US1748639A - Shank and bit punch - Google Patents

Description

Feb. 25, 1930.x l L D11-50N l sHANK ANDBIT PUNCH Filed June 15, l1929 H75 ATTORNEY Patented Feb.` '1930 JESSE Dirson, or LrrrEE'roncoLoEnno, ASSiGNoE To INGEEsoLE-Enni) coivif'iiir or JERSEY` CITY, NEW JERSEYjv A coEPonATIoNz, or'1 KNEW JERSEY f' 'l This invention relates tol bore forming mai Y y n ytype having 'acollarI V against which thefsuryin part pointed out hereinafter. *Y

the invention SHANK AND'EIT runen Application filed.: June 13,

.'chines7 suchl asshank'and bit punches, but more I'particularly to' a throttle valve control for machines of this type.

One object' of the inventionis to facilitate the starting' and stopping of the `shank andv bit punch by enabling the percussive" element of the machine tobe set in yoperation without necessitating the manipulation of means other( than the'work intended to bere-bored. A Other objects willbe'in part obvious and Inthe drawings illustrating' n' and in which similar reference characters refer to'simila'r parts,

" Figure l is a longitudinal sectional elveva-r,l tion of ashank and b'itpunch constructed in accordance with the practice of the invention, y

and showing the throttle valve in the closed position, and

finsectionl of the punch showing the manner 'in which the throttle valve ishr'el-dfin'th'e open position. -fj p Q me y'Referring more particularly to the drawf ings, A designatesa shanky and bit punchV comprising a cylinderLB inrfwhich is formed -a pistonv Chamber@ to 'accommodate a reciprocatory hammer piston D-` fronthead forms a closure for r'the' front end of the cylinderB and a back head F servesl in a r'sifi-ni'lar"capacityuat therearward end ofthe f Y cylinder.

thev 'amwinfgs' the; hammer pistonl D is 'i-'llustratedffasl being of the v differential type having'a hea-d- Gr and a ste-m H; the rearward fendA J ofwhichis a rconstant pressure surface yfwhil*the forward surface' K landthe rear- 'wa-rd surfaceL lof th'ehe'ad Gare only intermittently exposed to pressure VVfluidi.,

.A The hammer piston'D'is provided with a Pisa socket' R for the reception of a pnnch pin S- adapted tore-form1the bore' of hol-low articles,v as'for instance,` a ypassage T in a drill 1929. f 'Serial Nt. 370,640.

The anvil block P may be of a well known face K of the piston D is adapted to Strike for driving the punch ,pin Sinto the' drill steel U. Vfritafpoi'nt on they anvil block adjacent therearward endof the piston chamber Gis a removableheadW. against which an end surface X of a recessY- in the piston D Y is of somewhat 'A smaller .diameter thanfthev main VVVbody `portion t of the",v anvily block vand .carries at its extreme rearward end a head b which acts as an abutment for a split'sl'eev'e c 'serving as a seatfor a springcl disposed fabout the end JZ. The rearward movement of the split sleeve c is limited by a shoulder Se in a cap]E seatedon -the rearward end of the back head F. Abutting therearwa'rd end of the back head F sfa split'sleev'e g through vwhich the endZ` of the anvil block is" adapted to'slide and Said sleeve acts as afseatforthe .y opposite'endof the spring CZ.

The distribution@pressure finirla-au15@ lis adapted to strike for driving' the punch pin Y' S rearwardlyas for instance for with-drawing piston chamberl is in this instanceeifected'by the stem Hof the piston'li) andpressu're Huid admitted into the rearward end ofthe piston chamber flows throughlan inlet"-'passage'`7L.4

leading toja point near'fthe forwafiden'd f thel piston chamber C, Suchpressurelfluid is; conveyed to i the rearward end ofthe.: piston chamber through a supplyppassage 'jlead-` cylinder B.

Fromy the supply passage-j branches' 'pas-v f Such pressur'efluid` Hows around neck'- in'- frorrr a' throttle valveI chamber 7c infy the the piston stem H'whichfoverruns thepassa'gc l o in the;rearward-limiting position ofY the piston-1).'A friexhaust'port'Bf-lntheeylcontrolled by the head G of the Thethrottle valve'chamb'erh may com- 1 'niunic'ate with a source of pressure -iuid'sup-- Y yply through apipel g and the flowf'of pressure llluidf'romV the throttle valve rchambergc is inder is Y piston.

controlled by a throttle valve r of the poppet type normally held closed by a spring s seat-ed with one end on the throttle valve `rand with its other end against a plug` t threadedinto the end of the throttle valve chamber 7c to tion coaXially with the punch pin S. The

lever u is preferably of Teshape, the bar m of which is provided at one end with an aperture y to receive a pivot pin e which may be seated with its ends 2 in the guide o. The opposite end 2 of the bar is adapted to oscillate-in a slot 3 in the guide and theends of said slot 3 may serve to limit the oscillatory movement of the lever u.

