US1364428A

US1364428A - Needle-changing device for talking-machines

Info

Publication number: US1364428A
Application number: US363887A
Authority: US
Inventors: Carlo Donato Di
Original assignee: Individual
Current assignee: Individual
Priority date: 1920-03-06
Filing date: 1920-03-06
Publication date: 1921-01-04
Anticipated expiration: 1938-01-04

Description

0. 0| CARLO. NEEDLE CHANGING DEVICE FOR TALKING MACHINES.

APPLICA ION FlLED'MAR.6-i92 1 64,428. Patented J an. 4, 1921.

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lltZ/filllflf DanaZnDi Car/Zn UNITED STATES DONATO DI CARLO, OF PHILADELPHIA, PENNSYLVANIA.

NEEDLE-CHANGING DEVICE FOR TALKING-MACHINES.

Application filed March 6,

T 0 all whom it may concern Be it known that I, DONATO DI CARLO, a subject of the King of Italy, (having declared his intention of becoming a citizen of the United States,) residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Needle-Changing Devices for Talking-Machines, of which the following is a specification.

One object of my invention is to provide an improved structure for automatically moving the needle holder of a sound box into a position from adjacent the record to a position remote from therecord so that the needle can be conveniently changed without injuring the record.

Another object is to make my invention of a simple and durable construction and so that it can be easily assembled or taken apart.

These objects, and other advantageous ends which will be described hereinafter, I attain in the following manner, reference being had to the accompanying drawings in which- Figure 1 is a fragmentary top plan view illustrating my invention,

Fig. 2 is a side elevation of Fig. 1,

Fig. is a section taken on the line of Fig. 1 showing the sound box and the locking parts in outside view,

Fig. -1 is a view of similar character to Fig. 2 showing the same after having been automatically operated to move the needle holder into a position to permit the needle to be conveniently changed without possible injury to the record,

Fig. 5 is a transverse section taken on the line 55 of Fig. 3.

Fig. 6 is a detached view shown partly in section of the parts of my invention and illustrating how the same can be taken apart or put together, and I Fig. 7 is a perspective view of a spring retaining member which forms a part of my invention.

Referring to the drawings, 8 represents a tone arm which has a hollow cylindrical cross or T-head 9 open at its opposite ends as shown in Fig. 6. A sound box 10 has a collar llwhich fits in an open end 12 of a cylindrical sleeve 13. The opposite end of the sleeve 13 is closed as shown at 14 and a Specification of Letters Patent.

Patented Jan. 4, 1921.

1920. Serial No. 363,887.

trunnion 15 projects outwardly from the closed end 14. The sleeve 13 is adapted to freely rotate and fit within the head 9 and has an aperture 16 adapted to register with the tone arm 8 when the needle 17 in the holder 18 of the sound box is in its operative position in engagement with the record 19 as clearly shown in Fig. 2.

A. spiral spring 20 has its inner coiled end provided with a hole through which a pin 21 in the trunnion 15 extends; said spring being coiled around said trunnion. The op posite end of the spring 20 extends through a notch 22 in the head 9. The notch 22 extends inwardly from the end 23 of the head 9 and a retaining member 24, which is provided with a curved portion 25 screwed to the head 9, has an arm 26 which extends over the notch 22 and abuts the outer end of the spring throughout its width. This arm 26 has an extension or hook 27 for engaging the edge of the spring, as clearly shown in Fig. 1, and a disk 28 having a hole 29 fits within the end 23 of the head 9; said trunnion having a portion 30 of reduced diameter, which extends through the hole 29 of the disk 28 and the shoulder 31 which is provided by the formation of said part 30 of the trunnion, abuts the inner surface of the disk 28 and limits its inward movement.

A cap screw 32 has its threaded portion fitting a tapped opening 33 in the trunnion 15 and thereby secures the disk to the trunnion and also serves to hold the disk in a position closing the end 23 of the head 9. It will thus be noted that when the parts are assembled that one end of the spiral spring 30 is connected to the head 9 and the other end engages the pin 21 of the trunnion 15. The spring 20 is so wound that when the sound box is partially rotated clockwise. for example from the position shown in Fi 4; to the position shown in Fig. 2, that The spring 20 will be wound and placed under tension so that when released the sound box will be partially rotated automatically in a contra clockwise direction viewed from Figs. 2 and 4.

