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Patented Jan 12 1892.
THE 10H.S PETERS PHoT.. THO.. WRSHINOTOH O.
UNITED. STATES PATENT . OFFICE
PHILIP LINDEMEYER OF. BALTIMORE MARYLAND ASSIGNOR TO ISAAC
SPECIFICATION forming part of Letters Patent No. dated January 12 1892.
Application filed August 20 1889. Serial No. . (No model)
To alt whom it irzay concern:
Be it known that I PHILIP LINDEMEYER a resident of Baltimore in the State of Maryland have invented certain new and useful
5 Improvements in Paper Boxes and I do hereby declare the following to be a full clear and exact description of the invention such as will enable others skilled in the art to which it pertains to make and use the same.
io The object of the invention is to provide an improved paper box that can be made from a single blank and closed and secured at each end by overlapping pieces provided with double locks of a particular form. Heretofore
15 it has been found in boxes of this general character having a single lock that it was liable to become disengaged or unlocked by external or internal pressure and particularly during the operation of filling the same
20 as for example with candy. In such case it is desirable to settle the contents of the partiallyfilled box by shaking or agitating it and such operation has been very liable in prior constructions to shake loose the lock at
25 the end opposite to that into which the candy or other material is being supplied. Furthermore constructions employing a double lock have been liable to tear out and particularly where two slots were formed in one flap to re
3o ceive corresponding parts suitably shaped on an opposing flap. Double locks heretofore employed have also been liable to disengagement in filling the boxes as above specified of single locks owing to the want of lateral
35 hooks shaped situated and operating as those herein set forth.
According to the present improvement a double lock is formed that will not be loosened by pressure against either its exterior or in
40 terior surface but which will be rather tightened thereby and one which while securing this important advantage also avoids the use of two slots in one flap and the weakening effect of such construction.
45 The invention consists in the construction
hereinafter described and pointed out.
In the accompanying drawings which form
part of this specification Figure 1 is a per
spective view of the improved box. Fig. 2 5o represents a blank cut in suitable form for
making a box. Fig. 3 represents a modifiedform of the same and Fig. 4 is a view of a' modified detail.
The referencefigures 1 1 indicate portions
of the blank which form two opposite sides 55 and 2 2 indicate parts which form two sides at right angles to the parts 1 1. The parts 3 3 form the ends lying underneath the lockinglaps 4 4. The part 11 constitutes a usual feature of construction whereby the ends of 6o a boxblank are secured together.
To form the lock each flap 4 is provided with a tongue 5 having a projection 6 at one side of the flap and with a slot 7 at the other side which slot is preferably made in angu 65 lar form as shown. The projection 6 is formed by cutting a curve S at the side of the tongue which curve connects with a straight edge 10 cut as represented. The main part of the slot
7 lies in a direction approximately at right 70 angles to the edge 10.
To form the box after the blank is prepared it is first folded on the lines a b a b so as to bring similar parts opposite each other the small portion 11 being made to extend under 75 the outer edge of 2 and glued or otherwise secured thereto. The parts 3 3 are then folded on the line c c or d d so as to be at right angles with parts 1 and 2. Thus folded they overlap each other and constitute the main 8o portion of the ends of the box. The parts 4 4 are subsequently folded down upon line c c or d d so as to bring the righthand tongues over the lefthand slots and vice versa. By springing the adjacent parts 4 4 laterally in 85 opposite directions each tongue can readily be entered in its corresponding slot the hook or projection 6 slipping through the inner end of the slot and the parts 4 4 are then moved back laterally until the straightedges 10 10 90 are in contact as represented in Fig. 1. These edges 10 10 cross each other at an acute angle as shown and form a stop to prevent the accidental removal of the hooks or projections 6 from the slots. These projections are 95 in curved form (they may be angular but should have a hook form) and engage the inner ends of the slots which they cannot do unless they are so shaped that when entered
in the slots their extremities can slip back ioo behind the edge of the slot by which they were passed in entering the samethat is to.
say if they were not made in hook form
substantially as shown and described. Such projections will engage the wall of the slot at its end all the more firmly when pressure is applied to the end of the box and they cannot be drawn out as are projections which have their edges extending only in the direction in which they are entered in the slots. The locking connection is readily made by io slightly bending or springing the flaps in
which are formed the tongues and slots and
thrusting the tongues into the corresponding
slots and this connection can be unmade when
desired without difficulty while the crossing 15 of the edges 10 10 and their consequent en
gagement and the alternate overlapping of
the flaps on their two sides effectually pre
vent accidental separation.
As indicated in the drawings my improved zo lap and lock are adapted to boxes of dissimi
lar forms Figs. 1 and 2 indicating blanks
suitable for rectangular and wedge shaped
boxes respectively and the improvement is
therefore not limited in this respect. It is 25 also obvious that the size of the tongues and slots may be varied and that the latter may be made in one straight line and also by cutting out or removing a part of the material. The particular form of the curve is not essential nor is it essential that edges 10 10 should be made straight as they may be formed as indicated in Fig. 4 or otherwise shaped. It is further obvious that the locking devices may be omitted at one end of the box and that a plain end piece secured in any ordinary way may be substituted.
It may be noted that the usual strain or pull upon the wall of the slots 7 caused by .pressure from within the box for example is not in the direction of the slot but transverse 40 to its direction as indicated by the arrow. To add strength to the parts in the direction of the slot however it is only necessary to curve the lines 10 as in Fig. 4 but this is not essential. 45
Having thus described my invention what I desire to secure by Letters Patent is as follows:
1. A folded box having its ends composed in part of flaps provided with the tongues 50 having lateral hooks and with slots the hooks of the tongues engaging the edge of the slot said flaps having their edges between the slots running in the same direction as the tongues and lying in planes which cross each other 55 at an acute angle whereby the edges abut throughout their whole length and form a practical stop substantially as set forth.
2. A blank comprising similar parts in the usual form adapted to constitute the sides 60 and ends of the box and having flaps adapted to constitute in part the ends provided with tongues having lateral hooks and with slots the hooks of the tongues being suitable to engage the edges of the slots said flaps having 65 each an edge 10 running in the same direction as the tongue and adapted when placed in operative position to cross the other at an acute angle substantially as set forth.
In testimony whereof I have signed this 7o specification in the presence of two subscribing witnesses.
PHILIP LINDEMEYEP. Witnesses:
FRANK DE S. BENZINGER
3 OS. DEUTSCH.