Pull handle extension and retraction control locking device

Abstract

A pull handle extension and retraction control locking device, comprising: a housing (1), a vertical rod (2), a closing member (3), a movable blocking plate (4), a first reset spring (5) and a lock bolt (6), wherein the housing (1) comprises an operating hole (11) provided in the top surface and an inclined sliding surface (12) corresponding to the operating hole (11), and further comprises a limiting protrusion (13) which is connected to the bottom end of the sliding surface (12), the joint of the sliding surface (12) and the limiting protrusion (13) forming an operating slot position (14). When the vertical rod (2) is subjected to a vertically downward acting force and performs vertical displacement downwards, the closing member (3) pushes the movable blocking plate (4) and the lock bolt (6) to perform displacement towards the side away from the limiting protrusion (13) until the bottom end of the vertical rod (2) mates with the operating slot position (14), thus releasing a locked state, whilst compressing the first reset spring (5); when an operating cap is not subjected to a vertically downward acting force, the first reset spring (5) pushes the movable blocking plate (4) and the lock bolt (6) to perform displacement towards the side close to the limiting protrusion (13), and at the same time the closing member (3) pushes the vertical rod (2) to separate from the operating slot position (14) and perform vertical displacement upwards along the sliding surface (12) until the movable blocking plate (4) comes into contact with the limiting protrusion (13), thus restoring to the locked state.

Description

A pull rod telescopic control locking device Technical Field

[0001] The present invention relates to the technical field of travel tools, suitcases and trolley cases, and in particular to a high-reliability trolley telescopic control and locking device. Background Art

[0002] A retractable handle allows for easy adjustment of its length to suit people of different heights or for use in different situations, and is an essential component of a suitcase. The working principle of the suitcase's handle extension and retraction control structure is that when the locking device is pressed, it releases the constraints on the spring mechanism, allowing the spring mechanism to freely extend and retract. When the handle needs to be lengthened or shortened, simply hold the handle and stretch or retract the handle in the desired direction. When the desired length is reached, release the handle, and the locking device will automatically lock the handle in the new position. Accordingly, the handle control locking device requires both simple handle extension and retraction operations and the necessary locking effect to prevent the handle from accidentally extending.

[0003] Under existing technology, the structure of a pull-rod-controlled locking device typically consists of a trigger button, a vertical push rod, a return spring, a sliding plate, and a lock bolt connected to the sliding plate. When the user presses the trigger button, the trigger button moves vertically downward, pushing the vertical push rod downward synchronously. The lower end of the vertical push rod squeezes the sliding plate. Because the sliding plate is placed at an angle in the sliding slot, the vertical downward force of the vertical push rod is decomposed on the inclined sliding plate to produce a horizontal movement component, causing the sliding plate to move horizontally within the sliding slot and compress the return spring, while simultaneously driving the lock bolt to move out of the keyhole and unlock the state. At this point, the pull-rod limit is released, allowing the extension and retraction operation to proceed. When the user stops pressing the trigger button, the return spring pushes the sliding plate to move horizontally in the opposite direction, thereby driving the lock bolt into the keyhole to resume the locked state. At the same time, the sliding plate pushes the vertical push rod to move upward and reset.

[0004] However, the drawbar control locking device of the prior art still has many problems during use: there is a problem of contact position misalignment between the vertical push rod and the sliding piece, especially when the drawbar has been used for a longer time, the vertical push rod and the sliding piece are easily misaligned due to wear and deformation of the components, making it impossible for the vertical push rod to push the sliding piece normally; the matching durability of the sliding piece and the sliding groove is poor, especially in the use scenario of the drawbar case which may involve rain and dust, causing the sliding piece to be blocked in the sliding groove, affecting the normal operation of the drawbar control locking device, and even causing the drawbar to be unable to be extended or unable to be retracted after being extended, making the drawbar case unable to continue to be used.

[0005] Summary of the Invention

[0006] In order to address the shortcomings of the existing technology, the present invention proposes a highly reliable pull rod telescopic control locking device, which can easily adjust the matching length between the lock bolt and the lock hole, and the control length and control depth are adjustable. The overall structure is compact and has good sealing performance. It can effectively reduce the impact of rain and dust, and help extend the service life of the pull rod case.

