JPH03243401A - Caster - Google Patents

Abstract

PURPOSE:To improve operativity for attaching an elastic member by forming an elastic member for applying elastic force to a stopper in a rotation regulating means which regulates a rotation of a support yoke with a wheel pivoted at a predetermined position, out of a plate-like spring material with its center bent. CONSTITUTION:Numerous bearing balls 9 are interposed between respective ball receiving parts 5A, 6A recessed on outer peripheral edges of facing surfaces of an upper and a lower spring pans 5, 6 fitted into a rivet 3 which is hung under the center of a mounting disk 2. A rotating plate 10A of a support yoke 10 is rotatably fitted between the upper and lower bearing balls 9, while a wheel 11 is supported on a fork 10B hung from the rotating plate 10A. A stopper 13 is pivoted on a stopper shaft 12 bridged over the fork 10B, and a pin 16 fixed to the fork 10B is inserted into a bent-shaped pin hole 15 which is formed on an end wall 13' of the stopper 13. A plate-like spring material 18 with the center bent is placed between the pin 16 and the shaft 12 to energize the pin 16 and the shaft i2 so that they go away from each other.

Description

[Detailed description of the invention] [Industrial application field]

The present invention is directed to an improvement in a stopper biasing means for a caster which can be switched to a straight direction by restricting the rotation of the rotatable caster.

[Conventional technology]

As shown in Utility Model Application Publication No. 63-197704 shown in Fig. 7, a caster equipped with a stopper and capable of moving in a straight line is provided with a circle centered on the stopper shaft 12'', which is the pivot axis, on the side of the stopper 13''. Pin hole 15 in an arc shape
Open the fork of the support yoke 10' and fit both ends of the pin 16' together with the pin hole 15'' into the pin support hole 10D' formed in the fork OB' of the support yoke 10'. A known structure is known in which a spring hook protruding from the side wall passes a coil spring 18' between the pin 17' and the coil spring 18' on both outside sides of the side wall of the stopper 13' to urge the pin 17' in the direction of the stopper shaft 12'. ing.

[Problems to be solved by the invention]

However, in the above configuration, it is necessary to provide the coil spring 181 on the outside of the side wall of the stopper 13', and in order to make the elastic force uniform, it is necessary to arrange a pair of left and right coil springs 18'. Here, it is necessary to provide a space for installation between the fork of the support yoke and the side wall of the stopper 13', which has the disadvantage of inevitably increasing the size, and it is complicated to assemble the 18° coil spring in that space. It is a work in progress. This invention was created in view of the above circumstances, and
The main objective is to provide a caster that saves space and is easy to install by providing a plate-shaped spring member with a curved center inside the stopper between the stopper shaft and the pin.

[Means to solve the problem]

In order to solve the above problems, the present invention provides (a) a support yoke that pivotally supports a wheel on a mounting base plate so as to be pivotable in the lateral direction, and a pivoting mechanism that restricts the rotation of the support yoke at a predetermined position. (b) The rotation regulating means is arranged above between a fixing plate fixed to a lower part of the mounting plate and having a latching hole, and opposing forks of the support yoke. A stopper formed widely along the width and pivoted by a stopper shaft, a pin whose both ends are fitted into pin support holes formed in the fork of the support yoke and urged by a resilient member, and a pin of the stopper. A pin hole formed in a pair of side walls hanging on both sides and into which a pin is inserted at a position away from the stopper shaft, and a locking pawl that projects upward in the middle of the stopper and fits into the locking hole. In the caster in which the locking pawl fits into the locking hole when the stopper tip is swung upward, (C), the elastic member is made of a plate-shaped spring material with a curved center. One connecting portion of the end portion is locked to the stopper shaft inside the side wall of the stopper, and the other connecting portion is locked to the pin to bias the pin in a direction away from the stopper shaft. d) A technical measure is taken in which the pin hole for guiding the pin has its center approached the stopper shaft and both ends curved in a substantially dogleg shape in a direction away from the stopper shaft.

[Effect]

The elastic member is made of a curved plate-shaped spring material, and can be locked to the stopper shaft and the pin on the inside. Therefore, during installation, one centrally curved plate-shaped spring material is used as the stopper shaft. Just fit it between the pins. Since the spring material is fitted inside the stopper, there is no need to provide a space for attaching the elastic member on the outside of the stopper, and the size of the stopper can be reduced.

