US2387808A - Calendar edging and calendar and method and machine for assembling same - Google Patents

Description

Oct 30, 1945. J. 1.. PRUNEAU ETAL 2,387,803

CALENDAR EDGING' AND CALENDAR AND METHOD AND MACHINE FOR ASSEMBLING SAME Filed 001;. 4, 1943 3 Sheets- 51169? 1 Jfforneys L. PRUNEAU ETAL CALENDAR EDGING AND CALENDAR Oct. 30, 1945.

AND METHOD AND MACHINE FOR ASSEMBLING SAME Filed Oct 4, 1943 5 sheets-sheet 2 2-H HilHHQHHHH HH- l LQW r a m. N m; 8 mm; W m m a a 5 HM w a; 6 MW m w m a NM JJ J %N mN 3 iii;

30, 1945- J. PRUNEAU ET AL 2,387,803

CALENDAR EDGING AND CALENDAR AND METHOD AND v MACHINE FOR ASSEMBLING SAME Filed Oct. 4, 1943 3 Sheets-Sheet 5 F/5t6. 131 a1 L 50 N 58 43 X 62 66 59 42 7 3W1 55 J2 w 1 41 45 4 1- i 55 g 17 H 60 '60 25 g i a 15 1 52.

57 I 61 34! 61 34 57 j '50 5 a] 5 51 1 10 1 45 28 F 1 Inz/rzfvmx MINI zfbfi qpi Z.Prz2neaz M! Jameqflu/laZ/y W Jme J'I'Jdrzrafian tiaryieya Patented Oct. 30, 1945 CALENDAR EDGING AND CALENDAR AND IVIETHOD AND MACHINE FOR ASSEMBLING SAME Joseph L. Pruneau, Chicago, James Mullally, River Grove, and James F. Hanrahan, Chicago, Ill., assignors to Paper Converting and Finishing Company, Chicago, 111., a corporation of Illinois Application October 4, 1943, Serial No. 504,896

8 Claims.

ings it has been common practice to make such calendar edgings of metal strips suitably bent or formed to embrace and grip one end portion of a plurality or pad of calendar sheets. However, metal is no longer available for use in making such calendar edgings and while attempts have heretofore been made to make such calendar edgings from paper or like material these attempts have not, insofar as we are aware, been entirely successful.

Accordingly, an object of the present invention is to provide a new and improved calendar edging made of paper or like cellulosic material and to provide a novel machine and method for assembling the new calendar edging together with a pad of calendar sheets to provide the new calendar.

Another object of the invention is to provide a new and improved calendar edging and calendar embodying the same and which are relatively simpler and less expensive in construction than calendar edgings and calendars heretofore made.

A further object of the invention is to provide a novel machine for assembling the new calendar edging together with a pad of calendar sheets so as to provide the new calendar.

An additional object of the invention is to provide in the new machine a novel means for forcing each of the adhesivel coated locking tabs or tongues up out of the openings in the bottomwall of the calendar edging in which they are formed and through an opening formed in the pad of calendar sheets with which the new calendar edging is to be used so as to bring one end portion of each of the adhesively coated locking tabs or tongues into a position above the uppermost sheet in the pad of calendar sheets and into position to be secured to the adhesively coated bottom wall of the new calendar edging during a subsequent step in the operation of the new machine.

Other and further objects of the present invention will be apparent from the following description and claims and are illustrated in the accompanying drawings which, by way of illustration, show preferred embodiments and the principles thereof and what We now consider to be the best mode in which we have contemplated applying those principles. Other embodiments of the invention embodying the same or equivalent principle may be used and structural changes may be made as desired by those skilled in the art without departing from the present invention and the purview of the appended claims.

In the drawings:

Fig. l is a perspective view illustrating a preferred form of the new calendar edging;

Fig. 2 is a fragmentary perspective view of a pad of calendar sheets punched for the reception of the adhesively coated locking tabs or tongues embodied in the new calendar edging;

Fig. 3 is a fragmentary perspective view of a completed calendar embodying the present invention;

Fig. 4 is a fragmentary sectional view on line 4-4 in Fig. 3 andillustrating the manner in which the adhesively coated locking tabs are arranged in the new calendar;

Fig. 5 is a fragmentary sectional view on line 5--5 in Fig. 4;

Fig. 6 is a front elevational view of a preferred embodiment of the new machine for assembling the new calendar edging together with a pad of calendar sheets;

