US1749855A - Means and method for making printers' metal furniture - Google Patents

Description

March 11, 1930.

A. G. sTEvENsoN. ;j 1,749,855

MEANS AND METHOD FOB. MAKING PRINTERS METAL FURNITURE I Filed Oct. 8, 1928 3 Sheets-Sheet March 11, 1930. A. G. sTEvENsoN 1,749,855

v MEANS AND METHOD FOR MAKING PRINTERS METAL FURNITURE Filed ont; 8, 192e s sheets-sheet 2 lQ/ l March 11, 1930. A. G. sTEvENsoN 1,749,855

` MEANS AND METHOD EOR MAKING PRINTERS METAL FURNITURE "Filed oct. s, 192e s sheets-sheet s 5 g W ,nnnfin Patented Mar. l1, 1930 ASHTON G. STEVENSON, E CHICAGO, ILLINOIS MEANS AND METHOD FOR MAKING PRINTERS METAL FURNITURE Application led October 8, 1928. Serial No. 311,183.

My invention relates to printers? metal furniture and means and methods of producing same.

Thispresent invention is an improvement @on the invention of a slug or furniture mold as disclosed in U. S. Patent No. 1,260,828 issued to me March 26, 1918. Themold disclosed in said patent was particularly devised for use'on a lino-type or similar type casting lumachine for making relatively thick slugs for use as type furniture or base material and carried a core whereby such slugs were made hollow for reducing their weight and making more solid castings. Such a mold lwas made with parallel faces forming the top and bottom of the mold and it was discovered, in use, that the slugs cast in such molds did not have perfectly parallel side faces but were slightly thinner in thickness 2li-Tat their middle portions than at their ends,

caused by shrinkage. Such shrinkage is more pronounced at the bottom edges of the slugs than at the tops, the tops of the slugs being substantially of uniform width throughout 2"their length. Consequently, when these slugs were used of full or em length such variationl in thickness was notV detrimental, but

such slugs, though produced of standard 30 em length, are frequently cut to shorter 30lengths and if they were cut to 15 em length by being cut in two halfway between their ends, one end of the short slugs thus produced would have slightly inclined sides and would not lock up properly but would tend -to cause the form to bulge up under the locking pressure.

In considering ways and means for correcting this inaccuracy which, although only a A0 Vfew thousandths in eXtent,`was suflicient to 'cause trouble in locking up some forms, I

made use of many expedients, but none were successful until I devised my present method.

My invention will be more readily under- V stood by reference to the accompanying drawings forming part'of this specification and in which Fig. 1 is a yperspective view of one of my improved slugs or piece of'type furniture;

Eig. 2=is a frontview of one of my'improved molds used for making my slug,-

improved of Fig. 4;

Figs. 6 and 7 are vertical cross sectional views on the lines of Fig.v 4;

6 6 and 7 7, respectively,

Fig. 8 is a front elevational view of a iig used for producing my improved molds Fig.

the lower part of one'of i 9 is, a horizontal sectionv on the line Figs. 10 and 11 are vertical, sectional views Fig. 12fis afperspective viewof the of the mold particul off portion; and

on the lines 10'-'10 and 11-11, respectively,

b cap part arly showlng the ground Fig. 13 is a vertical central cross-section of a mold without my improvement.

In said drawings improved slugs mad l illustrates one of my e in one of my improved moldsv and havingrparallel fiat side faces 2, as shownat 3. The slug 1 is preferably made hollow on its under side and has a top flat surface 4. The side faces 2 of the slug are the sides which it ha sible to make absolutely and success has only s apparently been imposr parallel heretofore, been attained by means of my improved mold.

The dottedy line 5 ordinary discrepancy,

on F ig. l indicates the though greatly exaggerated, yof a slugfmade in my molds before I improved them, and `5 indicates the areaV ancy.

