US1395353A - Universal tapping-machine - Google Patents

Description

W. C. OSTERHOLM. UNIVERSAL TAPPING MACHINE. APPLlATloN FILED 0m26.191s.

Patented Nov. 1, 1921..

' w. c. osTERHoLM. UNIVERSAL TAPPING MACHINE.

APPLICATION FILED DEC. 251 1918- Patented Nov.

n liliiiilmlnlmu Iwan/@0r UNITED STATES WILLIAM C. OSTERI-IOLM, 0F CHICAGO, ILLINOIS.

UNIVERSAL TAPIING--MACI-IINE. v

Application filed December 26, 1918.

To all w 710m t may concern Be it known that I, WILLIAM C. OSTER- HoLM, a citizen of the'United States, residing at Chicago, in the county of Cook, and State of Illinois, have invented certain new and useful Improvements in Universal Tapping-Machines, of which the following is a full, clear, and exact specification.

This invention relates to tapping machines, and machines of like character.

In order that a tapping machine may successfully perform its function, and operate efliciently and accurately, the toolmust be so mounted that it can vbe easily and quickly adjusted to the desired position, or, in other words, can be easily and quickly centered. Unless the tap is accurately centered the screw thread will not be true, and the tap litself may be broken. The object of this invention, therefore, is to render the operation of tapping accurate and eflicient.

A further object is to reduce the tapping expense by eliminating breakage, and shortening the time required lfor the tapping operation.

With these and other objects in view, the invention is embodied in an adjustable mounting for the tool, so constructed that the tool can be quickly vand easily adjusted in the desired direction, and can be held Yor locked in the desired position of adjustment.

A furtherv feature ofthe invention is ernbodied in a work holding means for securely holding the work against accidental movement so thatthe adjustment of the tool need not be changed after the tool hasbeen properly,` alined with the work. l

In the accompanying drawings the invention has been illustrated in connection with atapping machine, but it should be understood that my invention is equally desirable en drilling` and reaming machines, and that the use onsuch machines is contemplated, and it is my intention to cornprehend all such 4 uses in the appended claims.

I have illustrated oneembcdiment of .my invention in the drawings accompanying thisapplication, and in these drawings- Figure 1 shows a yfront elevation of my improved machine;

Fig. 2 is a side elevation of the construction shown in Fig. .1; Y

'Fig 3 is a detail view showing the work holding means; and Y Specification of Letters Patent.

Patented Nov. 1, 1921.

Serial No. 268,344.

Fig. 4i is a sectional view on an enlarged scale showing the hand-wheel and lever for operating the tool.

'Ihe invention is illustrated in connection .with an upright tapping machine, including the usual pedestal 10, having secured thereto a slide base 11. A work table support 12 is slidably mounted on the base 11, and has a dove-tail connection therewith, and a clamping screw r13 secures the work table support in place on the base 11. A base 14 is also slidably mounted on the slide base y11, being connected therewith byy a dovevtall connection, and having a clamp 15 for securing the base 14 in place on the slide base `11. The work table 16 is rotatably mounted on the work table support 12, and

is provided with a series of apertures located yin the circumference of aV circle described ywith the center of .rotation of the table as the center of the circle.

A locking pin 17 is reciprocably mounted on the work table support 12, and is located in a position to enter any one of the apertures in the work table above described. The kpin 17 is provided atitslower end with ja slot, through `which extendsone arm of a` lever18, which is pivoted at` 19 to the work table support, and has its kopposite arm 2O actuated in a downward direction by means of .a spring .pressed plunger 21 also carried by the work rspring 27, which bears at fone end against a collar 28 secured to the rod' 26. .and at its opposite end against any outwardly proj ect* ing lug 29 carried by the slide base 11. Near its lower endthe rod'26 has secured thereto f. a hanger V30,v having outwardly extending projections 31 and 32. The lower' end of therod 26 extends into ahanger 33, having corres Ondinev outwardl7V extending )rojections 34 and 35. rrrlhe projections 32 and` r Se and V31 and 35 are connected respectively by means of coil springsV 36 and 37. VThe hanger 34 is secured to a rod 38, which is pivotally connected at .its lowerend to a foot .treadle 39 pivoted at 40to ,the base of the pedestal. The treadle is provided near `its front endl with a slot 41 and a lug 42 projecting over a portion of the slot.

