JPH0217356Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a device for preventing erroneous operation of a fine movement knob of a surveying instrument.

A surveying instrument has a sighting axis in a telescope built into the machine, and measures an angle or distance from a measuring point by precisely aligning the sighting axis with a target object, In order to precisely align the sight axis with the target object, it is equipped with a fine adjustment device that performs fine adjustment.

An example of the fine adjustment device is shown below with respect to the cross-sectional view of a known surveying instrument shown in FIG.

A fixed ring 3, which is rotatably provided on the central axis 2 of the cylindrical main body cover 1 of the surveying instrument and has the theodolite main body upper part 4 attached thereto, is rotated at a constant angle with respect to the central axis 2 by a fixing device A. possible, and is constructed so that it can be fixed to the central axis at a desired angle, and the rotation angle of the fixed ring 3 can be finely adjusted by a fixing device (or a fine adjustment device B attached to the fixed ring). The central shaft 2 is constructed of multiple shafts, and each shaft is fixed by a respective fixing device.

That is, the fixing device A forms a recess 5 in the inner circumferential surface of the fixing ring 3, and fits the fixing piece 6 therein.
A cylinder protruding from the vicinity of the recessed part 5 of the fixed ring to the outside of the ring to form a guide protrusion 7 having a threaded hole 8 inside thereof communicating with the recessed part 5, and located near the guide protrusion in the direction of extension. A horizontal elongated hole 9 is formed in the shaped body cover 1 portion, and a fixing screw rod 11 equipped with a fixing knob 10 is passed through the elongated hole 9 and screwed into the screw hole 8, and the tip of the fixing screw 11 is inserted into the screw hole 8. The length of the fixed screw rod 11 is determined so that it is possible to operate the fixed piece 6. Reference numeral 12 denotes an engagement groove of a tip end 23' of a fine adjustment screw rod 23, which will be described later, provided on the side of the guide protrusion 7. Thus, one side of the guide protrusion 7 is pressed against the other side by the spring 13. Further, the fine adjustment device B is provided with a fine adjustment device on a portion of the cylindrical body cover 1 located in the direction in which the guide protrusion 7 of the fixing device A is resiliently repelled, that is, on the extension of the one side and the opposite side. An insertion hole 14 for the screw rod 23 is provided, and the hollow shaft cylinder 21 is fixed to the outer end surface of the peripheral edge 15 forming the insertion hole 14 by screwing or other means so as to protrude outward from the cylindrical main body cover 1. Further, the insertion hole 14 and the center portion of the hollow shaft cylinder 21 are formed to communicate with each other. The hollow part of the hollow shaft cylinder 21 is a screw hole 21', into which a fine adjustment screw rod 23 equipped with a fine adjustment knob 22 is screwed, and the tip 2 is screwed into the hole 21'.
The length of the fine adjustment screw rod 23 is determined so that the screw rod 3' can be engaged with the locking groove 12 of the guide protrusion 7.

The above-mentioned known fixing device A and fine adjustment device B
First, loosen the main adjustment knob 10 of the fixing device, rotate the upper part of the surveying instrument to the desired angle, temporarily tighten the main adjustment knob 10 at that position, and then finely move the surveying instrument. Rotate the knob 22 to adjust the guide protrusion 7 using the tip 23' of the fine adjustment screw 23.
In other words, the angle of the fixed ring 3, which is the object to be finely adjusted, is finely adjusted to align the collimation axis with the target object, and the survey is carried out. Various types of fine movement knobs 2
2 is exposed on the outside of the surveying instrument, and as surveying instruments have become smaller and lighter in recent years in response to the demand for smaller and lighter weight instruments, the various types of exposed micro-movement knobs have become extremely close together. will be located,
The observer looks into the telescope of the surveying instrument and manually aligns and operates the necessary fine movement knobs. There was a drawback that if you touched a knob and turned the knob slightly, you would have to check it again.

