Untitled record

P. Bn zyp

<img file="US34890A_D0001.tif" />

AM. PHOTO-LITHO.CO. N.Y. (OSBORN E'S PROCESS)

United States Patent Office.·

HENRY KNIGHT, OF JERSEY CITY, NEW JERSEY.

IMPROVEMENT IN MOLDS FOR CEMENT PIPES.

Specification forming part of Letters Patent No. 34,890, dated April 8, 1862.

To all whom it may concern:

Be it known that I, Henry Knight, of Jersey City, in the county of Hudson and State of New Jersey, have invented a new and useful Improvement in Molds for Molding Hydraulic-Cement Pipes; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming part of this specification, in which—

Figure 1 is a vertical section of my improved mold; Fig. 2, a horizontal section of the same. Fig. 3 is a modification of the flask and detachable collar used in connection with my main improvement. Fig. 4 is a vertical section of the flask inverted and used in connection with one of my present improvements—viz., with the detachable collar maria tubular, and the core-bar also made tubular.

The same letters of reference in the several figures indicate corresponding parts.

My invention under this patent consists, first, in certain means for producing a compression of the cement within the lower end of the vertical flask, and thereby forming a solid collar with a continuous right-angle socket within it after the flask has been filled from top to bottom with cement.

_My invention consists, second, in the combination and arrangement of a tubular core, tubular detachable top collar, and a vertical flask, as hereinafter described.

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and operation.

A is a stationary platform, and B a vertical tubular core projecting up from the center of the same. This core is open at its upper end, so as to receive the tubular portion of a detachable collar C, which is let down a short distance into the tubular core and sustained by means of the shoulder a, formed by the enlarged solid portion of the collar and the tubular portion thereof, as shown. This collar is used only at the finishing operation.

D is an annular base-plate mounted on legs b b and arranged around the core B, its legs resting loosely upon the platform. The circular opening c through the center of this plate is of the same diameter as the socket to be formed in the collar of the cement pipe.

E is a circular flange or bead or shoulder I projecting up from the top of the base-plate. This flange E is of a little greater diameter than the lower end of the flask which is used in molding the cement pipe, so that said lower end may fit snugly within it, as shown. There are also several small holes d d formed through the base-plate and two or more lifting-loops e e attached to its upper surface, for a purpose presently described.

F is a sliding collar with a horizontal circular flange/formed on it, as shown. This collar is fitted snugly round the core and its flange extends under the base-plate D a considerable distance. From the top of the flange / several guide-bars g g extend up, and when the base-plate is adjusted over the core these guide-bars pass through the holes d d, and thus couple the collar to the baseplate, the connection being maintained by means of pin’s h h, which pass through one or another of a series of holes in the guide-bars, as shown.

G is a vertical flask made in two. or more parts, which are clamped together, as shown at i i, or in any proper manner. The lower end of this flask is of a greater diameter than the upper end. In a word, the flask is formed with two diameters, and that portion which is of the largest diameter is connected with that portion which is of the smallest diameter by means of a nearly-horizontal flange/ which forms a shoulder between the two portions of the flask, as shown. This flask is arranged round the core and the lower detachable collar, and is held in position by means of the circular bead E and an adjustable centeringtable (not shown) such as I usually employ for steadying molds at their upper ends, and described in my patent dated Maj⁷ 8, 1860.

To operate with the mold when the parts are arranged as shown in Figs. 1 and 2, withdraw the pins h h and lower the collar F from the position shown in black lines to the position shown in red lines. Then remove the collar C. The cement maj⁷ now be inserted into the flask from the top, and when the flask is filled from top to bottom and the cement rammed compactly the collar F must be forced upward from the position shown in red to the position shown in black lines, so as to more perfectly compress the cement into the enlarged part of the flask and to form a continuous right-angle socket, as shown at 11,

34,890

Fig. 1. The cement pipe I having in time “ set,” the pins h h are again withdrawn from the holes d d, in which they were placed when the collar F was raised, and the collar again lowered to the position shown in red. Before the pipe was allowed to become set the collar C, as should have been before stated, is placed on top of the flask and its tubular portion inserted into the core, as shown in Fig. 1. The collar thus adjusted is revolved on the core and made to sweep off the surplus cement? and smooth and finish the end of the Cement pipe. This done, the collar C is again removed. To remove the p'ipe from the core, the flask, with the pipe in it, is lifted over the core by taking hold of the lifting-loops of the base-plate, said plate serving to sustain the end of the pipe in its ascent. The mold and pipe are deposited upon a stand and the clamps which hold the sections of the mold together withdrawn, and the sections thus left free to be lifted from round the pipe. The sections being withdrawn, the pipe is raised off the base-plate, and said plate with the sections of flask are readjusted over the^- core, ready for another operation. ’ ·

In Fig. 3 a flask made with but one diameter is shown, and the collar C is made of ring form and of a diameter externally equal to the internal diameter of the flask. With this change of construction cement pipe I with a right-angle socket I at one end and a rightangle shoulder I' at the other end are formed, as shown. The operation of the top collar in this plan differs only in its being pressed down into the cement a sufficient depth to form the right-angle shoulder 1' and in the collar revolving against the inner circumference of the flask, instead of upon the core.

In all other respects the operation of the mold is the same as that shown in Fig; 1.

In Fig. 4 the sliding collar F is not shown and the base-plate is made to fit snugly round the core. The flask shown in Fig. 1 is represented as inverted, and the tubular collar is set into the upper end of the core until its top surface has come even with the top edge of the mold. With this change the same style of cement pipe as is produced by the mold shown in Fig. 1 is produced, and, in fact, the same style of pipe as is produced with the mold patented to me May 8, 1860, is here produced.

In practice I have found that cement pipe with right-angle sockets are the best for forming a tight joint. The sockets, however, mightbeformed with collars rounded slightly at their corners or by. collars with angles greater than right angles without departing from the invention embraced under this patent. I have shown the modifications in Figs, 3 and 4 in order to exhibit the differentjnodes of applying my improvements.