A forklift extension fork sleeve is locked by an integrated plug-in lock and a side-fixed type headless inner hexagonal boss set screw

Abstract

The utility model discloses a kind of integral type bolt locking and side fixed type headless inner hexagonal boss set screw locking's forklift extension fork sleeve, belong to forklift accessory technical field, to solve the problem of traditional forklift extension fork sleeve " spare parts is easy to lose " " protrusion interference " " poor length adjustability ".Its characterized in that, including the sleeve body of sleeve in fork front end, sleeve body one end is open end U-shaped groove structure, the other end is closed fork tip end;Two groups of locking mechanism are equipped in sleeve side near open end U-shaped groove structure, respectively first group two side fixed type headless inner hexagonal boss set screw locking mechanism, second group integral type bolt locking mechanism. First group, after assembly, the length can be flexibly adjusted and fixed fork sleeve;Second group, after assembly, limit and prevent from falling by self-weight and protrusion misplacement, without additional clamping spring, nut. Two locking modes cooperate, both reduce spare parts loss and noise, adapt to the safe carrying demand of flexible multi-working condition of warehousing logistics.

Description

Technical Field

[0001] This utility model relates to the field of forklift attachment technology, specifically a forklift extension sleeve that uses two locking methods in combination: an integrated pin locking method and a side-locking headless hexagonal head set screw. Background Technology

[0002] Forklifts are indispensable handling equipment in modern warehousing and logistics. Their standard fork length is limited, and when handling extra-long goods, it is generally necessary to install fork extensions at the fork tips to extend the working range. However, existing extended fork extensions have two major problems:

[0003] Anti-detachment components such as retaining rings or bolted nuts with locking pins are small and easily lost during disassembly and assembly. To prevent the fork sleeve from being pulled out when picking up goods, a pin hole is usually provided on the fork sleeve opening, into which a pin or bolt is inserted. To prevent the pin or bolt from falling off itself, a separate type B retaining ring (i.e., type R retaining ring), cotter pin, or nut matching the bolt is commonly used for locking. These retaining rings or nuts are very easy to lose with frequent disassembly and assembly. Loss during disassembly and assembly affects work efficiency; loss during operation may cause the pin to fall off, causing the fork sleeve to separate from the forks during operation, resulting in a major safety hazard of goods falling or even personal injury.

[0004] Commonly used fork sleeves are not adjustable in length, and some flat-mouth fork sleeves have a nut welded to the side for bolt locking. The protruding nut and bolt head cause interference. Regular fork sleeves are of fixed length. When handling slightly larger loads, operators sometimes risk pulling a section of the sleeve off the forks, but this extended portion is unsecured and easily pulled out by the load, making it extremely unstable and risky. Currently, some flat-mouth fork sleeves have a nut welded to the side for bolt locking. The protruding nut and bolt head affect usability, easily causing scraping and interference when moving pallets or in tight spaces, impacting operational efficiency and user experience. Furthermore, if the internal thread of a single nut fails, the side fixing will completely fail. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a forklift extension sleeve that employs an integrated pin locking mechanism and two side-locking headless hexagonal headstock set screws. The integrated pin locking mechanism eliminates the need for additional loose parts, solving the problem of easily lost anti-disengagement components (spring clips, bolt-matched nuts) in traditional forklift extensions with pins, while also ensuring stable assembly and convenient operation. The two side-locking headless hexagonal headstock set screws not only eliminate the safety hazard of lack of fixation after adjusting the forklift length but also avoid interference from protrusions due to the headless design, thus not affecting operational efficiency and user experience. Furthermore, the double-screw design reduces the risk of complete side fixation failure if a single screw fails. The combined use of these two locking methods also reduces wobbling and noise caused by gap collisions between the forklift extension and the forks, resulting in quieter and more stable handling operations.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a forklift extended fork sleeve, comprising a sleeve body disposed at the front end of the fork, one end of the sleeve body having an open U-shaped groove structure for fitting into the fork, and the other end having a closed fork tip; the side of the sleeve body near the open end is provided with two sets of locking mechanisms, namely a first set of side-fixed headless hexagonal set screw locking mechanism and a second set of integrated pin locking mechanism, the two sets of mechanisms working together to achieve a stable connection between the sleeve body and the fork.

