Trundle of low-gravity-center flat-bottom movable front brake

Abstract

The utility model provides a trundle with a low-gravity-center flat-bottom movable front brake, and relates to the technical field of trundles. The utility model discloses a low-gravity-center flat-bottom trundle of a movable front brake. The trundle comprises a brake supporting frame, the brake supporting frame is connected with the support assembly; the brake supporting frame is connected with the single-wheel assembly; the center pin is fixedly arranged on the brake supporting frame in a penetrating mode. The pedal is rotationally arranged on the center pin; the sliding block is arranged on the lower portion of the brake supporting frame in a sliding mode. And the tension spring is hung on the sliding block and the center pin together. The tension spring is stretched and restored by rotating the pedal up and down, due to the limiting of the small hole of the sliding block and the clamping groove in the center pin, the tension spring cannot slide to generate displacement, the reset function of the sliding block is stable, the sliding block is not prone to clamping stagnation, the braking sensitivity is high, and the effect of avoiding braking clamping stagnation is achieved.

Description

Technical Field

[0001] The utility model provides a caster with a low center of gravity, a flat bottom and a movable front brake, which relates to the technical field of casters. Background Art

[0002] Caster is a general term, including movable casters, fixed casters and movable casters with brakes. A movable caster is what we call a swivel caster, and its structure allows 360-degree rotation; a fixed caster is also called a directional caster, which has no rotating structure and cannot rotate. Usually, the two types of casters are generally used in combination. For example, the structure of a handcart is two directional wheels in the front and two swivel casters near the pushing armrest in the back.

[0003] The existing caster is assembled by a bracket assembly, a slider assembly, a brake assembly and a single-wheel assembly. When braking, the pedal rotates downward on the brake support frame, so that the pedal pushes the slider to slide and contact the single wheel, thereby realizing braking. At this time, the tension spring connected between the slider and the center pin on the pedal is stretched, so that the pedal holds the slider in place and locks it. When it is necessary to unlock the brake, the pedal can be rotated upward and turned over. At this time, the tension spring pulls the slider to reset, and the tension spring returns to its original state. However, when the pedal is rotated repeatedly, the tension spring will slide on the center pin, resulting in uneven reset force, unstable slider reset function, and easy jamming of the slider, affecting the sensitivity of braking.

[0004] Therefore, it is necessary to provide a caster with a low center of gravity, a flat bottom and a movable front brake that can avoid brake jamming. Content of the Utility Model

[0005] In order to overcome the shortcomings that when the pedal of the existing caster rotates reciprocally, the tension spring will slide on the center pin, resulting in uneven reset force, unstable slider reset function, easy jamming, and affecting the braking sensitivity, the utility model provides a caster with a low center of gravity, a flat bottom and a movable front brake that can avoid brake jamming.

[0006] In order to achieve the above object, the embodiment of the utility model provides the following technical solution: A caster with a low center of gravity, a flat bottom and a movable front brake, comprising: a brake support frame; a bracket assembly, the brake support frame is connected with a bracket assembly; a single-wheel assembly, the brake support frame is connected with a single-wheel assembly; a center pin, the brake support frame is fixedly penetrated with a center pin; a pedal, the pedal is rotatably arranged on the center pin; a slider, the slider is slidably arranged at the lower part of the brake support frame; a tension spring, the tension spring is commonly hung on the slider and the center pin; and further comprising: a positioning groove, the center pin is provided with a positioning groove, and one end of the tension spring is embedded in the positioning groove.

[0007] As a preferred technical solution of the utility model, two grooves corresponding to the protruding parts of the slider are arranged on the pedal, and the distances between the two grooves and the rotation axis of the pedal are different.