Fig. Tie a side elevational view of the new assembling machine shown in Fig. 6;

Fig. 8 is a sectional plan view on line 88 in Fig. 6;

Fig. 9 is an enlarged fragmentary detail view of parts of the operating mechanism embodied in the new assembling machine and illustrating one step in the operation of assembling the new calendar edging with a pad of calendar sheets;

Fig. 10 is a sectional detail view on line l0l0 in Fig, 9 illustrating the manner in which the adhesively coated locking tabs or tongues are pressed into effective position during-one step in the operation of the new assembling machine; and

Fig. 11 is a sectional view illustrating the parts 7 shown in Fig. 9 but showing the same in the position which they assume at the completion of the operation of assembling the new calendar.

A preferred and typical embodiment of the new calendar edging is shown in Fig. 1 of the drawings, wherein it is generally indicated at l5, and comprises an elongated strip of relatively heavy or still paperboard, made of suitable kraft or like paper stock, or other cellulosic or equivalent nonmetallic material, formed to provide a bottom wall IS, a top wall l1, and a rear wall [8.

In the form of the new calendar edging l5 which is illustrated in Fig. 1 the same is shown as being provided with a supporting tab or tongue I9 which is formed by die-cutting a centrally arranged portion of the bottom wall I5 of the calendar edging along three sides thereof, to provide a hinge connection between the tongue l9 and the bottom wall l6 of the new calendar edging, and then providing a hole in the tongue I9 50 as to enable the new calendar edging and a pad of calendar sheets held thereby to be suspended from a nail or other wall or like support. However, if desired, the supporting tongue |920 may be omitted entirely from the new calendar edging and the finished calendar suspended in any other suitable way.

As shown in Fig. l of the drawings, the entire inner surface of the new calendar edging is coated with a suitable adhesive 2| and for this purpose we have found a thermoplastic ureaformaldehyde resin adhesive to be well suited, and preferably the adhesive 2| is applied to the stock and allowed to dry before the calendar edging I5 is die cut from the stock.

As is also shown in Fig. 1, the bottom wall I6 of the new calendar edging is provided with a plurality of adhesively coated locking tongues 22 which are shown as being two in number although, of course, a greater (or lesser) number may be employed, if desired. Each of the adhesively coated locking tongues 22 is preferably formed by die cutting the same in the bottom wall I6 of the calendar edging simultaneously with the operation of die cutting the body of the calendar edging |5 itself so that each locking tongue 22 is hingedly connected to the body of the bottom wall I6 along one end thereof, as at 23,

while being severed from the body of the bottom wall 22 along three sides thereof, as shown.

One end portion of the pad of calendar sheets 25 is illustrated in Fig. 2 of the drawings and is shown .as being provided with a plurality of punched holes 24 which are shown as being two in number and as being spaced to correspond with the spacing of the adhesively coated locking tongues 22, it being understood that the number and spacing of the holes 24 will in all cases conform or correspond to the number and spacing of the locking tongues 22.

As shown in Figs. 4 and 5 of the drawings, when the new calendar is completed each of the adhesively coated locking tabs or tongues 22 is bent upwardly out of the holes or cut-out areas 26 in the bottom wall l6 of the calendar edging from which they are cut, and into the corresponding hole 24 in the calendar pad 25. It will also be noted that when the new calendar is completed the upper portion 22a of each of the looking tongues 22 is bent over the upper surface of the uppermost sheet in the pad of calendar sheets 25 and that the adhesive coating 2| on the upper surface of the end portion 22a of each of the locking tabs 22 is secured to the said uppermost sheet in the pad of calendar sheets 25 so as to retain the said pad of calendar sheets 25 together and in assembled relationship with the new calendar edging l5.

In addition to providing the new calendar edging l5 and the new calendar embodying the same, as thus described, the present invention contemplates the provision of a new and improved machine and method for assembling the new calendar edging IS with a pad of calendar sheets 25, to provide the new calendar, and said new machine and method will now be described.

A preferred embodiment of the new machine for assembling the new calendar edging with a pad of calendar sheets 25 is shown in Figs. 7 to 11, inclusive, of the drawings, and is there gem erally indicated at 21. The new assembling machine 2'! comprises a supporting frame 28 which includes a pair of upright supporting legs or posts 29 which are arranged upon a supporting base 30, said supporting legs or posts 29 being braced by means of upright braces 3| and cross braces 38.

