US1730429A

US1730429A - Device for boring noncircular holes

Info

Publication number: US1730429A
Application number: US734924A
Authority: US
Inventors: Irving C Jennings
Original assignee: Individual
Current assignee: Individual
Priority date: 1924-08-29
Filing date: 1924-08-29
Publication date: 1929-10-08
Anticipated expiration: 1946-10-08

Description

Oct. 8, 1929. 1. c. JENNINGS 1,730,429

DEVICE FOR BORING NONCIRCULAR HOLES Original Filed Aug. 29, 1924 2 SheetsSheet l c, T I a I 2z FD 21* Q a 11 .14" 1820 if l g 6 15 w H MW 1 v'f/lll .Il

IN m/v 'nm -JF/{Z 6.7 1202 W A TTORNE Y-S Oct. 8, 1929. I. c. JENNINGS DEVICE FOR BORING NONCIRGULAR HOLES Original Filed Aug. 29, 1924 2 Sheets-Sheet Patented Get. 8, 1929 Davies non nonrne NONQIR-CULAR noLns Application filed August 29, 1924, Serial N0. 734t,'924. Renewed March 11, 1929.

The object of this invention is to provide an attachment for machine tools so that the same can be employed for boring non-circular holes.

My attachment has been particularly designed for use on a boringmill or an engine lathe and will be particularly shown and described as applied to a boring mill.

To this end, the cross feed for the cross slide mounted on the cross rail of the boring mill to which the attachment is to be applied is disconnected, so that the cross slide can move freely on the rail, and an arm or attachment is secured to the cross slide and an annular cam is fitted on the work to engage said arm. This engagement preferably is made through a roller journalled in a bearing piece adjustably carried by the arm, which roller engages the outer periphery of the cam.

In using this arrangement, the work is first fastened on the table or face plate and is faced 0E and bored so that the cam can be secured thereon. The cam preferably has a depending fiange which can fitaccurately into the hole bored in the work. Then the attachment is brought into operation, whereby as the work is rotated the cross slide will be moved back and forth on the cross rail under the influence of the cam and an irregular or non-circular hole determined by the shape of the cam will be accurately bored in the work.

The attachment is advantageous in operation as the connection between the cam to the operating tool is very solid and strong, as the arm engages the outer periphery of the cam and the tool engages the work at the same side of the center.

The invention is illustrated in the accompanying two sheets of drawings forming part of this application for patent, in which-- Fig. 1 is a front elevation partly in section of a boring mill with my attachment applied thereto;

Fig. 2 is a plan view thereof;

Fig. 3 is a side elevation on an enlarged scale of the attachment; and

Fig. A is a cross-section of the parts illustrated in Fig. 3.-

Referring to the drawings, and in detail, A

designates the revolving table or base plate of a boring mill, 13-13 the two uprights, C the cross rail or carriage, and D one of the cross slides, which carries the ram E in which the cutting or boring tool F is secured. These parts are of the ordinary construction and require no detailed description. 1

In using my invention, the feed for the right hand cross slide 1) is disconnected so that the same can movev freely on the cross ran. bracket 10 which can be secured by suitable bolts to the side of. said cross slide D. A slide 11 is dove-tailedinto said arm or bracket 10 so that it can be moved relatively thereto, a nut 12, screw13 and hand wheel 14 being provided for this purpose. A roller 15 is mounted on a pin 16 secured in said slide, a ball bearing being preferably used between the roller and pin. w

The work W is secured on .the table in any desired way. Thetop oftlie'work is first faced off andthen a rib or fiange17 on the top thereof isbored out accurately. A cam piece is then secured on top of the work. I

This cam .piece preferably consists of a'circular piece 18, which has a depending flange 19, which is of a size tofit accurately into the circular hole bored in the rib 17, and a cam shaped piece 21 fastened by screws 22 to the circular piece 18. The circular piece 18 is secured to the work by bolts 20. This cam construction is adapted so that the cam surface 21 can be easily machined and can be replaced as desired. After the cam piece is secured to the work, the toolis adjusted to engage the inside periphery of the work and it is fed The attachment consists of an arm or down therein by the usual feed employed in the cross slide for that purpose.

By the arrangement described, the cross slide willmove back and forth on the cross rail under-the infiuenceof the cam and the tool will bore an irregular shaped or noncircular hole conforming to the contour of the cam 21. By adjusting the wheel-14E the cut of'the tool can be regulated.

A heavy spring 23 is arranged betweenthe cross slide D and a stationary part, so that the cross slidewill be pulled to the left to keep the roller in engagement with the cam.

As the engagement of the cam with the roller determines the cutting position of the tool, it will be seen that a very smooth and accurate hole can be bored by the means described, as spring of the parts is practically eliminated as the strain due to the cut is takenvby the arm or bracket 10 which is se-v cured directly to the cross slide 1).

As the engagement of the roller 15 with the cam section 21 and the engagement of the tool F with the inside of the work W take place at the same side of the center of the work as shown in the plan, Fig. 2, it will be seen that the push of the cam is transmitted to force the cutting tool into the Work through very few parts and that an accurate irregu-= lar shaped hole will be bored in the work as spring of the parts is practically eliminated.

The details and arrangements herein shown and described may be greatly varied by a skilled mechanic without departing from the scope of the invention as expressed in the claims. V 7

Having thus fully described my invention, what I claim and desire to secure by Letters Patent is 1. The combination in a machine tool of a revolving face plate, a cross rail or carriage, a cross slide fitted loosely thereon, a ram or tool holder fitted in the cross slide, a cam adapted or arranged 'to be connected or mounted on the work,and an attachment on the cross slide engaging the outer periphery.

of the cam at the same side of the center that the tool engages the inside of the work.

2. 'The combination in a machine tool, of a revolving face plate, a cross rail or carriage,

a cross slide fitted loosely thereon, a rain or tool holder fitted in the cross slide, an annular cam adapted or arranged to be connected or mounted 011 the work and an attachment secured to the cross slide and engaging the outer periphery of the cam at the same side of the center that the tool engages the inside of the work.

3. The combination in a machine tool, of a revolving face plate, a cross rail or carriage, a cross slide fitted loosely thereon, a ram or tool holder fitted in the cross slide, and an attachment consisting of a bracket secured to the cross slide, a slide adjustably carried thereby, and a cam adapted or arranged to be connected or mounted on the work and engaging the slide.

4. The combination in a machine tool, of a revolving faceplate, a cross rail or carriage, a cross slide fitted loosely thereon, a ram or tool holder fitted in the cross slide, and an attachment consisting of a bracket secured to the cross slide, a slide adjustably carried by said bracket carrying a roll, and a cam adapted or arranged to be connected or mounted on the work and engaging the roll.

5. The combination in. a machine tool, of a revolving face plate, a cross rail or carriage,

IRVING 0. JENNINGS.