USRE11838E - Pottery-ware - Google Patents

Description

No. ",838. v Reissued July 3, I900 A. R. GRUTZ.

MOLD FOR PBESSED GLASSWARE AND'POTTERY WARE.

(Application filed Dec. 15, 1899.1

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MOLD FOR PRESSED GLASSWARE AND POTTERY WARE (Applicltion filed Dec. 15. 1899.1

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UNITED STATES PATENT OFFICE.

ALBERT R; GROTZ, OF LAZEARVILL E, WEST VIRGINIA.

MOLD FOR PRESSED GLASSWAR-E'AND POTTERY-WARE.

SYEQIFICATION forming part of Reissued Letters Patent No. 1 1,838, dated July 3, 1900. Griginal No. 636,795, dated November 14,1899. Application for reissue filed December 15, 1899. -Serial No. 740,452.

To all whom, it puny concern:

Be it known that I, ALBERT R. Green, a citizen of the United States, residing at La zearville, in the county of Brooke and State of West Virginia, have invented certain new and useful Improvements in Molds for Pressed Glassware and Pottery- Ware; and I do hereby declare the following to be a full, clear, and

. exact description of the invention, such as will enable others skilled in theart towhich' it appertains to make and use the same.

This invention relates to molds for pressed glassware, pottery-ware, or plastic compositions, either of the open-and-shut type or the block variety, according to the grade or qual ity of the articles to be molded and whether the articlesareto be seamless or not. The primary object of the invention is the provision of a mold which will enable two or more articles being pressed at the same time, the plungers being so mounted as to yield and equalize the pressure and insure perfect work even though the material is a little .over or a trifle short of the required amount. Without this provision imperfect work would result, as it is practically impossible to sup ply the cavities of th'e mold with the exact quantity of material each time, and the article pressed from the material short of the required amount would be incomplete if the plungers were rigidly connected; but by having the plungers loosely connected they can adapt themselves to variations in the quantity of material in each cavity of the mold and distribute the pressure equally upon each.

The improvement consists, essentially, of the novel features, details of construction, and'combinationsof parts, which will be more particularly outlined in the appended claims.

The invention; is --applicable "to different constructed in accordance with the invention,

the pressing mechanism being omitted. Fig.

- 2 is a longitudinal section showing the relation of the parts when the plungers have been forced into the mold-cavities to shape the material placed therein. Fig. 3 is a plan section. Fig. 4: is a detail view of the. base. Fig. 5 is a detail view in perspective of a side section ofthe open-and-sh ut mold. Fig. 6 is an end view of the pressing mechanism. Fig. 7 is a detail View of a block-mold, the parts being separated and disposed in a group.

Corresponding and like parts are referred to in the following description and indicated in all the views of the drawings by the same reference characters. The mold proper comprises a base 1, a sectional body composed of endpieces 2 and side pieces il, and acenibinedcap-and guidei plate at, the latter being removably fitted to the body of the mold after the sections thereof have been brought into proper relation.

The base is provided upon its top side with bosses or projections 5 and 6, which are preferably of circular outline and have their edges undercut, so as to interlock positively with the sections of the-mold-body and hold,

the latterand base in proper position when forming the articles by the application of force to expanding plungers. The component parts of the mold-body are formed in their lowerfaces with depressions 7,which unitedly form a seat to receive the respective bosses or projections 5 and 6.- The bosses may serve as a portion of the molding-surface of the cavity in which the material is shaped and formed under pressure. This is. plainly shown at the right-hand side of Fig. 2, in which the top side of the boss is illustrated'as constituting the bottom of the mold-cavity.

The mold sections or parts are hollow, the spaces opening through the bottom sides of the sections and being closed by means of the base-plate 1. Openings 8 are formed in the end walls of the mold-sections in coincident relation,whereby the spaces or chambers inter: communicate, so as to establish and maintain a circulation of hot air or flame through the entire body of the mold when the latter is in active operation, thereby preventing chilling of the material to be shaped. The mold-sections are connected by hinge-joints in the usual way and are united by miter-joints, whereby the sections are enabled to readily open and close. Handles 9 and 10 are applied to adjacent sections of the mold-body and are grasped when it is required to open or close the mold. The separable or parting sections are connected and forcibly brought together by means of a pin 11, which passes through registering openings formed in the lugs 12, projecting from the terminals of said turning it in the lugs to effect a drawing of the mold-sections together. Burners 15 are fitted to the side pieces or sections of the mold-body and are connected by flexible tubing with a suitable source of gas-supply, and these burners are provided with valves 16,

by means of which the flow of gas to the burners may be regulated or entirely cut oil. The mold is provided with a series of cavities corresponding in shape to the configuration of the article tobe formed. A rabbet or shaped is formed.

