable guard arm for a stand-on electric stacker truck, which includes a base 1 mounted on the vehicle body. A guard arm body 3 is movably mounted on the base 1, and a locking tongue assembly 2 is mounted on the base 1. The locking tongue assembly 2 includes a rotatably mounted locking tongue 25. The guard arm body 3 includes a lock body assembly 33, which includes a lock body shaft 34 and a lock body 35 fixed to the outer periphery of the lock body shaft 34 and adapted to the locking tongue 25. An unlocking assembly 4 is movably sleeved on the lock body shaft 34 located on one side of the lock body 35. After rotating the guard arm body 3, the lock body assembly 33 and the unlocking assembly 4 respectively engage with the locking tongue 25 to adjust the position of the guard arm body 3. Adjusting the distance between the rotation center of the locking tongue 25 and the lock body shaft 34 adjusts the height of the guard arm body in the working state.

[0047] In this embodiment, the arm guard body 3 has the following positions: the arm guard body's handrail is placed vertically downwards towards the inside as the initial lowered state one; the handrail is in a horizontal position as the raised state two; the handrail is placed outwards as the upward flipped state three; and there is a transitional state four between the raised state two and the upward flipped state three. Among them, the raised state two is the working state.

[0048] In the working state, the locking tongue 25 docks with the lock body 35, and the distance between the rotation center of the locking tongue 25 and the lock body shaft 34 is adjusted, thereby adjusting the height of the guard arm body in the working state, and achieving the purpose of adjusting the height.

[0049] like Figure 1 , 2 As shown, the base 1 includes a base body 11, and a pair of mounting seats 12 are symmetrically fixed on the upper end of the base body 11. A shaft cover 14 is connected above the mounting seats 12. The guard arm body 3 is movably disposed in a mounting cavity limited by the mounting seats 12 and the shaft cover 14. A bearing can be installed inside the mounting cavity, allowing the guard arm body to rotate freely on the mounting seats.

[0050] like Figure 7 , 8As shown, the latch assembly 2 also includes a base mounted on the base 1, and the latch 25 is rotatably mounted on the top surface of the base. The base includes an upper crossbeam 21, a movable crossbeam 23, and a lower crossbeam 22 arranged sequentially. A guide shaft 27 is movably inserted through the movable crossbeam 23, and the two ends of the guide shaft 27 are fixedly connected to the upper crossbeam 21 and the lower crossbeam 22, respectively. A screw 28 is threadedly connected to the middle of the movable crossbeam 23. The movable end of the screw 28 passes through the upper crossbeam 21 or the lower crossbeam 22 and is located outside the base. Rotating the movable end of the screw 28 causes the movable crossbeam 23 to move between the upper crossbeam 21 and the lower crossbeam 22, thereby changing the distance between the rotation center of the latch 25 and the lock body shaft 34, and thus adjusting the height of the guard arm body in the working state. The spacing between the upper and lower crossbeams and the size of the latch 25 can be designed by adjusting the height as needed. Those skilled in the art can design such a system based on the technical solution of this utility model and in combination with working conditions and common sense, which will not be elaborated here.

[0051] Specifically, a latch bearing seat 29 is fixedly installed on the outer wall of the movable crossbeam 23, and the latch 25 is mounted on the latch bearing seat 29 via a pin 24, so that the latch 25 can rotate around the pin 24; a torsion spring 26 is sleeved on the pin 24 located between the latch 25 and the latch bearing seat 29 for the latch to reset.

[0052] In this embodiment, the base is placed horizontally, specifically as follows: Figure 1 As shown. The upper crossbeam 21 is located at the outer front of the guard arm body, the lower crossbeam 22 is located on the inner side of the guard arm body, and the latch 25 is located between the base and the guard arm body, contacting the lock body 35. Under the engagement and actuation of the lock body 35, the latch 25 can rotate around the pin 24; when the latch 25 disengages, the torsion spring 26 can reset the latch.

