JP3165888U - Brake device - Google Patents

Abstract

Provided is a brake device that has a simple structure, is easy to assemble, and quickly responds to braking of a wheel when the speed of the wheel exceeds a predetermined speed. An axle to which wheels are attached, a frame to which the axle is attached, and a rotating pin 32 fixed to the axle and protruding laterally. A braking ball 30 slidably inserted into the rotating pin 32, a braking member 26 attached to the axle and containing the rotating pin 32 and the braking ball 30, and a stopper member for stopping rotation of the braking member 26. Prepare. A space 26a is formed in the braking member 26 so as to rotatably accommodate the rotation pin 32 and the braking ball 30. When the rotation of the axle becomes equal to or more than a predetermined value, the braking ball 30 is fixed to a peripheral portion in the space 26a. . The rotation of the braking member 26 is limited by the stopper member, the rotation of the axle is stopped, and the brake is applied to the rear wheel. [Selection] Figure 2

Description

  The present invention relates to a brake device attached to a moving vehicle such as a wheelchair or a handcart.

  Conventionally, elderly and disabled people who are physically disabled and unstable in walking often use handcarts to assist in walking and to carry luggage. People who are difficult to walk due to illness or injury may move using a wheelchair. Such wheelbarrows and wheelchairs are difficult to operate by a person with a handicapped hand or foot, and sometimes run at an excessive speed on a downhill or the like.

  As disclosed in Patent Document 1, a wheel control device has been proposed to prevent such excessive traveling on a downhill. In this wheel control device, a rotating drum is integrally fixed at the center of the wheel, and a large number of rotating magnets, which are permanent magnets, are fixed along the circumferential direction on the inner peripheral surface of the rotating drum. A fixed disk is disposed on the inner peripheral side of the rotating drum, and a brake is attached to the fixed disk. The brake is provided with a swing piece, and a fixed magnet, which is a permanent magnet close to the rotary magnet of the rotary drum, is provided at the tip thereof. As the wheels rotate at a high speed above a certain level, the oscillating piece is vigorously oscillated by the magnetic force when a large number of rotating magnets continuously contact and separate from the fixed magnet, and the small piston connected to the oscillating piece is moved to the small cylinder The large piston is moved forward by feeding the compressed air generated thereby into the large cylinder, and the wheel is controlled or stopped using the force.

  Further, as disclosed in Patent Document 2, a brake device attached to a wheel has also been proposed. The brake device includes an axle to which wheels are attached, a frame to which the axle is attached, a first pipe member that extends upward from the vicinity of the axle and has an upper end bent and directed downward, and the first pipe. A support fitting for attaching the member to the frame body, and a second pipe member that is connected to the front end portion of the first pipe member without any resistance and is swingable through a hollow joint member and hangs vertically. The second pipe member is attached to an end of the second pipe member opposite to the joint member, and has a bottom surface perpendicular to the longitudinal direction of the second pipe member. A case that is kept parallel to the bottom surface and is rotatable about the center, and is formed radially on the top surface of the disc on the periphery of the disc. Incline so as to approach upward as you approach A semi-cylindrical guide member that opens upward, a spherical body such as a steel ball that is placed inside the guide member and is movable along the longitudinal direction of the guide member, and the guide member in the case A friction plate that is attached to the upper side and has a suitable flexibility and that comes into close contact when the sphere approaches the periphery of the disc is provided, and the center of the disc penetrates the case. A flexible rotating shaft such as a coiled wire that is inserted into the second pipe member and passed through the joint member through the joint member and drawn out in the vicinity of the axle, The brake device is provided with a bevel gear or the like that transmits rotation to the axle at an end of the rotation shaft. In this brake device, when the rear wheel rotates, the axle rotates around the shaft, and the rotation of the axle is transmitted to the rotating shaft through the bevel gear, and the disc is moved in the horizontal direction along with the rotation of the rotating shaft. As the disc rotates, the sphere moves to the peripheral edge of the disc by centrifugal force, and when the rotation exceeds a certain speed, the guide member rises and comes into contact with the friction plate. Friction is generated and rotation is stopped, and the rear wheel is braked.

JP 2003-35328 A JP 2009-250413 A

  In the case of the wheel control device disclosed in Patent Document 1 of the above background art, the large piston is moved forward by the compressed air generated by the swinging of the swinging piece due to the high-speed rotation of the wheel to brake or stop the wheel. In some cases, it takes a long time to brake or stop, resulting in a dangerous situation such as poor response and collision. In addition, the structure is complicated and expensive, and it is difficult to adjust the braking force.

  Also, the brake device disclosed in Patent Document 2 has a complicated rotation transmission path and other structures, and can not be easily attached to an existing handcart, and the cost of the device is also high. .

  The present invention has been made in view of the above-mentioned problems of the background art, has a simple structure, is easy to assemble, and brakes that quickly respond and brake the wheel when the wheel rotation exceeds a set value. The purpose is to provide.