A foot treadle 32 is pivotally mounted at its rear end, as at 33, upon the supporting base 30 of the new machine 21 and a pair of upright camoperating rods 34 are loosely connected at their lower ends, as at 35, to the foot treadle 32 (Fig. '7) The foot treadle 32 and the cam-operating rods 34 are urged into their normal raised position, as in Fig. 7, by means of a coil spring 36 the upper end of which is anchored, as at 31, to one of the upright frame legs or parts 29, this spring being attached at its lower end to the foot treadle 32 (Figs. 6 and '7). Each of the cam-operating rods 34 is swivelly mounted at its upper end, as at 39, upon a horizontally extending movable cam shaft 40 which is arranged at the top of the new assembling machine. A pair of cams 4| are attached to the movable cam shaft 40, one adjacent each end thereof, as at 66. Each of these cams 4| is also loosely mounted upon a horizontally extending stationary cam shaft 42 which is arranged at the top of the machine, parallel to the movable cam shaft 40. The stationary cam shaft 42 is journaled at its ends in a air of stationary bearing collars 43 each of which is mounted upon the upper end portion of a vertically extending stationary guide rod 44. These stationary guide rods 44 are mounted upon the horizontally extending upper rail 45 of the supporting frame 28 of the machine, as shown in Figs. 6, '7, 9 and 11.

A combination heating and pressure unit 46 is slidably mounted upon the two vertically extending stationary guide rods 44, this being accomplished by providing suitable apertures in the end portions of a pressure bar 4'! which is embodied in the combination heating and pressure unit 46 for the reception or passage of the guide rods 44. The combination heating and pressure unit 46 also embodies a pair of cam rollers 48 one of which is arranged at each end of the pressure bar 41, and each of the cams 4| has a bottom cam surface 49 which Works over one of the cam rollers 48 (Figs. 9 and 11).

The new assembling machine 21 also includes a stationary work-supporting table 50 which is mounted upon the two vertically extending stationary guiding and supporting rods 44, as shown in Figs. 6, '7, 9 and 11. A plurality of spaced vertically extending guide pins 52 are mounted in the body of the work-supporting table 50, adjacent the rear thereof, as shown in Figs. 9 and 11 and each of these guide pins 52 is adapted to project into and to work in a correspondingly shaped slot or openin 53 which is formed in the body of the pressure bar 47.

The combination heating and pressure unit 46 includes an electrical heating element 54 which is arranged at the rear of the pressure bar 4'! and this heating element 54 is enclosed in and by a suitable casing 55 which may be attached to the pressure bar 41 in any suitable manner. A corresponding heating element 56 is mounted upon the work-supporting table 50, at the rear thereof, and is enclosed in and by a casing 57 which may be attached, in any suitable manner to the body of the work-supporting table 50 at the rear thereof (Figs. 9 and 11). The heating elements 54 and 56 may be electrically connected to, in any suitable way, a source of electrical energy such as an electrical wall outlet.

A small horizontally projecting metallic supportin arm 58 is secured, in any suitable manner, as by welding, to the top of each of the stationary bearing elements 43 which are mounted on the upper ends of the vertical rods 44. One end of a coil spring 59 is attached to each of these supporting arms 58 and the other end of each of the coil springs 59 is attached to the movable pressure bar 41 at the rear thereof (Figs. 9 and 11) The body of the work-supporting table 56 is provided with a pair of spaced vertically extending openings 66 and a cylindrical pin 6| extends upwardly through each of these openings 66 with the upper end portion of each of the pins 6| projecting upwardly above the upper surface of the work table 56, as'shown in Figs. 9, 10 and 11. The lower end portion of each of the pins 6| is slidably mounted in an opening 65 formed in a horizontally extendin wall 63 of a supporting bracket and each of the supporting brackets 5| is attached to the worktable 50 at the bottom thereof (Figs. 9, and 11) Each of the pins 6| hasan annular flange or shoulder 52 formed thereon at a point below the bottom of the work table 55, and a coil spring 64 is arranged upon each of the pins 6| between the an nular flange or shoulder 62 and the horizontal wall 63 of the corresponding bracket 5|, these coil springs 64 normally urging the pins 6| upwardly.