[0008] As a preferred technical solution of the utility model, the bracket assembly includes: a bracket; steel balls, a plurality of steel balls are placed on the bracket in a surrounding manner; an upper steel ball sleeve cover, the upper cover of the bracket is provided with an upper steel ball sleeve cover, and the steel balls are located between the upper steel ball sleeve cover and the bracket; a base plate, the upper steel ball sleeve cover is connected to the base plate; a wave disk, a wave disk is provided at the bottom of the bracket; small steel balls, a plurality of small steel balls are placed on the wave disk; large rivets, the base plate, the upper steel ball sleeve cover, the bracket and the wave disk are riveted together with large rivets.

[0009] As a preferred technical solution of the utility model, a plurality of mounting holes are provided on the bracket.

[0010] As a preferred technical solution of the utility model, the single wheel assembly includes: a connecting rod, a connecting rod is commonly passed through the bracket and the brake support frame; a nut, a nut is threadedly arranged on one end of the connecting rod; a bearing, two bearings are passed through the connecting rod; and a single wheel, a single wheel is rotatably connected to the two bearings.

[0011] As a preferred technical solution of the utility model, it also includes: a limiting spring sheet, two limiting spring sheets are installed at the bottom of the slider; and a small rivet, the limiting spring sheet and the slider are riveted and fixed by the small rivets.

[0012] As a preferred technical solution of the utility model, it also includes: a gasket, and the gasket is penetrated by the lower part of the large rivet.

[0013] Compared with the prior art, the caster provided by the embodiment of the utility model has the following advantages: 1. The tension spring is stretched and restored by rotating the pedal up and down. Due to the limitation of the small hole of the slider and the positioning groove on the center pin, the tension spring will not slide and produce displacement. The slider reset function is stable and not easy to get stuck. The brake sensitivity is high, thereby achieving the effect of avoiding brake jamming.

[0014] 2. By using two small rivets to rivet the two limit springs to the slider, when the pedal rotates downward, the limit springs will bend upward under the action of elasticity, and the limit springs will fit to the bottom of the pedal, making it difficult for the pedal to rotate, thereby preventing the pedal from rotating and separating from the slider and releasing the brake, thereby achieving the effect of enhancing the stability of the pedal. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional structural schematic diagram of the utility model.

[0016] Figure 2 It is a schematic diagram of the three-dimensional exploded structure of the bracket assembly of the utility model.

[0017] Figure 3 It is a three-dimensional exploded structural diagram of the brake support frame, pedal, center pin and other components of the utility model.

[0018] Figure 4This is a three-dimensional sectional view structure diagram of the bottom plate, bracket and wave disc of the present utility model.

[0019] Figure 5 This is a three-dimensional sectional view structure diagram of components such as a single wheel, connecting rod and nut of the present utility model.

[0020] Figure 6 This is a three-dimensional sectional view structure diagram of components such as a pedal, limit elastic piece and small rivet of the present utility model.

[0021] Figure 7 This is a three-dimensional sectional view structure diagram of components such as a center pin, tension spring and slider of the present utility model. The meanings of the reference numerals in the figure: 1: steel ball, 2: bracket, 3: brake support frame, 4: pedal, 5: center pin, 501: clamping groove, 6: limit elastic piece, 7: tension spring, 8: slider, 9: small rivet, 10: single wheel, 11: bearing, 12: bottom plate, 13: upper steel ball cover, 14: small steel ball, 15: wave disc, 16: gasket, 17: large rivet, 18: connecting rod, 19: nut. Detailed implementation manners

[0022] To make the purpose, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. It is hereby declared that the terms of orientation such as up, down, left, right, front, back, inside and outside that appear or will appear in the text of the present utility model are only based on the accompanying drawings of the present utility model, and they do not specifically limit the present utility model.

