JPH0442244Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Purpose of invention] (Industrial application field) The present invention relates to a transport rotary vehicle.

(Prior art) As a means of transporting precision-processed products or heavy objects, a row of rotary wheels each having a rotatable ball supported so that a part of it projects upward is installed, and the objects are placed on top of the balls. A conveyor is used for loading and conveying.

The rotating wheels constituting this conveyor are generally designed to elastically support the lower part of a ball support body that supports the balls using springs, and to cushion the load of the conveyed objects (for example, in the 1980s).
(See Publication No. 47127).

By the way, when the above-mentioned rotating wheels are arranged in a row to form a conveyor, if the spring used has a weak spring constant, the objects placed on top of it will vibrate in the vertical direction for a long time. If the spring is too strong, its cushioning properties will be poor and it will not be able to absorb shock loads sufficiently, which may lead to damage if repeated loads are applied.

(Problem to be solved by the invention) However, as disclosed in the above-mentioned publication, if the four corners of the lower surface of the ball support are supported by springs, the spring constant may be adjusted to an optimum value depending on the weight of the transported object. In order to do this, all four springs must be replaced, and in the case of this type of conveyor that uses a large number of rotating wheels, the replacement work is not easy, and many types and numbers of springs are required. There were problems such as increased costs.

In view of this, the present invention was devised for the purpose of providing a rotary transport wheel that can easily adjust the spring force supporting the ball in multiple stages depending on the weight of the transported object.

[Structure of the invention] (Means for solving the problem) In order to solve the problems of the above-mentioned prior art, the present invention includes an outer casing with an open top, and a ball that is fitted into the outer casing and has a ball on the top surface. a ball support body having a ball seat for rotatably supporting the ball; a cover that is substantially integrated with the ball support body and faces a shoulder portion of the ball on the ball seat to prevent the ball from escaping; and this cover. a holding member for preventing the ball support from coming off from the outer casing, a plurality of concentric step-shaped annular spring bearing surfaces are formed on the lower surface of the ball support, and these spring bearing surfaces and the outer casing A plurality of types of coil springs having different spring constants and winding diameters are arranged concentrically with the bottom of the ball supporter to elastically support the ball supporter, and the cover is removed from the outer casing and the ball supporter is extracted. This feature is characterized in that any coil spring can be freely removed.

(Function) Maximizing the load supported by the coil springs can be achieved by using all the coil springs.Also, when the weight of the object to be transported decreases, the holding member can be removed from the outer casing and the cover and ball can be removed. This can be done by extracting the support body above the outer casing, leaving only the coil springs suitable for the weight of the object to be transported, and removing the others. Loads with intermediate values can be handled by selecting a combination of multiple types of coil springs. In either case, the coil spring is supported in a concentric position with the ball support, so it always stably supports the load applied to the ball.
It can exert a buffering function.

(Embodiments) The present invention will be described below with reference to embodiments shown in the drawings.

The outer casing 1 has a bottomed cylindrical shape with an open top, and an air vent hole 2 is opened in the bottom 1A.

The ball support 3 has a ball seat 4 formed in the upper surface thereof, which is a substantially hemispherical recess, and a ball 6 is rotatably inserted into the ball seat 4 through a large number of small balls 5, 5, . . . Supported. At the bottom of the ball support 3, a plurality of stages (three stages in the figure) of spring bearing surfaces 7, 8, and 9 are formed from the outer periphery side to the center, and these spring bearing surfaces gradually become closer to the outer casing as they move toward the center. It is formed in a step-like manner so that the interval becomes smaller with respect to the bottom surface 1A of the body 1.

The cover 10 has a downward U-shaped cross section, and has an overhang 11 facing the shoulder portion of the ball 6 on its upper surface 10A to prevent the ball 6 from escaping, and a peripheral wall 10B of the cover 10
The outer circumferential surface of the outer casing 1 is slidably fitted to the inner circumferential surface of the outer casing 1 as tightly as possible. Also cover 1
The flange 12 on the upper outer periphery of the ball support 3 is fitted inside the circumferential wall 10B of the ball support 3, and the flange 12 is press-fitted between the flange 12 and the wedge ring 14. has been done.

