Patent GB-299827-A (GB)
Title: Improvements in apparatus for tightening and fastening string or the like employed in tying up packages or the like
IPC: B65B13/34
Filed: 1927-08-02
Abstract: 299,827. Wollaston, H. J. Buchanan- Aug. 2, 1927. Angular bending; binding and covering; bending-dies.-The two ends of a string used in tying a package or the like are secured by a sheetmetal seal, the opposite ends of which may be curled around an end of the string, or the seal may be wound in a single curl around both ends, the sealing tool employed being provided with two jaws both of which are slidable inwardly along a plane surface or base plate and are provided with grooves which impart the curl to the sealing-piece. The tool may be provided with means for feeding a strip of metal into position and shearing therefrom a portion to form the seal. In one form of tool the jaws or curling-members 1, Figs. 1 and 2, are mounted upon a right and left-handed screw 4 connected by a universal joint to a rotatable shaft 5 which may be operated either by a treadle or power. The jaws move laterally adjacent to a longitudinal guide 7 formed upon a baseplate 3 by a steel cover-plate mounted upon distance pieces 8, the lower-edge of the cover-plate being sharpened to form a cutting-edge. A length of metal strip 6 fed down within the channel to the space between the jaws is sheared off from the main length when the jaws are moved inwardly to curl the two sides of the metal around the ends of a string which is passed around a package, the tool preferably being suspended vertically by a counterweighted cord through a hole 10 in the baseplate. The two ends of the string are pulled upwardly relatively to the jaws to increase the tension produced by the inward movement of the jaws. A guide roller 15 is provided on the base plate to direct the strip into the channel 7 from a supply reel 11. The means for feeding the strip comprises a pinion 13, Fig. 3, mounted on the central portion of the screw 4 and having about four teeth to engage a similar number of teeth upon a rack 12 carrying a spring-pawl 14 which engages in perforations provided in the strip, the teeth being so arranged that the strip is fed into position during the initial movement of the slides towards one another. A spring stop prevents rearward movement of the strip. The sealing-piece may be combined with a label, Fig. 7, by providing it with a tongue to which the upper end of the label L is attached. A tool adapted for securing a seal of this kind comprises a pair of pivoted arms 15, Fig. 4, connected by links 17 to a slotted plate 16 carrying at its upper end a transverse plate 2 along which the grooved jaws 1 move when the arms 15 are compressed against the action of a spring 18. An undercut stop 20 is provided on the plate 2 to engage a recess 22 on the top edge of the seal, and spaced pegs 19 on the plate 2 engage on either side of the tongue to retain the seal and label in a central poisition relatively to the jaws. The sealing-piece may be provided with teeth 24 to increase the grip upon the string, the teeth either being turned inwardly prior to the use of the seal, or turned during the compression of the jaws by providing projecting rims on the sides of the latter. The arms 15 of the tool may be adapted to be operated by a treadle by connecting a Bowden mechanism thereto, and extending the plate 16 upwardly to form means for suspension. The operating-faces of the jaws or slides may be formed with fine projections to produce markings which form means for detecting tampering, and edges may be provided thereon for cutting the string. The shape of the grooves in the jaws is varied according to whether a single or double tube is to be formed from the sealing-piece.