Three-gear trundle of novel brake structure
By designing the helical teeth of the split first rocker and the second rocker with the second internal tooth member, the problem of unsmooth pedaling in the prior art is solved, and a more labor-saving pedaling and smoother brake effect is achieved.
Patent Information
- Application Number
- CN202420233113.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-31
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-01-31
AI Technical Summary
The existing multi-pedal control casters are not smooth enough when stepping on the multi-function pedal due to the high rigidity of the first rocker.
A split first rocker structure consisting of the first plate body and the second plate body hinged together is designed, and a helical toothing is used between the second rocker and the second internal tooth member to lower the first rocker. The structural rigidity improves the smoothness of trampling.
This makes the multi-function pedal more effort-saving and smoother when pedaling. The combination of the second rocker and the helical teeth of the second internal tooth member achieves faster and smoother entry.
Smart Images
Figure CN222246707U_ABST
Abstract
Description
Technical field:
[0002] The utility model relates to a three-speed caster with a novel brake structure. Background technology:
[0004] With the development of society, various medical casters emerge in an endless stream, and the requirements for caster function sets are increasing. Multi-pedal controlled casters are produced to meet this market demand.
[0005] Chinese patent publication number CN116039288B discloses a multi-pedal controlled caster and a method of using the same, comprising a main frame, a connecting rod, a directional mechanism, a brake mechanism, a reset mechanism, a first inner tooth member, a second inner tooth member, a pair of wheel members and three elastic members. The main frame can rotate relatively and is combined with the connecting rod. The first inner tooth member and the second inner tooth member are fixedly mounted on the connecting rod. By stepping on the multi-functional pedal, the multi-functional pedal pushes against a first seesaw, so that the first seesaw is clamped in a first groove of a first inner tooth member, so that the caster can travel in a directional manner. Stepping on the multi-functional pedal again pushes the multi-functional pedal against the auxiliary brake member, and then pushes against the second seesaw, so that the second clamping portion of the second seesaw is clamped in the second groove of the second inner tooth member, and the third clamping portion of the second seesaw is clamped in the limiting gear of the wheel member, so that the caster can be oriented and braked. Through this method, the caster can perform functions such as steering, orientation and braking.
[0006] However, in the caster structure disclosed in the above patent, the first rocker plate is an integrated structure, which has a relatively large rigidity and is more laborious when stepping on the multi-functional pedal, resulting in an unsmooth stepping. Utility model content:
[0008] The utility model makes improvements on the problems existing in the above-mentioned prior art, that is, the technical problem to be solved by the utility model is to provide a three-speed caster with a new brake structure, which has a reasonable design and effectively improves the smoothness of pedaling when the caster brakes.
[0009] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a three-speed caster with a new brake structure, including a main body bracket with a wheel part, a connecting rod with one end extending into the interior of the main body bracket and rotatably connected to the main body bracket, a first internal tooth part is fixedly installed on the connecting rod, and a first rocker is hinged inside the main body bracket, and the first rocker is pushed by a multi-functional pedal to swing to cooperate with the first internal tooth part, the first rocker includes a first plate body having a receiving part for facilitating abutment of the pushing part of the multi-functional pedal, a second plate body having a clamping part for facilitating clamping into the groove part of the first internal tooth part, and an elastic part, the first plate body and the second plate body are hinged by a hinge, the elastic part is sleeved on the outside of the hinge, and the two ends of the elastic part respectively abut on the first plate body and the second plate body.
[0010] Furthermore, a hinge slot is provided at one end of the first plate body away from the abutting portion, and two hinge plates are provided at one end of the second plate body away from the clamping portion, and the hinge plates extend into the hinge slot, and hinge through holes are provided on the two hinge plates and the two side walls of the hinge slot; the hinge part is a hinge shaft, and the hinge shaft passes through the hinge through holes of the hinge plates and the side walls of the hinge slot to realize the hinge connection between the first plate body and the second plate body.
