JPH0741763B2 - Casters with fixed stand - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

The present invention relates to an improvement of a caster including a fixed stand that is moved up and down from a stand-by position above a grounding position of a wheel portion of the caster to a fixed position below the wheel.

[Prior art]

Conventionally, this type of caster is, for example, Japanese Patent Publication No. 47-2766.
There are known equipment movement stabilizers related to No. 1 and flexible vehicles with a mounting base according to No. 60-36303, which are screwed together to adjust the height of the fixed stand. The height is adjusted by rotating it to move the ground plane up and down. Therefore, when it has to be moved up and down largely, the operation is troublesome, which is a complicated work. In addition, Japanese Utility Model Publication No. 50-38151 and Japanese Utility Model Publication No. 48-13891 show a configuration in which a fixed stand provided with a lever is operated, but it is easy to operate the lever when locked but difficult to operate when unlocked. There are drawbacks. Also, in Japanese Utility Model Publication No. 48-13891, since the coil spring for return is built in the pipe of the retracting leg, it is necessary to set the diameter of the pipe to be larger than the coil spring, and the supporting leg for the stand becomes larger. There is a drawback that ends up.

[Problems to be Solved by the Invention]

The present invention was devised as a result of earnest research in order to solve the above-mentioned drawbacks, and its main problem is to make it possible to downsize the supporting leg portion and to displace the upper lever upward when the lock is released and when the lock is released. Another object of the present invention is to provide a caster with a fixed stand, which has an excellent operability in which the lower lever can be operated to move the fixed stand up and down with one touch, and the shoe portion can be rotated as needed to perform fine adjustment.

[Means for solving problems]

In order to solve the above problems, the present invention provides a caster with a fixed stand in which a lower end surface of a shoe portion provided on a fixed stand with respect to a grounding position of a wheel portion of a caster can be moved up and down. (A). A stationary casing is provided integrally with the support yoke to provide a cylindrical casing extending in the vertical direction, (b). Providing a support leg portion slidably incorporated in the casing, comprising a large-diameter head portion and a small-diameter leg portion hanging from the head portion; (c). A shoe is provided at the lower end of the leg of the supporting leg, (d). It is externally fitted to the leg portion of the above-mentioned supporting leg portion, is compressible between the bottom face of the supporting leg portion and the bottom portion of the casing, and is built into the casing. When the supporting leg portion descends, the supporting leg portion is attached in the ascending direction. Providing a biasable spring, (e). It is composed of a substantially L-shaped plate, and its bent portion is arranged so as to face upward when the shoe portion is raised, and its base end is pivotally attached to the support leg portion by a thrust pin, and the pivot point can be moved up and down. A lower lever is provided, (f). An elongated hole is provided in the casing that allows the thrust pin to slide up and down, (g). It is composed of a substantially L-shaped plate, and its bent portion is arranged so as to face downward when the shoe portion is raised, and its base end is pivotally attached above the casing to fix the pivot attachment point. , The middle bent portion is pivotally connected to the middle bent portion of the lower lever, and the tip is displaced upward from the tip of the lower lever when the shoe portion is raised, and is displaced downward from the tip of the lower lever when the shoe portion is lowered. Provide an upper lever, (h). A technical measure is taken such that when the upper lever is pushed down and the shoe portion is lowered, the shoe portion is locked by the displacement of the pivot between the bent portions.

[Work]

Due to the lever action of the upper lever and the lower lever, the pivot point of the tip of the lower lever is displaced downward by thrust, pushing the supporting leg downward by a predetermined stroke, and the contact surface of the shoe exceeds the lowest position of the caster wheel. Move it downwards. At this time, the spring is compressed by the lowering of the head portion of the supporting leg portion, and the biasing force acts in the direction of raising the supporting leg portion. Here, since only the shoe portion is in contact with the floor surface, the sliding function of the caster does not work, and the mounted body of the caster can be fixed. Next, when the upper lever and the lower lever are unlocked, the supporting leg is moved upward by a predetermined stroke by the urging force, and the ground contact surface of the shoe part is moved upward beyond the lowest position of the wheel part of the caster. As a result, only the wheel portion comes into contact with the floor surface, so that the sliding function of the casters can be exerted.

