US2890607A - Drill guide and stop - Google Patents

Description

June 16, 1959 R. w. MCLANE 2,890,607

DRILL GUI-DE AND STOP Filed Aug. '7, 1956 2 Sheets-Sheet 1 Fig./ Fi .2

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' Robe/'7 W, Mc Lane Fig. 5 INVENTOR. r5 72 74 93 73 I 92 J V wfi fi% United States Patent Ofiice 2,890,607 Patented June 16 1959 DRILL GUIDE AND STOP Robert W. McLane, Dayton, Ohio Application August 7, 1956, Serial No. 602,617

4 Claims. (Cl. 77-62) This invention relates to a drill accessory and partic ularly to a combination drill guide and stopwhich features both convenience and accuracy in the use thereof.

It is common experience of craftsmen who use hand tools, and particularly electric hand drills, that to drill a hole exactly perpendicular to the surface being penetrated is uncommonly difiicnlt without an aid of one type or another. Generally when an accurate perpendicular hole is desired the operation is performed on a drill press. It is a common experience in drilling a hole with a hand drill to aparticular depth, particularly in a thin piece of stock, that it is quite difficult without some makeshift or unhandy depth gauge to have the hole exactly the desired. depth. Accordingly, an object of the present invention is to provide a device which alleviates difliculties involved in both. these operations that is, obtaining perpendicular holes in a work piece and drilling to a preselected depth with accuracy.

Another object of the present invention is to provide an accessory for a hand drill which does not in any way become mechanically connected or coupled to the hand drill, but which coacts with the drill bit in such a way that the same accuracy is achieved in its use as if it were attached mechanically to the hand drill.

A further object of the present invention is to providean accessory having a base with a smooth flat surface that rests on the work piece, this base being formed with a passage that is in alignment with a corresponding passage on a guide, the guide being easily adjustable toward and away from the base, but in any position of adjustment the two passages being retained in perfect alignment.

These together with other objects and advantages which will become subsequently apparent reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming a part hereof, wherein like numerals refer to like parts throughout, and in which:

Figure 1 is a side elevational View of an accessory which is constructed in accordance .With the principles of the invention, this accessory being shown in use on a work piece and with a fragmentary'part of a drill that is fitted with a drill bit;

Figure 2 is an end view of the accessory of Figure 1, this view being in elevation;

Figure 3 is a top plan view of the structure in Figure 2;

Figure 4 is an enlarged sectional view taken on the line 44 of Figure 1;

Figure 5 is an enlarged sectional view taken approximately on the line 55 of Figure 1;

Figure 6 is a sectional view taken on the line 6-6 of Figure 1;

Figure 7 is a perspective view of another accessory which has been constructed in accordance with the principles of the invention;

Figure 8 is a sectional view taken on the line 8--8 of Figure 7; and

Figure 9 is a sectional view taken on the line 9-9'of Figure 7.

The accessory 10 of Figures 1-6 is used as an accessory, as opposed to the attachment which will be secured mechanically to the hand drill 12. The accessory is'a device that would be rested on the surface of a work piece, for example typical work piece 14, after a mark is made with a punch, or a pilot hole drill or the Work piece marked in some way to indicate the location of adesired hole. The drill 12 is of ordinary form and includes a chuck 18 together with a drill bit 20 carried by the chuck.

The accessory has a base 22 with a fiat bottom surface which is wider at one end than the opposite end. Boss 24 rises from the surface of base 22 and has a' pair of guide rods 26 and 28 which protrude upwardly therefrom. These guide rods are secured to the base and are parallel and spaced from each other, They are in a plane with a passage 30 formed at the narrow end of the base 22 and through which the drill bit 20 is adapted to be passed (Figure l). Passage 30' is formed by drilling. then counterboring to provide a bore 32' and a counterbore 34- separated by a sloped shoulder 36-, the counter bore being nearer to the top surface of the base 22- and in a boss 38 which rises from said top surface of the base. The reason for this construction is to facilitate the visual placing of the accessory over'the mark on the work where the hole is to be drilled and to facilitate insertion of the drill. through the base guidehole. Thebottom surface of. the base is an accurate work piece con-' tacting surface and is perpendicular to guide rods 26 and 28 and to the common center line or axis of passage 30" and passage 40 that is formed in guide 42.

The guide 42 comprises an arm 44 that has 'a'sl'ot opening through one end thereof. Pairs of confronting channels 47, 48 and 49, 50 are formed in the amt 44- of guide 42 and through slot 46. Guide rods 26 and 28 pass through these pairs of' confronting channels in order to form ways for the movement of guide 42 with respect to' base 22. There are means for holding the guide 42 in a fixed position on the pair of guide rods 26 and 28. It is preferred that these means be of simple construction-'- for quick and convenient locking action. The belt with a thumb nut 58, or fillister or other type head in a; half threaded hole 56 in guide 42 and washer 60 are: operatively associated such that upon rotation of the; thumb nut 58 the part of the guide on opposite sides of slot 46 will tightly clamp the channels against the rods- 26 and 28.

In using the accessory 10- work piece 14'is marked in order to locate the hole. Should it be desired that this hole he perpendicular to the surface of the workpiece 1 4 and there be no requirement for the depth of the hole, guide 42 neednot be adjusted toany specific station; on. guide rods 26 and 28. However, if the depth of penetration of the drill bit 14 is of consequence, the drill is arranged with its bit 20 passed through the aligned passages in the guide and base. The distance that the bit passes through the bottom surface 62 of base 22 will be the same as the depth of penetration of the drill bit into the work piece. The guide 42 is adjusted accordingly to touch the drill chuck.

