JPH11105504A - Revolving caster moving axle location of fork - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make thrust and tractive force when a truck is reversed equal to power when the track is normally advanced by providing an oblong hole of the length of an eccentricity on a fork and incorporating an axle into this oblong hole via a rolling bearing. SOLUTION: An oblong hole 7 of the length of an eccentricity 8 is provided on a fork 4. An axle 5 is incorporated into this oblong hole 7 via a rolling bearing 9. In a revolving caster of this constitution, a wheel 6 stops in a state that the wheel 6 turns to the advancing direction when the advancing of a truck is reversed and the fork 4 moves on the axle of the eccentricity length 8 of the oblong hole 7. At this time, the fork 4 lightly moves by the rolling bearing 9. When the fork 4 finishes moving the eccentricity 8 of the oblong hole 7, the wheel 6 starts to revolve in the advancing direction. Afterward, the wheel 6 advances in the direction determined by the function of the revolving caster. Thus, power which is more than thrust and tractive force for normally advancing the truck is not required at the time of a switching for reversing the advancing of the truck.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an object for traveling, in which when a swivel caster mounted on a bogie frame 1 moves a bogie in a backward direction from a forward direction to a reverse direction, the wheels stop at that position and the eccentric length of the fork moves to move. A turning caster to achieve. (Fig. 3.4)

[0002]

2. Description of the Related Art A conventional swivel caster has a structure in which a swivel shaft 12 changes its eccentricity and a circumference of 180 ° as a radius around a stopped wheel to change its traveling direction. Friction resistance is generated on the ground contact surface of the wheel because it tries to change the direction by in-situ rotation, causing a braking effect on the circumferential motion, and the amount of force trying to push it off with force is proportional to the ground contact width of the wheel, eccentricity It requires twice as much power as the bogie going straight, in inverse proportion to the length. In addition, the trolley meanders left and right by the amount of eccentricity in a narrow passage, and stable operation cannot be performed.

[0003]

SUMMARY OF THE INVENTION A user from a factory to a general household (small size) who is trying to solve the thrust and traction when the bogie on which the swivel casters are mounted in reverse by the amount of force that normally advances. It was invented in order to respond to the strong demands.

[0004]

The structure will be described. (A) The fork 4 is provided with an elongated hole 7 having an eccentricity 8. [B] Rolling bearings are installed at positions where forks are loaded with long holes on the axle. (FIG. 2) [C] A thrust washer 10 or a thrust bearing 11 is incorporated in the axle and the inner surface of the fork. (Fig. 2)
The above-described device is a turning caster in which the top plate 2 and the turning portion 3 are combined.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described. When the traveling of the bogie is reversed, the wheels 6 are stopped in a state where they are oriented in the traveling direction (position A in FIG. 3), and the forks 4 are elongated. 7
On the axle with an eccentric length of 8. (Fig. 3.4)

When the fork moves, a radial load of the fork is applied to the axle, and a rolling bearing 9 is incorporated into the axle to facilitate the movement, and the outer ring of the bearing rotates to reduce the movement of the fork.

When the fork 4 has finished moving along the eccentricity 8 of the elongated hole 7 (position B in FIG. 4), the wheel 6 starts rotating in the traveling direction. Then, proceed in the direction required by the function of the turning caster.

[0008] A thrust load of wheels is applied to the inner surface of the fork, and a thrust washer 10 or a thrust bearing having repellency is incorporated into the axle to facilitate movement of the fork. (Fig. 2)

In a normal swivel caster, two forks are provided on both sides of the wheel (A in FIG. 3), and in a heavy load swivel caster, two forks are provided in the center (B in FIG. 3) in order to reduce the overall height. ) Or three sheets at the center and both sides (C in FIG. 3).

[0010]

As described above, when switching to reverse the traveling of the bogie, it is not necessary to obtain a further amount of power by the thrust and the traction force for normally traveling the bogie.

[Brief description of the drawings]

FIG. 1 is a side view of a swivel caster according to the present invention.

FIG. 2 is a plan view of a mounting position of a rolling bearing and a thrust washer to be incorporated in the axle shown in FIG. 1;

FIG. 3 is an illustrative side view A showing a fork moving position of the swivel caster of the present invention.

FIG. 4 is an illustrative side view B showing a fork moving position of the swivel caster of the present invention.

FIG. 5 is a front view showing the number of frames according to the number of wheels.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bogie frame 2 Top plate 3 Revolving part 4 Fork 5 Axle 6 Wheel 7 Long hole 8 Eccentricity 9 Rolling bearing 10 Thrust washer 11 Thrust bearing 12 Revolving shaft

Claims (2)

[Claims] (1) An elongated hole (7) of an eccentric (8) is provided in a fork (4) attached to a turning portion (3). (B) The rolling bearing 9 is installed at a position where a fork is added to the axle 5 with a long hole. (C) The thrust washer 10 or the thrust bearing 11 is incorporated in the axle 5 at a portion where the wheel and the inner surface of the fork side meet. The swivel caster configured as described above, in which the fork axle position moves. 2. The fork according to claim 1, wherein the fork is provided with a center (FIG. 5B) or a center and both sides (FIG. 5C) for a single wheel. A swivel caster whose axle position moves.