CN2499252Y

CN2499252Y - Improved castor

Info

Publication number: CN2499252Y
Application number: CN 01233578
Authority: CN
Inventors: 朱惠雄
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-08-21
Filing date: 2001-08-21
Publication date: 2002-07-10
Anticipated expiration: 2011-08-21

Abstract

An improved castor comprises a wheel carrier, the upper concave of which is provided with a perforative pin joint hole, wherein the left side and the right side of the pin joint hole are provided with two rotating wheels correspondingly; the front side of the wheel carrier is provided with a throw member, the terminal of which is provided with a top connection part, wherein the side of the top connection part is provided with a stop component held by a first flexible component; therefore the stop component can play the role of relative stopping for the ring gear at the inner side of the two rotating wheels. The underside of the throw member is provided with a second stop component in horizontal wandering drive mode. The front end of the second stop component is provided with a top holding part, while the rear end of the second stop component is folded upward to form a wall. The downside of the throw member above the second stop component extends downward and is provided with a striking part, the underside of which is provided with a second flexible component to provide horizontal restoration spring. The end of the rotating wheel corresponding to the front end of the second stop component is axially fixed with a stop ring, the external circumference of which is at least provided with a group of concave parts corresponding to the two ends of the diameter to provide butt stop for the front end of the second stop component. The utility model has the advantages of easy operation and less possibility of malfunction.

Description

Improved caster

The technical field is as follows:

the utility model relates to a truckle especially relates to a modified truckle with convenient operation is difficult for producing the trouble.

Secondly, background art:

the conventional caster structure, as shown in fig. 1, is a wheel structure that can be installed on a table, a chair, a scooter, etc., and includes a wheel frame I, on which a through hole IA is concavely provided, two sides of the through hole IA are involutory and pivoted with a rotating wheel 2, the circumference of the inner diameter of the rotating wheel 2 is concavely provided with a plurality of ring tooth parts 2A, the rear side of the wheel frame I is pivoted with a rotating shaft 3 in a free pivoting manner, the bottom end of the rotating shaft 3 is fixedly provided with a gear 4; the front side of the wheel frame I is pivoted with a vertically movable part 5, the lower part of the wheel frame I is pivoted with a braking element 6, the braking element 6 is punched into a V shape by a metal plate, the middle part of the braking element is provided with a pivot 6A, and the left end side and the right end side of the braking element can swing with the pivot of the pivot center for lever motion. The left end is bent upward to form a convex embedding part 7 which is separated from the left and the right to be embedded and stopped relative to the diameter two side teeth of the gear 4, the right end is bent to form a supporting part 8, the back side is integrally stamped with an elastic sheet part 9, and a spring 9A is matched to provide lateral restoring elastic force for the supporting part 8. When the pulling member 5 is pulled upwards, the supporting portion 8 is pushed downwards by the bottom side to compress the strong piece portion 9, and when the pulling member 5 is pulled downwards, the pressing force on the supporting portion 8 is released, so that the elastic piece portion 9 is pushed upwards by the return force of the elastic piece portion 9 and the like to be engaged with the annular tooth portion 2A of the inner diameter of the two side rotating wheels 2 for positioning and stopping. In operation, since the stopping element 6 is pushed and driven by the force of the lever fulcrum, metal fatigue deformation often occurs, so that the embedded part 7 is not easy to align with the gear 4. Further, since the compression wheel base of the spring portion 9 is too small, the return tension is often unstable, and thus the braking effect on the gear 4 of the rotary wheel 2 and the rotary shaft 3 is poor, and a failure often occurs, and the restraining element 6 is easily broken and damaged due to metal fatigue caused by repeated operation of long-distance offset pressing. In addition, in general, a wheelchair or other metal chairs equipped with the casters often have an electric shock feeling when a person approaches and sits down. Particularly, in the season of particularly dry air, the hands of the human body are easy to generate static electricity when contacting metal objects, so that the human body is electrically shocked and immediately reflected to nerves, and the feeling of numbness and stimulation is very daunting. It is important to note that the wheelchair-bound people are all people who are not mobile, and when they approach the wheelchair, they are suddenly electrified, and they are likely to fall down due to sudden triggering terrorism, which is quite dangerous, so that the electrostatic interference may be regarded as a problem which is not thick and serious in the ordinary people, but they are hidden with unpredictable risks for the sick or physically mobile people.

Thirdly, the invention content:

the utility model aims to provide an improved caster, the action of its brake locking really has convenient operation, is difficult for producing the advantage of trouble.

Another object of the present invention is to provide an improved caster, which can effectively avoid the human body from being interfered by static electricity, thereby ensuring the safety of users.

The purpose of the utility model is realized by the following technical scheme.

