US952684A - Apparatus for making tapering plastic forms. - Google Patents

Description

G. P. PBMBERTON. APPARATUSFOR MAKING TAPERING PLASTIC FORMS.

AIPLIOATION FILED 00T. 21. 1909.

Patented Mar. 22, 1910.

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WITNESSES" ears Armar REIG.

GEORGE F. PEMBERTON, OF LINCOLN, CALIFORNIA.

APPARATUS FOR TAPERING PLASTIC FORMS.

Specification of Letters Patent.

Patented Mar. 22, 191e.

Application filed October 21, 1909. Serial No. 523,751.

that they may be telescoped one into the other.

It consists in the combination of parts and details of construct-ion which. will be more fully explained by reference to the aecompanying drawings, in which- Figure 1 is a front elevation of the invention. Fig. 2 is a vertical section. Fig. 3 is a cross sect-ion on the line m-m Fig. 2. vFig 4 is a diagrammatic view showing the in vention as applied. Fig. 5 -is a plan of the cutting wheel.

My invention is especially designed vfor the manufacture of circular, elliptical, polygv onal, quadrilateral, or other tubes, which are tapered from end to end, and are especially designed for the ultimate formation of segmental tileswhich are made tapering, s o that they may be telescoped or laid in over lapping series.

In the drawings, A is a clay cylinder such as is used in ordinary clay-pressing machinery, and provided witha pressing piston 2 connected with asteam cylinder 8 in the usual manner. l

Secured to the annular flange on the lower end of the cylinder A, is an inwardly converging ring orsection 4, havingl its inner periphery at the top coinciding with the inner surface oi the cylinder' A, and its inner periphery at the bottom adapted to fit thesinner edge of a. hollow tapering shell 5.

The upper end of the shell 5 is provided with an annular flange (i, on the upper face of which vis formed a ridge 7 adapted to coincide or register with a corresponding groove or channel on the under edge of the convergent ring 4, for the purpose of insuring an exact juncture of the inner surfaces of the members 4 and 5.

A movable ring 8 is mounted on the lshell 5 beneath the flange G, and is held in place and supported by means of a collar E) secured to the shell 5. Rigidly secured to the movable ring 8, are dogs or hooks 10 which are adapted to be engaged with lugs 11 on the section 4, so asl to securely clamp and sustain the shell 5 in close contact with the section 4. A handle 12 is secured to the ring 8, by means of which the ring may be moved from side to side so as to engage or disen' gage the dogs or hooks 10 from the lugs 11.

Extending upwardlywithin the cylinder A is an inner cylinder 13 which is supported upon and connected with the converging ring 4. Legs 14 are. formed at intervals around the cylinder 13, and set in pockets in the ring 4, and are secured therein by bolts 15. -The upper end of the cylinder 13 is closed by a head-or cap 16 threaded thereon.

A tubular shaft 17 connects with the cap 16 i and extends upward through the pressing piston 2, terminating at a point near the steam cylinder 3, as shown in Fig. The lower end of the-cylinder 13 is provided with a iiange or shoulder 18 on its inner periphery, and is tapered on its outer surface to correspond with the inner surface of the section 4, thus forming a narrow converging annular passage 19 between thecylinder 13 and the section 4.

2() is a tapered core, which 'forms the inner portion of the mold, and is tapered to correspond with the outer shell 5, and with a sufficient distance between its outer surface and the inner surface of the shell. to allow the introduction of plastic material to make a product of the desired thickness and shape. The upper end of the core 2O is closed, and fits within the inner cylinder 13., and is provided with a flange 21 which is adapted to rest upon the shoulder 1.8 to limit the downward movement of the core. The lower end of the core 20 is designed to fit over an upwardly extending tapered pin 22 when in its lower-most position. The centering pin 22 is centrally mounted in the end of a vertical shaft23 which is'secured to the lower end of the shell 5 by means of'a disk 24 and brackets 25.

A handle 26 is attached to a stem 27,

- which projects below the mold. The cutter consists of outer and inner rings 307-30, with wires 31 radially extending from one to the other across the lower opening of the mold. Thecutting wheel connects with the handle 26, so that as the latter is moved side-v wise to release the clamp 29, the wheel 30 vmoves therewith around the pin 22,' the wires 3l severing the material projecting 'below the mold.

The core 20 isdrawn up into the cylinder 13 by means of a' cable 32 which passes through the shaft 17, and is wound around a drum 33 by a hand-wheel 34.