[0023] Embodiment 1: A caster with a low center of gravity and a flat bottom movable front brake. Refer to Figures 1-7 As shown, it includes: a brake support frame 3; a bracket assembly, the brake support frame 3 is connected with a bracket assembly; a single wheel assembly, the brake support frame 3 is connected with a single wheel assembly; a center pin 5, the brake support frame 3 is fixedly penetrated with a center pin 5 by riveting; a pedal 4, the center pin 5 is rotatably provided with a pedal 4; a slider 8, a slider 8 for braking is slidably provided at the lower part of the brake support frame 3, and two grooves corresponding to the protruding parts of the slider 8 are provided on the pedal 4, and the distances between the two grooves and the rotation axis of the pedal 4 are different, so that the pedal 4 can be fixed when pushing the slider 8 after rotation; a tension spring 7, the slider 8 and the center pin 5 are commonly hung with a tension spring 7; it further includes: a clamping groove 501, the center pin 5 is provided with a clamping groove 501, and one end of the tension spring 7 is embedded in the clamping groove 501.

[0024] Refer to Figure 2 and Figure 4As shown, the bracket assembly includes: a bracket 2, on which four mounting holes are provided to facilitate the installation of the bracket 2 on the bottom of the device through the mounting holes; steel balls 1, a number of steel balls 1 are placed around the bracket 2; an upper steel ball cover 13, the upper steel ball cover 13 is provided on the bracket 2, and the steel balls 1 are located between the upper steel ball cover 13 and the bracket 2; a bottom plate 12, the bottom plate 12 is connected to the upper steel ball cover 13; a wave plate 15, the wave plate 15 is provided at the bottom of the bracket 2; small steel balls 14, a number of small steel balls 14 are placed around the wave plate 15, and the small steel balls 14 are located between the wave plate 15 and the bracket 2; a large rivet 17, a large rivet 17 is riveted through the bottom plate 12, the upper steel ball cover 13, the bracket 2 and the wave plate 15 together.

[0025] Referring to Figure 3 and Figure 5 As shown, the single-wheel assembly includes: a connecting rod 18, the connecting rod 18 is passed through the bracket 2 and the brake support frame 3 together; a nut 19, one end of the connecting rod 18 is provided with a nut 19 in a threaded manner; bearings 11, two bearings 11 are passed through the connecting rod 18; a single wheel 10, the single wheel 10 is rotatably connected to the two bearings 11 together.

[0026] The bottom plate 12, the upper steel ball cover 13, the steel balls 1, the bracket 2, the steel balls, the wave plate 15 and the gasket 16 are riveted together with rivets on the die of the punching machine in sequence to form the bracket assembly. Then, the slider 8 is placed in the brake support frame 3, the pedal 4 is connected to the brake support frame 3 with a center pin 5, one end of the tension spring 7 is hooked on the center pin 5 with a circular hook, so that the tension spring 7 is trapped in the clamping groove 501. Then, the other end of the tension spring 7 is inserted into the small hole of the slider 8 with a tool, and then the brake support frame 3 and the pedal 4 are riveted together through the center pin 5 to form the brake assembly. Two pressure bearings are installed in the single wheel 10 to form the single wheel 10 assembly. The connecting rod 18 passes through the bracket 2, the brake support frame 3 and the two bearings 11 together, and the nut 19 is connected to the connecting rod 18 through threads to form the caster assembly. When it is necessary to stop the caster, by stepping on the pedal 4 downward, the pedal 4 rotates downward on the center pin 5, and at the same time, the pedal 4 pushes the slider 8 to slide, so that the slider 8 contacts the single wheel 10, causing the single wheel 10 to stop rotating to achieve braking. At this time, the tension spring 7 is stretched. When it is necessary to move through the single wheel 10, the pedal 4 is rotated upward, at this time, the tension spring 7 pulls the slider 8 to slide and reset to the side away from the single wheel 10, and the tension spring 7 is restored. Then, the single wheel 10 can rotate. When the tension spring 7 is stretched and restored, due to the limitation of the small hole of the slider 8 and the clamping groove 501 on the center pin 5, the tension spring 7 will not slide and displace.

