Electrostatic System For Generating Periodical Mechanical Vibrations

Abstract

The present invention concerns means for generating periodical mechanical vibrations by means of electric energy, and deals with a greatly simplified and efficacious swing system, which produces mechanical vibratory movements, which system dispenses with any active elements or components except for an energy or current source or cell, the energy losses produced by ohmic resistances in the system being reduced to a minimum and resulting in a high degree of efficiency, reliability and accurate performance.

Description

Two or more electrodes are arranged to constitute a mechanical oscillating or swinging arrangement of which at least one electrode is resiliently supported and is capable of flexing and swinging along a predetermined length of an oscillating course and direction toward and away from the other electrode or electrodes; a charge compensation in condenser fashion occurring when selected ones of said electrodes approach each other closely enough, within an electric field established between said electrodes. In the position of rest said electrodes are sufficiently remote or spaced from each other, but are aligned with their frontal faces confronting each other.

SUMMARY OF THE INVENTION

The invention is applicable more generally to the operation and performance of clocks, watches and similar instruments requiring substantially no surveillance and nevertheless acting dependently and accurately for an extensive length of time.

It is therefore one of the important objects of the invention to provide means resulting in a highly economical and inexpensive vibratory drive system which can be easily adapted to the clockwork of timepieces and similar instruments preferably employable in the scientific field which require precision and exactitude for their operation.

It is another object of the present invention to provide means conducive to a compact and relatively sturdy device for transferring electric energy to a mechanical drive arrangement which includes vibratory motion release and distribution.

Yet a further object of the invention is directed to means affording convenient and continuous replacement or replenishment of energy losses to which said device or instrumentality is being subjected during operation.

These and other objects and features of the invention ensue from the following detailed specification, reference thereto being made in the attached drawings illustrating some preferred embodiments of the invention .

BRIEF DESCRIPTION OF THE DRAWING

FIG. 1 shows a basic diagram of a device according to the invention employing two electrodes, one of which can be excited to perform mechanical vibrations.

FIG. 2 is another form or embodiment pursuant to the invention with two electrodes, both of which being excitable to carry out vibrations.

FIG. 3 is a similar embodiment equipped with three electrodes, two of which being movable.

FIG. 4 is still another form of the invention having incorporated three electrodes, of which only one is movable.

FIG. 5 shows schematically the application of the embodiment of FIG. 4 to a ratchet wheel drive.

DETAILED SPECIFICATION

For achieving a structure capable of performing desired vibrations a mass must be mounted in a resilient or springy manner and in a fashion that the mass can transmit its kinetic energy to a resiliently suspended or supported member, and after complete transmission or transfer of kinetic energy of the mass, the static energy stored in the resiliently suspended member is again completely transferred to the mass in the form of kinetic energy. To maintain the resultant vibration, it becomes further necessary to replace any inevitably resulting energy losses.

In FIG. 1 there is disclosed a device with an arrangement capable of executing vibratory motions for the drive of a clock or timepiece mechanism. On an elastic or resilient member or tongue 1 is fastened an electrode 2, which constitutes at the same time primarily the vibrating mass. The other end of the tongue 1 is rigidly connected with an insulating block 3. The electrode can swing back and forth in the direction of arrow 4, when it is excited or caused to do so. For this purpose a second electrode 5 is provided at a distance and location opposite the movable electrode 2, which is likewise fastened on said block 3 by means of a relatively heavier support or carrier 6.

Tongue 1 and carrier 6 are electric conductors, so that through connections 7 and 8 electric current can be supplied to the electrodes from a voltage source or energy cell (not shown) for the charging of these electrodes. Block 3 contains or consists of insulation material.

The two opposite electrodes 2 and 5 constitute or function as a condenser, the capacity of which depends on the size of the mutually opposite faces of the electrodes and the distance between them. This condenser charges across the connections 7 and 8, so that electrode 5 has a positive and electrode 2 a negative potential. By the action of the electric field between these two electrodes the latter are pulled and attracted toward each other, the movable electrode 2 being moved counter to the force of the elastic tongue 1 toward and up to electrode 5.

As soon as the electrodes closely approach or touch each other, as is indicated in broken lines (FIG. 2), the potential difference between these two electrodes is compensated and the electric field rapidly disappears. Electrode 2 is now exposed only to the action or force of the tensioned elastic tongue member 1 and hence can swing back, passing, owing to inertia, beyond its neutral or initial position to a second end position shown in broken lines (FIG. 1).

The voltage source with which the electrodes are connected is high-ohmic, or has purposely been rendered high-ohmic by a preconnected or series ohmic resistance (not shown), in order that at the time of contact of the electrodes the short circuit current is limited and, on the other hand, the condenser constituted by the electrodes, after these latter two do no longer touch each other due to the return movement of the movable electrode, is charged again with delay. This internal resistance is so great that the condenser is charged to practically the full voltage of the energy supply source at the earliest after attainment of the central position of electrode 2.