21 are of sufficient extent to insure centering cap-plate in line with the mold-cavities and are adapted to receive the plungers 22 and direct them in their vertical movements, and more particularly when advanced to expand the glass or plastic material placed in the mold-cavity and from which the article to be The walls of the openings and maintaining the plungers-in proper position during their forward movement when in active operation. These walls are reduced intermediate of their upper and lower ends to form spaces 23, surrounding the plungers, thereby reducing the extent of frictional surface between the parts. The size and shape of the openings 21 will depend upon the extent and form of the receiving ends of the mold-cavities, as will be readily understood. The plunger-head 24 has its lower end reduced, as shown at 25, and the shoulders formed at the base of the reduced end 25 inclineoppositely from acentral point to admit of the eross-head26 having a limited rocking movement. The plunger-head 24 is adapted to have the force applied expanded for advancing the plungers, so as to compress and cause the plastic material to fill every portion of the mold-cavities.

, The cross-head 26 is formed upon its top side with parallel ears 27, between which is received the reducedend 25 of the plungerhead, a transverse pivot-fastening 28 connecting the plunger-head and cross-head by being passed through registering openings formed in the parts 25 an'ii 27. The upper edges of the cars 27 are straight and come opposite the shoulders 29, formed atthe base of the reduced end 25 and oppositely inclined,

as set forth. The lower end of the reduced part 25 is curvedlongitudinally, so as to admit of the cross-head rocking upon the pivotfastening 28. The plungers'22 are loosely secured directly with the terminal portions of the cross-head 26 by means of fastenings 30, which are headed at their upper ends and have their lower ends threaded and fitted into openings formed centrally of the plungers. The openings in the ends of the cross-head are snfliciently large to admit of the plungers havinga movement in every direction to adapt themselves to the guide-openings of the capplate 19 and to variations in the quantity of material placed in the mold-cavities. shown, the plungers slope from a central point downwardly toward their sides, whereby provision is had for the relative movement between the plungers and cross-head. A fulcrum-pin 31 is located centrally of the cap-plate 19 and projects vertically therefrom, and its upper end is made tapering and enters a depression or cavity formed centrallyin the lower face of the cross-head 26. Inasmuch as the force applied to the plungerhead is transmitted to the plungers through the cross-head 26 and fulcrum-pin 31, it is obvious that the said cross-head is adapted to turn or rocknpon the fulcrum-pin, thereby equalizing the pressure applied to the plungers for forcing the material to all parts of the mold-cavities and resulting in subjecting said material in the mold-cavities to a I like degree of pressure, whereby perfect articles are formed.

The mold herein described is of the openand-shut type, and the articles formed are provided with fins upon their outer surfaces corresponding to the joints between the several sections of the mold. In the form of mold shown in Fig. 7 the sectional body forms the feet, knobs, or other projecting parts of the articles, the body portion of said articles being formed in the block 32, which is removably fitted in a seat formed in the top side of the mold-body when the sections are united. A cap-plate 33 is in turn fitted within a seat formed in the upper side of the block and corresponds to the guide or cap plate 19 and is provided with openings through which the plungers work. The articles shaped in this form of mold are seamless, with the except-ion of the head and feet, which latter, being formed in the sectional body of the mold, have seams corresponding with the joints between the several sections. In all other essential particulars the block is substantially the same as the open-and-shutmold and is heate and operated in the same manner. v The fulcrum-pin 31, in addition to the function of forming a support for the cross-head 26 to tilt upon, also centralizes the parts 26 and 19, whereby the'plungers 22 are properly positioned 'when applying pressure thereto.

When the mold is used for pressing potteryware, the heat resulting from the circulation of flame, hot air, or other medium dispels all moisture and prevents sweating and a sticking of the ware 'n the mold when formed.

Having thus escribed the invention, what is claimed as new is i 1. A mold havinga plurality of mold-cavities,a vertically-disposed f ulcrum-pin located about medially of the'mold-cavities, a crosshead mounted upon the upper end of the fulcrum-pin to tilt in any loosely connected with the cross-head and adapted to cooperate with the mold-cavities, and means for applying pressure to the crosshead in vertical line with the fulcrum-pin substantially as set forth.

2. In combination with a mold having moldcavities, a cross-head mounted to rock, plungers located upon opposite sides of the fulcrum of the said cross-head and having their top sides sloping from a central point in all directions, and a vertical pivotal connection between the cross-head and plungers, sub-. stantially as set forth.

3. In combination with a mold having moldcavities, and a cap-plate applied to the top side of the mold and formed with guide-openings, plungers adapted to work through the guide-openings of the cap-plate, a cross-head carrying the plungers and mounted upon a fulcrum-pin applied to the cap-plate, and a plunger-head pivotally connected with the cross-head, substantially as set forth.

direction, plungers,

4. In combination,a mold having mold-cavities,a cross-head bearing plunger-s and mount ed to rock, and having spaced ears upon its top side, and a plunger-head having its lower mold having a plurality of mold-cavities, a

plunger-head, a cross -head pivoted to the plunger-head and adapted to rock, and plunge'rs for the molds individually secured direetly by universal joints with the cross-head; substantially as described.

7. The combination of a mold having a plurality of mold-cavities, a plunger-head, a cross-head pivoted to the plunger-head and adapted to rock, and plungers 'for the molds individually secured directly to the crosshead by connections arranged to allow uni-- versal rocking of the plungers relatively thereto; substantially as described.

. In testimony whereof I afiix my signature in presence of two Witnesses.

ALBERT n. eno'rz. Witnesses:

THOMAS W. BAKEWELL, H. M. OoRwrN.

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