JPS5975802A - Caster unit - Google Patents

Abstract

PURPOSE:To prevent shaking of a vehicle a body when changing its moving direction while allowing a caster to display its original function by providing a guide member which makes a wheel supporting member move linearly back and forth, to a caster unit. CONSTITUTION:On normal traveling, a wheel supporting member 5 is positioned on the rear end side in the moving direction of a guide member 6. If a steering force is applied in the direction of right or left under this condition, the wheel supporting member 5 and the guide member 6 rotate in one body around the axis of a supporting shaft 2, and a wheel 4 follows their movement rapidly with its direction changed in the steering direction. When the moving direction is switched forward or backward, the wheel supporting member 5 moves linearly along the guide member 6 to a position where the rotary lateral axis of the wheel 4 is displaced backward or forward with respect to the rotary axis of the supporting shaft 2, thereby allowing the body to move backward or forward without being shaken right and left.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is widely used in hand-operated carts, self-propelled transport carts, etc., and more specifically, a rotatable member is attached to a fixed support shaft in an up-down position. The present invention relates to a caster unit in which a wheel is pivotally held at a location displaced to one side with respect to the axis of the wheel so as to be rotatable about a horizontal axis.

As shown in Fig. 4, conventional caster units are mounted on a support shaft (02) in a vertical position that is rotatably supported on a base material (01), and wheels (02) that are rotatable around a horizontal axis. The holding member (05) of the wheel (04) is fixed to the holding member (05) in such a way that the rotational horizontal axis of the wheel (04) is displaced to one side with respect to the same front axis of the support shaft (02). However, in this case, since the rotational horizontal axis of the wheel is eccentric with respect to the rotational axis of the support shaft, the direction of the wheel is quickly changed to follow the steering direction of the vehicle body. This is the original feature of casters that allows you to easily and smoothly change the direction of your vehicle when driving in one direction, such as moving forward! However, when changing the direction of movement of the vehicle body, such as when moving a vehicle body into a station in forward motion and leaving the station in reverse motion, the eccentricity of the wheel or an amount close to it may occur. The drawback was that the vehicle body swung around the ground contact point as a fulcrum. In particular, when the vehicle weight is large and the ground pressure (C wheel pressure) of the base axle is high, the pressure between the wheels and the road surface is high. ≠Low friction resistance Greater than the rotational resistance around the spindle in the vertical position,
As a result, the car body rotates around the support shaft, causing a shaking phenomenon, and as a result, if the car body hits the fixed part of the station, it may get crushed and cause IH damage. In the case of the type of self-propelled trolleys, the 11 vehicles deviated greatly from the guidance line due to swinging, and it was no longer possible to drive them on the self-steering type hill (which could even lead to a fall). There were drawbacks.

In view of the above-mentioned circumstances, the present invention makes it possible to effectively suppress the shaking of the vehicle body when changing IJJ in the traveling direction while effectively demonstrating the original function of the G-V star axle. It has a purpose in making it happen.

The tree development +4' made in order to achieve such purpose 1j■
Characteristic 4.1 of the caster unit is that the wheel retaining member, which is rotatable around the horizontal axis, is attached to the support shaft in the vertical position supported by the base material. Linear t to the front and back sides of the axis of rotation of the shaft
ζ Guide members that are movably supported on the rack are installed in series.

In other words, during normal steering, the wheel holding member and the guide portion t4 are rotated integrally with the support shaft core, and the direction of the wheel is quickly changed in the direction of the steering operation. Although it is possible to ensure that the original function is exerted by causing the following disaster to occur, when changing the direction of travel, the special number
(The C1 holding part H moves linearly VC along the guide member to a position where the rotational horizontal axis of the C1 wheel is displaced rearward in the direction of vehicle movement with respect to the rotational axis of the support shaft. The V-Star 1 is smooth to 1μ! Since the IC is switched, the vehicle body does not swing left and right like in the past, or the swing can be minimized as much as possible. A VC has been developed which allows the direction of travel to be changed accurately and safely without causing the above-mentioned drawbacks due to swinging.

Hereinafter, an example of F5 tree starting point 1 will be explained based on the drawings.

Fig. 1 shows the configuration of the caster unit.