  The present invention relates to an axle having wheels attached thereto, a frame to which the axle is attached, a rotating pin fixed to the axle and projecting laterally, and a brake slidably inserted into the rotating pin. A sphere, a braking member attached to the axle and containing the rotating pin and the braking ball, and stopper means for stopping the rotation of the braking member, wherein the rotating pin and the braking ball are rotated in the braking member. A space portion that can be accommodated is formed, and when the rotation of the axle exceeds a certain level, the braking ball is fixed to a peripheral portion in the space portion, and the rotation of the rotation pin is prevented in the space portion, and the braking member Is also limited by the stopper means, and the rotation of the axle is stopped, and the rear wheel is braked.

  The braking member is formed of a pair of columnar members, and the pair of members are provided with Mt. Fuji-like space portions that extend symmetrically from the center to the periphery. Furthermore, a braking recess is provided at one location around the space where the braking ball is fitted.

  The stopper means comprises a stopper piece which can be freely projected and retracted, and a stopper pin protrudingly provided on the braking member, and when the brake operation is not performed, the stopper piece is retracted to deactivate the brake by the braking member. It can be said that.

  The brake device of this device is attached to a wheelchair or a cart such as a handcart. With a simple structure, the brake is applied quickly and automatically when the speed exceeds a certain level. it can. Thereby, it can be set as a wheelchair or a handcart that can be used with peace of mind for a disabled person such as an elderly person or a person with a disability.

It is a partial front view which shows the attachment state of the brake device of one Embodiment of this invention. It is a longitudinal cross-sectional view of the brake device of this embodiment. It is a decomposition | disassembly longitudinal cross-sectional view of the braking member of the brake device of this embodiment. It is a side view of the braking member of the brake device of this embodiment. It is a front view of the braking member of the brake device of this embodiment. It is a perspective view of the handcart which attached the brake device of this embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIGS. 1-6 shows one Embodiment of this invention, The brake device 10 of this embodiment is attached to the handcart 11. The handcart 11 has a frame 12 that constitutes a seat, a handle, an armrest, and the like, and a pair of front wheels 14 that are positioned on the front side in the traveling direction are attached to the axle 16 at the lower part of the frame 12, On the side, a pair of rear wheels 18 are attached to the axle 20.

  A handle 22 is formed above the rear wheel 18 of the frame 12, and a brake lever 24 is provided on the handle 22. The brake lever 24 is interlocked with a conventional brake device (not shown) attached to the rear wheel 18 and is omitted here. The axle 20 of the rear wheel 18 is further provided with the brake device 10 of the present invention.

  In the brake device 10 of this embodiment, a pair of circular braking members 26 made of resin or metal are inserted through the axle 20 and are rotatably provided. A cylindrical bearing member 28 through which the axle 18 is inserted is fixed to the columnar central portion of the braking member 26, and the axle 18 is rotatably inserted. Around the bearing member 28 of the pair of braking members 26, a space portion 26a is formed in a symmetric shape in the shape of Mt. Fuji. Further, a spherical braking recess 26b into which a later-described braking ball 30 is fitted is symmetrically formed in one space portion 26a near the side peripheral surface of the braking member 26 to form a substantially hemisphere into which the braking ball 30 is fitted. It is provided to do.

  A rotation pin 32 that passes through the axle 18 and rotates integrally is fixed to a portion of the axle 18 where the braking member 26 is located. The rotation pin 32 protrudes and penetrates symmetrically with respect to the axle 18 for balancing, and the braking ball 30 is slidably inserted into the rotation pin 32 on one side. A through hole (not shown) is formed in the braking ball 30, and a rotating pin is inserted into the through hole, and the braking ball 30 is provided so as to be freely movable along the rotating pin 32.

  In a state where the braking ball 30 is inserted into the rotating pin 32, the pair of braking members 26 are inserted into the axle 18, and the rotating pin 32 is accommodated in the space portion 26a of the braking member 26. The braking member 26 is not illustrated. They are connected together by bolts or the like. In this state, the braking ball 32 slides downward due to gravity. Here, the center side of the braking member 26 of the bearing member 28 is opposed to each other with a clearance 28a that allows the rotation pin 32 to rotate within the space 26a without contacting each other. Further, a stopper pin 36, which will be described later, protrudes in the vicinity of the portion where the braking recess 26b is located on the side peripheral surface of the braking member 26.

  Further, as shown in FIG. 1, a stopper member 34 is provided at a position facing the axle 12 and the braking member 26 of the frame body 12. The stopper member 34 is provided with a stopper piece 38 provided so as to protrude and retract at a contact position and a retracted position with respect to a stopper pin 36 protruding from the peripheral surface of the braking member 26. When the stopper pin 36 is positioned above the axle 20, the stopper member 34 is disposed so as to contact the stopper piece 34. The stopper piece 38 is protruded and retracted through an operation wire 40 by an operation lever (not shown) provided on the handle 22.