[0007] To achieve the above objectives, the present invention includes:

[0008] A high-reliability pull rod telescopic control locking device, characterized by comprising a housing, a vertical rod, a closing member, a first return spring and a locking bolt;

[0009] The shell includes a top surface, a left end surface, a right end surface, a movable baffle, a sliding surface and a limiting protrusion that are integrally formed and connected. The left end surface and the right end surface are respectively fixedly contacted and connected to the inner wall of the accommodating cavity so that the main body of the shell is fixed relative to the accommodating cavity. The top surface is provided with an operating hole. The sliding surface is an inclined surface corresponding to the operating hole. The bottom end of the sliding surface is connected to the limiting protrusion. One end of the limiting protrusion is non-fixedly contacted with the movable baffle, and the other end is fixedly contacted and connected to the inner wall of the accommodating cavity so that the limiting protrusion and the sliding surface are fixed relative to the accommodating cavity. The connection part between the sliding surface and the limiting protrusion constitutes an operating slot. The size of the operating hole matches the vertical rod.

[0010] The vertical rod passes vertically through the operation hole and performs vertical displacement relative to the shell. The top of the vertical rod is fixed with an operation cap, and the bottom end matches the operation slot. When the bottom end of the vertical rod matches and contacts the operation slot, the operation cap does not contact the top of the shell.

[0011] One end of the closing member is rotatably connected to the bottom end of the vertical rod, and the other end is rotatably connected to the movable baffle;

[0012] The movable baffle performs a swing displacement relative to the main body of the housing with the connection position as an axis;

[0013] One end of the first return spring is connected to the movable baffle, and the other end is connected to the inner wall of the accommodating cavity;

[0014] The locking bolt is fixedly connected to the movable baffle and performs horizontal displacement relative to the housing synchronously with the swing of the movable baffle;

[0015] When the operating cap is subjected to a vertical downward force causing the vertical rod to move downward, the closing member pushes the movable baffle and the locking bolt to move away from the limiting protrusion until the bottom end of the vertical rod matches and contacts the operating slot, while compressing the first return spring;

[0016] When the operating cap is not subjected to a vertical downward force, the first return spring pushes the movable baffle and the lock bolt to move toward the side close to the limiting protrusion, and at the same time the closing member pushes the vertical rod out of the operating slot and moves vertically upward until the movable baffle contacts the limiting protrusion.

[0017] Furthermore, it further comprises a second return spring, one end of the second return spring being connected to the operating cap and the other end being connected to the housing;

[0018] When the operating cap is subjected to a vertical downward force causing the upright to move vertically downward, the second return spring is compressed;

[0019] When the operating cap is not subjected to a vertical downward force, the second return spring compresses and pushes the operating cap to perform a vertical displacement upward.

[0020] Furthermore, the left end surface and the right end surface are respectively provided with fixing holes, and the left end surface and the right end surface are respectively fixedly contacted and connected to the inner wall of the accommodating cavity through the fixing holes.

[0021] The present invention also relates to a telescopic pull rod, characterized in that the telescopic pull rod comprises the pull rod telescopic control locking device as described above.

[0022] The present invention also relates to a trolley case, characterized in that the trolley case comprises the trolley rod telescopic control locking device as described above, or uses the telescopic trolley rod as described above.

[0023] The beneficial effects of the present invention are:

[0024] By adopting the high-reliability pull rod telescopic control locking device described in the present invention, the matching length between the lock bolt and the lock hole can be easily adjusted, and the control length and control depth can be adjusted, thereby upgrading the inaccurate and random control method of the pull rod control locking in the existing technology to a precise and reliable control method; the overall structure is compact and has good sealing performance, which can effectively reduce the impact of rain and dust, help to extend the service life of the pull rod case, and is particularly suitable for upgrading various existing telescopic pull rods. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] FIG1 is a schematic diagram of the prior art.

[0026] FIG2 is a schematic diagram of a locking state of a preferred embodiment of a pull rod telescopic control locking device according to the present invention.

[0027] FIG3 is a schematic diagram of the unlocked state of the preferred embodiment of the pull rod telescopic control locking device of the present invention.

[0028] Explanation of the accompanying figures: 1-shell, 11-operating hole, 12-sliding surface, 13-limiting protrusion, 14-operating slot, 2-vertical pole, 21-operating cap, 3-closing member, 4-movable baffle, 5-first return spring, 6-lock bolt, 7-second return spring, 81-trigger button, 82-vertical push rod, 83-third return spring, 84-sliding sheet, 85-sliding slot. DETAILED DESCRIPTION

[0029] In order to more clearly understand the content of the present invention, it will be described in detail with reference to the accompanying drawings and embodiments.

