US3635571A

US3635571A - Boring jig

Info

Publication number: US3635571A
Application number: US5676A
Authority: US
Inventors: Horace R Roberts; Anthony F Brizzi
Original assignee: Tool Research & Engineering Co
Current assignee: JP INDUSTRIES Inc A MI CORP; WESLOCK Corp A CORP OF; Tool Research & Engineering Co; Tool Research & Engineering Corp
Priority date: 1970-01-26
Filing date: 1970-01-26
Publication date: 1972-01-18
Anticipated expiration: 1989-01-18

Abstract

A boring jig for accurately providing two intersecting holes. A typical application of the jig is for boring holes in the face surfaces and one edge of a door to receive a conventional lock set. The boring jig is in the form of a clamping device and has easily adjustable, positive locking means for accurately determining the position of one of the holes with respect to an edge of the piece being bored.

Description

United States Patent Roberts et al. 1 1 Milo M Wm [54] BORING JIG [56] References Cited [72] Inventors: Horace R. Roberts, Huntington Beach; UNITED STATES PATENTS 32:? Santa 3,293,954 12/1966 Russell et al ..408/97 [73] Assignee: Tool Research 8: Engineering Corporation, Primary Examiner-Francis S. Husar Beverly Hills, Calif. Attorney-Spensley & Horn [22] Filed: Jan. 26, 1970 [57] AESTMQT [2U Appl' 5676 A boring jig for accurately providing two intersecting holes. A

typical application of the jig is for boring holes in the face sur- 52 us. c1 ..408 97, 408/108, 408/1 14 faces and one edge of a door to receive a conventional loclc [51] Int. Cl 13231; 47/23, 327 23/00 set. The boring jig is in the form of a clamping device and has [58] Field of Search ..408/97, 108, 109, 1 14 easily adjustable, positive k g m n f r acc r tely determining the position of one of the holes with respect to an edge of the piece being bored.

15 Clnilms, 7 Drawing Figures BORING .IIG

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates generally to a unique boring jig tool and more particularly to a boring jig tool which provides accurately openings positioned on three surfaces of a door to allow for the simple installation of a conventional door lock assembly.

2. Description of the Prior Art The standard technique for installing a modern conventional door lock (e.g., cylinder type lock) requires a first hole bored in one side edge of the door and a second, generally larger, hole bored through the two face surfaces of the door. The first hole typically allows the movable lock portion to extend beyond the edge to engage a mating latch on a door jamb. The second hole typically allows the body of the lock and a shaft with knobs thereon, to be housed in the door. Rotating the knobs allows for operation of the locking mechanism. The axes of the two holes, previously mentioned, should for best results normally intersect at right angles. To avoid installation problems and to assure proper lock operation the backset" (the distance between the side edge [nearest the lock] and the center of the hole bored through the face surfaces of the door) must be accurately determined. Often the location and backset positions vary from one door to another door because of the nature and/or style of the particular lock utilized. It is desirable that the holes formed in the door for receiving a lock set should have relatively precise dimensions and be free from ragged edges and/or splinters.

To accomplish the desired objectives, described above, the following approaches have been tried:

1. Manual measurement of backset and other hole locations by a workman followed by drilling with standard tools for each door;

2. Use of different boring jigs for different backsets; and

3. Use of jigs which require visual alignment and/or markings (e.g., scribing lines on a door) for determining the appropriate positions for the lock receiving openings.

Each of the known previous techniques has major drawbacks and disadvantages. For example, manual measuring and drilling each individual door is time consuming and subject to human error. It is also extremely difficult to keep the position and angle of the drills in alignment even if the exact hole positions are properly determined. Using completely different jigs for different backsets requires a number of tools, is expensive and makes it difficult to conveniently transport the jigs. Devices which require visual position alignment and/or require marking the door through spaced slots or the like to determine the position are again highly subject to human error. Some of the prior art boring jigs merely determined backset position but provided no means for determining the position for the other hole generally requiredin the side edge of the door.

The present invention overcomes to a great extent the possibility of human error and provides a simple and effective means for conveniently providing the required holes in precise alignment. Only the vertical position and desired backset distance must be selected by the workman.

