A GENERATOR OF HARMONIC SIGNALS WITH A HELICAL SPRING

• US 3,634,595 A
• Filed: 03/23/1970
• Issued: 01/11/1972
• Est. Priority Date: 03/31/1969
• Status: Expired due to Term

• Current Assignee: Giorgio Pasquali
• Original Assignee: Giorgio Pasquali
• Inventors: Pasquali, Giorgio
• Primary Examiner(s): Duggan, D. F.
• Assistant Examiner(s): Weldon, Ulysses
• Application Number:
  US05/021,822
• Time in Patent Office: 659 Days
• Field of Search: 84/1.16,1.15,1.04,1.6D,1.6E,1.6MR,173,174,199,DIG.21,1.14 310/15,25 333/30
• US Class Current: 84/743
• CPC Class Codes: G10H 3/12 using mechanical resonant generators, e.g. strings or percussive instruments, the tones of which are picked up by electromechanical transducers, the electrical signals being further manipulated or amplified and subsequently converted to sound by a loudspeaker or equivalent instrument

Abstract

A generator of harmonic signals consisting of a spiral spring that is caused to vibrate in a longitudinal direction and means to cause said longitudinally directed vibrations thereof. Means to detect said vibrations are provided, in the form of a coilshaped pickup which operates on the basis of magnetic changes, as provided therein by a magnetic field permanently associated with said spring.

Claims

1. A harmonic signal generator comprising a helical spring;

support means connected to each end of said spring;

semirigid mount means for mounting at least one of said support means to impart a degree of freedom of movement thereto and to said spring in the longitudinal direction thereof;

but preventing movement in the radial direction thereof;

means for imparting longitudinal vibrations to said spring;

said spring being magnetized to have a magnetic pole spaced from said support means; and

electromagnetic pickup means including a stationary coil coaxially surrounding said spring in spaced relation thereto, such that the plane of said coil is perpendicular to the longintudinal axis of said spring, and said magnetic pole is in said plane when said spring is not vibrated, whereby longitudinal movement of said pole out of said plane due to said vibrations generates an electromotive force in said coil.

2. A device as claimed in claim 1, wherein said means for imparting longitudinal vibrations includes means for causing a percussion to said semirigid mount means.

3. A device as claimed in claim 1, wherein said means for imparting longitudinal vibrations includes means acting directly on said spring.

4. A device as claimed in claim 1, wherein said semirigid mount means comprises a bracket surrounding at least one of said support means with yieldable material positioned therebetween, said yieldable material providing means to dampen said radial movement.

5. A device as claimed in claim 1, wherein at least one of said support means includes means to change the number of operative coils of said helical spring.

6. A device as claimed in claim 1, further comprising means operatively associated with at least one of said support means to impart axial torsion to said helical spring to cause slight changes in the coil diameter thereof.