Brake trundle

Abstract

The utility model discloses a brake caster which comprises a caster shell and a caster body rotationally arranged on the caster shell, a driving piece and a brake rod are arranged on the caster shell, the driving piece comprises a driving part and a linkage part, a rotating fulcrum rotationally matched with the caster shell is formed at the joint of the linkage part and the driving part, and the brake rod is arranged on the driving part. The driving part comprises a first pedal part and a second pedal part, the first pedal part and the second pedal part are located on the two sides of a rotating fulcrum, and the middle of the brake rod is rotationally connected with the wheel shell. The brake rod is driven to swing through rotation of the driving part, so that the brake block on the brake rod and the brake groove in the wheel body are switched between the clamping fit and the clamping fit separation, namely, switching of the locking state and the unlocking state of the wheel body is achieved, and therefore the brake structure of the trundle is simpler, the number of parts is smaller, and the cost is lower.

Description

Technical Field

[0001] The utility model relates to a caster, in particular to a brake caster. Background Art

[0002] Existing chairs have different needs according to different users. There are chairs with different functions such as liftable chairs and movable chairs. In order to facilitate the transfer of chairs, movable chairs are more and more popular. In order to improve the stability of the chair, the casters need to be braked and locked when the user needs to be in a fixed position.

[0003] At present, there are many types of brake casters on the market with different structures. For example, a Chinese invention patent (application announcement number: CN111376648A) provides a caster device, including a wheel seat, a moving unit, a brake unit and a driving unit. The wheel seat defines two first axial holes that are spaced apart from each other and are located above the first axial holes; the moving unit includes an axle passing through the first axial hole, two rotating wheels installed at the left and right ends of the axle and capable of rotating, each rotating wheel includes an inner side surface facing the other rotating wheel, and at least one inner side surface is provided with a plurality of spaced apart and arranged around its own axis. The first tooth block, two adjacent first tooth blocks jointly define a first tooth groove; the brake unit is arranged in the accommodating space, and includes a brake seat defining a through hole, a first brake rod inserted between the wheel seat and the through hole, and a first elastic member arranged between the brake seat and the wheel seat, the brake seat can move between a braking position and an active position relative to the wheel seat, and in the braking position, the horizontal position of the brake seat is higher than that in the active position, the first brake rod moves upward at the same time and at least one end is embedded in the corresponding first tooth groove, and the first elastic member constantly moves the brake seat to the active position.

[0004] The drive unit includes a brake driving plate pivotally mounted on the wheel seat, located above the brake driving plate and pivotally mounted on the wheel seat for releasing the brake driving plate, the brake driving plate having a first pivot pivotally connected to the wheel seat, a supporting portion located on one side of the brake driving plate and capable of supporting the brake seat, a first pedal portion located on the other side of the brake driving plate and exposed to the wheel seat, and a first fixed portion facing the brake releasing driving plate, the brake releasing driving plate having a second pivot pivotally connected to the wheel seat, a second fixing portion capable of interlocking with the first fixing portion, and a second pedal portion exposed to the wheel seat, swinging the first pedal portion downward can cause the supporting portion to push the brake seat upward to move it to the braking position, and cause the first fixing portion and the second fixing portion to interlock with each other, swinging the second pedal portion downward can cause the first fixing portion to be separated from the second fixing portion, and the first elastic member will move the brake seat downward to an active position.

[0005] There is also a Chinese invention patent (application announcement number: CN113427948A) which provides a brake caster, including a wheel frame, a wheel body, a sliding member and a cam, the wheel body is rotatably arranged on the wheel frame, a wheel cavity is arranged on one side of the wheel body, and a first clamping portion is arranged on the inner side wall of the wheel cavity; the sliding member is arranged on the wheel frame and can move radially along the wheel body, a second clamping portion and a transmission portion are arranged on the sliding member, and the second clamping portion can cooperate with the first clamping portion; the cam is rotatably arranged on the wheel frame, the wheel axle of the cam is arranged in the same direction as the wheel axle of the wheel body, preferably, the wheel axle of the cam is arranged coaxially with the wheel axle of the wheel body, the driving member can be configured as a lever or a knob, etc., the cam is fixed to the lever, and the cam can be driven to rotate by turning the lever, and a part of the lever can protrude from the wheel frame to facilitate turning the lever; if the driving member is a knob, similarly, the knob is arranged on the outside of the wheel frame or the wheel body, and the knob is fixed to the lever, so that rotating the knob can drive the cam to rotate, thereby playing a driving role.