SUMMARY OF THE INVENTION The present invention involves a boring jig device which when applied to lock installation on a door allows precise alignment of the two required hole axes and accurate location of the backset for a plurality of possible backset positions. The adjustment means for obtaining the various backset positions do not rely solely on the visual alignment of the workman, but operate by the positive engagement of an adjustable blade stop member and the selection of a proper bushing location for a suitable boring tool. As will become apparent from the detailed description of the preferred embodiment, the simplicity of operation as well as the novel structural features and their organization make the invented boring jig the type of tool which can be easily used by both the skilled or unskilled workman without much risk of human error.

Basically, the invented boring jig is comprised of three major assemblies which form a clamping device. These major assemblies are a first side plate adapted to provide a plurality of bushing housings; a second side plate adapted to contain guide apertures for the face surface holes; and, a central block assembly which houses an adjusting means to clamp the jig on the door at the desired vertical position on the door and an adjustable means with positive engagement means for accurately determining the proper backset position. The central block also contains appropriate guide pins and other means for connecting two side plates assemblies to form an adjustable clamping device. The central block also provides a bushing portion and self-adjusting means for providing a hole in the edge of the door, if required.

The unique overall structure as well as the novel combination of elements of the invented boring jig provide a simple boring jig which can be easily operated to provide proper openings to receive a conventional door lock. It should be understood that while the present invention will be described with the emphasis on providing two intersecting holes in a door, the invented jig can be used for providing either the edge hole or face surface holes alone. Also, the invented boring jig can be used in any application, other than on doors, where the same problems are encountered in accurately positioning two holes on axis intersecting each other at substantially right angles. The use of appropriate boring bits (generally connected to a power operated tool) in conjunction with the construction of the invented boring jig allows holes of accurate dimensions to be formed without producing ragged edges or splintering.

The invention will be better understood when considered in the light of the description of the preferred embodiment and the drawings which follow hereinafter.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. I is a view showing one embodiment of the invented boring jig clamped to a door;

FIG. 2 is a cross-sectional view of the invented boring jig taken along line 2-2 in FIG. 1;

FIG. 3 is a sectional view taken along line 3-3 in FIG. 2 showing only a fragmentary portion of the door;

FIG. 4 is an end view taken in the direction of the line 4-4, in FIG. 3;

FIG. 5 is a sectional view taken along the line 5-5 in FIG.

FIG. 6 is a sectional view taken along line 6-6 in FIG. 3 showing in detail the positive engaging adjustment mechanism for determining backset; and

FIG. 7 is a sectional view taken along line 7-7 of FIG. 3.

DESCRIPTION OF PREFERRED EMBODIMENT A preferred embodiment of the invented boring jig i0 is comprised of three major portions. These portions are the bushing side plate 12, the guide opening side plate 114 and the central block assembly 16. With reference to FIGS. 2 and 3 in particular, it may be observed that the bushing side plate 12 has supporting strips 18a and 18b to provide suitable mounting surfaces for the bushing sleeves 20a and 20b.

Bushings

22a and 22b are disposed in sleeves 20a and 20b, respectively. The bushing side plate 12 contains

openings

24, 26, 28 and 30. Opening 24 is threaded (e.g., right-hand thread) to receive one end 74a, a spindle adjusting screw 74. (see FIGS. 2 and 7) Openings 26 and 28 are not threaded and provide guide surfaces for

engaging guide pins

66 and 68, respectively. (See FIGS. 2, 4 and 5) Opening 30 is threaded to accept a positioning pin 82. (See FIGS. 2 and 4) The guide openings side plate 14 contain

guide apertures

32a and 32b formed by

rims

33a and 33b protruding from the side plate 14 as shown in FIGS. 1 and 2. Further, the side plate 14 contains

openings

34, 36 and 38. Opening 34 is threaded in j an opposite direction (e.g., left-handed thread) from opening 24 to receive the other end 74b of spindle adjusting screw 74. Openings 36 and 38 are not threaded and provide guiding surfaces for engaging guide pins 66 and 68, as shown in FIG. 5, in a similar manner to openings 26 and 28 in side plate 12.