[0011] Furthermore, the elastic member is a torsion spring arranged between the two hinged plates, and the torsion spring includes a sleeve portion sleeved on the outside of the hinge shaft, and limited abutment portions are extended from both ends of the sleeve portion, and the limited abutment portions at both ends of the sleeve portion abut against the first plate body and the second plate body respectively.
[0012] Furthermore, a supporting step for supporting the first plate body is provided below the hinged plate.
[0013] Furthermore, a second inner tooth part fixedly mounted on the connecting rod is provided below the first inner tooth part, and a second rocker is provided inside the main body bracket. The second rocker is hinged to the first plate body or the second plate body, and the second rocker is pushed by the multi-functional pedal to swing and rotate to cooperate with the second inner tooth part.
[0014] Furthermore, two spaced-apart connecting plates are provided at the lower part of the second plate body, through holes are provided on the connecting plates, grooves are provided on the second rocker for the two connecting plates to pass through, holes are provided on the walls on both sides of the grooves, a first pivot member is passed between the through holes and the holes, and the second plate body of the first rocker and the second rocker are hinged to the main bracket through the first pivot member.
[0015] Furthermore, a circle of first bevel teeth is coaxially arranged at the bottom of the second inner tooth part, and second bevel teeth distributed in an arc shape are arranged at the top of one end of the second rocker close to the second inner tooth part. When the second rocker swings, the second bevel teeth engage or disengage with the first bevel teeth.
[0016] Furthermore, the first inner tooth part is provided with two symmetrically distributed positioning circular holes, and the positioning circular holes are vertically penetrated; the top of the second inner tooth part is provided with two symmetrically distributed positioning columns, the two positioning columns correspond to the positions of the two positioning circular holes, and the positioning columns pass through the positioning circular holes.
[0017] Furthermore, a clamping block for clamping into the groove of the first inner tooth member is provided at one end of the second plate body away from the hinge member, and the clamping block is the clamping portion of the second plate body.
[0018] Furthermore, the clamping block is made of metal material, the first plate body and the second plate body are both made of plastic injection molding, and the clamping block and the second plate body are integrally injection molded.
[0019] Compared with the prior art, the utility model has the following effects: the utility model is reasonably designed, and the first rocker of the three-speed caster is designed to be a split structure composed of a first plate body and a second plate body hinged together, thereby reducing the structural rigidity of the first rocker plate, making the multi-functional pedal more labor-saving and smoother to step on. Description of the drawings:
[0021] Figure 1 It is a cross-sectional three-dimensional structural schematic diagram of an embodiment of the utility model;
[0022] Figure 2 It is a schematic diagram of the three-dimensional structure after omitting one side wheel member in the embodiment of the utility model;
[0023] Figure 3 This is a schematic diagram of a fully free state in an embodiment of the utility model;
[0024] Figure 4 This is a diagram of the return state of the multifunctional pedal after braking in the embodiment of the utility model;
[0025] Figure 5 It is a schematic diagram of the cooperation between the first and second seesaw plates and the first and second inner gear members in the embodiment of the utility model;
[0026] Figure 6 Schematic diagram of the exploded state of the first seesaw in the embodiment of the utility model;
[0027] Figure 7 It is a schematic diagram of the three-dimensional structure of the second seesaw in the embodiment of the utility model;
[0028] Figure 8 It is a schematic diagram of the three-dimensional structure of the first internal tooth member in the embodiment of the utility model;
[0029] Fig. 9 The three-dimensional structure diagram of the second inner tooth member in the embodiment of the utility model is shown in FIG. Figure 1 ;
[0030] Fig.10 The three-dimensional structure diagram of the second inner tooth member in the embodiment of the utility model is shown in FIG. Figure 2 . Specific implementation method:
[0032] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.
