Automatic aligning trundle

Abstract

The utility model relates to an automatic aligning caster, which belongs to the technical field of casters and comprises a support frame, a wheel and a brake pedal, the wheel and the brake pedal are both connected with the support frame, the brake pedal is used for braking the wheel, a bearing seat is arranged on the support frame, a rotating bearing is arranged on the inner side of the bearing seat, and the rotating bearing is connected with the support frame. A mounting shaft is arranged on the inner side of the rotating bearing, the mounting shaft is vertically arranged, and an aligning mechanism is arranged on the supporting frame; the return mechanism comprises an eccentric part and a rotary tension spring, the eccentric part and the mounting shaft are eccentrically arranged, in the rotating process of the rotary tension spring, the relative position between the rotary tension spring and the tension spring roller is not changed, that is, in the rotating process of the rotary tension spring around the mounting shaft, the rotary tension spring drives the tension spring roller to rotate on the eccentric shaft, and the rotary tension spring rotates around the mounting shaft. Compared with the prior art, sliding friction is converted into rolling friction, abrasion is reduced, noise is lowered, and the rotation flexibility of the supporting frame is improved.

Description

Technical Field

[0001] This utility model relates to an automatic self-aligning caster, belonging to the field of caster technology. Background Technology

[0002] Medical devices are various instruments used for medical treatment. They are mostly used in hospitals, sanatoriums, and other similar places. To facilitate movement, medical devices are usually equipped with casters.

[0003] Chinese utility model patent CN219727747U discloses an automatic reset silent caster, including a support frame, wheels, and a brake pedal. The wheels and brake pedal are connected to the support frame. A bearing sleeve is mounted on the support frame, with a bearing inside the sleeve and a rod inside the bearing. A tension spring fixing screw assembly is connected to the bottom of the rod, and a rivet is connected to the tension spring via the tension spring. The rivet is connected to the brake pedal. This utility model eliminates the need for manual pushing to return to the desired position, achieving 360-degree automatic reset during use. Furthermore, it automatically returns to the set position when the wheel leaves the ground, thus meeting user needs. However, in existing technology, after prolonged rotation, the pin and spring rotate relative to each other, causing wear at the connection point. This not only results in increased noise during rotation but also affects the flexibility of the support frame.

[0004] Therefore, there is a need for an automatic self-aligning caster to reduce noise and improve rotational flexibility. Summary of the Invention

[0005] The technical problem to be solved by this utility model is: in order to overcome the shortcomings of the prior art, to provide an automatic return caster that reduces noise and improves rotational flexibility.

[0006] The technical solution adopted by this utility model to solve the above problems is as follows: an automatic return caster, including a support frame, a wheel and a brake pedal. The wheel and the brake pedal are both connected to the support frame. The brake pedal is used to brake the wheel. A bearing seat is provided on the support frame. A rotating bearing is provided on the inner side of the bearing seat. An installation shaft is provided on the inner side of the rotating bearing. The installation shaft is arranged vertically. A return mechanism is provided on the support frame.

[0007] The return mechanism includes an eccentric component and a rotary tension spring. The eccentric component is eccentrically arranged with respect to the mounting shaft and is fixedly connected to the mounting shaft. Both ends of the rotary tension spring are connected to the support frame, and the rotary tension spring abuts against the side wall of the eccentric component.

[0008] The eccentric component includes an eccentric shaft and a tension spring roller. The eccentric shaft is parallel to the mounting shaft and is eccentrically arranged with respect to the mounting shaft. The top end of the eccentric shaft is fixedly connected to the mounting shaft. The tension spring roller is mounted on the eccentric shaft, and the rotary tension spring abuts against the outer peripheral wall of the tension spring roller.

[0009] Preferably, an annular groove is provided at the connection between the tension spring roller and the rotary tension spring, and the annular groove matches the rotary tension spring.

[0010] Preferably, the bearing housing has a top cover, through which the mounting shaft passes.

[0011] Preferably, a lower cover is fixedly installed on the support frame, and the lower cover covers the rotary tension spring.

[0012] Preferably, the brake pedal includes a pedal component and a brake pad, the pedal component is mounted on a support frame, and the pedal component is rotatably connected to a spring.