[0030] FIG1 is a schematic diagram of a typical structure of a pull rod controlled locking device in the prior art, comprising a trigger button 81, a vertical push rod 82, a third return spring 83, a sliding plate 84 (installed in a matching sliding groove 85), and a locking bolt 6 connected to the sliding plate 84. During use, by pressing the trigger button 81, the vertical push rod 82 is pushed downward vertically, releasing the inclined sliding plate 84, thereby generating a horizontal movement component, causing the sliding plate 84 and the locking bolt 6 to synchronously perform horizontal displacement to release the locked state, while compressing the third return spring 83. When the trigger button 81 is no longer pressed, the third return spring 83 is released and pushes the sliding plate 84 and the locking bolt 6 to synchronously perform horizontal displacement in the opposite direction to restore the locked state. At the same time, the inclined surface of the sliding plate 84 pushes the vertical push rod 82 to perform upward vertical displacement. During the operation of the prior art, the sliding plate 84 needs to be limited to one degree of freedom of movement (horizontal movement), but it will be simultaneously subjected to forces in two different directions: the vertical direction of the vertical push rod 82 and the horizontal direction of the third return spring 83, which makes the sliding plate 84 easy to wear, resulting in failure of matching with the sliding groove 85, thereby affecting the normal operation of the locking device.

[0031] As shown in Figures 2 and 3, a preferred embodiment of the pull rod telescopic control and locking device of the present invention comprises a housing 1, a vertical rod 2, a closing member 3, a movable baffle 4, a first return spring 5, and a locking bolt 6, and preferably also a second return spring 7. The housing 1 includes an operating hole 11 on its top surface and an inclined sliding surface 12 corresponding to the operating hole 11. It also includes a retaining protrusion 13 connected to the bottom end of the sliding surface 12. The connection between the sliding surface 12 and the retaining protrusion 13 forms an operating slot 14. The housing 1 also includes left and right end surfaces, wherein the left and right end surfaces are respectively fixedly connected to the inner wall of the accommodating chamber to fix the main body of the housing 1 relative to the accommodating chamber. Furthermore, one end of the retaining protrusion 13 is fixedly connected to the inner wall of the accommodating chamber to fix the retaining protrusion 13 and the sliding surface 12 relative to the accommodating chamber. In particular, the other end of the retaining protrusion 13 is non-fixedly in contact with the movable baffle 4, providing a predetermined retaining effect on the movable baffle 4 without additional force. An operating cap 21 is fixedly provided at the top of the vertical rod 2, and vertically passes through the operating hole 11 and performs vertical displacement relative to the shell 1. The vertical displacement is based on the bottom end of the vertical rod 2 matching and contacting the operating slot 14 as the lower limit of the displacement. At this time, the operating cap 21 does not contact the top of the shell 1. The vertical rod 2 and the movable baffle 4 are connected by a closing member 3. The closing member 3 can rotate freely relative to the vertical rod 2 and the movable baffle 4, for example, by a rotating shaft or a rotatable pipe. The movable baffle 4 performs a swinging displacement relative to the shell 1 with the main connection position of the shell 1 as the axis, that is, the freedom of movement of the movable baffle 4 is limited. The locking bolt 6 is fixedly connected to the movable baffle 4 and performs horizontal displacement relative to the shell 1 synchronously with the movable baffle 4. One end of the first return spring 5 is connected to the movable baffle 4, and the other end is connected to the shell 1. Preferably, one end of the second return spring 7 is connected to the operating cap 21, and the other end is connected to the shell 1.

[0032] In the default locked state (as shown in FIG2 ), the operating cap 21 is not subject to vertical downward force, and the movable baffle 4, pushed by the first return spring 5, contacts the limiting protrusion 13. Simultaneously, the upright 2 is in a relatively high first operating position. At this point, the bottom end of the upright 2 is disengaged from the operating slot 14, and the angle between the closure member 3 and the upright 2 is large, causing the movable baffle 4 to be closer to the upright 2 horizontally. The movable baffle 4 and the locking bolt 6 move horizontally, allowing the locking bolt 6 to enter the matching lock hole, maintaining the locked state.

[0033] When the operating cap 21 is subjected to a vertical downward force causing the upright 2 to perform a vertical downward displacement, the closing member 3 pushes the movable baffle 4 and the locking bolt 6 to displace away from the limiting protrusion 13 until the bottom end of the upright 2 matches and contacts the operating slot 14, placing the upright 2 in a relatively low second working position and compressing the first return spring 5. At this time, the angle between the closing member 3 and the upright 2 is small, causing the movable baffle 4 to be farther horizontally from the upright 2. The movable baffle 4 and the locking bolt 6 are displaced in the opposite direction, allowing the locking bolt 6 to disengage from the matching lock hole and release the lock state (as shown in Figure 3), allowing the pull rod to freely extend and retract. Preferably, during the process of the upright 2 moving from the first working position to the second working position, the operating cap 21 compresses the second return spring 7.

