JP3512484B2 - Prevention device for sliding leg of surveying tripod - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heavy weighing surveying instrument,
The present invention relates to a sliding leg deviation prevention device for a tripod used for installing a GPS antenna or the like using a pole.

[0002]

2. Description of the Related Art Generally, a surveying instrument is used by being installed on a surveying tripod. The surveying tripod is roughly composed of a pair of guide legs having a set portion at the upper portion and a slide leg having a stone projection portion at the lower end portion and slid by being guided by the pair of guide legs. A fastening member is provided below the pair of guide legs, and a fastening screw is provided on the fastening member.
The slide leg is clamped and fixed to the pair of guide legs by frictional action by adjusting a fastening screw. Adjustment of the length of the slide leg is stepless.

A surveying tripod is also used in the GPS positioning system. The GPS positioning system
It consists of a GPS antenna for catching a signal from an artificial satellite and a main body for processing the caught signal, and the GPS antenna is set on a surveying tripod. In this case, because the signal from the artificial satellite has directivity, in an area where visibility over the antenna is not good, in order to raise the antenna high, a dedicated antenna pole 1 is attached to the surveying tripod 2 as shown in FIG. It is set in the setting part 2 ', the antenna pole 1 is extended, and the GPS antenna 3 is installed at the tip of the antenna pole 1. In order to secure the stability of the GPS antenna 3, a tensile force is applied to the antenna pole 1 by the wire 4 or the like. ing. In addition, 5 is a locking tool.

[0004]

In the GPS positioning system in which the GPS antenna 3 is set by adding the antenna pole 1 to the surveying tripod 2, the antenna pole 1 is used.
In addition to the weight, the tensile force of the wire 4 is applied to the setting portion 2 ′ of the surveying tripod 2, so that an excessive load is applied to the surveying tripod 2. Further, recently, there are surveying instruments in which a motor, a battery and the like are built in by electrification, and even when this type of surveying instrument is installed on the surveying tripod 2, the burden on the surveying tripod 2 is large. Since the slide leg of the surveying tripod 2 is structured so as to be sandwiched and fixed by a pair of guide legs by frictional action, an excessive load is applied to the surveying tripod 2,
When the weight burden increases, the slide legs may shift due to vibrations or the like that occur during work.

The surveying tripod 2 fixes the position of the surveying instrument,
As it is an important starting point for surveying, a tripod for surveying 2
If the slide leg of is deviated, the surveying accuracy deteriorates.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a pair of guide legs having a set portion on an upper portion thereof and a pair of guide legs having a stone projection portion at a lower end portion thereof. An object of the present invention is to provide a slide leg displacement prevention device for a surveying tripod, which comprises a slide leg guided and slid and clamped and fixed to the pair of guide legs by a fastening member installed under the pair of guide legs. To do.

[0007]

In order to solve the above-mentioned problems, a sliding tripod slip prevention device for a tripod for surveying according to claim 1 of the present invention has a pair of guide legs having a set portion on the upper part and a lower end. And a slide leg which is provided with a stone protrusion and is slid while being guided by the pair of guide legs and which is clamped and fixed to the pair of guide legs by a fastening member installed under the pair of guide legs. In the tripod, the outer frame body is attached to a portion of the slide leg between the protrusion and the fastening member, and the inner frame body is slidably and projectably inserted into the outer frame body. The outer frame body is provided with fixing means for fixing and maintaining the inner frame body at the protruding position.

In order to solve the above-mentioned problems, a slide leg deviation preventing device for a surveying tripod according to a third aspect of the present invention is provided.
A pair of guide legs having a set portion at the upper portion and a pair of guide legs having a stone protrusion at the lower end portion and being slid while being guided by the pair of guide legs and being installed at the lower portion of the pair of guide legs. In a surveying tripod comprising a slide leg clamped and fixed to a leg, an outer frame body attached to the pair of guide legs, and an inner frame body slidably and projectably inserted into the outer frame body. The outer frame body is provided with fixing means for fixing and maintaining the inner frame body at the protruding position.

