US2785712A - Guide frame for a rotating mortising tool - Google Patents

Description

March 19, 1957 F. s. PERSON 2,785,712

GUIDE FRAME FOR A ROTA'I'ING MORTISING TOOL Filed Oct. 19, 1953 33 a 15,) ,Z4 16] 779 MF4 40 INVENTOR ra n/r .51h/person BY mjnggwomm i nited States Patent E linvention relates to an limprovement in guide frame -for a rotating mortising tool and -deals particularly with an apparatus for mortising 'hinge 'recesses which employs-a portable drill.

'Considerable di-iiiculty is 'experienced in -mortising hinges into doors and door frames. 1t is v-usual'practice j to cutinto the wood along a predetermined ont-line with i a chisel or other `such tooland then to Vcut out `ihewood Within the outline. This lrequires consiclerable skill,V pai-'- i ticularly in maintaining a proper depth th'rough'out'the` recess.' While devices have been provided for mortisng into` the wooden panel, such devices have been zextremely costly. Furthermore, vthe wood Ais mortised `throrrgh'the use of Va rotating bit which` rotates on air'axis'rat fright angles to the plane ofv the surface being mortised'. -As 'a result the mortised Vaperture is provided with rciirnd'ed corners which must either be eut awayor which 'must be used in conjunction withfhinges having rounded Corners. Thisl device also requires a Ygauge baiffas lflorrg as the door which is awkward to' ca'r'ryV about -and-tofhandle.

An object of the present linvention resides in the Vprovision of a hinge recess mortisin'g'toolwhich is inexpensive tov construct and which lisextre'rnely effective in its operation. Virtually all carpenters are equipped with a Asin-al1 portable electric drill. By mounting this drill in a suitable frarneand by equipping the drill With'a suitable drill bit it is vpossible to effectively mortiseA :the hinge recess at `-relatively low Cost. My device' is also useful` inqproviding mortises for cerainr'types o'strike platesV and other objects where the r'nortised recess Vfad'- joins` an edge 'of the door or frame.

Afeatureof the present invention resides Tin therprovision of a' mortising'tool which includes Vthree main parts. The iirst of these parts is a frame which lits against the door ordoor iramein the-locationof-the'area to be mortised. The second main part includes a slidable carriage which slide'swi'thin the supporting lfratrie and moves toward and away from one end of the Yfratrie. The Itlird main part includes a portable electr-ic Vdrill whichiia-Jperation is secured to the carriage to move' in cdnjnctio therewith.

A Jfeature of the present invention resides in` 'the' fact that the supporting frame andcarriage'are eifrrhely simple in nature and can be very inexpensively pr'diid. The carriage-is equipped with fastening'-inean'sf`suclia's U-bolts to clamp an electric drill to the carriage. Thus by inserting the electric drill on the carriage and tightening the two U-bolts, the apparatus is in readiness for operation.

A feature of the present invention resides in a means of easily adjusting the depth of recess. One side of the frame is equipped with an adjustable bracket Which is adjustable relative to the supporting frame. By adjusting this single bracket the depth of cut of the mortising blade may be adjusted.

A feature of the present invention resides in the provision of a mortising tool in which the cutting mortising blade is of relatively small diameter. The blade is simif2 lar'to -a twist drill-in most respects butfis provided with an end of different design. The end of the drill -is substantially at so-that when the inward movementof`the drill is limited, the blade will only cut toa certain distane from thedoor edge anda sharply dened edge isp'roduced.

:A further feature of the .present invention lies in Ethe simplicity of adjustment of the' apparatus. The length of the cut being formed and the positioning-'ofthe fiaiire relative yto the doorV frame or the door may `lie-adjustedV by'means'of screws or bolts. As a result no -special tools are required for setting the apparatus to kcut a rr'rrtising recess of the proper depth ands'ize.

These and other objects and-novel yfeatures of --the-'i n vention will be more clearly and fully set forth -ih the following speciciatio'n 'and claim.

