JP2015229460A - Brake mechanism of caster - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a brake mechanism of a caster in which a size of a brake lever is increased, a diameter of an engagement gear is increased by arranging on an inner circumference of a wheel to obtain sufficient brake force, and assembly work is simplified.SOLUTION: An operation pin 4 which freely moves vertically is arranged on a support shaft 1. An operation lever 5 is arranged above the operation pin 4. An engagement gear is arranged on a lower part of the support shaft 1. An engagement gear 7 is arranged along a whole inner circumference surface of a wheel 3b of a caster 3. The engagement gear which is freely engaged with and detached from the engagement gear, and a brake operation body 10 for rotating and operating the brake lever 9 are fixed to a lower end part of the operation pin 4. The brake lever 9 is incorporated along the caster 3, a base end part 9a is engaged with the brake operation body 10, and a tip end part 9b is pivotally supported on the frame 2 in a position passing over an axle 3a. The brake lever freely rotates around the tip end part 9b by vertical movement of the operation pin 4. An engagement body 20, which is freely engaged with and detached from the engagement gear 7, is arranged in the middle of the base end part 9a and the tip end part 9b of the brake lever 9.

Description

  The present invention relates to a braking mechanism for casters attached to a side table, a carriage, a cabinet, a television stand, and other boxes.

  Conventionally, as this type of caster braking mechanism, for example, as shown in FIGS.

  In this caster, wheels 23 are rotatably attached to a frame 22 that is pivotally attached to a lower portion of a support shaft 21.

  The support shaft 21 is provided with an operation pin 24 that can move up and down in the vertical direction, and an operation lever 25 is provided in the horizontal direction above the operation pin 24, and an engagement gear 26 is provided below the support shaft 21. It is fixed. A brake lever 27 is pivotally supported inside the frame 22. Further, an engagement gear 28 is fixed to the outer periphery of the axle 23 a of the wheel 23.

  The operation pin 24 is always pressed upward by a spring 30 attached to the support shaft 21, and the cam body 29 is brought into contact with the upper end of the operation pin 24. The lower end of the operation pin 24 is brought into contact with the upper end of the adjustment bolt 31 attached to the brake lever 27. A support shaft braking body 33 that rotates coaxially with the brake lever 27 is detachably disposed on an engagement tooth 26 a of the engagement gear 26. Further, an engagement end 34 a of a wheel braking body 34 attached to the lower portion of the brake lever 27 is detachably disposed on an engagement tooth 28 a of the engagement gear 28.

Japanese Patent No. 3252266

  However, in the conventional caster braking mechanism, the brake lever 27 that is pivotally supported inside the frame 22 is incorporated in a small space below the operation pin 24, so that it is small in size and has a short turning radius. The engagement gear 28 fixed to the outer periphery of the axle 23a is also made very small compared to the diameter of the wheel 23, so that the moment of force is small and sufficient braking force may not be obtained. Had problems.

  Further, in the conventional caster braking mechanism, the brake lever 27 is small, and the place where the brake lever 27 is incorporated is a small space below the operation pin 24. Therefore, it is difficult to incorporate the brake lever 27 into the small space. However, the assembly work may be difficult.

  Therefore, the present invention has an object to solve the above-mentioned conventional problems, and by incorporating the brake lever from the lower end portion of the operation pin along the wheel instead of incorporating it in the small space below the operation pin. A caster braking mechanism that has a large brake lever and an engaging gear provided on the inner circumference of the wheel to increase the diameter of the brake lever and provide a sufficient braking force, as well as an easy assembly operation. It was made for the purpose of providing.