,the dotted curved line or extent of the discrep- The mold 6, as shown in Fig. 2, consists of a cap7 and a Between the cap 6 base 8 which are substantially the same as the usual for'use on lino-type cap and base of molds mold wheels 9, Fig. 3. and base 8 is arranged tov form a mold op ening 12. In the form the cap been hardened and the bottom surface 16 of accurately ground and hnshown, the liner or core has an intermediate part or bar 13 connecting the two end spacer parts and extending longitudinally through the mold opening. rIhis is for the purpose of making the slug hollow and lighter. T his bar divides the mold opening longitudinally and provides two slots 14 and 15 at the rear through one of which the metal is forced in the process of casting a slug. I Y Y The under side surface 16 of the cap and the top surface 17 of the base are the surfaces which produce the side faces 2 of the slug.

For the purpose of overcoming the fault or detriment of the slug beingthinner at its rear middle portion than at its ends', as indicated in Fig. 1 by the dotted lines 5-5, I so form the bottom surface 16 of the cap and thel top surface 17 of the base that when assembled for use the mold space 12 is wider vertically at its rear middle portion than at its ends.

In Figs. 4 to 7, inclusive, I have shown means for making the under surface 16 of thev cap the shape or form desired. For this purposeI provide a jig 18 which consists of a bar of metal having a'longitudinal slot 19 in its upper side for receiving one of the caps with its lower face 16 turned upwardly. The top surface 20 of the jig is flat except for cross bars 21 which are secured upon its two ends by screws 22. These cross bars are flat on their under surfaces and rest flat down upon the top surface 20 of the body of the jig, and consequently their undersides Ywhich span the slot 19deiine the top of the slot 19. The ends 23 of the cap 5 are arranged beneath the cross bars 21 and they cap is forced tightly up against vthese cross bars by a screw 24 mounted at the middle of the length Aof the bar and under the rear part of the cap and the upper Vend of which is adapted to contact with the middle of the top of the cap 7 Y In preparation for the step to be described has beensubstantially finished, it has the cap 7 has been ished to a perfectly flat condition so that when the cap is placed in the jig, upside down,

and the screw 24 is turned to set the ends of thel cap firmly against the under sides of end stops 21 the surface 16 of the cap lies Hush and Veven with and this springs or curves the cap upwardly,

. forcing'its middle portion above itsends, as f indicated by the full line in Fig. 5. It is obtween the solid line in Fig. 5 and the dotted the top surface of the jig.- l'Ihen the screw 24 is turned in a little more edge than at the front edge, resulting in the crescent shaped surface shown shaded in Fig. 4. Y

yIhis setting of the jig can be accomplished either by making the bottom of the jig on a slight incline or by laying a shim of the proper thickness under the front edge thereof in setting the jig in a grinding machine.

After the cap has been ground as described, it is released from the jig and it resumes.

natural condition. `i/Vhen released it naturally springs back to its original condition, and the rear middle portion having been removed by grinding the surface 16 of the-moldsurface of the cap is slightly curved from end to end. Forthe purpose of ease of manipula- 'Y tion the slot 19 in the jig 18y is made slightly wider than the eXtreme width of the capand the cap is forced sidewise inthe slot against one side wall by horizontal screws 26.V These Y screws are tightened before the grinding step is begun so that the cap is held rmly during the grinding. l

The base 8 is treated Vin a similarmanner; in other words, it is also hollow ground. yFor this ypurpose a jig 27 ispro'vided consisting of a block 28 cut away'on one Vside to provide an upstanding wall 29 at one side with an inner flat vertical `face 3Q against which the base 8 is adapted to be firmly clamped by va centrally disposed screw 31 which fits in a suitable threaded opening providedin acentrally located boss 32.V This boss constitutesthe head'of a bolt 33 which projects through the wall 29 andis clamped tightly in position by v a nut 24 on its opposite end'. The boss 82 serves as a support for the base 8, as the base is provided with anv opening 35 in which the boss fits freely. The screw, 31-holds the base tightly against the inner fiat vertical face 30 of the wall 29 by means of a longitudinally arranged clamping bar 3,6 which bears at its end portions against the adjacent side of the base.