【Example】

A preferred embodiment of a caster with a fixed stand according to the present invention will be described below with reference to the drawings. The caster 1 with a fixed stand shown in FIG. 1 and FIG.
A fixed stand is integrally attached to the support yoke 4 of the twin-wheel caster. That is, the fixed stand includes a casing 5 integrally connected to the car bearings of the wheel units 2 and 2 at a position sandwiched between the rear center of the left and right wheel units 2 and 2, and a support leg unit 6 to which a shoe unit 7 is screwed. , A lower lever 8 and an upper lever 9 for moving the supporting leg up and down. Here, the casing 5 has an upper opening and a lower support leg 6
It has a cylindrical shape having a bottom hole portion 5b through which the tip of is inserted. Further, the supporting leg portion 6 has a head portion 6a which is slidable in the casing 5 and which is set in a cylindrical shape having a large diameter, and has a small diameter which hangs coaxially from the head portion and is provided with a screw on the outer periphery. It is composed of a pin having a leg portion 61, is housed in the hollow of the casing 5 with a coil-shaped spring S fitted on the leg portion, and is configured to be freely retractable from the bottom hole portion 5b. . Here, since the upper end of the spring S abuts the head 6a and the lower end abuts the bottom wall of the casing 5, the spring S is compressed by the lowering of the head 6a and urged in the return direction (upward direction). To be done. Next, the shoe portion 7 has a thread groove 71 penetrating vertically and is screwed with the leg portion 61 of the supporting leg portion 6. The tip of the lower lever 8 is pivotally attached to the through hole 62 formed in the head of the supporting leg 6 and penetrating in the lateral direction via the thrust pin P1. Both ends of the thrust pin P1 are constrained by elongated holes 5a formed on both sides of the casing 5 and slid vertically with a predetermined stroke. Further, the tip end of the upper lever 9 is pivotally attached to the receiving cylinder portion 51 formed above the casing 5 and having a hole penetrating in the lateral direction by a fixing pin P3. The middle part of the upper lever 9 overlaps with the middle part of the lower lever 8 and is pivotally attached by a pair of movable pins P2, P2, and the respective tips extend in the separating direction. In the present embodiment, the upper lever 9 and the lower lever 8 each have a shape in which a pair of substantially L-shaped plates are separated from each other and integrated by a connecting plate laterally provided in the width direction on the tip side. A plurality of ridged slip stoppers 81 and 91 are formed on the upper part of each to improve operability. Then, a mounting screw 10 for fixing to a body to which the caster is attached is fitted from above and fixed to the upper portion of the casing 5 having the supporting leg portion 6 built therein. In the case of the present embodiment, the mounting screw 10 has a threaded portion on the upper side, and a lower portion is inserted into the casing 5 via a base portion at an intermediate portion. A groove 11 is formed in an annular shape at the lower end, and a spring washer 12 is externally fitted in the groove 11 to restrain the mounting screw 10 in the casing 5. Further, the wheel portion 2 is composed of a pair of left and right twin wheels in the illustrated example, and is arranged on both left and right sides of the casing 5. With this configuration, when using the fixed stand, the upper lever 9 and the lower lever 8 are moved in a cross shape from the solid line position in the figure toward the alternate long and short dash line position, and the lower lever tip is propelled by leverage. The pin P1 is slid downward by thrust to displace the ground contact surfaces of the supporting leg portion 6 to the shoe portion 7 downward beyond the lowest position of the wheel portion 2 of the caster. Then, the fixed pin P3, the movable pin P2, and the thrust pin P1 are arranged in a straight line, or the movable pin P2 goes beyond that state to the outside (right side in FIG. 1) to be in a toggle state, whereby the upper lever 9 and the lower lever 8 are locked. As a result, the wheel portion 2 of the caster does not slide, and the mounted main body is supported at the fixed position by the fixed stand. Next, in order to release the fixed state, move the lower lever 8 and the upper lever 9 in the opposite directions to move the movable pin P2 to the fixed pin.
The locked state is released by displacing from a straight line formed by P3 and the thrust pin P1 to the inner side (left side in FIG. 1), and the repulsive force of the spring S displaces from the one-dot chain line position to the solid line position, thereby supporting the support leg 6 to the shoe. The part 7 can be returned to the upper position. As a result, the wheel portion 2 can freely slide on the floor surface. The caster 1 with a fixed stand shown in FIG. 5 shows the case where the wheel portion 2 is single, and in this case, the edge of the fixed stand is arranged at the rear of the wheel. Since other configurations are the same as those of the above-described embodiment, the same components are designated by the same reference numerals and the description thereof will be omitted.

