JPH043218Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a level reticle adjustment mechanism.

As shown in FIG. 1, a conventional automatic level is composed of three parts: an objective lens barrel 1, a main body 2, and an eyepiece lens barrel 3 that houses an automatic correction mechanism inside.
The focusing plate adjustment mechanism 4 is directly connected to the eyepiece-side lens barrel 3, and the eyepiece 5 is also screwed onto the eyepiece frame 5'. Also, although the eyepiece lens barrel 3 is protected by painting, etc., it is exposed directly to the atmosphere, so it may expand due to temperature changes.
Distortion is likely to occur due to contraction, pressure due to external force, and impact, and therefore errors in the horizontal line of sight may occur due to errors in the automatic correction mechanism housed inside, changes in the position of the focus plate, etc. caused by the above. become. Therefore, it is complicated to constantly adjust the focus plate up and down using the focus plate adjustment mechanism 4 to maintain a horizontal line of sight.

The present invention eliminates distortion of the eyepiece lens barrel due to temperature changes or external forces, and therefore prevents the automatic correction mechanism housed inside the eyepiece lens barrel or the focus plate frame from becoming distorted. The object of the present invention is to obtain a highly reliable reticle adjustment mechanism that can always provide a horizontal line of sight and eliminates the need for frequent adjustment of the reticle adjustment mechanism.

The present invention will be described below with reference to the embodiments shown in the drawings.

As shown in FIG. 2, a flange 16a provided on the front side of the eyepiece-side lens barrel 16 is fixed to the tip of the main body narrowing portion 12a provided on the main body 12. An automatic correction mechanism 13 is built into the eyepiece side lens barrel 16, and a focus plate frame 22 with a focus plate 22' attached thereto is installed in a narrowed portion 16b provided at the rear of the eyepiece side lens barrel 16. That is, as shown in FIG. 3, the focus plate frame body 22 is fixed to the other end of a spring arm 25 whose one end is fixed to the eyepiece lens barrel 16, and the focus plate adjustment screw 20 is screwed into the narrowed part 16b from the outside. The tip of the focus plate frame 22 contacts the focus plate frame 22 to enable adjustment of the focus plate frame 22, and the focus plate frame 22, spring arm 25, and focus plate adjustment screw 20 constitute a focus plate adjustment mechanism.
An outer cover cylinder 17 is provided on the circumferential surface of the narrowed part 12a of the main body 12.
A gap 14 is created between the inner surface of the outer cover tube 17 and the outer surface of the eyepiece side lens barrel 16 by screwing and fixing one side of the
forming the outer cover tube 17 and the eyepiece side lens tube 1.
Exterior to 6. The leading edge of the inner cover tube 18 is internally fitted into the open end of the outer cover tube 17. The inner cover cylinder 18 has a large diameter portion 18b that includes the internal fitting portion 18a.
The large diameter portion 1 of the inner cover tube 18 is attached to the open end of the outer cover tube 17.
The inner surface of 8b surrounds the outer periphery of a narrowed portion 16b provided at the rear of the eyepiece-side lens barrel 16. The inner fitting portion of the inner cover cylinder 18 is provided with a groove 24 having a tapered cross section surrounding the outer circumferential direction, and the tip of the fixing screw 23 passing through the outer cover cylinder 17 is connected to the groove wall of the tapered groove. Inner cover cylinder 18 so as to be in contact with
is pressed and fixed to the outer cover cylinder 17 side. An eyepiece frame 19 with an eyepiece lens 19' attached thereto is screwed and attached to the eyepiece frame attachment portion 18c of the inner cover cylinder 18. Reference numeral 21 denotes an adjustment screw operation hole provided in the inner cover tube 18 portion corresponding to the head of the focus plate adjustment screw 20, and the operation hole 21 is used when the focus plate frame 22 is assembled to the eyepiece side lens barrel 16. A pin is inserted into the pin 21, the focus plate adjustment screw 20 is rotated with the tip of the pin, and the focus plate frame 22 is moved and adjusted in the vertical direction using the spring action of the spring arm 25. 26
is a protective cover for preventing dust from entering the adjusting screw operation hole, and is externally screwed onto the large diameter portion 18b of the inner cover cylinder 16.

In the present invention having the above configuration, the protective cover 26 is screwed off, the adjustment screw operating hole 21 provided in the inner cover cylinder 18 is located at a position corresponding to the head of the focus plate adjustment screw 20, Said operation hole 2
The focus plate frame body 22 is adjusted up and down by inserting a pin (not shown) from 1 and rotating the head of the focus plate adjusting screw 20, and then removing the protective cover 2.
6 is screwed onto the large diameter portion 18b of the inner cover cylinder 18, and the adjusting screw operating hole 21 is closed with a protective cover 26.

As described above, in the present invention, the eyepiece side lens barrel narrowing portion, the focus plate, and the focus plate frame include the outer cover tube,
The inner cover tube and the protective cover form an interval and are surrounded by the inner cover tube, and the adjustment screw operating hole provided in the inner cover tube is covered and closed by the protective cover that is removably attached to the inner cover tube. The eyepiece side lens barrel is isolated from the outside air and external forces by the outer cover tube, inner cover tube, and protective cover, and is not distorted by temperature changes or external forces. Automatic correction mechanism and other mechanisms, especially the vertical position of the focus plate frame, can always maintain a horizontal line of sight without causing any deviation, and therefore there is no need to frequently adjust the focus plate frame as in the past. ,
This has the effect of providing a reticle adjustment mechanism with a high level of reliability.

[Brief explanation of the drawing]

Fig. 1 is a side view of a known automatic level, Fig. 2 is an enlarged longitudinal sectional side view of a part of the automatic level of the present invention, and Fig. 3 is an end view of the eyepiece lens barrel as seen from the focusing plate frame side. be. 12... Main body, 12a... Narrowed part of main body, 13
. . . Automatic correction mechanism, 14 . Internal fitting part, 18b...large diameter part,
18c...Eyepiece mounting portion, 19...Eyepiece frame, 19'...Eyepiece, 20...Focus plate adjustment screw, 21...Adjustment screw operation hole, 22...Focus plate frame body, 22'... ...focusing plate, 23...fixing screw,
24... Tapered groove in cross section, 25... Spring arm,
26...Protective cover.

Claims (1)

[Scope of utility model registration request] The front side of the eyepiece-side lens barrel, which has a narrowed part continuous to the large-diameter part, is fixed to the main body, an automatic correction mechanism, etc. is provided in the eyepiece-side lens barrel, and a focusing plate frame is installed in the narrowed part. The eyepiece side lens barrel and the narrowing part are surrounded by an outer cover cylinder whose one end is attached to the main body with a gap between them. and is surrounded by an inner cover cylinder attached to the open end side of the outer cover cylinder with a space formed therebetween,
The inner cover tube has an adjusting screw operation hole formed at a position corresponding to the head of the focus plate adjusting screw, and an eyepiece is attached thereto, and the operation hole is a protective cover removably attached to the inner cover tube. A level focusing plate adjustment mechanism characterized in that it is configured to be able to be closed and closed by.