Cam-based universal wheel axle frame locking mechanism with manual control function

Abstract

The invention discloses a cam-based universal wheel axle frame locking mechanism with a manual control function, and relates to a universal wheel self-locking mechanism. The main components are a modified pull rod part and a rotary disc cam part. A pull rod of a traditional pull box is used for starting the self-locking device, so that the structural complexity is reduced; the brake can be started by directly lifting the pull box by grasping the pull rod; the pull rod drives a rotating disc to rotate within a certain angle through a connecting rod, the rotating disc presses a cam in a higher pair contact mode, the cam points to a specific direction by means of guidance of the cam, and then the universal wheel fixedly connected with the cam points to the specific direction. Two or more universal wheel shaft frames can be locked at the same time according to the design, and efficient braking is achieved. According to the mechanism, the universal wheel body is not required or optionally not modified, so that the reliability and durability of the universal wheel are ensured. The device has the advantages that original parts are utilized, the structure is simpler and more reliable, braking is more convenient, locking or unlocking is easier, and market requirements can be better met.

Description

Technical Field

[0001] The invention relates to a universal wheel brake device, in particular to a universal wheel axle frame locking mechanism based on a cam with manual control. Background Art

[0002] Universal wheels are so-called movable casters, and their structure allows 360-degree horizontal rotation. Casters are a general term, including movable casters and fixed casters. Fixed casters do not have a rotating structure and cannot rotate horizontally but only vertically. These two types of casters are generally used in combination. For example, the structure of a trolley is two fixed wheels in the front and two movable universal wheels in the back near the push handle. Universal wheels refer to the brackets installed on the caster wheels that can rotate 360 ​​degrees horizontally in dynamic or static loads, and four movable universal wheels are usually used on trolleys. Nowadays, more and more vehicles are equipped with universal wheels, but for universal wheels without locking function, it is not convenient to fix them when the vehicle stops, and the universal wheels may continue to roll. For example, when a suitcase encounters brakes on a bus, the suitcase moves due to inertia.

[0003] At present, the starting switches of the most commonly used locking devices are mostly on the universal wheels. When using them, they must be opened with the feet or by bending down and using the hands. Moreover, the universal wheels are often hidden under the suitcase and sometimes need to be pushed to the outside.

[0004] In addition, the universal wheel locking devices are mostly independent on a single universal wheel. Each time it is used, at least two locking devices must be pressed to achieve a certain braking effect, which is very inconvenient.

[0005] In addition, the locking mechanism of the universal wheel mostly acts on the roller of a single universal wheel or on the axle frame of the universal wheel. The braking effect of both is limited due to the forward direction of the vehicle movement, the tendency to move in the original direction after braking, the swinging in a small range in place, and the inability to brake multiple universal wheels at the same time. Summary of the invention

[0006] In view of the above problems, the present invention proposes a universal wheel axle frame locking mechanism based on a cam with manual control.

[0007] The present invention provides the following technical solution: utilizing the guiding property of the cam, using a rotating disk to press the cam in a high-pair contact manner, so that the cam points to a specific direction, and the universal wheel fixed to the cam also points to the specific direction, and finally points to Figure 7 The position of the luggage case is such that the two adjacent universal wheels are perpendicular to each other and point outwards, thereby preventing the luggage case from sliding to the greatest extent.

[0008] To achieve the above purpose, the present invention provides the following technical solution: a cam-based universal wheel axle frame locking mechanism with manual control, comprising (12) a chassis, a tie rod separation device, a multi-stage tie rod, a crank slider mechanism, (11) a turntable, (3) a cam, and (2) a universal wheel, characterized in that: the tie rod separation device controls the separation of the multi-stage tie rod, the separation rod (22) in the multi-stage tie rod is connected to the crank in the crank slider mechanism through a pin shaft, and the end of the slider in the crank slider mechanism is connected to (1 0) The limit connecting rod is connected by a pin shaft, (10) the limit connecting rod is provided with a keyway, (11) the turntable is provided with a (11-1) protruding pin shaft, the pin shaft is in the keyway, (12) the middle part of the chassis is provided with a (12-1) circular boss, (11) the center of the turntable is provided with a (11-2) circular hole, (11) the turntable is clamped on the (12-1) circular boss, the circular disk is in contact with (3) the cam by a high pair, and (3) the cam is fixedly connected with (2) the universal wheel through (5) the cam connecting shaft.

