JPH0435764Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Industrial field of application] This invention automatically allows horizontal light to enter the eyepiece by keeping the main body of a surveying instrument, such as an automatic level or theodolite, in a substantially horizontal state. The present invention relates to a protection device for an automatic horizontal correction mechanism having a pendulum structure.

[Prior Art] Conventionally, in the pendulum-structure automatic horizontal correction mechanism of surveying instruments, when the surveying instrument body is tilted too much,
If the pendulum of the correction mechanism swings too much and moves more than necessary, it will put a heavy burden on the four hanging wires that suspend the pendulum, which may cause a number of malfunctions such as the hanging wires breaking or coming off. Protective devices were installed to restrict movement.

Regarding this protection technology, a technology has been proposed that uses screw feet to restrict the movement of the pendulum.

For example, there is a technique that uses a pendulum movement limiting member in a metal frame as shown in FIGS. 2A and 2B. According to this, the movement range of the pendulum 31 is restricted by the restriction members 33 attached to the restriction member mounting frame 30 on both sides of the pin 32 attached to the pendulum 31, and the restriction members are moved around the screw 34 as an axis. 33
By rotating and moving the pendulum 31, the range of movement of the pendulum 31 can be adjusted.

There is also a technique disclosed in Japanese Patent Publication No. 57-34887. The technique proposed in this Japanese Patent Publication No. 57-34887 is as shown in Fig. 3, in which a linear limiting member is stretched, and according to this technique, both sides of the pin B attached to the pendulum are bullet line 49
The pendulum is configured to limit movement of the pendulum within a predetermined limit range. The limit range is adjusted with an adjustment screw 45, and the tension of the bullet 49 is adjusted with a screw 48. Note that the code 40 is the outer frame, and the code 47
is a mounting screw.

Furthermore, Japanese Utility Model Application No. 61-184909 proposes a technique in which a pair of leaf spring members that deform in the swinging direction are arranged as limiting members at a predetermined distance from the frame of the pendulum in the swinging direction of the pendulum. has been done.

[Problems to be solved by the invention] According to the prior art shown in FIGS. 2A and 2B, when the protection device of the automatic horizontal correction mechanism functions, the pendulum and the pendulum movement restriction member that are in contact with each other are An adhesion phenomenon occurs, where the person gets stuck and cannot leave.
There is a problem in that it impairs the surveying function. Further, if the pin and the pendulum movement limiting member repeatedly collide with each other, there is a problem that dents, scratches, cracks in the plating, etc. occur with each other.

Furthermore, in the technique of stretching the linear limiting member 49 proposed in Japanese Patent Publication No. 57-34887, the limiting member 49 is
Since the wire 9 is tensioned with support at both ends, a means for adjusting the tension of the wire is required, and a large space is required within the surveying instrument.

Furthermore, the technology proposed in Japanese Utility Model Application Publication No. 184909/1984 uses a U-shaped leaf spring that deforms in the swinging direction as a limiting member and is placed on the side of the frame. A space for arranging the leaf spring, adjustment screws, etc. is required on the side of the body, which is inconvenient for downsizing the device. And with this technology,
The abutment part of the leaf spring and the frame make surface or line contact, which may cause a sticking phenomenon. There is a problem that not only is it necessary to adjust the spring force of the leaf spring, but also that the installation of the leaf spring is troublesome.

This idea was made to solve the above problem, and it is an automatic horizontal correction mechanism protection device for surveying instruments that can prevent pendulums from sticking with a simple configuration, is easy to install, and requires little installation space. The technical challenge is to provide

[Means for Solving the Problems] In order to solve the above-mentioned technical problem, the automatic horizontal correction mechanism protection device for a surveying instrument according to the present invention provides a device for protecting an automatic horizontal correction mechanism for a surveying instrument using a pendulum. In this case, two pins are formed at the upper end part away from the center of gravity, and one end is fixed and the other end is a free end at the upper surface side of the mounting plate that is engaged with the surveying instrument body on both sides of the pin's swing direction. cantilevered with 2
Two elastic rods are arranged to face each other via two pins formed at the upper end of the pendulum, and the free end side of the elastic rods comes into contact with the pins when the surveying instrument is tilted.

Further, it is preferable to form the elastic rod by bending the free end of the elastic rod toward the pin at a position closer to the pendulum than the pin.

[Function] As described above, in the present invention, the two elastic rods serving as blocking members are only cantilever-supported at one end at the upper surface side of the mounting plate engaged with the main body of the surveying instrument. The arrangement and adjustment of the elastic rods of
This can be done on the top surface of the mounting plate, which is extremely simple. In addition, since it is a rod, there is no need to provide tension at both ends, and it does not take up installation space like a U-shaped leaf spring. Further, one end of the elastic rod is a free end, and when the pin of the pendulum and the elastic rod collide, the elastic rod side bends a small amount, so that the impact can be absorbed during the collision.

Furthermore, the pin of the pendulum is located at the top end of the pendulum, away from the center of gravity of the pendulum.
When the pin of the pendulum and the elastic rod make contact, they form an unstable point contact, and the pin and the elastic rod separate due to slight vibrations.In addition to preventing the pendulum from sticking, the pendulum can also be stopped using a braking device (not shown). can.

Note that if the free end of the elastic rod is bent toward the pin at a position closer to the pendulum than the pin, a buffering effect can also be exerted against the movement of the pendulum pin in the direction of the mounting plate.

