JPH09170925A - Tripod for survey device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily perform fine adjustment of the length of each leg at the place around the position where three legs are most contracted. SOLUTION: This three legs are provided with a surface plate 1 on which a survey device is provided and three legs 2 whose opening angle and length are enabled to be adjusted, and each leg 2 is provided with a holding member 3 supported to the surface plate 1 while rotation is allowed, a fix-leg part 5 fixed to the holding member 3, a sliding leg part 6 attached to the fix-leg part 5 while sliding is allowed, and a clamp mechanism 7 which performs fixing/ releasing of the sliding leg part 6 from the fixing leg part 5. And, each leg part 2 is provided with a positioning member 40 which stops the sliding leg part 6 at the position that a gap 39 of a specified interval α is remained between a coming-off-preventing member 9 fixed to the upper end part of the sliding leg part 6 and the holding member 3, when the legs 2 are most contracted. And, when the length of each leg 2 is fine-adjusted, even the sliding leg part 6 is moved to contract the leg 2 to the shortest, the finger made in contact to the coming-off-preventing member 9 does not contact to the holding member 3.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a tripod for a surveying instrument.

[0002]

2. Description of the Related Art As a conventional tripod for a surveying instrument, for example, FIG.
And the one shown in FIG. 8 is known. FIG. 7 is a side view showing a cross section of a part of a tripod for a surveying instrument, and two of the three legs are omitted. FIG. 8 is a view on arrow A in FIG. 7. The tripod for a surveying instrument shown in FIG. 7 and FIG. 8 has a surface plate 71 having a smooth surface 71a on which the surveying equipment is installed, and three legs which are attached to the surface plate 71 and whose opening angle and length are adjustable And 72. Each of the three legs 72 has a holding member 73 rotatably supported on the surface plate 71, a pair of fixed leg portions 74 and 75 having one ends fixed to the holding member 73, and fixed leg portions 74 and 75. Slide leg 7 slidably attached to
6 and a clamp means 77 which is provided at the other end of the fixed leg portions 74 and 75 and which fixes and releases the fixing of the slide leg portion 76 to the fixed leg portions 74 and 75. Rotate the knob 78 of the clamp means 77 in the releasing direction to slide the slide leg 76.
The slide legs 76 are slid with respect to the fixed legs 74 and 75 in a state where the fixation of the legs 72 is released, whereby the legs 72 are expanded and contracted. That is, as shown by the solid line in FIG. 8, the lower end of the retaining member 79 fixed to the upper end of the slide leg portion 76 is the case 80 of the clamp means 77.
Each of the three legs 72 can be extended until it abuts the upper end of the. Further, as shown by the broken line in FIG. 8, each of the three legs 72 can be contracted until the upper end of the retaining member 79 contacts the holding member 73.

When the surveying instrument is placed on the smooth surface 71a of the surface plate 71, each leg 72 is adjusted when the opening angle and the length of each of the three legs 72 are adjusted so that the surveying instrument becomes horizontal. Need to fine tune the length of. At the time of such fine adjustment, the operator attaches a finger (thumb) to the upper end surface and the corner of the retaining member 79.
One of the fixed legs 74 and 75 and the slide leg 76
While gently grasping and, move the slide legs 76 little by little.

[0004]

However, in the above-mentioned conventional technique, each of the three legs 72 can be contracted until the upper end of the retaining member 79 contacts the holding member 73 as shown by the broken line in FIG. Therefore, when each leg 72 is contracted near the most contracted position during the fine adjustment, the retaining member 79
The finger applied to the upper end surface of the touching member 73 touches the holding member 73. Therefore, there is a problem that it is difficult to finely adjust the length of each leg 72 in the vicinity of the position where each of the three legs 72 is most contracted.

The present invention has been made in view of such circumstances, and its problem is to provide a tripod for a surveying instrument which facilitates fine adjustment of the length of each leg in the vicinity of the position where each of the three legs is contracted most. Is to provide.

[0006]

In order to solve the above-mentioned problems, a tripod for a surveying instrument according to a first aspect of the present invention is provided with a surface plate on which a surveying machine is installed and an open angle and A holding member, which has three legs whose lengths are adjustable, each of the three legs being rotatably supported on the surface plate;
A fixed leg portion whose one end is fixed to the holding member; a slide leg portion slidably attached to the fixed leg portion; and a clamp means for fixing and releasing the slide leg portion to the fixed leg portion. A tripod for a surveying instrument, which is configured to extend and contract each leg in a state where the fixing by the clamp means is released, the slide leg when each leg is contracted most to each of the three legs. And a holding means for stopping the slide leg at a position where a predetermined gap is left between the holding member and one end of the retaining member fixed to the end on the platen side. .