An improved caster comprises a wheel frame, wherein a through pin joint hole is concavely arranged on the wheel frame, two rotating wheels are correspondingly pivoted at the left end and the right end of the pin joint hole, and a plurality of annular tooth parts are concavely arranged on the inner side circumference of each rotating wheel; the rear side of the wheel carrier is pivoted with a rotating shaft in a free shaft rotating mode for being upwards connected to articles such as tables, chairs, beds and the like, and the front side of the wheel carrier is pivoted with a wrenching piece in a pivot wrenching mode at the upper angle and the lower angle; the device is characterized in that the terminal of the trip piece is provided with a butting part, the lateral butting part is pivoted with a stopping element propped by a first elastic element to be driven and controlled by the butting part and play a relative stopping role on the ring tooth part at the inner side of the two rotating wheels, wherein a second stopping element is pivoted below the trip piece in a horizontal walking driving and controlling mode, the front end of the second stopping element is provided with a butting part, and the rear end of the second stopping element is upwards turned to form a retaining wall; the bottom side of the upper pulling part extends downwards to form a protruding toggle part, the lower part of the upper pulling part is pivoted with a second elastic element to provide horizontal restoring elasticity for the second stopping element, the end of the rotating shaft is axially provided with a stopping ring relative to the front end of the second stopping element, and the outer diameter circumference of the stopping ring is at least concavely provided with a group of concave parts with two corresponding diameters for the front end of the second stopping element to be abutted and stopped.

The object of the invention is further achieved by the following technical measures.

In an embodiment, the bottom side of the second stopping element extends downward to form a protruding limiting portion for the elastic element to horizontally stop compression.

In the above improved caster, the second restraining element and the second resilient element are restrained by Jiong clips mounted below the pivot of the two wheels.

In the above-mentioned improved caster, a conductive plate is additionally installed at the axial bottom end of the rotating shaft of the wheel frame, and a conductive layer is additionally installed on the end surfaces of the inner sides of the two rotating wheels and the outer diameter annular surface contacting with the ground, so that the conductive plate can be tightly abutted to connect the static electricity to the ground after the combination.

In the above-mentioned improved caster, two sides of the conductive sheet extend outwards and upwards to form a contact portion, and a control point is protruded outwards in the middle of the contact portion.

The utility model discloses a brake locking action has convenient operation really, is difficult for producing the advantage of trouble, and can effectively avoid the human body by electrostatic interference, ensures user's safety.

Fourthly, explanation of the attached drawings:

fig. 1 is a schematic view of a conventional caster structure.

Fig. 2 is an exploded perspective view of a preferred embodiment of the present invention.

Fig. 3 is a schematic combined plan view of a preferred embodiment of the present invention.

Fig. 4 is a schematic view of the braking operation of the present invention.

Fig. 5 is a schematic view of the caster linear positioning brake of the present invention.

Fig. 6 is a schematic perspective view of the wheel frame with the conducting strip according to the present invention.

Fig. 7 is a schematic plan view of the assembly of the wheel frame with the conducting strips.

The fifth embodiment is as follows:

first, referring to fig. 2 to 7, the present invention includes a wheel frame 10, two wheels 20, a shaft 30, a trip member 40, a first stopping element 50, a second stopping element 60, and a conducting strip 70; wherein,

the wheel frame 10, as shown in fig. 2, is provided with a pivot hole II penetrating through the left and right end sides for pivoting two wheels 20, and the rear side thereof is provided with a column-shaped shaft hole seat 12 for pivoting a rotating shaft 30; a slot hole 13 is concavely arranged on the front side, an accommodating space 14 is formed below the slot hole 13, a pivot hole 14A is concavely arranged in the slot hole for the pivot to erect a trip piece 40, and an accommodating groove 15 is concavely arranged on the lateral side of the accommodating space 14 for accommodating and positioning a first stopping element 50; the lower portion of the pivot hole 11 is recessed to form a mounting space 16 for mounting a second restraining member 60.

The wheel 20 is symmetrically pivoted on both sides of the wheel frame 10, and has a plurality of ring teeth 21 respectively recessed in the inner diameters of the opposite sides, and a shaft hole 22 recessed in the center thereof, which is pivotally connected to the pivot hole 11 by a spindle 24 having a head portion in tandem connection with two shaft bodies 23. The end of the mandrel 24 is recessed with a screw hole 241 for locking and fixing with a washer 242 and a screw 243.

The rotating shaft 30 is a circular rod body, and is disposed through the center hole of the shaft hole seat 12 of the wheel frame 10, the top end thereof has an external thread 31 for screwing to a predetermined target object such as the bottom side of a cart, the bottom side of the external thread 31 extends radially to form a blocking portion 32 for blocking and limiting on the top end side of the shaft hole seat 12, the axial bottom section thereof is contracted to form a hexagonal column-shaped driving portion 33, which is axially sleeved and fixed with a stopping ring 34, the center of the stopping ring 34 is also provided with a hexagonal fixing hole 341 in a recessed manner, and the outer diameter circumference thereof is at least provided with a recessed portion 342 corresponding to the two ends of the shaft diameter thereof respectively in a recessed manner for the insertion and the stopping of the second stopping element 60.