[0034] When the pull rod is adjusted to a suitable position and the locked state needs to be restored, the vertical downward force applied to the operating cap 21 is stopped, and the first return spring 5 is released to push the movable baffle 4 and the lock bolt 6 to move toward the side close to the limiting protrusion 13 until the movable baffle 4 contacts the limiting protrusion 13, allowing the lock bolt 6 to re-enter the matching lock hole and restore the locked state (as shown in Figure 1). During this process, the closing member 3 pushes the vertical rod 2 out of the operating slot 14 and moves vertically upward along the sliding surface 12. The angle between the closing member 3 and the vertical rod 2 gradually increases until the vertical rod 2 reaches the first working position. Preferably, during the process of the vertical rod 2 moving from the second working position to the first working position, the second return spring 7 is released to push the operating cap 21 to move upward.

[0035] During operation using the above-mentioned preferred embodiment, the vertical force generated by the displacement of the upright 2 is converted into a horizontal force by the closing member 3 to act on the movable baffle 4, ensuring that the movable baffle 4 is only subjected to horizontal force during operation, simplifying the force condition of the movable baffle 4, thereby improving the operational stability of the locking device.

[0036] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention are intended to be covered by the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A pull rod telescopic control locking device, characterized in that: It includes a housing, a vertical rod, a closing member, a first return spring and a locking bolt; The shell comprises a top surface, a left end surface, a right end surface, a movable baffle, a sliding surface and a limiting protrusion which are integrally formed and connected, the left end surface and the right end surface are respectively fixedly contacted and connected to the inner wall of the accommodating cavity so that the main body of the shell is fixed relative to the accommodating cavity, the top surface is provided with an operating hole, the sliding surface is an inclined surface corresponding to the operating hole, the bottom end of the sliding surface is connected to the limiting protrusion, one end of the limiting protrusion is non-fixedly contacted with the movable baffle, and the other end is fixedly contacted and connected to the inner wall of the accommodating cavity so that the limiting protrusion and the sliding surface are fixed relative to the accommodating cavity, the connecting part of the sliding surface and the limiting protrusion constitutes an operating slot, and the size of the operating hole matches the vertical rod; The vertical rod vertically passes through the operating hole and performs vertical displacement relative to the shell, an operating cap is fixedly arranged on the top of the vertical rod, and the bottom end matches the operating slot, and when the bottom end of the vertical rod matches and contacts the operating slot, the operating cap does not contact the top of the shell; One end of the closing member is rotatably connected to the bottom end of the vertical rod, and the other end is rotatably connected to the movable baffle; The movable baffle performs a swing displacement relative to the main body of the housing with the connection position as an axis; One end of the first return spring is connected to the movable baffle, and the other end is connected to the inner wall of the accommodating cavity; The locking bolt is fixedly connected to the movable baffle and synchronously performs horizontal displacement relative to the housing as the movable baffle swings; When the operating cap is subjected to a vertical downward force causing the vertical rod to move downward vertically, the closing member pushes the movable baffle and the locking bolt to move away from the limiting protrusion until the bottom end of the vertical rod matches and contacts the operating slot, while compressing the first return spring; When the operating cap is not subjected to a vertical downward force, the first return spring pushes the movable baffle and the locking bolt to move toward the side close to the limiting protrusion, and at the same time the closing member pushes the vertical rod out of the operating slot and moves vertically upward until the movable baffle contacts the limiting protrusion.

2. The pull rod telescopic control locking device according to claim 1, characterized in that: It also includes a second return spring, one end of which is connected to the operating cap, and the other end of which is connected to the housing; When the operating cap is subjected to a vertical downward force to cause the vertical rod to move downward vertically, the first Second, the return spring is compressed; When the operating cap is not subjected to a vertical downward force, the second return spring is compressed to push the operating cap to perform a vertical displacement upward.

3. The pull rod telescopic control locking device according to claim 1, characterized in that: The left end surface and the right end surface are respectively provided with fixing holes, and the left end surface and the right end surface are respectively fixedly contacted and connected to the inner wall of the accommodating cavity through the fixing holes.

4. A retractable pull rod, characterized in that: The telescopic pull rod includes a pull rod telescopic control locking device as claimed in claim 1 or 3.

5. A trolley case, characterized in that: The trolley case includes the trolley extension control locking device according to claim 1 or 3, or includes the retractable trolley according to claim 4.

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