JP2011006045A - Brake mechanism for wheel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a castered vehicle equipped with a brake mechanism that provides a braking force according to an operator's force of pulling a brake lever without enlarging the device.SOLUTION: The brake mechanism includes a wheel mounting member 2 to which a wheel 5 is mounted, and a brake member 6 which has a pin 9 supported on the wheel mounting member 2, an inner-surface rear end portion 14 to be pressed against the outer periphery of the wheel 5 to put brake on the wheel, a wire fixing portion 13 to which force for pressing the inner-surface rear end portion 14 against the outer periphery of the wheel 5 is applied, the inner surface rear end portion 14, the pin 9 and the wire fixing portion 13 being disposed along the rotational direction of the wheel 5 in this order. An elongated hole 11 formed in a wheel mounting member 2 to support the pin 9 is formed so that the pin is movable inside the elongated hole 11 in a direction away from a wheel shaft 4 of the wheel 5 when the inner-surface rear end portion 14 abuts on the outer periphery of the wheel 5.

Description

  The present invention relates to a wheel brake mechanism, and more particularly to a technique of a wheel brake mechanism in which a braking force corresponding to a force with which an operator pulls a brake lever can be obtained without increasing the size of the device.

  Conventional skateboards include a footboard, front wheels, rear wheels, front wheel steering handles, and mudguards for the front wheels. The skateboard is provided with a brake mechanism for the operator to decelerate the skateboard. One end of a wire is connected to a brake lever provided on the handle. The other end of the wire is fixed to the front of the front wheel mudguard. The mudguard is swingably supported by a wheel mounting member that fixes the axle. When the operator pulls the brake lever and the front part of the mudguard is pulled up, the rear part of the mudguard is pushed down. The wheel is decelerated when the rear end of the inner peripheral surface of the mudguard is pressed against the outer periphery of the wheel. In this way, the operator applies a brake to the running skateboard.

  However, in the conventional brake mechanism, a sufficient braking force corresponding to the force with which the operator pulls the brake lever cannot be obtained, so the operator cannot decelerate the wheel to a desired speed within a short time. It is preferable that a small braking force works when the force pulling the brake lever is small, and a large braking force works as the force pulling the brake lever increases. Furthermore, increasing the size of the apparatus is not preferable because it leads to an increase in cost.

  SUMMARY OF THE INVENTION The present invention solves such problems, and an object of the present invention is to provide a wheel brake mechanism that can obtain a braking force according to the force with which an operator pulls a brake lever without increasing the size of the device.

  In order to solve this problem, the present invention includes a wheel mounting means to which a wheel is attached and connected to the vehicle body, a supported portion supported by the wheel mounting means, and a pressing portion that presses against the outer periphery of the wheel and brakes the wheel. And an external force acting portion to which a force for pressing the pressing portion against the outer peripheral portion of the wheel is applied, and the pressing portion, the supported portion, and the external force acting portion are arranged in this order along the rotation direction of the wheel. And a support portion that is formed on the wheel mounting means and supports the supported portion, and the supported portion can move in a direction away from the rotational axis of the wheel when the pressing portion contacts the outer peripheral portion of the wheel. It is what has been.

  Since the support part is formed so that the supported part can move in a direction away from the rotation axis of the wheel when the pressing part comes into contact with the outer peripheral part of the wheel, the support part strongly presses the wheel. Therefore, it is possible to provide a caster-equipped vehicle including a brake mechanism that can move to a position where it can be moved and that can obtain a braking force according to the force with which the operator pulls the brake lever without increasing the size of the device.

It is sectional drawing which shows the brake mechanism in the 1st Embodiment of this invention. It is sectional drawing of the advancing direction of a brake mechanism. It is sectional drawing which shows the brake mechanism of the state which the operator pulled the brake lever. It is sectional drawing which shows the brake mechanism in the 2nd Embodiment of this invention. It is sectional drawing of the advancing direction of a brake mechanism. It is sectional drawing which shows the brake mechanism of the state which the operator pulled the brake lever.

  Hereinafter, a first embodiment of the present invention will be described with reference to FIG. 1, FIG. 2, and FIG. FIG. 1 is a cross-sectional view showing a brake mechanism in the first embodiment. FIG. 2 is a cross-sectional view in the traveling direction of the brake mechanism. A wheel mounting member 2 as a wheel mounting means has a generally cylindrical shape, and a wheel support portion 3 having a U-shaped cross section is formed at one end. The axle 4 is supported at the end portions of the opposite end surfaces of the wheel support portion 3. Although not shown, a handle is attached to the upper end portion of the cylindrical portion of the wheel mounting member 2. The cylindrical portion of the wheel mounting member 2 is rotatably connected to a vehicle body (not shown).

