US2317462A

US2317462A - Strike plate gauge

Info

Publication number: US2317462A
Application number: US446583A
Authority: US
Inventors: Jacob M Johnson
Original assignee: Individual
Current assignee: Individual
Priority date: 1942-06-11
Filing date: 1942-06-11
Publication date: 1943-04-27
Anticipated expiration: 1960-04-27

Description

Flcio.

`April 27,` 1943 J. M. JOHNSON STRIKE PLATE GAUGES Filedqune 11, 1942 Patented Apr. 27, 1943 UN-lT'ED STATES PATENT GFFIICE STRIKE PLATE `GAUGE Jacob M. Johnson, Fargo, N. Dak.

Application June 11, 194.2, Serial No. 446,583

l Claim.

This invention relates to gauges for correctly locating a lock strike plate upon a door jamb. The main object of the invention is to provide a relatively simple and practical device for quickly and correctly locating such strike plate on a door jamb and marking the outlines thereof for mortising the jamb to receive the plate in proper alignment with the lock bolts.

A preferred embodiment of the invention is shown in the accompanying drawing, wherein:

Figure 1 is a perspective View of the gauge, constructed in accordance with this invention.

Figure 2 is a sectional detail on the line 2--2 of Figure 1.

Figure 3 is a section cn the line ure 1.

Figure 4 is a section on the line of 'f ure 1.

Figure 5 is a section on the line ure 1, v

Figure 5 is a top plan view of the gauge, on a reduced scale, showing also a conventional 'strike plate mounted thereon for gauging the same, this constituting the iirst step in the operation of mounting the plate on the door jarnb.

Figure 7 is a plan View of the gauge asapplied upon a door and a bolt of the lock thereof, for gauging the space lbetween the bolt and inner iace of the door, and for setting the scribepoints at opposite end of the gauge for marking the iocation of the strike plate. A fragmentary 'Section ci the door is here shown. This view illustrates the second step of operation.

Figure 8 shows an edge View of the gauge and 3-3 of Fig- -a face view of the edge of the door, illustrating the application of the gauge to the door and lock bolt, as shown in Figure "I,

AFigure 9 is a face View of the gauge as applied at its scribing end to the jamb of the door frame preparatory to marking the lateral limits of the strike plate on the jamb, this constituting the third step of operation. A fragment of the jamb is shown.

Figure 10 is an edge View of the gauge and a fragmentary sectional View of the jamb, according to the view of Figure 9.

Figure 11 is an enlarged sectional detail on the line II-II of Figure 9.

In practising the invention I provide an oblong base plate 5, including a flat bottom B formed with raised lateral margins or guide rails 1 extend in parallel relation and undercut or grooved at 8 from end to end. The rear end of the plate 5 is turned up and over inwardly in spaced relation above the bottom B to form a screw receiving lip 9, and the forward end is turned up perpendicularly to provide a stop lip IIJ.

An elongated work slot I I is formed in the bottom 6 at one side thereof, the same extending from a medial point of the bottom and opening out through the forward end, and including a recess or portl Ila cut through the stop lip I0. The margins of this slot are parallel with each other and with the guide rails l.

A laterally elongated slot I2 is cut through the upturned rear lip 9 immediately above the bottom S, and three elongated gauge strips or slides I3, I4, I5, of equal width and approximately equal length with each other and the base plate 5, are slidably inserted side by .side through the slot I2 and within the space between the guide rails 'I, the width of the said gauge-strips being such as to nicely ll the space between the rails T. The lateral margins of the slides I3, Ill, I5, are grooved vand feathered or splined, as shown at Iii, I'I, so as to nicely dovetail together or intermesh in slidable interengagement with each other and with the lateral grooves 8 ci the rails l, thus holding these elements all nicely and slidably interlocked.

Work lugs I8, IS, 2i] are seated in the upper sides of the forward ends of the slides I3, I4, I5. The lugs I9, 2li of the slides I4, I5, are extended or offset laterally toward one another, in mutual overlapping relation and in longitudinal alignment (see Figs. 1 and 7), and the lug 2!! is dimensioned to pass fully into the recess or port IIa, flush with the stop lip Ill. A stop screw 2| in the rear end of the slide I5 abuts the lip Il, as the slide is pushed in, simultaneously as the lug 2li enters the recess Ila, thus limiting further movement forward of this slide. Sharpened scribing lugs 22, 23, are seated in the under sides of ythe forward ends of the slides I4, I5, beneath the lugs I9, 20, and are positioned to work in longitudinal alignment through the slot Il (see Fig. 11) These scribing lugs project through the bottom 6 (see Figs. 8, 10, 11), and are oiset towards one another relative to their respective work lugs I9, 20, so that their points are aligned with the inner or adjacent faces of the work lugs i9, 20. Thus the lateral dimension of a strike plate 24 (Fig. 6) held snugly between the lugs I9, 2li, may be exactly marked upon a door jamb 25 by pressing the points into the jamb and moving the device vertically.

