US 3788759 A
A boring device for locating and drilling hinge mounting holes in frame and door members includes a base member with a stop shoulder for positioning the device with respect to the edge of the frame member. A slide member positionally adjustable within a channel in the base member is secured to the base member. The slide member includes at least one bore jig for properly aligning a bit during drilling of one or more mounting holes. Transverse interfitting grooves between the mating surfaces of the base and slide members in conjunction with a screw and slot arrangement in the slide member provide a rigid yet adjustable mounting arrangement between the two elements. Graduated indicia on the base member and a positioning index on the slide member permit the two members to be adjusted with respect to each other for accurate positioning of the bore jig and repositioning of the members.
Description (OCR text may contain errors)
United States Patent [191 Griinert [451 Jan. 29, 1974 Hellmuth Griinert, Hoffnungsthal Bezirk, Cologne, Germany  Inventor:
 Assignee: Prameta Prazisionsmetall und Kunstslofferzeugnisse G. Baumann & Co., Cologne, Germany 22 Filed: May 12, 1972 211 App1.No.: 252,689
 Foreign Application Priority Data May 18, 1971 Germany 7119368  US. Cl 408/115, 33/189, 33/187  Int. Cl B23b 47/28  Field of Search 408/115, 72, 241, 109, 97; 33/189, 197; 144/27 6/1917 Holmgren 408/97 310,710 l/l885 Nichols 408/97 Primary Examiner-Gil Weidenfeld Attorney, Agent, or FirmMarkva and Smith [5 7] ABSTRACT A boring device for locating and drilling hinge mounting holes in frame and door members includes a base member with a stop shoulder for positioning the device with respect to the edge of the frame member. A slide member positionally adjustable within a channel in the base member is secured to the base member. The slide member includes at least one bore jig for properly aligning a bit during drilling of one or more mounting holes. Transverse interfitting grooves between the mating surfaces of the base and slide members in conjunction with a screw and slot arrangement in the slide member provide a rigid yet adjustable mounting arrangement between the two elements. Graduated indicia on the base member and a positioning index on the slide member permit the two members to be adjusted with respect to each other for accurate positioning of the bore jig and repositioning of the members.
5 Claims, 4 Drawing Figures PATENTEI] JAN 2 91574 FIG] FIGA
BORING DEVICE TO FASTEN HINGE FRAMES OR THE LIKE BACKGROUND OF THE INVENTION like.
This device is primarily directed to those types of hinge elements used to orientably connect a door to a frame. The frame hinge portion is usually secured to the frame wall by means of a bolt, while the door hinge portion is engaged in a recess provided in the door surface.
Various arrangements are provided for the mounting of the frame hinge portions by means of different bolt fixtures depending upon whether the hinge is of the visible or covered type. With the visible type hinge the frame is provided with a large angle of aperture; while with the covered hinge the frame is provided with an angle of aperture exceeding 90. The frame hinge portion engages a flat element in the U-shaped door hinge element. A frame fixture bolt is provided to permit positioning of the frame hinge portion so that the door hinge element may be arranged at a greater or less length as necessary for proper alignment of the door and hinge. With respect to the visible hinge frame portion, the door element has a length which is less than that of the covered type hinge.
OBJECTS OF THE INVENTION It is an object of the present invention to provide a boring device for accurate placement of the fixture bolt for frame hinge mounting.
It is a further object of this invention to provide a boring device which may be used with frames having various thicknesses or hinge members of various sizes.
Another object of the present device is to provide a boring jig which is not only easy to operate but inexpensive to manufacture yet capable of producing accurate results.
SUMMARY OF THE INVENTION The boring device as described herein includes upper and lower guide elements or members which are adjustably positionable with respect to each other. The lower or base member includes a stop shoulder which is designed to fit against the edge of the frame member. A channel is provided in the upper surface of the base member. for slidably positioning the upper or slide member in a generally perpendicular arrangement with respect to the stop shoulder. A screw and slot arrangement allows the slide member to be slidably positioned in the channel permitting a bore jig or jack provided in the slide member to be positioned with respect to the edge of the frame.
Transversely extending mating grooves are provided in the contiguous surfaces between the base and slide members so that a rigid and secure joint is provided.