In order to lock the treadle in its lower position, I have provided a pivoted latchL 43 having a notch 44 inone edge thereof, and normally pressed forwardly by means of a spring 45. As the treadle is pushed down the wall of the slot engages the upper beveled edge 46 of the treadle, and forces the latch rearwardly until the treadle reaches its lowermost position, when the lug Y 42 comes into engagement with the notch 44,

, quick operating mechanism for securing the work to the table and may be` as quickly released to permit removal of the work after the tapping or drilling operation. Owing to the yielding connection 31-37 work of varying sizes may be clamped vto the table 16 without adjustment lof the clamping means. Y

rlhe adjustable mounting for the tool will now be described'. The base 14 above described supports vertical standards 47 for the vertically'adjustable support frame 48,

which is vertically slidable on the standards 47 5 and is provided with a split sleeve clamping member 49, which secures the frame in the desired position of adjustment. The standards 47 Vare connected at their upper ends by across rail 50, to which are secured idlers 51.

.A counterbalancing means is provided for the supporting frame 48, and consists of a series ofweights 52 carried by suitable casing 53 secured tothe base 14, and connected by means` of a cable 53 to the supporting frame 48, the cable passing over the idlers 51. yThe tool 54 and tool spindle 55 are mounted for endwise and rotary movement in a saddle or adjustable supporting frame 56. The frame 56 is horizontally adjustable on guideways 57 carried by the supporting frame 48, and is provided with overlapping `flange members 58 which secure Vthe frame 56 against displacement. 'A clamping screw 59 is carried by the frame 56, and clamps the flanges against the ways in such a manner asV tohold the saddle or frame 56 in the desired positioniof adjustment.

An operating wheel 60 is secured to the outer end of the spindle 55, and is provided with a slideway formed .by parallel flanges 61, which project inwardly or overhang toward the center of the wheel. A Vcrank Varm -is insured.

62 is slidably mounted in the slideway, and is provided on its inner surface with a plurality of indentations 63, which are adapted to be engaged by a ball 64 carried by the wheel, and forced outwardly by the spring 65. A handle 66 is mounted on one end of the crank arm 62.

The operation of the machine above described will now be brieiiy set forth. The castings to be tapped or drilled, as the 'case may be, are placed' on the worktable 16, which is rotatably adjusted as desired, and the operator then presses downwardly on the foot treadle and brings the'work clamping member 24 into contact with the work, this member being held in clamping contact by means of the treadle locking member'43. riihe hand screws 49 and. 59 are then loosened, if they are not already loose, and the operator-grasps the handwheel 60 and guides the tap orother tool 54 into the desired position of adjustment. During this guiding of the tool the frame 48 is freely movable vertically on the standards 47, and the saddle or frame 56 is freely movable in the guideways 57 carried by the standard '48, the counterweights 52 assisting the: op-

erator by taking up the weight of the tool, spindle, saddle, and supporting frame. When the tool has been adjusted to the desired position, the hand screws 49-and 59 are tightened, and the topl or other tool is forced into the aperture and the spindle 55, which is rotated by means ofthe crank arm 62, the amount of leverage being determined by the positionof adjustment of the crank arm 62 on the handwheel 60.

From the above description it will be seen that the adjustmentof the tool may be made very quickly and accurately by the use of my improved mounting, and that the whole operation is exceedingly simple. By means of the` quick and accurate adjustment, the liability to breakage of the tool is greatly Vdecreased and the accuracy of the operation While I have, in the above specification,

described one embodiment which my invention may assume, it should be understood that the invention is capable of modification,

standards, counterbalancing means for said supporting frame, a saddle a'djustably mounted on said supporting frame, and a spindle mounted in saidy saddle for rotary and endwise movement.`

2. In combination, a machine frame, supporting standards carried thereby, a supporting frame vertically adjustableon said and that modicationsl may be made without standards, clamping means for securing said ysupporting frame in the desired position of adjustment7 a saddle horizontally adjustable on said supporting frame, clamping means for securing said saddle in the desired position of adjustment, and a spindle mounted in said saddle for rotary and end- Wise movement.

3. In a tapping machine, the combination of a main frame, a Work table adjustably supported thereon, quick operating clamping means for clamping the Work to the table, and adjustable tool-supporting means comprising a base adjustably mounted on the main frame and having vertical standards, a supporting frame adjustably mounted on the standards, a saddle adjustably carried by the supporting frame, a tool-carrying means mounted in said saddle for rotary and endwise movement and means for operating the tool carrying means.

4l. In a tapping machine, the combination of a main frame, a Work table supported thereon, quick operating yieldable clamping means for securing the Work to the table, a tool spindle adjustable both vertically and horizontally on the frame and adapted for rotary and endwise movement, and means for operating the spindle.

5. In a machine of the class described, the combination of a main frame, a Work table supported thereon, a clamping arm pvoted to the Work table, a pedal pivoted to the frame, yieldable connections between the arm and pedal, means for holding the pedal in Work clamping position, an adjustable and rotatable tool spindle mounted on the frame in operative relation to the Work table, and means for operating the spindle.

In testimony whereof I affix my signature.

WILLIAM C. OSTERHOLM.

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