Rigidly lockable end stop
By designing a locking and unlocking function for the locking spring driven by the locking and unlocking adjustment roller, the problem of insufficient support force of the limit switch at its maximum length is solved, achieving stable support and cost reduction.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SUSPA (NANJING) CO LTD
- Filing Date
- 2025-07-14
- Publication Date
- 2026-07-07
AI Technical Summary
Existing limit switches cannot provide stable rigid locking when the strut is stretched to its maximum length, resulting in insufficient support and inability to effectively resist strong winds or sudden overpressure.
A rigidly lockable limit switch was designed. By driving the locking spring to retract or retract through the concave and convex inner surface of the locking and releasing adjustment roller, the hook and cylinder can overlap or disengage, providing locking or unlocking functions. This simplifies the structure and reduces manufacturing costs.
It achieves stable support at the maximum tension of the strut, simplifies the manufacturing process, reduces product complexity and manufacturing costs, and improves the stability and safety of the support force.
Smart Images
Figure CN224468970U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a limitless positioner, specifically a limitless positioner that can be rigidly locked. Background Technology
[0002] Limit switches or stop dampers at any position, as a type of strut, can provide support for car door hoods. In many situations, when the car door is fully open, i.e., when the strut is stretched to its maximum length, users often need stronger support to withstand strong winds or sudden overpressure situations, preventing potential unnecessary injury.
[0003] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art. Utility Model Content
[0004] Purpose of the utility model: The technical problem to be solved by this utility model is to provide a rigidly lockable limit switch that can rigidly lock when the support rod is stretched to its maximum length, thereby providing stable support force.
[0005] To solve the above-mentioned technical problems, this utility model discloses a rigidly lockable limit switch, which includes:
[0006] Cylinder;
[0007] An outer sleeve, the rear end of which is movably fitted onto the outside of the cylinder along its axial direction; a locking spring is formed on the outer sleeve that is inclined outward and can be retracted inward along the radial direction of the outer sleeve, and an inward hook is formed on the locking spring;
[0008] And a locking and releasing adjusting roller, which is at least partially rotatably sleeved on the outer sleeve about the axis of the outer sleeve and engages with the outer sleeve in an axial upper limit; the locking and releasing adjusting roller has a concave and convex inner surface that abuts against the locking spring;
[0009] The rotation of the inner surface of the locking and adjusting roller drives the locking spring to retract inward or return outward, so that in the axial projection view along the outer sleeve, the projection area of the hook overlaps with the projection area of the cylinder or is located outside the projection area of the cylinder.
[0010] Specifically, the inner side of the locking and adjusting roller is provided with an avoidance groove and a locking surface. The avoidance groove is recessed and has an inclined side surface. The inclined side surface connects to the locking surface. The inclined side surface and the locking surface together form the concave and convex inner surface.
[0011] Specifically, when the clearance groove of the locking adjustment roller rotates to the locking spring, the locking spring is at least partially located within the clearance groove, and in the axial projection view along the outer sleeve, the projection of the hook is located outside the projection of the front end face of the cylinder.
[0012] When the locking surface of the locking adjustment roller rotates towards the locking spring, the locking spring retracts inward under the drive of the inclined side of the locking adjustment roller. After it reaches its position, it abuts against the locking surface. In the axial projection view along the outer sleeve, the projection of the hook overlaps with the projection of the front end face of the cylinder.
[0013] Beneficial effects:
[0014] 1. This utility model utilizes a rotating locking and releasing adjusting roller. The inner surface of the roller, with its concave and convex surfaces, presses against the locking spring against the inner side of the outer sleeve, causing the hook to extend into the inner side of the outer sleeve. This causes the projected area of the hook to overlap with the projected area of the cylinder, and the hook abuts against the cylinder along the axial direction of the outer sleeve, achieving locking. Reverse rotation causes the locking spring to slide into the locking and releasing adjusting roller, placing the projected area of the hook outside the projected area of the cylinder, disengaging the hook from the cylinder, thus unlocking and allowing the piston rod to be compressed. This stabilizes the limit switch in its maximum tension state, achieving rigid locking and providing stable support.