[0007] The first locking mechanism consists of two side-locking headless hexagon socket head cap set screws. The specific structure is as follows: Two spaced threaded holes are located on the side of the sleeve near the U-shaped groove structure at the open end. Each of the two threaded holes is fitted with a headless hexagon socket head cap set screw. The headless hexagon socket head cap set screw precisely matches the threaded hole. After assembly, its head end face is flush with or slightly lower than the outer surface of the sleeve. This not only secures the sleeve after length adjustment by pressing against the side of the fork (the screw boss is to prevent damage to the screw thread structure when pressing against the side of the fork), but also completely avoids protruding structures, achieving interference-free locking, suitable for pallet entry and exit and compact space operation scenarios.

[0008] The second locking mechanism is an integrated pin locking mechanism, located on both sides of the U-shaped groove structure at the open end of the sleeve, and cooperates with the first locking mechanism. The specific structure, assembly process and adaptation principle are as follows: On both sides of the U-shaped groove structure at the open end of the sleeve, there is a coaxially arranged circular stepped pin hole (i.e., pin opening). An L-shaped integrated pin is assembled in both of the two coaxial circular stepped pin holes. This pin is an integrated structure, which does not require additional snap rings, nuts or cotter pins, etc., and completely avoids the problem of easy loss of scattered parts.

[0009] The main body of the L-shaped integrated pin is a solid metal L-shaped pin, formed by perpendicularly bending a transverse section and a longitudinal section (i.e., an L-shaped handle). After assembly, it can maintain a fixed angle of "L-shaped downward" using its own weight. At the end of the transverse section of the L-shaped pin away from the bent end, there are two circular protrusions. The structural parameters of the two protrusions are precisely matched with the circular stepped pin hole: 1. Position and orientation: The first protrusion is located near the other end, and its orientation is completely consistent with the L-shaped bending direction; 2. Spacing and angle: The axial spacing between the second protrusion and the first protrusion is 6-15mm (adjusted according to the wall thickness of the sleeve material), and the two protrusions form a 90° angle along the circumference of the rod; 3. Size matching: The diameter and height of the two protrusions match the channel size of the circular stepped pin hole, meeting the "step-by-step perforation" assembly requirements.

[0010] The assembly steps and anti-disengagement logic of the L-shaped integrated pin and the circular stepped pin hole are as follows: 1. Using the transverse rod segment as a guide, keep the first protrusion and insert it into the circular stepped pin hole on one side of the sleeve until the first protrusion completely passes through the side hole; 2. Rotate the L-shaped longitudinal rod segment (handle) to drive the transverse rod segment to rotate 90° synchronously, so that the second protrusion is aligned with the corresponding matching channel in the hole, and continue to push the pin; 3. Until the transverse rod segment passes through the coaxial circular stepped pin holes on both sides of the sleeve in sequence, and the second protrusion also completely passes through the other side hole, the overall through-hole assembly is completed. At this point, releasing the L-shaped handle causes its own weight to push the pin back to a "downward" angle. The two protrusions and the stepped structure inside the circular stepped pin hole form a misalignment limit, restricting the pin from retracting inward along the hole axis and preventing the pin from rotating and causing the protrusions to realign with the channel. Even with high-frequency vibrations from forklift operation, the "8-10mm spacing, 90° angle" of the double protrusions, combined with the misalignment limit, creates a double barrier, significantly reducing the probability of the pin being pulled out by vibration. For disassembly and assembly, simply lift the L-shaped handle upwards and rotate it 90° simultaneously to align the two protrusions with the corresponding channels inside the hole, then pull the pin out in reverse. There is no damage to any loose parts throughout the process, making the operation highly efficient and convenient.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0012] Solving the core pain point of traditional fork sleeves where "fragmented parts are easily lost": The integrated pin has an integrated anti-detachment structure, eliminating the need for accessories such as snap rings and nuts. There is no loss of parts during the entire assembly and disassembly process. This not only avoids work interruptions caused by lost parts, but also eliminates the safety hazards of "pin falling off and fork sleeves separating from forks due to lost parts", reducing the risk of goods falling and personal injury.

