US1214181A - Brake for phonographs. - Google Patents

Description

F. KRAFI.

BRAKE FOR PHONOGRAPHS.

APPLICATION FILED AUG.16. 1916.

Patented Jan. 30, 1917..

\IIIIIIIIW l l l II are: s

Beans ron rnonoennrns.

specification of matters Eatent.

Patented Jan. 33, 121?.

Application filed August 16, 1916. Serial No. 115,125.

automatically set at the end of the inward sweep of'the tone arm. This sweep varies in length for different lengths of records,

and means have therefore been devised, for causing the brake .-to be correctly set irrespective of the length of the tone arm sweep. In other words, the brake will be automatically applied on records of greater as well as of less length or whenever the piece of music is finished.

In the accompanying drawing: Figure 1 is a horizontal section of a brake embodying my invention, taken in a plane above the turn table of a phonograph; Fig. 2, a vertical section partly in side View; Fig. 3, a horizontal section through the tone arm showing adjoining parts, and Fig. 4, a wiring diagram.

The cabinet of the phonograph is furnished with the usual to 1, through which passes the spindle 2, o the turn table 3, which spindle is driven in suitable'manner. To top 1 there is secured, a plate 4 to which is pivoted at 5, a brake lever 6 having a handle 7. Lever 6 is provided with a brake shoe 8, of suitable construction which is adapted to be projected against the edge of the turn table 3, by means of a spring 9, which is shown to be secured at one end toplate 4 and at the other end to handle 7. To lever 6 there is pivoted one end of a rod or brake controlling member 10 passing diametrically beneath turn table 3, and having an elongated eye 11 for the accommodation of spindle 2. The other end of rod 10, is provided-with a spring arm 12, to which is secured a beveled head 13 constituting a spreading bolt. This head is adapted to engage an abutment comprising a notched sleeve 14: rotatably mounted upon pin 15,

that extends upwardly from top 1, the sleeve being influenced by a spring 16. Sleeve 14 is-provided with a tail piece 17 which is adapted to be engaged by a split collar or tripping member 18 shiftably encircling the tone arm 19. This collar is formed of two sections hingedly connected at one of their Through ends 21, passes a pin 22, which by means of springs 23, has a tendency to contract the collar upon the tone arm.

The operation is as follows: When the machine is playing, head 13 engages notch 24 of sleeve 14, which will cause rod 10 to be so advanced, against action of spring 9, that brake 8 is held ofl' turn table 3 (Fig. 2). When the tone arm has reached the end of its path, tripper 21 will strike tail 17, so as to turn sleeve 14 (against action of spring 16) and dislodge head 13 from notch 24, the sleeve being by its spring 16 immediately returned to its normal position, after this dislodgment has been eflected. The release of the head 13 from the sleeve 14;, will efiect the release of rod 10, so that spring 9 will now retract the same and swing lever 6 inward to carry brake shoe 8 against turn table 3. As soon as the head 13 has relinquished sleeve 14, it will pass between the ends 21 of collar 18 (Fig. 3) and thus spread the latter against action of springs 23, the collar being thus loosened upon the tone arm 19 but being arrested in position by the interposition of the head 13. A new record is now fitted upon the turn table and the tone arm is swung inward so that the stylo is brought opposite the end of such new record, the movement of the tone arm being not participated in by the collar. The brake is released by hand lever 7, thus pulling head '13 out of collar 18, and causing the lat ter to be again tightened upon the tone arm by springs 23, while the head will become reengaged by sleeve 14:. The motor is started and the tone arm is swung to the beginning of the record carrying the collar 18 with it, whereupon the iece is played and the operation described is repeated. 7

lit will be seen that the collar 18 will trip the brake controlling means, as soon as the tone arm has reached the end of its path and that the collar will be set automatically in such a manner that it will be carried in due time against the brake controlling means, irrespective of the length of the tone arm stroke. in this way, the brake will be promptly applied at the end of longeras well as of shorter records. in case the turn table is operated by an electric motor, the brake may be so connected to the motor that there is provided, a contact 25, which is sep- 7 arated from plate 4 by insulation 26, and is connected to the motor-by wire 27 (Fig. 4),

while a second wire 28 leads from lever 24.

through the source of power to the motor. When the brake is off, the circuit will thus be closed, and the motor started.

I claim: i

1. A phonograph comprising a turn table, a brake, a tone arm, a tripper mounted on the tone arm and adapted to be normally in operative engagement therewith, and brake controlling means ada ted to arrest the tripper' and simultaneous y break its operative engagement with the tone arm.

2. A phonograph comprising a turn table, a brake, a tone arm, a split collar mounted and a spreader operatively connected to the brake, said spreader being adapted to arrest the collar, and to simultaneously break its frictional engagement with the tone arm.

3. A phonograph comprisin a. turn table, a brake, a tone arm, a tripper tted upon the tone arm, and means operable by the brake for loosening said tripper to permit an independent movement of the tone arm.

4; A phonograph comprising a turn table, a brake, a tone arm,-a tripping member movably mounted thereon, and means operable by the brake for simultaneously loosening and arresting the tripping member.

5. A phonograph comprising a turn table, a. brake, a brake setting rod, a tone arm a split collar movable on the tone arm, an a 1 head carried by the brake setting rod and adapted to simultaneously spread and arrest the collar; I

'6. A phonograph comprising a turn table,

a spring-influenced brake, a rod connected thereto, a head carried by the rod, a movable abutment adapted to be engaged by head, a tone arm, a collar movably fitted 'upon the tone arm and adapted to be engaged by the head,'said collar being adapted to actuate said abutment. on the tone arm and adapted to be taken along thereby through frict1onal contact,

tone arm and adapted to be engaged by the head, said collar being adapted to engage the tail piece.

FREDERICK KRAFT.

the

Images