[0006] When the caster brakes, the cam is rotated to drive the sliding part to move, and the movement of the sliding part drives the second clamping part to move and make the second clamping part cooperate with the first clamping part to fix the wheel body relative to the wheel frame, thereby braking the caster. Since the caster can be braked by the cam, the sliding part, the first clamping part and the second clamping part, it can be seen that the number of related components that affect the braking action of the caster is small, the structure is simple, the action is reliable, and the failure rate of the caster during braking can be reduced.

[0007] However, the above-mentioned casters have the disadvantages of complex structural arrangement, more parts are required to achieve braking, higher manufacturing cost and lower stability, and therefore, there is an urgent need to improve the prior art. Utility Model Content

[0008] The purpose of the utility model is to solve the above problems. The utility model provides a brake caster, which has the advantages of being able to switch between the locked and unlocked states of the wheel body directly by stepping on it, and having a simpler structure and lower cost.

[0009] To achieve the above-mentioned purpose, the utility model provides the following technical solution: it includes a wheel shell, a wheel body rotatably arranged on the wheel shell, a driving member and a brake rod are arranged on the wheel shell, the driving member includes a driving part and a linkage part, a connection between the linkage part and the driving part forms a rotating fulcrum that rotates with the wheel shell, the driving part includes a first pedal part and a second pedal part, the first pedal part and the second pedal part are located on both sides of the rotating fulcrum, the middle part of the brake rod is rotatably connected to the wheel shell, the free end of the linkage part is hinged to the first end of the brake rod, the second end of the brake rod is provided with a brake block, and the inner wall of the wheel body is circumferentially provided with a brake groove that cooperates with the brake block.

[0010] Preferably, a groove is provided on the wheel housing, and a connecting shaft which cooperates with the groove is provided at the middle of the brake rod.

[0011] Preferably, a first arc-shaped groove is provided on the wheel shell, and the first arc-shaped groove is arranged along the circumference of the groove.

[0012] Preferably, the linkage portion is provided with a convex shaft, and the brake rod is provided with a second arc-shaped groove for buffering, and the second arc-shaped groove is arranged along the circumference of the convex shaft.

[0013] Preferably, the wheel housing includes an open end, and the driving member is rotatably disposed at the open end.

[0014] Preferably, the driving member also includes a limit plate, which is located between the second pedal part and the linkage part, and the wheel shell is provided with a first slope and a second slope, the first slope cooperates with the first pedal part stopper, and the limit plate cooperates with the second slope stopper.

[0015] Preferably, a baffle plate is extended from the upper end of the first pedal portion and cooperates with the stopper at the upper end of the wheel housing.

[0016] Preferably, the wheel housing is provided with a clearance groove for the brake rod to move.

[0017] Preferably, a plurality of convex strips are provided on the first pedal portion and the second pedal portion.

[0018] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0019] The utility model provides a brake caster, which drives the driving member to rotate by the first pedal part and the second pedal part on the pedal driving member, and drives the brake rod to swing by the rotation of the driving member, so that the brake block on the brake rod and the brake groove on the wheel body are switched between a snap fit and a disengagement from the snap fit, that is, the locking and unlocking states of the wheel body are switched. Therefore, the brake structure of the caster of the present application is simpler, has fewer parts, and has lower costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional structural schematic diagram of the utility model in a locked state;

[0021] Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model in a locked state;

[0022] Figure 3 It is a schematic diagram of the three-dimensional structure of the utility model in the unlocked state;

[0023] Figure 4 It is a schematic diagram of the cross-sectional structure of the utility model having a first arc-shaped groove in the unlocked state;

[0024] Figure 5 It is a three-dimensional structural schematic diagram of the driving member, brake rod and wheel body of the utility model;

[0025] Figure 6 It is a schematic diagram of the cross-sectional structure of the utility model with a second arc-shaped groove in the unlocked state.