[0033] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0034] like Figures 1 to 10 As shown, the utility model is a three-speed caster with a novel brake structure, which is improved on the basis of a caster with multi-pedal control and a method of use disclosed in Chinese patent publication No. CN116039288B to overcome the problem of uneven pedaling of the multi-functional pedal, and includes a main frame 1 with a wheel member 2, a connecting rod 3 with one end extending into the main frame 1 and rotatably connected to the main frame 1, a first inner tooth member 4 is fixedly mounted on the connecting rod 3, a first seesaw 5 is hinged inside the main frame 1, and the first seesaw 5 is pushed by the multi-functional pedal 6 to swing and match with the first inner tooth member 4; the specific improvement is that the first seesaw 5 includes a first plate body 51 with a receiving portion 53, a first plate body 52 with a locking portion 54, a first plate body 53 with a locking portion 55, a first plate body 54 with a locking portion 56, a first plate body 55 with a locking portion 57, a first plate body 56 with a locking portion 58, a first plate body 57 with a locking portion 59, a first plate body 58 with a locking portion 51, a first plate body 51 with a locking portion 54, a first plate body 52 with a locking portion 56, a first plate body 52 with a locking portion 58, a first plate body 51 ... The second plate body 52 and the elastic member 56 of the control part 54, the receiving part 53 of the first plate body is conducive to the abutment of the pushing part of the multi-function pedal 6, and the clamping part 54 of the second plate body 52 is conducive to clamping into the groove part 41 of the first inner tooth part 4. The first plate body 51 and the second plate body 52 are hinged by a hinge 55, and the elastic member 56 is sleeved on the outside of the hinge 55. The two ends of the elastic member 56 are respectively abutted on the first plate body 51 and the second plate body 52. The elastic member keeps abutting against the first plate body and the second plate body under normal conditions. When the multi-function pedal is stepped on, the first plate body swings under the drive of the multi-function pedal, and the first plate body drives the second plate body to swing through the elastic member, so that the clamping part on the second plate body is clamped into the groove part of the first inner tooth part. The first rocker plate of the three-speed caster disclosed in Chinese Patent Publication No. CN116039288B is designed as a split structure consisting of a first plate body and a second plate body hinged together, which reduces the structural rigidity of the first rocker plate and makes the multifunctional pedal more labor-saving and smoother to pedal.
[0035] In this embodiment, a hinge slot 511 is provided at one end of the first plate body 51 away from the abutting portion 53, and two hinge plates 521 are provided at one end of the second plate body 52 away from the clamping portion 54. The hinge plates 521 extend into the hinge slot 511, and hinge through holes 522 are provided on the two hinge plates 521 and the two side walls of the hinge slot 511. The hinge member 55 is a hinge shaft, which passes through the hinge plates 521 and the hinge through holes 522 on the side walls of the hinge slot 511, so as to realize the hinge connection between the first plate body 51 and the second plate body 52.
[0036] In this embodiment, the elastic member 56 is a torsion spring disposed between the two hinge plates 521, and the torsion spring includes a sleeve portion 562 sleeved on the outside of the hinge shaft, and limited abutment portions 561 are respectively extended from both ends of the sleeve portion 562, and the limited abutment portions 561 at both ends of the sleeve portion are respectively abutted against the first plate body 51 and the second plate body 52. Further, a support step 57 for supporting the first plate body is disposed below the hinge plate 521, and in the normal state of the torsion spring, the bottom of the first plate body 51 is in contact with the support step 57 under the abutment of the torsion spring.
[0037] In this embodiment, a second inner tooth member 7 fixedly mounted on the connecting rod 3 is provided below the first inner tooth member 4, and a second rocker 8 is provided inside the main frame 1. The second rocker 8 is hinged to the first rocker 5. Specifically, the second rocker 8 can be hinged to the first plate body 51 of the first rocker 5, or the second rocker 8 can be hinged to the second plate body 52 of the first rocker 5. The second rocker 8 is pushed by the multi-function pedal 6 to swing and cooperate with the second inner tooth member 7.