[0015] 2. The locking and adjusting roller of this utility model is sleeved on the outside of the outer sleeve. Its length only needs to cover the locking spring, the rotation limit spring, etc., so it does not need to be made very long, thus saving materials.
[0016] 3. This utility model allows the outer sleeve to be directly fixed to the extended end of the piston rod. Because the outer sleeve does not need to rotate relative to the piston rod, there is no need to add a rotational transition component between the two, thereby simplifying the manufacturing process and saving manufacturing costs.
[0017] 4. The spring clip structure of the outer sleeve does not require limiting its position relative to the circumference of the cylinder. When locking, it can be directly hooked onto the end face of the inner cylinder to limit the position. In contrast, in the existing related technologies, a radially protruding structure needs to be added to the end of the cylinder, and the cylinder can only be locked after rotating a certain angle. Therefore, compared with the existing technology, this application significantly reduces the complexity of the product, thereby reducing the product manufacturing cost. Attached Figure Description
[0018] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, and the advantages of the present invention in the above and / or other aspects will become clearer.
[0019] Figure 1 The first embodiment of this utility model shows the rigidly lockable limitless positioner in its maximum tension position and in the unlocked state as shown in the main sectional view.
[0020] Figure 2 For Figure 1 A cross-sectional view of line AA in the diagram;
[0021] Figure 3 For Figure 1 A cross-sectional view of the BB line in the diagram;
[0022] Figure 4 The first embodiment of this utility model shows the rigidly lockable limitless positioner in its maximum tension position and in the unlocked state as shown in the main sectional view.
[0023] Figure 5 For Figure 4 A cross-sectional view of the CC line in the diagram;
[0024] Figure 6 For Figure 4 A cross-sectional view of the DD line in the diagram;
[0025] Figure 7 for Figure 1 A three-dimensional structural diagram of the outer sleeve in the limit switch shown;
[0026] Figure 8 for Figure 7 The three-dimensional sectional view of the outer sleeve shown;
[0027] Figure 9 for Figure 1 A three-dimensional structural diagram of the locking and releasing adjusting roller in the limit switch shown;
[0028] Figure 10 For Figure 9 A cross-sectional view of the EE line in the diagram;
[0029] Figure 11 For Figure 9 A cross-sectional view of the FF line in the diagram;
[0030] Figure 12 This is a schematic diagram of the structure of the locking and adjusting roller and the outer sleeve in the upper limit of the axial direction, which is provided for the first embodiment of this utility model.
[0031] The accompanying labeling is as follows:
[0032] 100. Cylinder; 200. Piston rod; 210. Piston end; 220. Extended end; 300. Outer sleeve; 310. Locking spring; 311. Guide slope; 320. Hook; 330. Positioning step; 340. Elastic buckle; 400. Locking adjustment roller; 411. Avoidance groove; 412. Inclined side; 412. Locking surface; 420. First stepped groove; 430. Annular positioning groove; 440. Second stepped groove; 510. Rotation limit spring; 520. Limiting slide groove; 530. Protruding structure. Detailed Implementation
[0033] Example 1
[0034] When the car door is fully open, that is, when the strut is stretched to its maximum length, users often need stronger support to withstand strong winds or sudden overpressure situations and prevent possible unnecessary injuries.
[0035] Therefore, embodiments of this utility model disclose a rigidly lockable limit switch, which includes a cylinder 100, a piston rod 200, an outer sleeve 300, and a locking and releasing adjusting roller 400.
[0036] Combination Figure 1 As shown, the piston rod 200 includes a piston end 210 and an extension end 220. The piston end 210 is disposed inside the cylinder 100 and slides with the cylinder 100, while the extension end 220 extends out of the cylinder 100 from the front end of the cylinder 100.
[0037] Combination Figure 1 As shown, the outer sleeve 300 is fixedly sleeved on the outside of the extended end 220 of the piston rod 200 and extends to the outside of the front end of the cylinder 100, so as to receive the cylinder 100 when the piston rod 200 moves axially toward the cylinder 100. A locking spring 310 is formed on the outer sleeve 300, which is inclined outward and can be retracted radially inward along the outer sleeve 300. An inward hook portion 320 is formed on the locking spring 310.
