US845360A - Recess-boring tool. - Google Patents

Description

110.845,36@ PATBNTBDPBB-26,1907. M. JUNGLING.

REGBSS BURING TOOL.

, APPLIOATIOI FILED 1111.223, 1904.

Ilo

UNITED STATES PATENT OFFICE.

RECESS-BORING TOOL.

Specification of Letters Patent.

Patented Feb. 26, 1907.

Application filed July 23, 1904. Serial No. 217.894-

To all whom t may concern:

Be it known that I, MICHAEL JUNGLING, a citizen of the United States, residing at Kingwood, in the county Aof Golquitt and State of Georgia, have invented new and useful Improvements in Recess-Boring Tools, of which the following is a specification.

This invention relates to a recess-boring tool; and the object thereof is to construct a recess-boring tool which will in one operation bore a recess having a portion of its length cylindrical in contour and the remaining portion tapering or conical in contour.

The invention aims to provide a recessboring tool which can be used in a machine or with a 4carpenters ordinary brace, and, furthermore, aims to provide the tool with means for automatically limiting the boring thereof and for automatically returning the boring-bit to its normal position.

The invention further aims to construct a recess-boring tool for boring at one operation a recess havmg a portion of its length cylindrical in contour and the remaining portion tapering or conical and which shall be simple in its construction, strong, durable, efficient in its use, and comparatively inexpensive to manufacture.

With the foregoing and other objects in view the invention consists of the novel combination and arran ement of parts hereinafter more specifica ly described, illustrated in the accompanying drawings, and particularly pointed out in the claims hereunto appended.

In describing the invention in detail reference is had to the accompanying drawings, forming a part of this specification, wherein like reference characters denote corresponding parts throughout the several views, and in which* Figure 1 is a sectional elevation of the tool. Fig. 2 is a side elevation showing the flaring cutter in its operative position. Fig. 3 is arear view showing the abutment-cage, and Fig. 4 is an inverted plan view of the deilecting-bar.

' Referring to the drawings by reference characters, 1 denotes arotatablecasing having an enlarged skeleton end. Said end is termed a cage The cage comprises a rin 2 of greater diameter than the casing 1, and said ring 2 is connected with the casing through the medium of a plurality of inclined arms 3 3a 3b, which haveintermediate their ends on their inner faces inwardly-extending integral protuberances 4 4a 4b. The protuberances have their inner ends segmentshaped in contour and which form a semicylindrical guide-passage for the sectional boring-bit, to be hereinafter referred to. The protuberances 4 4a 4b constitute what may be termed the boring-bit guide. The protuberances 4 and 4a of the arms 3 and 38L are apertured for a purpose to be presently referred to, and mounted upon the said protuberances 4 and 4a and the arms 3 and 3a is a deilecting-bar 5 for a flaring cutter which forms a section of the boring-bit and which will be hereinafter referred to. Each end of the delecting-bar 5 is provided with screwthreaded openings and through which eX- tend retaining-screws 6, engaging in the openings of the protuberances 4 4a of the arms 3 3 for securing said deiiecting-bar 5 in position to one side of the abutment-cage. The deilecting-bar 5 is cut away on its under face to form an angular guide-passage 7, through which travels the flaring cutter, to be presently referred to, the side Walls 8 of the passage 7 tapering inwardly as Well as extending in a diagonal manner, so as to cause the flaring cutter to move outwardly 0H the other section of the bit and causing the boring of the conical or tapering portion of the recess, such action not to be had until after the boring of the cylindrical portion of the recess. The guide-passage 7 is not arranged centrally of the deflecting-bar 5, but to one side of the center, and to prevent the engagement of the sectional boring-bit, to be hereinafter referred to, with the underneath face of the deflecting-bar 5 the same is cut away, as at 9, forming thereby an intervening space be- A tween the underneath face of the deflectingbar and the upper face of one section of the boring-bit.

The reference character 10 denotes the cylindrical boring-section of the boringbit and which has a flat side, as at 11. The cylindrical boring-section 10 is further provided with the cutting edges 12 13, the screw-point 14, and cutting edge 15. Mounted upon the flat side of the section 10 is the conical boring-section of the boring-bit and which is termed a flaring cutter 16. At its upper end the flaring cutter 16 is pivoted causes the flaring cutter 16 to extend atV an angle with respect to the guide-passage 7 in the deiiecting-bar 5.

project over the edge of the flat side of the cylindrical boring-section 10 until the boringbit has been in operation to form the cylindrical part of the recess.