[0009] Preferably, the multi-stage pull rod is composed of an inner pull rod (23), a separation rod (22) and an outer pull rod (24), the outer pull rod (24) has a flange (24-1) at the uppermost inner edge, and the inner pull rod (23) has a flange (23-1) near the lower outer edge, and the two flanges are aligned with the separation rod (22) in the vertical direction.

[0010] Preferably, there is a (22-1) circular hole on one side of the (22) separation rod near the upper end, and there is a (24-2) vertical groove on the same side of the (24) outer pull rod, and the (22-1) circular hole, the (24-2) vertical groove and the (28) limiting pin of the pull rod separation device are aligned, and the (28) limiting pin passes through the (22-1) circular hole and the (24-2) vertical groove in sequence.

[0011] Preferably, a through circular hole (22-2) is provided near the lower end of the separation rod (22) and the short rod end of the L-shaped connecting rod (19), and an axle pin passes through the circular hole (22-1) to connect the separation rod (22) and the L-shaped connecting rod (19).

[0012] Preferably, there is a (19) L-shaped connecting rod (22-3) opening on the same side of the bottom end of the (24) outer pull rod and the (22) separation rod.

[0013] Preferably, the crank of the crank slider mechanism is a (19) L-shaped connecting rod, the slider is a (19) L-shaped connecting rod, the (19) L-shaped connecting rod and the (19) L-shaped connecting rod are connected by a pin shaft, and a (12-2) guide groove is provided on the (12) chassis, and the (19) L-shaped connecting rod can slide in the (12-2) guide groove.

[0014] Preferably, there are two groups of multi-stage connecting rods and two groups of crank slider mechanisms.

[0015] Preferably, the base circle radius direction of (3) the cam is consistent with the movement direction of (2) the universal wheel, that is, it is opposite to the direction of (2) the universal wheel.

[0016] Preferably, the pull rod separation device includes (15) a pull rod handle, (29) a pull rod button, (31) a button return spring, (27) a thrust rod, (26) a force-bearing slider, (28) a limit pin, (30) a pull rod guide extrusion slider, (14) a force-bearing slider guide bottom cover, and (24) a plurality of circular holes evenly distributed in the vertical direction on one side of the outer pull rod. This device is a common structure for the extension and retraction of most suitcase pull rods on the market and is used as a reuse mechanism in the present invention.

[0017] The invention is beneficial in that the activation method of the mechanism utilizes the pull rod of a traditional suitcase, triggers the brake with an action that people are accustomed to, and achieves high braking performance with minimal modification. The mechanism can brake multiple universal wheels at the same time, and the mechanism can be selected according to needs during design. The mechanism does not require or can be selected without modifying the universal wheel body, thereby ensuring the reliability and durability of the universal wheel.

[0018] It is worth noting that when using the brake, you need to grab the handle of the pull rod to slightly lift the box, and during the lifting process, the friction between the roller and the ground is reduced, which is conducive to the rotation of the universal wheel driven by the cam. The device has the beneficial effects of utilizing the original parts, making the structure simpler, making braking more convenient, locking or unlocking easier, and being more adaptable to market needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 Overall diagram of luggage compartment

[0021] Figure 2 Luggage compartment handle diagram

[0022] Figure 3 Luggage compartment handle side view

[0023] Figure 4 Front view of multi-stage pull rod

[0024] Figure 5 Side view of multi-stage tie rod

[0025] Figure 6 Luggage compartment chassis interior (without turntable)

[0026] Figure 7 Luggage compartment chassis interior (with turntable)

[0027] Figure 8 Turntable diagram

[0028] Fig. 9 Chassis diagram

[0029] Fig.10 Universal wheel diagram

[0030] Fig.11 Cam diagram

[0031] Description of Reference Numerals

[0032] 1 universal wheel connecting shaft, 2 universal wheel, 3 cam, 4 wheel frame, 5 cam connecting shaft, 6 thrust bearing, 10 limit connecting rod, 10-1 keyway, 11 turntable, 11-1 protruding pin, 11-2 circular hole, 12 chassis, 12-1 circular boss, 12-2 guide groove, 14 force slider guide bottom cover, 15 pull rod handle, 19, L-shaped connecting rod, 19L-shaped connecting rod, 22 separation rod, 22-1 circular hole, 22-2 penetrating circular hole, 22-3 make way slot, 23 inner pull rod, 23-1 flange, 24 outer pull rod, 24-1 flange, 24-2 vertical groove, 24-3 make way slot, 26 force slider, 27 thrust rod, 28 limit pin, 29 pull rod button, 30 pull rod guide extrusion slider, 31 button reset spring. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below in conjunction with the accompanying drawings, and the technical solution of the present invention is clearly and completely described. In the description of the present invention, it should be noted that the terms "1", "2", "3", "1-1", "2-1", etc. are only used to distinguish the structures of each component, and do not represent the order of front and back. The orientation or position relationship indicated by the terms "upper end", "lower end", "side wall", "side", "bottom", "one end", "the other end", etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. Unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be a connection between the two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] Embodiment 1: Manual control (button)

