US2826945A - Boring machine - Google Patents

Description

March 18, 1958 A, H, KLElNsORGE 2,826,945

BORING MACHINE Filed Sept. 2, 1955 2 Sheets-Sheet l FIG/lf .v

March 18, 1958 A. H. KLElNsoRGl-z 2,826,945

i BORING MACHINE Filed Sept. 2, 1955 2 Sheets-Sheet 2 United States Patent C 2,326,945v BORING MACHINE Adolph H. Kleinsorge, Amon, Mo., 'assgnor to W. B. Knight MachinerygCompany; St. Louis, Mo., a corporation of Missouri Applicafionsepfember z, '19ss,'sfi1Nu.- '532,229 6 claims." (cl. 77.-4)

This invention relates to boring machines, and more particularly to high-precision machines of this class.

Among' the several objects of the invention may be noted the provision of a boring machine with means whereby the spindle of the machine may be readilyl precisely adjusted as to its angle `in respect to the base of the machine, and whereby the accuracy of adjustment may be maintained; the provision of a vertical boring machine, and more'particularly a jig borer, having a base and a spindle-carrying column which extends upward from the base at the rear of the base, with means for readily preoutwardly anged as indicated at'23and ts between-the flanges 19 with yminimum'clear'ance. The column is supported :on three (and'only three) leveling screwsV 25, 27 and 29 which arev individually vertically movable for universal adjustment of the angular relationship of the column with respect to thebase, as will be made clear.

Screws 25 and 27 (see Fig. 4) are threaded in vertical tapped holes in the lower `flanged portion 23 of the column at opposite sides of 'the column and toward the front. Their upper ends areaccessible' for turning, and they have convex lower ends engaging in concave seats of pads 31. The latter have atlower surfaces engaging the upper surface 17 of portion 7 of base 1. Screws 25 and 27 are located on aline at right angles to't-he'flanges 19 (see Fig. l). The screw 29 v(see Fig. 6) is threaded in a vertical tapped hole in the upper part of the base extending upward towardthe' bottomof the column and located tocisely adjustingthe column in both front-to-rear and transprecisiony centering of the spindle of the machine in the head of the machine, and for elimination of play of the spindle in the head. Other objects and features will be in part apparent andfin ypart pointed out hereinafter.

rlhe invention accordingly comprises the constructions hereinafter described, the scope of the invention being indicated in the following claims. p

In the accompanying drawings, in which one of variousl possible embodiments of the invention is illustrated,

Fig. 1 is a'plan view of a jig boring machine constructed in accordance with this invention;

Fig. 2 is a side elevation of the machine;

Fig. 3 is a front elevation of the machine;

Fig. 4 is an enlarged cross section taken on line 4-4 of Figs. 1 and 2;

Figs. 5 and 6 are enlarged vertical cross sections taken on lines 5-5 and 6 6, respectively, of Fig. 1;

Fig. 7 is an enlarged vertical cross section'taken on line 7 7 of Fig. 3, with parts broken away;

Fig. 8 is a bottom plan ofFig. 7, partly in section on line 8-8 of Fig.V 7; and,

Fig. 9 isa perspective of an element shown in Figs. 7 and 8. l

Corresponding reference characters indicate corresponding parts throughout the several views of the drawings.

Referring tothe drawings, a jig boring machine of this invention is shown to comprise a base 1 having a front portion 3 on which is mounted a work-supporting table 5, and havinga raised rear portion 7. The table 5, as will be understood in the art, is movable iny front-torear direction and in transverse direction. Hand wheels for movingr the table are indicated at `9 and 11. A'rapid traverse and table feed motor is indicated at 13, and a table feed gear box at 15 (see Fig. 2).

