US3741671A

US3741671A - Drill guide

Info

Publication number: US3741671A
Application number: US00105124A
Authority: US
Inventors: R Douglass
Original assignee: Individual
Current assignee: Individual
Priority date: 1971-01-08
Filing date: 1971-01-08
Publication date: 1973-06-26
Anticipated expiration: 1990-06-26

Abstract

A drill guide comprising attachment means adapted to be anchored to a work-piece, a drill bit holder rotating in a bearing, means for adjustably positioning the bearing and bit holder with respect to the attachment means.

Description

iJite States Patent [1 1 Douglass um 26, 1973 DRILL GUIDE 380,486 4/1888 Honinger 408/135 [161 Inventor Robert Douglass, 5108 will 2 23332 35132? 52338;:11: 408,114

I Street, Omaha, Nebr. 68152 v [22] Filed: Jan. 8, 1971 Primary Examiner-Francis S. Husar [211 App! 105124 Attorney-Hiram A. Sturges Related US. Application Data [63] Continuation of Ser. No. 716,413, March 27, 1968,

abandoned.

[57] ABSTRACT [52] [1.8. Ci 408/114, 408/135, 408/237 [51] Int. Cl B23b 45/14 A drill guide comprising attachment means adapted to [58] Field of Search 408/ 135, 1 14, 234, be anchored to a work-piece, a drill bit holder rotating 408/236, 237 in a bearing, means for adjustably positioning the bearing and bit holder with respect to the attachment [56] References Cited means.

- UN [TED STATES PATENTS 1,087,646 2/1914 Detrick 408/237 4 Claims, 3 Drawing Figures PATENIED Jun 2 5 191a INVENTOR Robert F. Douglass fwdw, M

DRILL GUIDE This application is a continuation of Ser. No. 716,413, filed Mar. 23, 1968, now abandoned.

FIELD OF THE INVENTION This invention is in the field of drill guides which are adapted to be taken to the work-piece itself, as is especially valuable when the work-piece is heavy or bulky and, therefore, difficult to move to a conventional drill press.

DESCRIPTION OF THE PRIOR ART The closest prior art patent is my earlier U.S. Pat. No. 2,561,914, issued July 24, 1951, and titled: DOWEL- ING JIG.

This earlier patent used a mounting for sliding longitudinally through an anchored guide for guiding the drilling motion and had a drill bit holder rotating in a bearing with the bearing movable toward and away from the mounting bar. In these features it was similar to the present invention.

In my earlier patent, the drill holder bearing block was movable toward and away from the sliding mounting bar by loosening a connection between the sliding mounting bar and a frame means connecting the drill bearing block to the sliding mounting bar. This construction made it necessary to first release and then lock this connection each time the drill bearing was moved with respect to the mounting bar, and yet there was no simultaneous possibility for rotation of the bearing block and drill holder about a longitudinal axis through the sliding mounting bar.

The U.S. Pat. No. 699,535 to B. F. Kelley, titled, DRILLING MACHINE, and which issued May 6, 1902, requires two loosening motions and two tightening motions in the process of shifting from one drill hole to another in a pattern on a same work-piece. This great cost may have been more acceptable in 1902, but with high labor costs today, progress is needed.

SUMMARY OF THE INVENTION A drill guide comprising attachment means adapted to be anchored to a work-piece, a drill bit holder rotating in a bearing, an elongated frame means connected to the bearing at one end, clamping means for connecting the other end of said frame to a rack bar slidable with respect to said attachment means in a manner such that said clamping means, when clamped, makes firm connection between the frame means and rack bar and such that when said clamp is loosened,.said bearing end of said frame means can be moved toward and away from said rack bar and can also be rotated about said rack bar for swinging in a plane at a right angle to an longitudinal axis through said rack bar.

BRIEF DESCRIPTION OF THE DRAWING FIG. 3 is a left-hand'view of FIG. 2 with the power drill, and with adjacent closer parts of a nut, a pair of uprights, and a'pair of clamping blocks being broken away.

The drill guide of this-invention is generally indicated at and has a chuck-supporting shaft 12 on one end of which the chuck 14 of a power drill 16 can be at tached, the chuck 141 being hereafter sometimes called a first chuck. On another end of the shaft 12 a drill bit holder or second chuck 20 is provided being threadedly received on a threaded end portion 22 of the shaft, which latter is on the opposite side of bearing means 24 from that end 26 of the shaft 12 which is received in the first chuck 14.

A suitable selected drill bit 28 is received in the second chuck or drill holder 20 for drilling into a wood piece 40.

A frame generally indicated at 50 rotatably carries the shaft 12 for rotation about a first axis 52.

The frame 50 is partly defined by two uprights 60 which have. vertical slots 62 therein for receiving lock bolt portions which latter have horizontal portions 71 which extend at a right angle to the vertically elongated uprights 60 directly through the slots 62.

The locking bolt portion horizontal portion 71 extends slidably through both slots 61) and has one of its ends threaded, as seen at 73, for engaging in a threaded nut 75 which is disposed against an outer side of one of the uprights 60.

The lock bolt 70 has a shoulder 76 on the outer side of that other one of the uprights 60 which is opposite the one against which the nut 75 bears.

The lock bolt 70 has a transverse or handle portion 78, on one end, which can be manually rotated for drawing the bolt into the opening 75 whereby the two uprights 60 are pressed toward each other by the shoulder 76, or in another sense, the upright 60 which has the threaded opening 75 therein is drawn toward the shoulder 76 and thereby toward the other upright 60, whereby a pair of clamping blocks 79 suitably fixed one to each of the uprights 60 are drawn toward each other since they are normally spaced apart and since the clamping blocks 79 are attached to the inner sides of the uprights 60, whereby in moving toward each other, they tend to clamp on a generally cylindrical rack bar 80, which latter has an axis 81 which shall be called the second axis of the drill guide.

