US461453A - Willis d - Google Patents

Description

(No Model.) n Y W. D. SHERMAN. CORE FOR DRAIN TILE MOLDS.

110.461,453. Patented Oct. 20, 1891.

'mz noms versus ce., mow-mno., mswmorsn, u. c.

UNITED STATES PATENT OFFICE.

IVILLIS D. SHERMAN, OF OMAHA, NEBRASKA, ASSIGNOR TO THE UNION HYDRAULIC DRAIN TILE COMPANY, OF SAME PLACE.

CORE FOR DRAIN-TILE MOLDS.

SPECIFICATION forming part of Letters Patent No. 461,453, dated October 20, 1891. Application filed December l1, 1890. Serial No.;374,358. (No model.)

To all whom t may concern:

Be it known that I, WILLIS D. SHERMAN, a citizen of the United States, and a resident of Omaha, in the count-y of Douglas and State of Nebraska, have invented certain new and useful Improvements in Cores for Sewer-Pipe and Drain-Tile Molds; and I do hereby declare that the following is a full, clear, and eX- act description of the invention, which will enableothers skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification.

My invention rela-tes to improvements in contractible cores for sewer-pipe and draintile molds.

In making sewer-pipe and drain-tile and other similar` articles of concrete or cement a' mold is employed consisting of an outer shell and an inner core with an intervening space between corresponding with the pipe to be made. This space isgradually filled in with damp or wet concrete or other material, which is tamped or compressed by means of tamping-bars during the operation of filling, so that a homogeneous pipe will be the result. These tamping-bars may be operated by hand or by machinery, as may be found most desirable. Owing to this compressing or tamping of the material of which the pipe is composed and the contraction due to evaporation, it is very dicult to remove the core, the pipe frequently being injured and destroyed in the attempt.

.The object of my invention, therefore, lis to provide a contractible core for sewer-pipe and drain-tile molds which can be caused to collapse or be drawn out of contact with the interior of the pipe, thus allowing it to be read-` In the said drawings the core is shown as being composed of two outer and two inner sections designated by the reference-n umerals l l and 2 2, each consisting of a curved vertical plate of cast-iron or other suitable material. The outer sections l l at their ends are preferably slightly increased in thickness and beveled, as shown at 3, Fig. 1,forming av beveled or inclined face, extending from top to bottom thereof. The inner sections 2 have their ends bent inwardly at an angle to the remaining portion, forming vertical wings 5, which it snugly against the inclined faces which overlap the same. These wings 5 at suitable intervals are provided with slots 6, through which pass the headed pins 7 ,which are screw-threaded at their ends and received in corresponding holes in the faces. The heads of` these pins bear loosely against the wings 5, so that said wings and the inclined faces can slide upon each other.

Located upon the interior of the sections l, near the top and bottom thereof, are vertical' guideways, each consisting of two parallel ribs S, which may be connected at each end by the cross-ribs 9. These ways are designed to receive the free ends of the bars or rods 10, which are secured at their other ends to a vertical bar l2, located approximately in the center of the core. Pivoted to this bar I2 near the top and bottom are arms 13, which are pivoted at their other ends to lugs I4, secured to the sections 2.

Formed with or secured to bar 12 is an upwardly-extending rod l5, which carries a cover 16, corresponding in shape with the core, and which tits down upon the tops of the sections, thus preventing the entrance of lling material to the interiorof the core. The cover and the sections l and 2 Where they meet,when the cover is in place, are provided with annular recesses, so as to make a snug and close t. The cover is provided with a central boss I7 and a. set-screw 18, by which it is adjustably secured to the rod 15.

The operation will be readily understood. When the core is placed within the mold, the parts will occupy the positions shown in the drawings. It will then be seen that the outer portions of the sections 1 and 2 where they meet will be flush with each other, thus pre- IOO senting a smooth unbroken surface of a contour corresponding with the interior of the pipe to be produced, with the cover-16 snugly seating upon the upper edges of said sections. After the filling material has been inserted in the space between the core and shell and tamped down t0 form the pipeA and it is desired to Withdraw the core, the rod 15 is grasped by suitable machinery or by hand and drawn upward. This will cause the bar l2 to be elevated, raising the cover out of contact with the sections and actuating the pivotedarms 13, which will draw the sections 2 2 inwardly-or toward the center, which in turn, by means of pin-and-slot connections with sections l, will also draw in Vthe latter, thus causing` the core to be contracted and forced out of contact with the interior of the tile and enablingittobereadilywithdrawn. The bars or rods 10, working in the guideways, serve to steady and guide the bar l2 and move upwardly therewith. It will be seen that the free ends ot' these rods l() do not quite extend to the sections l where the latter are extended, as shown in the drawings, a slight space being left therebetween lo provide for the contraction of said sections. When the core is returned to the mold and the central bar pushed down, the sections will be expanded to again assume their proper positions.

While I have illustrated in the drawings a core adapted to make egg-shaped or oval pipe, itis obvious that the same may be employed in connection with circular, square, rectangular, or other shaped pipe without departing from the principle of the invention, and therefore I do not wish to be understood as limiting myself to any particular form or shape of core or of the sections composing the same.

The invention will be found to be peculiarly adapted for employment in connection with machines for making sewer-pipe and draintile, such as is disclosed in an application filed byme of even date herewith, Serial No. 374,356, and with a concurrent application for an mprovement in shells for sewer-pipe and draintile molds, Serial No. 374,359, although it is equally well adapted for use with other styles of machines andalso for hand-made pipe.

Having thus described my invention, what I claim is- A core for sewer-pipe and drain-tile molds, consisting of the outer sections having beveled ends, the inner sections having inclined slotted wings, the headed bolts, the vertical bar, the arms pivoted to said bar and to the inner sections, the guideways on the outer sections, and the rods lworking in said guide- Ways and secured to the vertical bar, substantially as described.

In testimony that I claim the foregoing as my own I have hereunto affixed my signature in presence of two witnesses.

WILLIS D. SHERMAN.

Images