US1602182A - Reproducer attachment - Google Patents

Description

A. T. TAYLOR REPRODUCER ATTACHMENT I Filed Dad. 14 v 25 mistres es; s, was j ALFRED '1. TAYLOP OF RICHMOND HILL, NEW YORK.

REPRODUCEB ATTACHMENT.

Application filed December 14, 1925. Serial No. 75.297.

This invention rclatesto reproducer attachments and more particularly to electromagnetically operated reproducers.

lhe object of this invention is to provide a compact unit of simple construction, which may be easily attached to an electromagnetic unit to form an electrical reproducer for disc phonograph records.

This object is attained by forming a cap member which carries a ferrule which is adapted to be attached to the tone arm of a phonograph. A stylus bar yieldingly supported within the cap member is provided with a movable member to adjust the airgap between the armature and the pole pieces of the electromagnetic unit. A chamher on one side of the armature contains damping material. This construction affords an inexpensive and efiicient attachment which is simple in structure and can easily be manufactured.

Referring to the drawings Fig. 1 illustrates in cross-section the structural features of this invention and Fig. Qis an enlarged view in elevation of the combination stylus bar and armature.

The reproducer attachment of this invention comprises a circular cap memberl, preferably of insulating material, such as hard rubber. This member may be moulded, and as shown, is provided with a concentric socket 2 on one surface thereof, which carries a bushing 3, preferably of soft rubher, to provide a yielding connection to the metallic tone arm 4 of a phonograph. An internal thread 5, on the cap member receives the electro-magnetic unit 6, shown in dotted lines.

The cap member 1 is provided with an aperture 7, through which the stylus bar 8 projects. The portion of stylus bar 8 which extends into the cap member is preferably of semi-circular cross-section and tapered at one end, to provide strengthening means for the reed or armature 9. The armature 9 may be formed integral with the stylus bar, or if made of different material, the stylus bar may be welded or otherwise secured to the armature. A metallic disc 10, of magnetic material, such as iron or steel, is fastened to one surface of the armature coaxial with respect to the inner wall of the .cap member. This disc provides a large surface area for the armature 9 thereby reduc ing the size of the armature, which in accordance with this invention is a thin reed of metal.

The combination stylus bar and armature is supported within the cap? member 1, by means of a metallic bearing member comprising a pair of metal supporting blocks 11 which are rigidly attached to the cap mem her by screws 12, and ayielding bridge 13, of angular cross-section. which is preferably welded to supporting blocks ii. The stylus bar and armature is soldered or welded to the bridge 18 intermediate the ends thereof. This arrangement affords an ctlicient yieldable support for the stylus bar and prevents side play in the armature. A metallic bushing 14 is moulded in the cap member at a right angle to the free end of armature 9. An adjusting screw 15 isthreaded in the bushing 1t and attached to the armature by means of a stud 16 which passes through the armature and is threaded in the adjusting screw 15. This adjustment provides an easy means of varying the gap between the pole pieces of the electro-magnetic unit 6 and the disc 10.

A concentric depression on the inner sur face of the cap member forms a chamber for the damping means 17, which may consist of sponge rubber or other damping material, The damping means fills the chamber and is in contact with one surface of the armature 9 to absorb shock and the natural fre quencies of the reed or armature 9. The end of the stylus bar 8, projecting from the cap member, is pro vided with a socket to receive a phonograph needle 18 which is held in the socket by means of a screw 19 The reproducer attachment may be readily connected to any commercial headphone unit and the receiver cord connected to a vacuum tube amplifier to reproduce electrically the recordings on the record.

Although the invention has been disclosed with respect to a particular arrangement of parts, it is understood that various modifications may be made in the structural senibly, without departing from the scope of lid netic unit, a yielding member carried by said cap member, a stylus bar attached to said yielding member, and means for damping said stylus bar.

2. A reproducer attachment comprising a cap member having a socket adapted to be attached to the tone arm of a phonograph, said member having a threaded portion adapted to be connected to an electromagnetic unit, a yielding member carried by s 'id cap member, a stylus bar attached to yielding member, an armature carried said her, means on said cap member to control the movement of said armature, and additional means to dampen said armature. eproducerattachment according to n'z, said armature having a metallic Wtached thereto intermediate the ends reproducer attachment comprising an insulating cap member having a concentric socket adapted to be attached to the tone arm of phonograph, said member having internally threaded portion adapted to be connected to an electromagnetic unit, a

yieldable metal bearing surface carried with in said member, a stylus bar rigidly attached to said bearing, said bar being substantially Within said cap member, and adjustable means extending through said member and attached to said stylus bar.

5. A rcproducer attachment comprising an apertured insulating cap member having a socket adapted to be attached to the tone arm of a phonograph, said member having a threaded portion to be connected to an electromagneticunit,. a yielding bearing member carried. Within said cap member, a stylus bar'attached to said bearing member, a portion of said bar extending through said apertured cap member and another portion being Within said cap member, an adjusting screw attached to the free end of said bar, and damping material held in said cap member by said bar.

In witness whereof, I hereunto subscribe my name this 11th day of December A. D. 1925.

ALFRED T. TAYLOR.

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