JP3676501B2 - Surveyor tripod - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tripod for a surveying instrument on which a surveying instrument is mounted when surveying is performed.
[0002]
[Prior art]
Usually, a surveying instrument is connected and fixed to a tripod with a screw called a centering rod. The leg head, which is the upper surface of the neck of the tripod, is finished with a precision flat surface and can move so that the surveying instrument slides. In the installation work of the surveying instrument, the centering can freely move within a certain range with respect to the leg head. With the surveying instrument installed on a tripod, lightly tighten the centripetal pin, temporarily fix it, perform leveling and centripetalization, set the surveying instrument in place, and then strengthen the temporarily fixed centripetal pin. Fasten the surveying instrument so that it does not move.
[0003]
[Problems to be solved by the invention]
However, in such a conventional tripod for a surveying instrument, when the leveling and centering of the surveying instrument is completed and the centering rod is rotated to fix the surveying instrument, the rotational force of the leg is smooth. is greater than the frictional force of the surveying bottoms, it occurs slippage between the Ashiatama the surveying bottoms, may shift if pains went centripetal, not redo the installation work has a problem that name should not be produced.
[0004]
An object of the present invention is to provide a tripod for a surveying instrument in which the position of the surveying instrument is not shifted by this fixing.
[0005]
[Means for Solving the Problems]
In the tripod for a surveying instrument of the present invention, a leg, a neck provided at the upper end of the leg, having a mounting hole penetrating in the vertical direction, and provided at the bottom of the neck, one end is instructed to rotate freely to the neck, A centering member having a U-shaped member having an opening and a screw portion that is loosely fitted in the opening of the U-shaped member and fixed in the vertical direction with respect to the U-shaped member, and is inserted through the mounting hole and protrudes from the upper surface of the neck. And a means for urging the U-shaped member away from the bottom surface of the neck.
[0006]
In a tripod for a surveying instrument, preferably, an urging means is provided on a lever provided between the bottom of the neck and the U-shaped member, a bolt screwed into the lever and rotatably supporting the U-shaped member, and a neck of the bolt. And a spring that presses the U-shaped member toward the bottom of the neck.
[0007]
In a tripod for a surveying instrument, preferably, a groove portion in which a biasing means is provided on the bottom surface of the neck portion, an eccentric cam that is provided in the groove portion and abuts against a U-shaped member, and an eccentric lever that rotates the eccentric cam about a rotation axis It consists of.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a tripod for a surveying instrument according to the present invention will be described with reference to the accompanying drawings.
[0009]
1 to 3 show a first embodiment of a tripod for a surveying instrument. The surveying instrument tripod 12 has three legs 14 and a neck 22 provided at the upper end of the leg 14. The surveying instrument 10 is placed on and attached to the leg head 20 which is the upper surface of the neck 22. Each leg 14 includes a pair of parallel leg plates 14a and a slide leg 14b that is slidably supported by the leg plate 14a and extends downward through a clamp 16 provided at the lower end of the leg plate 14a. A stone bump 18 is provided at the lower end of the slide leg 14b.
[0010]
The upper ends of the three legs 14 are connected to a hexagonal plate-like neck portion 22, and the neck portion 22 is provided with a cylindrical hole 23 which is a mounting hole penetrating in the vertical direction in the center. A U-shaped member 30 is attached to the bottom surface 22 a of the neck 22 by a bolt 40. The U-shaped member 30 fixes a hollow centering rod 24 in the vertical direction. The constant center can 24 is inserted through the cylindrical hole 23, and a screw portion 28 formed at the tip of the constant center can 24 protrudes from the upper surface of the neck 22. The screw portion 28 is screwed into a screw hole provided on the bottom surface of the surveying instrument 10. As a result, the surveying instrument 10 is connected to the tripod 12.
[0011]
The U-shaped member 30 includes a pair of support portions 30a extending in parallel and a pivot portion 30b that is provided at an end of the support portion 30a and connects the two support portions 30a. The centering can 24 is loosely fitted to the support portion 30a, and can be displaced along the support portion 30a, but is fixed in the vertical direction. The pivot portion 30b is rotatably supported on the bottom surface 22a of the neck portion 22 by a bolt 40, and the U-shaped member 30 is provided so as to have a slight vertical play with respect to the bolt 40.