[0038] Combination Figure 1 As shown, the locking and adjusting roller 400 is at least partially rotatably fitted onto the outer sleeve 300 about its axis and is in axial upper limit engagement with the outer sleeve 300. Figure 1 , Figure 2 and Figure 9 As shown, the locking adjustment roller 400 has a concave-convex inner surface that abuts against the locking spring 310.
[0039] Combination Figure 4 , Figure 5 and Figure 6As shown, the inner surface of the locking and adjusting roller 400 rotates, driving the locking spring 310 to retract inward or return outward, so that in the axial projection view along the outer sleeve 300, the projection area of the hook 320 overlaps with the projection area of the cylinder 100 or is located outside the projection area of the cylinder 100.
[0040] Specifically, when the locking spring 310 retracts inward and the projected area of the hook 320 overlaps with the projected area of the cylinder 100, there is usually a gap of several millimeters between the end of the cylinder 100 and the hook 320. When compressed by external force, this gap is eliminated, and the hook 320 abuts against and hooks the cylinder 100 along the axial direction of the outer sleeve 300, thereby preventing the piston rod 200 from being further compressed and stabilizing the piston rod 200 at its maximum extension position. At this time, the limit switch is in the locked state.
[0041] When the projection area of the hook 320 is outside the projection area of the cylinder 100, the hook 320 has retracted outward from the outer sleeve 300 and disengaged from the cylinder 100. If an external force is applied to the outer sleeve 300 or the piston rod 200 toward the cylinder 100, the piston end 210 of the piston rod 200 will move along the cylinder 100. At this time, the limit switch is in the unlocked state.
[0042] Specifically, in combination Figure 2 and Figure 9 As shown, the inner side of the locking and adjusting roller 400 is provided with a relief groove 411 and a locking surface 412. The relief groove 411 is recessed and has an inclined side surface 413, which connects to the locking surface 412. The inclined side surface 413 and the locking surface 412 together constitute the aforementioned concave and convex inner surface. In this embodiment, in order to simplify the structure, combined with Figure 2 and Figure 9 As shown, the locking surface 412 of the locking and adjusting roller 400 is the cylindrical inner wall surface of the locking and adjusting roller 400.
[0043] It should be understood that an obtuse angle is formed between the inclined side 413 and the bottom surface of the relief groove 411 to facilitate the locking spring 310 moving out of the relief groove 411 under the drive of the inclined side 413.
[0044] When the locking surface 412 of the locking and releasing adjusting roller 400 rotates toward the locking spring 310, the locking spring 310 retracts inward under the drive of the inclined side 413 of the locking and releasing adjusting roller 400; after it is in place, it abuts against the locking surface 412, and in the axial projection view along the outer sleeve 300, the projection of the hook 320 overlaps with the projection of the front end face of the cylinder 100.
[0045] When the clearance groove 411 of the locking adjusting roller 400 rotates to the locking spring 310, the locking spring 310 is at least partially located within the clearance groove 411, and in the axial projection view along the outer sleeve 300, the projection of the hook 320 is located outside the projection of the front end face of the cylinder 100, see [reference]. Figure 2 .
[0046] Combination Figure 2 As shown, the cross-section of the locking spring 310 corresponds to the cross-section of the clearance groove 411. In other words, the locking spring 310 correspondingly has a guide ramp 311. When the locking spring 310 is located within the clearance groove 411, the guide ramp 311 abuts against the inclined side surface 413 of the clearance groove 411. Specifically, the inclined side surface 413 can be an inclined plane or an inclined arc surface. See also Figure 2 and Figure 10 As shown, Figure 2 The inclined side 413 of the clearance groove 411 is an inclined plane.
[0047] In some embodiments, combined with Figure 1 As shown, the end of the locking spring 310 is bent inward to form a hook 320.
[0048] In some embodiments, combined with Figure 4 As shown, the hook 320 extends into the inner side of the outer sleeve 300 and abuts against the front end face of the cylinder 100 along the axial direction of the outer sleeve 300.