In operation, the materials of which the l tile or other products are t'o be formed, are introduced into the clay cylinder A, b low the pressing piston 2 in any suitable ma ner common to the art. Downward movement of the pressing piston v2,-forlces the plastic substance through the passage 19 into the space between the shell 5 and -core 20, the parts being in the position'shown in full lines in'Fig. 2; Continued pressure fills the mold, which is indicated by the oozing of the material out through the bottom. The piston 2 is then stop ed, and the lever 26 moved .so as to une amp the core 20, and

I s remove the surplus material on the end of the mold as before described. The clamps 10 arethen released from the lugs 1l, by thc handle 12, which allows the shell 5 to dro downward with the counterweighted sha t 23, as shown in dotted lines, whichgis operated by ahand-wheel 35 in the usual manner. The core 20 is simultaneously drawnV upward into the cylinder 13 as before described, leaving the article suspended lby its own' adherent strength, from the mouth of 'the passage l9 to be readily removed and afterward dried, baked, and burned, in the usual manner for forming pottery ware. The mold in this case is shown as circular in cross section, however it is obvious that any other form desired can'be'employed, in which case the section 4 would converge from a circular inner periphery at its top, to such form at its bottom edge as would correspond with the mold below.

As the tapering cast is designed to be separated or divided in halves lengthwise, 4to form tiles, proj ectin rid es 36 are formed upon the-opposite si es o the interior of the louter shell as shown in Fig. These ridges form indentations in the material of such depth that the complete tubular casts may be readily separated.

esaeea Having thus described my invention, what c I claim and desire lto secure by LcttersPat- .attached to the lower end of the cylinder, a

tapering mold shell removably connected with said section, an inner cylinder concentric with the outerone, having a convergent lange forming with the convergent section an annular passage to the mold shell, and a tapering concentric core within the mold shell.

2. The combination in an apparatus for making plastic forms, of a compression cylinder and plunger, a convergent section having a flange andmeans to secure it to the bottom flange of the cylinder', an inner concentric cylinder with downwardly divergent legs, means to secure the legs to the upper part of the convergent section, a tapering core supported and dependent from the 'inner cylinder, and' a mold sh'ell detachably supported from the convergent section.

3. The combination in an apparatus for making plastic forms, of a compression cyl- -inder and plunger, an annular convergent section secured tothe open lower end of the cylinder, an inner concentric cylinder having a convergent ange at the lower end, forming with the convergent section, a directing channel, a tapering core suspended from the inner cylinder, a mold shell concentrically inclosing the core, and disengaging locking devices uniting the shell to the convergent section'.

4. The combination in an apparatus for making plastic forms, of concentric cylinders, and a compression plunger movable in the outer one, a convergent section dependent from the outer cylinder and a tapering mold core from the inner one, a mold shell concentric with the core, having a flange with an annular ridge, a corresponding grooved flange at the bottom of the convergent section with which the mold shell ridge registers, interlocking lugs and. hooks upon the section and the mold shell, and a lever by which they may be engaged or-disengaged. i

5. The combination in an apparatus for making plastic forms, of concentric cylinders and a compression plunger movable in the outer cylinder, a convergent section fixed to and dependent from the outer cylinder, a mold core having a iange slidable in the inner cylinder and a shoulder at the bottom of said cylinder upon which the core 'flange normally rests, a'mold shell concen- -tric with the core, means for detachably vconnecting it with the bottomof the con` vergent section, a hollow plunger rod, a flexible connection with the mold core, eX- tending upward through the rod, and means llO lange 'noJrmall-y rests,

lconnecting said shell with stein having a cani u pon its-upper ders and a compression plunger niovableinthe outer cylinder, a 'convergent sectionv fixed to and dependent from the outer cylinder, a lnoldcore having a flange slidable' in the inner cylinder, and a shoulder upon the bottom of said cylinder upon which the a mold shell con` for detachably centric with the core, means the bottom of core to said closure, said'means including 'an upwardly extending tapered "pin .over

which vthe lower end of the core is fitted,`a, end'ancb eccentricto the axis of the p'in, said caniv bev ing adapted'to engage to lock it in position, and a lever by whichtlie stem andcani are ,tnrnablel th bottom of the core 7. The combination in an apparatus tor making plastic forms` ot concentric cylinders, a compression plunger movable in llie outer cylinder, a convergent section lixed to the lower end of the outer cylinder, a mold shell and concentric core dependent respectively -from the convergent shell,k and from the innercylinder, said .core being vertically Within the cylinder, a locking cam by Wliicli `tlievlower end vof the core is 'secured to prevent its being forced np, a lever by which said cani is turnedto engage or disengage a horizontally turnable cutter adapt ed to trim the lower en`d 'a lever vbyvvhioh the cutter is moved simul- -taneously `w`ith the movement of the cam.

y In testimony' whereof I have hereunto set my hand in the presence of two subscribing witnesses. j

GEORGE F. IEMBERT( )N. Witnesses:

J. E. `WYATT A, J. GLAnniNe.

movable of the form, and

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