Operation The use and operation of the new assembling machine are as follows: The apertured end portion of the pad of calendar sheets 25 may be inserted between the top wall l1 and the bottom wall l6 of the new calendar edging with the holes 24 in the calendar pad 25 disposed in registry with and above the locking tongues 22 in the calendar edging I5. Current to the heating elements 54 and 56 of the new assembling machine 21 may then be turned on and when the pressure bar 41 and the rear portion of the work table 50 are sufiiciently heated the assembled calendar edging |5 and calendar sheet pad 25 are placed upon the upper surface of the work table 53 with the two pairs of registered openings and locking tongues 2224-26 disposed in registration with the upper end portions of the pins 5|. The thus assembled calendar edgin l5 and calendar pad 25 may then be pressed downwardly over the upper end portions of the pins 6|. This causes the adhesively coated tongues 22 to be pushed upwardly through the holes 24 in the calendar pad 50 so that one end portion 22a of each of the locking tongues 22 projects angularly upwardly above the uppermost sheet in the calendar pad .25, as best'shown in Fig. 10.

With the parts thus disposed the foot treadle 32 may then be depressed, thereby pivoting the same clockwise, at 33 (Fig. 7), against the action of the resetting spring 36. This movement of the foot treadle 32 moves the cam-operating rods 34 downwardly and this movement of the cam-operating rods 34 acts to rock the two cams 4| about and relative to their supporting rod 42, from the position in which these parts are shown in Fig. 9 into the position in which they are shown in Fig. 11. During this movement of the cams 4| the lower or bottom cam surfaces 49 thereof ride over the cam rollers 48, which are carried by the pressure bar 41, thus forcing the pressure bar 41 downwardly upon the vertically extending guide rods 44. As the heated pressure bar 41 is thus lowered upon the guide rods 44 it is guided by and upon the vertically extending guide pins 52 which work in the correspondingly shaped openings 53 which are formed in the pressure bar 41. Accordingly, as the pressure bar 41 approaches its lowermost position, the bottom surface thereof engages the upper or top wall H of the calendar edging l5 and. as the pressure bar 41 continues to descend it forces the top wall I1 of the calendar edging downwardly, from the position in which it is shown in Figs. 9 and 10, into the position in which it is shown in Fig, 11, and this downward movement of the top wall H of the calendar edging |5 forces the upper end portion 22a of each of the locking tongues 22 downwardly into engagement with the uppermost sheet in the pad of calendar sheets 25. During this downward movement of the combination heating and pressure bar unit 46-41 the thermoplastic ureaformaldehyde resin adhesive coating 2| upon the inner surfaces of the top and bottom walls H and Hi, respectively, of the calendar edging |5 is softened by the heat imparted thereto by the unit 4641 and by the heated rear portion of the work table 56. Accordingly, as and when the unit 46-41 reaches the end of its downward stroke the adhesively coated inner or bottom surface of the top wall H of the calendar edging I5 is adhesively secured to the adhesively coated upper surface of the angled upper end portion 22a of each of the locking tongues 22 and to the top surface of the uppermost sheet in the pad of calendar sheets 25 while, at the same time, the downward pressure of the unit 46-41 forces the bottom sheet in the pad 25 into adhesive engagement with the adhesively coated upper surface of the bottom Wall l6 of the calendar edging l5, thus completing the assembly of the calendar edging l5 and the calendar pad 25.

As the unit 46-41 moves downwardly to complete the above-described operation the pressure exerted thereby upon the top wall H of the calendar edging l5 forces the pins 6| slightly downwardly, against the action of the springs 64, and when the unit 4641 is raised the springs 64 again urge the pins 6| upwardly into their normal raised position, as in Fig. 9.

Pressure upon the foot treadle 32 may then be released whereupon the then tensioned resetting spring 36 acts, through the foot treadle 32, to raise the cam-operating rods 34 from their lowered position, as in Fig. 11, into their normal or raised position, as in Fig. 9. This upward movement of the cam-operating rods 34 causes the cams 4| to move from their effective position, in which they are shown in Fig. 11, into their normal position in which they are shown in Fig. 9, and during this movement the rise 49a of the bottom cam surface 49 of each cam 4| rides the corresponding cam roller 48 and the dwell 49b of each cam surface 49 rides back into engagement with the corresponding cam roller 48. During this operation the then tensioned resetting springs 59 slidably raise the combination heating and pressure unit 46-41 upon the vertically extending guide rods 44 back into its normal and raised position, whereupon the foregoing cycle of operation may be repeated.