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 shows a first embodiment of the present invention, and in the figure, reference numeral 1 is a pendulum;
Mounting plates 10 are movably mounted on both sides of the mounting frame 16 with mounting screws 12 . The mounting frame 16 is formed on the main body of the surveying instrument (not shown).

In addition, at the upper end of the pendulum 1, which is far from the center of gravity, there are 2
Two cylindrical pins 2 are attached, and these two pins swing together with the pendulum 1. On both sides of the two pins 2 in the swinging direction X, two opposing elastic rods 11 are disposed with the two pins 2 interposed therebetween. One end of these elastic rods 11 is attached to the mounting plate 1
0 and a screw 13 via a washer 15, the other end is a free end. The elastic rod 11 in this example is a round rod made of a spring material, as shown in FIG. 1A. The fixed end is U-shaped so that it can be hung on the screw 13,
The free ends of the elastic rods 11 are bent toward the pin 2 at positions closer to the pendulum than the pin 2. This has the effect of damping the movement of the pendulum pin in a direction perpendicular to the movement in the X direction (i.e. in the direction of the mounting plate).

According to this example, the movement of the pendulum 1 can be suppressed within a predetermined range using only the pair of elastic rods 11.

The range of movement of the pendulum 1 is adjusted by loosening the screws 12 fixing the mounting plate 10, rotating the mounting plate 10 around the screws 12, and moving the elastic rod 11.

In this example, even if a strong impact or heavy load is applied to the surveying instrument, the free end of the elastic rod 11 is bent.
The pin 2 will not deviate from the arrangement range of the elastic rod 11. Normally, when the pendulum 1 moves beyond a predetermined range, one of the pins 2 makes point contact with the elastic rod 11, and the action of these two pins causes a force to be applied to the elastic rod 11.
When the reaction force of the pendulum 1 is balanced with the reaction force of the elastic rod 11, the pendulum 1 loses its kinetic energy and is separated by the reaction force of the elastic rod 11. At this time, the other pin 2 moves in the opposite direction, and the contact between the contact side pin 2 and the elastic rod 11 is severed. In other words, the sticking phenomenon between the pin of the pendulum and the elastic rod is caused by the fact that the pin is located at the upper end of the pendulum, which is far from the center of gravity. It is possible to separate by vibration and eliminate the sticking phenomenon. Further, the elastic rod 11 can also serve as the movable range of the pendulum, that is, the correction range of the automatic horizontal correction mechanism.

In the above embodiment, an example was shown in which the elastic rod was made of a spring material, but the material is not limited to the spring material, and any other material such as a synthetic resin material may be used as long as the rod has a predetermined elasticity.

[Effects of the invention] The present invention is constructed as described above, and the elastic rods are only cantilever-supported at one end at the upper surface side of the mounting plate engaged with the main body of the surveying instrument. The space for arranging the elastic rods is small, and the device can be made more compact. In addition, each elastic rod can be arranged and adjusted on the upper surface of the mounting plate, which is extremely simple. The two elastic rods are cantilevered and fixed, and the two pins provided apart from the center of gravity at the upper end of the pendulum make point contact with each other, making the contact between the pins and the elastic rods unstable. This prevents the pendulum from sticking, and allows the pendulum's movable range, ie, the correction range of the automatic horizontal correction mechanism, to also serve as an elastic rod.

In addition, the pin of the pendulum and the free end side of the elastic rod contact each other, and when they collide, it bends a small amount, so the impact when it collides with the pin can be absorbed, resulting in dents, scratches, and cracks in the plating of the elastic rod. can be prevented. Furthermore, there is no need to provide tension as in the case of both end support tensions, and the pin provided at the top of the pendulum is regulated by an elastic rod, so the protective device can be installed in a small space.

Furthermore, if the free ends of the elastic rods are bent toward the pin at positions closer to the pendulum than the pin, then
It can also act as a buffer against movement in the direction of the mounting plate.

[Brief explanation of drawings]

Fig. 1 shows a first embodiment of the present invention, Fig. 1A is a schematic plan view, Fig. 1B is a partial sectional view taken along the - line in Fig. 1A, Fig. 2A is a schematic plan view of the conventional example, and Fig. 2B The figure is a partial sectional view taken along the - line in FIG. 2A, and FIG. 3 is a plan view of the main part of another conventional example. 1... Pendulum, 2... Pin, 10, 20... Mounting plate, 11, 21... Elastic rod, 12, 13... Mounting screw.

Claims (1)

[Claims for Utility Model Registration] 1. In a surveying instrument equipped with an automatic horizontal correction mechanism using a pendulum, the pendulum has two pins formed at its upper end remote from the center of gravity, and two pins are formed on both sides of the pin in the swinging direction. Two pins formed at the upper end of the pendulum support two elastic rods that are cantilevered, one end of which is fixed and the other end of which is free, at the upper surface of the mounting plate engaged with the surveying instrument body. An automatic horizontal correction mechanism protection device for a surveying instrument, characterized in that the elastic rods are arranged opposite to each other via the pins, and the free end side of the elastic rod comes into contact with the pin when the surveying instrument is tilted. 2. The automatic horizontal correction mechanism protection device for a surveying instrument according to claim 1, wherein the free end of the elastic rod is bent toward the pin at a position closer to the pendulum than the pin.