When each of the three legs is contracted most, the positioning means provided on each leg is provided between the holding member and one end of the retaining member fixed to the end of the slide leg on the surface plate side. Stop the slide leg at the position where the gap remains. Therefore, with the surveying instrument installed on the surface plate, when finely adjusting the length of each leg so that the surveying instrument is horizontal, move the slide legs to shrink each leg to the most retracted position. Also, the finger applied to the retaining member does not touch the holding member.

According to a second aspect of the present invention, there is provided a tripod for a surveying instrument, wherein a corner portion of the retaining member has a radius corresponding to a shape of a finger applied to the retaining member when adjusting the length of each of the three legs. Is attached.

At the time of adjusting the length of each of the three legs, a finger can be put on the rounded corners of the retaining member, which facilitates the length adjustment.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a side view showing a cross section of a part of a tripod for a surveying instrument according to a first embodiment of the present invention, and two of the three legs are omitted. FIG. 2 is a view on arrow B of FIG.

As shown in FIGS. 1 and 2, the tripod for a surveying instrument is mounted on the surface plate 1 having a smooth surface 1a on which a surveying instrument (not shown) is installed, and is attached to the surface plate 1 and opened. 3 legs 2 with adjustable corners and length. Each of the three legs 2 has a holding member 3 rotatably supported on the surface plate 1.
A pair of fixed legs 4 and 5 each having one end fixed to the holding member 3, a slide leg 6 slidably attached to the fixed legs 4 and 5, and other fixed legs 4 and 5. It has a clamp mechanism (clamping means) 7 which is provided at the end and which fixes and releases the fixing of the slide leg portion 6 to the fixed leg portions 4 and 5.

As shown in FIG. 1, a slit plate 20 shown in FIG. 3 is attached to the lower surface of the surface plate 1 by a screw 21 so as to be rotatable around a shaft 22. The shaft portion 22a of the wind chime 22 is slidably inserted into the slit 20a of the slit plate 20. A male screw 22b that is screwed with a female screw provided on the bottom surface of the surveying instrument is formed at the tip of the shaft portion 22a. With such a configuration, the surveying instrument and the wind chime 22 are provided with a slit plate while the female screw on the bottom surface of the surveying instrument is screwed onto the male screw 22b of the wind chime 22 and the surveying instrument is placed on the smooth surface 1a of the surface plate 1. Since it is rotatable with the shaft 20 about the shaft 22 and movable along the slit 20a of the slit plate 20, the surveying instrument can be moved to any position on the smooth surface 1a.

The left and right shafts (not shown) of the holding member 3 of each leg 2 have a surface plate 1 and a pressing member 2 via a resin member 23.
It is rotatably supported with respect to 5. Holding member 25
Are fixed to the lower surface of the surface plate 1 with bolts 24. With such a configuration, the holding member 3 of each leg 2 is attached to the surface plate 1 as shown in FIG.
Is rotatably supported in the direction of the arrow.

One end (upper end) of the pair of fixed legs 4 and 5 is
Each is fixed to the holding member 3 by a bolt 27 (see FIG. 2).

As shown in FIG. 4, the other end (lower end) of the fixed leg portion 4 is fitted in the hollow portion of the case 10 of the clamp mechanism 7 and is fixed to the case 10 by a bolt 28.
On the other hand, the other end (lower end) of the fixed leg portion 5 is fitted in the hollow portion of the case 10. An L-shaped intermediate member 29 is fitted in the hollow portion at the other end of the fixed leg portion 5, and a retaining portion 29a of this member 29 is locked to the other end of the fixed leg portion 5. This prevents the L-shaped intermediate member 29 from coming off the case 10. The slide leg portion 6 has a sliding member 30.
It is slidably supported by the fixed leg portions 4 and 5 via a and 30b.

A knob 8 is provided in the screw hole 10a of the case 10.
The male screw 31 fixed to is screwed. This male screw 3
1 is inserted into the hole 5a of the fixed leg portion 5, and the tip of the male screw 31 is in contact with the outer surface 29b of the intermediate member 29. When the knob 8 is turned in the releasing direction and the male screw 31 is tightened, the tip of the male screw 31 slides through the intermediate member 29 and the fixed leg portion 5 and the sliding member 30b.
Is pressed against the slide leg 6 and the slide leg 6
The sliding member 30a on the fixed leg portion 4 fixed to the case 10.
Press. As a result, the slide leg 6 is fixed to the fixed leg 4 by the frictional force between the slide leg 30a and the sliding member 30b.
It is fixed at 5. Further, when the knob 8 is turned in the fixing releasing direction and the male screw 31 is loosened, the fixing by the frictional force is released, and the slide leg portion 6 slides with respect to the fixing leg portions 4 and 5 to extend and contract each leg 2. be able to.

