JPH0543376Y2 - - Google Patents

Description

[Detailed explanation of the invention] ``Field of application of the invention'' This invention is a fine movement device for rotating the direction of a telescope in surveying instruments such as theodolites and leveling instruments by a minute amount to position it in an accurate direction, especially a fine movement knob. This invention relates to a tightening device in a fine movement device in which a tightening knob and a tightening knob are disposed on the same axis.

``Problems to be solved by conventional technology and inventions'' This kind of conventional tightening device has a hollow part from which the rear end of the push rod protrudes at the tip of the actuating arm, and the tightening force is applied to the side of the actuating arm. The introduction shaft is screwed in so that its tip can protrude into the cavity, and the rear end surface of the push rod is formed into a slope so that it approaches the tip of the adjustment screw as it goes from the installation side of the tightening force introduction shaft to the front side. A steel ball is placed between the rear end face and the tip of the tightening force introducing shaft, the tightening shaft is connected to the rear end of the tightening force introducing shaft via a universal joint, and by rotating the tightening shaft, tightening is performed via the universal joint. There is a known device in which a force introduction shaft is rotated and an operating arm is fixed via a steel ball, a push rod, and a tightening piece, and in this state fine rotational operation of a surveying instrument is performed. It was found that when the tightening force introducing shaft is released, there is a slight play between the tip and the steel ball, which causes unnecessary slight rotation in the surveying instrument during the tightening operation.

"Means for Solving the Problems" In order to solve the above-mentioned conventional problems, this invention interposes a cup-shaped support crown between the side surface of the operating arm around the tightening force introduction shaft and the tip of the tightening shaft, and this support By connecting the tightening force introduction shaft to the support crown so that it can move forward and backward, and by connecting the support crown and the tightening shaft via a universal joint, the operating arm and the tightening shaft are connected to the support crown regardless of whether the tightening force introduction shaft moves forward or backward. so that they are always at a constant distance through
This paper proposes a device that prevents the slight movement of a surveying instrument during micro-motion operations.

``Example'' Below, an example of this invention shown in the drawings will be described.A main body casing 1 of a surveying instrument equipped with a telescope is rotatably supported on a bearing 3 about a central axis 2. A tightening ring 4 is rotatably attached to the holder.

An operating arm 5 is provided on a part of the outer periphery of the tightening ring 4 in a manner perpendicular to the central axis 2 and protrudes from a portion thereof.
A recess 6 is provided in the inner circumference of the tightening ring 4 at the base of the tightening ring 4 , and a tightening piece 7 is disposed within the recess 6 .
It is fitted so that it can move forward and backward slightly in the diametrical direction.
A through hole 8 is formed inside the actuating arm 5 and communicates with the recess 6 in the direction in which it protrudes, and a push rod 9 is inserted into the inside so that it can move forward and backward. A screw hole-shaped cavity 10 is formed to communicate with each other.

An adjustment screw 11 is screwed into the opening of the cavity 10, and a tightening force introducing shaft 12 is screwed into the side surface perpendicularly to the push rod 9.

The push rod 9 is configured such that a key pin 14 engages with an axially long key groove 13 provided on the outer periphery and slides in the axial direction without rotating, and has a rear end surface 9' protruding into the bottom of the cavity 10. is formed on a slope so as to approach the tip of the adjustment screw 11 from the mounting side of the tightening force introduction shaft 12 toward the front side thereof.

Further, inside the bottom of the cavity 10, a steel ball 15 is connected to a push rod 9, an adjustment screw 11 and a tightening force introducing shaft 1.
It is held in contact with each end face of 2 on three sides of the periphery.

A fine adjustment screw 16 and a tightening shaft 17 are coaxially disposed in a portion of the main casing 1 facing the rear end of the tightening force introducing shaft 12 .

The fine adjustment screw 16 is formed into a hollow tube shape with a male thread 16 on the outer periphery, and is inserted into the receiving hole 18 of the main body casing 1.
Screw receiver 20 fitted with and fixed with set screw 19
It is screwed into a screw hole 20' and moved forward and backward in the axial direction by rotating a fine adjustment knob 21 attached to the rear end, and a tightening shaft 17 is rotatably inserted into the hollow part of the shaft center. has been done.

The tightening shaft 17 has a distal end 17' that protrudes from the distal end of the fine adjustment screw 16 and is formed into a hemispherical or conical shape, and a flange-like locking part 22 is provided at the base end of the distal end 17'. This locking portion 22 is rotatably locked to the tip of the fine adjustment screw 16 via a sliding ring 23 fitted around the tightening shaft 17 at the rear thereof, and a tightening knob is provided at the rear end. 25 is attached and locked.

A rotation stop pin 2 is provided on a part of the outer periphery of the locking portion 22.
6 is provided to protrude in the radial direction, and a locking guide portion 27 is provided to protrude in the radial direction from a part of the outer periphery of the sliding ring 23.