[0035] 1. Telescopic pull rod

[0036] Pressing the (29) lever button drives the (27) push rod downward, and the inclined block on the (26) locking slider at the lower end of the (27) push rod contacts the inclined block high pair on the (30) guide slider fixed with the (28) limit pin, pushing the (26) locking slider to move horizontally, and the (28) limit pin on the (26) locking slider is disengaged, and the lower section of the (23) inner pull rod is separated from the (22) separation rod, and the (23) inner pull rod is disconnected from the (24) outer pull rod, and the (23) inner pull rod is pulled up. When the pull rod length is close to the required pull rod length, the (29) lever button is released, and the (23) inner pull rod is continued to be pulled up. When the (28) limit pin reaches the equidistantly distributed circular holes on the (24) outer pull rod, it will pop out, limiting the pull rod from being pulled out further, so as to achieve different pull rod lengths as needed. As above, it is no different from a conventional luggage case pull rod.

[0037] (1) Open the lock

[0038] If the pull rod button (29) is not pressed and the pull rod is directly pulled up, the (28) limit pin will lock the (23) inner pull rod and the (22) separation rod, and the (23) inner pull rod drives the (22) separation rod to move upward along the inner wall of the (24) outer pull rod. The lower end of the (22) separation rod is connected to the short rod end of the (19) L-shaped connecting rod by an axle pin, and the long rod end of the (19) L-shaped connecting rod is connected to one end of the (19) L-shaped connecting rod by an axle pin. The (19) L-shaped connecting rod moves in the slideway on the chassis of the 12-pull box, and the other end is connected to the (10) limit connecting rod with a slide groove and flat. The two ends of the (10) limit connecting rod are connected to the (19) L-shaped connecting rods, and the two (19) L-shaped connecting rods move. Synchronous, (10) the limit connecting rod and (19) the L-shaped connecting rod move in the same direction; the center of the claw-type (11) turntable is fixed in the (12-1) circular boss at the center of the 12-pull box chassis, and there is a (11-1) protruding pin on the (11) claw-type turntable, which is sleeved in the (10-1) keyway of the (10) limit connecting rod. When the (10) limit connecting rod moves, the (11) claw-type turntable can rotate accordingly; the (11) claw-type turntable has four claws, and above the universal wheel there is a (3) cam fixed to the cam connecting shaft with a screw (5) and can rotate with the universal wheel. As the (11) claw-type turntable rotates, the four egg-shaped (3) cams drive the universal wheel to rotate in a specific direction and finally point to Figure 7 The position of the luggage case is such that the two adjacent universal wheels are perpendicular to each other and point outwards, thereby preventing the luggage case from moving to the greatest extent.

[0039] (2) Close the lock

[0040] It should be noted that in this example, after the turntable reaches the preset position and the universal wheel reaches the optimal locking position, the inner pull rod will return to the initial position due to its own weight, and the turntable will also return to the initial position, so the universal wheel cannot be locked. Although the universal wheel contacts the ground after the upper pull rod has traveled, the friction between the universal wheel and the ground can offset the weight of the inner pull rod to a certain extent, but the self-locking ability is inevitably greatly reduced, and the pull rod cannot be recovered after self-locking, and is exposed to the outside, affecting the use and appearance. A better way is to add a push-type elastic self-locking mechanism such as that in a ballpoint pen between the change-of-direction pull rod and the turntable. The turntable will not be able to rotate, and the pull rod can be put back to its original position. When the pull rod is pulled again according to the steps to enable the locking function, the turntable can rotate and the locking function is turned off.

[0041] Embodiment 2

[0042] Combined with the previous roller locking method, the universal wheel axle frame and the roller are locked at the same time to improve the braking ability.

[0043] Embodiment 3

[0044] In addition to the rotating claw-shaped turntable, the extruder can also use other forms of turntables or flat push rods to achieve the extrusion of the cam. In addition, a roller can be added to the end of the turntable or push rod to reduce the sliding friction when the cam is extruded.

[0045] Embodiment 4

[0046] The direction-changing pull rod can be replaced by a combination of a wire rope and a pulley to achieve the purpose of moving the pull rod to rotate the turntable.