[0038] In this embodiment, when the second rocker 8 is hinged to the second plate body 52 of the first rocker 5: two spaced connecting plates 523 are provided at the lower part of the second plate body 52, and through holes 524 are provided on the connecting plates 523; the second rocker 8 is provided with a groove 81 for the two connecting plates 523 to penetrate; holes 82 are provided on the walls on both sides of the groove 81; a first pivot member 9 is passed between the through hole 524 and the hole 82; the second plate body 52 of the first rocker 5 and the second rocker 8 are hinged to the main frame 1 through the first pivot member 9, thereby realizing the hinge connection of the first rocker, the second rocker and the main frame.
[0039] In this embodiment, another improvement over the three-speed caster disclosed in Chinese Patent Publication No. CN116039288B is that: a circle of first bevel teeth 71 is provided at the bottom of the second inner tooth member 7, and the circle of first bevel teeth 71 is coaxially arranged with the second inner tooth member 7, and the second bevel teeth 83 distributed in a circular arc are provided at the top of one end of the second rocker 8 close to the second inner tooth member 7, and when the second rocker 8 swings, the second bevel teeth 83 mesh with or separate from the first bevel teeth 71, that is: the circle of bevel teeth in this embodiment corresponds to the multiple second grooves on the second inner tooth member in the three-speed caster disclosed in Chinese Patent Publication No. CN116039288B, and the arc-shaped second bevel teeth correspond to the second clamping part of the second rocker in the three-speed caster disclosed in Chinese Patent Publication No. CN116039288B. By providing the first bevel teeth and the second bevel teeth, when the second rocker swings driven by the multi-functional pedal, the second bevel teeth can mesh with the first bevel teeth faster and more smoothly, so as to achieve smoother positioning.
[0040] In this embodiment, two symmetrically distributed positioning circular holes 42 are provided on the first inner tooth part 4, and the positioning circular holes are vertically penetrated; two symmetrically distributed positioning columns 72 are provided on the top of the second inner tooth part 7, and the two positioning columns 72 correspond to the positions of the two positioning circular holes 42, and the positioning columns pass through the positioning circular holes, so as to realize the positioning and matching of the first inner tooth part and the second inner tooth part.
[0041] In this embodiment, a clamping block for clamping into the groove of the first inner tooth member 4 is disposed at one end of the second plate 52 away from the hinge, and the clamping block is the clamping portion 54 of the second plate 52. Specifically: in order to ensure the structural strength of the clamping, the clamping block is made of metal material, and the clamping block made of metal material has better structural strength; the first plate and the second plate are both injection molded by plastic, and the clamping block and the second plate are integrally injection molded.
[0042] It should be noted that the utility model is improved on the basis of a multi-pedal controlled caster and its use method disclosed in Chinese Patent Publication No. CN116039288B. The specific improvement is that the first seesaw is designed as a split structure, and the second seesaw and the second inner tooth member are matched with helical teeth. The split structure of the first seesaw reduces the structural rigidity of the first seesaw, making the multi-functional pedal more labor-saving and smoother to step on; and the second seesaw and the second inner tooth member are matched with helical teeth, which can make the second seesaw swing into position more smoothly and facilitate better positioning. As for the structure of the first inner tooth member, the second inner tooth member, the second seesaw, the connecting rod, the main bracket, the wheel member and other components, and the related connection relationship between the components, and the specific use method of the caster, they are the same as the multi-pedal controlled caster and its use method disclosed in Chinese Patent Publication No. CN116039288B, and will not be repeated here.
[0043] If the present invention discloses or involves components or structures that are fixedly connected to each other, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (for example, connection using bolts or screws), and can also be understood as: a non-detachable fixed connection (for example, riveting, welding). Of course, the mutual fixed connection can also be replaced by an integrated structure (for example, manufactured by one-piece molding using a casting process) (except where it is obviously impossible to use an one-piece molding process).
[0044] In addition, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in the above utility model include states or shapes that are approximate, similar or close thereto.
[0045] Any component provided by the utility model can be assembled from multiple separate components, or can be a separate component manufactured by an integrated forming process.