[0009]

[0010]

According to the slide leg deviation preventing device for a tripod for surveying according to the first aspect of the present invention, the outer frame body is attached to the slide leg portion between the stone projection and the fastening member. The upper part of the outer frame is brought into contact with the fastening member. The inner frame is projected from the outer frame, and the lower part thereof is brought into contact with the stone protrusion. The inner frame is fixed and maintained at the protruding position by the fixing means.

According to the slide leg deviation preventing device for a tripod for surveying according to a third aspect of the present invention, the outer frame is attached to the pair of guide legs. The upper part of the outer frame is brought into contact with the rotating bases of the pair of guide legs. The inner frame body is projected from the outer frame body, and the lower portion thereof is brought into contact with the upper portion of the slide leg. The inner frame is fixed and maintained on the outer frame by the fixing means.

[0012]

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a sliding leg deviation preventing device for a survey tripod according to the present invention will be described below with reference to the drawings.

[0014]

[Embodiment 1] FIG. 1 is a view showing a state in which the slide leg shift preventing device according to claim 1 of the present invention is mounted on a slide leg of a tripod for surveying.

In this figure, the same components as those shown in FIG. 12 are designated by the same reference numerals, and detailed description thereof will be omitted.

The surveying tripod 2 has three legs, and each leg is slid while being guided by the pair of guide legs 6 and 6 and the pair of guide legs 6 and 6, as shown in FIG. And a slide leg 7. A rotating base portion 8 is provided above the pair of guide legs 6, 6. The rotating base 8 is the setting unit 2
It is rotatably attached to the ′ by known means.

A conventional fastening member 9 for sandwiching and fixing the slide leg 7 is provided below the pair of guide legs 6, 6.
Is provided. Reference numeral 10 denotes a fastening screw installed on the fastening member 9, and when the fastening screw 10 is turned in the fastening direction, the pair of guide legs 6 and 6 bend in a direction in which they approach each other, and the slide leg 7 is clamped and fixed. A known retaining member 11 is provided on the upper portion of the slide leg 7 to prevent the slide leg 7 from slipping off, and a stone protrusion 12 having a known structure is provided on the lower portion of the slide leg 7.

The slide leg shift preventing device 13 according to the first aspect of the present invention is attached to a portion of the slide leg 7 between the stone projection 12 and the fastening member 9 as shown in FIG. The slide leg shift prevention device 13 includes an outer frame body 14 and an inner frame body 15. An inner frame body 15 is slidably and projectably inserted into the outer frame body 14 as shown in an enlarged manner in FIGS. The outer frame body 14 and the inner frame body 15 have a U-shaped cross section as shown in FIGS. 5 (A) to 5 (D). As shown in FIG. 5A, a bent plate portion 16 for guiding the slide leg 7 is formed on the upper end portion of the outer frame body 14. A bending plate portion 17 for guiding the slide legs 7 is also formed at the lower end portion of the inner frame body 15 as shown in FIG. 5 (D).

Mounting plates 18 are provided on the upper and lower portions of the outer frame 15 as shown in FIGS. 3, 4, 5B and 5C. The mounting plate 18 is attached to the one side bent portion 14 a of the outer frame body 14 via a rotating pin 19.
The mounting plate 18 is rotatable in the direction of the arrow in FIG. The other side bent portion 14 of the outer frame body 14
A screw member 20 is provided on b. A notch 18a is formed in the mounting plate 18 at a position corresponding to the screw member 20. As shown in FIG. 3, the slide leg shift prevention device 13 applies the slide plate 7 to the outer frame from the arrow Z ′ direction shown in FIG. 5 with the mounting plate 18 rotated in the arrow Z direction. It is inserted into the U-shaped space of the body 14 and the inner frame body 15. With the slide leg 7 inserted in the U-shaped space of the outer frame body 14 and the inner frame body 15, the mounting plate 18 is rotated in the direction opposite to the arrow Z direction to close the U-shaped space, and Member 2
Tighten 0. As a result, the slide leg deviation prevention device 13 is attached to a portion of the slide leg 7 between the stone protrusion 12 and the fastening member 9.