Graduated .indicia on the upper surface of the base member and an index mark on the slide member per mits the elements to be repositioned accurately when used with frame members having various thicknesses.
BRIEF DESCRIPTION OF DRAWINGS Other objects of this invention will appear in the following description and appended claims, reference being made to the accompanying drawings forming a part of the specification wherein like reference characters designate corresponding parts in the several views.
FIG. I shows a side elevation view of the assembled boring device'according to the present invention;
FIG. 2 is a top plan view of the assembled boring device according to FIG. 1;
FIG. 3 is a side view of the boring device of the present invention; and
FIG. 4 is a side view of the bottom element of the boring device having the upper element removed.
DESCRIPTION OF SPECIFIC EMBODIMENTS The boring device as shown in FIG. 1 includes a base or bore member 1 and an upper or slide member 2. The base member 1, as shown more clearly in FIGS. 2 and 4, is provided with a corbelled shoulder la which forms a rectangular abutment face 3. The abutment face 3 is provided to fit the outer edge of the frame member during the drilling of the fixture bolt hole.
The slide member 2 is guided for displaceable longitudinal movement in a groove slot 4 formed in the upper surface of the base member 1. An adjusting slot 5 is provided along the longitudinal axis of the upper element 2. A lead screw 6 passes through the slot 5 and is threaded into a hole 7 formed in the base or bore member 1. The slide member 2 includes a bore jacket or drilling jig 8. p
The bottom surface 9 of groove 4 and underside surface 10 of slide member 2 which form the mating surfaces between the two members are provided with transversely extending, interfitting grooves or serrations. In this fashion, base member 1 and slide member 2 can be positioned with respect to each other by means of a relatively rigid connection yet have the ca pability of being adjustably positioned with respect to each other. The lead screw 6 need only be tightened a nominal amount sufficient to prevent the grooves from sliding over each other. In this way even by finger tightening the lead screw 6, a secure and accurate gauge position can be obtained.
As shown in FIG. 1, graduated indicia 11 are provided on the upper surface of the base member 1 and are coordinated with an index mark 12 on the top of the slide member 2. By means of the indicia l1 and mark 12 the adjustment of the slide member 2 relative to the base member 1 may be'determined with accuracy. The members may be repositioned. again after being adjusted for use with frames of various thicknesses.
If desired, two holes 13 may be provided in the side portion of the base member 1 through which mounting screws may pass for attaching a gib for application to the longitudinal edge of a door member.
Also, if desired, the pitch between the transverse grooves on the surfaces 9 and 10 can be arranged to correspond to dimensional units so that movement of the slide member 2 can be made in increments of dimensional units and coordinated with the indicia 11.
While a boring. device has been shown and described in detail, it is obvious that this invention is not to be considered as being limited to the exact form disclosed and that changes in detail and construction may be made therein within the scope of the invention without departing from the spirit thereof.
1. A boring device for locating and guiding a drill during the boring of a hinge mounting hole in a frame member comprising a. a base member having stop means for engaging a surface of said frame member,
b. an elongated slide member slidably mounted on said base member,
c. said base member including a recessed groove for supporting said slide member,
d. said slide member including means for guiding said drill and an elongated slot, and
e. a lead screw passing through said slot into said base member to adjustably secure said members relative to each other,
f. whereby said guide means may be positioned at a desired location along a further surface of said frame member by movement of said slide member with respect to said base member in a direction along its longitudinal axis.
2. A boring device as defined in claim 1 wherein said stop means includes a surface for engaging said surface of said frame and said slide member is arranged with respect to said base member so that its longitudinal axis is disposed generally perpendicular to said surface of said stop means.
3. A boring device as defined in claim 1 wherein contiguous surfaces of both said groove in said base member and said slide member include interfitting grooves, said grooves being disposed transversely to the direction of movement of said slide member.
4. A boring device as defined in claim 1 wherein said base member includes graduated'indicia and said slide member includes an index mark disposed adjacent to said indicia whereby the relative position between said members may be determined.
5. A boring device as defined in claim 1 wherein said base member includes at least one bore whereby a jig may be attached for securing said device to a longitudinal edge of a corresponding door member.