[0053] like Figure 3 As shown, the lock body shaft 34 has a left guard arm 31 and a right guard arm 32 fixedly connected to its two ends respectively. The left guard arm 31 and the right guard arm 32 can be designed as an L-shaped structure, forming a semi-enclosed handrail after connection. When the handrail is in a horizontal position, it is in the raised state, which is the working state, protecting the operator. A left limit block 38 is installed on the left guard arm 31, and a right limit block 39 is installed on the right guard arm 32. The left and right limit blocks are located between the two mounting seats 12 and are used to limit the axial movement of the guard arm body 3 to prevent it from tilting to one side and failing to provide protection.

[0054] A left locking block 13 is fixed on the base body 11 located below the side of the arm guard body 3. The left limiting block 38 has an arc-shaped structure and is fixed on the left arm guard 31. The left locking block 13 is on the rotation circumference of the left limiting block 38. When the arm guard body 3 is rotated, the arm guard body 3 stops rotating when the left limiting block 38 contacts the left locking block 13. That is, the forward and reverse rotation of the arm guard body 3 is limited by a certain angle, such as setting its maximum rotation angle to 180-270°.

[0055] like Figure 3 , 4 As shown, a limiting component is fixed on the lock body shaft 34, and an unlocking component 4 is located between the lock body 35 and the limiting component. The unlocking component 4 includes an unlocking ring 41 disposed on one side of the lock body 35. A mounting groove is formed on one side of the lock body 35, and a lock body ball 37 is connected inside the mounting groove through an elastic element. In this embodiment, the elastic element is preferably a spring 36. An unlocking ring ball 47 is embedded in one side of the unlocking ring 41. The lock body ball 37 and the unlocking ring ball 47 are arranged opposite to each other. When the lock body 35 is rotated, the lock body ball 37 connects with the unlocking ring ball 47 and drives the unlocking ring 41 to rotate together. Under normal conditions, the lock body ball 37 is located outside the mounting groove and will contact the unlocking ring ball 47. When compression occurs, the spring 36 will be compressed, and the lock body ball 37 will enter the interior of the mounting groove and will not contact the unlocking ring ball 47.

[0056] like Figure 4-6 As shown, the unlocking component 4 also includes a limiting ring 42. The unlocking ring 41 and the limiting ring 42 are connected by a connector 46. The connector 46 includes a fixing bolt and a connecting limiting post. One end of the connecting limiting post extends to the outer surface of the unlocking ring 41 and contacts the lock body 35 to limit its movement. That is, two bolt holes 414 are provided on both sides of the unlocking ring 41 and the limiting ring 42. One bolt hole is used for the fixing bolt to pass through and connect the unlocking ring 41 and the limiting ring 42. The other bolt hole is used for the connecting limiting post to pass through and connect the unlocking ring 41 and the limiting ring 42. One end of the connecting limiting post extends to the outer surface of the unlocking ring 41. When the end face of the lock body 35 rotates to the position of the connecting limiting post, the two contacts each other. When the lock body 35 continues to rotate, the unlocking ring 41 will rotate together with it.

[0057] like Figure 5As shown, the unlocking ring 41 has an irregular shape, and its outer circumference is formed by connecting an outer arc segment 415 and an inner curve segment 416. At the connection between the outer arc segment 415 and the inner curve segment 416, a toothed groove 411 is formed to engage with the latch 25. The diameter of the outer arc segment 415 is larger than the diameter of the protruding end of the lock body 35, and the diameter of the inner curve segment 415 is smaller than the diameter of the smooth end of the lock body 35. Therefore, when the lock body is rotated and the unlocking assembly 4 is driven together, when the outer arc segment 415 of the unlocking ring 41 rotates to the latch, the latch will move relative to the outer circumference of the outer arc segment 415, thus passing over the protruding end of the lock body. When the inner curve segment 416 of the unlocking ring 41 rotates to the latch, the latch will return to its original position under the force of the torsion spring and fall onto the lock body, thus moving relative to the outer circumference of the lock body.

[0058] One side of the unlocking ring 41 has a spherical mounting groove 413, and the unlocking ring sphere 47 is embedded in the spherical mounting groove 413. The center of the unlocking ring 41 has an unlocking ring shaft hole 412 for fitting onto the lock body shaft 34. A bearing 43 is installed on the hole wall of the unlocking ring shaft hole 412, so that the unlocking ring 41 can rotate freely around the lock body shaft 34. A bearing limiting block 44 is fixed on the lock body shaft 34 to limit the radial movement of the unlocking ring 41. The bearing 43 can be fixed on the hole wall of the unlocking ring shaft hole 412 through a bearing mounting groove. The bearing mounting groove and the bearing limiting block 44 together limit the left and right movement of the bearing 43.