  Next, the operation and action of the brake device 10 of this embodiment will be described. First, when the handcart 11 travels at a normal speed by walking or the like, the stopper piece 38 is set to the protruding position by an operation lever (not shown). When the rear wheel 18 is rotated by walking, the axle 20 is rotated, and the rotation pin 32 is also rotated in the space portion 26a. At this time, the braking ball 30 inserted through the rotation pin 32 falls downward due to gravity, and when the rotation pin 32 is positioned upward, moves to the outside of the axle 20 due to centrifugal force. However, at the speed of walking, the braking ball 30 is not strongly pushed outward and slides on the outer peripheral side of the space portion 26a. At this time, the braking member 26 also tries to rotate due to sliding friction between the axle 20 and the bearing member 28, but the stopper pin 36 comes into contact with the stopper member 34, and further rotation of the braking member 26 is prevented.

  When the movement speed suddenly increases during walking or the like, the rotation of the axle 20 increases, so that the rotation pin 32 also rotates at a high speed, and the centrifugal force acts so that the braking ball 30 is pushed more strongly to the periphery. . Due to this centrifugal force, the braking ball 30 is pushed to the periphery of the space portion 26a, and when the rotating pin 32 is positioned upward, the braking ball 30 enters the braking recess 26b. Thereby, the rotation pin 32 and the braking member 26 are integrated, and the rotation pin 32 is fixed to the braking member. Since the stopper pin 36 is in contact with the stopper piece 38 of the stopper member 34, the rotation of the braking member 26 is also restricted, so that the rotation of the axle 20 is stopped. By this operation, the handcart 11 stops quickly when the speed exceeds a certain speed. In addition, from sudden runaway to braking, the braking ball 30 slides on the inner wall surface of the outer peripheral portion in the space portion 26a and engages with the braking recess 26b so that braking is applied. There is an elapsed time until operation, and shock due to sudden braking is reduced. Note that the brake device 10 functions in the same manner only when the axle 20 is rotated in the reverse direction even when the handcart 11 is moved backward.

  Next, when for some reason fast traveling is required, the stopper piece 38 of the stopper member 34 is moved to the retracted position by an operation lever (not shown) so that the stopper pin 36 does not contact the stopper piece 38. When the frame body 12 is positioned within the movement locus of the stopper pin 36, a notch 12a as shown in the figure is formed in that portion so as not to hinder the rotation of the stopper pin 38. By setting the stopper piece 38 to the retracted position, the rear wheel 18 is rotated at a high speed by the high speed movement, the axle 20 is also rotated at a high speed, the rotating pin 32 is rotated at a high speed, and the braking ball 30 is moved to the outer peripheral side. 26 and the rotating pin 32 are connected, and even if the braking member 26 rotates together with the axle 20, the stopper pin 36 does not come into contact with the stopper piece 38 and can rotate freely. High speed movement is possible.

  According to the brake device 10 of this embodiment, the wheelbarrow 11 can be reliably prevented from running out of control with a simple structure. For example, even if the handcart 11 runs down on a downhill, the brake is automatically applied as soon as the rotation of the rear wheel 18 exceeds a certain level, so that it is possible to eliminate injuries and damage to articles due to an accident. The braking speed of the brake device 10 can be easily adjusted by the size of the braking ball 30, the shape of the space portion 26a, and the like. Can be set.

  In addition, the brake device of this invention is not limited to the said embodiment, Members, such as a shape of a space part and a stopper pin, can be changed suitably.

DESCRIPTION OF SYMBOLS 10 Brake apparatus 11 Handcart 12 Frame 14 Front wheel 16, 20 Axle 18 Rear wheel 26 Brake member 26a Space part 26b Brake recess 28 Bearing member 30 Brake ball 32 Rotating pin 34 Stopper member 36 Stopper pin 38 Stopper piece

Claims (4)

  An axle to which wheels are attached; a frame to which the axle is attached; a rotation pin that is fixed to the axle and protrudes laterally; a braking ball that is slidably inserted into the rotation pin; A braking member attached to an axle and containing the rotating pin and the braking ball, and a stopper means for stopping the rotation of the braking member, and the rotating pin and the braking ball are rotatably accommodated in the braking member. When a space portion is formed and the rotation of the axle exceeds a certain level, the braking ball is fixed to the peripheral portion in the space portion, the rotation pin is prevented from rotating in the space portion, and the braking member is also rotated. A brake device characterized in that the axle is stopped by being limited by the stopper means, and the rear wheel is braked.   The brake device according to claim 1, wherein the braking member is formed of a pair of columnar members and is provided with a Mt. Fuji-like space portion extending from the center to the periphery.   The brake device according to claim 2, wherein a braking concave portion into which the braking ball is fitted is provided at one place in a peripheral portion of the space portion. The stopper means is composed of a stopper piece that can be protruded and retracted and a stopper pin that protrudes from the braking member, and when the brake operation is not performed, the stopper piece is retracted to deactivate the brake by the braking member. The brake device according to claim 1, which can be configured as follows.

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