US1312233A

US1312233A - Lbottow

Info

Publication number: US1312233A
Authority: US
Publication date: 1919-08-05
Anticipated expiration: 1936-08-05

Description

0. B. CAMP.

FULLERING BLOCK FOR ROCK DRILL BITS.

APPLICATION FILED JULY 24| 1917.

.Patentedmg 5, I9I9.

ou an or' nisi-entraran,l CALIFORIA, Ansinnen or one-nenn Toner a.

LENNN, F ENG-ELMINE, 'CLlFORNI .To all whom it may concern.' I Be it known 'that l, ORRIN B. CAMr, a c1t1- zen of the United tate's, residing at Engelmine, in the county of Plumas and Statel of California, have invented new and use-` ful llmprovernents in Fullering-Blocks for RoclrfDrill'Bits, of `which the following is a specihcation( 1 'lhe ob'ect of the present invention is tof provide a'device for swaging, sizing and fullering drill bits,

Means for sharpening Carrbits, used with drills, Vhave heretofore comprised only a block for swagin thebita block. for sizing it, and a die for orming the edgeA of ther-bit. llln, order to obtain sharpcorners on the ,bit it has heretofore been necessary/,"withfthe tools at resent on vthe market, first, to swage theibit etween'a 'pair of swagin'g'blocks, lthen to size it between a pair of sizin bloote, and then to press the end of the bit against ay die. But whilethis'processwould cause the-edge of the bit to correspond in a ycertain degree with the formof the die, yetv yit would onlydo so to a limited extent at -thecorners of the bit;z Conse uently, it has y been necessary to 1re-heat the it and repeat i the process until finally thedie was" provided with sharpcorners at its biting or cut 3U ting edge. 'lhe object of the. presentinvention "is to *ferm4 the bit with'sharp corners by-drawing l et or fullering its'corners.

lln the present invention l use only two blocks, namely, 'an upper bloot` and a lower bloclr, not only for swaging and sizing, but

also for fullering', that is, for drawing out i the corners of the bit so as to provide the bit i y with a sharpedge along its whole length.

y 3 'is `a bottom view of the `upperbloek;Fig..4 LiI is' a'v longitudinal section through the t5 l ln the accom anying drawing, Figurel is a perspective view of in improvedblocks lFig.. 2 is a plan view of t e lower block; Fig..

eferring to the drawing, 1 indicates; an

' upper block, and 2 aI lower block, of -a` pair per swaging surface 3 for thegreater part of its depth, its rear end terminating in an upwardly and rearwardly sloping surface 4.

i The lower block l Specification of Letters Patent. 2 Patented Aug, 5, 1919..A `application mea July a4, im?. serial 160.1132148. 4

ln one direction said upper surface extends other direction islimited by a vertical wall 6, and the upper surface 10 of the lower block behind said sloping surface l is Hush with the top of .said wall. ln like manner the to the end of the lower block, and in the corresponding end of the upper block 1 has a swinging-,surface l'which is datV and eithe swaging ing at'the rear end tapering and constituting y,

partof the block, that is to say,

esV

theend of the bit is received, said cavity be whena bit is placed between said portions o f the up er and lower blocks, in a heated and .there ore slightly plastic condition, and

the upper block is" pressed 'down upon the V lower block, the result' is to squeeze the bit downward and also to form' `a tapering end thereon, this being formed'by the two surfaces l and 9, against which the ven dof the bit is squeezed.

The other ends blocks 1, l2, constituteI fullering portions. hasvat its left hand end, `as

Vof the upper vand lower seen-in Figs. 1, 2,-a dat portion 12, which is V triangular in shape and is limited at the end of the block by a high wall 13 extending `along the end of the block and on the right hand side by a sloping surface 141. ln like mannerjthe upper' block is formed with the dat surface 16 and a sloping surface 17 lirnit ing the flat surface on one side; '0n the .other side ofsaid Hat surface is a de pression or mortise 18, in which the upper edge of the wall 13 lits. There is thus .a cavity which-is tapering or beveled on its right hand side and the width of which varies according to its `distance from the front end. After swagin `the bit in the manner just above describe f the bit is placed on the .lower block until its right hand corner rests upon the sloping surface 14 and then the upper bloclr` is brought down onit, thereby fullering or drawing out the right hand corner or end of the edge of the bit. When this has lbeen done it is turned over l'so that the same operation is performed on the other end of the bit. ln

1- formed,' whe'n said upper and lower blochs 'i are' fitted together,

ico

llt)

this manner the endsl of the edge of the bit are fullered or drawn out.

Both the lower and upper blocks are formed with registering conical recesses, the lower block with a recess 19 and the upper block with a recess 20, These recesses lie immediately to the left of the walls 6 and 8 respectively, which walls'therefore extend obliquely across the blocks. These recesses constitute the sizing part of the block, and

the bit is placed in said recesses and said blocks are pressed together in order to cornpress the corners to the correct gage to reduce the bit to the proper size to be afterward treated by the dolly in the die. The wall 13 is of great importance, for it fits in the mortise in the upper block and prevents the bit from slipping away from the sloping surfaces 4, 9, which it tends to do by reason of its being pressed between said surfaces.

' I claim:

Means for fullering a corner of a drill bit having two beveled cutting surfaces, coinprising two blocks, each havin a depressed, flat, 'swaging surface, one o said blocks having a wall o1' stop, an inner side of which is at right angles to the swaging surface of the block and the other having a mortise into which the upper portion of the block fits tightly, said blocks also having surfaces sloping upwardly from said swaging sur- `faces at an acute angle, the longitudinal directions of said sloping surfaces making an acute angle with said wall.

ORRIN B. CAMP.