US946524A - Valve for the sound-boxes of talking-machines. - Google Patents

Description

C. K. SIMPSON.

VALVE FOR THE SOUND BOXES 0F TALKING MACHINES.

APPLICATION FILED MAY 22, 1909.

946,524, Patented Jan. 11,1910.

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CHARLES K. SIMPSON, OF HONOLULU, TERRITORY OF HAWAII. ASSIGNOR OF ONE- EIGHTH TO A. P. MCDONALD, OF HONOLULU, TERRITORY OF HAWAII.

VALVE FOR THE SOUND-BOXES 0F TALKING-MACHINES.

Specification of Letters Patent.

Patented Jan. 11, 1910.

Application filed May 22,1909. Serial No. 497,698.

To all whom it may concern:

Be it known that I, CHARLES K. SIMPSON, a citizen of the United States, residing at Honolulu, county of Honolulu, Territory of Hawaii, have invented certain new and useful Improvements in Valves for the Sound- Boxesof Talking-Machines; and I do hereby declare the'following to be a full, clear,

I same.

My invention relates to Sound-boxes for talking machines, which employ compressed air toprodu ce the sound, and particularly to the construction and action of the valve in such sound-boxes, through which the air is passed; and the objects of my improvements are, to increase the sound and improve the tone produced, and to decreasethe' compressed air expended.

My invention relates particularly to and is an improvement in that class of soundboxes illustrated in the French patent, No.

372,225, dated Nov. 24, 1906, in which a gridiron valve is employed, operated by a stylus which travelsover the record. In

this type, each'bar ofthe gridiron valve exactly covers a slotted opening in the valve seat, when the valve is closed. The stylus in following the record lifts the valve from the seat and in a direction at right angles thereto, allowing air to .issue through the openings in the seat, in intermittent jets, their -character and frequency depending upon the action of the stylus. One end of the valve, to which the stylus is removably attached, is mounted upon the seat in a manner such that the valve may be sprung from the seat by the action of the stylus in following the record; the valve in seating is guided by a pin in the seat passing through a hole or slot in the other end of the valve. The lifting of the valve is aided by the air, and resisted by the mounting at the stylus end and by a cushion at the other end.

My invention contemplates changes in the construction and action of the valve whereby much louder and more perfect tones are produced with the expenditure of less air. The principal changes of construction are: in the spring clamp, which flexibly secures the valve to the seat; in the shape of the guiding pin in the seat, against which the end of the valve rests. the pin being tapered and" thy-edge of the valve correspondingly beveled; and in the bars of the gridiron valve, one edge of each bar being beveled. The action of the valve is thereby changed, as will hereinafter more fully appear.

In the drawings, Figure 1 is a plan View of'my improved gridiron valve. Fig. 2 represents a plan view of its valve seat.

Fig. 3 represents a section on the line AB of Fig. 2. Fig. 4 is a detail of the cushion and its adjusting screw. Fig. 5 is a sectional view of a modification. Fig. 6 is an elevation of the sprin clamp. Fig. 7' is a diagram illustrating t e passing of the" air jets through an ordinary gridiron valve. Fig. 8 is a diagram. illustratingthe same through my improved valve. Referring to the drawings; the valve seat.

plate 1 is rovided with the parallel slots 2, a

. dowel 3 or holding seat plate in place, and

a pin 4-having a hardened tapered point 4 the pin 4 being preferably screwed in said plate. A's'pring clamp 5 is attached to the seat plate 1 by screws 6 in the holes 7 tapped in said plate. The spring clamp 5 is made weakest in a plane parallelto the seat plate 1. The stylus holder 8', which is'secured to the spring clamp 5, is provided with the screw 9 for s'ecuri. the stylus in the usual -manner. The hol er 8 has a pin-end 8,

which is clam ed by the set-screw 10 in the block '11. This block 11 is secured to the end 12 of the valve plate 12. The valve plate 12 is provided with the bars l3, forming a gridiron type of valve, adapted to'exactly cover the slots 2 in the seatplate- 1, when the valve is closed and at rest. The edges 13* of the bars 13 are preferably beveled and of greatest width at the inner or lower face of the valve to permit of a freer exit for the air and a sharper cut-ofl", Figs. 1 and 8. The end 12 of the valve plate 12 is notched, as shown in Fig.1, such that the beveled edge 14 engages thetaper 4 of the pin 4, and preferably approximately on' the cushion, which engages flie valve plate 12, is made so as to clear the screw 16, to permit of a freer'movement of the valve in following the taper 4 of the pin 4c when lifting.

The tapered pin and the cushion arrangeme'nt may, if desired, be combined, as shown in the modification, Fig. 5, in which the pin 4: is screwed into the seat plate land is provided with the lock-nut 20, the tapered portion 4* forming a shoulder. The pin 4 is extended above the tapered portion 4 and threaded 4 'to receive the adjusting nut 21.

When 'the valve lifts at right angles to theseat, as hasheretofore been'the practice, air is permitted to escape through the slots .inthe seat and pass between the bars of the valve,-fthe jets meeting as indicated by arrows in Fig. 7. With my improvements, however, the valve plate 12 in 'lifting from the seat plate 1, does not move at right angles to said plate, but moves away from the seat in a direction to the left hand in reference to the view of the valve shown in Fig. 1, being guided by the shape of the edge 14 which engages the taper 4* of the pin 4. This provides freer passages for the jets of air, as will be notedby reference to Fig. 8.

,the valve laterally as it lifts.

2. In a sound box valve, a'lifting valve, a stylus holder carried thereby, a valve seat,

and means to guide the valve laterally with respect to the seat during the lifting movement of the valve. 1

3. The combination with a valvefbr a sound box, and a seat for-the valve, of a tapered guide member for the valve which causes it to shift laterally'jdu'ring its lifting m 'ovement. Y I 1. 111' a sound box valve, a valve seat, a valve, a stylus holder carried by the valve, and a tapered guide pin on the seat'which moves the valvelaterally as it rises from the seat.

5. In a sound box valve, .a valve seat, a

tapered guide pin carried thereby, a valve having a beveled edge engaging said' pin, and a stylus holder mounted on the valve. 6. In a sound-box valve, a valve seat, and agridiron valve, each bar of said valve being beveled at one edge and of greatest width at the inner or lower face of the valve. 7. A sound-box valve having a plurality of parallel bars, one edgeof each bar being straight and the other edge beveled, for the purpose described. i

8. In a soundbox'valv e, the comblnation of a valve seat, a gridlron valve, a screw 16 for adjusting the parts, and a cushion 19, ,the end of which clears said screw, as described.

9. Ina sound-box valve, a valve seat comprising a seat plate 1, avalve'plate 12 having abeveled edge 14, and a ide pin 4 against which beveled edge 14 a uts.

In'testimony whereof I afli; my signature,

in presence of two witnesses.

I CHARLES K. SIMPSON.

Witnesses: if

A. P. MoDonanm. Roms "J. PRATT.

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