The wrench 40 includes a wrench portion 41 for manual operation, and a plate 42 extending downward from the bottom side of the wrench portion 41, the plate 42 has a top 421 at the end, a pin hole 422 is recessed above the top to cooperate with a positioning pin 423 to be pivotally positioned in the pivot hole 14A of the wheel frame 10, so as to be inserted into the wrench 40 received in the slot hole 13, and the pin can be angularly offset from the pivot center, and the lower side of the plate 42 extends downward to form a cantilever-shaped toggle portion 424.

The first stopping element 50 is formed by metal stamping to form an Jiong-shaped seat, the middle of which is a pressing surface 51, and the two sides of which are bent to form a corresponding resisting end 52 corresponding to the tooth space of the ring tooth portion 21 of the rotating wheel 20, which is pressed below the pressing portion 421 of the trigger 40 to receive downward pressing force during the deflection thereof, and the bottom side of the pressing surface 51 is pressed by a spring 53 disposed in the receiving slot 15 to provide axial restoring elastic force. Thereby, through the pivot offset operation of the trip 40, the pushing surface 51 is pressed by the top connection part 421 to be disengaged from the annular tooth part 21 of the rotating wheel 20; the original abutting portion 421 is released from being pressed by the reverse biasing operation of the trigger 40, and the contact ends 52 on both sides of the first check member 50 are pushed upward by the restoring force of the compression spring 53 to engage with the corresponding ring gear portion 21, so as to check the rotation of the rotary wheel 20.

The second restraining element 60 is formed by stamping metal, is horizontally disposed in the mounting space 16 below the pivot hole II of the wheel frame 10, and includes a contact end 61 with a horizontal front end in a contracted shape, which corresponds to the recess 342 of the restraining ring 34; the rear end thereof is bent upward to form a retaining wall 62 for the toggle part 424 to lean against during the pivotal displacement of the toggle 40; the bottom side of the middle section is punched to form a limiting part 63 protruding downwards, a spring 64 is horizontally arranged on the side of the limiting part 63 to provide lateral horizontal return elastic force, an Jiong-shaped clamping seat 65 is used for upwards containing and limiting, the Jiong-shaped clamping seat 65 is provided with a supporting bottom 651 and two side upright wall surfaces 652, the center of the top side of the upright wall surface 652 is concavely provided with a circular notch 653 relative to the circular diameter of the pin-joint hole II of the wheel frame 10, and the upright wall surfaces 652 are matched with screws 655 to be screwed and fixed on the wheel frame 10, so that the second stopping element 60 is limited to move on the horizontal line all the time, and the engagement or disengagement of the front end abutting end 61 on the concave part 342 of the stopping ring 34 is really carried out.

By the above-mentioned combination structure, as shown in fig. 3, the caster of the present invention is intended to move under normal conditions, including the rotation of the wheel 20, which can freely rotate around the forward/backward moving shaft, and can rotate 360 degrees around the rotating shaft 30, as shown in fig. 3, the pulling member 40 is pulled upward to the highest position, the top connection portion 421 at the bottom side of the pulling member 40 downwardly presses the top pressing surface 51 of the first stopping element 50, so that the protruding resisting ends 52 at the two sides are downwardly separated from the ring gear portion 21, and the two side wheels 20 can freely rotate without hindrance, wherein the spring 53 is in a compressed state. On the other hand, since the pulling member 40 is pulled upward to make the pulling portion 424 in the form of cantilever at the lower end swing downward around the center of the pivot pin hole 422, the retaining wall 62 abutting against the pulling portion 424 will bear a rearward horizontal pulling force, as shown by the arrow direction in the figure, and at the same time, the second stopping member 60 is pushed horizontally backward, and the abutting end 61 at the front end thereof is relatively separated from the concave portion 342 of the original engagement stopping ring 34, so that the whole caster can freely rotate 360 degrees around the center of the rotating shaft 30, and thus the object fixed thereon, such as a table, a chair, a cart, etc., can freely walk.