  Therefore, the caster braking mechanism according to the present invention has an operation pin 4 that is movable up and down on the support shaft 1 in a caster in which a wheel 3 is rotatably attached to a frame 2 that is rotatably attached to a lower portion of the support shaft 1. The operating lever 5 is provided above the operating pin 4, the engaging gear 6 is provided below the support shaft 1, the engaging gear 7 is provided along the entire inner surface of the wheel 3 b of the wheel 3, and the operating pin 4, an engaging gear 8 that is detachably engaged with an engaging gear 6 below the support shaft 1, and a brake operating body 10 that rotates the brake lever 9 are fixed. Incorporated along the wheel 3, the base end portion 9 a is engaged with the brake operating body 10, and the tip end portion 9 b is pivotally supported on the frame 2 at a position passing over the axle 3 a of the wheel 3. By moving the pin 4 up and down, The front end 9b of the brake lever 9 is rotatable about the center, and the brake lever 9 is intermediate between the base end 9a and the front end 9b. The engagement body 20 is provided.

  In the caster braking mechanism according to the present invention, the wheel 3 is a twin wheel.

  Furthermore, in the caster braking mechanism according to the present invention, the operation lever 5 is provided so as to penetrate the support shaft 1 in the horizontal direction, and the cam body 12 mounted in the cam chamber 1a of the support shaft 1 is operated to rotate. The cam body 12 is linked to the upper end of the operation pin 4 via the pin hook 13, and the cam body 12 is rotated by the rotation operation of the operation lever 5. Is moving up and down.

  Further, in the caster braking mechanism according to the present invention, the base end portion 9 a of the brake lever 9 is engaged with the brake operating body 10 via a pressing spring 19.

  In the caster braking mechanism according to the present invention, the engaging body 20 has a substantially U-shaped cross section, and is formed on a stop piece 9d provided between the base end portion 9a and the tip end portion 9b of the brake lever 9. It is fixed.

  Since the caster braking mechanism of the present invention is configured as described above, the brake lever can be enlarged, and the engaging gear has a large diameter, so the moment of force is large. Thus, a sufficient braking force can be obtained.

  Furthermore, the caster braking mechanism according to the present invention is configured such that a large-sized brake lever is assembled along the wheel from the lower end of the operation pin, so that the assembly becomes easy and the assembling work is simplified.

It is a perspective view of the twin-wheel type caster provided with the braking mechanism of this invention. It is a side view of the twin-wheel type caster provided with the braking mechanism of this invention. It is a front view of the twin-wheel type caster provided with the braking mechanism of this invention. It is a bottom view of the twin-wheel type caster provided with the braking mechanism of this invention. FIG. 5 is an inner side view of one wheel of the twin wheel caster shown in FIGS. It is sectional drawing of the one wheel of the twin-wheel type caster by the AA in FIG. It is sectional drawing of the twin-wheel type caster shown in FIGS. It is a partial cross section side view of the state which removed one wheel of the twin-wheel type caster shown in Drawings 1-4 (brake release state). It is a perspective view of the brake lever of the braking mechanism of this invention. It is a perspective view of the brake operation body of the braking mechanism of this invention. It is a partial cross section side view of the state which removed the one wheel of the twin-wheel type caster shown in FIGS. 1-4 (braking state). It is a partially broken side view of the twin-wheel caster provided with the conventional braking mechanism. It is sectional drawing of the twin-wheel type caster provided with the conventional braking mechanism.

  DESCRIPTION OF EMBODIMENTS Embodiments of a caster braking mechanism according to the present invention will be described below in detail with reference to the drawings.

  1 to 4 show a double-wheel caster equipped with a caster braking mechanism according to the present invention, and each wheel 3 as a double-wheel is rotatable on a frame 2 that is pivotally attached to the lower part of a support shaft 1. It is attached.

  The support shaft 1 is provided with an operation pin 4 penetrating in the vertical direction, and an operation lever 5 is provided in the horizontal direction above the operation pin 4. 6 is fixed and provided.

  As shown in FIGS. 5 and 6, an engagement gear 7 is provided on the wheel 3 b of each wheel 3 that is a twin wheel along the entire inner circumference.

  As shown in FIGS. 7 and 8, at the lower end of the operation pin 4, the engaging gear 8 and the brake lever 9 which are detachable from the engaging gear 6 at the lower part of the support shaft 1 are rotated. The brake operating body 10 is fastened by a stop nut 11.