A lever 34 is pivotally mounted on a bolt 35 which is secured upon the top of a post 36 of a bracket 37; said bracket being secured to the top of the head 9, as clearly shown in Figs. 1, 3 and 6. The lever 34 at one side of the pivot post 35 has a knob 38 and, at the opposite side of said pivot bolt,

is extended to provide alatch 39. A coiled spring 40 is interposed between the lever and the base of the bracket 37 and serves to swing the lever 34 so that the latch 39 will be moved downwardly.

A plate 41 is secured to the peripheral edge of the sound box and has a handle 42 projecting therefrom and a lug 43 spaced from said handle 42 as clearly shown in Fig. 4. The latch 39 extends across the outer surface of the plate 41 and when the sound box 10 is partially rotated from the position shown in Fig. 4 to the position shown in Fig. 2, the latch 39 will engage behind the lug 43 and will be abutted by the shoulder 44 thereof so as to hold the sound box 10 against rotation by the spiral spring 20. After the sound box has been moved into a position such as shown in Fig. 2 with its needle 17 in playing position relatively to the record 19, if it is desired to change the needle 17 it is merely necessary to push downwardly on the knob 38 of the lever 34 so as to move the latch 39 above the level of the lug 43 and to free the shoulder 44 thereof from the latch 39. The spring 20 will then serve to partially rotate the sound box until the handle 42 strikes the latch 39 and limits the further automatic rotation of the sound box and the extent of this movement is such as to position the needle holder 18 and needle 17 sufficiently above the record 19 to prevent injury to the record while changing the needle and permit the needle to be conveniently taken therefrom and another needle inserted. During the automatic movement of the sound box a person can hold the handle 42 so as to prevent the latter from forcibly striking the latch or in other words a person can easily check the automatic movement of the sound box by slightly exerting a retarding pressure against the handle until the latter has come into its stopping position against the latch 39.

To remove the spiral spring 20 it is merely necessary to take out the cap screw 32 and remove the two screws which secure the retaining member 24 after which the entire spring 20 can be pulled out of one end of the head 9 and the sound box and sleeve 13 can be pulled out of the other end thereof.

While I have described my invention as taking a particular form, it will be under stood that the various parts of my invention may be changed without departing from the spirit thereof, and hence I do not limit myself to the precise construction set forth, but consider that I am at liberty to make such changes and alterations as fairly come within the scope of the appended claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is l. A talking machine including a tone arm having a cylindrical head open at opposite ends; a sound box having a sleeve thereon projecting into the head through one of said ends, said sleeve having a trunnion thereon located adjacent the opposite end of the head; a spiral spring fitting within said head and surrounding the trunnion, said spring being operatively connected to the head and to the trunnion; and means for closing said latter mentioned end of the head and being secured to saidtrunnion whereby the spring is confined between said latter means and the inner end of the sleeve and can be conveniently removed; substantially as described.

2. A talking machine including a tone arm having atransversely extending head open at its opposite ends; a sound box; a sleeve on said sound box rotatably fitting within said head so that said sound box is located at one side thereof; a trunnion extending outwardly toward the opposite end of said head from the inner end of said sleeve and being located within said head, said head having a notch extending inwardly from said latter mentioned end; a coiled spring fitting within said head and having one end positioned within said notch and the other end connected to said trunnion; and means for securing said first end of the spring within the notch whereby when said means is removed, said latter end of the spring can he slid out of said notch; substantially as described.

3. A talking machine including a tone arm having a head open at its opposite ends; a sound box having a needle holder; a sleeve on said sound box rotatably fitting within said head so that said sound box is located at one end thereof; a trunnion extending outwardly toward the opposite end of said head from the inner end of said sleeve and being located within said head, said head having a notch extending inwardly from said latter end; a coiled spring fitting within said head and having one end positioned within said notch and the other end connected to said trunnion; means for securing said first end of the spring within said notch and means for closing said latter mentioned end of the head; substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

D'ONATO DI canto.

Witnesses:

RALPH D1 LUCIA, CHAS. E. Forms.