[0013] Preferably, the brake pedal further includes a locking element, which is connected to the pedal component.

[0014] Preferably, the support frame has a mounting through hole, and the bearing seat is snapped into the mounting through hole.

[0015] Compared with the prior art, the advantages of this utility model are:

[0016] This utility model discloses an automatic self-aligning caster. During the rotation of the slewing spring, the relative position between the slewing spring and the spring roller remains unchanged. That is, as the slewing spring rotates around the mounting shaft, it drives the spring roller to rotate on the eccentric shaft. Compared with the prior art, this converts sliding friction into rolling friction, reduces wear, thereby reducing noise and improving the flexibility of the support frame rotation. Attached Figure Description

[0017] Figure 1 This is a front view of an automatic self-aligning caster according to the present invention;

[0018] Figure 2 This is a right view of an automatic self-aligning caster according to the present invention;

[0019] Figure 3 for Figure 2 A sectional view along the AA direction;

[0020] Figure 4 This is a schematic diagram of the return mechanism.

[0021] in:

[0022] 1. Support frame; 2. Wheel; 3. Brake pedal; 4. Bearing seat; 5. Rotary bearing; 6. Mounting shaft; 7. Return mechanism; 8. Upper cover; 9. Lower cover.

[0023] Pedal component 31, brake pad 32

[0024] Eccentric component 71, rotary tension spring 72;

[0025] Eccentric shaft 711, tension spring roller 712. Detailed Implementation

[0026] like Figure 1-4 As shown, an automatic self-aligning caster in this embodiment includes a support frame 1, a wheel 2, and a brake pedal 3. The wheel 2 and the brake pedal 3 are both connected to the support frame 1. The brake pedal 3 is used to brake the wheel 2. The support frame 1 is provided with a bearing seat 4 and has an installation through hole. The bearing seat 4 is engaged with the installation through hole. A rotating bearing 5 is provided on the inner side of the bearing seat 4. An installation shaft 6 is provided on the inner side of the rotating bearing 5. The installation shaft 6 is arranged vertically. A self-aligning mechanism 7 is provided on the support frame 1.

[0027] The return mechanism 7 includes an eccentric component 71 and a rotary tension spring 72. The eccentric component 71 is eccentrically arranged with respect to the mounting shaft 6 and is fixedly connected to the mounting shaft 6. Both ends of the rotary tension spring 72 are connected to the support frame 1, and the rotary tension spring 72 abuts against the side wall of the eccentric component 71.

[0028] The eccentric component 71 includes an eccentric shaft 711 and a tension spring roller 712. The eccentric shaft 711 is parallel to the mounting shaft 6 and is eccentrically arranged with respect to the mounting shaft 6. The top end of the eccentric shaft 711 is fixedly connected to the mounting shaft 6. The tension spring roller 712 is mounted on the eccentric shaft 711, and the rotary tension spring 72 abuts against the outer peripheral wall of the tension spring roller 712.

[0029] An annular groove is provided at the connection between the tension spring roller 712 and the rotary tension spring 72, and the annular groove matches the rotary tension spring 72.

[0030] During use, the mounting shaft 6 is fixed to a related device, such as a stretcher. When the support frame 1 and the mounting shaft 6 rotate relative to each other, the rotary tension spring 72 rotates around the axis of the mounting shaft 6, and the rotary tension spring 72 is always in contact with the tension spring roller 712. Because the mounting shaft 6 and the mounting shaft 6 are eccentrically arranged, the tension spring roller 712 generates a thrust on the rotary tension spring 72, causing the rotary tension spring 72 to stretch. When the wheel 2 is in a suspended state, the rotary tension spring 72 releases the force, and causes the support frame 1 to rotate in the opposite direction around the axis of the mounting shaft 6 and reset. The reset of the support frame 1 drives the wheel 2 to reset, and the reset angle of the support frame 1 and the wheel 2 can reach 360 degrees.

[0031] Here, during the rotation of the rotary tension spring 72, the relative position between the rotary tension spring 72 and the tension spring roller 712 remains unchanged. That is, during the rotation of the rotary tension spring 72 around the mounting shaft 6, the rotary tension spring 72 drives the tension spring roller 712 to rotate on the eccentric shaft 711. Compared with the prior art, sliding friction is converted into rolling friction, which reduces wear, thereby reducing noise and improving the rotation flexibility of the support frame 1.