A retaining member 9 is fixed by a bolt 33 to the upper end portion (end portion on the surface plate side) of the slide leg portion 6. A stud 34 is fixed to the lower end of the slide leg 6 with a bolt 35.

For each of the three legs 2, the slide leg portion 6 is slid downward with respect to the fixed leg portions 4 and 5, so that the lower end of the retaining member 9 is provided in the case 1 as shown by the solid line in FIG.
It can be extended until it abuts the upper end of 0. This position is the position where each leg 2 is extended most.

On the outer surface of the slide leg portion 6 of each leg 2, when the leg 2 is contracted most, a gap 39 of a predetermined interval α remains between the upper end (one end) of the retaining member 9 and the holding member 3. At a certain position, an L-shaped positioning member (positioning means) 40 that stops the slide leg 6 by contacting the stopper 40a with the lower end of the case 10 is fixed by a bolt 41 (see FIGS. 1 and 2).

With such a structure, each of the three legs 2 slides the slide leg portion 6 upward with respect to the fixed leg portions 4 and 5 to thereby cause the stopper portion 4 of the positioning member 40 to move.
0a can be contracted until it contacts the lower end of the case 10 as shown by the broken line in FIG. This position is the position where each leg 2 is contracted most.

The predetermined space α of the space 39 is large enough to allow a finger to enter it and is expressed by the following equation (1) (see FIG. 2).

L1−L2 = α (2) Here, L1 is the distance from the upper end of the retaining member 9 to the end of the holding member 3 at the position where the leg 2 is most extended. L2 is the movement distance of the slide leg portion 6 from the most extended position to the most contracted position of the leg 2.

Next, the operation of the first embodiment will be described.

When the surveying instrument is placed on the smooth surface 1a of the surface plate 1, each leg 2 is adjusted when the opening angle and the length of each of the three legs 2 are adjusted so that the surveying instrument becomes horizontal. Need to fine tune the length of. At the time of such fine adjustment, an operator puts a finger (thumb) on the upper end surface and the corner portion 9a of the retaining member 9 in a state where the fixing of the slide leg portion 6 by the clamp mechanism 7 is released, and the fixing leg portion 5 Gently grasp the slide leg 6 and the slide leg 6, and move the slide leg 6 little by little.

When each leg 2 is contracted to the most contracted position by sliding the slide leg 6 upward with respect to the fixed legs 4 and 5, the gap between the upper end of the retaining member 9 and the holding member 3 is reduced. At a position where a gap 39 (see FIGS. 1 and 2) having a predetermined interval α remains, the stopper portion 40a of the positioning member 40 abuts the lower end of the case 10 to stop the slide leg portion 6.
Therefore, with the surveying instrument installed on the surface plate 1, when finely adjusting the length of each leg 2 so that the surveying instrument is horizontal,
Even if the slide legs 6 are moved to contract each leg 2 to the most contracted position, the finger applied to the retaining member 9 does not touch the holding member 3. Therefore, it is possible to easily perform fine adjustment of the length of each leg 2 in the vicinity of the position where each of the three legs 2 contracts most.

According to the first embodiment, the gap 39 can be secured only by adding the inexpensive positioning member 40 to the conventional tripod for surveying instrument.

Further, in the first embodiment, the positioning member 40 is made of a soft material, so that the case 10 is damaged by the stopper portion 40a of the positioning member 40 hitting the case 10, for example, the coating is peeled off. Can be prevented. As a result, the surface of the case 10 can be kept clean.

Further, in the first embodiment, if the positioning member 40 has a sufficient thickness to hit the case 10, it is not necessary to provide the positioning member 40 with the stopper portion 40a.

Further, in the first embodiment, the corner portion 9a of the retaining member 9 is provided with a radius corresponding to the shape of the finger to be applied to the retaining member 9 when adjusting the length of each of the three legs 2. Good. In this case, when adjusting the length of each of the three legs 2, it is possible to put a finger on the radius attached to the corner 9a of the retaining member 9, which facilitates the length adjustment.

FIG. 5 shows a tripod for a surveying instrument according to a second embodiment of the present invention.