The rack bar has longitudinally spaced notches 82 in its upper side.

The bar 80 extends through bearings slidably and rotatably and the bearings 90 are held in opposite ends of a body 92 having ears projecting upwardly therefrom on opposite sides of the rack bar 80. The ears are seen at 96 and are rotatably supporting a gear axle 98 which has a gear 100 mounted thereon disposed in mesh with the teeth 82 of the upper side of the bar 80 between the notches 84 of the rack bar 80.

The axle 98 has an enlarged outer portion extending beyond the cars 96 and is shown at and to which a ratchet wheel 112 is attached.

A rotation control lever 114 is provided and is rotatably attached to the gear axle portion 110 by suitable means and the lever 114 has a conventional reversible pawl mechanism mounted thereon and controlled by an adjustment trigger 170, whereby when the adjustment trigger is placed in different ones of two separate positions, the pawl mechanism 130 will reverse its action. For example, upon swinging the lever 114 in one direction about the gear shaft 98, with the trigger 1711 in a'first position, the gear axle 99 will be rotated in the said one direction, and upon swinging the will release the ratchet wheel 112 and will not rotate the axle 98. With the trigger 170 in a second position, the conventional opposite rotating and release of the ratchet wheel 112 will occur.

The clamping blocks 79 have a concave recess 77 in those surfaces thereof which face each other, the surfaces of the recesses 77 fitting closely against the cylindrical exterior 200 of the adjacent outermost end of the rack bar 81.

A bolt 200 is threadedly secured in the end of the rack bar 81 adjacent the blocks 79 and washers 206 are disposed between the head of the bolt 200' and the adjacent end of the rack bar 81 for preventing the clamping blocks 79 from coming off the rack bar 81.

I claim:

1. A drill guide comprising a shaft on one end of which a power drill maybe attached and on the other of which a drill bit holder is attached, frame means rotatably carrying said shaft for rotation of said shaft about an axis, an elongated forward drilling motion directing member extending in spaced parallelism with said shaft, means adjustably attaching said frame means to said directing member in a manner for adjustment of said shaft toward and away from said directing member and also for rotational adjustment of said shaft and frame means by swinging about a longitudinal axis through said directing member, said means adjustably attaching said frame means to said directing member comprising a clamping block assembly comprising two clamping block means disposed one on each of two opposite sides of said directing member movable with respect to each other so as to be clampable against opposite sides of said directing member, said block means being rotatable around the outer surface of said directing member about an axis extending longitudinally through said directing member, said frame means having at least one elongated portion disposed on an opposite side of said clamping block assembly, pressing means engageable with said at least one elongated frame portion and releasably pressing said at least one frame portion against one of said clamping block means to releasably fix the position of said at least one elongated frame portion with respect to said clamping block means, and said pressing means also causing a pressing of said two clamping block means tightly against opposite sides of said directing member, said drill guide further comprising a body member, means slidably mounting said directing member on said body member for longitudinal movement of said directing member with respect to said body member, said directing member and said body member having key and keyway means thereon to prevent rotation of said directing member with respect to said body member, and longitudinal movement causing means cooperatively correlated with said directing member and engageable with said body member for causing a longitudinal movement of said directing member with respect to said body member.

2. The combination of claim 1 in which said at least one elongated frame portion has a longitudinal slot therethrough extending at a right angle to said shaft, said pressing means comprising a lock bolt means having a shank extending through the slot of said at least one elongated frame portion and also through at least one of said clamping block means and at least into the other of said clamping block means, said lock bolt having a shoulder means thereon engageable with that side of said at least one elongated frame portion which is the side thereof which is opposite said clamping block assembly, and said lock bolt having an engageable means thereon for facilitating its rotation for clamping and release motions.

3. The drill guide of claim 2 in which said longitudinal movement causing means comprises teeth on said directing member and a gear rotatably mounted on said body and engaging said teeth.

4. The combination of claim 1 in which said longitudinal movement causing means comprises teeth on said directing member and a gear rotatably mounted on said body and engaging said teeth.

Claims

1. A drill guide comprising a shaft on one end of which a power drill may be attached and on the other of which a drill bit holdeR is attached, frame means rotatably carrying said shaft for rotation of said shaft about an axis, an elongated forward drilling motion directing member extending in spaced parallelism with said shaft, means adjustably attaching said frame means to said directing member in a manner for adjustment of said shaft toward and away from said directing member and also for rotational adjustment of said shaft and frame means by swinging about a longitudinal axis through said directing member, said means adjustably attaching said frame means to said directing member comprising a clamping block assembly comprising two clamping block means disposed one on each of two opposite sides of said directing member movable with respect to each other so as to be clampable against opposite sides of said directing member, said block means being rotatable around the outer surface of said directing member about an axis extending longitudinally through said directing member, said frame means having at least one elongated portion disposed on an opposite side of said clamping block assembly, pressing means engageable with said at least one elongated frame portion and releasably pressing said at least one frame portion against one of said clamping block means to releasably fix the position of said at least one elongated frame portion with respect to said clamping block means, and said pressing means also causing a pressing of said two clamping block means tightly against opposite sides of said directing member, said drill guide further comprising a body member, means slidably mounting said directing member on said body member for longitudinal movement of said directing member with respect to said body member, said directing member and said body member having key and keyway means thereon to prevent rotation of said directing member with respect to said body member, and longitudinal movement causing means cooperatively correlated with said directing member and engageable with said body member for causing a longitudinal movement of said directing member with respect to said body member.