In this invention, the fine adjustment knob exposed on the outside of the surveying instrument is always covered with a fine adjustment knob covering tube, and only when the fine adjustment knob needs adjustment, the fine adjustment knob is slid by pressing the fine adjustment knob covering tube. By doing so, in the above pressed state, only the necessary fine adjustment knob is exposed and fine adjustment is made.
By releasing the pressure on the fine movement knob cover tube in the sliding state after fine movement adjustment, the fine movement knob cover tube automatically returns to the previous position and closes the cover of the fine movement knob, allowing the observer to perform surveying. While using the machine,
Even if your hand accidentally touches a fine adjustment knob cover tube other than the necessary fine adjustment knob, the fine adjustment knob covered and closed by the cover tube will not be rotated, so there is no need to check again. This provides a device to prevent erroneous operation of the fine adjustment knob for the fine adjustment device of a surveying instrument, which allows accurate surveying without making mistakes in the reading results, and also prevents the fine adjustment knob from rotating even if the fine adjustment knob cover tube is inadvertently rotated. It is an object of the present invention to provide an erroneous operation prevention device that does not operate together.

This invention will be explained as follows with regard to the embodiment shown in FIGS. 2 to 4.

In the above embodiment, a shaft 2 fixedly connected to the theodolite main body upper part 4 at the upper part and a fixing ring 3 for fixing the shaft in the middle of the shaft are installed in the elongated hole 9 provided on the central axis 2 of the cylindrical cover 1. It consists of a fixing device A that is rotatable within a range and makes it possible to fix the desired fixed ring 3 to the central shaft 2, and a fine adjustment device B associated with the fixed ring 3, said fine adjustment device B This figure exemplarily shows a device for preventing erroneous operation of a fine adjustment knob.

The structure and relationship of the cylindrical cover 1, its central axis 2, fixing ring 3, and fixing device A are the same as those in FIG. . In FIGS. 2 to 4, the same reference numerals as in FIG. 1 indicate the same parts as in FIG. 1.

The device for preventing erroneous operation of the fine adjustment knob for the fine adjustment device of a surveying instrument shown in FIGS. 2 to 4 is as follows.

Screw insertion hole 14 for fine adjustment of cylindrical body cover 1
One side of the guide tube 30 is fixed to the outer open end surface of the peripheral edge 15 forming the cylindrical body cover 1, and the other side is made to protrude outward from the cylindrical body cover 1. One end of the shaft tube 21, which has a through hole with a screw hole 23' for screwing the guide tube 21, is screwed inwardly, and a screw is provided on a part of the outer periphery of the shaft tube 21, and the guide tube 30 is screwed inside. A coil spring engaging portion 31 is formed between the inner surface of the guide tube 30 and the outer surface of the shaft tube 21 by bringing them into contact with each other. Guide tube 3
One side of the fine movement knob covering cylinder 32 is slidably circumscribed on the outer peripheral edge of the 0. The fine movement knob covering tube 32
A guide protrusion 33 is formed approximately in the middle of the inner surface thereof, and is in contact with the outer surface of the shaft cylinder 21, and a coil spring 34 is suspended between the coil spring engaging portion 31 and the guide protrusion 33, and a fine movement knob is formed. Covering cylinder 32
repel outward. In the screw hole 23' of the shaft cylinder 21,
A fine adjustment screw rod 23 provided with a fine adjustment knob 22 is screwed into the screw rod 23, and the tip 23' of the screw rod 23 is connected to the fixing device A.
The guide protrusion 7 is engaged with the engagement groove 12 of the guide protrusion 7 which is elastically repelled by the spring 13 toward the tip of the threaded rod. In the above state, the length of the fine movement knob covering cylinder 32 is determined so that the fine movement knob 22 is completely covered and closed by the fine movement knob covering cylinder 32.