In the `drawings Vforming-a part of the specification:

Figure 1 is a tside elevational 'view of the' apparatus in positionwto work upon f'a vertical 'door or door frame.

Figure 2 -is afcross sectional view through the apparatus, therpesition f the section being indicated by the lin"e 2"-2of Figure' 1.

i Figure V3"is""anferid elevational View of Vthe apparatus' when set to make a mortising lrecess =of depth.

Figure L4 isa view! similar 'to Figure 3 fbut #sheeting rthe apparatus-set to makefa shallo'werreces's. l

*Figure 5 yisafdetailed 'View of the'adjustingbra et.

Figurelsis 'a'rr'ielevational 'View 'of larg'e forfm f'the mortising bladefw'liich is employetl'- Vin the drill.

AI mortisi-ng'appa'rafusfis best illustrated :inPigirfres Ei and 2 of theldrwings Figure -l lsl'io'ws a 'gn'erallyfrec- -10 and $1.1 which `are-=coiinected at oneeijdby a crossfnieiriber 12 and at itheothe'r'- end 'by across nimbe'r l51-3. A crbs's member 14 iscoiinecfed b'e'twer'i fthe sides" 510 -a'nd 114 at right angles .to thefci'oss ii'h'efriber 1?2 :and adjacent -'t`o this c-ro'sszmem'ber.

tudinally extending "grooves 15' which 'are p ps 'nio'st' Clearlyillustratd in`FigLi-s 3 hdll Of the drawings. 4A'

carriage 16 vin theforn of a y'flat board o'r-siniilar structure is provided with tongues-17 whichA :engage into' 'the groovessadare slidabiy supported thereby. 'The carriage 16 is provided with a fshallwfrecess 19 llc'c'a'td centrally between itsfsides -ad intended to accommodate the lupper lsurface of-'an elect-fic drill 2t). The slip'e "of tendsipafarlell'w-thea l sfof iieveiieiit I'f the carriage '16. -A springer'isafchoed affaire eau' 211129112) thereafriage 16 and is anchored at the other end at 30 to the cross member 12 at one end of the frame. This spring 27 acts to draw the carriage 16 into one extreme position as illustrated in Figure 2 of the drawings.

The cross member 13 is provided at its center with a knob or handle 31 by means of which the frame may be held in proper relation to the door frame or to the door. This knob 31 permits the frame to be held in proper relation to the various door surfaces.

As best shown in Figures 2 and 5 of the drawings the frame sides 10 and 11 are notched at 32 to provide relatively short projections 33 which terminate in shoulders 34. The sides extend somewhat beyond the shoulders 34 as indicated at 35 so as to support the cross member 13 forwardly of the shoulders 34. One. surface t.

of the cross member 13 may be cut away or bevelled at 36 so that the portion being mortised may be more easily viewed and so that the `chips being formed may more easily be discharged.

Wood screws 37 are provided projecting .forwardly each of the shoulders 34 as best illustrated in Figure 5 of the drawings. These screws 37 may be adjusted to provide a proper` spacing between the shoulders 34 and the edge of the door or door frame and also to adjust for any variations in the edge of the door or frame. By screwing one or both of these screws inwardly the corresponding shoulder or shoulders 34 are moved closer to the door edge and obviously the two screws must be the same distance from the shoulders if the drill is to extend at right angles to the door edge if the door edge is square. Y

As best shown in Figures l and 2 of the drawings an adjustment screw 39 extends into the carriage 16 at one end thereof and the headed end of this screw extends through an aperture `40 in the cross member 12. This screw 39 may be threaded inwardly or outwardly in order to determine the extent of movement of the carriage 16. Thus by operation of this screw 39 the cutting drill or blade may be adjusted to provide the proper width of mortise.

One surface of the projecting end portion of a side member 11 is provided with a surface 41 which is resistant to slipping. For example, a strip of abrasive cloth may be adhered to this surface which engages the surface of the door or door frame. This assists in preventing the slipping of the frame relative to the part mortised during the operation of the apparatus.

