US1856896A

US1856896A - Drill bit

Info

Publication number: US1856896A
Application number: US384941A
Authority: US
Inventors: Harve M Wheeler
Original assignee: Individual
Current assignee: Individual
Priority date: 1929-08-10
Filing date: 1929-08-10
Publication date: 1932-05-03
Anticipated expiration: 1949-05-03

Description

May 3, 1932. H. M. WHEELER DRILL BIT Original Filed Aug 10, 1929 Fatented May 3, 1932 Lasts umrao STATE-S P'ATET OFFICE.

mvn x. nun, or nousron, arms I name Application fled August 10, 1929, Serial No. 384,941.. Renewed larch 7, 1982.

This invention relates to new and useful improvements in a drill bit.

One object of the invention is to provide a drill of the character described, embodying a head, and detachable cutters secured thereto in a novel manner, the cutter securing means being readily releasable to permit the detachment of the cutters from the headfor repairs or replacements.

Another object of the invention is to provide a drill having a head formed with spaced prongs and cutting members insertable between the, prongs ofthehead with releasable means. for securing the cutting members. in the head, said securing means also being formed so as to. reeniorce the prongs and to prevent the spreading or distortion thereof.

With the above and other objects in view the invention has particular relation to certain novel features of construction, arrangement of parts and use, an example of which is given in this specification and illustrated in the accompanying drawings wherein:

Figure 1 shows a side elevation of the drill partly in section.

Figure 2 shows a side view thereof taken at right angles to the view shown in Figure 1. Figure 3 shows a transverse sectional view taken on the line 3-.3 of Figure 1, and

Figure 4 shows a fragmentary vertical sectional view taken on the line 4-4 of Figure 1. Referring now more particularly to the drawings wherein like numerals of reference designate similar parts in each of the figures,

the numeral 1 designates the drill head whose upper end is reduced and formed into an outwardly threaded shank, adapted to receive a drill collar by means of which the drill may be attached to a drill stem. The lower end of the head has a deep transverse roove 3 therein, forming said lower end into the

spaced prongs

4, 4, the outer sides of whose lower ends converge or taper downwardly as v shown in Figure 2. i

There are the

cutting members

5, 5 of any desired type, the fish-tail blade type being shown, these cuttin members have the flat shanks 6 insertable rom opposite sides of the head into the deep groove 3 and-into abutting relation. Each shank 6 has a transverse rib 7 on its rear side, which fits into a corres onding groove on the inner side of, the ad acent prong 4. @n each side of the head there is a vertical dove tailed groove 8, each groove extending from near the upper end of the head downwardly to near the lower ends of the prongs 4, and slidably mounted in the respective grooves 8 are the plate like

keys

9, 9, which are provided to lock the cutting members 5 against detachment from the head. When in their lowered position, the lower ends of the keys 9 abut the lower ends or the corresponding grooves 8 and rest against the external shoulders 10 of said cutting members and said keys are retained by the set screws 11 which are screwed into the head and abut the upper ends of said keys and lock them in position. When the keys are so locked in place they abut the outer edges of the cutting members 5 and prevent their detachment.

In order to remove the blades, the set screw 11 may be removed and the keys 9 elevated and the cutting members 5 then slipped outlaterally from the groove 3. The keys 9 have the inwardly

turnedmargins

12, 12, as shown in Figure 3, said inwardly turned margins working in the

longitudinal grooves

13, 13 which extend inwardly from the side marins of the dove tailed grooves 8. When the eye 9 are in position to lock the cutting members 5 in place, these ribs 12 will also serve to reinforce the prongs and to prevent the same from spreading or becoming distorted under the strain to which they are subjected by the cutting members while the drill is at work.

The bit head has the usual water courses 1%, 14 leading downwardly t-herethrough, which extend on down through said prongs and discharge on the forward sides of the respective cutting members.

The drawings and description disclose what is now considered to be a-preferred form of the invention, butby way of illustration only while the broad principle of the invention will be defined by the appended claims.

[What I claim is:

1. A drill including a drill head having a transverse end groove forming one end of the head into spaced prongs, cutting means fitted into said grooveand projecting out beyond the head, removable retainer plates on the head, on each side of the cutting means and forming means for securing the cutting means against detachment from' the head, ,said prongs having longitudinal grooves forming seats, and said retalning means having longitudinal rojections fitted into said seats and bein e ective to secure said prongs against sprea ing.

2. A drill including a, drill head having a transverse groove across one end thereof forming said end into spaced prongs, cut

ting means seated in said groove between the prongs and extending beyond the head, retaining means on the head, one on each side of the cutting means, provided to retain said cutting means against detachment from the head said retaining means comprising keys slidahle on the head into active positlon to so retain said cutting means and into inactive position to permit the removal of said cutting means for the head, said head having longitudinal side keyways, in which the keys are seated, and being formed with longitudinal side grooves which extend along the prongs, longitudinal projections on the keys which are fitted into said prong grooves and are efi'ective to secure the prongs against spreading.

3. A drill including a drill head having a' transverse groove across one end thereof forming said end into spaced prongs, cutting means seated in-said groove between the prongs and extending beyond the head, retaining means on the head, one on each side of the cutting means, provided to retain said cutting means against detachment from the head said retaining means comprising keys slidahle'bn the head into active position to so retain said cutting means and into inactive position to permit the removal of said cutting means for the head, said head having longitudinal side keyways, in which the keys are seated, and being formed with longitudinal side grooves which extend along the prongs, longitudmal projections on the keys which are fitted into said prong grooves and are effective to secure the prongs against spreading, and releasable means for locking said keys 1n such active position.

In testimony whereof I have signed my name to this specification.

HARVE M. WHEELER.