Abstract:
A sheet punch assembled of a plurality of molded parts having a handle section with a stationary jaw and a trigger section pivotal about the handle section which trigger section has a movable jaw. The handle and trigger are oriented at about a right angle to the sheet to be punched. Punched discs are collected initially in the stationary jaw and caused to thereafter move into a trigger chamber having an exit door.

Description:
BACKGROUND OF THE INVENTION 
     Prior punches have employed pivotal grip handles (U.S. Pat. No. 341,756 and U.S. Pat. No. 3,261,073) and the paper sheets to be punched have been oriented at an angle to the grip handles (U.S. Pat. No. 4,072,554). Paper guides have also been proposed (U.S. Pat. No. 3,590,484). 
     SUMMARY OF THE INVENTION 
     Broadly, the present invention a molded punch for punching a sheet having jaws with handles where one handle is rotatable about a pivot point and where the handles are oriented at a substantial angle to the sheet. 
     It is a feature that the punch is composed of molded plastic parts including two housing parts held together when assembled by a forced fit arrangement. 
     Further, features are a handle disc collection container, die hole surfaces composed of the same material as the handle covers portions and a punch pin configuration. 
     Finally, it is a feature of the punch product that it is hangable on a display card. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is an exploded perspective view of the punch of the present invention including five (5) molded sections including a trigger section with a beak top section; 
     FIG. 2 is a right side elevational view of the punch; 
     FIG. 2a is a sectional view along line 2a--2a of FIG. 2 showing attachment of the beak top section; 
     FIG. 2b is a sectional view along line 2b--2b of FIG. 2a; 
     FIG. 3 is a left elevational sectional view of the punch in its open position; 
     FIG. 4 is a view the same as FIG. 3 except the punch is in its closed position; 
     FIG. 5 is an enlarged elevational section showing the punch die hole; 
     FIG. 6 is a partial sectional side elevational view of the trigger, a trigger insert with a door ajar; 
     FIG. 7 is a plan view with a cut-away showing travel transition of punch discs from base section beak to trigger container; 
     FIG. 8 is a punch display card with a button holder; 
     FIG. 9 is a sectional view showing a button stud assembled on a display card; 
     FIG. 9a is a sectional view along line 9a--9a of FIG. 8; 
     FIG. 10 is a front elevational view of the punch pin; 
     FIG. 11 is a side elevational view of the pin; and 
     FIG. 12 is a sectional view of the upper jaw showing the pin held by a jaw stud. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
     In the FIGS. 1-7, punch 10 comprises five (5) molded casing sections; half sections 2, 3, center trigger section 4 including insert section 5 and top beak cover section 6. Sections 2, 3 and 4 are aligned along hinge pin unit 14 including pins 14p and recess sockets 14s. Casing projection fasteners 8 are forced fitted into holes 19 (several of which are shown) to connect casing sections 2, 3 around center trigger section 4. 
     Turning to FIG. 3, punch 10 includes handle section 17h comprising sections 2, 3, convex hand support rear surface 17cs, lower jaw 17g, and hanger opening 17o. Punch 10 also includes spring recess mount 17m on handle section 17h which captures spring 18 around its outside diameter and stud 17p, molded as part of insert 5 controls the inside surface of spring 18. Lower jaw 17g of casing sections 2, 3 carries paper limit and hold-down guide 15. Guide 15 has vertical sheet stop 15s and horizontal hold-down rail 15r. Also shown is die hole 20 defined by two (2) semicircular walls 20a, 20b on sections 2, 3. Die hole 20 has upper opening 20u and lower opening 201. Walls 20a, 20b are at about a 10° angle w to vertical v. Circular opening 20u is smaller in diameter than circular opening 201 to provide an additional volume below opening 20u (which opening determines the punched disc size) so that discs 23 can expand after their formation as discs which expansion assists in preventing discs 23 from moving upwardly through opening 20u when the punch pin 32 moves upward after punching of the sheet S. 
     Trigger 4 includes upper jaw 4j with stud 16d for mounting of metallic punch pin 32. Trigger 4 also includes trigger hand-support concave contour body 16t with paper punch ring or disc container 16r. Punch rings 23 as punched out of sheet S pass from lower jaw chamber 17c into trigger unit 4 (see FIGS. 3, 4 and 7). Upper trigger 4 entrance portion 16 is divided into two (2) ring receiver entrance areas 16a, b (See FIG. 7). Finally, rings 23 collect in the bottom of chamber 16r and are emptied through hinged door 26. Door 26 swings about flexible hinge 26h which is integral with the rest of insert 5. Door 26 includes latch configuration 26l which engages chamber lip 16l to hold door 26 closed. 