The raised rear portion 7 of the base 1 has a generally horizontal upper surface 17 anked by upwardlyextending vertical flanges 19. These flanges 19 extend parallel to one another in front-to-rear direction. A spindlecarrying column 21 extends upward from the raised rear portion 7 of the base 1. The lower end of the column is ward the rear on a line extending through the screw 25 parallel to the flanges (see Fig. 1). The lower end of screw 29 is accessible for turning and it has a convex upper end engaging in the concave seat of a pad 31 having a flat upper surface engaging the bottom of the column. It will be seen from Fig. 1 that the threeleveling screws are located at the apices of a right triangle one leg of which is parallel to the flanges 19 and other leg of which is at right angles to the anges. The screws 25 and 29 are located adjacent one of the flanges 19 and the third screw 27 is located acrossk the column from the forward screw Each of the llanges 19 has .a series of` horizontal holes 33 therein (see Fig. 5). Screws 35 extend loosely through these holes and are threaded in tapped holes 37 in the sides of the lower end portion 23 of the column. The holes 33 are enlarged at their outer ends to provide sockets 39 loosely receiving the heads 41 of the screws. By tightening the screws against the inner ends of the sockets 39, the column may be clamped to the flanges, without disturbing the angular relationship of the column with respect to the base.

The column 21 has a spindle drive gear box 4d at its upper end which overhangs the front portion 3 of the base (see Figs. 2 and 3,). The spindle of the boring machine is indicated at 43. The column contains a spindle driving and feed motor 45. Thespindle 43 extends downward from the gear box and has a tool holder 47 fastened to its lower end (see Fig. 7). The lower end of the spindle 43 and the tool holder 47 are rotary Vin a quill 49. Upper and lower precision bearings for the tool holder in the quill are indicated at 51 and 53. The quill is vertically slidable in a passage 55 in the` forward end of the head 57 of the machine. The head itself is vertically slidable on a track 59 on the column. It will be understood in the art that the head contains adjusting mechanism for sliding it up and downon the'traclr, this mechanism being operated by a hand wheel 61. It will also be understood in the art that the quill (and the spindle) are vertically slidable in the head by suitable mechanism including a rack 63 on the quill, a pinion (not shown) in the head, and a hand wheel 65 connected to drive the pinion.

For accuratelycentering the quill in the head, and for eliminating play of the quill in the head, the head is provided with guide means 67 and 69 for the quill 49 at the upper and lower ends of the passage S5 in the head. lEach v guide means comprises an annular holder 71 which is fastened to the head 57 at the respective end of the passage 55 as by means of screws 73. The holder has an l axial passage 75 of conical formation convergent in outward direction with respect to the'head. The holder. surrounds a contractile metal bushing 77 having a cylindrical axial passage 79 for the quill. The bushing has 2,826,945 Y l 's y 3 a conicalexterior 81 in wedging engagement with the conical passage 75 in the holder 71. The bushing is provided with axially extending grooves 83 in its outer periphery for; `the purpose of increasing its resilience, but is not split. The bushing, at its smaller end, has a cylindrical portion 85 which is exteriorly threaded for reception of a nut 87. `The nut 87 seats in a recess 89 f in the outer end of the holder lThe nut-has kerfs 91 adapting it for turning by a spanner wrench to move the bushing axially outward with respect to the holder 71 thereby to effect contraction of the bushing. lt will be observed that the axial movement of the `bushing within the holder results in the application of radial compressive forces to the bushing which are distributed substantially uniformly around the bushing for substantially uniform contraction of the bushing.v The result is that the cylindrical form of the passage `79 in the bushing is maintained as the bushing is contracted.

It will be understood that in a jig boring machine, it

lis essential for precision work that the axisof the spindle be perpendicular to the plane of the table. The provision of the leveling screws supporting the column 21 makes it possible readily toadjust the column and spindle in order to attain the necessary degree of precision. By loosening the screws 35, and by turning appropriate ones of the leveling screws 25, 27 and 29, the column may be made to tilt in a front-to-rear vertical plane parallel to the flanges 19, and in a transverse plane at right angles to the flanges, thereby enabling universal tilting movement of the column for positioning the spindle axis 'perpendicular to the plane of the table. While there is only a slight clearance between the lower end of the column and the ilanges, the range of movement in adjusting the column is so small that there isno binding within the flanges. After adjustment of the column has beencompleted, the clamping screws 35 are tightened' to lock the column in position. Since the clamping of the column is sidewise, there is no disturbance of the adjustment of the column attained by the leveling screws.