  The operation lever 5 is provided so as to penetrate the support shaft 1 in the horizontal direction. As shown in FIGS. 7 and 8, the operation lever 5 rotates the cam body 12 mounted on the cam chamber 1 a of the support shaft 1. I have to. The cam body 12 is linked to the upper end of the operation pin 4 via a pin hook body 13, and the cam body 12 is rotated by the rotation operation of the operation lever 5, so that the operation pin 4 moves up and down. ing. The cam body 12 has a slanted long hole-shaped cam hole 12a formed in the lower portion thereof, and the hook pin 13a of the pin hook body 13 slides, the pin hook body 13 moves up and down, and the operation pin 4 moves up and down. Although the cam mechanism is configured to move, the cam mechanism is not limited to such a cam mechanism.

  The engagement gear 8 can be engaged with and disengaged from the engagement gear 6 so as to brake or release the turning of the wheel 3, and as shown in FIGS. 7 and 8, the through hole 14 of the brake operating body 10. And a fastening hole 17 of the flange 16 provided at the lower end and a fastening hole 18 of the brake operation body 10 are riveted to the brake operation body 10. doing.

  As shown in FIG. 9, the brake lever 9 has a long shape and is incorporated along the inside of each wheel 3 that is a twin wheel. The base end portion 9 a is connected to the brake operating body 10 via a pressing spring 19. The tip portion 9b is pivotally supported on the frame 2 at a position passing over the axle 3a of the wheel 3, and the operation pin 4 is vertically moved so that the tip portion 9b can be rotated around the tip portion 9b. ing. The pressing spring 19 has one end locked to a locking piece 9c protruding from the base end portion 9a of the brake lever 9, and the other end locked to a locking piece 10b protruding from the lower plate 10a of the brake operating body 10. The brake lever 9 is interposed between the base end portion 9a of the brake lever 9 and the lower plate 10a of the brake operating body 10. The pressing spring 19 prevents the base end portion 9a of the brake lever 9 and the lower plate 10a of the brake operating body 10 from rattling when the brake lever 9 is rotated.

  As shown in FIG. 10, the brake operating body 10 is provided with the through hole 14 in the center of the lower plate 10 a, and is engaged with the base end portion 9 a of the brake lever 9 at both ends of the lower plate 10 a. A piece 10c is provided, and the fastening holes 18 are provided at the front and rear ends of the lower plate 10a.

  Further, between the base end portion 9 a and the tip end portion 9 b of the brake lever 9, an engagement body 20 that can be engaged with and disengaged from the engagement gear 7 provided on the wheel 3 b of the wheel 3 by the rotation of the brake lever 9 is provided. Provided. The engaging body 20 has a substantially U-shaped cross section, and is fixed to a stop piece 9d provided between the base end portion 9a and the distal end portion 9b of the brake lever 9, and is substantially U-shaped. The front end portion engages with or disengages from the engagement gear 7 by engaging with the engagement gear 7 of the wheel 3 b or coming off from the engagement gear 7.

  The caster braking mechanism of the present invention configured as described above is operated as follows.

  First, in order to brake the caster, when the operation lever 5 is rotated from the state shown in FIGS. 7 and 8 and the cam body 12 is brought into the state shown in FIG. The lower engaging gear 6 and the engaging gear 8 at the lower end of the operation pin 4 are engaged, and the turning of the wheel 3 is braked.

  As the operation pin 4 rises, the brake operation body 10 fixed to the lower end of the operation pin 4 rises.

  Then, the brake lever 9 pivots upward about the front end portion 9b pivotally supported by the frame 2, so that the engagement body 20 provided between the base end portion 9a and the front end portion 9b of the brake lever 9 is raised. Then, the engagement body 20 engages with the engagement gear 7 of the wheel 3b of the wheel 3, and the rotation of the wheel 3 is braked.