[0059] like Figure 6 As shown, a limiting ring 42 has a limiting ring shaft hole 423 at its center, which passes through the lock body shaft. A first limiting block 421 and a second limiting block 422 protruding outwards are fixed on the circumferential outer wall of the limiting ring 42. The first limiting block 421 and the second limiting block 422 are located on both sides of the upper crossbeam 21 of the latch assembly 2, with the first limiting block 421 located at the front end of the upper crossbeam 21 and the second limiting block 422 located between the upper crossbeam 21 and the latch 25. The rotation of the first limiting block 421 and the second limiting block 422 is limited by the upper crossbeam 21, thereby restricting the rotation direction and angle of the unlocking assembly 4.

[0060] Specifically, the limiting ring 42 is located on the side away from the lock body and is fixedly connected to the unlocking ring 41 as a whole. When rotating, the lock body 35 and the unlocking ring 41 will come into contact with the bolt 25, while the limiting ring 42 will not come into contact with the bolt 25. The first limiting block 421 and the second limiting block 422 in the limiting ring 42 will abut against the upper crossbeam 21 of the bolt assembly 2 to produce a limiting effect, and will not come into contact with the bolt 25.

[0061] like Figure 9As shown, the lock body 35 has a semi-arc structure, and the arc structure of its inner surface matches the lock body shaft 34. Parallel to the lock body shaft 34 are a protruding end and a smooth end. The end face of the smooth end is the lock body return surface 352, which contacts the connecting piece 46. The outer surface of the protruding end has a lock groove 351 that engages with the latch 25. The latch 25 also has an arc structure. Its fixed end is connected by a pin, and its movable end extends towards the upward beam 21. During overall rotation, the latch is always in contact with the outer ring of the lock body or the unlocking ring. When it contacts the lock body 35 or the unlocking ring 41, it rotates around the pin 24, where the torsion spring 26 exerts a return or reset pulling force on the latch 25.

[0062] In this embodiment, the arm guard body is as follows: Figure 11 When initially lowered, the armrest of the guard arm body 3 is placed vertically downwards and inwards, the protruding end of the lock body 35 contacts the movable end of the lock tongue 25, and lifts the movable end of the lock tongue 25; the lock tongue 25, the protruding end of the lock body 35 and the inner curve segment of the unlocking ring are arranged longitudinally and aligned; the lower end of the left limiting block 38 on the guard arm body 3 is mounted on the top of the left locking block 13.

[0063] At this time, the guard arm body 3 is rotated in the direction of extension of the smooth end of the lock body 35, causing the lock body 35 to rotate. Since the lower end of the left limiting block 38 is restricted by the left locking block 13, it cannot rotate. Meanwhile, the guard arm body 3 is rotated in the direction of extension of the protruding end of the lock body 35, causing the lock body 35 to rotate as well. When the lock groove 351 on the protruding end of the lock body 35 rotates to the position of the latch 25, the latch 25 returns to its original position under the force of the torsion spring 26 and is locked in the lock groove 351, preventing the guard arm body 3 from rotating in the opposite direction. At this time, the guard arm body is in the second raised state (e.g., Figure 12 (as shown)

[0064] When in the second raised state, rotating the screw 28 moves the movable crossbeam 23, causing the distance between the rotation center of the locking tongue 25 and the lock body shaft 34 to decrease or increase, thereby raising or lowering the height of the guard arm body 3 in the second raised state. This can accommodate the needs of people of different heights, and the same operator can adjust the height of the guard arm at any time to adapt to the operator's balance when the center of gravity is tilted forward or backward when handling high or low goods.

[0065] When in the second lifted state, continue rotating in the same direction. When the lock body ball 37 on the lock body 35 moves to the position of the unlocking ring ball 47 on the unlocking assembly 4, the two connect and drive the unlocking assembly 4 to rotate together. When the tooth groove 411 on the unlocking ring 41 contacts the lock tongue 25, if the rotation continues in the same direction, the guard arm body 3 will be in the third upturned state (as shown in the image). Figure 13 (As shown); if rotated in the opposite direction, the arm guard body 3 will return to the lowered state 1.