The guide means 67 and 69 are adjusted by turning the nuts 87 4for precision centering of the quill and sliding of the quill without play. This is important, since if there is any play of the quill in its passage in the head, the holes `that are bored Will be elliptical, rather than cir-- cular, and inaccurate centering ofholes may result. The guide means are also adjustable for taking up wear.

While the invention is above described as it pertains to a jig boring machine,it will be understood that the principles of the invention are applicable to vertical boring machines in general,\and also to a horizontal boring machine of the type having a column extending upward from thebase. In the latter case, the adjustment of the column would 4be madeto make the spindle parallel to the base.

In view f the above, it will be seen that the several objects of the invention are achieved and other advantageous results attained.` n v As various changes could be made in the 'above constructions without departing from the scope of the invention, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

I claim: i

1. A boring machine comprising a base'includin'g a portion having a generally horizontal` top surface and upwardly extending parallelanges at the sides of said base portion,.a spindle-carrying column extending up from said base portion with its lower endbetweensaid anges, said lower end of the column fitting between said anges with only slight clearance, said column being supported on said base portion by means of three and only Vthree vertically adjustable leveling screws, two of said screws being located adjacent one of saidanges and the third adjacent the other flange at the apices of a right triangle one leg of which is parallel to said anges and the other leg of which is at right angles to the flanges, said screws being individually vertically adjustable for universal adjustment of the column relative to the base, and clamping screws extending horizontally through the flanges for clamping the column to the flanges after adjustment of the column by the leveling screws without disturbing the adjustment.

2. A boring machine as set forth in claim l wherein said clamping screws extend loosely through holes in the flanges and are threaded in the column and have heads on their outer ends for engaging the flanges.

3. A boring machine comprising a base having a front portion on which is mounted a work-supporting table and a rear portion having a generally horizontal top surface, said rear portion having upwardly extending anges at the sides, said flanges extending parallel to one another in front-to-rear direction, a spindle-carrying column extending up from said rear portion of the base with its lower end between said flanges, said column having an upper portion extending forward above the table and a spindle extending down from said upper portion, said lower end of the column fitting between said anges with only slight clearance, said column being supported -on saidrear portion of the base by means of three and only three vertically adjustable leveling screws, two of said screws being located adjacent one of said flanges and the third adjacent the other flange at the apices of a right triangle one leg ofiwhich is parallel to said tlanges and the other leg Iof which is at right angles tothe ilanges, ysaid screws being individually vertically adjustable for universal adjustment of the column relative to the base, and clamping screws` extending horizontally through Vtheflanges for clamping the column to the tlanges after adjustment of the column by the leveling screws without disturbing the adjustment.

4. A boring machine as set forth in claim 3 `wherein said clamping screws extend loosely through holes in the flanges and are threaded in the column and have heads on their outerends for engaging the anges.

5. A boring machine as set forth in claim 4 wherein the column has an outwardly flanged lower end portion, the forward screw of said two screws being threaded in said flanged lower` end `portion of the column and the rearward screw of said two screws being threaded in the rear portion of the base, the third screw being threaded in said flanged lower end portion of the column'across the column from said forward screw.

6. A boring machine as set forth in' claim 3 wherein there is a head on'the column, the spindle extending through a passage in the head, and wherein means is provided for centering the spindle and maintaining it centered in the passage in the head, said means compris Ving a contractile bushing carried by the head having axial- 1y extending grooves in its outer periphery, and means for applying compressive force to the bushing distributed substantially uniformly around the bushing for substantially uniform contraction of the bushing.

References Cited in the tile of this patent UNITED STATES PATENTS 142,416 Sheridan Sept. 2, 1873 643,260 j Tynan Feb. 13, 1900 1,248,794 `Becker Dec. 4, 1917 1,298,448 Brassill Mar. 25, 1919 1,483,393 Steber c; Feb. 12, 1924 1,565,980 Hughson et al Dec. l5, 1925 FOREIGN PATENTS 1,027,211 France Feb. l1, 1953

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