[0032] The bearing housing 4 is fixedly covered with an upper cover 8, and the mounting shaft 6 passes through the upper cover 8;

[0033] A lower cover 9 is fixedly installed on the support frame 1, and the lower cover 9 covers the rotary tension spring 72.

[0034] The brake pedal 3 includes a pedal component 31 and a brake pad 32. The pedal component 31 is mounted on the support frame 1 and is rotatably connected to the spring. When the wheel 2 needs to be braked, the pedal component 31 is pressed down, causing the brake pad 32 to contact the wheel 2. The wheel 2 is braked by the friction between the brake pad 32 and the wheel 2. When the wheel 2 needs to rotate, the pedal component 31 is lifted to reset, which in turn drives the brake pad 32 to reset, thus separating the brake pad 32 from the wheel 2.

[0035] Of course, the brake pedal 3 may also include a locking element, which is connected to the pedal component 31. When the pedal component 31 is pressed, the locking element enables the pedal component 31 to lock itself. When the wheel 2 needs to rotate, the locking element is operated to unlock the pedal component 31.

[0036] In summary, during the rotation of the rotary tension spring 72, the relative position between the rotary tension spring 72 and the tension spring roller 712 remains unchanged. That is, during the rotation of the rotary tension spring 72 around the mounting shaft 6, the rotary tension spring 72 drives the tension spring roller 712 to rotate on the eccentric shaft 711. Compared with the prior art, this converts sliding friction into rolling friction, reduces wear, thereby reducing noise and improving the rotational flexibility of the support frame 1.

[0037] In addition to the above embodiments, this utility model also includes other implementation methods. All technical solutions formed by equivalent transformation or equivalent substitution should fall within the protection scope of the claims of this utility model.

Claims

1. An automatic self-aligning caster, comprising a support frame (1), a wheel (2), and a brake pedal (3), wherein the wheel (2) and the brake pedal (3) are both connected to the support frame (1), the brake pedal (3) is used to brake the wheel (2), a bearing seat (4) is provided on the support frame (1), a rotating bearing (5) is provided on the inner side of the bearing seat (4), and a mounting shaft (6) is provided on the inner side of the rotating bearing (5), the mounting shaft (6) being arranged vertically, characterized in that: The support frame (1) is provided with a returning mechanism (7); The returning mechanism (7) comprises an eccentric part (71) and a rotary tension spring (72), the eccentric part (71) is eccentrically arranged with the mounting shaft (6), the eccentric part (71) is fixedly connected with the mounting shaft (6), both ends of the rotary tension spring (72) are connected with the support frame (1), and the rotary tension spring (72) abuts against the side wall of the eccentric part (71). The eccentric part (71) comprises an eccentric shaft (711) and a tension spring roller (712), the eccentric shaft (711) is parallel to the mounting shaft (6), the eccentric shaft (711) is eccentrically arranged with the mounting shaft (6), the top end of the eccentric shaft (711) is fixedly connected with the mounting shaft (6), and the tension spring roller (712) is installed on the eccentric shaft (711).

2. An automatic self-righting caster according to claim 1, wherein: The connecting position of the tension spring roller (712) and the rotary tension spring (72) is provided with an annular groove matched with the rotary tension spring (72).

3. An automatic self-righting caster according to claim 1, wherein: The top cover of the bearing seat (4) is provided with an upper cover (8), and the mounting shaft (6) penetrates through the upper cover (8).

4. The self-righting caster according to claim 1, wherein: The support frame (1) is fixedly provided with a lower cover (9), and the lower cover (9) covers the rotary tension spring (72).

5. The self-righting caster according to claim 1, wherein: The brake pedal (3) comprises a pedal part (31) and a brake pad (32), the pedal part (31) is arranged on the support frame (1), and the pedal part (31) is rotationally connected with the elastic sheet.

6. An automatic self-righting caster according to claim 5, wherein: The brake pedal (3) further comprises a locking part connected with the pedal part (31).

7. An automatic self-righting caster according to claim 1, wherein: The support frame (1) is provided with a mounting through hole, and the bearing seat (4) is clamped on the mounting through hole.

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