Then, the accessory is placed on the work piece 14 and by sighting through both of the passages in a manner similar to the use of a rifle peep sight, the drill 12 is moved in such a direction that the drill bit passes through the aligned passages 30 and 40 and into the work piece. When the chuck 18 lightly touches the top surface of the guide 42 surrounding the passage 40, this signals that the proper depth of penetration of the drill bit 20 has been obtained. Accordingly, the upper surface of the guide around the passage 40 constitutes means for limiting iece.

p Attention is now invited to Figures 7-9 which demonstrate that the principles of the invention may be practiced in other structural embodiments. Here there is a base 70 which has a bottom work piece contactingsurface 71. Near one end of the base 70 there is a passage 72 whichis formed of a bore 73 and counterbore 74 separated by asloping wall 75. Passage 72 is similar in both function and construction to the passage 30, while passage 78 in guide 79 is similar in construction and function to the passage 40 in guide 42. The guide 79 is made of a block or panel whose opposite ends are disposed between the outer ends of a pair of levers 80 and 81 respectively. Pivot pins, as screws 82 and 83 pass through openings in the outer ends of levers 80 and 81 and are threaded into tapped holes in the opposite ends of guide 79. This mounts the guide for pivotal movement about an axis which is in plane parallel to but spaced from the plane of surface 71.

a The means for mounting the guide 79 in such position that it is always parallel to the surface 71 as seen best in Figure 7 and include the previously mentioned levers 80 and 81. The lower ends thereof are constrained to a path of travel that is parallel to surface 71. This is achieved by using a pin 85 which is secured to the lower ends of levers 80 and 81 and which is located in a slot 88 which is in base 70. A pair of links 90 and 91 are pivoted at their lower ends by pivot pins and spacers 92 and 93 to the sides of base 70, the pivot pins establishing a pivot axis which passes through the common center line of the passages 79 and 72. The upper ends of links 90 and 91 are apertured as are the medial points of levers 80 and 81. Bolt 95 is passed through pairs of these apertures and a thumb nut 96 is on the bolt. Spacer 97 is located between the levers 80 and 81 and has bolt 95 passed through the center of it. In this way when the thumb nut is loosened the levers may be adjusted, but when the thumb nut 96 is tightened, the levers become fixed in place.

In use of this accessory it is placed on the work piece just as the accessory 10, and under the same circumstances. In order to alter the position of the guide 79 loosening the thumb screw 96 and manually pushing the levers up or down is all that is necessary. Thereafter the thumb nut is tightened due to the fact that the links 90 and 91 are of the same length as one-half of either of the levers and they are connected to the mid-points of the levers, any motion of the levers as constrained by slot 88 and pin 85 will require guide 79 to remain always in a plane parallel to the surface 71 and with the center line of passage 78 coincident with the center line of passage 72.

The foregoing is considered as illustrative only of the principles of the invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation shown and described,

. 2,890,607 r e r andaccordingly all suitable modifications and equivalents may be resorted to, falling within the scope of the invention as claimed.

What is claimed as new is as follows:

1. An accessory for drilling comprising a base having an accurate lower surface adapted to be located on a work piece, said base having a drill bit passage extending therethrough near one end thereof, an upper guide provided with an upper drill bit passage, means carried by said base for releasably clamping said upper guide at varying distances from said base but with said passages on the same centerline which is normal to said base lower surface so that the depth of penetration of said drill bit into a workpiece may be controlled, said means comprising a pair of rods that are fixed to said base and that are in parallel spaced relation, said guide having a slot at one end through the walls of which there are pairs of confronting channels, said rods being passed through said pairs of channels to thereby mount said guide on said rods, and means connected with said guide to draw said slot and channels together and thereby clamp on said rods.

2. The accessory of claim 1 and a surface of said guide surrounding said passage in the guide forming a stop to limit the penetration of the drill bit into the work piece by having a part of the chuck holding the bit come into light contact with the last-mentioned surface.

3. An accessory for drilling comprising a base having an accurate lower surface adapted to be located on a work piece, said base having a drill bit passage extending therethrough near one end thereof, an upper guide provided with an upper drill bit passage, means carried by said base for holding said upper guide spaced from said base in selected positions but with said passages on the same centerline which is normal to said base lower surface, said means comprising a pair of levers, said guide being mounted for pivotal movement between the outer ends thereof and for movement about an axis which is in a plane parallel to said lower surface of said base, means constraining the movement of the opposite ends of said levers to a plane parallel to said surface, a pair of links pivoted at their lower ends to said base, and means pivotally connecting the upper ends of said links to the medial parts of said levers.

4. The accessory of claim 3 wherein said connecting means includes a fastener so that said links and levers may be selectively adjusted and locked to locate said guide in a selected position with respect to said base thereby providing a stop for the drill in order to preselect the extent of drill bit penetration in the work piece.

' References Cited in the file of this patent UNITED STATES PATENTS 458,581 Johnson Sept. 1, 1891 2,360,942 Ellerstein Oct. 24, 1944 2,622,458 Jenkins Dec. 23, 1952

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