【The invention's effect】

Since the present invention is configured as described above, the vertical movement of the fixed stand integrated with the casters can be displaced by a large stroke by one touch, and the vertical movement operation of the fixed stand can be extremely simplified, which is advantageous. In particular, when operating, it is only necessary to depress the lever that has been displaced upwards, so the operation can be performed easily, and the mounted body to which the casters are mounted is a table or stage having a folding structure with a center folding structure. The pedestal is tilted when the mounted body is folded, and the surface on which the caster and stand are mounted becomes an inclined surface that gradually rises in the sliding direction, so the raised position of the fixed stand is the grounding position of the wheel part of the caster. If the height is not significantly higher, the shoe part of the fixed stand may rub against the floor surface when folded, which may hinder the sliding of the casters. Since it has returned, it is suitable because the sliding function of the caster is not impaired. Further, since the spring is fitted on the leg of the supporting leg and the upper end is held down by the head to be built in the casing, it is not necessary to upsize the supporting leg, and the structure of the fixing stand is simple and it is necessary to increase the size. Since it does not get in the way, it can be placed between the wheel parts especially when it is used for a two-wheel caster, and further miniaturization can be achieved, and the difference with the ground surface of the caster at the time of folding can be minimized. Can be made small, which is beneficial.

[Brief description of drawings]

FIG. 1 is a side sectional view of a caster with a fixed stand showing a preferred embodiment of the present invention, FIG. 2 is the same exploded perspective view, FIG. 3 is the same plan view, FIG. 4 is the same front view, and FIG. It is a sectional side view which shows a different Example. 1 …… Caster with fixed stand 2 …… Wheel part 4 …… Supporting yoke 5 …… Casing 6 …… Supporting leg part 7 …… Shoe part 8 …… Lower lever 9 …… Upper lever 10 …… Mounting screw P1 …… Propulsion pin

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference Japanese Patent Publication Sho 57-46841 (JP, B2) Actual Public Sho 48-13891 (JP, Y1) Actual Public Sho 53-31842 (JP, Y2) Actual Public Sho 50- 38151 (JP, Y2)

Claims (1)

[Claims] 1. A caster with a fixed stand in which a lower end surface of a shoe portion provided on the fixed stand with respect to a grounding position of a wheel portion of the caster can be moved up and down to a lower position. A cylindrical casing integrally extending in the vertical direction, a large-diameter head portion and a small-diameter leg portion hanging from the head portion, and a supporting leg portion slidably incorporated in the casing, The shoe portion formed at the lower end of the leg portion of the supporting leg portion and the leg portion of the supporting leg portion are externally fitted, and are compressible between the bottom surface of the head portion of the supporting leg portion and the bottom portion of the casing and built in the casing. A spring capable of urging the support leg portion in the ascending direction when the support leg portion descends, and a bent portion made up of a substantially L-shaped plate arranged so as to face upward when the shoe portion is raised, Propulsion of the base end to the fulcrum A lower lever that is pivotally attached to the casing to raise and lower the pivot point, a long hole provided in a casing that allows the thrust pin to slide up and down, and a bent portion formed of a substantially L-shaped plate, The shoe portion is arranged so as to face downward when it is elevated, and its base end is pivotally attached to the upper part of the casing to fix the pivot point. It consists of an upper lever that is pivotally attached to the bent part and whose tip is displaced upward from the tip of the lower lever when the shoe rises and displaced downward from the tip of the lower lever when the shoe descends. A caster with a fixed stand, which is locked by the displacement of the pivot between the bent portions when the portion is lowered.