[0012]
A spring 44 is provided on the head of the bolt 40, and the spring 44 biases the pivot portion 30b of the U-shaped member 30 toward the bottom surface 22a. The spring 44 is provided to eliminate rattling of the U-shaped member 30 and the lever 42 due to vertical play. Further, a lever 42 having a screw hole is screwed to the bolt 40. The lever 42 is rotatably provided between the bottom surface 22 a and the pivot portion 30 b of the U-shaped member 30.
[0013]
A U-shaped member guide 50 is provided on the bottom surface 22 a of the neck portion 22 at a position symmetrical to the bolt 40 with respect to the cylindrical hole 23. The U-shaped member guide 50 protrudes downward from the bottom surface 22a, and has a groove portion 52 opened to the cylindrical hole 23 side. The U-shaped member guide 50 and the groove portion 52 extend in a direction perpendicular to the U-shaped member 30 in FIG. 2 of the neck portion 22, and the groove portion 52 receives the two end portions 30 c of the U-shaped member 30. That is, when the U-shaped member 30 rotates around the bolt 40, the end 30c can freely move horizontally within the groove 52, but is restricted in the vertical direction .
[0014]
Next, a procedure for attaching the surveying instrument 10 to the tripod 12 will be described. First, the surveying instrument 10 is placed on the leg head 20, and the centering ring 24 is rotated around the axis and temporarily fixed so that the screw portion 28 of the centering ring 24 and the screw hole of the surveying machine 10 are screwed together. That is, at the time of temporary fixing, the surveying instrument 10 can be displaced on the surface of the leg head 20. In this state, the leveling of the surveying instrument 10 itself is performed, and the surveying instrument 10 is slid on the surface of the leg head 20 while looking through the centripetal telescope, and the centroid is centered directly above the measuring point. After completing the centripetal, this is fixed. In this fixing, the lever 42 is rotated clockwise in FIG. As a result, the centering rod 24 is urged in the vertical direction via the U-shaped member 30, and the surveying instrument 10 is set at a predetermined position.
[0015]
More specifically, since the lever 42 is screwed to the bolt 40, the lever 42 moves downward by the pitch of the screw by rotating clockwise. As the lever 42 moves, the pivoting portion 30b of the U-shaped member 30 is displaced downward. The pivot part 30 b of the U-shaped member 30 can be displaced in the vertical direction until it contacts the head of the bolt 40. Since the end 30c of the U-shaped member 30 is supported and fixed to the neck 22, the centering head 26 fitted to the U-shaped member 30 is also pressed downward when the pivoting portion 30b is pressed downward. It is. Accordingly, the surveying instrument 10 screwed to the centering rod 24 is pulled downward and is firmly fixed to the neck portion 22.
[0016]
That is, the U-shaped member 30 is supported and fixed by the end portion 30c and pressed downward by the pivoting portion 30b to urge it in the vertical direction. The centering rod 24 fitted to the U-shaped member 30 fixes the surveying instrument 10 only by a downward pulling force without being given a rotational force. Therefore, the surveying instrument 10 does not move in the horizontal direction , and centripetality does not go wrong.
[0017]
When the surveying is finished and the surveying instrument 10 is removed from the leg head 20, when the lever 42 is rotated counterclockwise, the pivoting portion 30b of the U-shaped member 30 is released from the pressed position. Thereafter, the centering rod 24 is loosened and removed from the surveying instrument 10.
[0018]
4 and 5 show a second embodiment of a tripod for a surveying instrument. The basic configuration is the same as that of the first embodiment, and detailed description thereof is omitted. In addition, the part corresponding to 1st Embodiment is described with the same number. In the second embodiment, the biasing means is an eccentric cam 60 that is provided on the bottom surface 22 a of the neck 22 and is in a symmetrical position of the U-shaped member holding bolt 66 with respect to the cylindrical hole 23.