The central block assembly 16 contains three

main portions

40, 42 and 44 as shown in FIG. 3. Portions 40 and 42 contain

slots

46 and 48, respectively for receiving adjustable blade stops 54 and 56, respectively. Further, portions 40 and 42 contain

additional slots

50 and 52, shown in FIG. 5, which are adapted to receive stop locks 55 and 57, respectively. The

slots

46 and 48 intersect

slots

50 and 52 at substantially right angles. The

slots

50 and 52 are in communication with circular cavity portions 50a and 52a which are threaded at 50b and 52b, respectively. The circular portions 50b and 52b house compression springs 88 and 90, respectively. The springs are retained within the circular cavities 50a and 52a, respectively, by threaded caps 50c and 520, respectively, which are in engagement with threaded portions 50b and 52b, respectively. The adjustable blade stops 54 and 56 each contain a pair of notches 54a and 54b and 560 respectively, 56b, respectively. (See FIGS. 3 and 6) The stop locks 55 and 57 contain elongated openings 55a and 57a and

tab portions

55b and 57b. When assembled in operative engagement, the

tabs

55b and 57b may be depressed to allow movement of the adjustable blade stops 54 and 56. The inner openings 55a and 57a of the stop locks 55 and 57, respectively, serve as positive locking means which engage the notches in the adjustable blade stops 54 and 56. Thus, by virtue of the spring action on the stop lock, once depression of the

tabs

55b and 57b is released, the notches in the adjustable blade stops 54 and 56 will engage the surfaces 550 and 57c of openings 55a and 57a of the stop lock, thus securing the adjustable blade stop in certain fixed positions. (See FIGS. and 6) The adjustable blade stops 54 and 56 thus allow for the accurate determination of backset distances as will be described in detail hereinafter.

The third portion 44 of the central block assembly 16 comprises an opening 59, a bushing sleeve 58 and an insert bushing 60. The opening 59 and bushing 60 is adapted to receive a suitable boring bit 94.

The portions 40 and 42 contain openings 62 and 64 which receive guide pins 66 and 68, respectively. The guide pins 66 and 68 may be retained in the opening 62 and 64 by interference means accomplished by the proper sizing of the openings 62 and 64 with respect to the guide pins 66 and 68. The guide pins 66 and 68 may also contain grooves 66a and 68a which will mate with suitably positioned staked portions 66b and 68b to fix and lock the guide pins in place. Other equivalent means for retaining the guide pins 66 and 68 in place may also be utilized such as by using set screws instead of staked portion 66b and 68b to engage the grooves 664 and 68a.

The portion 40 further contains an opening 70 for receiving the spindle adjusting screw 74. The spindle adjusting screw contains a right-hand threaded portion 74a and a lefthand threaded portion 74b. The threaded portions 740 and 74b are separated by an unthreaded shaft portion 740. The portion 74c is sized to tightly engage the opening 70 and to be centrally positioned by means of standard type

snap ring retainers

72a and 72b which are positioned on opposite sides of the opening 70 and maintained in place by suitable grooves in the screw 74.

The spindle adjusting screw is adapted at end 740 to receive a conventional turning handle 76 which may be retained by conventional means such as a lock washer 78 and holding nut 80.

When fully assembled the spindle adjusting screws 74 threads into oppositely threaded openings 24 and 34in the

side plates

12 and 14, respectively. Threaded portion 740 engages opening 24 and threaded portion 74b engages opening 34. Thus, when the turning handle 76 is rotated, the spindle adjusting screw 74 causes the

side plates

12 and 14 to move closer or further apart depending on the direction of rotation of the handle 76. The guide pin 66 passes through the

openings

26 and 36 in

side plates

12 and 14, respectively, and guide pin 66 passes through the openings 28 and 38 in

side plates

12 and 14, respectively. The guide pins 66 and 68 when engaged prevent the

side plates

12 and 14 from pivoting around the spindle adjusting screw 74 and thus keep the side plates in substantial alignment so that the

bushings

22a and 22b are precisely aligned with respect to the centerpoint of the

guide apertures

32a and 32b.

