US1824769A

US1824769A - Centering device for lathes

Info

Publication number: US1824769A
Application number: US419667A
Authority: US
Inventors: Broden Edwin Natanael
Original assignee: Individual
Current assignee: Individual
Priority date: 1930-01-09
Filing date: 1930-01-09
Publication date: 1931-09-29
Anticipated expiration: 1948-09-29

Description

sept. 29, 1931. I E, N BRODEN h 1,824,769

CENTERIG DEVICE FOR LATHES Sept. 29, 1931. E. N. BRODEN 1,824,769

CENTERING DEVICE FOR LATHES Filed Jan. 9, 1930 ZSheetS-Sheet 2 'AT1-SRP! EH:

Patented sept. 29, 1931 EDWIN NATANAEL BRODEN, 011* noXnpnY,Massaeirpsnrfrsl CENTERING Davies non LArrrrss 'Application filed January 9,'1930. Serial Nm 419,667.

My invention relates to improvements in centering device for lathes and more especially for jewellers lathes, andthe objects of my improvements are, first, to provide a device to hold the spotter and, second, a device for lifting the spotter away from the work dur'- ing operation of drilling.

I attain these objects by the mechanism illustrated in the accompanying drawings, in

Fig. 1 is a side view of my centering device shown in position for centering or spotting the Work. K

Fig. 2 is a side view showing my'centering i5 device with the spotter arm raised and out oi' the way of the work.

Fig. 3 is a plan view of Fig. V1. l

Fig. 4 is a front view of the spotter arm, showing the spotter affixed to same.

n F ig. 5 is a side view of the spotter` arm showing the slot for spring adjustment.' Fig. 6 is a side view of the spotter. Similar numerals refer to similar parts throughout the several views. l j

1 is the tail stock of a lathe carrying a slidable spindle, 2 is the spindle attached to drill chuck 3, 31 is the drill. On'the end of spindleA 2 is loosely pivoteda lever 4, to one end of said lever 4 is a'loosely pivoted arm im 5, this arm is pivotally connected'to a'projection 6 on tail stock.

On the top of tail stock or.` spindle carrier is attached a latch or catch 7, this latch is tached to the spindle carrier, on the front end of latch 7 and on top is a hook 9. n

The underside is a cutaway portion 10, this cutaway portion lOforms a projection. This latch 7 is loosely pivoted at 11, and on the 40 rear end of latch 7 is an outwardly turned projection 12. On the arm 8 is also a pro,- jection 13, this projectiony has a screw attachment 14 whichregulates the movement of the arm 7. On arm 7 4isaliiXed'a spring 15,one arm attached to arm 7,. and the other end attached to a projection 151 on the tail stock 1. This spring 15 holds thearm 7 in position. On the spindle2, and rigidly att-ached to the rearof drill chuck Vis anarm r n l c 90 16, on this arm 16 1s fastened an angle iron supported and heldin place by an arm 8, at.

.Y is up.

,the front en d of, which .acts as;a.sup,port ,fori the spotter arn1i118. This Lsptter .anni

islslottechat 19V toallo'w movenientof said arm 18. This movement is controlled bya spring 20, which surrounds spotter arm 18.

On this slotted spotter arm 18 is a pivot 21, this pivot extends on each side of said arm, the inner end to hold spring 20 in place, and the outward end runs through a slot 22 on an arm 23 which is pivoted to arm 16, and on one end of this arm is a projecting piece 24. 25 is the head of spotter arm 18, the head holds the spotter' 26 in place by a set screw 27. 28 is the work clutch and 29 the work to be drilled. In operating my centering device, it is moved forward as in Fig. 1. This shows in position ready'to be spotted or centered. lThe spotter arm 18`is then moved back by lever 4 until the projection. 24 on arm 23 comes in contact with the'cutaway portion 10 on arm 7. This Voperationthrows the spotter arm up as in'F ig. 2 ofthe drawings and away from the work which is now readyA to be drilled; To release spotter arm and bring it down to position for spotting or cenj tering, this device is moved back by lever 4 vuntil the projection 24 on arm 23 comes in contactrwith catch 9which releases the spotter arm. The projection 24 after the arm is lifted stays under the shoulder 10'until the spindle is moved towards the left.` The arm 18 cannot godown because the projection' 24 on arm 18 does not catch on to the hook 9 on the front end of latch. 7 until the next backward movement to the right, when the hook 9 is dropped down, a slot 11 in latch 7 allows it to drop. In Fig. 2`the projection 24 on arm 18 is not on the same level as in Fig. 1, l it is raised up, that is the reason the arm 18 The projection 24 on arm 18 hooks ontol the hook 9 ifmoved to the right.

Heretofore the spotter 26 was placed on and also taken off the work to be spotted by hand.4 v

Having now fully described my invention, what I claim is :-f y

In a device of the 'class described, a tail stock support, a tail stock spindle slidably mounted therein, means for sliding-saidspinim dle7 a chuck at one end of said spindle, an anl,gle piece near the other end of spindle, a latch loosely pivoted to said angle pieces, aspring Vfor urging said latch in one direct1on,van

angle piece near the forward end of the spindle ad] aoent to the chuck and having a transverse pivot, a spotter arm having a longirtudinalslot-mounted on said pivot, a lever pivotally mounted on the angle piece and having a longitudinal slot at its forward end and a rearwardlvV projecting portion having a catch to be engaged Vby the latch when the' spindle is moved rearwardly, a perforated plate slidably mounted on the spotter arm and having a pin to .engage the slot in the vlever and a spring interposed between 'said plate and the second mentioned an le piece.

'Y EDWIN NATANAEL BR DEN.l