US1512851A - Stylus bar for talking machines - Google Patents

Description

@Cin 2 n F. A. E. JENKINS STYLUS BAR FOR TALKING MACHINES Filed March 27 1924 Patented Oct. 21, 1924.

UNITED STATES PATENT, OFFICE...

FREDRICK ALFRED EDWARD JENKINS, or SYDNEY, NEW SOUTH WALES, AUSTRALIA.

STYLUS. BAR roe TALKING MACHINES.

Application filled March 27, 19 24. Serial No; 702,467;

To all whom it may concern:

Be it known that FREDRIOK ALFRED En.-

wAR-n JENKINs, a subject of; the King off Great Britain and Ireland, residing at.6 Haig Avenue, Summer. Hill, Sydney, in the State of New South Wales, Commonwealth of Australia, engineer, has invented. certain new and" useful Improvements in .Stylus' Bars for Talking Machines, of which the following isa specification.

This invention" relates to the method: of mounting-stylus bars;on the sound boxes of. talking machines and has for its object an improved means of attaching-the stylus bar to the sound box whereby the stylusbar, is

permitted to oscillate freelywand convey the.

vibrations imparted to it by the" record to the diaphragm with as little resistance as possible.

The invention consists in mounting the stylus bar on three pin points one of which opposes the other two, the three points being in alignment with each other and in the same plane and the line through the three points parallel to the plane of the diaphragm. The invention furtherconsists in making pin points adjustable so that any irregularities or imperfections in the stylus may be counteracted.

The invention will be fully explained with reference to the accompanying drawings in which Figure 1 is a perspective view of a sound box of the horizontal type showing the method of attaching the stylus bar according to this invention.

Figure 2 is a similar viewl sound box of the vertical type.

Figure 3 is a perspective view of a sound box showing an alternative method of carrying out the invention. I

Figure 4 is an enlarged elevation of the alternative method shown in Figure 3, and

of part of a Figure 5 is a perspective view ofa sound A third point 17 attached to the stylus bar 16 bears against the projecting arm and opposes the pin points 13 and 14. The points 13;,14and 1 7 are in the same plane and: in alignmentv with each other and the line through the-.pointsis parallel to the plane. of the diaphragm, so that thearms' 151 of the stylus-bar are permitted to oscillate freelyand convey the vibrations imparted to the stylus'or needle by the record, with a mini; mum. resistance to the diaphragm. of the sound. box;:.

In the vertical type of sound: box (see ure 2i. the point 17 is attached. to the sound box' (i and the screws: 11. and" 12 project through. small brackets 18 formedv on the sound: box; The stylus bar 16 bearsagainst the three points 13,. 14 and: 17 whichaare. in.

the. same plane a and in. alignment. with. each other.. The. point. 17 as. beforeopposes' the points 13 and 14 and the line through the points is parallel to the plane of the diaphragm.

In the alternative method shown in Figure 3 the point 17 is slidably contained within a sleeve 19 attached to the sound box and is pressed against the stylus bar by a spring 20 the pressure of which may be varied by the screw 21, the bearing points 13, 14 and 17 being as hereinbefore set out in the same plane and in alignment with each other. As shown in Figure .4 the line A A ofthe pin points 13, 14 and 17 is parallel to the plane of the diaphragm.

In the modification shown in Figure 5 the point 17 and arm-1O are replaced by a knife edge 22 which bears at right angles on another knife edge 23 formed in the stylus bar 16. The edge 22 is integral with the plate 24 which is adjustably secured to the sound box 6 by means of the springs 25 which bear '1. In a talking machine in combination,

a sound box having, a diaphra In, a stylus bar, spaced arms carried by an projecting laterally from the sound box and arranged on opposite sides of the stylus bar, hori-.

zontal arms extending in opposite directions fromthe stylus bar and arranged in proximity to the arms of the sound box, pins mounted through the ends of one set of said arms and having pointed ends bearing transversely and convey the Vibrations i1n-' parted to the stylus with minimum resistaneeito the vdraphragm, the pins being adjustable sons to counteract irregularities in projecting laterally therefrom,

the stylus bar, and the points of engagement of said pins and bearing member being arranged 1n the same plane and in alignment W1th each other so that a line drawn phra'gm of the soundbox;

In a talklngmaehine lnoombination, a sound box having a diaphragm, a stylus bar,

spaced arms carried by the sound box and arms being arranged on opposite sides of the stylus barandin the same plane, the.

other '7 arm being positioned between the through the points is parallel to the plane of the dia- V plane of the diaphragm o'f the sound box.

' the outer outer arms in a diiferent but parallel plane,

opposed arms on the stylus bar arranged adacent the outer arms on the sound box, plns adyustably arranged between the outer arms allel with the axesrfi the pins and coaeting with the stylus bar and the medial arm and acting in opposition to the pins whereby the armsor the stylus bar are permitted to osoillate freely and eonvey'the vibrations impa-rterltothe stylus, with aminimum resistance, to the diaphragm, and the points of engagement: of the pins and bearing member being arranged in the same plane and in aligninent'with eachiother so that a line drawn through the points is parallelto the *In testimony whereof he has aflixed his signature in presence of two Witnesses.

* FREBRX CK'ALFRED EDWARD JENKINS. Witnesses: m I r T. C. ALLEN, WfALLEN}

Images