  A braking member 6 serving as a braking means is attached above the wheel 5 and inside the wheel support portion 3. Since the braking member 6 is also used as a mudguard, the cross section is formed in an arc shape with an arch shape. The braking member 6 is formed by bending a metal plate, for example. The braking member 6 is attached to the wheel support portion 3 with a certain clearance from the wheel outer peripheral portion 7 of the wheel 5. A pin holder 8 is provided at the center of the outer periphery of the braking member 6. The pin holder 8 is welded to the braking member 6. The pin holder 8 is formed with a through hole 10 into which a horizontal pin 9 as a supported portion is inserted. The procedure for inserting the pin 9 into the through hole 10 will be described later.

  An elongated hole 11 serving as a support portion is formed at the upper rear of both opposing end surfaces of the wheel support portion 3 having a U-shaped cross section. The long hole 11 is formed so that the pin 9 can move in a direction away from the rotational axis of the wheel 5. A procedure for fitting the pin 9 into the through hole 10 will be described. A central portion of the braking member 6 provided with the pin holder 8 is accommodated in the wheel support portion 3. The width of the braking member 6 and the length of the pin holder 8 having an arched cross section are set to a width and length that can be accommodated in the wheel support portion 3. The central portion of the braking member 6 is accommodated in the wheel support portion 3 and the through hole 10 and the long hole 11 of the pin holder 8 are aligned. The pin 9 is fitted into the through hole 10 of the pin holder 8 from the outside of the long hole 11. The pin 9 is fixed in a state of protruding from both end faces of the wheel support portion 3. As a result, the braking member 6 is supported by the wheel mounting member 2.

  The braking member 6 has an inner peripheral surface rear end portion 14, a pin 9, and a wire fixing portion 13 arranged in this order along the rotation direction of the wheel 5. The other end of the wire 12 is fixed to a brake lever (not shown) provided on the handle.

  FIG. 3 is a cross-sectional view showing the brake mechanism in a state where the operator pulls the brake lever. The braking member 6 swings around the pin 9. When the operator pulls the brake lever and the wire fixing portion 13 is pulled up, the rear end portion 14 of the inner peripheral surface of the braking member 6 is pulled down and pressed by the wheel outer peripheral portion 7. The direction in which the position of the pin 9 moves away from the rotational axis of the wheel 5 along the elongated hole 11 when the operator pulls the brake lever in a state where the rear end 14 of the inner peripheral surface is pressed against the outer peripheral portion 7 of the wheel. Move to. The inner peripheral surface rear end portion 14 moves to a position where the wheel can be strongly pressed. As a result, the operator can greatly decelerate the wheel 5, and therefore the vehicle 1 with casters can be decelerated according to the force of pulling the brake lever.