As shown in Figure 2, the mounting is done by attaching a support IIIll (2) in a vertical position to the center of the base material fi+ using a radial bearing (3).
The U-shaped holding part (5) of the wheel (4), which is rotatably supported around the horizontal axis, is attached to the lower end of the support shaft (2) through the support shaft (2). A guide member (6) is provided in series to support the guide member so as to be linearly movable up to a position displaced both forward and backward with respect to the phantom rotation axis eζ.

The guide 1it-material (6) has a pair of left and right guide parts (
(3A), (OA) and both guide parts (6A)
, (6A) has a plate part (6B), and both guide parts (6A) and (6A) are guides along the front and back directions of 1-'F of the opposite surface of AU of (6A). Groove (6a)
, (6b) and (6a), (Ob) are formed.

Further, the guide member (6) is attached by interposing a thrust bearing (7) between the plate portion (6B) and the base member (1).

The wheel holding member (5) is attached to the axle (4a) of the wheel (4).
) is configured in a U-shape with a square opening that supports the wheel holding member (5) on both sides.
At the center, a lower guide groove (6b) of the guide member (6) is located on the vertical axis passing through the rotational horizontal axis of the wheel (4).
(6b) Steady prevention roller t81 that can be moved freely along K
, +81 are pivotally mounted, and each of these rollers (81, +81
At the upper part of the guide member (6), upper guide members ((ia)
, (6a) Moving rollers f91, [91 and +91, 191 that can be freely transferred along K are pivotally mounted.

During normal driving, the wheel holding member (5) is located at the rear end of the guide member (6) in the direction of travel, so if a steering force is applied to the right or left at this portion, , the wheel holding member (6) and the guide member (6) form a support shaft (2).
The wheels (4) rotate integrally around the axis, and the wheels (4) are quickly changed to follow the direction of the steering operation.

However, when switching to forward or reverse, the wheel holding member (6) moves along the guide member (6) to the wheel (4).
) moves linearly to a position where the horizontal axis of rotation is displaced backwards or forwards with respect to the axis of rotation of support shaft (2), so it can move forward or backward smoothly without swinging left or right. This is possible.

The fil1 diagram shows the position 11 of the towpath wire laid on the floor.
1 is detected by a pair of left and right pickup coils, and based on this detection result, a pair of left and right running axes (1
(Motor color of drive!1 for 1, 11 (1) is 0.
31 f&, the caster unit (A) of Jj was damaged at the center of the front end of this truck (tu) and at the center of the rear end (tJ).

When applied to such a self-propelled truck (1), for example, the station +81 & the truck (81) is pulled in and moved to a predetermined location.
Ii 4Yt, after unloading, restart
4 and join the trolley movement route, the ++
Since the bogie (13) does not swing to the left or right when starting, and the amount of swing of the bogie (B1) can be made as small as possible, there is no possibility that the bogie (B1) will collide with the station or hit the towpath wire. This makes it possible to effectively prevent the pickup coil from being misaligned to a large extent.

The caster unit of the present invention is not limited to the above-mentioned electromagnetic induction type self-transporting T11 trolley, but also includes a reflective tape attached to the floor surface instead of the above-mentioned towpath wire 1. There is no optically guided self-propelled transport vehicle configured to detect reflected light with a pair of left and right sensors and automatically drive the vehicle along a reflective tape in a follow-up steering state, or any special induction equipment. , a self-propelled transport trolley configured to drive and travel along a simply determined 7'C constant line;
Furthermore, it goes without saying that the present invention can be used as a transportation cart that does not have a traveling drive source and is driven by a human powered e-trowel.

[Brief explanation of drawings]

1st 1. Fig. 2 is a longitudinal side view and a front view showing the key V and star unit of the present invention, Fig. 8 is a bottom view of a self-propelled transport vehicle showing an example of how the caster unit is used, and Fig. 4 is a conventional gear It is a partially cutaway side view showing Star Units) k. (2)...Mounting is done on the base material, (2)...Spindle, (4)...Wheel, (5)...Wheel holding member, ( 6)...Guide member, +91...
····roller.

Claims (1)

[Scope of Claims] ■ A support shaft in a vertical position rotatably supported on the mounting H base (1) (21 is a support shaft (4) on the horizontal axis that is rotatable with a rigid horizontal axis)
linearly move the holding member (fi) to the front and back sides of the rotation axis of the support shaft (2)! A caster unit characterized in that a guide member (6) for freely supporting a rack is provided in series. (2) The caster unit according to claim σ, wherein the wheel holding member (5) is a roller (with a sill) that can freely roll and move along the inner surface of the guide member (6).