[0047] Embodiment 5

[0048] This example diagram shows that all four universal wheels are locked by a four-claw turntable, which can achieve maximum braking, but the structure will occupy the entire chassis, which does not conform to the box structure of a general suitcase that can be divided into half. Therefore, a 180-degree two-claw turntable or a push rod with reverse translational motion combined with a wire rope pulley can be used to lock only the two universal wheels at the rear and the lower side of the pull rod.

[0049] It should be noted that embodiments 2 to 5 do not describe specific structures, but are only provided as some alternative solutions. In addition, some springs, axle pins, etc. described in embodiment 1 are not shown in the figures. Please understand.

[0050] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A cam-based universal wheel axle frame locking mechanism with manual control, comprising (12) a chassis, a tie rod separation device, a multi-stage tie rod, a crank slider mechanism, (11) a rotating disk, (3) a cam, and (2) a universal wheel, characterized in that: The pull rod separation device controls the separation of the multi-stage pull rods. The (22) separation rod in the multi-stage pull rod is connected to the crank in the crank slider mechanism through a pin shaft. The end of the slider in the crank slider mechanism is connected to the (10) limit connecting rod through a pin shaft. The (10) limit connecting rod has a keyway. The (11) turntable has a (11-1) protruding pin shaft, and the pin shaft is in the keyway. The (12) chassis has a (12-1) circular boss in the middle, and the (11) turntable has a 11-2 circular hole in the center. The (11) turntable is clamped on the (12-1) circular boss. The disk contacts the (3) cam with a high pair. The (3) cam is fixedly connected to the (2) universal wheel through the (5) cam connecting shaft.

2. According to the cam-based universal wheel axle frame locking mechanism with manual control as described in claim 1, the multi-stage pull rod is composed of an inner pull rod (23), a separation rod (22) and an outer pull rod (24), the outer pull rod (24) has a section (24-1) flange on the upper inner edge, and the inner pull rod (23) has a section (23-1) flange near the lower outer edge, and the two sections are aligned with the separation rod (22) in the vertical direction.

3. According to the cam-based universal wheel axle frame locking mechanism with manual control as described in claim 1, there is a (22-1) circular hole on one side of the (22) separation rod near the upper end, and there is a (24-2) vertical groove on the same side of the (24) outer pull rod, and the (22-1) circular hole, (24-2) vertical groove and (28) limit pin of the pull rod separation device are aligned, and the (28) limit pin passes through the (22-1) circular hole and (24-2) vertical groove in sequence.

4. According to the cam-based universal wheel axle frame locking mechanism with manual control as described in claim 1, a through circular hole (22-2) is provided near the lower end of the (22) release rod and the end of the short rod of the (19) L-shaped connecting rod, and an axle pin passes through the circular hole (22-1) to connect the (22) release rod and the (19) L-shaped connecting rod.

5. According to the cam-based universal wheel axle frame locking mechanism with manual control as described in claim 1, there is a (19) L-shaped connecting rod (22-3) giving way slot on the same side of the bottom end of the (24) outer pull rod and the (22) release rod.

6. According to the cam-based universal wheel axle frame locking mechanism with manual control as described in claim 1, the crank of the crank slider mechanism is (19) an L-shaped connecting rod, the slider is (20) a change-of-direction pull rod, the (19) L-shaped connecting rod and the (20) change-of-direction pull rod are connected by a pin shaft, and a (12-2) guide groove is provided on the (12) chassis, and the (20) change-of-direction pull rod can slide in the (12-2) guide groove.

7. According to the cam-based, hand-controlled universal wheel axle frame locking mechanism of claim 1, there are two groups of multi-stage connecting rods and crank slider mechanisms.

8. According to the cam-based, hand-controlled universal wheel axle frame locking mechanism of claim 1, the base circle radius direction of (3) the cam is consistent with the movement direction of (2) the universal wheel, that is, it is opposite to the direction of (2) the universal wheel.

9. According to the cam-based universal wheel axle frame locking mechanism with manual control as described in claim 1, the pull rod separation device includes (15) a pull rod handle, (29) a pull rod button, (31) a button return spring, (27) a thrust rod, (26) a force-bearing slider, (28) a limit pin, (30) a pull rod guide extrusion slider, (14) a force-bearing slider guide bottom cover, (24) a plurality of circular holes evenly distributed in the vertical direction on one side of the outer pull rod, and the device is a common structure for most luggage suitcase pull rod extensions on the market, and is used as a reuse mechanism in the present invention.

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