The tip of the screw receiver 20 is provided with regulating protrusions 28, 28' that are abutted against a stopper 26 that rotates together with the tightening shaft 17 to regulate its rotation within a certain range.
Furthermore, a groove-shaped guide 29 is provided which engages the locking guide portion 27 of the sliding ring 23 so as to be slidable in the forward and backward direction of the fine adjustment screw 16 and locked in the rotating direction of the sliding ring 23. ing.

The tightening shaft 17 is connected to the tightening force introduction shaft 12 by a universal joint 30 at its distal end 17'.

The universal joint 30 has a symmetrical long hole or notch 32 such as a hook-shaped hole in the rear part of the sleeve 31, and a pair of long holes 3 in the front part 90 degrees out of phase with the notch 32.
3 are provided parallel to the advancing and retreating direction of the fine adjustment screw 16, and are connected to the tightening force introducing shaft 12 via a cup-shaped support crown 34.

The support crown 34 is arranged such that the circumferential surface of its tip opening abuts the side surface of the actuating arm 5 around the tightening force introduction shaft 12 and the flat rear end surface abuts against the sharp tip of the tightening shaft 17. 5 and the tightening shaft 17, and the rear end of the tightening force introduction shaft 12 is fitted into the tip opening so as to be freely retractable.

The support crown 34 has a pair of pins 35 protruding symmetrically on its circumferential surface that are slidably engaged with the elongated holes 33 of the sleeve 31, and are 90 degrees out of phase with the pins 35 to introduce a tightening force. The sleeve 31 and Tightening force introduction shaft 1
2 are connected so that they can be bent and moved forward and backward.

The tip 17' of the tightening shaft 17 is inserted into the rear end of the sleeve 31, and the sleeve 31 and The tightening shaft 17 is connected so that it can be bent and moved back and forth, thereby transmitting the rotational force of the tightening shaft 17 to the tightening force introducing shaft 12. A cylindrical elastic support 40 attached to the main body casing 1 is in pressure contact with the side surface of the other end of the operating arm 5 via a compression spring 41 therein.

Therefore, the actuating arm 5 is supported at the tip of the tightening shaft 17 via the support crown 34 at a constant distance by the elastic force of the elastic support 40.

Stoppers 42 and 43 for preventing overtightening are provided on opposing surfaces of the screw receiver 20 and the fine adjustment knob 21.

``Effect of the invention'' In the above configuration, when aiming the telescope of the surveying instrument, first loosen the tightening knob 25 and turn the telescope together with the rotatable main body casing 1 in the target direction. After positioning in a direction close to , the tightening knob 25 is rotated in the fixed operation direction.

As a result, the tightening shaft 17 rotates within the fine adjustment screw 16, and the tightening force introduction shaft 12 is rotated and advanced via the universal joint 30 at the tip.

When the tightening force introducing shaft 12 moves forward, its tip presses the steel ball 15 forward, and the steel ball 15 slides on the sloped rear end surface 9' of the push rod 9, so that the push rod 9 moves in the tip direction. The operator moves forward to tighten the tightening piece 7 to the bearing 3, and fixes the actuating arm 5 integrally with the bearing 3.

In this case, since the contact between the steel ball 15 and the inclined rear end surface 9' of the push rod 9 can be adjusted by tightening the adjustment screw 11, the tightening piece 7, the rear end surface 9' of the push rod 9, and the steel ball Even if there are variations in the accuracy of 15 etc., reliable tightening operation can be ensured, and there is no fear that the tightening will loosen.

Furthermore, even if the tightening force introducing shaft 12 moves forward due to the tightening operation of the tightening knob 25, the actuating arm 5 is supported by the tip of the tightening shaft 17 via the support crown 34, so that the operating arm 5 is not connected to the main body casing 1. There is no change in position relative to the actuating arm 5, and it is possible to prevent the main body casing 1 from moving slightly during the tightening operation, and the same holds true when the tightening is released.

Furthermore, the rotation range of the tightening shaft 17 is
6 and the regulating protrusions 28, 28' that lock this, the tightening force introducing screw 12 is regulated to the minimum required range for tightening and releasing, thereby preventing the tightening shaft 17 from being over-tightened or loosened too much. can do.

With the actuating arm 5 tightened around the central shaft 2 in this manner, when the fine adjustment screw 16 is rotated to the right or left using the fine adjustment knob 21 to advance or retreat, the tightening screw 17 simultaneously advances or retreats. fall back.

In this case, a sliding ring 2 that is prevented from rotating is provided between the tip of the fine adjustment screw 16 and the locking portion 22 of the tightening shaft 17.
3 is interposed, the rotational force of the fine adjustment screw 16 is not transmitted to the tightening shaft 17, and it is possible to reliably prevent the tightening of the actuating arm 5 from being released due to the rotation of the tightening shaft 17 during the fine adjustment operation.

When the fine adjustment screw 16 moves forward, the tip of the tightening shaft 17 that moves forward pushes out the operating arm 5 via the bearing crown 34, but the operating arm 5 is fixed integrally with the bearing 3 as described above. Therefore, the main body casing 1 slightly rotates around the central axis 2 using the operating arm 5 as a reaction wall (clockwise in FIG. 1).