To further keep the side plates in precise alignment, the

side plates

12 and 14 are maintained at all times in parallel relationship by use of a positioning pin 82. (See FIGS. 2 and 4) The positioning pin 82 has a threaded portion 82a which engages the threaded opening 30 in side plate 12. After utilizing the spindle adjusting screw to clamp the boring jig 10 to a door or other suitable surface, the positioning pin may be adjusted so that the end 82b is in firm contact with the inner surface of side plate 14. The pin 82 thus helps maintain the parallel relationship between the

side plates

12 and 14. The positioning pin has a knurled head 84 to allow easy gripping for adjusting. Further, a threaded knurled washer 86 may be utilized on the threaded portion 82a so that the positioning pin 82 may be locked into place.

A multispur machine bit 92 having a cutting head 92a may then be inserted into either one of the

bushings

22a and 22b depending on the backset distance desired. The manner of adjusting the backset distance and operating the invented boring jig 10 will be described in detail below. A boring bit 94 having a cutting head 96 is inserted into bushing 60 when an edge hole is required. The

bits

92 and 94 are typically connected to chucks which are part of a power driven tool such as an electric drill. (See FIG. 1)

OPERATION OF INVENTED BORING JIG As previously discussed hereinabove, one of the major applications for the invented boring jig is to provide precisely positioned and aligned holes in a door for installing a conventional lock set. Typically, a door D, as shown in FIG. 2, will require an opening or hole 98 (e.g., 2% inches in diameter) which will extend through the entire thickness T of door D. The hole 98 terminates at the face surfaces 102 and 104 of the door D and the axis of hole 98 is normal to

surfaces

102 and 104. Typically, the door D will require an opening (e.g., fifteen-sixteenths inch in diameter) which extends from the edge of the door 106 and extends to the hole 98. The opening 100 is generally centrally located with respect to the dimension T and the axis of the hole 100 is usually required to be perpendicular to the axis of the hole 98.

The distance between the edge 106 of the door D and the centerline or axis of the hole 98is called backset. In the preferred embodiment of the boring jig 10 described above and shown in the drawings appended hereto, three backset positions, A, B and C may be accurately determined. The three backset distances which are presently commonly used are 2% inches, 2% inches and 5 inches. However, it should be clearly understood that other backset distances and/or additional backset positions can be provided utilizing the concepts of the invented boring jig without departing in anyway from the scope and teachings of the present invention. The backset distance, hole dimensions and the number of backset positions described herein are for purposes of illustration only.

To adjust the backset distance the

tabs

55b and 57b of the stop locks 55 and 57 respectively, are depressed to allow movement of the adjustable blade stops 54 and 56. (See FIG. 6) Each of the blade stops 54 and 56 have two notches 54a and 54b and 56a and 56b. By way of example, notches 54a and 56a will correspond with a backset position of 2% inches and notches 54b and 56b will correspond with backset distances of 2% inches and 5 inches. The blade stops 54 and 56 generally will have leading edges 108 and 110 which are angled approximately 5. The apicies 108a and 110a of the blade stops 54 and 56 are positioned in the jig 10 so that they are always at the midpoint between the

side plates

12 and 14. This is accomplished by positioning the

slots

46 and 48 which receive the blade stops 54 and 56 off center. (See FIG. 7) Normally, the edge 106 of the door D will be angled about 3. (See FIGS. 2 and 6) The angle on edges 108 and 110 insures that the blade stops will properly contact the edge 106 to give accurate backset distances even if the angle is slightly more than the standard 3 and even if the boring jig is placed on the door in such a way that the sloped edges 108 and 1 10 do not follow the direction of the slope of the door edge. When the boring jig 10 is placed on the door D in such a manner that the edges 108 and 110 do not exactly follow the slope of the door edge, the backset distances A, B and C will still be accurate since the calibration of the backset distances are based from the rounded apicies 108a and 11011 of the blade stops 54 and 56 and these points will always engage the central portion of edge 106 (See FIG. 6) irrespective of the direction and slope of the door edge. The rounded apicies 108a and 110a prevent marring the door edge 106.

