JPS6039596Y2 - tripod - Google Patents

Description

[Detailed description of the invention] The present invention relates to a tripod used for mounting a camera, telescope, etc., and more specifically to a tripod configured to ensure smooth and rattling-free closing of the main landing gear. be.

Conventionally, in a tripod on which a camera or the like can be mounted, the position, height, and direction can be freely moved and fixed, three tripods are mounted on a base 1 at equal angular intervals in the circumferential direction, as shown in Figure 1. The main landing gear 2 was rotatably supported.

As shown in FIG. 2, the base 1 has bifurcated shaft support recesses 3 protrudingly formed at equal angular intervals in the circumferential direction, and between the opposing inner surfaces 3a, 3a of the shaft support recesses 3. The shaft support protrusion 4 protrudingly formed on the upper end of the main leg 2 is closely fitted, and the rotation shaft 5 fitted in the shaft hole 3b bored in the center of the shaft support recess 3 A shaft support convex portion 4 is rotatably supported.

Further, the inner surfaces 3a of the shaft support recess 3 face each other.

As shown in FIG. 3, 3a is formed on parallel surfaces with a constant inner surface interval m.

By the way, in a tripod equipped with a shaft support recess 3 in which the inner surfaces 3a*3a facing each other are formed in parallel, the shaft support recess 3 and the shaft, which should be in close contact with each other due to manufacturing errors, assembly errors, wear, etc. Since a gap is created between the base and the support protrusion 4, this gap causes play between the base and the main leg when the legs are closed, resulting in the main leg opening against your will when carrying. Ta.

However, in order to eliminate such drawbacks, if the dimensional difference between the opposing surfaces of the shaft support concave portion 3 and the shaft support convex portion 4 is minimized,
There was a problem in that the main leg did not rotate smoothly during use, and the opposing surfaces were likely to wear out, reducing the durability of the shaft support concave portion 3 and the shaft support convex portion 4.

The present invention has been made in view of such conventional circumstances, and an object thereof is to provide a tripod that allows the main legs to be closed smoothly without causing rattling.

An embodiment of the present invention will be described below based on the drawings.

Figure 4 shows the base 1 of an embodiment of a tripod to which the present invention is applied.
This is an enlarged cross-sectional view of the base 1, in which bifurcated shaft support recesses 3 are formed protrudingly spaced at equal angular intervals in the inner circumferential direction of the base 1.

Further, the opposing inner surfaces of the shaft support recess 3 are formed such that the opening side inner surface is formed into parallel surfaces 3a1, 3a1 with a constant distance m between the opposing inner surfaces, and the inner surface on the closed end side from the shaft hole 3b is formed so that the shaft supports the shaft when the leg is closed. A tapered surface 3a2 in which the sliding surface 4a of the support protrusion 4 is brought into close contact with each other so that the distance between opposing inner surfaces gradually changes from m to n.
? It is formed at 3 a2.

The taper dimension of the tapered surface 3a2 can be expressed as (m-n)/l, where e is the length of the tapered portion.

Further, a shaft support convex portion 4 formed protruding from the upper end of the main leg 2 is closely fitted into the opposing inner surfaces of the shaft support recess 3,
The shaft support protrusion 4 is rotatably supported by the rotation shaft 5 fitted in the shaft support recess 3.

The above taper dimension allows the main leg 2 to come into close contact with the sliding surface 4a of the shaft support convex portion 4 without causing play when the main leg 2 is closed.
There is no particular numerical limitation, as long as the rotatability is good and the productivity is good.Next, the operation of one embodiment of the present invention constructed as above will be explained.

First, when fixing the tripod at a predetermined position, the main leg 2 is rotated and stopped at a predetermined position, and the telescopic leg 6 fitted to the main leg 2 shown in FIG. The telescoping legs 7 fitted to the legs 6 are each extended, stopped and fixed, and installed on the ground or the like.

When the main legs 2 are closed, the opened main legs 2 are rotated and stopped at a position where the three main legs 2 are substantially parallel, and the telescopic legs 6 are further extended. , 7 to their maximum extent to complete the leg closure.

When the legs are opened, the contact area between the tapered surface 3a2 formed in the shaft support concave portion 3 and the sliding surface 4a of the shaft support convex portion 4 is relatively small, so that the main landing gear 2 is moved lightly without feeling any resistance. Her legs are spread open.

On the other hand, when the leg is closed, the inner surface facing the closed side of the shaft support recess 3 is formed into a tapered surface 3a2, so that the sliding surface 4a of the shaft support convex part 4 at the upper end of the main leg 2 is the opening of the shaft support recess 3. Since it comes into close contact with the side parallel surface 3a and also closely contacts the closed side tapered surface 3a2 with a comparatively wide contact area, the main landing gear 2 rotates firmly with a feeling of relative resistance and reliably rotates. The legs are closed.

Therefore, when the legs are closed, the main legs 2 do not play with respect to the base 1 in either the vertical or lateral directions, so the main legs 2 attached to the base 1 do not move when the legs are closed. This prevents problems such as opening the legs in reverse.

Note that the pivot recess 3 is not limited to the one provided on the base 1 of the embodiment described above, and it goes without saying that it can be similarly applied to one protruding from the upper end of the main leg 2.

Further, the taper formed on the opposing inner surface of the shaft support recess 3 is not limited to the above embodiment, but may be formed from the shaft hole 3b toward the opening side.

As described above, the present invention makes the sliding surface of the shaft support convex part come into close contact with the opposing inner surfaces of the bifurcated shaft support recess when the legs are closed, so that the inner surface spacing on the closed side is made smaller than the inner surface spacing on the open side. Since the tripod has a tapered surface that becomes narrower, the tapered surface formed in the pivot recess and the pivot protrusion come into close contact over a relatively wide range when the leg is closed, and the pivot recess and the pivot protrusion come into close contact when the leg is closed. It is possible to obtain a tripod that does not cause play between the parts.

Therefore, problems such as the main legs, which are closed during carrying, wobbling or opening against one's will, are prevented from occurring.

Moreover, it has an excellent practical effect in that the manufacturing efficiency and cost are almost the same as those of the conventional method.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a tripod, Figure 2 is a cross-sectional view of the base and main leg of a conventional tripod, Figure 3 is an enlarged cross-sectional view of the base, and Figure 4 is a cross-sectional view of the base of a conventional tripod.
The figure is an enlarged cross-sectional view of a base according to an embodiment of the present invention. 1... Base, 2... Main landing gear, 3...
...Spindle support recess, 3a, ...Parallel surface, 3a2...
...Tapered surface, 4...Spindle support convex portion, 4a...
...Sliding surface, 5...Rotation axis, m...
- Distance between opposing inner surfaces on the opening side, n... Distance between opposing inner surfaces on the closed side, l... Taper length.

Claims (1)

[Scope of utility model registration request] In a tripod in which the upper ends of three main legs are rotatably supported at equal angular intervals in the circumferential direction of the base, a bifurcated pivot recess protruding from the base or the upper end of the main legs is provided. On the inner side facing each other,
A tripod characterized in that a tapered surface is formed so that the sliding surfaces of the pivot protrusions come into close contact with each other when the legs are closed, so that the inner surface spacing on the closed side is narrower than the inner surface spacing on the open side.