US955894A

US955894A - Sound-box for talking-machines.

Info

Publication number: US955894A
Application number: US38902807A
Authority: US
Inventors: Edwin H Mobley
Original assignee: Individual
Current assignee: Individual
Priority date: 1907-08-17
Filing date: 1907-08-17
Publication date: 1910-04-26
Anticipated expiration: 1927-04-26

Description

E. H. MOBLEY.

SOUND BOX FOR TALKING MACHINES.

APPLICATION FILED AUG. 17, 1907.

955,894. Patented Apr. 26, 1910.

EDWIN H. MORLEY, F HILLSIDE, PENNSYLVA NIA.

SO UND-BOX FOB. TALKIN G-MACHIN ES.

Specification of Letters Patent.

Patented Apr. 26, 1910.

A lication filed August 17, 1907. Serial No. 389,028.

To all whom it mi 1! concern} Be it lmown tnat. I, EDWIN H. Mommy,

a citizen of theUnited States, residing in Hillside, Montgomery county, Pennsylvania, have invented certain Improvements in Sound-Boxes for Talking-Machines, of which the following is a specification;

My invention relates to sound boxes for use in connection with records having grooves of the--hill-and-valley type, the objects of my invention being to provide for the secure connection of the stylus lever to' the diaphragm, and for the proper contact of the stylus with the undulating bottom of the groove without impairing the desired freedom of movement of saidstylus and without affecting the purity of the reproduction. These objects I attain in the' manner hereinafter set forth, reference being had to the accompanying drawing, in which-- Figure l is a view partly in side elevation and partly in vertical longitudinal section of a sound box constructed in accordance with my invention; Fig. 2 is a perspective View showing certain elements -of said sound box detached therefrom; Fig. 3- is an enlarged perspective View of the blank from which the diaphragm connection is made; Fig. 4 is a. perspective view of the same after it has been bent for application to the diaphragm and connecting link, and

Fig. 5 is a sectional view illustrating a modification of one of the features of my in vention.

1 represents the cup-like casing of the sound box to which the diaphragm 2 may be secured in any desired Way, the means adopted in the present instance for effecting this object being a threaded. ring 3 which engages a thread formed on the inner wall of the sound box and serves to confine the outer portion of the diaphragm against a suitable shoulder in said box.

The stylus 4 which engages the groove of the record is carried, as usual, by one arm of a stylus'lever 5, pivotally mounted upon a bracket 6 which is secured to a weighted arm 7, the other arm of said lever being connected to the diaphragm 2 by means of a link 8 which passes through a central opening in the arm 7.

The arm 7 is hung by means of a pivot pin 9 to a block lO, which is pivotally mounted upon a pin 11, the latter passing through an opening in the sound box casing,

and having a threaded upper end for the re ception of a nut 11 which bears upon said casing. The pin 11 is disposed at a right angle to the pivot pin 9, whereby swinging movement of the arm 7 in all directions is permitted within the limits imposed by contact of a projecting pin 12 at the outer end of the'arm with a yoke 13 projecting from the face of the sound box, as shown in Fig. 1,- freedom of lateral movement being insured owing to the fact that the block can swing upon the pin 11, and the latter can turn in the opening to which it is adapted.

It is advisable in many cases to employ in connection with the arm 7 a spring for pressing upon said arm and imparting an outward thrust thereto. Such a sprin is illustrated at 14 in the drawing, one en of the spring being secured, by soldering or otherwise, to the pivoted block 10, and its other end bearing upon the inner face of the arm 7, the spring'having a central opening or slot for the passage of the link 8. By this means the spring partakes freely of the lateral movements of the arm 7 and there fore opposes no resistance to such movements or to the movements of the stylus 4 and stylus lever 5, consequently the freedom ofv movement of the stylus is not restricted in any way by the action of the spring, nor is the purity of the reproduction impaired by any scraping contact of the spring with the. lever, as it would beif said spring was mounted upon a fixed member of the sound box casing instead of upon the pivoted and swinging block 10. In so far as the attainment of the desired result is concorned, it is, in a measure, immaterial which end of they spring is the one to be secured, although the construction shown is preferred.

If adjustment of the tension of the spring let is desirable, this may be effected either by means of an adjustable screw 15 carried by the block 10, and bearing upon the spring in advance of its point of connection to the block, as shown .in Fig. 1, or by means of a screw 16 carried by the arm 7 and constituting the bearing point for the free end of the spring, as shown in Fig. 5.

