JPS6236085Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a support structure for a horizontal axis in an angle measuring device such as a theodolite.

An angle measuring device such as a theodolite has a structure in which a horizontal axis such as an ear axis is provided in the main body that houses the collimating optical system, and the horizontal axis is swingably supported on a support frame. As the bearing, a sliding bearing is used to maintain measurement accuracy. Plain bearings come in two shapes, such as round metal bearings and split metal bearings, but because these bearings directly hold the horizontal shaft, the precision of the fit between the bearing metal and the horizontal shaft is extremely high. Must be;
Therefore, there is a problem in that the machining accuracy of each of the horizontal shaft and the bearing must be extremely high. If the fitting accuracy between the horizontal shaft and the bearing is low, not only will the measurement accuracy decrease, but also play will occur in the horizontal shaft. In addition, when heavy objects such as optical rangefinders are attached to the theodolite telescope, as has been frequently used in recent years, the uneven load applied to the horizontal axis may cause problems such as galling of the axis. . When such a malfunction occurs, it becomes necessary to replace the bearing in order to repair the problem, and in particular, it becomes necessary to replace all the horizontal shafts as well.

The present invention aims to solve these problems in conventional angle measuring devices.

That is, in the present invention, horizontal shafts protruding from both sides of the main body housing the collimating optical system are swingably supported by the support frame by ball bearings.
When using a ball bearing as a bearing, a problem arises in that the rotation becomes too light. In other words, if the rotation of the main body housing the collimating optical system becomes too light, the center of gravity may change just by rotating the focusing lens inside the main body, and the main body may rotate. In order to solve the above-mentioned problem, a rotation suppressing device is provided on the ball bearing supporting the horizontal shaft. The rotation suppressor is
Although it may be constructed by sealing a lubricating oil or a solid lubricant with an appropriate viscosity into the ball bearing, in a preferred embodiment, the contact pressure member is applied to a movable part such as the inner ring or ball of the ball bearing with an appropriate pressure. make contact with it. This contact pressure member is made of an elastic member, and is screwed to the support frame via a spring washer or the like, so that the contact pressure of the contact pressure member can be adjusted by adjusting the tightening force of the screw. preferable. If an annular compression spring is used as the elastic member, the outer circumference of the spring is attached to the support frame, and the inner circumference is placed in pressure contact with the inner ring of the ball bearing, this elastic member also acts as a dust-proof seal for the bearing. You can have it. Further, the elastic member may be made of nitrile rubber or the like and may be brought into contact with the balls of the bearing.

When using a self-aligning type bearing, the contact pressure member should be configured so that it contacts the movable part evenly from both sides of the bearing in order to avoid impairing the self-aligning function. is desirable.

Hereinafter, an embodiment of the present invention will be explained with reference to the drawings. In Fig. 1, a main body containing a collimating optical system, that is, a lens barrel 1 of a telescope, has a horizontal axis 2 such as an ear axis projecting from both sides. This horizontal shaft 2 is supported by a support frame 4 via a ball bearing 3. The ball bearing 3 has an outer ring 3a
is attached to the support frame 4, and a horizontal shaft 2 is attached to the inner ring 3b.
are fitted and bonded. An inner wall 4a is formed on the support frame 4 on the lens barrel 1 side, and the inner and outer rings of the bearing 3 are brought into contact with this inner wall 4a. An annular presser spring 5 is attached to the outer surface of the support frame 4 with a screw 7 via a spring washer 6. The inner periphery of the pressing spring 5 contacts the end surface of the inner ring 3b of the bearing 3 and provides rotational resistance to the inner ring 3b. The contact pressure of the pressing spring 5 against the inner ring 3b can be adjusted by adjusting the tightening force of the screw 7.

In the embodiment shown in FIG. 2, a contact pressure member 15 made of nitrile rubber is attached to the support frame 4 with a screw 17 via a spring washer 16, and the inner peripheral edge of the contact pressure member 15 is connected to the ball of the bearing 3. 3c
The ball 3c comes into contact with the ball 3c to provide rotational resistance to the ball 3c.
FIG. 3 shows an example in which a self-aligning ball bearing 23 is used as the bearing.
contact c. Incidentally, such a contact pressure member may be omitted and a filler having an appropriate viscosity may be filled in the bearing 23. As a filler, the viscosity is 450~ at 40℃.
A solid lubricant such as 550 cst gear oil, silicone or Teflon is suitable.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view showing an embodiment of the present invention;
FIG. 2 is a similar sectional view showing another embodiment, and FIG. 3 is a sectional view showing still another example. 1... Main body, 2... Horizontal shaft, 3... Ball bearing, 4... Support frame, 5... Contact pressure member, 6...
Spring watch.

Claims (1)

[Claims for Utility Model Registration] (1) In an angle measuring device in which a horizontal axis is provided protruding from both sides of a main body housing a collimating optical system, and the horizontal axis is swingably supported on a support frame, the horizontal axis is An angle measuring device characterized in that a ball bearing is interposed between the horizontal axis and the support member, and a rotation suppressing device for adjusting rotational torque is provided on a movable part of the ball bearing that moves with the rotation of the horizontal shaft. (2) In the above item 1, the rotation suppressing device is an angle measuring device comprising a contact pressure member that contacts a movable part of a ball bearing. (3) The angle measuring device according to item 2, wherein the contact pressure member is an elastic member. (4) In the above item 3, the contact pressure member is screwed to the support frame via a spring washer, and the contact pressure of the contact pressure member is adjusted by adjusting the tightening force of the screw. Natsuta angle measuring device. (5) The angle measuring device according to item 3 or 4, wherein the elastic member is an annular pressing spring. (6) The angle measuring device according to item 3, wherein the elastic member is made of nitrile rubber. (7) In the above item 1, the rotation suppressing device is an angle measuring device comprising a filler sealed in a bearing.