The referencey character 23 denotes the shank of the sectional boring-bit and which extends through the casing 1, projects from the upper end of the casing 1, and is surrounded within the casing by a compression or extracting spring 24, the latter abutting at one end against the fixed collar 25 and at its other end against the lower end of the casing 1. The collar 25 carries a stop-pm 26, which extends through an elongated slot 27 in one side of the casing 1. The stop 26 limits the return movement of the shank of the bit, while the forward movement of the shank 23 of the bit is limited through the medium of an adjustable stop-collar 28, fixed upon the shank 23. Said collar 2S on the forward movement of the bit engages the upper end of the casing 1, consequently arresting the boring operation. The shank of the bit can be attached to an operating part therefor of a boring-machine, but if used in connection with a carpenters brace an extra socket 30 is employed.

The operation of the tool is as follows: The enlarged skeleton end of the casing 1 coming in contact with the piece of work which is to be bored, although revolving with the bit, owing to the arrangement of the stop-pin 26, stands in relative position, while at the same time the bit, which works freely up and down in the casing, -is forced into the wood by an operating-lever therefor attached to a boring-machine or carpenters brace, whichever the case may be, as it can be used in either. When the offset in the ilaring cutter 16 comes into contact with the deflectingbar 5, it forces the flaring cutter 16 against the side of the aperture being bored, thereby increasing the size of the hole gradually until stop-collar 28 comes in contact with the casing 1 at the top. At the same time the downward motion of the bit compresses the extracting-spring 24 by contact of the retaining-collar 25, which is held in position on Vthe shank of the bit by the stop-pin 26. The pin Working through the slot 27 in the casing 1t at The normal position of the flaring cutter is such that it does not the same time holds the casing 1 and boringbit in their relative positions. Now by relieving the force exerted on the lever of the machine or the carpenters brace, Whichever is in use at the time, the bit is operated, the tension on the extracting-spring 24, exerting its force on the retaining-collar 25, will force the boring-bit out of the hole before the casing 1 will leave its relative position from the piece of work which is being bored. At the same time the oii'set in the flaring cutter 16 in opposite or returning motion again comes in contact with the deflecting-bar 5, forcing the flaring cutter 16 back to its normal position before the casing 1 leaves its position, thereby assuring a smooth flaring hole larger at the base than at the top.

The tool, which operates automatically, can be used either in a boring-machine running at as high a speed as two thousand and two thousand five hundred revolutions per minute or in an ordinary carpenters brace, which is worked by hand, if desired. A hole can be bored straight part of the depth-say threeeighths or one-half inch from the top of the hole-before the flare commences, thereby giving the dowel or piece inserted a straight lsolid bearing, which will hold it more rigid than if the flare begins at entrance or top of the hole. Then by having a wedge inserted in the end ofthe piece which is to be fastened into the recess it spreads same at the bottom .and makes it impossible to pull out or Work loose without the use of nails or glue.

It is thought the many advantages of a recess-boring tool constructed in accordance with the foregoing description, taken in connection with the accompanying drawings, can be thoroughly understood, and it will furthermore be evident that changes, varia tions, and modifications can be resorted to without departing from the s irit of the in vention or sacrificing an of t e advantages of the invention, and I t erefore do not wish to restrict myself to the details of construey tion hereinbefore described, and as shown in the accompanying drawings, but reserve the right to make such changes, variations, and modifications as come properly Within the scope of the protection prayed.

Having thus fully described my invention, what l claim as new, and desire to secure by Letters Patent, isd

A recess-boring tool comprising a rotatable casing having an enlarged skeleton end forming a cage provided with a guide-passage, a deflecting-bar secured to said cage and provided with a passage opposing the passage in the cage, said passage in said deflectingbar provided with inclined walls, and a bit rotating with said cage and formed of two sections, one of said sections pivoted upon the other, said pivoted section provided with angularly-disposed portions, adapted to travel IOC) IIC

through the passage in the deflecting-bar and my hand in presence of two subscribing Witegage thl Walls of sakfi passage, eausing messes. t ereby t e defleotn o said ivote see- T tion, and the other of sgaid sect-ioiis of said bit MICHAEL TUB GLING 5 adapted to travel through the guide-passage Witnesses:

in the cage. W. W. AsHBURN, In testimony whereof I have hereunto set l D. F. ARTHUR.

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