US2122763A - Cutter mounting - Google Patents

Description

lJudy 5, 1938'.

Filed Feb. 25, 1937 I l Y l I 6 i f l 2 Nil f/ .I 'Z L lll 1 l 5 N3 /0-8' I g 5 "sl 7' 0r/M 3 I I \I l* l 7w i /5v I 2 "/l I 4 v /8 ff l 'I l5 *YA- /6 El @A a'Cm/tll:

INVENTOR ATTORNEY Patented July 5, 19348.

PATENT OFFICE CUTTER MOUNTING Fred. C. Smith, Jr., Houston, Tex., assigner to Hughes Tool Company, Houston, Tex., a. corporation oi.' Delaware Application February 25, 1937, serial No. 127,578

vil'Claims.

The invention relates to cutters such as are employed upon reamers designed for use in deep well drilling. l

The invention pertains more particularly to they means for mounting and.l supporting the cutter I in the head of kthe reamer andhas for its object y the formation of a supporting block for the ends of the cutter pin which may be easily and quickly applied and locked.

I aim to provide a mounting for the cutter pin which is of simple and strong construction and easily secured in place so that it will not become loosened.

The invention resides particularly in the construction of the supporting block and its means of attachment in supporting -position in. the reamer head.

In the drawing herewith Fig. 1 is a side view of a broken lsection of the reamer head showing the cutter mounted therein by the use of my invention.

Fig. 2 is a transverse section on the plane 2-2 of Fig. 1. i

Fig. 3 is a perspective view block.-

Fig. 4 is a perspective view of the locking plate.

The head of the reamer may be of any desired construction. I show a head I of generally cylindrical contour with outwardly projecting ribs or bosses 3 thereon spaced apart vertically to include the reamer cutters between them. I show supports for three cutters, as will be seen from Fig. 2, but a different number of cutters may be used.

Adjacent each cutter the body oi the reamer is the cutter supporting block 1.

The cutter is shown asl approximately cylindrical but with its ends tapered as desired at 8 and 9 at the upper and lower ends respectively. Each end has thereon a bearing pin Ill to ilt within'a bearing opening Il within the bearing block 1. The-bearing blocks at each end are of the same construction. In Fig. 3 one of the bearing blocks is shown detached. The recess Il extends away from the cutter recess about halt` way through the block. The block is dovetailed longitudinally and tapered longitudinally to t loosely within the mortised recess 6 of the head. As will be seen from Fig. 2, l

each block is narrower in width than the recess I to permit the wedge plate I! to be 'introduced ofl the supporting into the recess beside vthe block and lock the block in place.

0n the side of the block away from the wedge, the block has a transversely extending rib I3 to fit within a keyway or groove I4 in the side of the recess 6, and there prevent longitudinal movement of the block in said recess.

'Ihe wedge plate, shown in Fig. 4, is wedge shaped both longitudinally and transversely. That is it tapers in thickness away from the end i5 and from the side I6. At the larger end the block has a. locking arm I1 at approximately right angles thereto, said arm having an opening I8 thereinto receive a cap screw i9, by means of which it is secured to the block 1. 'I'he double wedge shape of the wedge plate enables the plate to wedge the block 'l rigidly into position with the ridge l 3- thereon tightly fitting within the groove I4 in the recess 6 as will be seen in Fig. 1. It further tends to prevent the plate from being moved outwardly from the mortised recess 6 as will be obvious from Fig. 2. The locking plate will be driven into the position shown in Fig. 1 and then xed in that position by the cap screw I9. v

It will be clear that before the cutter 5 is placed in its recess 4,. the supporting bloclm 1 may be slipped over the ends of the pins I0 and the whole assembly moved as a unit into position ready to receive the wedges. The wedge plates will then be driven in place'to force the blocks into rigid engagement with the walls of the recesses 6 and the ridges .I3 thereon tted within the grooves I4. The cap screws I9 nx the wedgev plates to the supporting blocks 1. A lock washer 20 may be used to prevent release of the cap screw. The wedge plate engages against the taperedside of the block 1 and a very tight ilt of the assembled block and wedge in the recess 6 is thus obtained.

It will be noted that this assembly is very easily and quickly made. The parts are simple and economical to ymanuacture and may be replaced when worn without appreciable loss of time or materials. Toremove the'blocks, itis only necessary to unscrew the cap screws and by engaging a drift pin or wedge under the arm Il of the wedge plate, the wedge may be removed. The block will then drop free and may be removed.

f What I claim as new is: 1. A reamer body having a plurality of cutten pockets therein, a reamer cutter in each pocket,

a mortised recess at each end of each of said pockets, one side of each recess having a transverse groove, a bearing pin at each end of each cutter, a bearing block to receive said pin, said block being mortised to t loosely in said recess, a ridge thereon to engage said groove, and a longitudinally tapered wedge plate formed to engage the side of said block opposite said ridge and within said recess to wedge said block in position.

2. A reamer body having a plurality of cutter pockets therein, a reamer cutter in each pocket, a mortised recess at each end of each of said pockets, one side of each recess having a transverse groove, a bearing pin at each end of each 3. A reamer body having a plurality oif 'cutter pockets therein, a reamer cutter in each pocket, a mortised recess at each end of each of said pockets, one side of each recess having a transverse groove, a bearing pin at each end of each cutter, a bearing block to receive said pin, said block being mortised to t loosely'in said recess, a ridge thereon to engage said groove, and a longitudinally tapered wedge plate formed to engage the side of said block opposite said ridge and within said recess to wedge said block in position, a laterally extending arm on the larger end of said Wedge plate, and a screw to-secure said arm to said block.

4. A reamer body having a cutter receiving pocket, bearing block receiving recesses at the upper and lower ends of said pocket, [bearing blocks in said recesses, a cutter in said pocket, bearing pins at each end of said cutters to engage within bearing openings in said blocks, means at one side of each block intermediate its ends interengaging with the side wall of its recess to prevent longitudinal movement of the block in the recess, and means to force said block laterally 6. A quadrangular bearing block having a bearv ing recess therein for a cutter axis, said block being formed with an inner side wider than the opposite outer side to t a mortised recess, the other sides between the outer and inner sides being formed, one with a transverse ridge thereon :and the other side formed to taper longitudinally of the block to interflt with a Wedge shaped plate and a cap` screw engaging with said block at the end opposite said bearing recess."

7. A reamer body,v a cutter mounted thereon, longitudinally extending bearing projections on said cutter, a mortised recess in said body at each end of said cutter, a dovetailed bearing block in each recess having a. bearing socket to receive lone ofl said projections, said block being tapered on one side, a projection on the opposite side engaging the wall of said recess, and a Wedge plate to fit within said recess on the tapered side of said block and hold said projection in said wall.

8. A reamer body, upper and lower projections thereon, said projections having longitudinally mortised recesses therein, a cutter between said recesses, supporting blocks at each end of said cutter in said recesses, means to support said cutter rotatably relative to said blocks, interengaging means between one `side of each of said blocks and. the wall of its recess, and a wedge to engage between said block and the opposite wall of said recess and force said interengaging means into locking position.

FRED. C. SMITH, JR.

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