At the lower part of the outer frame body 14, as shown in FIG. 4, a fixing means 21 is provided on the front surface. Fixing means 2
1 is a housing cylinder 23 that houses the compression coil spring 22.
And an operation knob 25 having a fixing pin 24 at its tip. The housing cylinder 23 is provided with an outer frame 1 by means not shown.
It is fixed at 4. A fixing pin 24 is attached to the outer frame body 14.
A pin insertion hole 26 is formed at the installation location. A flange 27 for receiving a spring is formed on the fixed pin 24. The compression coil spring 22 is interposed between the housing cylinder 23 and the flange 27. Compression coil spring 2
2 elastically biases the fixing pin 24 in the direction of inserting it into the pin insertion hole 26.

A plurality of pin insertion holes 15a are formed in the inner frame 15 at predetermined intervals in the longitudinal direction. Further, as shown in FIGS. 5 (B) and 5 (C), engaging bending pieces 15b are formed on the upper portion of the inner frame body 15, and the outer frame body 1 is provided.
The screw member 20 of No. 4 has a retaining pin portion 20a at its tip.
Is provided. The inner frame body 15 has its engaging bent piece 15
B is engaged with the retaining pin portion 20a of the screw member 20 installed at the lower portion of the outer frame body 14 to prevent the outer frame body 14 from slipping off.

In the state shown in FIG. 4, the operating knob 25 is grasped by hand and operated in a direction against the biasing direction of the compression coil spring 22, and the fixing pin 24 is pulled out from the pin insertion holes 15a and 26, and the inner frame is pulled out. The amount of protrusion of the body 15 from the outer frame body 14 is adjusted. Then, when the hand is released from the operation knob 25, the fixed pin 24 is inserted into the pin insertion hole 15a, and the amount of protrusion of the inner frame body 15 from the outer frame body 14 is regulated. The outer frame 14
Of the slide leg shift prevention device 13 so that the upper end of the inner frame 15 contacts the fastening member 9 and the lower end of the inner frame 15 contacts the stone protrusion 12.
And if the slide leg 7 is finely adjusted, the leg shift of the slide leg 7 can be surely prevented.

[0023]

[Embodiment 2] FIG. 6 is a view showing a state in which the slide leg deviation preventing device according to claim 3 of the present invention is attached to the slide legs of a tripod for surveying.

In FIG. 6, the same components as those of FIG. 1 are designated by the same reference numerals, and detailed description thereof will be omitted.

In the second embodiment, the outer frame body 14 is attached to the pair of guide legs 6 and 6 between the rotating base portion 8 and the fastening member 9 as shown in FIG. The outer frame body 14 has a closed cross-sectional shape. The inner frame body 15 has substantially the same structure as that of the first embodiment. As shown in FIG. 9A, the outer frame body 14 has a pair of ear plate portions 26 formed at the upper ends thereof and bent toward the pair of guide legs 6, 6. Similarly, as shown in FIG. 9C, a pair of ear plate portions 26 ′ is also provided at the lower end of the outer frame body 14.
Are formed. Similarly, as shown in FIG. 9D, a pair of ear plate portions 27 are formed here at the lower end of the inner frame body 15, but the ear plate portions 27 may not be provided. The structure of the mounting plate 18 is, as shown in FIGS. 9 (B) and 9 (C),
Abutting plate portions 18b, 18 that abut the pair of guide legs 6, 6.
Same as Example 1 except that b is included. Also,
The structure of the fixing means 21 is the same as that of the first embodiment as shown in FIG.

The outer frame body 14 is inserted into the space 28 between the pair of guide legs 6 and 6, and the pair of ear plate portions 26, 26 and 26 are inserted.
It is mounted on the pair of guide legs 6 by the sandwiching action of the mounting plates 18 and 18 '. The upper end of the outer frame body 14 is brought into contact with the rotating base portion 8. The lower end of the inner frame body 15 contacts the retaining member 11. As a result, the leg shift of the slide leg 7 is prevented as in the first embodiment.

[0027]

[Third Embodiment] FIGS. 10 and 11 show a structure in which pin insertion holes 15a are formed in the slide leg 7 itself in the longitudinal direction at predetermined intervals, and a fixing means 21 is provided on a fastening member 9. The detailed structure of the fixing means 21 is the same as in the first and second embodiments.

According to this structure, the outer frame body 14 and the inner frame body 1
5, the structure of the slide leg deviation preventing device can be simplified.