[0049] To facilitate operation and prevent excessive rotation of the locking / releasing adjusting roller 400, ensuring precise switching between the unlocked and locked states of the limitless positioner, a rotation limit structure is provided between the locking / releasing adjusting roller 400 and the outer sleeve 300 to restrict the rotational range of the locking / releasing adjusting roller 400. Combined with... Figure 3 , Figure 6 , Figure 7 and Figure 9 As shown, the rotation limiting structure includes a rotation limiting spring 510 and a limiting slide groove 520. The rotation limiting spring 510 is disposed on either the locking adjusting roller 400 or the outer sleeve 300, and the limiting slide groove 520 is disposed on the other of the locking adjusting roller 400 and the outer sleeve 300. The locking adjusting roller 400 rotates, causing the rotation limiting spring 510 to slide within the limiting slide groove 520. Figure 3 As shown, when the rotating limiting spring 510 is located at the first end of the limiting slide groove 520, the locking and releasing adjusting roller 400 is in the locked position. At this time, the projection area of the hook 320 overlaps with the projection area of the cylinder 100. Figure 5 As shown, when the rotating limit spring 510 is located at the second end of the limit slide groove 520, the locking and releasing adjusting roller 400 is in the unlocked position. At this time, the projection area of the hook 320 is located outside the projection area of the cylinder 100.
[0050] Preferably, combined with Figure 4 As shown, along the axial direction of the outer sleeve, the locking spring 310 is closer to the rear end of the outer sleeve 300 than the rotation limiting spring 510.
[0051] To stabilize the locking adjustment roller 400 in the locked position, such as Figure 6 and Figure 11 As shown, the bottom of the limiting slide groove 520 is provided with a protruding structure 530. When the locking and releasing adjusting roller 400 is in the locked position, the rotating limiting spring 510 is located between the protruding structure 530 and the first end of the limiting slide groove 520. When a certain external force is applied to the locking and releasing adjusting roller 400 in the locked position, the rotating limiting spring 510 can slide past the protruding structure 530 to the second end of the limiting slide groove 520, causing the locking and releasing adjusting roller 400 to rotate from the locked position to the unlocked position. Optionally, combined with Figure 6 As shown, the cross-section of the protruding structure 530 is in the shape of a protrusion.
[0052] To provide sufficient locking rigidity, combined with Figure 7 and Figure 9 As shown, there are two or more locking springs 310 and rotation limiting springs 510, which are respectively arranged in a circumferential arrangement around the outer sleeve 300 at intervals. The number of locking springs 310 can be the same as or more than the number of rotation limiting springs 510. In a specific embodiment, as... Figure 7 As shown, the rotation limit spring 510 is mounted on the outer sleeve 300. Figure 9 As shown, the limiting groove 520 is provided on the inner surface of the locking and releasing adjusting roller 400. The locking and releasing adjusting roller 400 rotates, causing the rotation limiting spring 510 to slide within the limiting groove 520. Figure 7 and Figure 9 As shown, there are six locking springs 310 and six rotation limiting springs 510, which are evenly spaced and arranged in a ring around the circumference of the outer sleeve 300. Along the axial direction of the outer sleeve, the locking springs 310 and the rotation limiting springs 510 are arranged in a one-to-one correspondence. The limiting groove 520 may or may not be connected to the clearance groove 411.
[0053] Combination Figure 8As shown, the end of the locking spring 310 extends towards the front end of the outer sleeve 300 along the axial direction of the outer sleeve. When the outer sleeve 300 applies a force towards the rear end of the cylinder 100 through the hook 320, the reaction force applied by the cylinder 100 to the hook 320 generates a tensile force on the locking spring 310 along the axial direction towards the front end of the outer sleeve 300. Compared to the end of the locking spring 310 extending towards the rear end of the outer sleeve 300 along the axial direction of the outer sleeve, this avoids the locking spring 310 from folding and deforming, thereby ensuring that the hook 320 can stably hook the cylinder 100.
[0054] Combination Figure 7 As shown, the extension direction of the end of the rotation limiting spring 510 is consistent with the extension direction of the end of the locking spring 310.
[0055] Combination Figure 7 As shown, the elastic buckle 340 extends from the outer sleeve 300 along the axis of the outer sleeve towards the rear end of the outer sleeve 300.