Ini the construction shown, the bar of the lever a lies across the end of a stem t of the throttle valve 7', and a spring 5 disposed about the free end of the stem a bears with one end against the bar 00 andr with its other end is seated in a cavity 6 in the cylinder B.

The function of thespring 5 is to normally maintain the lever u in its retracted position so that the throttle valve r may be held closed by its spring s. Y l

In theretracted position of the lever u a .bearing portion 7 thereof will be held at an elevation somewhat higher than the bottom of the groo've w and will thus liev across the path of the punch Vpin S.

In the following description of the operation of the device the course .of the pressure Huid from the valve chamber 7c to the piston chamber C and the distribution thereof will be omitted since the manner inkwhich this distribution is effected is well known as are also the elements whereby is distributed. The description of the o-peration will therefore be confined to thev pressure fluid controlling means, such as the throttle valve and the means whereby the throttle valve is actuated.

Whenever it is` desired toiset the machine in operation, the work, such as the drill steel U, may be laid on the bearmgportion 7 of the lever u and the work will 'o-scillate the lever u about its pivot e'. ,This movement -of the lever will cause the bar m to open the tion, that is, it will occupy a position in which `both the collars V and IV will be out of the range of travel of the hammer. piston (D. After the lever u has been depressed to a point where thedrill steel U will lie in the groove fw, the drillV steel may be pressed against the punch pin S and by continuing such pressure in a rearward direction, the collar V of the anvil block will be moved into the frontend of the piston chamber C to receive the blows of the hammer piston D. In this way the punch pin S will be rapidly driven into the drill steel. f

After the punch Ypin has plenetratedthe passage I in the drill steel to the desired depth, the drill steel U may be drawn away from the punch pin and, owing to the tendency of the heated metal to adhere to the punch pin S, the anvil block P will also be Vmoved forwardly with the drill steel. This movement of the anvil block will carry the collar V out of the range of the hammer piston and will move the collar TvV into the rearward end of the piston chamber to enable the surface X to strike thereagainst. In this way the punch pin S will be speedily withdrawn from the drill steel U. After the vpunch pin S has been removed from the drill Vother than the work for starting and stopping the punch. This is extremely desirable in devices of this character wherein the slightest delayin manipulating the pressure fluid controlling means, suchv as the throttle valve may result in ay strong engagement between the heated metal of the drill steel'and Y the comparatively cold punch pin S and, in

consequence, a considerable amount of time is frequently spent in efforts to remove the punch pin from the work.

I claim:

l. In a shank and bit punch, the combination of a cylinder having a pistonwchamber and a hammer piston in the piston chamber,

a punch pinv adapted to be actuated by the i piston, a valve chamber in thej cylinder, a

4passage for conveying pressure fluid'from the valve chamber toy the piston chamber, 4a throttle valve in thevalve chamber to control the passage, a guide vto support the work coaXially with the punch pin, and means pivoted on the guide adaptedto be actuated by the work for actuating the throttle valve.

2. In a shank and bit punch, the combination of a cylinder having a piston chamber and a hammer piston in the piston chamber, a punch pin adapted to be actuatedby the piston, a valve chamber in the cylinder, a passage for'conveying pressure fluid from the valve chamber to the piston chamber, a

throttle valve inthe valve chamber vto control the passage, a guide to support theWork ycoaXially with the punch pin, a lever pivoted on the guide and adapted to be oscillated in one direction by the Work for opening the throttle valve, and a spring ffor actuating the lever in the opposite direction.

3. In ashank and bit punch, the combination of a cylinder having a piston chamber f and a hammer piston in the piston chamber,

, a punchpin adapted to be actuated by the piston, a valve chamber Vin `the cylinder, a

passage lleading from the Valve' chamber to the-,piston chamber,.a throttle valve in the j valve chamber to control the passage, a guide secured tothe cylinder and havinga groove `to maintain the -Work coaxially With the punch pin, a lever pivote'd at one end to. 'the i guide and acting against the throttle valve, n

a bearing portion on the lever against Which v- Y pressure is applied by the Workf for opening the throttle Valve, and a spring acting against the leverto normally maintain the bearing portion ata higher elevation than the groove.- f

In testimony whereof I have signed this speciication.'

JESSE prrsoN.l k

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