Patent GB-440792-A (GB)
Title: Process and device for fixing hinging strips to tin boxes
IPC: B21D51/52
Filed: 1935-07-09
Abstract: 440,792. Machines for attaching hinge strips to boxes. JAGENBERGWERKE AKT.-GES., 107, Himmelgeisterstrasse, D³sseldorf, Germany. July 9, 1935, No. 19643. Convention date, July 9, 1934. [Class 18] The flexible strip S serving as hinge of a sheet metal box is sharply folded to form a crease line before it is secured to the box body U and lid D. In one form of apparatus, the lids D are removed from a track 1 provided with heating elements h and are placed into a position I by plungers 2, 3. Strip material b<1>, coated with guttapercha or other material which becomes adhesive when heated, is fed by intermittently actuated rolls 11, 12, Fig. 8, through a folding channel 9 within which is arranged a stationary folding blade to a cutter 25 which cuts it into strips S, and a suction device 27 lifts the severed strips from the cutter and places them successively into the lids at position I. The box bodies U are fed with their open ends upward upon a conveyer bell 28 to prevent cutting of the belt by sharp edges of the bodies, and are placed successively by plungers 30, 31 into an intermittently oscillated device 33 by which the bodies are inverted before being fed to an inclined track 37 provided with heating elements h. From the track 37 the box bodies are, at position II, pushed by a plunger 44 having an angle - shaped head 45 into the box lid and pressed against the folded strip S which has been applied to the lid. Cam-actuated guides 46 are provided for centring the body so that it enters the lid smoothly, together with a flap member 52, also cam-actuated, for closing the box. The closed box is pushed from position II along a track 53 provided with a heating element h to ensure that the guttapercha remains tacky for an interval sufficient for good adherance to the box parts, and at a later position along the track, with a cooling device for hardening the guttapercha so that the boxes can be opened. A fixed electromagnet, which holds the lid, and an electromagnet mounted upon a pivoted arm and which engages the box bottom are provided for opening each box at position III. Siibsequently the strip within the opened box is engaged at positions IV to VII by pressing jaws which are shorter than the strip, so that parts of the strip are rendered tacky while the guttapercha upon the remainder of the strip remains hard so that a good connection between the strip and box parts is further ensured. In a modified apparatus, Fig. 18, the strip material b<1> after passing through the folding device 9 passes over rolls 106-108 by which it is straightened out again, and the box lids D and bodies U are both fed to the assembling position with their open ends upward. The bodies and lids are positioned substantially as shown in Fig. 17, and the severed strips S are applied to the parts by a plunger formed in two parts, one of which engages that part of the strip registering with the lid and is resiliently mounted in the other part so as to have a lost motion. Nozzles 121, 122 supplying cold air may be provided for cooling and hardening the guttapercha upon the strips.