[0026] Description of the drawings: 1. wheel shell; 10. reinforcement plate; 101. groove; 102. first arc-shaped groove; 103. second arc-shaped groove; 11. first slope; 12. second slope; 2. wheel body; 21. brake groove; 3. driving member; 31. first pedal part; 32. second pedal part; 33. baffle; 34. limit plate; 35. convex strip; 36. rotating shaft; 37. linkage part; 371. convex shaft; 4. brake rod; 41. brake block; 42. connecting shaft. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] like Figure 1-Figure 6 As shown, a brake caster comprises a wheel shell 1, a wheel body 2 rotatably arranged on the wheel shell 1, a driving member 3 and a brake rod 4 are arranged on the wheel shell 1, the driving member 3 comprises a driving part and a linkage part 37, a rotation fulcrum rotatably matched with the wheel shell 1 is formed at the connection between the linkage part 37 and the driving part, the driving part comprises a first pedal part 31 and a second pedal part 32, the first pedal part 31 and the second pedal part 32 are located on both sides of the rotation fulcrum, the middle part of the brake rod 4 is rotatably connected with the wheel shell 1, the free end of the linkage part 37 is hinged to the first end of the brake rod 4, the second end of the brake rod 4 is provided with a brake block 41, and the inner wall of the wheel body 2 is circumferentially provided with a brake groove 21 matched with the brake block 41

[0029] The side of the brake block 41 close to the brake groove 21 is arc-shaped, so it can enter the brake groove 21 more smoothly.

[0030] A reinforcing plate 10 is disposed inside the wheel housing 1 , a groove 101 is disposed on the reinforcing plate 10 , and a connecting shaft 42 which is matched and connected with the groove 101 is disposed in the middle of the brake lever 4 .

[0031] Furthermore, the wheel body 2 is rotatably connected to the reinforcing plate 10 .

[0032] A first pedal portion 31, a second pedal portion 32, a rotating shaft 36 and a linkage portion 37, wherein the first pedal portion 31 and the second pedal portion 32 are arranged at an angle, and the rotating shaft 36 is arranged at the rotation fulcrum. Further, an obtuse angle is formed between the first pedal portion 31 and the second pedal portion 32, the rotating shaft 36 is arranged at one end of the linkage portion 37, and the rotating shaft 36 is rotatably arranged on the wheel housing 1. The first pedal portion 31 and the second pedal portion 32 rotate around the axis of the rotating shaft 36, and the linkage portion 37 is arranged in the wheel housing 1, and the other end of the linkage portion 37 has a convex shaft 371, and one end of the brake lever 4 is rotatably connected to the outer periphery of the convex shaft 371.

[0033] A baffle plate 33 is extended from the front end of the first pedal portion 31 , and the baffle plate 33 is engaged with the upper end surface of the wheel housing 1 by a stopper.

[0034] The reinforcing plate 10 is provided with a first arc groove 102 for buffering, and the brake rod 4 is provided with a second arc groove 103 for buffering. The first arc groove 102 is circumferentially arranged along the groove 101 , and the second arc groove 103 is circumferentially arranged along the convex shaft 371 .

[0035] The first arc groove 102 and the second arc groove 103 may be provided at the same time, or only one of them may be provided to achieve a buffering function.

[0036] The driving member 3 further includes a limit plate 34 . The wheel housing 1 is provided with a first slope 11 and a second slope 12 . The first slope 11 is matched with the first pedal portion 31 for stopping, and the limit plate 34 is matched with the second slope 12 for stopping.

[0037] The first pedal portion 31 and the second pedal portion 32 are provided with a plurality of convex strips 35 , so that the friction between the first pedal portion 31 and the second pedal portion 32 can be increased, so that the first pedal portion 31 and the second pedal portion 32 can be stepped on better.