[0013] Overcoming the problem of "no interference between length adjustment and fixation": Double headless internal hexagonal head set screws achieve stable fixation after length adjustment, and there is no protrusion after assembly; it not only meets the handling needs of goods of different lengths (no need to replace fork sleeves), but also adapts to pallet entry and exit and compact space operation, completely solving the problem of protrusion interference of traditional "welded nuts + bolts".

[0014] Enhanced structural reliability and ease of operation: The dual-screw design reduces the risk of individual screw failure; the integrated pin features "double protrusions + self-weight limiting" for shock resistance and anti-loosening; precise matching of threads and pin holes, along with rust-proofing (stainless steel material optional), extends service life; both mechanisms can be disassembled and assembled without special tools (the set screw is operated with a regular Allen wrench and the pin is handled by the handle), and length adjustment is efficient, adapting to the "high-frequency operation, rapid switching" scenario requirements of logistics and warehousing.

[0015] Combining versatility and safety: The sleeve size is compatible with mainstream forks, and the pin and screw structure design takes into account both "fixed strength" and "operational safety". The two sets of mechanisms work together to eliminate swaying and noise, achieving "safe, efficient and quiet" handling operations. It is applicable to various logistics handling scenarios such as regular, extra-long and compact spaces. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included in the protection of this utility model.

[0017] Figure 1 This is a schematic diagram showing the assembly effect of the extended fork extension of this utility model in its normal use state;

[0018] Figure 2 This utility model provides a schematic diagram of the assembly effect of the extended fork sleeve in use.

[0019] Figure 3 This is a three-dimensional exploded view of the extended fork extension for this utility model.

[0020] Figure 4 This is a schematic diagram of the side structure of the extended fork sleeve of the forklift according to this utility model (showing the threaded hole and the circular stepped pin hole).

[0021] Figure 5 This is a schematic diagram of the integrated pin structure for the extended fork sleeve of this utility model for forklift;

[0022] Reference numerals: 1-Sleeve body, 11-Open end U-groove structure, 12-Fork tip, 13-Threaded hole, 14-First circular stepped pin hole, 15-Second circular stepped pin hole; 2-Headless internal hexagonal head set screw; 3-L-shaped integrated pin, 31-Transverse rod segment, 32-Longitudinal rod segment (handle), 33-First protrusion, 34-Second protrusion; 4-Fork. Detailed Implementation

[0023] 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.

[0024] This utility model discloses an extended fork sleeve for a forklift, such as... Figure 1 As shown in Figure 6, the sleeve 1 is made of high-strength manganese steel or stainless steel, and the dimensions of its U-shaped groove structure 11 at the open end are adapted to the cross-sectional dimensions of the standard forklift fork 4.

[0025] During assembly, first align the U-shaped groove structure 11 at the open end of the sleeve 1 with the front end of the fork 4 and insert it. Adjust the length of the sleeve 1 extending beyond the fork 4 according to the length requirements of the goods. Then operate the first locking mechanism: use an Allen wrench to screw the two headless Allen head set screws 2 into the threaded holes 13 on the side of the sleeve 1 in sequence until the screw bosses press against the side of the fork 4. At this time, the screw head is flush with the outer side of the sleeve 1 without any protrusion interference.