The adjustable backset means operate as follows. (See FIG. 5 and 6 for examples) The springs 88 and 90 are normally in compression and thus force or bias the stop locks 55 and 57 in a direction away from the springs. The stop locks 55 and 57 contain openings 55a and 57a which are sized so that the blade stops 54 and 56 may smoothly slide through the openings when the stop lock tabs 55a and 57a are depressed but will securely lock the blade stops at 55c and 57c with a ratchet type action in notches 54a (or 54b) and 56a (or 56b) when the blade stops are in proper position and the tabs 55a and 57a are released. The springs 88 and 90 supply the necessary locking force when the blade stops 54 and 56 are properly positioned.

The

apertures

32a and 32b formed by the

rims

33a and 33b, respectively, serve as guides for forming hole 98. Aperture 32a is positioned in side plate 14 so that when blade stops 54 and 56 are positioned whereby stop locks 55 and 57 are engaged with notches 54a and 56a, the backset distance B" is 2% inches, for example. When notches 54b and 56b are engaged the backset distance A, using aperture 32a as a guide, is 2% inches, for example. Thus, the distance between the notches in this preferred example is inch. (See FIGS. 2 and The aperture 32b is positioned in side plate 14 so that when blade stops 54 and 56 are positioned whereby stop locks 55 and 57 engage notches 54b and 56b, the backset distance C is 5 inches, for example. Thus, the distance between the centerlines of

apertures

32a and 32b in this preferred embodiment is 2% inches.

The centerlines of the

bushings

22a and 22b coincide with the centerlines of

apertures

32a and 32b, respectively, when the boring jig is assembled. The supporting strips 18:: and 18b and sleeves 20a and 20b which serve to house the

bushing

22a and 22b are sufficiently recessed from the side plate 12 so that when a multispur bit 92 is inserted in one of the bearings the head of the bit 92a will be behind the surface 12b of the side plate 12. (See FIG. 2) This allows the boring jig 10 to be attached to a door with the bit 92 in position and without scarring or marring the door surface 102. The following table will aid in determining the proper bushings, apertures and blade stop notch settings for the various backsets shown in FIG. 2.

Guide Blade Stop The invented boring jig 10 thus allows the selection of an accurate backset distance and because of the adjustable locking feature, described above, assures that such backset distance will be maintained when the edge 106 of the door D is in contact with the edge 106 and 111 of the blade stops 54 and 56, respectively.

The central block assembly 16, as previously described, contains an opening 59 and bushing 66 which receives a boring bit 94. The boring bit 94 will provide a properly aligned and precisely positioned hole from the edge 106 to the opening 96. The boring bit 94 usually contains a suitable cutting head 96 as shown in FIG. 2.

The configuration of the central block assembly 16 is such that the cutting head 94 may be disposed in a recess between the portions 40 and 42, when desired, to allow the boring bit 92 to be in position ready for use without marring the door edge 106 and without interfering with the positioning of the jig 10 on the door D.

The

boring bits

92 and 94 may be connected to suitable conventional type tools. Typically, an electrically operated drill with a standard chuck for engaging the

bits

92 and 94 will provide the required power for boring the required holes.

To use the boring jig 10, the boring bit 92 is inserted into the

proper bushing

22a or 22b, depending on the backset required, and the boring bit 94 is positioned in bushing 66. The heads of both bits are positioned close to the respective surfaces of the bushings to avoid interference with the door surfaces. The adjustable blade stops 54 and 56 are then posi' tioned with the proper notches engaging; the stop locks 55 and 57, respectively.