[0038] In the locked state, the first pedal portion 31 is engaged with the first slope 11 in a stop manner, and the brake block 41 is located in the brake groove 21 of the wheel body 2 .

[0039] When unlocking is required: by stepping on the second pedal part 32, the first pedal part 31, the second pedal part 32, the linkage part 37 and the limit plate 34 rotate around the axis of the rotating shaft 36, so that the limit plate 34 cooperates with the stop of the second slope 12, and the first pedal part 31 is disengaged from the stop cooperation with the first slope 11, and the linkage part 37 rotates around the rotating shaft 36 while driving the brake rod 4 to rotate around the connecting shaft 42, and then drives the brake block 41 to rotate around the axis of the connecting shaft 42, so that the brake block 41 is disengaged from the brake groove 21, thereby achieving the function of unlocking the wheel body 2.

[0040] When locking is required: by stepping on the first pedal part 31 or the baffle plate 33, the first pedal part 31, the second pedal part 32, the linkage part 37 and the limit plate 34 rotate in the opposite direction around the axis of the rotating shaft 36, so that the first pedal part 31 cooperates with the stop of the first slope 11, and the limit plate 34 disengages from the stop cooperation with the second slope 12, and the linkage part 37 rotates in the opposite direction around the rotating shaft 36 while driving the brake rod 4 to rotate in the opposite direction around the connecting shaft 42, thereby causing the brake block 41 to rotate in the opposite direction around the axis of the connecting shaft 42, so that the brake block 41 is snap-fitted with the brake groove 21, thereby locking the wheel body 2.

[0041] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0042] 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 brake caster, comprising a wheel housing (1) and a wheel body (2) rotatably disposed on the wheel housing (1), characterized in that: The wheel housing (1) is provided with a driving member (3) and a brake rod (4), the driving member (3) comprising a driving portion and a linkage portion (37), a rotation fulcrum for rotationally cooperating with the wheel housing (1) is formed at a connection between the linkage portion (37) and the driving portion, the driving portion comprising a first pedal portion (31) and a second pedal portion (32), the first pedal portion (31) and the second pedal portion (32) being located on both sides of the rotation fulcrum, a middle portion of the brake rod (4) being rotationally connected with the wheel housing (1), a free end of the linkage portion (37) being hinged to a first end of the brake rod (4), a brake block (41) being provided at a second end of the brake rod (4), and a brake groove (21) for cooperating with the brake block (41) being circumferentially provided on an inner wall of the wheel body (2).

2. A brake caster according to claim 1, characterized in that: The wheel housing (1) is provided with a groove (101), and the middle part of the brake rod (4) is provided with a connecting shaft (42) that is matched and connected to the groove (101).

3. A brake caster according to claim 2, characterized in that: The wheel housing (1) is provided with a first arc-shaped groove (102) for buffering, and the first arc-shaped groove (102) is arranged along the circumference of the groove (101).

4. The brake caster according to claim 2, characterized in that: The linkage portion (37) is provided with a convex shaft (371), and the brake rod (4) is provided with a second arc-shaped groove (103) for buffering, wherein the second arc-shaped groove (103) is arranged along the circumference of the convex shaft (371).

5. The brake caster according to claim 1, characterized in that: The wheel housing (1) comprises an open end, and the driving member (3) is rotatably disposed on the open end.

6. A brake caster according to claim 5, characterized in that: The driving member (3) further comprises a limit plate (34), the limit plate (34) being located between the second pedal portion (32) and the linkage portion (37), the wheel housing (1) being provided with a first slope (11) and a second slope (12), the first slope (11) being engaged with a stopper of the first pedal portion (31), and the limit plate (34) being engaged with a stopper of the second slope (12).

7. The brake caster according to claim 6, characterized in that: A baffle (33) is extended from the upper end of the first pedal portion (31) and cooperates with the upper end stop of the wheel housing (1).

8. The brake caster according to claim 1, characterized in that: The wheel housing (1) is provided with a clearance groove for the brake rod (4) to move.

9. The brake caster according to claim 1, characterized in that: A plurality of convex strips (35) are provided on the first pedal portion (31) and the second pedal portion (32).

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