As shown in fig. 4, when the caster is going to rest after traveling to a destination, the trip member 40 can be tripped downward to the lowest point, so that the top connection portion 421 of the trip member 40 swings upward to disengage from the pressing of the top pressing surface 51 of the first stopping member 50, and therefore the spring 52, which is originally compressed at the bottom, pushes up the whole first stopping member 50 by its restoring elastic force, so that the contact ends 52 at the two sides of the upper end of the first stopping member 50 are pushed into the ring gear portion 21 of the inner diameter of the two rotating wheels 20 to be engaged and positioned relatively, and the rotating wheels 20 cannot continue to rotate. Meanwhile, since the toggle portion 424 is disengaged from the abutment against the retaining wall 62 as the toggle member 40 is moved upward, the spring 64 horizontally disposed at the front is compressed to generate a return spring force, which quickly urges the second stopping member 60 horizontally toward the stopping ring 34, and the rotating wheel 20 rotates slightly left and right therebetween, so that the recess 342 of the outer diameter of the stopping ring 34 is immediately engaged and positioned with the abutment end 61 of the front end thereof, thereby ensuring the braking operation of the rotating wheel 20 in a linear fixed direction, as shown in fig. 5, wherein the stopping ring 34 may also be provided with a plurality of recesses on the entire outer diameter circumference as required, so as to achieve a faster positioning effect.

Referring to fig. 6 and 7, in order to effectively solve the problem of electrostatic interference, a conductive plate 70 may be additionally installed at the axial bottom end of the rotating shaft 30 of the wheel frame 10, as shown in fig. 6. The conductive sheet 70 has two outwardly and upwardly extending contact portions 71, and a control point 72 is disposed between the contact portions. Meanwhile, a conductive layer 20a is disposed on the inner end surface of the two wheels 20 and the outer annular surface contacting the ground, so as to tightly contact the contact portions 71 at the two sides of the conductive sheet 70 at the positions of the points 72 after assembly, as shown in fig. 7, thereby connecting the static electricity to the ground. By the above-mentioned combination structure, the conductive layers 20a disposed on the inner peripheral surfaces of the two sides of the wheel 20 properly press and abut against the contact portions 71 formed on the two sides of the conductive sheet 70 protruding outward below the rotating shaft 30, and since the conductive layers 20a fixed on the wheel 20 are made of conductive metal and the outer periphery thereof contacts with the ground, the conductive layers 20a also contact with the ground to form a direct grounding state as the wheel 20 rolls and moves on the ground. Therefore, after the legs of the wheelchair legs or bed legs made of metal pipes and other furniture made of metal steel are directly locked with the wheel frame 10, if static electricity is generated, the conductive sheet 70 of the metal shaft 30 is connected to the conductive layer 20a of the wheel 20 through the contact parts 71 at the two sides and the points 72, and touches the ground, so as to completely avoid the human body from being interfered by the static electricity, and further prevent the accident danger caused by the shock of electric shock.

To sum up, the utility model discloses break through traditional technical thought, have the space integrated configuration of innovation, not only make the operation of truckle brake locking more really, convenient, can effectively avoid the human body to be disturbed by static simultaneously again, compare with the conventional technique, improve the practicality.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications, equivalent changes and modifications made by the technical spirit of the present invention to the above embodiments still fall within the scope of the technical solution of the present invention.

Claims

1. An improved caster comprises a wheel frame, wherein a through pin joint hole is concavely arranged on the wheel frame, two rotating wheels are correspondingly pivoted at the left end and the right end of the pin joint hole, and a plurality of annular tooth parts are concavely arranged on the inner side circumference of each rotating wheel; the rear side of the wheel carrier is pivoted with a rotating shaft in a free shaft rotating mode for being upwards connected to articles such as tables, chairs, beds and the like, and the front side of the wheel carrier is pivoted with a wrenching piece in a pivot wrenching mode at the upper angle and the lower angle; the device is characterized in that the terminal of the trip piece is provided with a butting part, the lateral butting part is pivoted with a stopping element propped by a first elastic element to receive the driving control of the butting part, wherein, a second stopping element is pivoted below the trip piece in a horizontal walking driving control mode, the front end of the second stopping element is provided with a butting part, and the rear end of the second stopping element is upwards bent to form a retaining wall; the bottom side of the upper pulling part extends downwards to form a protruding shifting part, the lower part of the upper pulling part is pivoted with a second elastic element, the tail end of the rotating shaft is axially provided with a stopping ring corresponding to the front end of the second stopping element, and the outer diameter circumference of the stopping ring is at least concavely provided with a group of concave parts with two ends corresponding to the diameter for the front end of the second stopping element to be abutted and braked.

2. The improved caster as defined in claim 1, wherein said second inhibiting member has a limiting portion integrally formed with a downwardly extending bottom side thereof for horizontally resisting compression of said resilient member.

3. The improved caster of claim 1, wherein said second deterrent element and second resilient element are restrained in position by Jiong clips mounted below the pivot of said wheel.

4. The improved caster as claimed in claim 1, wherein the axial bottom of the wheel frame is provided with a conductive plate, and the inner end surfaces of the two wheels and the outer annular surface contacting the ground are provided with a conductive layer which can tightly abut against the conductive plate after being assembled.

5. The improved caster as claimed in claim 1, wherein said conductive strip has outwardly and upwardly extending contact portions on opposite sides thereof, said contact portions having a retaining point projecting outwardly therefrom.