[0056] In order to ensure that the locking and adjusting roller 400, which is at least partially rotatable relative to the outer sleeve 300, is in axial upper limit engagement with the outer sleeve 300, the following is combined: Figure 10 As shown, a positioning step 330 is provided on the outer wall of the outer sleeve 300, and a first stepped groove 420 is provided on the inner wall of the front end of the locking and adjusting roller 400. The positioning step 330 is in contact with the bottom of the first stepped groove 420. Figure 7 As shown, the outer sleeve 300 is provided with an outwardly inclined elastic buckle 340 that can retract radially inward along the outer sleeve 300. The elastic buckle 340 is circumferentially offset from the rotation limiting spring 510 and the locking spring 310. Figure 10 As shown, the inner side of the locking and adjusting roller 400 has an annular positioning groove 430 for accommodating the elastic buckle 340, and the elastic buckle 340 is slidably disposed within the annular positioning groove 430. This achieves axial limiting engagement between the locking and adjusting roller 400 and the outer sleeve 300. During installation, the locking and adjusting roller 400 can be moved forward from the rear end side of the outer sleeve 300 and fitted onto the outer sleeve 300.
[0057] Combination Figure 7 As shown, along the axial direction of the outer sleeve, the elastic buckle 340 can be closer to the rear end of the outer sleeve 300 than the locking spring 310.
[0058] It should be understood that, in some other embodiments, the locking and adjusting roller 400 may also move from the front end of the outer sleeve 300 toward the direction closer to the outer sleeve until it is fitted onto the outer sleeve 300. Specifically, along the axial direction of the outer sleeve, an elastic buckle 340, a rotation limiting spring 510, a locking spring 310, and a positioning step 330 are sequentially provided on the outer sleeve from the front end to the far end, wherein the elastic buckle 340 extends from the cylinder of the outer sleeve 300 along the axial direction of the outer sleeve toward the front end of the outer sleeve 300.
[0059] In this embodiment, see Figure 1 and Figure 9 The inner wall of the rear end of the locking and adjusting roller 400 may also be provided with a second stepped groove 440 for accommodating the dustproof seal 600.
[0060] Example 2
[0061] Unlike the outer sleeve 300 in Embodiment 1, in this embodiment, the front end of the outer sleeve 300 is rotatably connected to the extended end 220 of the piston rod 200 via a bearing, which is not shown in the figure.
[0062] When locking or unlocking, hold the outer sleeve 300 and the locking / unlocking adjusting roller 400 with both hands respectively, so that the two rotate relative to each other.
[0063] This utility model provides a concept and method for a rigidly lockable limit switch. Many methods and approaches exist for implementing this technical solution; the above description is merely a preferred embodiment. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. All components not explicitly stated in this embodiment can be implemented using existing technology.
Claims
1. A rigidly lockable limitless positioner, characterized in that, include: Cylinder (100); An outer sleeve (300) is movably fitted onto the outer side of the cylinder (100) along its axial direction at its rear end; a locking spring (310) is formed on the outer sleeve (300) that is inclined outward and can be retracted radially inward along the outer sleeve (300); an inward hook (320) is formed on the locking spring (310). And a locking adjustment roller (400), which is rotatably sleeved on the outer sleeve (300) at least partially about the axis of the outer sleeve (300); the locking adjustment roller (400) has a concave and convex inner surface that abuts against the locking spring (310); The inner surface of the locking adjustment roller (400) rotates to drive the locking spring (310) to retract inward or return outward, so that in the axial projection view along the outer sleeve (300), the projection area of the hook (320) overlaps with the projection area of the cylinder (100) or is located outside the projection area of the cylinder (100).
2. The rigidly lockable limitless positioner according to claim 1, characterized in that, The inner side of the locking and adjusting roller (400) is provided with a relief groove (411) and a locking surface (412). The relief groove (411) is recessed and has an inclined side surface (413). The inclined side surface (413) connects to the locking surface (412). The inclined side surface (413) and the locking surface (412) together constitute the concave and convex inner surface.
