US1394509A

US1394509A - Tone-arm

Info

Publication number: US1394509A
Application number: US272681A
Authority: US
Inventors: Louis D Nadel
Original assignee: HARRIMAN NAT BANK
Current assignee: HARRIMAN NAT BANK; HARRIMAN NATIONAL BANK
Priority date: 1919-01-23
Filing date: 1919-01-23
Publication date: 1921-10-18
Anticipated expiration: 1938-10-18

Description

L. D. NADEL.

TONE ARM. APPLICATION FILED mmza, 1919.

6 5 m w n r 1 n 1 7 1 t... l M. M m m P -ir stares M FEQO LOUIS D. NADEL, OF JSFEW'ARIK NEW JERSEY, ASSIG'NOR, BY IMLE SNE ASSIGNMENTS, TO HARRIMAN NATIONAL BANK OF THE CITY OF NEW YORK, TRUSTEE.

TONE-ARM.

Specification of Letters Patent.

Patented Oct. 18, 1921.

Application filed January 23,1919. Serial No. 272,681.

r T 0 (ZZZ-whom it mag concern:

Be it known that 1, Louis D. ENADEL, a cltizen ofzthe United Statesyand a resident :of Newark, inthe county of Essex and State of-New Jersey, haveinventeda certain new and useful Tone-'Arm, -of"which the following is aspecification.

be move'd'toward and-away from therecord disk carried by the turn-table and which may be locked against movement when in'the latv teri'position.

The objects ofmy invention are to prov1de a tone-arm of the character described which will be-siinple in construction, effective in operation, not likely to get out of order, and in which the sound-boxwill be positively locked in the inoperative position and cannot be accidently released, and which'is inexpensive to manufacture.

- With these and other objects in'view to be more fully set forth hereinafter, the invention consists in the novel construction,

combination of elements, and arrangement of parts'which will be exemplified in the operation "and construction hereinafter described in the specification and illustrated in the accompanyingdrawings considered together or separately.

7 In tone-arms 'of the character-described, with which I am familiar, the relatively movableme'mber offthe t'one ar'm is secured in 1ts noperative :posltlon, away fromthe turn-table byfrictiondevices and the movable member is moved to operative position by' pressure'applied to the sound-box.

With the type of tone-arm just above described, there is always danger that when the record and to the'stylus.

With my improvedtone-a'rm, two'move- 'ments are necessary to release the lock "and the membenmu'stbe'firmly grasped by the in order toeffectthe-unlocking. When I the member.

memberl and the spherical portion of the the unlocking is accomplished the stylus can be gently lowered-into contact with the record without danger of injury to the record, sound-box or-stylus.

The invention will be, first described in connection with the accompanying drawings, illustrating one :embodimentof the invention, wherein similar reference characters are used to designate corresponding parts throughout theseveral views, and then more specifically defined'and'indicated in the appended claims.

Figure 1 is aside elevation, partly in section, of a tone-arm embodying my invention;

Fig. 2 is a detail sectional view taken on the line 2-2 of Fig. 1; and

Fig. 3 is a detail bottom plan view of the co-acting elements of the tone-arm.

In carrying outmy invention, 1' provide a tone-arm member lof any desired construction and configuration. The'tone-arm is adapted to be pivoted to the top of the motor board of a cabinet in such a manner that it may be swung over the turn-table in the plan of the turn-table as is common. The tone-arm member may be tapered from the base 2'to the free end?) thereof. 'Itmaydecrease in diameter from end to end by means of steps, or its diameter may be reduced from the base 2 to the free end 3 by a combination of tapered andstepp'ed portions.

Inthe free end 3 is pivoted an elbow 4 carrying at'its outer extremity a soundbox 5 having a reproducing stylus 6. The diameter of the elbow is less than that of the -free end 3 of the 'tone-armmember 1 and thatportion which engages within the member l is spherical inorderto fill the end of A screw 7 passes through the elbow d'wher eby the latter is pivoted so as to be-capable ofpivotal movement perpendicular to the horizontal her 1. j

A pin'8 is'loosely carried in the walls of thee lbow in proximity to the spherical poraxis of the memtion. The pin has a reduced extremity 9 at one end thereof and a peripheral groove l0 atorn'ear its center. Thepin may be readily "removed'from the elbow through the perforation 11 with which that portion of the pin having the greatest diameter engages, The Pin-went ber mo rem its posit-1011 movement in the opposite direction for the reason that the body of the pin cannot be passed through the perforation 12 with which the reduced extremity 9 of the pin enga es.

lllngaging the groove 10 of the pin 8 is the forked extremity of a trigger 13 which extends toward the open end of the elbow. A finger piece 14 projects from the under side of the trigger and extends through a slot 15 in the under side of the elbow.

