US2189039A

US2189039A - Reamer

Info

Publication number: US2189039A
Application number: US244523A
Authority: US
Inventors: William L Childs
Original assignee: Reed Roller Bit Co
Current assignee: Reed Roller Bit Co
Priority date: 1938-12-08
Filing date: 1938-12-08
Publication date: 1940-02-06
Anticipated expiration: 1957-02-06

Description

Patented Feb. 6, 1940 UNITED. STATES PATENT OFFICE REAMER poration of Texas Application December 8,1938, Serial No. 244,523

Claims.

This invention relates to reamers for use in the drilling of wells. It has for its general object the'provision of a structure by which a reamer cutter of the roller type may be firmly 5 and securely mounted on a reamer body.

In mounting reamer cutters on reamer bodies it is essential that they be mounted as firmly as possible so that there will be no possibility of play between any of the parts constituting the in mounting during the operation of the reamer. It is also essential that the mounting be such that it cannot become undone so as to release the cutter either partially or wholly from its mounting during the reaming operation.

1:, It is desirable that such mounting. permit of easy and quick dismounting of the reamer cutters and the remounting of substitute cutters.

It is, therefore, an object of this invention to provide a structure for mounting a reamer cutter in a recess in the side of a reamer body in such a manner as to give the greatest possible degree of rigidity to the mounting, prevent any play or lost motion between the parts of the mounting during operation, and at the same time utilize the smallest possible number of parts and eliminate any parts which might easily be broken or distorted.

It is a further object of this invention to provide a structure wherein a reamer cutter may be readily mounted on and dismounted from the reamer body without necessity for any extraordinary skill or for any unusual tools to accomplish the mounting or removal.

Another object of this invention is to provide a structure which will make possible the changing of cutters of a reamer in the field without necessity for sending the reamer back to the factory for a. change of cutters.

Other objects and advantages will become apparent from the following description taken in connection with the accompanying drawing, it being understood that the same are by way of illustration and example only.

In the drawing:

Fig. 1 is a side elevation of a reamer body constructed in accordance with this invention, showing the reamer cutters in place therein.

Fig. 2 is a vertical cross section through one wall of the reamer body illustrated in Fig. 1 and m through one of the cutters mounted therein, the same being taken along the line 2-2 of Fig. 1.

Fig. 3 is a partial horizontal cross section taken along the line 33 of Fig. 2.

Fig. 4 is a partial horizontal cross section taken along the line 4-4 of Fig. 2.

Fig. 5 is a partial horizontal cross section taken along the line 5--5 of Fig. 2.

In accordance with this invention, a reamer body l is provided with a major recess 2 therein adapted to receive a reamer cutter 3, and with g a minor recess at one end thereof and a second minor recess 5 at the opposite end thereof adapted to receive respective supporting blocks 6 and l for supporting the reamer cutter. The recesses 1 and 5 both taper in the same direc- 3% tion with respect to the body i. That is, the recess 4 tapers to a smaller dimension in a direction away from the major recess 2, whereas the auxiliary recess 5 at the opposite end of the major recess tapers to a smaller dimension to- 3d ward the major recess 2. Both of these auxiliary recesses t and 5 taper toward the outer contour of the reamer body. That is to say, they are each narrower at the outer contour of the-reamer body than at the bottoms of the respective reit cesses. The blocks 6 and l are correspondingly shaped and tapered so that when either of the blocks 6 or the block l is forced downwardlyas seen in Fig. 1 it will tend to wedge tightly between the sides of its recess and to be drawn as in toward thecenter of the reamer body. The tail of the auxiliary recess 5, or that end most remote from the major recess is made of greater width than the remainder of this auxiliary recess as indicated at 8. The lower end of the an auxiliary recess 3, or that end most remote from the major recess 2 is widened to provide an enlarged chamber-like recess 9. Both of the blocks 6 and l are provided with bores extending there through. The bore through the block 7 is sub- 3g stantially cylindrical and adapted to receive the upper end iii of the shaft on which the cutter 3 is to be rotatably mounted. This shaft is preferably made integral with the block '5 by means of welding H or the like. The opening through w the block 8 is tapered to a smaller dimension in a direction away from the major recess as shown at l2 and the shaft it is provided with a tapered portion i3 adapted to fit this tapered opening in the block 6. A smaller extension it of the shaft l0 projects into the enlarged recess t and is threaded on its end. A washer i5 surrounds this projecting end M and a nut i6 is threaded onto the end to hold the washer. Tightening of this nut will obviously draw the block i into tighter wedging engagement with the auxiliary recess 5, will draw the tapered portion 4 3 of the shaft it more tightly within the block 6, and will draw the block 6 into tighter wedging engagement with the auxiliary recess. a

