Portable apparatus for fastening casings and the like

Claim 1

IN A DEVICE FOR FASTENING A STAPLE TO THE END OF A CASING OR LIKE ARTICLE WHEREIN A STAPLE IS FED BY A PUNCH ALONG A TRACK IN A HOUSING FROM A MAGAZINE INTO ENGAGEMENT WITH A DIE, DRIVING MEANS FOR ACTUATING SAID PUNCH COMPRISING: AN ELONGATED SLIDE MEMBER INCLUDING A PUNCH LONGITUDINALLY DISPOSED RELATIVE TO SAID TRACK, A LEVER SWINGABLY MOUNTED RELATIVE TO SAID HOUSING FOR MOVEMENT FROM AN OUTER TO AN INNER POSITION AND VISE VERSA, A CONNECTING MEMBER INTERPOSED BETWEEN SAID LEVER SAID SLIDE MEMBER FOR CONVERTING SWINGING MOVEMENT OF SAID LEVER TO TRANSLATION OF SAID SLIDE MEMBER, SAID SLIDE MEMBER BEING PROVIDED WITH THREE SHOULDERS SPACED APART LONGITUDINALLY OF SAID TRACK AND ADAPTED TO BE ENGAGED SUCCESSIVELY BY SAID CONNECTING MEMBER FOR MOVING SAID PUNCH THROUGH SUCCESSIVE PARTIAL STROKES IN THE SAME DIRECTION UPON SUCCESSIVE ACTUATIONS OF SAID LEVER FROM AN OUTER TO AN INNER POSITION, THE FIRST AND SECOND SHOULDER ENGAGED BY SAID CONNECTING MEMBER BEING SPACED APART A RELATIVELY LARGE DISTANCE COMPARED TO THE SPACING BETWEEN THE SECOND AND THIRD SHOULDERS, WHEREBY SAID LEVER MAY BE SWUNG THROUGH A RELATIVELY LARGE ARC FOR ADVANCING SAID STAPLE A RELATIVELY GREAT DISTANCE ALONG SAID TRACK UPON THE FIRST AND SECOND ACTUATIONS OF SAID LEVER FROM AN OUTER TO INNER POSITION, AND WHEREBY SAID LEVER IS SWUNG THROUGH A SMALLER ARC CORRESPONDING TO A SMALLER ADVANCEMENT OF SAID STAPE UPON A THIRD ACTUATION OF SAID LEVER.