[0027] Example 2: On the basis of Example 1, referring to Figure 6As shown, it also includes: a limiting spring piece 6, two limiting spring pieces 6 for pushing the limiting pedal 4 are installed at the bottom of the slider 8; and a small rivet 9, through which the limiting spring piece 6 and the slider 8 are riveted and fixed.

[0028] By using two small rivets 9 on the clamp of the riveting machine to rivet two limit springs 6 to the slider 8, when the pedal 4 rotates downward, the limit springs 6 will bend upward under the action of elasticity, and the limit springs 6 will fit to the bottom of the pedal 4, making it difficult for the pedal 4 to rotate, preventing the pedal 4 from detaching from the slider 8 and releasing the brake, thereby enhancing the stability of the pedal 4.

[0029] See also Figure 4 As shown, it also includes: a gasket 16, and the gasket 16 is passed through the lower part of the large rivet 17.

[0030] The connection stability between the large rivet 17 and each component is increased by the gasket 16 to prevent the components from loosening and causing the caster to loosen.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A caster with a low center of gravity, a flat bottom, and a movable front brake, comprising: A brake support frame (3); A bracket assembly, with the brake support frame (3) connected to the bracket assembly; A single-wheel assembly, with the brake support frame (3) connected to the single-wheel assembly; A center pin (5), fixedly penetrated through the brake support frame (3) with the center pin (5); A pedal (4), rotatably arranged on the center pin (5) with the pedal (4); A slider (8), slidably arranged at the lower part of the brake support frame (3) with the slider (8); A tension spring (7), commonly hung on the slider (8) and the center pin (5) with the tension spring (7); Characterized in that: also Including: A clamping groove (501), formed on the center pin (5) with the clamping groove (501), and one end of the tension spring (7) is embedded in the clamping groove (501).

2. The caster with a low center of gravity, a flat bottom, and a movable front brake according to claim 1, characterized in that: There are two grooves on the pedal (4) corresponding to the protruding parts of the slider (8), and the distances between the two grooves and the rotation axis of the pedal (4) are different.

3. The caster with a low center of gravity, flat bottom and movable front brake according to claim 1, characterized in that: The bracket assembly includes: A bracket (2); Steel balls (1), several steel balls (1) are placed around the bracket (2); An upper steel ball cover (13), covered on the bracket (2) with the upper steel ball cover (13), and the steel balls (1) are located between the upper steel ball cover (13) and the bracket (2); A bottom plate (12), connected to the upper steel ball cover (13) with the bottom plate (12); A wave plate (15), arranged at the bottom of the bracket (2) with the wave plate (15); Small steel balls (14), several small steel balls (14) are placed on the wave plate (15); A large rivet (17), commonly riveted and penetrated through the bottom plate (12), the upper steel ball cover (13), the bracket (2), and the wave plate (15) with the large rivet (17).

4. The caster with a low center of gravity, a flat bottom, and a movable front brake according to claim 3, characterized in that: Multiple mounting holes are formed on the bracket (2).

5. The caster with a low center of gravity, flat bottom and movable front brake according to claim 1, characterized in that: The single-wheel assembly includes: A connecting rod (18), commonly penetrated through the bracket (2) and the brake support frame (3) with the connecting rod (18); A nut (19), threadedly arranged at one end of the connecting rod (18) with the nut (19); Bearings (11), two bearings (11) are penetrated through the connecting rod (18); A single wheel (10), rotatably connected to the two bearings (11) together with the single wheel (10).

6. The caster with a low center of gravity, a flat bottom and a movable front brake according to claim 1, characterized in that: it also Including: Limit elastic pieces (6), two limit elastic pieces (6) are installed at the bottom of the slider (8); Small rivets (9), the limit elastic pieces (6) and the slider (8) are riveted and fixed through the small rivets (9).

7. The caster with a low center of gravity, flat bottom and movable front brake according to claim 3, characterized in that: Also including: A gasket (16), penetrated through the lower part of the large rivet (17) with the gasket (16).

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