US1891369A

US1891369A - Carrier for electromagnetic pick-up

Info

Publication number: US1891369A
Application number: US387842A
Authority: US
Inventors: Leslie F Curtis
Original assignee: American Bosch Magneto Corp
Current assignee: Ambac International Corp
Priority date: 1929-08-23
Filing date: 1929-08-23
Publication date: 1932-12-20
Anticipated expiration: 1949-12-20

Description

L. F. CURTIS Dec. 20, 1932.

CARRIER FOR ELECTROMAGNETIC PICK-UP Filed Aug. 23, 1929 INVENTOR Zzszzz F WW5 ATTORNEY Patented Dec. 20, 1932 UNITED STATES MAGNETO CORPORATION, OF SPRINGFIELD,

NEW YORK PATENT oFFIcET-f' LESLIE r. CURTIS, or SPRINGFIELD, MASSACHUSETTS, AssIGivon T AMERICAN noscir Application filed August 2 3, 1929. SrialNo. 387,842.

gitudinally with respect to said support, said arm being pivotally mounted on and rotatable with respect to said support.

Though the accompanying drawing shows the preferred embodiment of this invention, the invention may take other forms which are within the principle and scope thereof.

Fig. 1 shows the usual disposition of the electromagnetic pickup device within the playing compartment of a phonograph; Fig.

' 2 is a detail, partly in section, of the support and arm; Fig. 3 is a cross section through 3-3 of Fig. 2; and Fig. 4 is a detail showing the yoke which supports the arm.

Throughout the drawing like reference characters indicate like parts.

Fig. 1 illustrates a phonograph cabinet 1,

its turntable 2 and tone arm 3. Disposed within said cabinet, as shown, is the electromagnetic pickup device comprising the electromagnetic pickup 4., the arm 5, support 6 (indicated generally), volume control 7, and socket plug 8.

The sub]ect of this invention concerns only the construction of the support 6 and arm 5, the two being called also, for convenience, the carrier for the electromagnetic pickup 4..

The support 6 comprises a base 9 into which is inserted the rod or member 10 having a longitudinal groove 11 and a transverse hole 12 into which is permanently secured an arcuate-shaped spring element 13. A convenient way of securing the spring to said rod is by peening over 14, the metal of the rod, at the sides of the groove.

The function of the spring is to exert a ible yoke 16 hearing internally opposed

pins

17, 17, which are adaptedto engage-with perelements therein.

MASSACHUSETTS, A conronnrlolv'on yielding pressure between the inside of the base and the rodso as to avoid'rattle between the parts when in operation. Mounted on saidrod byqa rivet 1 5 forations 18 in the arm 5 and collar 19. I

The arm may or may not be perforated, if the collar is; and the collar'may bedispensed with and perforations provided inl'the arm.-

In any case the function'and coact-ion of the elements is the same. V The perforations are axially alined an permit the arm to be supported .at any one or another of points along saidaxi's. This per-.

phonograph cabinet or arrangement of: the' Thebase 9 is provided with an opening in the bottom thereof which is adapted to rebe secured to the cabinet.

At the unsupported end of the arm is mounted a bracket 21 to which is attached the electromagnetic pickup.

claim 1s:

1. A carrier for electromagnetic pickups comprising a base, a rotatable yoke mounted thereon having opposed pins, and an arm mits the device to be adjusted to any sizev of ceive a screw 20, whereby the support may Having described my invention, what I having depressions along its length engageable by said pins to provide means for adj usting the point of support of said arm.

2. carrier for electromagnetic pickups comprzsing a base, a rotatable rod mounted therein, a yoke mounted thereon having opposed pins, and an arm having depressions along its length engageable by said pins to provide means for adjusting the point of support.

3. A carrier for electromagnetic pickups comprising a base, a rotatable rod mounted therein, a yielding element between said rod and base, a yoke mounted on said rod having opposed pins, and an arm having depressions along its length engageable by said pins.

4. A carrier for electromagnetic pickups comprising a base, a rotatable rod mounted therein, a spring carried by said rod and in;v

yielding frictional engagement between said base and rod, a yoke mounted on said rod having opposed pins, and an arm having depressions along its length engageable by said pins.

5. A carrier for electromagnetic pickups comprising a base, a rotatable member mounted therein, a yielding element offering frictional engagement between said member and base, an armpivotally mounted on said member having a collar with axially alined perforations, and means carried by said member to engage said perforations.

6. A carrier for electromagnetic pickups comprising a base, a rotatable member mounted therein, a spring carried by said member and in yieldingly frictional engagement between said base and member, an arm pivotally mounted on said member having a collar with axially alined perforations, and

means carried by said member to engage said perforations.

-7. carrier for electromagnetic pickups comprising a base, a rotatable member mounted therein, a spring carried by said member and in yieldingly frictional engagement between said base and member, an arm pivotally mounted on said member havlng a collar with axially alined perforations, i

means carried by said member to engage said perforations, and a bracket mounted onsaid arm-to hold the pickup.

In testimony whereof I aflix my signature.

LESLIE F. CURTIS.