US1389569A - Drilling-jig - Google Patents

Description

J. F. FE'TTERLY.

DRILLING JIG.

APPLICATION FILED DEC.I8,1919.

Patented Aug. 30, 1921.

2 SHEETS-SHEET 1.

3 mm mm 5 .I. F. FETIERLY.

DRILLING JIG.

APPLICATION FILED DEC,18, 1919.

Patented Aug. 30,1921.

2 SHEETS-SHEET 2- INVENTOR Qm Q JOHN F. FETTERLY, OF ALTOONA, PENNSYLVANIA.

DRILLING-(FIG.

Application filed December 18, 1919.

Specification. of Letters Patent.

Patented Aug. 30, 1921. Serial No. 345,865.

(FILED UNDER THE ACT or Mason 3, 1883, 22 STAT. n, 625.)

T 0 all whom it may concern.-

Be it known that 1, JOHN F. Fn'rrnRLY, a

citizen of the United States, and a resident of Altoona, county of Blair, and State of Pennsylvania, have invented an Improvement in Drilling-Jigs, of whichthe followin is a specification.

Ihe invention described herein may be used by the Government, or any of its oilicers or employees in prosecution of work for the Government, or by any other person in the United States, without payment of any royalty thereon.

This invention relates to improvements in drilling jigs especially adapted for use in drilling test specimens or bars from gun forgings. Said device is preferably used in connection with a radial drilling machine of either the full or semi-universal type.

The objects are to provide simple, durable and inexpensive means whereby a gun forging from which a number of transverse test specimens are to be drilled, and the tool carrying arm may be so adjusted and locked, that said drillings may be made at any angle on a plane at right angles to the axis of the work.

Another object is to mount the drill carrying arm in such a manner as to permit its adjustment into positions in relation to the .work for drilling a plurality 01": specimens without disturbing or causing subsequent adjustment of the forging or work to be operated on after it has been once set and locked in position.

A further object is to provide means for firmly supporting the drill holder of the ordinary form or radial drill in such a man ner as to hold the drill to its work when entering the same and also to maintain the work as well as the drill in such a position as to prevent binding due to the feed of the tool through the work after it has been started.

Another object is to mount the work and tool in such a manner as to enable the adjustment of the work on its own axis, to bring other parts thereof, fromwhich specimens are to be taken, in line with the drill, without disturbing said drill and with little delay.

Similar numerals indicate corresponding shank of the arbor is an arm 31.

parts in all the figures or" the drawings in which Figure 1 is an drilling jig;

Fig. 2 is a vertical longitudinal section of elevation of the improved the tool carrying end of the drilling mechanism; V

'Fig. 3 is a vertical transverse section on line 3-3 of Fig. 1 showing dotted position of the tool supporting arm and its parts;

Fig. 4 is a detail vertical transverse section on line 14: of Fig. 1; and

Fig. 5 is a detail horizontal section on line 5-5 of Fig. 1.

Referring to the drawings by numerals, 1.0 indicates an adjustable block in which is mounted the chuck 11 adapted to support one end of the forging shown in dotted lines at 12. Said block is preferably mounted on the floor in line with the platen of an ordinaryform of radial drill.

A supporting bearing block 13 having a bearing 14 and flanges 15 is secured to the platen 16 of a radial drill (not shown) by bolts 17 and straps 18. Said bolts 17 are provided with heads 19, seated in grooves 20 in the platen, and nuts 21, to clamp the bearing block 13 in place on the platen within the sweep of the tool carrying spindle of a radial drill.

A clamping cap 22 fitting on bearing block and secured in position by bolts 23, securely clamps arbor 2a of the'work support in the bearing block.

The arbor, having the shank portion 25, is provided at one end with lever bar openings 26, and at its other end with head 27 in which pins 28 are provided for insertion into seats provided in the chuck 29.

The chucks 11 and 29 are provided with the usual adjustable blocks 30 for clamping a tubular forging 12 in place.

Mounted for rotary adjustment on the The inner end of arm 31 is provided with a split bearing adapted to be clamped on the arbor in any desired position by clamping screw 32 having cylindrical head 33 at one end provided with lever bar openings 34 and at its other end which is squared, with removable screw head 35-pinned at 36 to said screw.

Th clamping screw 32 is threaded as shown at 37 in arm 31. For convenience in adjusting the parts, screw head 35 is provided with lever bar openings 38, and with the lever bar openings 34 in the head end of the clamping screw, provide for adjustment of said screw from either of its ends.

The arm 31 is provided with a slot 39 closed at its outer end by arm plate 40 secured in place by bolts 41.

The slot 39 is provided on opposite faces with ribs 42. A flanged box 43 is slidable in the slot and is provided with an opening 44 for the reception of the tool guiding arm.

The tool guiding arm or bushing holder is provided with the smooth shank portion 45, the threaded portion 46 and head portion 47.