The thus completed calendar |1.-25 may then be lifted ofi from the pins 6| and removed from the work table 50.

It will be noted that when the new calendar 11-25 is thus completed each of the locking tabs 22 projects through one of the holes 24 in the pad of calendar sheets'25, as shown in Figs. 4 and 5, and thereby prevents the individual calendar sheet in the pad 25 from being unintentionally detached from the completed calendar |-25 while, at the same time, allowing the said individual calendar sheets to be readily torn from the completed calendar as and when desired.

Likewise it will be noted that since in the completed calendar the adhesively coated upper surface of the angled upper end portion 22:; of each locking tongue 22 is adhesively secured to the adhesively coatedunder surface of the top wall I! of the calendar edging IS the locking tabs or tongues 22 are thus effectively prevented from becoming dislodged from or pulled out of the holes 24 in the calendar pad 25.

The number of holes 24 in the calendar pad 25 and the corresponding number of locking tongues 22 may, of course, be varied, as desired, depending upon the size or width of the calendar, the weight of the sheets in the pad 25, and other variable factors.

It will thus be seen from the foregoing description, considered in conjunction with the accompanying drawings, that the present invention accomplishes its intended objects and has the desirable advantages and characteristics, including those which have been pointed out hereinbefore as well as others which are inherent in the invention.

While we have illustrated and described preferred forms of our invention, it is to be understood that these are capable of variation and modification and we, therefore, do not wish to be limited to the precise details set forth but desire to avail ourselves of such changes and alterations as fall within the scope of the following claims:

We claim:

1. A calendar edging comprising a body of relatively stifi paper or like cellulosic material including a top wall and a bottom wall and a rear wall interconnecting the said top and bottom walls, the bottom surface of said top wall and the upper surface of the said bottom wall being provided with a coating of thermoplastic adhesive material and the said bottom wall having a locking tongue formed therein and integrally connected thereto, the said locking tongue being provided on its upper surface with a coating of said thermoplastic adhesive material and being adapted to be projected into and through a hole formed in a pad of calendar sheets having a marginal edge portion disposed between the said top and bottom walls of said calenda edging with the said adhesive coating on its upper surface adhesively secured to the under surface of said top wall so as to secure the said top and bottom walls of said calendar edging together and to the said marginal portion a pad of calendar sheets disposed there etween, the said bottom wall of the said calendar edging having a supporting tongue formed therein substantially midway between the ends of the said bottom wall, the said supporting tongue extending and being movable transversely relative to the long axis of the said calendar edging and the said locking tongues extending and being movable lengthwise relative to the long axis of the said calendar edging.

2. A calendar comprising a pad of calendar sheets, a calendar edging formed from a body or paper or like material and including a topwall, a bottom wall and a rear Wall interconnecting said top and bottom walls, said pad of calendar sheets including an end por i i pose between the said top and bottom walls of said calendar edging and the said end portion of said calendar pad having a hole extending therethroug'h, the said bottom wall of the said calendar edging having a locking tongue formed integrally there'- with and the inner surface of the said top and bottom walls of said calendar edging having a coating of adhesive material thereon and the said top and bottom walls of said calendar edging being secured by the said adhesive coating thereon to the top and bottom sheets, respectively, in the said pad of calendar sheets, and the said locking tongue including a portion extending through the said hole in the said end portion of the said pad of calendar sheets, and the said locking tongue including an angled end portion extending over the top surface of theuppermost one of the said sheets in the said pad of calendar sheets and the upper surface of the said angled end portion of said locking tongue being adhesively secured to the lower surface of the said top wall of said calendar edging.

3. A calendar as defined in claim 2 in which the said end portion of the said pad of calendar sheets has a plurality of holes formed therein and in which the said bottom wall of the said calendar edging has a plurality of the said locking tongues formed therein and in which each of the said locking tongues-includes a portion projecting through one of the said holes in the said end portion of the said pad of calendar sheets and in which each of the said locking tongues includes an angled end portion extending over the top surface of the uppermost one of the said calendar sheets and in which the said angled end portion of each of said locking tongues is adhesively secured to the lower surface of the said top wall of said calendar edging.

