US2131357A

US2131357A - Torsion balance

Info

Publication number: US2131357A
Application number: US151120A
Authority: US
Inventors: Rech Erich
Original assignee: Individual
Current assignee: Individual
Priority date: 1935-08-13
Filing date: 1937-06-30
Publication date: 1938-09-27
Anticipated expiration: 1955-09-27

Description

Sept. 27, 1938. REEH 2,131,357

TORSION BALANCE Filed Jun 30, 1937 Patented Sept. 27, 1938 TORSION BALANCE Erich Reeh, Hanover, Germany Application June 30, 1937, Serial No. 151,120 In Germany August 13, 1935 5 Claims.

This invention relates to improvements in torsion balances, more especially in connection with the pendants of such balances.

In the casings of the usual torsion balances special movable members are mounted by means of which the pendant is lifted to a position in which it is secured against motion in relation to the casing.

The motion of these members requires further wearisome devices, because the members engaging the pendant must be operated simultaneously and uniformly in order to avoid undesired stresses of the most sensible torsion balance.

When the torsion balance is to be taken into pieces, for instance, for cleaning purposes, these different members render the disconnection and the remounting of the balance very difficult.

According to this invention either the casing, or (if the casing is composed of several boxes or frames) the boxes or frames are made removable with relation to the other part of the balance, and members are attached to the stationary part of the balance holding the pendant fast in its position when, as a result of the mutual displacement of the casing and the balance, the pendant has advanced so far as to touch the casing.

The invention is illustrated by way of example in the annexed drawing of which Fig. 1 represents a Vertical cross-section of the frame, the casing and that part of the balance, in which the pendant is mounted. Fig. 2 is a cross-section of the casing on the line AB of Fig. 1. Fig. 3 is a fractional cross-section similar to Fig. 1, showing the balance in the position in which the pendant is secured against motion. Fig. 4 is a side elevation with part of the frame in vertical crosssection.

In the figures, d is the casing and b the pendant. c is a cylindric hollow body firmly fixed to the balance in which body the casing a is prepared to slide. (1, d are the pins for holding the pendant, which pins may be guided by the casing. e are springs by which the pressure of the pins d on the beam is softened. 1 is the bottom of the casing a. g is a pinion operated by hand with the lever i and meshing with a rack h attached to the casing a. The pinion g is journaled in bearings fixed to the frame It carrying slide bars I operating with slide faces m provided on the casing a.

When the balance is to be brought from the position shown in Fig. 1 into that shown in Fig. 3, the casing a. is shifted upwards in the cylindric hollow body 0 until the bar b rests on the bottom 1 of the casing. By this displacement the pins (1, cl have entered the chamber of oscillation, as they have not participated in the displacement, and thus the pins come into contact with the bar I) so that the pendant is secured against motion in the casing a. The degree of the displacement may be determined by abutments provided upon the casing or the cylindric body 0 corresponding to the two end positions of the movable part.

Preferably the arrangement may be such that on lifting the casing a the bottom 1 of the casing comes into contact with the'beam b (see Fig. 3) before the pin (1 touches the bar I). Hereby I attain that on the lowering of the casing a the bar 12 is already released from the pins d when the bottom of the casing is detached from the bar b whereby the sudden shock is avoided to which otherwise the pendant would be subjected when unlocking the balance, which shock could tear the torsion filament.

The insertion of the springs e, e prevents dam-.

aging the beam by too hard a stroke of the pins d and permits of a fine. play when fixing the beam Without its being damaged or without a slight mobility of the beam being retained.

I claim:

1. In a torsion balance, a frame, a hollow body attached to this frame, a casing vertically displaceable in the hollow body, a beam in the casing, a filament fixed with one end to the hollow body and with the other end to the beam in such a manner that the beam is freely suspended in the one end position of the casing and in the other end position is supported by the wall of the casing.

35 2. In a torsion balance, a frame, a hollow body attached to this frame, a casing vertically displaceable in the hollow body, a beam in the casing, a filament fixed with one end to the hollow body and with the other end to the beam in such a manner that the beam is freely suspended in the one end position of the casing and in the other end position is connected with the casing by clamping.

3. In a torsion balance, a frame, a hollow body fixed to the frame, a casing vertically adjustable in the said body, a beam in the casing, a filament fixed with one end to the hollow body and with the other to the beam, and pins penetrating'the wall of the casing and reacting against said frame upon vertical adjustment of said casing to clampingly, engage the beam.

4. In a torsion balance, a frame, a hollow body fixed to the frame, a casing vertically adjustable in the said body, a beam in the casing, a filament 55 carrying the beam in slanting position, and pins penetrating the wall ofthe casing and reacting against said frame upon vertical adjustment of said casing to clampingly engage the beam, the

distance between the bottom of the casing and 5 the lower end of the beam being smaller than the distance between the ends of the pins and the beam.

ERICH REEH.