For springing the base 8 so that` its middle portion can be ground off to makeit hollow when released, I provide two pull-down screws 37, one at each end, eachof which li'i projects up through an opening in the base of the jig, the. heads of the screwsbeingY shouldered in the base and their threaded upper ends engaging pull members 38, each ofv which has a horizontal projection 39 adapted to enter an opening in the base 8 near its end.

It isnow clear that when the base 8 has been clamped vfirmly inV place bythe screw 31'and is supported by the boss 32, the ends of the base 8 can be drawn down by turning the screws 37 in the right direction. The dotted line 40 in Fig. 8 indicates the top of the base before it is sprung, and the full line indicates its top after it is curved. As before, this difference is very greatly exaggerated. Having sprung the base as described, the portion beyond the plate is ground off as before, and when the base is released it assumes its fornier conditions with this dierence-that it is curved downwardly in its middle portion; in other words, it is slightly hollow ground from end to end. As with the cap, the jig is slightly tipped so that more is taken off the rea-r edge than the forward edge. Care is taken in each instance not to extend the grinding beyond the shaded area 16 rshown in Fig. 12. l

For guiding the cap in its relation to the base, rigid upstanding guide projections 4l are provided at the ends of the base 8, and the cap is provided with notches 42 at its end to receive these projections. But during the grinding operation on the base, these projections a-re removed, as indicated by the dotted lines in Fig. 8.

Having ground the cap and the base, the mold is assembled and the mold slot presented is wider at its rear middle portion than at its ends and is gradually tapered from its largest dimension of its center toward its ends and toward the front. Consequently, as the metal is forced into the mold slot in the usual process of casting slugs on a linotype or similar machine, the casting will be thicker vertically of the slot at its rear middle portion than at its ends, but as the slug cools it will shrink vertically of the mold slot; that is, traversely of the slug to a greater extent at its rear middle portion than at its ends, and this shrinkage is exactly compensated for by the shape of the mold produced as described.

As many modifications of my invention will readily suggest themselves to one skilled in the art, I do not limit or confine my invention to the specific details of construction or steps of operation herein described.

I claim:

l. The herein described improvement in metal molds for producing hollow type furniture or base material having parallel side faces, which consists in making the mold slot wider at its rear middle portion than at its ends.

2. The herein described improvement in metal molds for producing hollow type furniture or base material having parallel side faces, which consists in widening the mold slot from both ends toward the middle and from its front side toward its rear side.

3. A metal mold for use in casting hollow type furniture or base material, said mold having a slot which is tapered in width from both ends towards the middle thereof and from the front toward the rear, a longitudinal core in the mold slot, the Widening of the slot being just sufficient so that the slugs when cast have parallel side faces.

4. A metal mold for use in casting type slugs for use as furniture or base material, the mold having a mold slot defined at one side by a cap and at the other by a base, means for spacing the cap and base apart, a core arranged in the slot for making the slugs hollow, both the cap and the base being hollow ground as described for the purpose specilied.

5. A metal mold for use in casting hollow type slugs for use as furniture or base Inaterial, having parallel side faces, the mold having a slot in which the furniture is cast, the slot being slightly wider at its rear middle portion than at its ends, the two opposite faces of the mold defining its width being each inclined from its middle portion y toward each end and from its rear face to its front face.

6. The herein described method of making caps and bases for printers metal slug molds, which consists in first making the caps and bases substantially completely finished except their opposed faces, the parts having been previously hardened, then applying pressure to each part in such a manner as to force its face which is to be opposed to the other part to bulge at its middle rear portion, then grinding off such bulging portions whereby when said cap and base are released and assembled to form a mold the mold slot is wider at its middle rear portion than at its ends.

7. A metal mold for use in casting hollow type furniture, themold having aslot which 1s wider at the middle portion of its rear a side and which tapers toward the middle of the front edge and toward its ends.

8. A metal mold for use in casting hollow type furniture, defined at one side by a cap and at the opposite side by a base, the cap and base each being hollow ground at their rear edges, the grinding gradually lessening toward the frontand disappearing at substantially the middle of the front edges of the two members and extending from the middle of the piece toward each end.

In testimony whereof, I have hereunto set my hand, this 18th day of September,

ASHTON G. STEVENSON.

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