JPS5924316B2 - elevator type tripod - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an elevator-type tripod in which a base to which three legs are pivotally connected is provided with an elevating rod that can be raised and lowered, and a pan head is attached to the upper end of the elevating rod.

Generally, this type of elevator-type tripod has a bundle with a pinion gear attached to its base, and an elevating rod that passes through this base has rack teeth that continuously mesh with the pinion gear in the axial direction. It is engraved.

When the bundle is rotated, the elevating rod is moved up and down by engagement between the pinion gear and the rack teeth.

Conventionally, the above-mentioned lifting rod has been machined to have rack teeth continuous in the axial direction on the outer circumferential surface of the lifting rod main body made of a hollow cylindrical extruded member.

For this reason, there were problems in that the manufacturing efficiency of the lifting rod was poor and the cost was high.

The present invention has been made based on the above circumstances, and its purpose is to improve the manufacturing efficiency of the lifting rod and reduce the cost. It is an object of the present invention to provide an elevator-type tripod that can use common parts without the need to prepare dedicated rack members of various lengths for elevating rods of different lengths.

That is, in order to achieve the above object, the present invention forms a fitting part continuous in the axial direction on the outer circumferential surface of the lifting rod main body, and a rack member having a rack tooth part continuous in the axial direction is provided in the fitting part. Inserting and fitting from the axial direction, and inserting and fitting the stopper for adjusting the length of the rack member to the lifting rod main body from the axial direction, and moving by pressing these rack members and stoppers in the axial direction of the lifting rod main body. It is characterized by being fixed in place.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

In the figure, reference numeral 1 denotes a base, and three telescopic legs 2 are pivotally attached to the base 1 so as to be expandable.

These legs 2... are provided with stays 3..., respectively, and the lower ends of these stays 3...
It is attached to the intermediate part of the stay 3 to be slidable and fixed at any position, and by tightening the tightening screw 4, the lower end of the stay 3 is fixed to the leg 2, These legs 2... are fixed at any expanded position.

The base 1 has a lifting rod 5 that passes through this and can be raised and lowered freely.
is provided, and this elevating rod 5 is moved up and down with respect to the base 1 by a rack and pinion mechanism that is linked to the rotation of the bundle 6.

A pan head 7 is removably attached to the upper end of the elevating rod 5, and a camera mounting screw 8 is provided on the upper surface of the pan head 7.
Reference numeral 9 denotes a bread stick for operating the pan head 7.

Next, the elevating rod 5 will be explained.

Reference numeral 10 denotes a lifting rod main body, which is formed from a hollow cylindrical extruded material, and a fitting groove 11 as a fitting portion is continuously formed on the outer circumferential surface of the lifting rod main body 10 in the axial direction. It is integrally formed during extrusion molding.

The fitting groove 11 has a substantially arcuate cross section, and is wider at the back than its opening width, so fitting grooves 14, 14 are formed on both sides along the axial direction.

Note that a groove portion 12 is formed on the outer circumferential surface of the side facing the fitting groove 11 to prevent rotation of the lifting rod main body 10.

A support plate 15 that supports the pan head 7 is attached to the upper end of the lifting rod main body 10, and this support plate 15 has a fitting protrusion 16 protruding from the lower surface of the lifting rod main body 10. It is inserted into the hollow portion 10a on the upper end side and is fixed in a non-removable manner by caulking or bonding with an adhesive.

Furthermore, a mounting screw 17 for mounting the pan head 7 is screwed into a label 18 bored in the center of the support plate 15 from the fitting protrusion 16 side, and the tip thereof is inserted from the top surface of the support plate 15. It protrudes and is prevented from loosening with adhesive, etc.

On the other hand, in the fitting groove 11 of the lifting rod main body 10, for example, two elongated rack members 19.19 are inserted and fitted.
A stopper 25 for length adjustment is inserted and fitted below.

An elevator cap 28 is screwed onto the thread 13 formed on the outer peripheral surface of the lower end of the lifting rod main body 10, and by tightening the elevator cap 28, the rack member 19, 19 and the stopper 25 are attached to the support plate. 1
5 and is clamped in the axial direction and fixed so as not to be movable in the axial direction.

These rack members 19.degree. 19 are integrally molded from, for example, a synthetic resin material, and have a substantially arcuate cross section so as to fit tightly into the fitting groove 11.

Fitting pieces 20.degree. 20 are formed on both sides of the rack member 19.degree. 19 along the longitudinal direction to be closely fitted into the fitting grooves 14.14, respectively.

The surface of the rack member 19.19 is exposed through the opening of the fitting groove 11, and has a large number of rack teeth 21 continuously in the longitudinal direction.
... are formed, and the rack tooth portions 22, 22 are formed.

The tips of the rack teeth 22, 22 are connected to the lifting rod main body 10.
This rack tooth portion 22 matches the extension line of the outer peripheral surface of
, 22 are designed to mesh with a pinion gear (not shown) built into the base 1.

Further, the stopper 25 is made of a synthetic resin material, for example, and is similar to the rack member 19.
The cross section is formed into a substantially circular arc shape so as to fit inside the groove, and fitting pieces 26, 26 are formed on both sides along the longitudinal direction to fit tightly into the fitting groove 14.14.

An abutment protrusion 27 that abuts the end surface of the elevator cap 28 is integrally provided at the lower end of the stopper 25 .

Furthermore, a mounting screw 29 is screwed into the label 30 bored in the center of the elevator cap 28 to tighten and fix the pan head 7 when the pan head 7 is attached to the lower end of the elevator rod 5 and used. ing.

This mounting screw 29 is fitted from inside the elevator cap 28, and its tip end is attached to the elevator cap 28.
It protrudes outward from the bottom surface and is secured with adhesive or the like.