[0066] In step S3, in the upward flip state three, the guard arm body 3 is rotated in the opposite direction (i.e., towards the smooth end of the lock body). When the lock body ball 37 on the lock body 35 rotates to the position of the unlocking ring ball 47, it drives the unlocking assembly 4 to rotate together; the tooth groove 411 on the unlocking ring 41 slides past the latch 25 and rotates to the inner curve section; when the second limiting block 422 on the limiting ring 42 contacts the top surface of the upper crossbeam of the base of the latch assembly 2 (e.g. Figure 13 As shown), the unlocking component 4 is prevented from continuing to rotate, while the guard arm body 3 and lock body 35 continue to rotate, squeezing the lock body ball 37 into the assembly groove and separating it from the unlocking ring ball 47; the latch 25 returns to its original position under the action of the torsion spring 26 and falls onto the lock body until the lock groove 351 on the protruding end of the lock body 35 engages with the latch 25. At this time, the guard arm body 3 can no longer rotate in the same direction and returns to the raised state.

[0067] That is, the arm guard body can transform between three states, which improves its applicability.

[0068] Example 2:

[0069] The adjustment process of the adjustable guard arm of a stand-on electric stacker truck is as follows:

[0070] S1, the arm guard body is in the initial lowered state (as shown in...) Figure 11 When (as shown), the armrest of the guard arm body 3 is placed vertically downwards and inwards, the protruding end of the lock body 35 contacts the movable end of the lock tongue 25, and lifts the movable end of the lock tongue 25; the lock tongue 25, the protruding end of the lock body 35 and the inner curve segment of the unlocking ring are arranged longitudinally and aligned; the lower end of the left limiting block 38 on the guard arm body 3 is mounted on the top of the left locking block 13;

[0071] Rotate the guard arm body 3 with the extension direction of the smooth end of the lock body 35 as the rotation direction, and drive the lock body 35 to rotate. However, the lower end of the left limit block 38 cannot rotate because it is restricted by the left locking block 13.

[0072] S2. Rotate the guard arm body 3 in the direction of extension of the protruding end of the lock body 35, causing the lock body 35 to rotate together; when the lock groove 351 on the protruding end of the lock body 35 rotates to the position of the lock tongue 25, the lock tongue 25 returns to its original position under the force of the torsion spring 26 and is stuck in the lock groove 351, preventing the guard arm body 3 from rotating in the opposite direction. At this time, the guard arm body is in the second raised state (as shown in the image). Figure 12 (as shown)

[0073] S3. Continue rotating in the same direction. When the lock body ball 37 on the lock body 35 moves to the position of the unlocking ring ball 47 on the unlocking assembly 4, the two connect and drive the unlocking assembly 4 to rotate together. When the tooth groove 411 on the unlocking ring 41 contacts the lock tongue 25, if the rotation continues in the same direction, the guard arm body 3 will be in the upward flip state (e.g., ...). Figure 13(As shown); if rotated in the opposite direction, the arm guard body 3 will return to the lowered state 1.

[0074] S4. In the upward flip state three of step S3, rotate the guard arm body 3 in the opposite direction (i.e., rotate towards the smooth end of the lock body). When the lock body ball 37 on the lock body 35 rotates to the position of the unlocking ring ball 47, it drives the unlocking assembly 4 to rotate together; the tooth groove 411 on the unlocking ring 41 slides past the lock tongue 25 and rotates to the inner curve section; when the second limiting block 422 on the limiting ring 42 contacts the top surface of the upper crossbeam of the base of the lock tongue assembly 2 (e.g. Figure 13 As shown), the unlocking component 4 is prevented from continuing to rotate, while the guard arm body 3 and lock body 35 continue to rotate, squeezing the lock body ball 37 into the assembly groove and separating it from the unlocking ring ball 47; the latch 25 returns to its original position under the action of the torsion spring 26 and falls onto the lock body until the lock groove 351 on the protruding end of the lock body 35 engages with the latch 25. At this time, the guard arm body 3 can no longer rotate in the same direction and returns to the raised state.

