US 931869 A
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W. V.. HEINZ. WALL PLUG.
APPLIUATION FILED 0011.22.1908.
Patented. Aug. 24,1909.
to make the plug of a little heavier plat-c and, vset it less into the wall so that the flanges 5 pressing it back,` until the nail point'reaches the first projection 8 of the lower fold. By this projection the nail point is diverted upwardly curving the pocket wall upwardly at a, and, being farther drivenin, it approaches and strikes the second projection 6 (being the iirst one of the upper fold) and is thereby lgradually vcurved downward until it reaches and passes said second projection, curving the nether side of the fold downward as seen at Z), and so on throughout its course Befqre the driving of the nail .the interior walls of the pocket are straight and somewhat yielding to the nails movement between the projections, but after the driving the walls along the path of the nail are slightly spread apart at all points and slightly curved up and down at alternate arts aber@ and below the projections, forming a slightly Zig-zag course conforming to the similar shape of the nail.
The construction affords large bearing surface on the nail. at 'all points lwith much pressure, and also gives a positive or shoulder grip additional formed by said zig-zag course.
1While it is possible by the action of the ingoing nail to spread the pocket. walls when embedded in the hardest concrete sufficiently te provide intense pressure for the frictional grip on the nail and a reasonable amount of the. zig-zag course, the latter may be in creased by applying a hea vy coat of softer material, as japan or the like, tothe outside of the pocket walls which will permit freer outward yield of said Walls to the action of the nail atthe points between the stitfcning projection 6.
For attaching metal lath to walls l prefer will project out from the Wall farther than when the iurring strip is used and then nail the metal lath directly against said flanges.
The costof producing the plug is -very l cheap and the rate lof production very rapid by machinery. I contemplate making the,
plug at the rate of 100 per minute, by the use of a suitable shearing and embossing die, and the labor of a boy.
It is noted that the corrugations 7 at the margin of the folds are but half the thickness of the pockets and are extended from thefolds on both sides of the pocket. Ub- \'iously these mio-ht be made the full thickness of the pocket andlbe placed one on either margin of the folds without altering the character of the services or the manner of making or usiugit.
What I claim and desire to secure by Letters Patent is l. An improved wall-plug comprising a metalplate folded at its mld-length, a series of stiifening projections on the outside of each of the folds running cross-Wise and alternating on opposite'sides of the pocket and an inward projection on each of thc folds run lengtlrwise along an outer margin thereof, as specified.
2. An improved wall-plug comprising a.
metal plate folded at its mid-length, a series of outwardly extending ridges on each of the folds arranged cross-wise and alternatingl with oneanother on opposite sides of the pocket and inward projections on each 'of the folds arranged lengthwise along coincident side margins thereof, as specified.-
An improved wall-plug comprising a llat. metal plate folded at its mid-length to form a pocket means for stifening the folds at intervals arrai'lged cross-Wise of the folds, l
and alternating on opposite sides of the pocket, and inwardly projecting stops at the margins of the folds for closing the pocket.
at opposite' edges and determining the space between the folds, as specified.
I WM. V. HEINZ. -IV itnesses:
l5. J. Fernuni, J. W. Kraun.