[0019]
As shown in FIG. 5, the U-shaped member holding bolt 66 is screwed to the bottom surface 22 a of the neck portion 22 at the pivoting portion 30 b of the U-shaped member 30, and the pivoting portion 30 b and the bottom surface 22 a and the head of the bolt 66 are connected. Washers 46 are provided between the two. A groove portion 65 is cut out in a bowl shape on the bottom surface 22a which is symmetrical with respect to the cylindrical hole 23 with respect to the position of the bolt 66. A cylindrical eccentric cam 60 is rotatably provided in the groove 65 and is in contact with the end 30c. An eccentric lever 62 that is substantially perpendicular to the axis of the eccentric cam 60 is integrally formed with the eccentric cam 60. The eccentric cam 60 is rotatably supported around an axis 60a by a bearing (not shown).
[0020]
Next, the operation of this embodiment will be described. For example, when the eccentric lever 62 is rotated in the clockwise direction in FIG. 5, the eccentric cam 60 is rotated around the axis 60a. As the eccentric cam 60 rotates, the distance from the rotating shaft to the point where the eccentric cam 60 abuts on the U-shaped member 30 increases, and the U-shaped member 30 is pressed. Since the U-shaped member 30 is supported and fixed to the neck bottom surface 22a at the pivoting portion 30b, when the end portion 30c is pressed downward, the fixed centering head 26 is pushed vertically downward. Therefore, the surveying instrument 10 screwed into the centering rod 24 is pulled downward and is firmly fixed to the leg head 20.
[0021]
That is, in the second embodiment, contrary to the first embodiment, the U-shaped member 30 is supported and fixed by the pivot portion 30b and pressed downward by the end portion 30c. The U-shaped member 30 and the centering rod 24 fitted to the U-shaped member 30 are both pushed vertically downward, and an effect similar to that of the first embodiment in which the surveying instrument 10 is permanently fixed only by a tensile force is obtained.
[0022]
Also in this embodiment, the surveying instrument 10 can be firmly fixed only by rotating the eccentric lever 62 as described above, and there is no need to redo the centripetal operation. Moreover, what is necessary is just to perform said operation reversely, when removing the surveying instrument 10. FIG.
[0023]
In the first embodiment, the lever 42 is screwed with the bolt 40 and the movement of the screw pitch by the rotation of the bolt 40 is used as a vertical force. However, other means such as a structure that slides a wedge-shaped inclined surface may be used. Further, the spring 44 is for eliminating rattling of the U-shaped member 30 due to slight vertical play when the main fixing is not performed, and other means may be used.
[0024]
【The invention's effect】
As described above, according to the present invention, it is possible to provide a tripod for a surveying instrument in which the position of the surveying instrument is not shifted by the main fixing.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a tripod for a surveying instrument according to an embodiment of the present invention together with the surveying instrument.
FIG. 2 is a plan view of a cervical portion in which the legs of the surveying tripod according to the first embodiment of the present invention are omitted.
3 is a cross-sectional view taken along the line II of FIG. 2 of the tripod for the surveying instrument shown in FIG. 2;
FIG. 4 is a plan view of a cervical portion in which the legs of a tripod for a surveying instrument according to a second embodiment of the present invention are omitted.
5 is a cross-sectional view taken along the line II-II in FIG. 4 of the tripod for the surveying instrument shown in FIG. 4;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Surveying instrument 12 Tripod 22 Neck part 24 Centering rod 30 U-shaped member 40 Bolt 42 Lever 50 U-shaped member guide 60 Eccentric cam

Claims (3)

A leg, a neck provided at the upper end of the leg and having a mounting hole penetrating in the vertical direction; a bottom provided on the bottom of the neck; one end rotatably supported by the neck and having an opening constant having a shaped member, said fixed vertically with respect to the U-shaped member while being loosely fitted into the opening of the U-shaped member, a screw portion projecting from the upper surface of the neck by inserting the mounting hole A tripod for a surveying instrument comprising a center pin and means for urging the U-shaped member away from the bottom surface of the neck.   The biasing means is provided on a lever provided between the neck bottom surface and the U-shaped member, a bolt that is screwed into the lever and rotatably supports the U-shaped member, and a neck portion of the bolt. The tripod for a surveying instrument according to claim 1, comprising a spring that presses the U-shaped member toward the bottom surface of the neck.   The biasing means includes a groove provided on the bottom surface of the neck, an eccentric cam provided in the groove and contacting the U-shaped member, and an eccentric lever for rotating the eccentric cam about a rotation axis. The tripod for a surveying instrument according to claim 1, wherein:

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