US658572A

US658572A - Digester.

Info

Publication number: US658572A
Application number: US238900A
Authority: US
Inventors: Edgar Guillow Murphy
Original assignee: Individual
Current assignee: Individual
Priority date: 1900-01-22
Filing date: 1900-01-22
Publication date: 1900-09-25
Anticipated expiration: 1917-09-25

Description

Patented Sept. 25, I900.

a W A 6 B E. G. MURPHY.

D l E E S T E 8.

(Application Mad Jan. 22, 1900.)

No Model.)

WITNESSES THE wonnfs PETERS co. PNoTouT'HQ, WhSHINGYOPL n. c.

Nrrn TATES I ATENT FFICE.

EDGAR GUILLOW MURPHY, OF SANDY HILL, NEW YORK.

DIG ESTER.

SPECIFICATION forming part of Letters Patent No. 658,572, dated September25, 1900.

pplication filed January 22,1900. Serial No. 2,389. No modeL) To all whom it may concern:

Be it known that I, EDGAR GUILLow MUR- PHY, a citizen of the United States, and a resident of Sandy Hill, in the county of Washington and State of New York, have invented a new and Improved Digester, of which the following is a full, clear, and exact description.

The purpose of this invention is to construct a cement-lined digester the lining of which will not be influencedthat is to say, cracked and brokenby the contract-ion and expansion of the digester-shell due to the alternate heating and cooling thereof.

This specification is the disclosure of one form of my invention, while the claims define the actual scope thereof.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.

Figure l'is a view of the digester with parts broken away on the line 1 1 of Fig. 2. Fig. 2 is a section on the line2 2 of Fig.1, and Fig. 3 is an enlarged detail section taken horizontally through one of the seams of the digester.

The digester-shell a is constructed in the usual manner-that is to say, of a number of sections of sheet metal fastened together to form the complete shell. These sections have their meeting edges sealed to form the seams by means of exterior butt-straps b and interior inwardly-arched straps c, the three parts a, b, and 0 being riveted together, as shown. The arched butt-straps c extend inwardly to inclose the space surrounding the seam, and thus the seam is protected fromthe action of the contents of the digester, which tend in many cases to destroy the calking of the seam. The shell is now lined with cement, as indicated at d, the cement being laid directly against the inner walls of the shell and extending to the sides of the arched portions of the interior butt-straps 0, such straps serving to break the continuity of the cement lining, which, as shown best in Fig. 3, is of a thickness less than the height of the arched portions of the straps c. The result of this is that the cement is not placed in the shell in the form of a continuous and unbroken layer, but is divided into a number of separate pieces which are independent of each other. With this arrangement contraction and expansion of the metallic shell will not tend to fracture the cement and destroy the lining. Inward of the cement one or more layers of brick eare placed, as shown, such brick completely covering the buttstraps c, as shown.

I am aware that previous to my invention digesters have been constructed with cement linings; but these linings are invariably in the form of an unbroken layer of cement extendin continuously throughout the interior of the aigester, and such linings are known to be disadvantageous in that the expansion and contraction of the digester-shell readily fracture the cement and destroy the lining. The essential feature of my invention is therefore building the shell with the buttstraps 0 having inwardly-projected portions, at the sides of which the cement lining is placed in separate and independent sections, the butt-straps o performing the double function of protecting the seam in the shell and of breaking the continuity of the cement.

Having thus described my invention, I claim as new and desire to secure by Letters Patent-- 1. A digester, the shell of which is constructed of a section or sections of sheet metal, meeting edges of which are provided with an interior butt-strap, a portion of which is arched or bowed inward away from the same, to protect the seam, and a cement lining for the digester, the same being placed in separate and independent masses at the sides of the arched or bowed portions of the said butt-strap, such portions of the buttstrap projecting completely through the ocment, to break the continuity thereof.

2. A digester, the shell of which is constructed of a metallic plate or plates, meeting edges of which are joined by a butt strap or straps, portions of which are projected inward from the shell, and acement lining laid against the shell, the said inwardly-projected portions of the butt strap or straps passing completely through the lining, the buttstraps serving to protect the seam in the digester-shell and also to break the continuity of the cement, which is thus formed into a number of separate and independent masses.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

EDGAR GUILLOW MURPHY.

Witnesses:

GUY R. CLARK, FRED. E. EARLE.