On the other hand, when the fine adjustment screw 16 retreats, the tightening shaft 17 integrated with it retreats and tries to separate from the actuation arm 5 via the support crown 34, but it comes into elastic contact with the other side of the actuation arm 5. The elastic support body 40, which is attached to the bearing 3, uses the actuating arm 5 fixed to the bearing 3 as a reaction wall, and its spring 41 presses the main body casing 1 in the right direction in FIG. 17 is pulled back to the operating arm 5 side together with the main body casing 1, and as a result, the main body casing 1
rotates slightly in the counterclockwise direction in FIG.

In this way, by rotating the fine movement knob 21 left and right, the main body casing 1 can be slightly rotated left and right, and the telescope attached thereto can be accurately sighted in the target direction.

In this case, as the body casing 1 rotates, the tightening shaft 1 relative to the tightening force introducing shaft 12
7 angular displacement occurs, but the two are connected in a flexible manner by the universal joint 30, and the tightening shaft 1
7 is in pressure contact with the support crown 34 at its sharp tip so that the angle can be freely changed, so that it can smoothly follow the angular displacement.

Further, since the fine adjustment knob 21 is formed to have a larger outer diameter than the tightening knob 25, delicate fine adjustment can be easily performed.

"Effect of the invention" As described above, according to this invention, a fine adjustment screw is screwed into the screw receiver provided in the main body casing in front of the tightening force introduction shaft, and the tightening shaft is supported inside the fine adjustment screw so that it can rotate freely but cannot move forward or backward. The rear end of the tightening force introduction shaft is fused to a cup-shaped support crown in which the peripheral surface of the tip opening is in contact with the side surface of the actuating arm around the tightening force introduction shaft, and a pin is attached so that the rear end of the tightening force introduction shaft can move forward and backward in the axial direction. The support crown and the tip of the tightening shaft are connected via a universal joint, and the sharp tip of the tightening shaft is brought into contact with the rear end surface of the support crown, so that the actuating arm moves the tightening force introduction shaft forward and backward. Regardless of the operation, it is always supported at the tip of the tightening shaft via the support crown at a constant distance, and even if the tightening force introducing shaft advances due to tightening operation, the main body casing of the surveying machine There is no change in the relative position of the arm and the actuating arm, and it is possible to reliably prevent the surveying instrument from moving slightly during the tightening operation.

[Brief explanation of the drawing]

FIG. 1 is a partial longitudinal sectional plan view showing an embodiment of this invention, and FIG. 2 is a vertical sectional front view of the tip of the tightening shaft. 1... Main body casing, 5... Operating arm, 7
...Tightness frame, 9...Putshurotsudo, 12...
Tightening force introducing shaft, 15... Steel ball, 16... Fine adjustment screw, 17... Tightening shaft, 20... Screw receiver, 22...
...Locking portion, 23...Sliding ring, 26...Stopper, 27...Locking guide portion, 28, 28'...
Regulatory convex portion, 29... Guide, 30... Universal joint,
31... Sleeve, 32... Notch, 33... Long hole, 34... Support crown, 35... Pin, 36... Long hole, 37, 38... Pin.

Claims (1)

[Claims for Utility Model Registration] 1) In a device for tightening an actuating arm via a tightening piece by advancing a push rod by the forward force of a tightening force introducing shaft screwed into the side of the actuating arm, the tightening force is A fine adjustment screw is screwed into a screw receiver provided in the main body casing in front of the introduction shaft, a tightening shaft is supported rotatably but not forward or backward at the axis of the fine adjustment screw, and a side surface of the actuating arm in the vicinity of the tightening force introduction shaft is provided. The rear end of the tightening force introduction shaft is fused to a cup-shaped support crown whose distal opening circumferential surface is in contact with the support crown, and the rear end of the tightening force introducing shaft is connected with a pin so as to be freely advanced and retracted in the axial direction, and the support crown and the tightening shaft A tightening device for a fine movement device of a surveying machine, characterized in that the tip ends of the tightening shaft are connected via a universal joint, and the sharp tip of the tightening shaft is brought into contact with the rear end surface of the support crown. 2) A utility model registration request characterized in that a stopper is provided around the tip of a tightening shaft protruding from the tip of a fine adjustment screw, and a regulating protrusion is provided around the rotating part of the stopper to regulate the rotation range of the stopper. A tightening device in a fine movement device of a surveying machine according to scope 1. 3) A locking part is provided around the base end of the tip of the tightening shaft protruding from the tip of the fine adjustment screw, a sliding ring is inserted between this locking part and the tip of the fine adjustment screw, and the outer circumference of the sliding ring is A fine movement of a surveying instrument according to claim 1 or 2 of the registered utility model claim, characterized in that a part of the part is slidably engaged with a guide provided in parallel to the advance/retreat direction of the fine movement screw. Tightening device in equipment.