A two-way work lug 26 is rigidly and perpendicularly mounted at the rear end of the slide I3, and a scale of measure calibrations 21 are stamped upon the face of the slide inwardly of the lug 26 and so as to measure the space be tween the inner side of that lug and the adjacent corner 9a of the lip 9. Thus by placing this corner 9a against the closing or stop margin of a door 28, and then drawing out the measure slide I3 and placing the stop 26 snugly at the flat side of the lock bolt 29, the space subtended will be indicated on the scale 21.

A boss 30 is seated medially on the turned lip 9, and this boss and lip are tapped to receive a knurled thumb-screw or center slide lock screw 3| turned down therethrough'. An elongated press spring or clip 32 of thin spring metal, folded length-wise upon itself and thus U-shaped in cross-section, is inserted, bight innermost, between the over-turned lip 9 and the rear ends of the slides I3, I4, I5, the stem of the screw 3| being passed freely and medially through the upper leaf thereof, with the end of thescrew adapted to screw down upon the lower leaf and force the latter down onto the said slides. 'Ihe lower leaf of this clip 32 is waved or sinuous,Y as indicated at 32a in Figure 3, so that the lower leaf immediately under the end of the screw will press primarily upon the central slide I4, for locking that slide against longitudinal movement, while the lateral slides I3 and I5 may still be so moved. Another boss 33 is freely seated forwardly on the center slide I4, the base thereof being ared laterally to overlap the lateral slides I3 and I5, this boss being locked against rotary movement by a marginal teat 33a depended from its under face into a pin-hole 34 ,formed in the slide I4. The boss 33 and the slide I4 are tapped perpendicularly down through to receive a knurled thumb screw 35 formed with a shoulder 35a below the knurled head. By turning down the screw 35 until the shoulder strikes the boss, the flared basal margins of the boss overlapping the lateral slides, are forced upon those slides, thus locking the three slides I3, I4, I5, together to move as a unit. rThe under face of the boss 33 is concaved to form lateral feet 3317, adapted to firmly engage the lateral slides, for releasably locking them all together to move as a unit in the lateral guide rails l.

In use, the screws 3|, 35 are loosened and the slide I3 is drawn out about one-half inch. Slide I4 is drawn out or back full length and slide I5 is pushed fully in or forwardly. The strike plate 24 is then laid upon the forward end of the gauge, with its back edge snug against the stoplip I, with the bolt opening 24a over the work lug I8 on the slide |3. Then push the slide'I4 in forwardly, pressing work lug I9 rmly against n the front edge of the strike plate. Then tighten the screw 3|, and pull out the slide I3 until work lug I8 is snug against the outer margin of bolt opening 24a of the strike plate. The work-lug 20 of slide I5 will now be snug against the back edge of the strike plate. Now tighten the screw 35, thus locking the three slides together. The scribing points 22, 23, are now set to mark or cut on the door jamb the exact width of the strike plate. Then loosen the screw 3|, pull out the three slides together and remove the strike plate. Then place the corner 9a of the gauge against the free margin of the door, at the closing or stop side thereof and across the lock bolt 29. Then push the slide bars inward to bring the work lug 26 up against the outer, flat side of the bolt and tighten the screw 3|. Next locate the height of the strike plate on the door jainb 25 and make pencil marks at top and bottom of the plate and plate lug 24h. Then holdthe stop lip I0 rmly against the stop 25a of the door jamb and look through the opening between slides I4, I5 to locate pencil marks. Then press the gauge against the jamb so that the scribing points` 22, 23, will mark the lateral limits of the strike plate on the door jamb. A chisel can Ythen be used to recess the jamb for fully seating the plate, if desired that the plate be so inset.

While I have shown and described a certain embodiment of the invention and specific structural features thereof, any desired changes, alterations or additions may be made, within the scope of the claim.

I claim:

In a device of the kind described, an oblong base plate turned up at its ends to form lips at the front and rear ends thereof, the rear lip being slotted along its base, parallel guide rails on the lateral margins of the upper side of the base plate, the said plate being formed with an elongate work slot adjacent one guide rail and opening out through the lip and the forward end of the plate, three elongated gauge slides inserted through the slot of the rear lip for independent slidable movement within the space between the guide rails, work lugs seatedin the upper sides of the forward ends of the three slides, the two lugs immediately at the said work slot being oifset toward one another to mutually overlap these two slides,.scribe lugs seated in the under sides ofthe forward ends of the slides at the Work slot, and offset vto work in longitudinal alignment through said slot, a two-way work lug vrigidly andperpendicularly mounted at the rear vend of the lateral slide remote from the work slot, means for releasably locking thethree slides to move in unison relative to the base plate, and separate means for releasably locking the center Yslide against movement relative to the base plate.

' JACOB M. JOHNSON.