JPH06102045A - Brake unit for plumb bob - Google Patents

Abstract

PURPOSE:To obtain a brake unit for plumb bob comprising two pendulums having fulcrums at vertically different points in which suspension thread stands still quickly upon collision of two pendulums and vibration of the suspension thread is damped quickly. CONSTITUTION:A pendulum 6 is suspended rockingly from the opposite wall faces of a housing 1 with a brake gap 7 being formed in the pendulum 6. A suspension thread 2 provided with a weight 2 or a brake rod 8 attached to the weight 3 is drooped loosely through the brake gap 7 thus constituting a brake unit for pendulum.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a braking device for down swinging in which the motion of a down thread is quickly stopped at a reference point to read the verticality of a barrel.

[0002]

2. Description of the Related Art In the conventional plumb bob, the vertical thread of the barrel is read while the bobbin thread is slightly swinging because the bobbin thread is not stationary. It required considerable skill.

For this reason, various braking devices have been developed for quickly stopping the swing of the lowering thread.

The present invention provides two pendulums whose upper and lower fulcrum positions are different from each other, and if the two pendulums collide with each other, the lowering thread can be quickly stopped, and the present invention is realized. completed.

[0005]

The gist of the present invention will be described with reference to the accompanying drawings.

A weight 3 is attached to the lower end of the thread 2 suspended in the barrel 1, and the indicator 4 of the weight 3 is adjusted to the reference point 5 to read the verticality of the barrel wall 1 '. In this braking device, the pendulum body 6 is oscillatedly hung on the opposing wall surface of the barrel 1, a braking gap 7 is formed in the pendulum body 6, and a weight thread 2 having a weight 3 attached to the braking gap 7 or Weight 3
The present invention relates to a braking device in a plumb bob, which is characterized in that a braking rod 8 hung at the lower end of the pendant is inserted and hung with a margin with respect to the braking gap 7.

[0007]

The lower thread 2 has its fulcrum located at the upper side, and since it is long, it swings slowly with a large amplitude.

Since the pendulum body 6 has a fulcrum located below the fulcrum of the lowering thread 2 and is short, it is busy and swings with a small amplitude.

Therefore, the lower rod 2 or the control rod 8 of the weight 3 provided with the weight 3 loosely fitted in the braking gap 7 in the pendulum body 6 and the pendulum body 6 collide with each other to cancel out the swinging force. The indicator 4 of the weight 3 comes to rest more quickly, and the verticality of the barrel wall 1'of the barrel 1 becomes easier to read.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The drawings show a preferred embodiment of the present invention, in which a weight 3 is attached to the lower end of a hanging thread 2 suspended in a barrel 1, and an indicator 4 of this weight 3 serves as a reference point. In a plumb bob braking device that reads the verticality of the barrel wall 1'according to 5, the pendulum body 6 is oscillatedly hung on the opposing wall surface of the barrel 1 and a braking gap 7 is formed in the pendulum body 6. The lowering thread 2 provided with the weight 3 in the braking gap 7 or the braking rod 8 hung vertically from the lower end of the weight 3 is inserted into the braking gap 7 and allowed to hang down.

The plumb bobbin 1 shown in the drawings is made of aluminum and is often of the two-stage slide type. The pendulum body 6 may also be made of plastic and the length of the arm may be adjustable.

The structure for suspending the lowering thread 2 is the same as the conventional lowering swing, so that the drawing is omitted. A large window hole 9 is formed in the opposing surface of the lower part of the barrel 1 and a transparent plastic see-through plate 10 is attached to the left and right window holes 9 so that the reference point 5 can be easily seen. The shaft 11/11 is attached to the upper part, and the upper ends of the left and right arms 6'of the metal pendulum body 6 are pivotally attached to the inner end of the shaft 11/11 via the bearings 12/12 to shake the pendulum body 6. Install freely. It is desirable that the shafts 11 and 11 can be stopped by applying pressure to the head.

The weight 3 shown in the drawing is of a type in which a pendulum body 6 is arranged at an upper position, a small-diameter braking rod 8 is vertically provided at a lower portion thereof, and an indicating portion 4 is hung. Therefore, although the solids collide with each other and the stopping effect is good, the indicator 4 and the weight 3 may be configured so as not to be clearly distinguished from each other.

[0014]

Since the present invention is constructed as described above, the position of the fulcrum is low and the length of the arm is short when the verticality of a column, panel, wall, etc. is read by standing the instrument tube in a usual manner, and the arm sways in a busy manner. Since the swinging of the moving pendulum body and the swinging of the weight, which has a high fulcrum position and the thread is long and swings slowly, and cancels each swinging action, the weight is swiftly instructed. The upper part of the upper pendulum body will stop in the correct hanging state due to the swing structure, which will allow the vertical section of the tube to be read efficiently. Since it stops the rod, it demonstrates excellent practicality by correctly pointing the vertical direction.

[Brief description of drawings]

FIG. 1 is a perspective view of the present embodiment.

FIG. 2 is an enlarged perspective view of a main part of this embodiment.

FIG. 3 is an enlarged plan view of a main part of this embodiment.

[Explanation of symbols]

 1 Instrument barrel 1 ′ Instrument barrel wall 2 Lower thread 3 Weight 4 Indicator 5 Reference point 6 Pendulum 7 Braking gap 8 Braking rod

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[Procedure amendment]

[Submission date] September 18, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction content]

A weight 3 is attached to the lower end of the thread 2 suspended in the barrel 1, and the indicator 4 of the weight 3 is adjusted to the reference point 5 to read the verticality of the barrel wall 1 '. In this braking device, the pendulum body 6 is oscillatedly hung on the opposing wall surface of the barrel 1, a braking gap 7 is formed in the pendulum body 6, and a weight thread 2 having a weight 3 attached to the braking gap 7 or Weight 3
The present invention relates to a braking device for swinging down, characterized in that a braking rod 8 attached to the above is inserted and hung down with a margin with respect to the braking gap 7.

Claims (1)

[Claims] 1. A plumb bob braking device in which a weight is attached to the lower end of a hanging thread suspended in a barrel, and the verticality of the barrel wall is read by aligning the indicator of this weight with a reference point. A pendulum body is swingably hung on the opposing wall surface of the cylinder, a braking gap is formed in this pendulum body, and a lowering thread provided with a weight in this braking gap or a braking rod hung at the lower end of the weight is provided in the braking gap. On the other hand, a braking device in a plumb bob, which is characterized in that a margin is provided for the insertion.