The holding member 15 has a ring shape and is fitted into a stepped portion 10C formed on the upper outer periphery of the cover 10.
This is to prevent the cover 10 from coming off from the outer casing 1, and is fixed to the inner periphery of the outer casing 1 by screwing or the like, although not shown. In the figure, reference numerals 16 and 16 are holes in which a tool for fitting and removing the presser member 15 is engaged.

A plurality of types of coil springs 17, 18, 19 having different spring constants are arranged concentrically between the spring receiving surfaces 7, 8, 9 of the ball support 3 and the bottom 1A of the outer casing 1. In the illustrated example, the outermost coil spring 17 has the largest spring constant, the innermost coil spring 19 has the smallest spring constant, and the coil spring 18 in the middle position has the largest spring constant.
is considered to be the intermediate value. That is, the outermost coil spring 17 has the largest wire diameter, winding diameter, and free length, the innermost coil spring 19 has the smallest wire diameter, winding wire, and free length, and the middle coil spring 18 has the intermediate value. There is.

For example, the outermost coil spring 17 can sink about 3 mm when a load of 100 kg is applied per ball, with a sinking limit of about 180 kg, the middle coil spring 18 sinks about 3 mm when a load of 100 kg or less is applied per ball, and the innermost coil spring 19 sinks about 3 mm when a load of 30 kg or less is applied.
When a load of 100 kg or more is applied, all of the coil springs 17, 18, and 19 are used, when the load is 100 kg or less, the outermost coil spring 17 is excluded and the intermediate and innermost coil springs 18 and 19 are used together, and when the load is 30 kg or less, only the innermost coil spring 19 is used.
By selecting and combining two of types 8 and 19, it is possible to respond to subtle changes in load.

To attach and detach the coil springs 17, 18, 19,
By removing the presser member 15, the ball supporter 3 is pushed up slightly by the coil springs 17, 18, 19, so the upper end of the cover 10 protrudes from the outer casing 1, and if you pinch and pull it up, the coil springs 17,
18 and 19 are exposed, and unnecessary coil springs can be easily removed and inserted when necessary.

After loading the required coil springs, insert the ball support 3 into the outer casing 1 again, and press the presser member 15.
If you fix it with , the setting will be completed again.

Although the illustrated embodiment shows a basic structure in which one ball 6 is supported in one outer casing 1, it is also possible to support a plurality of balls in one outer casing. Further, the number of installed coil springs is not limited to three, and can be increased or decreased as desired depending on the application.

[Effect of idea]

As explained above, according to the present invention, the ball support that rotatably supports the ball is cushioned and supported by multiple types of coil springs arranged concentrically with respect to the center of the ball support, and the ball support is moved from the outer casing. Since the coil springs can be attached and detached by pulling them out, depending on the magnitude of the load that the ball receives, by removing the coil springs or combining them together, it is possible to provide optimal cushioning and support for the objects being handled. The coil spring is stably supported by the step-shaped annular spring bearing surface formed concentrically with the center of the ball on the lower surface of the ball support, so there is no bias due to load, and the transported object is always transported smoothly. I can do it. Furthermore, since it is supported by multiple coil springs arranged concentrically, the coil spring 1
It has various effects such as the wire diameter and winding diameter of each wire can be made small, it does not need to be bulky even when used for large loads, it can be constructed compactly, and it can be obtained at low cost.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of a rotary transport vehicle according to the present invention, FIG. 2 is a front view thereof, FIG. 3 is a plan view thereof, and FIG. 4 is a bottom view thereof. 1...Outer housing, 1A...Bottom, 3...Ball support, 4...Ball catch, 6...Ball, 7,
8, 9...Spring bearing surface, 10...Cover, 11...
Overhanging portion, 15... Pressing member, 17, 18, 19
...Coil spring.

Claims (1)

[Scope of utility model registration request] an outer casing with an open top; a ball support having a ball seat fitted into the outer casing and rotatably supporting the ball on its upper surface; A cover facing the shoulder portion of the ball on the strike plate to prevent the ball from escaping, and a holding member to prevent the cover from coming off from the outer casing, and a concentric step-shaped cover on the lower surface of the ball support. A plurality of annular spring bearing surfaces are formed, and a plurality of types of coil springs having different spring constants and winding diameters are arranged concentrically between these spring bearing surfaces and the bottom of the outer casing. 1. A rotating vehicle for transportation, characterized in that any coil spring can be removed by elastically supporting the cover and removing the ball support from the outer casing.