【Example】

A preferred embodiment of this invention will be described below based on the drawings. A rehet 3 is hung vertically at the lower part of the center of the mounting base plate 2 of the caster 1 shown in FIGS. Hair ring receiver a5, lower hair ring receiver 6, fixing plate 7
It is fitted and secured. The fixing plate 7 is formed into a deep dish shape with a flat lower end surface in the figure, and has locking holes 8 opened in four directions corresponding to the four sides of the mounting base plate 2 in the plane. The upper and lower hair ring receivers 5.6 are configured to secure the bearing balls 9 by recessing ball receivers 5A and 6A in the outer peripheral edges of their opposing surfaces, and the upper and lower hair ring receivers 5.6 A rotating plate 10A of a support yoke 1O is rotatably fitted between the ring balls 9. Forks 10B are arranged symmetrically at both ends of the rotating plate 10A.
A wheel 11 is pivotally attached to the lower end edge of both forks IOH via a support shaft IOC. A stopper shaft 12 is horizontally suspended above the fork IOB at a position close to the fixed plate 7.
2, the stopper 1 is placed close to one of the fork IOBs.
3 is pivotally attached. As shown more clearly in FIG. 4, the stopper 13 has a plate-shaped base with a channel-like cross section, and its wide surface forms a vertical side wall 13', and its tip end is connected to the pedal 13A.
A locking pawl 14 that fits into the locking hole 8 of the fixing plate 7 is provided protruding from the rear upper part of the pedal 13A. The locking claw 14 is positioned so as to fit into the locking hole 8 when the tip of the stopper 13 is swung upward about the shaft 12. A stopper shaft 12 is attached to the side wall 13' of the stopper 13.
It is located closer to the tip than the shaft 12, and has both ends separated outwardly on a circumference centered on the shaft 12, and has an arcuate and approximately inverted character shape with the center set in a position closer to each other. pin hole 15
It forms the frontage. The pin hole 15 has concave portions formed at both longitudinal ends thereof in the direction of the axis 12, so that the pin 16 inserted into the pin hole 15 is difficult to move. In the illustrated example, an outwardly protruding spacer S is integrally provided at the lower end of the side wall 13' to guide the sliding movement of the stopper 13 without wobbling. Alternatively, the stopper 13 may not be provided. Next, both ends of the pin 16 inserted into the pin hole 15 are engaged with a pin support hole 10D formed in the fork IOB. The pin support hole 10D is located at a swing center position of the pin hole 15 that swings when the stopper 13 is pivoted around the stopper shaft 12, and is formed in an elongated oval shape in the direction of the stopper shaft 12. There is. A plate-shaped spring material (hereinafter referred to as a "plate spring") 18 with a curved center as shown in FIGS. 5 and 6 is inserted between the pin 16 and the stopper shaft 12. The pin 16 is always biased in the direction away from the stopper shaft 12. This leaf spring 18 has connecting portions 18a formed at both ends curved in the opposite direction to the central curved portion, and the leaf spring 18 is compressed so that the connecting portions 18a, 18a are brought closer together. It can be fitted into the stopper shaft 12 and pin 16 from the side and engaged with one touch. A required number of casters 1 having the above configuration are hung on the lower part of the object to be mounted, with the mounting base plate 2 facing in the same direction. Here, when the pedal 13A portion of the stopper 13 is depressed downward, the stopper 13 swings its tip portion downward about the stopper shaft 12, and in the process, the pin 16 resists the leaf spring 18 and pivots. The stopper 13 is pushed in the direction away from the pin hole 12 and fits into the recess on the shaft 12 side at the upper end of the pin hole 15, and the stopper 13 does not swing and the support yoke 10
The rotary plate 10A is supported by upper and lower bearing balls 9 and can rotate around the rehet 3. On the other hand, when the stopper 13 is pushed upward from the unlocked position shown by the solid line in FIG. It moves in the direction approaching the shaft 12 to narrow the distance between the ends of the leaf spring 18 and increase the repulsive force (
See Figure 6(b) @). By further pushing up the stopper 13, the pin 16 is fitted into the recess on the shaft 12 side at the lower end of the pin hole 15.
(see figure (c)), the position is locked and the locking protrusion 14 on the top of the stopper 13 fits into the locking hole 8 of the fixing plate 7 (first
(See imaginary line in figure). This prevents the support yoke 10 from rotating around the rivet 3, so that the object to be attached moves straight in the direction of rotation of the wheels 11. In this way, the pedal 13A'l of the stopper 13 is again
tM, the support yoke lO rotates freely, so if, for example, the object to be attached changes its course to the right angle direction and the pedal 13A is swung upward, the locking pawl 14 will fit into another locking hole 8. The straight course is maintained. This invention is not limited to the above embodiments, and the design can be modified as appropriate. For example, the stopper 13 has a pedal 13A attached to one side, but the pedal 13A may be extended to the other side around the stopper shaft 12 and operated like a seesaw. Further, the number of hooking holes is not particularly limited.