' As best shown in Figures 1 and 5 of the drawings an adjustment bracket 42 is secured to the side edge of the frame side by means of clamping bolt 43 or other suitable means. The clamping bolts 43 extend through parallel slots 44 and the bracket 42 and permit movement of the bracket plate in a direction toward or away from the surface of member being mortised. Figure 3 shows the bracket plate 42 completely retracted and inY this case the cutting tool will cut a mortise of maximum depth. By adjusting the plate 42 toward the surface being mortised as indicated in Figure 4 of the drawings the entire frame is tilted to some extent, thereby decreasing the depth of the mortise.

The cutting drill, or blade, is best indicatedat 45 in Figure 6 of the drawings. As indicated'in this drawing the blade is somewhat similar to a twist drill and for the most part the end 46 of the drill is at or on a plane normal to the axis of the drill. However, opposite edges of the drill have short projecting cutting edges which act to cut into the wood and hold the drill on a true course. Y

The operation ofthe apparatus is believed obvious from the 'foregoing description. The drill 20vis rst mounted upon the carriage 16 and the cutting blade 45 is properly supported in the drill 20. The surfaceo'f the door and door frame to be mortised is laid out by drawing a line about the area to be mortised. A frame of the apparatus is next held against the surface to be` mortised and the bracket 42 is adjusted to provide the Aaffamata Y desired depth of cut. While holding the projecting sinds v35 of the frame side members 10 and 11 slightly spced from the surface to be mortised, the carriage 16 is maved f tising tool and while I have endeavored to set forth the forwardly to its extremity and the screw 39 is adjlisted so as to limit the cut to the proper length. Alternatively the length of cut into the door may be measured?A and the screw 39 moved until the head of the screw?` is a distance away from theV cross member 12 equal to, the depth of cut. y

The' frame is next held against the member to bef mortised with the drill even with an edge of the cut no be mortised. The carriage is then reciprocated to form a cut into the door or frame surface., The frame isiY thenV moved along the edge of the door a short distance and another cut made. This operationA is continued ultil the entire area has been mortised. By moving the cutting blade while in projected position throughout the flength of the mortised cut, the short humps or ridges between the individual cuts may be easily cut down. Alternatively these cuts may be smoothed down by a chisel or other such cutting tool.

In accordance with the patent statutes I have described the principles of construction and operation of my mor.

best embodiment thereof I desire to have it understood that obvious changes may be made within the scope of the following claim without departing from *thev spirit of my invention.

I claim:

A mortising tool for use with a power drill, the tool including a generally rectangular frame including a pair of spaced parallel sides connected at their ends by cross connecting members, the sides having guide grooves extending longitudinally thereof adjacent one longitudi nal edge thereof, a reciprocatory platform slidably supported in said guide grooves, drill encircling means on said platform designed to attach the power drill thereto, work' engaging notches in'said sides at one end thereof and in said one longitudinal edge of each, said Vnotches each providing two right angularly arranged stop shoulders, one shoulder of which extends parallel to said guide grooves, said one shoulder of each of said notches being on a plane substantially tangent to the rotatable cutting portion of the power drill on the side thereof most remote from said one longitudinal edge of said sides, adjustable means for selectively spacing either one of the right angularly arranged stop shoulders from the work piece and adjustable means to limit the sliding` movement of said reciprocatory platform, said cross member connecting said notched ends of said sides being located on the other longitudinal edges of said sides.

References Cited in the le of this patent UNITED STATES PATBNIS 501,683 Johnson July 18, 1893 V699,335 MacKenzie May 6, 1902 1,444,626 Maxim Feb. 6,l 1923 1,470,143 Buterbaugh Oct. 9, 1923 1,642,723 Wallace Sept. 20, 1927 1,865,576 Luginbuhl July 5, 1932 2,193,204 Nilson a Mar. 12, 1940 2,483,060 Niedelman et al. Sept. 27, 1949

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