The free extremity of the trigger 13 is provided with a downwardly inclined spur 16 which passes through a notch 17 in the under side of the free end of the elbow. The free end of the tone-arm member 1 is provided with a notch 18 in its lower wall and in line with the notch 17 and the spur 16. A spring 19 is wound around the pin 8 and one extremity of the spring engages the upper wall of the elbow and the other end of the spring bears down on the trigger and retains the latter in position with the finger piece 14 in the slot 15 and the spur 16 in engagement with the notch 17.

The operation is as follows The device is shown in operative position in full lines in Fig. 1, with the stylus resting in a record groove in the record disk which is supported on the turntable. The engagement of the stylus with the record is by gravity. It will be noted that the soundbox and stylus may assume a position lower than that shown in full lines.

When it is desired to raise the sound-box for the purpose of changing the record, renewing the stylus, or for any other reason, the sound-box is grasped by the hand and raised to the position'shown in dotted lines in Fig. 1. The spring 19 will be deflected by the engagement of the spur 16 with the lower wall of the member 1 and when the elbow reaches the position shown in dotted lines the spur will be snapped into the .notch 18 and the elbow will be firmly locked against downward movement.

Both hands of the operator will now be free to change the record or needle, and no amount of force exerted in the downward direction will move the elbow.

When it is desired to move the sound-box to playing position, the elbow or sound-box is grasped by the hand. One finger of the hand grasping the member is brought into engagement with the roughened exposed end of the finger piece 14. Pressure of the finger against the finger piece will not release the spur from the notch 18 but the elbow 4 must be raised an extent suflicient to permit the extremity of the spur 16 to pass the base of the notch 18 when the trigger 13 is caused to pivot on the pin 8 by the pressure on the finger piece 14. When the spur is released from the notch 18 the sound-box may be lowered to bring the stylus into engagement with the record. The screw 7 on which the elbow 4 is pivoted acts as a stop to prevent excessive movement of the trigger. which latter will engage the screw before the spur 16 can be moved out of the notch 17 The engagement of the spur in the notch 17, and the piece 14 in the slot 15, will retain the trigger in the center of the elbow and the engagement of the forked end of the trigger with the groove in the pin 8 will prevent withdrawal of the latter.

If, for any reason, it becomes necessary to remove the trigger or the spring 19, the screw 7 is removed and the elbow 4 is separated from the member 1. The trigger may now be moved upward until the spur and finger piece are disengaged from the notch and slot respectively. The jaws are withdrawn from engagement with the groove 10. The trigger may be removed through the open end of the elbow, the pin withdrawn through the hole, and the spring will fall out of the elbow. To reassemble the parts the operation just above described is reversed. p

In accordance with the provisions of the patent statutes, I have described'the principle ofmy invention together with the apparatus which I now consider to represent the best embodiment thereof, but I desire it understood that my invention is not confined to the particular-form of apparatus herein shown and described, and, therefore, Iclaim broadly the right to employ all equivalent instrumen'taliti'es coming within the scope of the appended claims, and by means of which objects of my invention are attained,

and the new results accomplished, as herein set forth, as' it is obvious that the particular embodiments herein shown and described are only illustrative of some that can be employed to attain these objects and accomplish these results.

Having now described'my invention,what I claim and desireto secure by Letters Patent is 1. A tone-arm comprising a tubular memher, a tubular element pivoted in the member and capableof pivotal movement in the direction perpendicular to the line of the axis of the member, a pin carriedby the element,

a trigger pivoted to the pin, a portion of said trigger projecting through a wall of the element, there being a notch in the member for engagement with the trigger, and a stop for limiting the, pivotal movement: of the trigger. v

2. A tone-arm comprising a tubular member, a tubular element pivoted in'the member and capableof pivotal movement n-t'ne direction perpendicular to the line of the axis of the member, a'pin carried by the element, a trigger pivoted to the pin, there being a slot in theelement, a portion of said trigger projecting through a slot, there being a notch in the member for engagement with the trigger, and a stop for limiting the pivotal movement of the trigger.

3 A tone-arm comprising a tubular member, a tubular element pivoted in the member and capable of pivotal movement in the direction perpendicular to the line of the axis of the member, a pin carried by the element, a trigger pivoted to the pin, there being a slot in the element, a portion of said trigger projecting through the slot, there being a notch in the member for engagement With the trigger, a stop for limiting the pivotal movement of the trigger, and a spring for maintaining the portion in the slot.

4:. A tone-arm comprising a tubular memher, a tubular element pivoted in the member and capableof pivotal movement in the direction perpendicular to the line of the axis of the member, a pin loosely carried by the element, a groove in the pin, a trigger, said trigger having a notch engaging the groove in the pin, a finger piece carried by the trigger, there being a slot in the element through which the finger piece projects, there being a notch in the extremity of the element. a spur on the trigger for engagement with the notch, the extremity of the member having a notch for engagement of the spur to lock the element to the member, a sprin engaging the trigger and the element, the pivot connecting the element to themember forming a stop to limit the movement of the trigger.

This specification signed and witnessed tnis 2nd day of January, 1919.

' LOUIS D. NADEL. Witnesses:

JOHN L. Lo'rsoH, M. Jones.