The shank portion 45 of the tool guider extends through a spacer 48 arranged between the head 47 and one face of arm 31, through the flanged box and only partly through washer 49 at the opposite face of arm 31. From a position within the washer 49, the shank is screw threaded as at 46.

A collar nut 50 is threaded on the shank of the tool holder and when screwed home securely clamps the tool guiding arm in place in the arm 31.

It will be noted that, owing to the flanged box 43 being slightly less than the thickness of the arm 31, and the threadedportion 46 of the shank extending within the washer, when the collar nut, having the lever bar openings 51, is tightened up, the inner faces of spacer 48 and washer 49 will be clamped against opposite faces of the arm 31 and securely hold the parts in position in the arm 31.

The head portion 47 of the tool guider is provided with an opening 52 in which pin 53 is seated to prevent rotary movement of a bushing 54, said bushing being mounted in the opening 55 of the head.

A hollow tool 56 for drilling test specimens is mounted in the drilling shank 57 of any preferred form of radial drill, said drill bar being mounted in the bushing 54 in the head of the drill guider, and is driven in a well known manner.

The operation of the improved universal drill jig is as follows: The gun forging is rigidly mounted on chucks 11 and 29. The drill tool is brought into proper position by the adjustment of arm 31 and tool carrier, and the clamping members 22, 32 and 50 tightened up, when the tool may be started and a specimen drilled from the forging.

By reference to Fig, 3 of the drawings, the parts are shown as adjusted into position for drilling specimens on either side of the center or axis of the work.

The drilling may be made at corresponding angles into the forgings and concentrically about the center thereof by setting the drill supporting arm at the desired angle and drilling the first specimen and then the subsequent drillings may be made by simply loosening'the clamping screw 32 and cap 22 and revolving the work to the next position, without disturbing the tool support, which will be held in position by the drill shank 57 of the radial drill, the clamped mounting of the tool guider, and the loosened mounting of the arm 31 on the arbor.

Having described, my invention, what I claim as new and desire to secure by Letters Patent, is z- 1. In a drilling mechanism, the combination with a work support, of an arm mounted on the work support and adjustable circumferentially around its support, and a tool guiding member mounted on the arm.

2. In a drilling mechanism, the combination with a work support, of an arm mounted on the work support and a tool guiding member mounted on the tool supporting arm and adjustable to bring the axis of the tool into a plurality of positions in a plane at right angles to the axis of the tool guiding member.

3. In a drilling mechanism, the combination with a work support of an arm mounted on the work support and adjustable circumferentially around the axis of the work support, and a tool guiding member mounted on the arm and adjustable to bring the axis of the tool into any position in a plane at right angles to the axis of the tool guiding member.

In a drilling mechanism, the combination with a work support of an arm mounted on the work support and adjustable circumferentially around the axis of the work support, and a tool guiding member mounted on the arm and adjustable to bring the axis of the tool into any position in a plane at right angles to the axis of the tool guiding member and work support.

5. A drilling machine having a rotatably adjustable work support, an arm adjustable about the axis of the work support, and a tool guiding member mounted on the arm with its axis parallel with the axis of the work support and adjustable to bring the axis of the tool into any position in a plane at right angles to the axis of the.tool guid mg member.

6. In a drilling machine, the combination of a rotatably adjustable work support, an arm circumferentially adjustable about the axis of the work support and mounted on the work support, and a tool guiding member adjustable on the arm.

7. A drilling mechanism consisting of a rotatably adjusting work support, an adjustable arm mounted on the support and a tool guiding member on the arm adjustable rotatably onits own axis and radially to the axis of the work support.

8. A drilling jig for test specimens consisting of a Work support having an arbor for rotary adjustment in a bearing block, an arm mounted. on and adjustable circumferentially around the arbor, a tool guiding member mounted on the arm and rotatably adjustable on its oWn axis and adjustable on the arm radially as to the axis of the arbor, and means for locking the parts in their adjusted position.

9. A drilling mechanism consisting of a rotatably adjustable Work holder, an arm circumferentially adjustable about the axis of the Work-holder, and a rotatably and radially adjustable tool guiding member carried by the tool supporting arm.

10. A drilling jig consisting of a Work support, an arm, a tool guiding member rotatably adjustable on its own axis and radially adjustable to the axis of the Work support, and common locking means for the rotary and radial adjustment of the tool guiding member.

11. A drilling machine consisting of a bearing block, a Work support having an arbor for adjustment in the bearing block, an arm mounted on and adjustable about the arbor, a tool guiding member mounted on the arm adapted for adjustments; rotatably on its own axis, longitudinally of the supporting arm and circumferentially around the Work support, and common looking means for the rotary and longitudinal adjustment of the tool guiding member.

JOHN F. FETTERLY.

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