The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 26, 1993
Filed:
Apr. 18, 1991
James E Martin, Mason, OH (US);
Richard G Robison, Cincinnati, OH (US);
International Paper Company, Purchase, NY (US);
Abstract
An apparatus for testing the tear strength of a tear strip in a paperboard blank. The blank is placed on and clamped to the apparatus, the latter having a force gauge mounted on it. One end of a flexible wire has a clip fastener which is attached to the end of the pull tab in the paperboard blank. The other end of the flexible wire is attached to the force gauge, the gauge measuring the amount of force required to rip the tear strip from the surrounding paperboard blank. In one embodiment of the invention, a motor is mounted on the apparatus and pulls the force gauge, the flexible wire passing around a pulley mounted on the apparatus and leading to the clip fastener. In another embodiment, the flexible wire passes over several pulleys, one of which is secured to a travelling, non-rotating nut. The nut is carried by a threaded rod rotatably journaled in the frame. A motor is coupled to the rod to rotate it, thereby pulling on the clip fastener upon movement of the nut.