Furthermore, a rubber buffer member 23 is fitted into the lower end side of the lifting rod main body 10.

This buffer member 23 is formed in an annular shape, and its inner circumferential surface is elastically pressed against the outer circumferential surface of the lifting rod main body 10, and its lower surface is fitted with the abutting protrusion 27 of the stopper 25. A notch 24 is provided.

However, in the embodiment of the present invention configured as described above, the support plate 15 is attached to the upper end of the extruded hollow cylindrical lifting rod main body 10, which is separate from the lifting rod main body 10. Fitting the rack members 19, 19 made in the groove 1
The stopper 25 is inserted and fitted into the fitting groove 11 from the lower end side in the axial direction, and the stopper 25 is further inserted and fitted into the fitting groove 11.

Then, the elevator cap 28 is screwed onto the thread 13 of the lifting rod main body 10, and the elevator cap 28 is tightened and the rack members 19, 19 and the stopper 25 are pressed in the axial direction to fit the rack members 19, 19 into the fitting recess. It is fixed within the groove 11.

Accordingly, since the rack member 19.degree. 19 is separate from the lifting rod body 10, it can be mass-produced, for example, by injection molding, and the rack member 19.degree. 19 is separate from the lifting rod body 10.
There is no need to form toothed teeth by machining on the outer circumferential surface of the material, and manufacturing efficiency can be greatly improved, making it convenient for mass production and reducing costs.

Moreover, in this case, the rack member 19.19 is connected to the stopper 25.
Since the stopper 25 is pinched between the support plate 15 and the elevator cap 28 via the stopper 25, the stopper 25 can be applied to various lifting rods 5 of different lengths by changing the length of the stopper 25.

In particular, since the rack members 19 and 19 of this embodiment are divided into two pieces, the unit length of each piece is relatively short;
Changes in the length of the lifting rods 5 can also be accommodated by changing the number of rods inserted.

Therefore, there is no need to prepare rack members 19 of various lengths exclusively for the lifting rods 5, which have different overall lengths depending on the type and size of the tripod, and parts can be made common.

This facilitates parts management and contributes to cost reduction.

In addition, even if an error occurs in the length of the rack member 19, this error can be easily absorbed by supporting the length of the stopper 25, which has the advantage of increasing dimensional accuracy.

Furthermore, according to this configuration, if the rack teeth 21 are damaged, it can be dealt with simply by replacing only the rack members 19, 19, and there is no need to replace the entire lifting rod 5.

Furthermore, since the rack teeth 22° 22 match the extension line of the outer circumference of the lifting rod main body 10, it is compatible with the conventional one in which rack teeth are formed on the outer peripheral surface of the lifting rod main body 10, and is compatible with the existing one. It can be easily implemented for any model.

Further, the buffer member 23 is formed with a notch 24 into which the abutment protrusion 27 of the stopper 25 is fitted, so that the abutment lower part 27 is hidden and the appearance is improved.

Note that the present invention is not limited to the above embodiments.

For example, in the embodiment, the rack member is relatively short,
Although the number of lifting rods can be changed depending on the length of the lifting rod body, the number of lifting rods can be changed, but it is also possible to use a single long rod.

Furthermore, the fitting part is not limited to the fitting groove shown in the above embodiment, but, for example, a part of the outer peripheral surface of the lifting rod body is chamfered along the axial direction, and this chamfered part A protrusion that continues in the axial direction may be provided on the top and the fitting portion may be formed by the protrusion. In this case, a groove that fits into the protrusion is formed on the rack member side.

Furthermore, although the rack member is formed from a synthetic resin material, part or all of this rack member may be formed from a metal material.

In addition, although the tips of the rack teeth constituting the rack member are made to match the extended line of the outer periphery of the lifting rod main body, the tips of the rack teeth are made to protrude or recess from the extended line of the outer periphery of the lifting rod main body. In this case, it is also possible to prevent the lifting rod main body from rotating.

According to the present invention described in detail above, the rack member can be formed by injection molding, die casting, etc., and there is no need to directly carve the rack teeth on the outer peripheral surface of the lifting rod body by machining as in the past. As a result, manufacturing efficiency is greatly improved, making it suitable for mass production and reducing costs.

Moreover, since the rack member is inserted and fitted in the axial direction of the lifting rod body via a length adjustment stopper, variations in the length of the lifting rod body can be dealt with simply by changing the length of the stopper. be able to.

Therefore, it is not necessary to prepare a rack member having a dedicated length for each lifting rod, as the overall length of the lifting rod varies depending on the type and size of the tripod, and it is therefore possible to standardize rack members. Therefore, in this respect as well, there are effects such as contributing to cost reduction.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is a perspective view of an elevator-type tripod, Fig. 2 is an exploded perspective view of a lifting rod, Fig. 3 is a vertical cross-sectional view, and Fig. 4 is a cross-sectional view of Fig. 3. It is a sectional view along the IV-rV line. 1...Base, 2...Leg body, 5...
...Lifting rod, 10... Lifting rod body, 11...
... Fitting portion (fitting groove), 19... Rack member, 22... Rack teeth, 25... Stopper.

Claims (1)

[Claims] 1. A lifting rod is provided on a base to which the legs are pivotally connected, so that it can be raised and lowered freely (in beasts, the lifting rod has a fitting part that is continuous in the axial direction on the outer peripheral surface of the lifting rod body, and this fitting part a rack member having rack teeth continuous in the axial direction is inserted and fitted from the axial direction, and a stopper for adjusting the length of the rack member with respect to the lifting rod main body is inserted and fitted from the axial direction,
An elevator type tripod characterized in that these rack members and stoppers are immovably fixed by pressing in the axial direction of the elevating rod main body.