US1316138A - Planoqrach co - Google Patents

Description

A. F.'BRUHY.

PHONOGBAPH STOP.

APPLICATION FILED mu: 19. ms.

Patented Sept. 16, 1919.

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- ATTORNEY THE COLUMBIA PLANonIz/WH cm. WASHINGTON, D. C

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AIJEXANDER F. BR'UHY, OFWEST BENID, WISCONSIN.

PHONO GRAPH-STOR.

Specificationof Letters fjatent. Patented 16, 1919 iip iicaubajfi eamne 19,1918. SerialNo. 240,770.

for phonographs and more particularly to a device of this character adapted to be used in connection with that type of phonograph having a revolving turn table adapted to support a disk record.

The primary object of the invention is to produce an automatic stop of simple construction and eflicient in operation.

A more particular object of the invention resides in the provision of a stop which is automatically released and actuated by movement of the tone arm.

A further object is to provide an automatic stop in which the releasing mechanism for the brake can be readily adjusted to permit timing of the stop with reference to the travel of the tone arm.

With these and other objects in view, which will be apparent as the description proceeds, my invention resides in the novel features of construction, combination and arrangement of parts as hereinafter de scribed and defined by the appended claims,

it being understood that changes in the precise embodiment might be made by those skilled in the art without departing from the spirit of the invention.

This invention in one practical form in which it may be embodied is illustrated in the accompanying drawing in which:

Figure l is a plan view of the invention shown in connection with a turntable and shiftable tone arm.

Fig. 2 is a section view taken on the plane of the line 22 of Fig. 1.

Referring now more particularly to the accompanying drawings in which 1 designates a turn table and 2 a shifting tone arm employed in standard types of phonographs, 3 is an attaching plate, which in the present instance I have shown positioned below the turn table. The attaching plate is provided with upward turned ends 4 having mounted in slots therein a slidable brake bar 5, the end 6 of which is bent upwardly and provided with a rubber sleeve 6 for engaging a depending flange 7 of the turntable. The

opposite end of the brake barfis provided with an offset extension 8 adapted to be engaged by a lug 9 carried by the tone arm :2.

Mountedupon apivotlO secured to the at tachin'g plate is a trip lever 11 provided with a flanged hub extension 1].. j A. latch 12 is loosely journaled upon the hub extension l1 and isheld lnto frictional engagmen-t with .the trip lever 11 by means of a U-shaped spring, the curved arms of which straddle the hub 11 and are, confined by the flange thereon.

By this construction it will be seen that the latch 12 will at all times be urged against the trip lever 6, causing a frictional bind between their abutting surfaces.

Secured to the brake bar 5 and connected to thelatch member 12 slightly over center is a spring 14 which urges the latch into engagement with a notch 5 provided in the brake bar and also forces and holds the brake bar into frictional engagement with the turn table upon the release of the latch.

Adjacent the latch member 12 and preferably a part of the attaching plate 3, is a stop lug 12 adapted to limit the releasing movement of the latch.

In order to time the tripping mechanism with relation to the different lengths of records, the stylus is placed upon the last sound groove of the record, whereupon the trip lever is manually actuated, irrespective of the latch, to abut the depending lug 9 carried by the tone arm.

It will be readily seen that the brake bar will hold the latch against movement in the one direction, while the stop lug 12 will prevent its movement in the opposite direction. Hence due to the yieldable connection be tween the latch and trip lever, independent adjustment of the latter can be readily made.

In operation, after a disk record has been placed upon the turn table, the tone arm is shifted until the stylus carried by the tone arm engages the outer groove of the record,

whereupon the depending lug 9 of the tone arm has engaged the projection 8 of the brake bar and actuated the same sufiiciently to engage the trip lever 11, which due to the frictional engagement between it and the latch member 12 being greater than the tension exerted upon the latch by the spring 14, Will cause the latch to be actuated, thereby releasing the brake bar and causing the same to be urged against the flange 7 of the turn table by the spring 14.

I claim:

The combination With a phonograph tone arm having a trip, of an automatic stop comprising an attaching plate, guides at the opposite ends of the plate, a brake bar slidable in said guides longitudinally of said at taching plate and having a braking portion at one end, the opposite end being bent laterally outwardly of the adjacent guide to form a resetting arm, said bar also having a notch, a pivot stud disposed to one side of the path of movement of the brake bar, a latch plate pivoted 011 said stud and adapted to engage in said notch, a trip arm extended from said latch plate and projected transversely of the bar and substantially in the same direction as said resetting arm, both arms being operated by movement of the tone arm in opposite directions, and a contractile spring having one end connected to said bar and the other end attached to said latch plate.

In testimony that I claim the foregoing I have hereunto set my hand at Milwaukee, in the county of Milwaukee and State of Vis- 'consin.

ALEXANDER F. BRUI-IY.

Copies of this patent may be obtained for five cents each, byaddressing the Commissioner of Patents,

Washington, I). C.

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