[0029]

Since the slide leg deviation preventing device for a survey tripod according to the present invention is configured as described above, even if an excessive load is applied to the set portion of the survey tripod, the slide leg for the survey tripod is prevented. This has the effect of preventing the deviation.

[Brief description of drawings]

FIG. 1 is a diagram showing a state in which the slide leg deviation prevention device according to claim 1 of the present invention is attached to a slide leg of a survey tripod.

FIG. 2 is an enlarged perspective view showing a structure of each leg portion of a known surveying tripod.

FIG. 3 is an enlarged plan view showing a slide leg shift preventing device according to claim 1 of the present invention.

FIG. 4 is a side view showing an enlarged and partially broken view of the slide leg shift preventing device according to claim 1 of the present invention.

5 is a cross-sectional view of the slide leg shift preventing device shown in FIG. 4, (A) being a cross-sectional view taken along the line AA of FIG. 4;
4B is a cross-sectional view taken along the line BB of FIG. 4, and FIG.
It is sectional drawing which follows the C line, (D) The sectional view which follows the DD line of FIG.

FIG. 6 is a view showing a state in which the slide leg deviation prevention device according to claim 3 of the present invention is attached to a slide leg of a surveying tripod.

FIG. 7 is an enlarged plan view showing a slide leg shift preventing device according to claim 3 of the present invention.

FIG. 8 is a side view showing the slide leg shift prevention device according to claim 3 of the present invention in an enlarged manner and partially broken away.

9 is a cross-sectional view of the slide leg deviation preventing device shown in FIG. 8, (A) being a cross-sectional view taken along the line AA of FIG.
8B is a sectional view taken along the line BB of FIG. 8, and FIG. 8C is a sectional view of FIG.
It is sectional drawing which follows the C line, and (D) sectional drawing which follows the DD line of FIG.

FIG. 10 is a partial front view showing an example in which the slide leg deviation prevention device according to claim 5 of the present invention is applied to a surveying tripod.

FIG. 11 is a partial side view showing an example in which the slide leg deviation prevention device according to claim 5 of the present invention is applied to a surveying tripod.

FIG. 12 is a diagram showing a state in which a GPS antenna is installed on a conventional tripod for surveying via an antenna pole.

[Explanation of symbols]

6 ... Guide leg 7 ... Slide leg 9 ... Fastening member 12 ... Stone projection 13 ... Slip leg slip prevention device for surveying tripod 14 ... Outer frame 15 ... Inner frame 21 ... Fixing means

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Claims (4)

(57) [Claims] 1. A pair of guide legs having a set portion at an upper portion, a stone projection portion at a lower end portion, and being slid while being guided by the pair of guide legs and being installed at a lower portion of the pair of guide legs. In a surveying tripod including a slide leg that is sandwiched and fixed by the pair of guide legs, an outer frame body that is mounted on a portion of the slide leg between the stone protrusion and the fastening member, and the outer frame body. And an inner frame body slidably and projectably inserted into the outer frame body, and fixing means for fixing and maintaining the inner frame body in the projecting position is provided on the outer frame body. Prevention device. 2. The fixing means is provided in the outer frame body, and a pin insertion hole formed in the outer frame body, a pin insertion hole formed in the inner frame body with a predetermined gap in a longitudinal direction thereof. The slide leg displacement prevention device for a survey tripod according to claim 1, further comprising a fixed pin that is inserted into and removed from the pin insertion hole. 3. A pair of guide legs having a set portion on the upper portion, a stone projection portion on the lower end portion, and being slid while being guided by the pair of guide legs and being installed under the pair of guide legs. In a surveying tripod comprising a pair of slide legs that are sandwiched and fixed by the pair of guide legs, an outer frame body mounted on the pair of guide legs, and slidably and projectably inserted into the outer frame body. And an inner frame body, and the outer frame body is provided with a fixing means for fixing and maintaining the inner frame body at the projecting position. 4. The fixing means is provided in the outer frame body, with a pin insertion hole formed in the outer frame body, a pin insertion hole formed in the inner frame body at a predetermined interval in a longitudinal direction thereof. The slide leg displacement prevention device for a survey tripod according to claim 3, further comprising a fixed pin that is inserted into and removed from the pin insertion hole.