[0075] Specifically, in step S3, when the toothed groove 411 on the unlocking ring 41 contacts the locking tongue 25, the guard arm body 3 continues to rotate in the same direction, and the locking tongue 25 moves along the outer arc of the unlocking ring 41 until the first limiting block 421 on the limiting ring 42 contacts the base of the locking tongue assembly 2 (i.e., the top surface of the upper crossbeam), preventing the unlocking assembly 4 from continuing to rotate, while the guard arm body 3 and the lock body 35 continue to rotate, squeezing the lock body ball 37 into the assembly groove and separating it from the unlocking ring ball 47; when the left limiting block 38 on the guard arm body 3 contacts the left locking block 13 installed on the base 1, the guard arm body 3 cannot continue to rotate at this time, and the guard arm body is in the upward flip state three.

[0076] Specifically, in step S3, when the toothed groove 411 on the unlocking ring 41 contacts the bolt 25, the guard arm body 3 is rotated in the opposite direction (i.e., in the direction extending towards the smooth end of the lock body). After the lock body 35 separates from the unlocking ring, the unlocking ring remains stationary while the bolt 25 remains on the toothed groove 411. Then, the guard arm body continues to rotate, and the protruding end of the lock body 35 rotates to the bolt 25. The bolt 25 then passes over the lock groove 351 on the protruding end of the lock body 35 and reaches the protruding end. At this time, the lock body return surface 352 of the lock body 35 contacts the connecting limit post connecting the unlocking ring 41 and the limit ring 42, causing the unlocking assembly 4 to rotate until the inner curve segment of the unlocking ring rotates to the bolt. Continuing to rotate, the bolt 25 contacts the protruding end of the lock body 5, and the guard arm body 3 returns to the initial lowered state.

[0077] A further embodiment involves rotating the screw 28 when in the second raised state, causing the movable crossbeam 23 to move, thus reducing or increasing the distance between the rotation center of the latch 25 and the lock body shaft 34, thereby raising or lowering the height of the guard arm body 3 when in the second raised state. For example... Figure 15 , 16The diagrams shown illustrate the lowest and highest positions of the arm guard body in state two. This design accommodates personnel of varying heights, and the same operator can adjust the arm guard height at any time to maintain balance when moving goods at different heights or levels.

[0078] During the rotation from the raised state two to the initial lowered state one or the flipped-up state three, there is a transitional state four (such as...). Figure 14 ).

[0079] Although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0080] Therefore, the above description is only a preferred embodiment of this application and is not intended to limit the scope of this application; that is, all equivalent modifications made in accordance with the scope of the claims of this application shall be within the protection scope of the claims of this application.

Claims

1. An adjustable guard arm for a stand-on electric stacker truck, comprising a base (1) mounted on the truck body, wherein a guard arm body (3) is movably mounted on the base (1), characterized in that: The base (1) is equipped with a latch assembly (2), which includes a rotatably mounted latch (25); the guard arm body (3) includes a lock body assembly (33), which includes a lock body shaft (34) and a lock body (35) fixed on the outer periphery of the lock body shaft (34) and adapted to the latch (25); an unlocking assembly (4) is movably mounted on the lock body shaft (34) located on one side of the lock body (35); after rotating the guard arm body (3), the lock body assembly (33) and the unlocking assembly (4) respectively engage with the latch (25) to adjust the position of the guard arm body (3); the distance between the rotation center of the latch (25) and the lock body shaft (34) is adjusted to adjust the height of the guard arm body in the working state.

2. The adjustable guard arm of a stand-on electric stacker truck according to claim 1, characterized in that: The base (1) includes a base body (11), and a pair of mounting seats (12) are symmetrically fixed on the upper end of the base body (11). A shaft cover (14) is connected above the mounting seats (12). The arm guard body (3) is movably disposed in the mounting cavity limited by the mounting seats (12) and the shaft cover (14).