3. The rigidly lockable limitless positioner according to claim 2, characterized in that, When the clearance groove (411) of the locking adjustment roller (400) rotates to the locking spring (310), the locking spring (310) is at least partially located in the clearance groove (411), and in the axial projection view along the outer sleeve (300), the projection of the hook (320) is located outside the projection of the front end face of the cylinder (100); When the locking surface (412) of the locking adjustment roller (400) rotates toward the locking spring (310), the locking spring (310) is driven by the inclined side (413) of the locking adjustment roller (400) to retract inward. After it is in place, it abuts against the locking surface (412). In the axial projection view along the outer sleeve (300), the projection of the hook (320) overlaps with the projection of the front end face of the cylinder (100). The cross-section of the locking spring (310) and the cross-section of the clearance groove (411) are set to correspond to each other; The inclined side (413) is an inclined plane or an inclined arc surface.
4. The rigidly lockable limitless positioner according to claim 2, characterized in that, A rotation limiting structure is also provided between the locking and releasing adjusting roller (400) and the outer sleeve (300) to limit the rotation range of the locking and releasing adjusting roller (400); The rotation limiting structure includes a rotation limiting spring (510) and a limiting slide groove (520). The rotation limiting spring (510) is disposed in either the locking adjusting roller (400) or the outer sleeve (300). The limiting slide groove (520) is disposed in the other one of the locking adjusting roller (400) and the outer sleeve (300). The locking adjusting roller (400) rotates, causing the rotation limiting spring (510) to slide within the limiting slide groove (520). When the rotation limiting spring (510) is located at the first end of the limiting slide groove (520), the locking and releasing adjusting roller (400) is in the locked position. At this time, the projection area of the hook (320) overlaps with the projection area of the cylinder (100). When the rotation limiting spring (510) is located at the second end of the limiting slide groove (520), the locking and releasing adjusting roller (400) is in the unlocked position. At this time, the projection area of the hook (320) is located outside the projection area of the cylinder (100).
5. The rigidly lockable limitless positioner according to claim 4, characterized in that, The bottom of the limiting slide groove (520) is provided with a protruding structure (530) for stabilizing the locking and releasing adjusting roller (400) in the locked position. When the locking and releasing adjusting roller (400) is in the locked position, the rotating limiting spring (510) is located between the protruding structure (530) and the first end of the limiting slide groove (520). The cross-section of the protruding structure (530) is a protruding dot shape. Each of the locking spring (310) and the rotation limiting spring (510) is provided in more than one manner, and the locking spring (310) and the rotation limiting spring (510) are respectively arranged in a circumferential manner around the outer sleeve (300) at intervals.
6. The rigidly lockable limitless positioner according to claim 5, characterized in that, Along the axial direction of the outer sleeve, the locking spring (310) is closer to the rear end of the outer sleeve (300) than the rotation limiting spring (510).
7. The rigidly lockable limitless positioner according to claim 6, characterized in that, Along the axial direction of the outer sleeve, the locking spring (310) and the rotation limiting spring (510) are respectively arranged.
8. The rigidly lockable limitless positioner according to claim 1, characterized in that, The outer wall of the outer sleeve (300) is provided with a positioning step (330), and the inner wall of the front end of the locking and adjusting roller (400) is provided with a first stepped groove (420). The positioning step (330) is in contact with the bottom of the first stepped groove (420). The outer sleeve (300) is provided with an outwardly inclined elastic buckle (340) that can be retracted radially inward along the outer sleeve (300). The inner side of the locking and adjusting roller (400) is formed with an annular positioning groove (430) for accommodating the elastic buckle (340). The elastic buckle (340) is slidably disposed in the annular positioning groove (430).
9. The rigidly lockable limitless positioner according to claim 8, characterized in that, Along the axial direction of the outer sleeve, the elastic buckle (340) is closer to the rear end of the outer sleeve (300) than the locking spring (310).
10. A rigidly lockable limitless positioner according to claim 1, characterized in that, The device includes a piston rod (200), which includes a piston end (210) and an extension end (220). The piston end (210) is disposed inside the cylinder (100) and slides in cooperation with the cylinder (100). The extension end (220) extends from the front end of the cylinder (100) and extends to the front end of the outer sleeve (300). The outer sleeve (300) is fixedly connected to the extension end (220) of the piston rod (200).