In the selection of the active internal resistance it must be also taken into consideration that the capacity of this condenser may vary, whereby the charging time may likewise be varied.

In FIG. 2 another form of construction according to the invention is revealed in principle. It differs from the first embodiment only in the likewise resilient arrangement of the second electrode 5.sup.1, which is fastened to an elastic tongue 1.sup.1, so that the two electrodes 2 and 5.sup.1 are able to execute mutually oppositely directed swinging movements, whereby they touch once in the course of each occurrence of vibration for the purpose of charge exchange, as is indicated in broken lines. Also these electrodes are connectable to a high-ohmic voltage or like energy source (not shown).

In the embodiment of the invention according to FIG. 3, two electrodes 10 and 11, maintained at a distance by a web or bridge element 9, and electrically insulated from each other, are arranged at the freely vibrating end of a resilient tongue 12. These electrodes are connected for electric conduction via flexible conductors 13 and 14 with the terminals 15, 16 so that corresponding charges can be supplied to them from an energy cell or source (not shown).

Between these two movable electrodes 10 and 11, there is arranged a stationary or fixed third electrode 17 which is electrically insulated. Between the two outer electrodes 10 and 11 there exists a voltage difference, and when by a single external influence electrode 10, for example, has been brought into contact with the central electrode 17, the latter assumes the same polarity, and subsequently electrode 10 is repelled from and simultaneously electrode 11 is attracted by electrode 17, because the latter two carry opposite charges. These two forces acting in the same direction deflect tongue 12 in the opposite direction until electrode 11 comes in contact with electrode 17, thereby causing a charge exchange and the aforementioned operation and phenomenon repeating itself in reverse direction.

In contrast to the two first-mentioned examples pursuant to the invention as per FIG. 3 forces act on the vibrating mass in either direction of movement thereof, and during the brief contact of the electrodes 10, 17 and 11, 17 only a relative small compensating current flows, which is independent of the resistance of the circuit including electrode 10, conductor 13, terminal 15, voltage source, terminal 16, conductor 14 and electrode 11. The voltage source must simply replenish the electrons intermittently absorbed by electrode 17 from electrode 11, which it transfers to electrode 10. Therefore the efficiency of this device is extremely high and dependable.

FIG. 4 shows a variant of the embodiment of the invention of FIG. 3, in that the two outer electrodes 18 and 19 are fixedly attached or held in position and the central electrode 20 is fastened to the freely vibrating end of tongue 21 as indicated in FIG. 4 at 25, 26. Electrode 20 is electrically insulated from the remaining part of the instrumentality, as shown. The operation of this structure of FIG. 4 is basically the same as that of FIG. 3 with the exception that the central electrode 20 is able to swing back and forth between the two outer electrodes 18 and 19. (See wiring diagram of FIG. 5.)

Contact points 22, 23 and 24 of a known conductive metal or material resistant to burning down or melting are arranged on the end faces of the respective electrodes. They render it possible that when using a voltage source of 1,000 volt, for example, the electrodes need not approach each other completely for the charge exchange or load compensation, in that already at a sufficiently minute or small distance between the contact points a spark arcs over, which suffices for charge compensation. In this way the harmonic vibratory movement of the mass (electrodes) is not disturbed by any impact of the electrodes on each other.

For the partial decoupling of the vibration energy a transducer may be inserted in the circuit, which transforms the current surges occurring during a charge reversal into an alternating current voltage, which can be tapped at the terminals of the secondary winding of the transformer or transducer. At the resilient tongue a pawl may be arranged which engages in the asymmetrical teeth of a gear, the latter being advanced by one tooth during each vibratory movement. (See FIG. 5.)

Since for generating a force necessary for vibrating the electrodes a voltage source of relatively high voltage, say, of at least 100 volt, is necessitated, an isotropic generator is advantageously employed. Such voltage cells or sources can be accommodated within a minimum of space and yet furnish a terminal voltage of more than 1,000 volt.

The electric circuit of these above described aggregates or instrumentalities is very simple and any necessary changes of direction of the electric field are effectuated automatically by the movements of the electrodes. The great advantage of this arrangement is that a vibration generator can be conveniently accommodated at greatly reduced dimensions, yet operates with a very high efficiency and is suitable for installation in timing instruments, clockworks and the like.

It will be seen from the aforesaid disclosure that there has been created according to this invention a very compact and highly efficient vibratory system, which lends itself to a great variety of applications in the instrument field and may be modified or altered according to the purpose intended.

Claims

What is claimed is:

1. A system for generating periodical mechanical oscillations with relatively high-frequency stability, in particular for use in connection with timepieces and like instruments, characterized by two electrodes springedly and swingably supported and mutually electrically insulated, a common bridge element for said two electrodes forming the support therefor and maintaining the two electrodes at predetermined fixed distance from each other, a third electrode having opposed surfaces located between said bridge element and said two swingable electrodes, the course of oscillation of said two electrodes with said bridge element being limited by said opposed surfaces of said third electrode, and means connecting both said swingable electrodes with respective poles of a power source.