4. A calendar as defined in claim 2 in which the said end portion of the said calendar pad has a plurality of holes formed therein and in which the said bottom wall of the said calendar edging has a plurality of the said locking tongues formed therein and in which each of the said locking tongues includes a portion projecting through one of the said holes in the said end portion of the said pad of calendar sheets and in which each of the said locking tongues includes an angled end portion extending over the top of each of said locking tongues is adhesively secured to the lower surface of the said top wall of said calendar edging, and in which calendar the said locking tongues are elongated and in which each of the said locking tongues has its long axis extending parallel to the long axis of the said calendar edging.

5. The method of making a calendar which comprises forming a calendar edging of paper or like cellulosic material to provide a top wall and a bottom wall on the said calendar edging and a back wall extending between the said top and bottom walls, coating the inner surfaces of the said top and bottom walls of the said calendar edging with a thermoplastic adhesive material, forming a locking tongue in and integrally with the said bottom wall of the said calendar edging, forming a hole ina marginal end portion of a pad of calendar sheets, inserting the said marginal end portion of said pad of calendar sheets between the said top and bottom walls of said calendar edging with the said hole therein in registry with the said locking tongue, inserting the said locking tongue through the said hole in the said marginal end portion of said pad of calendar sheets With an end portion of said looking tongue projecting ove the top of the uppermost one of the said sheets in the said pad of calendar sheets and between the said uppermost one of the said sheets and the inner surface of the top wall of said calendar edging, and then subjecting the said calendar edging, with the said marginal end portion of said pad of calendar sheets disposed therebetween, to heat and pressure to soften the said thermoplastic adhesive on the inner surfaces of the said top and bottom walls of said calendar edging and to force the same into engagement with the said marginal edge portion of the uppermost and lowermost sheets in the said pad of calendar sheets while, at the same time, securing the said adhesively coated surface of said locking tongue to the adhesively coated inner surface of the top Wall of said calendar edging.

6. The method of making a calendar as defined in claim which includes providing a plurality of holes in the said marginal end portion of the said pad of calendar sheets, forming a pluralit of locking tongues, equal to the number of the said holes, in and integrally with the bottom Wall of the said calendar edging, inserting one of the said locking tongues into each of the said holes with an end portion thereof extending over the top of the uppermost one of the said sheets in the said pad of calendar sheets, and then securing the adhesively coated upper surface of the said end portion of each of the said locking tongues to the adhesively coated bottom surface of the said top wall of the said calendar edging during the operation of subjecting the said calendar edging to heat and pressure.

7. An apparatus for assembling the marginal edge portion of a pad of calendar sheets having a hole extending therethrough with a calendar edging composed of paper or like material and including a, top wall and a bottom wall each coated on its inner surface with a thermoplastic adhesive and the said bottom wall having a locking tongue formed integrally therewith and provided on its upper surface with a coating of said thermoplastic adhesive material: the said apparatus comprising an upright supporting frame, a horizontally extending work-table carried by the said supporting frame and adapted to support one of the said calendar pads and one of the said calendar edgings with the said marginal edge portion of the said calendar pad disposed between the top and bottom walls of said calendar edging and with the said locking tongue in said bottom wall of said calendar edging disposed in registry with the said hole in the said marginal edge portion of said calendar pad, means for forcing the said locking tongue upwardly through the said hole in the said marginal edge portion of said pad of calendar sheets and for projecting an end portion of the said locking tongue over the marginal edge portion of the uppermost one of said calendar sheets in the said pad of the same, means for heating the said calendar edging so as to soften the said thermoplastic adhesive coating on the inner surfaces of the said top and bottom I Walls thereof and on the upper surface of said locking tongue, and means for applying pressure upon the said calendar edging and upon the said marginal edge portion of said pad of calendar sheets disposed therebetween simultaneously with the application of heat thereto by the. said heating means so' as to force the adhesively coated inner surfaces of the said top and bottom walls of said calendar edging into engagement with the said marginal edge portions of the uppermost and lowermost sheets in said calendar pad and so as to force the adhesively coated inner surface of said top wall of said calendar edging into adhesive engagement with the adhesively coated upper surface of the said end portion of said adhesively coated locking tongue.

8. An apparatus as defined in claim 7 which includes a plurality of said locking tongue forcing means for simultaneously forcing a plurality of said locking tongues formed in the bottom wall of one of said calendar edgings through a corresponding number of holes formed in the said marginal edge portion of one of said calendar pads.

JOSEPH L. PRUNEAU. JAMES MULLALLY. JAMES F. HANRAHAN.

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