In order to prevent the pin 9 from moving suddenly when the operator pulls the brake lever, a rubber material 15 as a buffer material is provided. The rubber material 15 is provided inside the wheel support portion 3 and above the pin holder 8. Although the rubber material 15 is used as the buffer material, the present invention is not limited to this. For example, a coil spring may be used. A coil spring 16 is attached to one end of the wire 12 attached to the wire fixing part 13. When the operator releases the brake lever, the braking member 6 returns to the position when the brake lever is not pulled by the elasticity of the coil spring 16 and the rubber material 15.
Next, a second embodiment of the present invention will be described based on FIG. 4, FIG. 5, and FIG. The description overlapping with the first embodiment is omitted, and the same reference numerals are used. FIG. 4 is a cross-sectional view showing a brake mechanism in the second embodiment. FIG. 5 is a cross-sectional view in the traveling direction of the brake mechanism. At the center of the outer periphery of the braking member 6, there is a plate-like bracket 24 in which a long hole 25 is formed in a direction in which the wheel 5 can approach or turn away from the coaxial axis. Are provided in two locations in the same direction. The bracket 24 is welded to the outer peripheral surface 26 of the braking member 6.
The shaft 21 is inserted into the long hole 25 of the bracket 24. Both end portions 22 a and 22 b of the shaft 21 inserted through the long hole 25 are fixed to both opposing end surfaces 23 a and 23 b of the wheel support portion 3 in a caulked state. The bracket 24 welded to the outer peripheral surface 26 of the braking member 6 is movable in a direction away from the rotational axis of the wheel 5 with the shaft 21 inserted through the elongated hole 25. The shaft 21 is a rivet having a caulking structure at both ends, but is not limited to this. For example, the shaft 21 may be fixed with a nut using a bolt.
A rubber material 27 is provided between the shaft 21 and the braking member 6. The rubber material 27 is generally a rectangular parallelepiped. A convex portion 29 is formed on the upper surface of the rubber material 27 facing the shaft 21. The convex portions 29 provided with a pair in the radial direction of the shaft 21 sandwich the outer peripheral surface of the shaft 21 from the horizontal direction. A pair of convex portions 29 are provided at two positions along the axial direction of the shaft 21. Below the shaft 21, a gap 30 is provided between the bracket 24 and the rubber material 27 so that the bracket 24 can approach the rotational axis of the wheel 5 or move away from the coaxial center.
The bottom surface 28 of the rubber material 27 is fixed to the outer peripheral surface 26 of the braking member 6 with an adhesive. The shaft 21 is inserted into the long hole 25 after the rubber material 27 is fixed to the outer peripheral surface 26 of the braking member 6. The rubber material 27 functions as a cushioning material for preventing the slot 25 portion of the bracket 24 from moving suddenly when the operator pulls the brake lever. In the illustrated example, the rubber material 27 is used as the buffer material, but the present invention is not limited to this, and a coil spring may be used.
FIG. 6 is a cross-sectional view showing the brake mechanism in a state where the operator pulls the brake lever. The braking member 6 swings around the shaft 21. When the operator pulls the brake lever and the wire fixing portion 13 is pulled up, the rear end portion 14 of the inner peripheral surface of the braking member 6 is pulled down and pressed by the wheel outer peripheral portion 7. When the operator increases the force of pulling the brake lever in a state where the rear end portion 14 of the inner peripheral surface is pressed by the wheel outer peripheral portion 7, the long hole 25 is guided along the shaft 21, whereby the bracket 24 is moved to the wheel 5. Move away from the axis of rotation. The inner peripheral surface rear end portion 14 moves to a position where the wheel 5 can be strongly pressed. As a result, the operator can greatly decelerate the wheel 5, and therefore the vehicle 1 with casters can be decelerated according to the force of pulling the brake lever.
Thus, in the example of FIGS. 1 to 3, the wheel mounting member 2 to which the wheel 5 is mounted is provided, and the pin 9 supported by the wheel mounting member 2 and the wheel outer peripheral portion 7 are pressed to brake the wheel 5. It has a wire fixing portion 13 to which a force for pressing the peripheral surface rear end portion 14 and the inner peripheral surface rear end portion 14 against the outer peripheral portion of the wheel 5 is provided, and the inner peripheral surface rear end portion 14, the pin 9 and the wire. The long hole 11 formed in the wheel mounting member 2 and supporting the pin 9 is provided with the fixing member 13 and the braking member 6 arranged in this order along the rotation direction of the wheel 5. When the pin 9 comes into contact with the outer peripheral portion of the wheel 5, the pin 9 is formed to be movable in the direction away from the axle 4 of the wheel 5 inside the elongated hole 11. The device can be moved to a position where it can be pressed strongly. Operator without type of can provide a brake mechanism for braking force corresponding to the force to pull the brake lever is obtained.

  Furthermore, in the example of FIGS. 4-6, while providing the wheel attachment member 2 to which the wheel 5 is attached, the bracket 24 supported by the wheel attachment member 2 and the inner peripheral surface pressed by the wheel outer peripheral part 7 and braking the wheel 5 It has a wire fixing portion 13 to which a force for pressing the rear end portion 14 and the inner peripheral surface rear end portion 14 against the wheel outer peripheral portion 7 is applied, and the inner peripheral surface rear end portion 14, the bracket 24, and the wire fixing portion 13. And the braking members 6 arranged in this order along the rotation direction of the wheel 5, and when the rear end 14 of the inner peripheral surface contacts the outer peripheral part 7 of the wheel, the elongated hole 25 through which the shaft 21 is inserted is provided. Since the bracket 24 is formed so as to be movable in the direction away from the axle 4 of the wheel 5, the inner peripheral surface rear end portion 14 can move to a position where the wheel 5 can be strongly pressed, The operator can It is possible to provide a brake mechanism for braking force corresponding to the force pulling the Kireba is obtained.

DESCRIPTION OF SYMBOLS 1 Vehicle with a caster 2 Wheel attachment member 3 Wheel support part 4 Axle 5 Wheel 6 Braking member 7 Wheel outer peripheral part 8 Pin holder 9 Pin 10 Through hole 11 Long hole 12 Wire 13 Wire fixing part 14 Inner peripheral surface rear end part 15, 27 Rubber material 16 Coil spring 21 Shaft 22a, 22b End portion 23a, 23b End surface 24 Bracket 25 Long hole 26 Outer peripheral surface 28 Bottom surface 29 Convex portion

Claims (1)

With wheel attachment means to which the wheel is attached,
A supported portion supported by the wheel mounting means, a pressing portion that is pressed against the outer peripheral portion of the wheel and brakes the wheel, and an external force acting portion to which a force for pressing the pressing portion against the outer peripheral portion of the wheel is applied. And a braking means in which the pressing portion, the supported portion, and the external force acting portion are arranged in this order along the rotation direction of the wheel,
The support portion formed on the wheel mounting means and supporting the supported portion is movable in a direction in which the supported portion moves away from the rotation axis of the wheel when the pressing portion comes into contact with the outer peripheral portion of the wheel. A wheel brake mechanism characterized by

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