The handle 76 is then rotated counterclockwise thereby causing the spindle adjusting screw 74 to turn so that the

side plates

12 and 14 are sufficiently spaced (greater than dimension T) to allow the jig to be disposed on the door D at the proper vertical location. (See FIG. 1) The edge 106 of the door D should properly engage and contact the blade stops 54 and 56 as shown in FIGS. 2 and 6. The spindle adjusting screw 74 which has two oppositely threaded portions 74a and 74b engage the mating threads in

openings

24 and 34 of

side plates

12 and 14, respectively. This configuration allows both of the

plates

12 and 14 to move together or apart in concert while constantly maintaining the center axis of bushing 60 at exactly the midpoint of the distance between the

side plates

12 and 14. The unthreaded central portion 740 is maintained in its proper position in the block portion 44 by means of the

snap ring retainers

72a and 72b. The guide pins 66 and 68 serve to keep the

side plates

12 and 14 from pivoting around the spindle adjusting screw 74. Guide pin 66 is engaged in unthreaded

openings

26 and 36 in

plates

12 and 14, respectively. Guide pin 68 is engaged in unthreaded openings 28 and 321 in

plates

12 and 14, respectively. The

openings

26, 28, 36 and 38 are sized large enough to allow relatively easy movement of the guide pins 66 and 66 but small enough to avoid any unnecessary looseness which would cause misalignment between the plates.

After the boring jig 19 has been positioned in the desired location, as described above, the handle 76 is rotated clockwise causing the screw 74 to tighten the

side plates

12 and 14 against the surfaces 102 and 194, thus causing the jig to be firmly affixed to the door D at the desired location. If desired, a positioning pin 82 may be used to further insure that the

plates

12 and 14 will remain in parallel relationship. The pin 82 has a threaded portion 82a which engages the threaded hole 30 in side plate 12. After the boring jig 16 has been fixed in place the knurled head 84 of the pin 62 may be rotated until the end of the pin 82b is in tight contact with surface 14a of the side plate 14 at point X. A threaded knurled washer 116 which has been threaded onto portion 32b of pin 62 may then be utilized to tightly lock the pin in place, as shown in FIGS. 2 and 4. The washer 86 is positioned until one of its surfaces makes contact with side plate 12 insuring that the pin 62 remains tightly engaged against side plate 14 and thus keeping the side plates in parallel relationship while the boring bits form the required holes.

A conventional power tool (not shown) may be connected to the multispur bit 92 causing the hole 98 to be formed with the exact'backset distance selected. The power tool may then be connected to boring bit 94 (a typical connecting chuck is shown in FIGS. 1 and 2) allowing hole 100 to be formed so that it is precisely centered on edge 106 and so that the axis of hole 100 is perpendicular to the axis of hole 98. Also, the configuration of the invented boring jig allows hole 100 to communicate with hole 98 at precisely the desired place to allow easy installation of a conventional lock set assembly. As previously described the invented structure permits the central block assembly to adjust itself to the midpoint between

side plates

12 and 14.

The use of a multispur bit 92, as shown in FIG. 2, in conjunction with the properly

sized guide apertures

32a and 32b (slightly larger than the diameter of head 92a) results in a hole 98 having even edges without any splintering on the

surfaces

102 and 104. Also, a cutting head 96, with the configuration shown in FIG. 2, allows for a hole 100 that has no inner ragged edges and no splintering problems at edge 106.

While certain dimensions, applications and configurations have been specifically described herein, it will be obvious to those skilled in the art that various changes may be made to the invented boring jig without departing from the concepts and teachings of the present invention.

We claim:

1. A boring jig comprising:

a. a first side plate having at least one first bushing means for supporting a first boring bit;

b. a second side plate having at least one guide aperture therein, said aperture being sized to substantially correspond to the diameter of a first hole to be formed in a workpiece;

c. a housing disposed substantially centrally between said first and second side plates;

d. means coupled to said housing for engaging said first and second side plates, said engaging means comprising means for maintaining said first and second side plates in parallel relationship and for aligning said side plates whereby the centerline axis of said. bearing and guide aperture are substantially coincident; and said engaging means containing means for varying the distance between said side plates thereby allowing said jig to be clamped to the workpiece; and adjustable means for accurately determining the distance of said first hole with respect to one edge of said workpiece to be bored, said adjustable means including blade means having a plurality of notches therein and stop lock means for engaging said notches to provide discrete distance settings, whereby said adjustable means may be locked into position to allow accurate distance settings when said blade means are in contact with said workpiece edge.