     In FIG. 2b it is seen that grooves 6a, 6b, located in cap 6, each have an indentation 40, 41 respectively. Horizontal portion 30c also has curved protrusions 42, 43 which snap into indentations 40, 41 after cap 6 has been slid along portion 30c a certain distance. This arrangement locks cap 6 in place without adhesives or other connectors. 
     In FIG. 2a the sliding force-fit connection of cap 6 with grooves 6a, 6b on trigger portion 30c is shown. 
     FIGS. 4 and 7 show how cutout sheet rings 23 travel along curved jaw surface 25 of lower jaw 17g located in base handle section 17h to compartment 16r in trigger section 16. 
     In FIGS. 8, 9 and 9a, display card 29 has hole 31 formed by cross cuts 31a, 31b. Button card stud 24 is inserted through hole 31 until head 24h engages card 29. Card stud 24 also includes stem 24s. Punch 10 has an exterior side opening 33 in casing section 3 in socket 14s. 
     Contained in socket 14s as part of section 3 is tapered bore 41 terminating in shoulder bore portion 42. Shoulder bore portion 42 has a diameter which is smaller than the diameter of stud stem 24s. When stud stem 24s is placed through casing opening 33 and press fitted through the taper bore portion 41, tip stem portion 24tp of stem 24s (FIG. 9) is compressed to pass beyond the shoulder bore portion 42 into pivot pin passageway 14pr. As tip portion 24tp enters passageway 14pr it restores itself to form a mushroom head 24m as shown in dashed lines in FIG. 9a. Head 24m provides engagement by resisting withdrawal of stem 24s. Polypropylene stud 24 is softer and more deformable than casing section 3. 
     Turning to FIGS. 10-12, punch pin 32 has cylindrical body 32b and concave cutting surface 32s including cutting perimeter 32p with center hole 34 therein. Hole 34 includes first diameter portion 34a, mid portion 34b and last portion 34c. The first and last portions 34a, 34c are cylindrical in shape. 
     Punch 32 is mounted on jaw stud 36 located on upper jaw 4j which stud 36 is initially cylindrical in shape (see solid lines in FIG. 12). Upon placing pin 32 on stud 36 during assembly, stud 36 is deformed by heat and pressure to cause stud 36 to take a head shape 36h (shown in dotted lines in FIG. 12). Stud head 36h cannot pass through pin portion 34a thus holding pin 32 in place on jaw 4j. 
     Further shown in FIG. 12 is pivot 14 and the arc B through which pin 32 swings during its punching a punch hole in sheet S. The arc B and sheet S are positioned such that the punch perimeter portion 32pn nearest pivot 14 engages sheet S before the perimeter portion 32pf further away engages sheet S. Distance d 2  is smaller than distance d 1 . 
     Turning back to FIG. 5 the opening 20 composed of semi-circular surfaces 20a of section 3 and 20b of section 2. Surfaces 20a, b are made of same material as sections 2, 3 which preferably is about 70% nylon and 30% glass fibers (by volume). Due to the hardness and wear properties of the materials of sections 2, 3, hole 20 provides a good cutting surface in cooperation with cylindrical metal punch pin 32. Insert 5 is made of polypropylene (FIG. 1). 
     In the operation of punch 10, the operator&#39;s hand grips the punch handle portion engaging surfaces 17cs, 16t at an angle to line SL which is substantially 90° from line SL. Line SL lies in the plane of the to-be-punched sheet S. Handle position relative to line SL is measured by handle lines HL which pass through axis pin 14 and points P, PP on arc A (which arc is inscribed about point 14). There is a range of handle lines (HL) between P and PP intersecting arc A including forward handle line HLF, middle handle line HLM and rear handle line HLR. The angle a between lines HLR and SL is preferably about 120 degrees and the angle b between lines HLF and HLR is preferably about 45° providing a range of 75°. These angles between hand grip and sheet S provide ergonomic ease of use by the punch operator even when repeated use is required.