JPS6329205Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a plumb-stopping device for a measuring instrument that accurately indicates verticality and can quickly come to rest. The details are as follows.

Three or more swinging hanging devices such as strings or threads a
A ring-shaped resistance board 1 with a uniform weight around it is hung horizontally in a swing state, and a plumbstone 2 is placed in the center of this resistance board 1 with a small gap around it. It is characterized in that the oscillating weight 2 is brought to a standstill by the resistance that collides with the resistance plate 1.

In the drawings, symbol b is a vertical measuring device, 3 is a contact piece,
4 is a weight hanging string, 5 is an indicator line, 6 is a viewing window, 7 is a support plate, 8 and 8' are weight insertion holes, and 9 and 9' are fastening parts.

The vertical measuring device b is used to prove that the wall is vertical when the upper and lower contact pieces 3 are applied to the wall and the sharp lower end 2' of the plumb bob 2 correctly indicates the indicating line 5. It has a variety of uses and is often used as a construction tool.

In such a vertical measuring device b, unless the swinging of the plumb bob 2 stops forever, the instruction to the indicator line 5 cannot be accurately measured.

Therefore, a stopping device was needed to quickly stop the plumb bob, and a device was proposed that suspends a coil spring and positions the plumb bob at the bottom of the coil spring, as disclosed in Japanese Patent Application Laid-open No. 48-41763. It was done.

However, those using such coil springs,
The repulsive force of the coil spring differs depending on the direction in which the plumb bob strikes.

This has a serious effect on stopping the plumb bob, and if the repulsive force differs depending on the direction of collision, it will be impossible to stop the plumb bob quickly.

In addition, since the coil spring tends to expand and contract in the vertical direction, if the coil spring expands or contracts even a little due to a collision with the plumb bob, this action will also go against the effect of trying to stop the plumb bob.

In this regard, the present invention suspends a ring-shaped resistance board 2 with a uniform weight around it in a swing state using three or more swinging hanging devices 1 such as strings or threads. Since the plumb bob 3 is positioned at the center of 2 with a small gap around it, the repulsive force received from the resistance plate is uniform no matter which direction the plumb bob 3 hits.
Moreover, since the resistance plate 2 only swings horizontally and does not move vertically, the plumb bob 3 can be stopped quickly.

Furthermore, since the plumb bob 2 ultimately stops in a free state, instructions to the indicating line 5 can be given completely accurately, making it a practically excellent plumb bob stopping device in a measuring instrument.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of the vertical measuring device of the proposed product, and Fig. 2 is an oblique view of the main parts. a... Hanging tool, 1... Resistance board, 2... Plumb weight.

Claims (1)

[Scope of utility model registration request] A ring-shaped resistance board with a uniform weight around it is hung horizontally in a swing state using three or more swinging hanging devices such as strings or threads, and a plumbstone is placed in the center of this resistance board. A plumb-stopping device for a measuring instrument, characterized in that it is positioned with a small gap around the periphery, and the swinging weight is brought to a standstill by the resistance that collides with a resistance plate.