2. The boring jig of claim 1 in which said adjustable means further comprise spring means for biasing said stop lock means to positively lock said adjustable means in position.

3. The boring jig of claim 2 in which said stop lock means have tab means allowing said stop lock means to be depressed, whereby the bias caused by said spring means may be overriden allowing said blade means to be moved to a different notch for engaging said stop lock means.

4. The boring jig of claim 1 in which said housing contains a second bushing means located substantially centrally in said housing whereby a second boring bit for providing a second hole in the workpiece may be supported therein, said second bushing means having an axis substantially normal to said centerline axis of said first bushing means.

5. The boring jig of claim 4 in which said means for varying the distance between said side plates contain means for maintaining said housing and said centerline axis of said second bushing at the midpoint between said side plates irrespective of the position of said side plates.

6. A boring jig comprising: A

d. means coupled to said housing for engaging said first and second side plates, said engaging means comprising means for maintaining said first and second side plates in parallel relationship and for aligning said side plates whereby the centerline axis of said bearing and guide aperture are substantially coincident; and said engaging means containing means for varying the distance between said side plates thereby allowing said jig to be clamped to the workpiece; v

. adjustable means for accurately determining the distance of said first hole with respect to one edge of said workpiece to be bored, said adjustable means including blade means having a plurality of notches therein and stop lock means for engaging said notches to provide discrete distance settings, whereby said adjustable means may be locked into position to allow accurate distance settings when said blade means are in contact with said workpiece edge; and

f. a second bushing means for supporting a second boring bit coupled to said housing and disposed substantially centrally in said housing, said second bushing means having an axis substantially normal to said centerline axis of said first bushing means.

7. The boring jig of claim 6 in which said means for varying the distance between said side plates contain means for maintaining said housing and said centerline axis of said second bushing at the midpoint between said side plates irrespective of the position of said side plates.

8. The boring jig of claim 6 in which said adjustable means further comprise spring means for biasing said stop lock means to positively lock said adjustable means in position.

9. The boring jig of claim 8 in which said stop lock means have tab means allowing said stop lock means to be depressed, whereby the bias caused by said spring means may be overriden allowing said blade means to be moved to a different notch for engaging said stop lock means.

10. A boring jig for providing two intersecting holes with perpendicular axes in a door for receiving a lock set compris ing:

b. a second side plate having at least one guide aperture therein, said aperture being sized to substantially correspond to the diameter of a first hole to be formed in the face surfaces of the door;

. a housing disposed substantially centrally between said first and second side plates;

d. means coupled to said housing for engaging said first and second side plates, said engaging means comprising means for maintaining said first and second side plates in parallel relationship and for aligning said side plates whereby the centerline axis of said bearing and guide aperture are substantially coincident; and said engaging means containing means for varying the distance between said side plates thereby allowing said jig to be clamped onto the door at one edge thereof;

e. adjustable means for accurately determining the distance of said first hole with respect to one edge of said workpiece to be bored, said adjustable means including blade means having a plurality of notches therein and stop lock means for engaging said notches to provide discrete distance settings, whereby said adjustable means may be locked into position to allow accurate distance settings when said blade means are in contact with said workpiece edge; and

f. a second bushing means for supporting a second boring bit coupled to said housing and disposed substantially centrally in said housing, said second bushing means having an axis substantially normal to said centerline axis of said first bushing means, said second boring bit capable of forming a second hole in the edge of said door, said second hole having an axis which is perpendicular to said first hole.

11. The boring jig of claim 10in which said means for varying the distance between said side plates contain means for maintaining said housing and said centerline axis of said second bushing at the midpoint between said side plates irrespective of the position of said side plates.

12. The boring jig of claim 1 in which said first side plate has two spaced bushing means and said second side plate has two spaced guide apertures each of said bushing means having an axis coincident with a corresponding guide aperture.

13. The boring jig of claim 10 in which said adjustable means further comprise spring means for biasing said stop lock means to positively lock said adjustable means in position.

14. The boring jig of claim 13 in which said stop lock means have tab means allowing said stop lock means to be depressed, whereby the bias caused by said spring means may be overriden allowing said blade means to be moved to a different notch for engaging said stop lock means.