In assembling the device just described, the body I is first formed as above set forth, the shaft I is then welded at ll into the block I. The block '6 is placed within the recess 4, the cutter 3 is inserted into the major recess and held in substantially proper position. The block 1 is inserted into the minor recess by first placing it within the part 8 of this recess and then sliding it longitudinally, guiding the shaft I ll through the central portion of the cutter 3 and through the block 6 until the end of the shaft projects into the enlarged recess 9. The washer I5 is then put in place over the end of this shaft and the nut l6 threaded onto the shaft and tightened. The act of dismounting the cutter from the reamer body is the exact reverse of that described.

From the foregoing it will be seen that a means has been set forth for carrying out all of the objects and advantages sought by this invention, including the provision of a device which is extremely simple and easy to manipulate while at the same time providing for the rigid mounting of a cutter without any substantial possibility of its becoming accidentally removed or released.

It is to be noted that the mounting provided makes possible the manufacture of the cutter and mounting parts for the cutter and the transportation of these parts to the scene where the tool is being used, and the subsequent repairing of the tool by removing the worn cutters and replacing the said cutters with new cutters.

Having described my invention, I claim:

1. In a reamer construction, a reamer body having a major recess in its outer surface and a smaller auxiliary recess at each end of said major recess, each of said auxiliary recesses tapered toward a smaller dimension in the same direction longitudinally of the reamer body and in a direction outwardly from the center of the said reamer, a correspondingly tapered block in each of said auxiliary recesses, a cutter in said major recess, a shaft secured to one of said blocks and passing through said cutter and the other of said blocks, and means for moving said shaft longitudinally with respect to said body to cause said blocks to wedge tightly in their respective auxiliary recesses and secure said cutter in proper position with respect to said body.

2. In a reamer construction, a reamer body having a major recess in its outer surface and a smaller auxiliary recess at each end of said major recess, each of said auxiliary recesses tapered toward a smaller dimension in the same direction longitudinally of said body and in a direction outwardly from the center of said body, a correspondingly tapered block in each of said auxiliary recesses, a reamer pin having its ends carried by said blocks, respectively, and extending through said major recess, a reamer cutter rotatably carried by said pin within said major recess, and means for forcing both blocks in the same longitudinal direction with respect to said body to wedge it tightly within said auxiliary recesses.

3. In a reamer construction, a reamer body having a major recess in its outer surface and a smaller auxiliary recess at each end of said major recess, each of said auxiliary recesses tapered in the same longitudinal direction, and a correspondingly tapered block in each of said auxiliary recesses, a reamer pin having its ends carried by said block, respectively, and extending I through said major recess, a cutter rotatably carried by said pin within said major recess, and

means for forcing both blocks tightly into said auxiliary recesses.

4. In a reamer construction, a reamer body having a major recess in its outer surface and acting therebetween for forcing said blocks tightly into said auxiliary recesses.

5. In a reamer construction, a reamer body having a major recess in its outer surface and a smaller auxiliary recess at each end of said major recess, each of said auxiliary recesses being tapered in the same longitudinal direction with respect to said body, and a correspondingly tapered block in each of said auxiliary recesses, a reamer pin extending between said blocks and through said major recess, a cutter rotatably carried by said pin within said major recess, and means engaging said blocks and said body and acting therebetween for forcing both of said blocks in one longitudinal direction with respect to said body into said auxiliary recesses.

WILLIAM L. CHILDS.