  Accordingly, in the caster braking mechanism according to the present invention, the turning and rotation of the wheels 3 are braked simultaneously.

  Next, in order to release the braking of the caster, when the operation lever 5 is rotated from the state shown in FIG. 11 to the original state and the cam body 12 is brought into the state shown in FIGS. The engagement gear 6 at the lower part of the support shaft 1 and the engagement gear 8 at the lower end of the operation pin 4 are disengaged, and the braking of the turning of the wheel 3 is released.

  As the operation pin 4 is lowered, the brake operating body 10 fixed to the lower end portion of the operation pin 4 is lowered.

  Then, the brake lever 9 pivots downward about the front end portion 9b pivotally supported by the frame 2, so that the engagement body 20 provided between the base end portion 9a and the front end portion 9b of the brake lever 9 is lowered. Then, the engagement body 20 is disengaged from the engagement gear 7 of the wheel 3b of the wheel 3, and the braking of the rotation of the wheel 3 is released.

  Therefore, in the brake mechanism of the caster of the present invention, the turning and rotation braking of the wheel 3 is released at the same time.

  Since the brake mechanism of the caster according to the present invention is configured as described above, the brake lever 9 can be enlarged, and the engaging gear 7 has a large diameter. Becomes larger, and a sufficient braking force can be obtained.

  Further, the caster braking mechanism according to the present invention is configured such that the enlarged brake lever 9 is assembled along the wheel 3 from the lower end portion of the operation pin 4, so that the assembly becomes easy and the assembling work is also simplified. .

DESCRIPTION OF SYMBOLS 1 Support shaft 1a Cam chamber 2 Frame 3 Wheel 3a Axle 3b Wheel 4 Operation pin 5 Operation lever 6 Engagement gear 7 Engagement gear 8 Engagement gear 9 Brake lever 9a Base end part 9b Tip part 9d Stop piece 10 Brake operation body 12 Cam body 13 Pin hook body 19 Press spring 20 Engagement body

Claims (5)

  In a caster in which a wheel (3) is rotatably attached to a frame (2) that is pivotably attached to the lower part of the support shaft (1), an operation pin (4) that is movable up and down is provided on the support shaft (1). The operation lever (5) is provided above the operation pin (4), and the engagement gear (6) is provided at the lower part of the support shaft (1), so that the entire inner circumference of the wheel (3b) of the wheel (3) is provided. An engaging gear (7) is provided along the lower end of the operating pin (4). The engaging gear (8) can be freely engaged with and disengaged from the lower engaging gear (6) of the support shaft (1), and the brake. The brake operating body (10) for rotating the lever (9) is fixed, the brake lever (9) is assembled along the wheel (3), and the base end (9a) is connected to the brake operating body (10). ) At the position where the tip (9b) passes over the axle (3a) of the wheel (3). Is pivoted about the distal end (9b) by the vertical movement of the operation pin (4), and the base end of the brake lever (9) ( 9a) and an end portion (9b) are provided with an engaging body (20) that can be freely engaged with and disengaged from the engaging gear (7) by rotating the brake lever (9). Caster braking mechanism.   2. The caster braking mechanism according to claim 1, wherein the wheels (3) are twin wheels.   The operation lever (5) is provided so as to penetrate the support shaft (1) in the horizontal direction, and rotates the cam body (12) mounted in the cam chamber (1a) of the support shaft (1). The cam body (12) is linked to the upper end of the operation pin (4) via the pin hook (13), and the cam body (12) is rotated by the operation lever (5). The caster braking mechanism according to claim 1, wherein the operation pin (4) moves up and down.   2. The caster braking mechanism according to claim 1, wherein a base end portion (9a) of the brake lever (9) is engaged with the brake operating body (10) via a pressing spring (19). . The engagement body (20) has a substantially U-shaped cross section, and is fixed to a stop piece (9d) provided between the base end portion (9a) and the tip end portion (9b) of the brake lever (9). The caster braking mechanism according to claim 1, wherein the caster braking mechanism is worn.

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