In the second embodiment, in place of the positioning member 40 in the first embodiment, one of a plurality of bolts 40A (positioning means) for fixing the butt 34 to the slide leg 6 (positioning means) is provided in the case 10. It is configured to secure a gap 39 having a predetermined interval β by abutting on the.

The predetermined space β of the space 39 is large enough to allow a finger to enter it and is expressed by the following equation (2) (see FIG. 5).

L3−L4 = β (2) Here, L3 is the distance from the upper end of the retaining member 9 to the end of the holding member 3 at the position where the leg 2 is most extended. L4 is the movement distance of the slide leg portion 6 from the most extended position of the leg 2 to the most contracted position.

According to the second embodiment described above, the pebbles 34
Since the gap 39 having the predetermined interval β is secured by using one of the plurality of bolts 40A for fixing the to the slide leg portion 6, it is not necessary to add a new member to the conventional tripod for a surveying instrument, It is advantageous in terms of cost. FIG. 6 shows a tripod for a surveying instrument according to a third embodiment of the present invention.

In the third embodiment, instead of the positioning member 40 in the first embodiment, the fixed leg portion 4,
Positioning members (positioning means) 40B, 40B are provided on the inner side of the upper end of each of No. 5 and No. 5. The upper end of the retaining member 9 hits the lower ends of the positioning members 40B, 40B, so that a gap 39 having a predetermined interval α is secured as in the first embodiment.

In the third embodiment, the positioning member 40B may be provided at only one place. Further, the positioning member 40B may be provided integrally with the holding member 3 or the retaining member 9.

[0038]

As described above, according to the tripod for a surveying instrument according to the first aspect of the present invention, when each of the three legs is most contracted, the positioning means provided on each leg is a slide leg. The slide leg is stopped at a position where a predetermined gap is left between the holding member and one end of the retaining member fixed to the end on the surface plate side of the section. Therefore, with the surveying instrument installed on the surface plate, when finely adjusting the length of each leg so that the surveying instrument is horizontal, move the slide legs to shrink each leg to the most retracted position. Also, the finger applied to the retaining member does not touch the holding member. Therefore, it is possible to easily finely adjust the length of each leg in the vicinity of the position where each of the three legs is contracted most.

According to the tripod for a surveying instrument of the second aspect of the present invention, when adjusting the length of each of the three legs, a finger can be applied to the radius attached to the corner of the retaining member, and the length can be adjusted. Adjustment becomes easy.

[Brief description of the drawings]

FIG. 1 is a side view showing a cross section of a part of a tripod for a surveying instrument according to a first embodiment of the present invention.

FIG. 2 is a view on arrow B of FIG.

FIG. 3 is a plan view showing a slit plate used in the tripod for a survey instrument shown in FIG. 1.

FIG. 4 is a cross-sectional view showing a clamp mechanism used in the tripod for a survey instrument shown in FIG.

FIG. 5 is a view showing a tripod for a surveying instrument according to a second embodiment of the present invention, and is a view similar to FIG.

FIG. 6 is a view showing a tripod for a survey instrument according to a third embodiment of the present invention, and is a view similar to FIG.

FIG. 7 is a view showing a conventional tripod for a surveying instrument, and is a view as seen from an arrow A in FIG.

FIG. 8 is a side view showing a cross section of a part of a conventional tripod for a surveying instrument.

[Explanation of symbols]

 1 surface plate 2 legs 3 holding member 4, 5 fixed leg 6 slide leg 7 clamp mechanism (clamping means) 9 retaining member 40, 40B positioning member (positioning means) 40A bolt (positioning means)

Claims (2)

[Claims] 1. A surface plate on which a surveying instrument is installed, and three legs each attached to the surface plate and having adjustable opening angles and lengths, each of the three legs being attached to the surface plate. A holding member movably supported, a fixed leg portion having one end fixed to the holding member, a slide leg portion slidably attached to the fixed leg portion, and the slide leg portion with respect to the fixed leg portion. And a clamp means for fixing and releasing the fixation, and a tripod for a surveying instrument configured to extend and contract each leg in the state where the fixation by the clamp means is released, in each of the three legs. Positioning for stopping the slide leg at a position where a predetermined gap remains between one end of the retaining member fixed to the end of the slide leg on the surface plate side and the holding member when the leg is contracted most Characterized by having means Tripod surveying instrument. 2. The corner of the retaining member is provided with a rounded shape that matches the shape of a finger to be applied to the retaining member at the time of adjusting the length of each of the three legs. Tripod for the survey instrument.