[0046] 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 preferred embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the utility model can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the utility model, which should be included in the scope of the technical solution for protection of the utility model.
Claims
1. A three-speed caster with a novel brake structure, comprising a main frame with a wheel member, a connecting rod with one end extending into the main frame and rotatably connected to the main frame, a first inner tooth member fixedly mounted on the connecting rod, a first rocker plate hinged inside the main frame, the first rocker plate is pushed by a multifunctional pedal to swing and match with the first inner tooth member, characterized in that: The first rocker plate includes a first plate body having a receiving portion for abutting against a pushing portion of a multi-functional pedal, a second plate body having a clamping portion for clamping into a groove of a first internal tooth member, and an elastic member. The first plate body and the second plate body are hingedly connected by a hinge, and the elastic member is sleeved on the outside of the hinge, with both ends of the elastic member respectively abutting against the first plate body and the second plate body.
2. A three-speed caster with a novel brake structure according to claim 1, characterized in that: A hinge slot is provided at one end of the first plate body away from the abutting portion, and two hinge plates are provided at one end of the second plate body away from the clamping portion, and the hinge plates extend into the hinge slot, and hinge through holes are provided on the two hinge plates and the two side walls of the hinge slot; the hinge part is a hinge shaft, and the hinge shaft passes through the hinge through holes of the hinge plates and the side walls of the hinge slot to realize the hinge connection between the first plate body and the second plate body.
3. A three-speed caster with a novel brake structure according to claim 2, characterized in that: The elastic member is a torsion spring arranged between the two hinge plates. The torsion spring includes a sleeve portion sleeved on the outside of the hinge shaft. Limited abutment portions are respectively extended from both ends of the sleeve portion. The limited abutment portions at both ends of the sleeve portion abut against the first plate body and the second plate body respectively.
4. The three-speed caster with a novel brake structure according to claim 2 is characterized in that: A supporting step for supporting the first plate body is arranged below the hinged plate.
5. The three-speed caster with a novel brake structure according to claim 1 is characterized in that: A second inner tooth part fixedly mounted on a connecting rod is provided below the first inner tooth part, a second rocker is provided inside the main frame, the second rocker is hinged to the first plate body or the second plate body, and the second rocker is pushed by a multi-functional pedal to swing and rotate to cooperate with the second inner tooth part.
6. The three-speed caster with a novel brake structure according to claim 5, characterized in that: Two spaced-apart connecting plates are provided at the lower part of the second plate body, through holes are provided on the connecting plates, grooves are provided on the second rocker for the two connecting plates to pass through, holes are provided on the walls on both sides of the grooves, a first pivot member is passed between the through holes and the holes, and the second plate body of the first rocker and the second rocker are hinged to the main support through the first pivot member.
7. The three-speed caster with a novel brake structure according to claim 5, characterized in that: A circle of first bevel teeth is coaxially arranged at the bottom of the second inner tooth part, and second bevel teeth distributed in an arc shape are arranged at the top of one end of the second rocker close to the second inner tooth part. When the second rocker swings, the second bevel teeth engage or disengage with the first bevel teeth.
8. The three-speed caster with a novel brake structure according to claim 5, characterized in that: The first inner tooth part is provided with two symmetrically distributed positioning circular holes, and the positioning circular holes are vertically penetrated; the top of the second inner tooth part is provided with two symmetrically distributed positioning columns, the two positioning columns correspond to the positions of the two positioning circular holes, and the positioning columns penetrate the positioning circular holes.
9. The three-speed caster with a novel brake structure according to claim 1, characterized in that: A clamping block for clamping into the groove of the first inner tooth member is disposed at one end of the second plate body away from the hinge member, and the clamping block is a clamping portion of the second plate body.
10. The three-speed caster with a novel brake structure according to claim 9, characterized in that: The clamping block is made of metal material, the first plate body and the second plate body are both made of plastic injection molding, and the clamping block and the second plate body are integrally injection molded.