[0026] When in normal use without needing to adjust the length, the second locking mechanism can be operated: Align the first protrusion 33 of the L-shaped integrated pin 3 with the transverse rod segment 31 and insert it into the first circular stepped pin hole 14 of the sleeve 1 until the first protrusion 33 is completely through the first circular stepped pin hole 14. Then rotate the longitudinal rod segment 32 (handle) 90° and continue pushing the pin until the second protrusion 34 passes through the first circular stepped pin hole 14. Continue pushing the L-shaped integrated pin 3 until the first protrusion 33 and transverse rod segment 31 are aligned with the second circular stepped pin hole 15 of the sleeve 1 and insert it into the sleeve 1 until the first protrusion 33 is completely through the second circular stepped pin hole 15. Then rotate the longitudinal rod segment 32 (handle) 90° and continue pushing the pin until the second protrusion 34 passes through the second circular stepped pin hole 15. After releasing the handle, the pin self-repositions, completing the anti-disengagement locking.

[0027] During disassembly, rotate the handle of the L-shaped integrated pin 3 90° so that the two protrusions 33 and 34 are aligned with the circular stepped pin holes 14 and 15 in sequence, and the pin can be pulled out in reverse; then use an Allen wrench to loosen the headless Allen head set screw 2 in reverse, and the sleeve 1 can be removed from the fork 4. There is no risk of losing any loose parts throughout the process.

Claims

1. A forklift extension sleeve with integrated pin locking and side-locking headless hexagonal head set screw, characterized in that, Includes a sleeve (1) fitted onto the front end of the fork (4), one end of the sleeve (1) being an open-end U-shaped groove structure (11) and the other end being a closed fork tip (12); the side of the sleeve (1) near the open-end U-shaped groove structure (11) is provided with two sets of cooperating locking mechanisms, namely the first set of two side-fixed headless internal hexagonal boss set screw locking mechanism and the second set of integrated pin locking mechanism.

2. The forklift extended fork sleeve according to claim 1, characterized in that, The first group of two side-fixed headless hexagonal head set screw locking mechanisms includes two threaded holes (13) spaced apart on the side of the sleeve (1). Each threaded hole (13) is fitted with a headless hexagonal head set screw (2). The headless hexagonal head set screw (2) is precisely matched with the threaded hole (13). After assembly, its head end face is flush with or slightly lower than the outer side of the sleeve (1), and the screw boss can abut against the side of the fork (4).

3. The forklift extended fork sleeve according to claim 1, characterized in that, The second set of integrated pin locking mechanisms includes two circular stepped pin holes (14) and (15) arranged coaxially on both sides of the U-shaped groove structure (11) at the open end. An L-shaped integrated pin (3) is assembled in both of the two circular stepped pin holes (14) and (15). The L-shaped integrated pin (3) is a solid metal integrated structure without any additional matching snap rings, nuts or cotter pins.

4. The forklift extended fork sleeve according to claim 3, characterized in that, The L-shaped integrated pin (3) includes a transverse rod segment (31) and a longitudinal rod segment (32) that are bent perpendicularly to each other. The transverse rod segment (31) has two circular protrusions on the other end away from the bent end, which are the first protrusion (33) and the second protrusion (34) along the circumference of the rod body.

5. The forklift extended fork sleeve according to claim 4, characterized in that, The first protrusion (33) is located at the other end of the transverse rod segment (31) away from the bending end, and its orientation is consistent with the bending direction of the L-shaped integrated pin (3); the axial distance between the second protrusion (34) and the first protrusion (33) is 6-20mm, which is greater than the thickness of the material used to make the fork sleeve, and the two form a 90° angle along the circumference of the transverse rod segment (31).

6. The forklift extended fork sleeve according to claim 4, characterized in that, The diameter and height of the first protrusion (33) and the second protrusion (34) are matched with the channel size of the circular stepped pin hole (14) and (15), which meets the requirements of step-by-step perforation assembly; and after assembly, the two protrusions can form a misalignment limit with the inner step structure of the circular stepped pin hole (14).

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