15. The boring jig of claim 10 in which said blade means have leading edges angled about 5 to contact angled door edges and said leading edges have apicies located to engage the central portion of said door edges to provide accurate backset positions irrespective of the door edges slope and direction.

Claims

1. A boring jig comprising: a. a first side plate having at least one first bushing means for supporting a first boring bit; b. a second side plate having at least one guide aperture therein, said aperture being sized to substantially correspond to the diameter of a first hole to be formed in a workpiece; c. a housing disposed substantially centrally between said first and second side plates; d. means coupled to said housing for engaging said first and second side plates, said engaging means comprising means for maintaining said first and second side plates in parallel relationship and for aligning said side plates whereby the centerline axis of said bearing and guide aperture are substantially coincident; and said engaging means containing means for varying the distance between said side plates thereby allowing said jig to be clamped to the workpiece; and e. adjustable means for accurately determining the distance of said first hole with respect to one edge of said workpiece to be bored, said adjustable means including blade means having a plurality of notches therein and stop lock means for engaging said notches to provide discrete distance settings, whereby said adjustable means may be locked into position to allow accurate distance settings when said blade means are in contact with said workpiece edge.

6. A boring jig comprising: a. a first side plate having at least one first bushing means for supporting a first boring bit; b. a second side plate having at least one guide aperture therein, said aperture being sized to substantially correspond to the diameter of a first hole to be formed in a workpiece; c. a housing disposed substantially centrally between said first and second side plates; d. means coupled to said housing for engaging said first and second side plates, said engaging means comprising means for maintaining said first and second side plates in parallel relationship and for aligning said side plates whereby the centerline axis of said bearing and guide aperture are substantially coincident; and said engaging means containing means for varying the distance between said side plates thereby allowing said jig to be clamped to the workpiece; e. adjustable means for accurately determining the distance of said first hole with respect to one edge of said workpiece to be bored, said adjustable means including blade means having a plurality of notches therein and stop lock means for engaging said notches to provide discrete distance settings, whereby said adjustable means may be locked into position to allow accurate distance settings when said blade means are in contact with said workpiece edge; and f. a second bushing means for supporting a second boring bit coupled to said housing and disposed substantially centrally in said housing, said second bushing means having an axis substantIally normal to said centerline axis of said first bushing means.

10. A boring jig for providing two intersecting holes with perpendicular axes in a door for receiving a lock set comprising: a. a first side plate having at least one first bushing means for supporting a first boring bit; b. a second side plate having at least one guide aperture therein, said aperture being sized to substantially correspond to the diameter of a first hole to be formed in the face surfaces of the door; c. a housing disposed substantially centrally between said first and second side plates; d. means coupled to said housing for engaging said first and second side plates, said engaging means comprising means for maintaining said first and second side plates in parallel relationship and for aligning said side plates whereby the centerline axis of said bearing and guide aperture are substantially coincident; and said engaging means containing means for varying the distance between said side plates thereby allowing said jig to be clamped onto the door at one edge thereof; e. adjustable means for accurately determining the distance of said first hole with respect to one edge of said workpiece to be bored, said adjustable means including blade means having a plurality of notches therein and stop lock means for engaging said notches to provide discrete distance settings, whereby said adjustable means may be locked into position to allow accurate distance settings when said blade means are in contact with said workpiece edge; and f. a second bushing means for supporting a second boring bit coupled to said housing and disposed substantially centrally in said housing, said second bushing means having an axis substantially normal to said centerline axis of said first bushing means, said second boring bit capable of forming a second hole in the edge of said door, said second hole having an axis which is perpendicular to said first hole.

11. The boring jig of claim 10 in which said means for varying the distance between said side plates contain means for maintaining said housing and said centerline axis of said second bushing at the midpoint between said side plates irrespective of the position of said side plates.

15. The boring jig of claim 10 in which said blade means have leading edges angled about 5* to contact angled door edges and said leading edges have apicies located to engage the central portion of said door edges to provide accurate backset positions irrespective of the door edges slope and direction.