In the above embodiment, by fine adjustment of the fine adjustment knob 22, the tip 23' of the fine adjustment screw rod 23 engages with the engagement groove 12 of the guide protrusion 7, which is always pressed in the direction of the tip by the spring 34. Although an embodiment in which the fine adjustment screw rod 23 is used to finely adjust the object to be finely adjusted, that is, the fixing device A or the fixing ring 3, is not limited to the above-mentioned mechanism. Furthermore, the embodiment described above is a device for preventing erroneous operation of a fine adjustment knob of a fine adjustment device for maintaining a fixed ring 3 having a theodolite main body upper part 4 at a constant angle with respect to the central axis 2 of a cylindrical cover 1. However, the erroneous operation prevention device of the present invention is not only provided for the above-mentioned fine adjustment knob, but also for fine adjustment knobs of other types of fine adjustment devices.

As described above, in the present invention, a guide tube is fixed between the cylindrical main body cover and the intermediate shaft tube, one of the fine movement knob covering tubes can be slid on the protrusion of the guide tube, and the fine movement knob is The other side of the fine movement knob covering cylinder is configured to cover and close the fine movement knob at all times, so it is exposed to the outside of the surveying instrument. The fine adjustment knob is normally covered and closed by the fine adjustment knob cover tube, and only when the fine adjustment knob needs adjustment, the fine adjustment knob of the fine adjustment knob is pressed and slid to move the fine adjustment knob, so that the necessary adjustment is made in the pressed state. If you expose only the fine adjustment knob to be used, perform fine adjustment, and then release the pressure on the fine adjustment knob cover tube that is in the sliding state after fine adjustment, the fine adjustment knob cover tube will automatically return to its previous position and cover the fine adjustment knob. Therefore, even if an observer accidentally touches a fine movement knob cover tube other than the necessary fine movement knob while using the surveying instrument, the cover can be closed on the fine movement knob cover tube. This has the effect of making it possible to always carry out correct measurements without having any effect on the fine movement knob that is set, thus eliminating the need for re-checking and making mistakes in the reading results.

In addition, in the present invention, the fine adjustment knob cover tube, the fine adjustment knob, and the fine adjustment screw rod are not in pressure contact with each other, so even if the fine adjustment knob cover tube is inadvertently rotated, the fine adjustment knob does not move together or have any other effect. There are also other effects.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing a fixing device and a fine adjustment device of a known surveying instrument, Fig. 2 is a longitudinal sectional view of a part of a surveying instrument according to an embodiment of the invention, and Fig. 3 is a fixing device and a fine-adjustment device of this invention. A cross-sectional view showing an example of a fine adjustment device,
FIG. 4 is an enlarged view of a portion of FIG. 3. 1... Cylindrical main body cover, 3... Fixed ring (fine adjustment object), 14... Screw rod insertion hole for fine adjustment, 21
...Hollow shaft cylinder, 21' ...Hollow part of hollow shaft cylinder, 2
2...Fine adjustment knob, 23...Fine adjustment screw rod, 2
3'...Tip of screw rod for fine adjustment, 30...Guide cylinder, 31...Coil spring engagement part, 32...
Fine movement knob covering tube, 33... Guide flange, 34...
…coil spring.

Claims (1)

[Scope of utility model registration request] The fine adjustment screw insertion hole provided in the cylindrical main body cover and the hollow shaft tube are connected by connecting the hollow shaft tube by making the hollow portion communicate with the fine adjustment screw insertion hole provided in the cylindrical main body cover so that the hollow shaft tube protrudes outward from the cylindrical body cover, and the hollow shaft tube is inserted. In a fine adjustment device for a surveying instrument that allows fine adjustment of an object to be finely adjusted by inserting a fine adjustment screw rod with a fine adjustment knob from the open end of the hole, the fine adjustment screw rod insertion hole part A guide cylinder is fixed between the cylindrical main body cover and the hollow shaft cylinder, and one side of the fine movement knob covering cylinder is slidable on the protruding part of the guide cylinder, and is elastically repelled to the fine movement knob side, and from the guide cylinder. A device for preventing erroneous operation of a fine-movement knob of a surveying instrument, which is non-removably circumscribed and configured such that the other side of the fine-movement knob covering tube always covers and closes the fine-movement knob.