The link 8 is usually cemented to the diaphragm 2 but this is an unstable and otherwise objectionable means of attachment, in place of which I use a clip consisting of a strip 20 of sheet metal as shown in Fig. 3,

this stri being first bent, as shown in Fig. 4, so as to orm a loop 21 with shoulders 22 at the base and projecting wings 23, which after being passed through a central openingin the diaphragm are bent down upon the back of the same, a washer 24 being, by preference, interposed between the diaphragm and the bent wings, and another washer 25 being indiaphragm, provides a stable connectionv which is not impaired by long continued use of the sound box or by changes of tem perature or rough handling to which the sound box may be subjected.

I claim I l. The combination, in a sound; box for talking machines, of the sound box casin and its diaphragm, a stylus lever connecte to the diaphragm, an arm to which said stylus lever is ivoted, a member to which said arm is pivoted, said member having pivotal connection with the casing the axis of WI 'ch connection is at right angles to the pivo of the arm, and a spring cooperating with the arm and with said pivot member, said spring bein secured atone end to one of sai to the pivoted arm.

talking machines, of the sound box casin 40 2. The combination, in a sound box for and its'diaphragm, a stylus lever connected 1 to the diaphragm, anf arm to which said stylus lever is pivoted, a member to which said arm is pivoted, said member having pivotal connection with the casing the axis of which connection is at right angles to the pivot of the arm, and a spring connected to said pivot member and bearing upon the back of the arm so, as thrust to the latter. I 3. The combination, in a sound box for talking machines, of the sound box casin and its diaphragm, a stylus lever connected to the diaphragm, an armto which said 'stylus lever is pivoted, a block to which said armis pivoted, a pin upon which said block is pivotally mounted, said pin being disposed at right angles to the pivot pin of the arm and being" pivotally mounted in the casing, and a spring cooperating with the aim and with the pivot block, said spring being secured to one ofsaid parts and serving to impart outward thrust to the arm.

4, The combination, in a sound box for talking machines, of the sound box casin andits diaphragm, a stylus lever connected parts. an, imparting outward thrust to impart outward and its diaphragm,

"block mounted upon said casing, an arm to the diaphragm, an arm to which said stylus lever is pivoted, a block to which said arm is pivoted, a pin upon wluch said block is pivotally mounted, said pin being disposed at right angles to the pivot in of the arm and being pivotally mounte in the casing, and a spring secured to said pivot block and bearing upon the back of the arm so as to impart outward thrust thereto.

5. The combination, in a sound box for talking machines, of the casing and its diaphragm, a pin pivotally mounted in said casing and having a block pivotall mounted thereon, an arm pivoted to said lock, and a stylus lever pivotally mounted on said arm and acting upon the diaphragm.

6. The combination, in a sound box for block on said casing, an arm pivoted to said block and carrying a stylus lever which-acts upon the diaphragm, a spring cooperating with said arm and block and-secured to one of said parts, and means icarrid by the swing' g block for .garyiiig the tension of said spriiig. I

8. 'lhe combination, in a sound box for talking machines, of the sound box casing and its diaphrag n' a pivoted and swing- "ing block mounted upon said casin an arm pivotally mounted upon said bloc and carrying a stylus lever which acts upon the diaphragm, a spring secured at one end to said block and bearing at the other end upon the arm, and means for varying the tension of 'said spring.

9. The combination, in a sound box for talking machines, of the sound box casing a pivoted and swinging pivotally mounted upon said block and carrying a stylus lever which acts upon the diaphragm, a spring secured at one end to said block and hearing at the other endupon the arm, and means carried by the swinging block for varying the tension of said spring.

10. The combination, in a sound box for talking machines, of the sound box casing and its perforated diaphragm, a clip passing through said dia hragm and having, on the outer face thereo a member with shoulders providing a bearing therefor, and projecting w ngs bent down on the inner face of the diaphragm, a washer interposed between the diaphragm and said wings, another washer interposed between the diaphragm and its the back of the same, a washer interposed between the diaphragm and the shouldered portion of the loop, a washer interposed between the diaphragm and thebent wings of the clip, a stylus lever and a connection be- 15 tween said stylus lever and the loop portion of the clip.

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

EDWIN H. MOBLEY.

Witnesses:

HAMILTON D. TURNER, KATE A. BEADLE.