JPH0245766Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a device for preventing erroneous operation of slight movements in a surveying instrument.

The fine movement device of a conventional surveying instrument can be explained from the theodolite shown in FIG. 1, consisting of a lower fixed knob a, a lower fine movement knob b, an upper fixed knob c, and an upper fine movement knob d. In FIG. 1, e is a telescope section, f is a pillar section that rotatably supports the telescope section, g is a horizontal rotation section, h is a leveling table, and i is a scale plate. The structure of the known lower fine adjustment knob b and upper fine adjustment knob d is as shown in FIG.
or the outer cylinder 3 attached to the inside of the leveling table h.
By inserting a screw into the inner cylinder and rotating the fine adjustment knob 2, the fine adjustment screw 1 moves in and out of the outer cylinder 3, and slowly pushes a lever (not shown) connected to a scale plate (not shown) to move the scale. It rotates the board.

When operating the fine adjustment knobs and the like in a surveying instrument, it is necessary to first fix the main body, which consists of the telescope section e, column section f, and horizontal rotation section g, to the leveling table h, and then operate them. To explain the fine rotation operation of a surveying instrument, setting the number on the dial i to 0゜0′0'' or a well-rounded number when you start surveying will not only make calculations easier later, but also prevent mistakes. It is possible to reduce the number of times and increase the efficiency of surveying.For this purpose, by rotating the scale plate i,
Set the upper fine adjustment knob d to 0゜0'0'' or a well-rounded number and aim the telescope section e at the target point. Once the upper fine adjustment knob d is set during the survey, it is rarely used and may be moved by mistake. In this case, a resurvey will have to be carried out.Also, surveying instruments generally have a multi-axis structure, and the telescope with scale plate i set at 0°0′0″ is further set at 0°0′ to the target point. In order to position it at 0'', it is necessary to turn the whole thing, and there is a lower fine movement knob b for that purpose.In other words, the fine movement device of a surveying instrument has two close to each other, an upper fine movement knob a and a lower fine movement knob B. For these fine movement knobs, an upper fixed knob c and a lower fixed knob a are provided to stop their respective rotations.The two closely spaced fine movement knobs b and d are used by the observer while looking at the telescope. Sometimes you may accidentally touch something.

The present invention is a theodolite that prevents erroneous operation by configuring the reference scale plate so that it will not rotate even if the fine adjustment knob is touched or if a fine adjustment knob other than the intended fine adjustment knob is turned by mistake. The object of the present invention is to provide a device for preventing erroneous operation due to slight movement.

The embodiments of the present invention shown in the drawings will be described as follows.

FIG. 3 is a longitudinal cross-sectional view of one embodiment in which the fine adjustment knob erroneous operation prevention device of the present invention is used for the lower fine adjustment knob b of a theodolite, and shows the U-shaped inside of the fine adjustment knob portion 11 having a U-shaped cross section. open edge 11
A large-diameter hole l is formed on the a side, and a small-diameter hole m is formed on the back side of the top portion 11b continuous with the large-diameter hole l. A flange portion 12a having a diameter sufficient to fit into the large diameter portion l is provided near the rear of the fine adjustment screw 12, and a flange portion 12a having a diameter and length that fits into the small diameter portion m is provided at the rear continuous with the flange portion 12a. A fitting portion 12b is formed. An O-ring 13 is fixed to the rear surface of the collar portion 12a with adhesive or the like. Further, a guide groove 14 is provided surrounding the outer periphery of the fitting portion 12b. Also, fitting part 1
A spring engagement hole 15 is provided at the center of the rear end surface of 2b. The fitting part 12b of the fine adjustment screw 12 formed as described above is fitted into the small diameter hole m of the fine adjustment knob part 11, the collar part 12a is fitted into the large diameter hole l, and the spring engagement hole 15 is fitted with the fitting part 12b. One end of the repellent spring 16 is fixed, and the other end is fixed to the back surface of the fine adjustment knob 11, so that the O-ring 13 is always kept away from the stepped wall 17 at the boundary between the large diameter hole l and the small diameter hole m, A guide pin 18 passing through the side circumference of the fine movement knob 11 is engaged with the guide groove 14. The tip of the guide pin 18 is located near the rear end of the guide groove 18. 19
is an outer cylinder which is attached inside the pillar part f or the leveling table h, and into which the threaded part of the fine adjustment knob is screwed. The O-ring 13 is made of a rubber-based material that has high frictional resistance and is highly elastic.

The fine adjustment knob erroneous operation prevention device in the above embodiment of the present invention is normally in the state shown in FIG. Because it is away from the wall 17, the fine adjustment knob 11 is connected to the fine adjustment screw 12.
Freely spin against the opponent. When performing fine adjustment, use the fourth
As shown in the figure, by pressing the fine adjustment knob 11, the O-ring 13 is pressed against the step wall 17, and due to the frictional resistance, the fine adjustment screw 12 is moved together with the rotation of the fine adjustment knob 11, and the O-ring 13 is screwed against the outer cylinder 19. Enter, spiral.

Since the present invention has the above structure, the fine adjustment knob is normally rotated idly relative to the fine adjustment knob, and when making fine adjustment, the fine adjustment knob is configured so that it will not rotate in conjunction with the fine adjustment knob unless it is pressed. Even if the fine adjustment knob is accidentally touched, or even if the fine adjustment knob is turned by mistake, the fine adjustment knob will be turned idly and the scale plate will not rotate, thereby preventing erroneous operation.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the theodolite, Fig. 2 is a sectional view of a known fine movement knob, Fig. 3 is a sectional view showing the fine movement knob in an idling state, and Fig. 4 shows the relationship between the fine movement knob and the screw shaft. It is a sectional view showing an interlocking state. a... Lower fixed knob, b... Lower fine movement knob, c... Upper fixed knob, d... Upper fine movement knob, e... Telescope section, f... Pillar section, g... Horizontal rotating section, h... Leveling base, i...Scale plate, l...Large diameter hole in the U-shape of the fine adjustment knob, m...Small diameter hole in the U-shape of the fine adjustment knob, 11...Fine adjustment knob, 1
1a...Opening part, 11b...Top part, 12...Fine adjustment screw, 12a...Brim part, 12b...Fitting part, 1
3...O-ring, 14...Guide groove, 15...Spring engagement hole, 16...Elastic spring, 17
... Step wall, 18 ... Guide pin, 19 ... Outer cylinder.

Claims (1)

[Scope of utility model registration request] A collar is provided protruding from the base of the fine adjustment screw part, an O-ring is fixed around the rear surface thereof, and a fitting part is formed at the rear continuous with the collar for fitting into the inner surface of the fine adjustment knob, The fine movement knob having a U-shaped cross section has a large diameter hole on its opening edge side into which the collar fits, and a small diameter hole continuous to the large diameter hole into which the fitting part fits. forming a hole,
The fitting part and the collar part of the fine adjustment screw part are fitted into the small diameter part and the large diameter part of the fine adjustment knob part, respectively, and the O-ring is formed so that it can come into contact with the stepped wall part, and is always supported by an elastic spring. A device for preventing erroneous micro-movement operation of a theodolite, characterized in that the collar portion and the stepped wall portion are in a non-contact state, and the micro-movement knob portion cannot be removed from the fitting portion.