【Effect of the invention】

This invention uses a plate-shaped spring material with a curved center as an elastic member, and it is sufficient to lock it to the stopper shaft and pin at the ends. When it is passed between the shaft and the pin and the above-mentioned restraint is released, both ends are engaged with the stopper shaft and the pin with a single touch due to the elastic return force, so the installation work is extremely easy and the work efficiency can be improved. In addition, since the elastic member is a curved plate-shaped spring material, it is not necessary to attach it to the outside of the side wall of the stopper as in the past, and it can be attached to the inside of the side wall. There is no need to provide a space for this, and the size can be reduced. Moreover, since the spring material can be set to be wide enough to correspond to the width between the side walls of the stopper, even if there is only one spring material, the elastic force can be increased. Furthermore, the effect as a stopper of the conventional structure can be achieved without any problem, which is advantageous.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway side view of a support yoke of a caster according to a preferred embodiment of the present invention, FIG. 2 is a plan view of the same, and FIG.
The figure is a rear view with a part of the supporting body cut away, Figure 4 (a)
is a plan view of the stopper, FIG. 5(b) is a side view of the stopper, and FIG.
6(a) is a plan view of the leaf spring, FIG. 6(b) is a side view of the same, and FIGS. 6(a) to 6(c) show the stopper shaft, pin, pin support hole, and the like when changing from the unlocked position to the locked position. FIG. 7 is an explanatory view showing the movement of the leaf spring, and is a side view showing a conventional caster. 1 ・ ・ ・ 2 ・ ・ ・ 8 ・ ■ 10 ・ ◆ 10B ・ 10D ・ 11 ・ ・ l 2 ・ ・ 13 ・ ・ ] 4 ・ ・ 15 ・ ・ l 6 ◆ ◆ l 8 ・ ・ ・Casters・Mounting plate・Latching hole, support yoke, fork, pin support hole, wheel, stopper shaft, stopper, locking pawl, pin hole◆Pin, plate spring 0B (a) -5-

Claims (2)

[Claims] (1) A caster comprising a support yoke that pivotally supports a wheel on a mounting base plate so as to be pivotable in the lateral direction, and a swing restriction means for regulating the swing of the support yoke at a predetermined position, the caster comprising: The regulating means is formed widely along the width of the fixing plate fixed to the lower part of the mounting plate and has a locking hole above the opposing forks of the support yoke, and is pivoted by a stopper shaft. a stopper, a pin having both ends fitted into a pin support hole formed in the fork of the support yoke and biased by an elastic member, and a pin formed on a pair of side walls hanging down on both sides of the stopper and connected to the stopper shaft. It consists of a pin hole into which a pin is inserted in the separated position, and a locking pawl that protrudes upward in the middle of the stopper and engages with the locking hole, and when the tip of the stopper is swung upward. In a caster in which the locking pawl fits into the locking hole, the resilient member is made of a plate-shaped spring material with a curved center, and one connecting portion of the end thereof engages with the stopper shaft inside the side wall of the stopper. The other connecting part is locked to the pin, urging the pin in the direction away from the stopper shaft, and the pin hole has the center approaching the stopper shaft and both ends approximately in the direction away from the stopper shaft. A caster characterized by being curved into a dogleg shape. (2) The connecting parts formed at both ends of the spring material are curved in the opposite direction to the curve of the center, and the spring material is compressed inward and fitted between the stopper shaft and the pin, and the elasticity of the spring material is The caster according to claim 1, wherein the both ends are engaged with the stopper shaft and the pin by a return force.