3. The adjustable guard arm of a stand-on electric stacker truck according to claim 1, characterized in that: The latch assembly (2) also includes a base mounted on the base (1), and the latch (25) is rotatably mounted on the top surface of the base. The base includes an upper crossbeam (21), a movable crossbeam (23), and a lower crossbeam (22) arranged in sequence. A guide shaft (27) is movably passed through the movable crossbeam (23), and the two ends of the guide shaft (27) are fixedly connected to the upper crossbeam (21) and the lower crossbeam (22), respectively. A screw (28) is threadedly connected to the middle of the movable crossbeam (23). The movable end of the screw (28) passes through the upper crossbeam (21) or the lower crossbeam (22) and is located outside the base. Rotating the movable end of the screw (28) causes the movable crossbeam (23) to move between the upper crossbeam (21) and the lower crossbeam (22), thereby changing the distance between the rotation center of the latch (25) and the lock body shaft (34), and thus adjusting the height of the guard arm body in the working state.

4. The adjustable guard arm of a stand-on electric stacker truck according to claim 3, characterized in that: A latch bearing seat (29) is fixedly installed on the outer wall of the movable crossbeam (23). The latch (25) is mounted on the latch bearing seat (29) via a pin (24), so that the latch (25) can rotate around the pin (24). A torsion spring (26) is sleeved on the pin (24) located between the latch (25) and the latch bearing seat (29) for resetting the latch.

5. The adjustable guard arm of a stand-on electric stacker truck according to claim 1, characterized in that: The lock body shaft (34) is fixedly connected to two ends of a symmetrically arranged left guard arm (31) and a right guard arm (32); a left limit block (38) is installed on the left guard arm (31), and a right limit block (39) is installed on the right guard arm (32). The left and right limit blocks are used to limit the axial direction of the guard arm body (3). A left locking block (13) is fixed on the base body (11) located below the side of the arm guard body (3); when the arm guard body (3) is rotated, the arm guard body (3) stops rotating when the left limit block (38) contacts the left locking block (13).

6. The adjustable guard arm of a stand-on electric stacker truck according to claim 1, characterized in that: A retaining ring (45) is fixed on the lock body shaft (34), and the unlocking component (4) is located between the lock body (35) and the retaining ring (45). The unlocking component (4) includes an unlocking ring (41) disposed on one side of the lock body (35). A mounting groove is provided on one side of the lock body (35), and a lock body ball (37) is connected inside the mounting groove by an elastic element. An unlocking ring ball (47) is embedded in one side of the unlocking ring (41). The lock body ball (37) and the unlocking ring ball (47) are arranged opposite to each other. When the lock body (35) is rotated, the lock body ball (37) connects with the unlocking ring ball (47) and drives the unlocking ring (41) to rotate together.

7. The adjustable guard arm of a stand-on electric stacker truck according to claim 6, characterized in that: The unlocking assembly (4) also includes a limiting ring (42), and the unlocking ring (41) and the limiting ring (42) are connected by a connector (46); the connector includes a fixing bolt and a connecting limiting post, wherein one end of the connecting limiting post extends to the outer surface of the unlocking ring (41) and contacts the lock body (35); The unlocking ring (41) has an irregular shape, and its outer circumference is formed by connecting an outer arc segment and an inner curve segment. At the connection between the outer arc segment and the inner curve segment, a tooth groove (411) is formed to engage with the lock tongue (25). The diameter of the outer arc segment is larger than the diameter of the protruding end of the lock body (35), and the diameter of the inner curve segment is smaller than the diameter of the smooth end of the lock body (35). The outer circumferential wall of the limiting ring (42) is fixed with an outwardly protruding first limiting block (421) and a second limiting block (422).

8. The adjustable guard arm of a stand-on electric stacker truck according to claim 6, characterized in that: The unlocking ring (41) has a spherical mounting groove (413) on one side, and the unlocking ring sphere (47) is embedded in the spherical mounting groove (413); the unlocking ring (41) has an unlocking ring shaft hole (412) at the center for fitting onto the lock body shaft (34), and a bearing (43) is installed on the hole wall of the unlocking ring shaft hole (412); a bearing limiting block (44) is fixed on the lock body shaft (34).

9. The adjustable guard arm of a stand-on electric stacker truck according to claim 1, characterized in that: The lock body (35) has a semi-arc structure, and the arc structure on its inner surface matches the lock body shaft (34); The two ends parallel to the lock body shaft (34) are a protruding end and a smooth end. The end face of the smooth end is the lock body return surface (352). The outer surface of the protruding end is provided with a lock groove (351) that engages with the lock tongue (25).

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