US1870657A

US1870657A - Purnace roll or shaft

Info

Publication number: US1870657A
Application number: US477514A
Authority: US
Inventors: Frederick S Snyder; Carl H Sipe
Original assignee: DEMMIE T SIPE
Current assignee: DEMMIE T SIPE
Priority date: 1930-08-25
Filing date: 1930-08-25
Publication date: 1932-08-09
Anticipated expiration: 1949-08-09

Description

Aug. 9, 1932. F. s. SNYDER ET AL 1,870,657

FURNACE ROLL 0R SHAFT Filed Aug. 25, 1930 Patented Au 9, 1932 UNETED STATES PATENT GFFHCE FREDERICK S. SNYDER AND CARL H. SIPE, OF BEAVER FALLS, PENNSYLVANIA, AS-

SIGNGBS TO DEMMIE 'I'. SIEE, OF LATROBE, PENNSYLVANTA FUENACE ROLL OR SHAFT Application. filed August 25, 1930. Serial No. 477,514.

()ur invention relates to aroll or shaft serving as means for conveying articles through an annealing or normalizing furnace.

., According to previous practice, shafts for 35 pr vent bowing and warping, either during casting or when operating in the furnace. The cylindrical construction, furthermore, lacks the strength required for certain uses.

A further objection to the present type of roll is that defects in the casting, such as gas pockets, exhibit a tendency to enlarge or erode, which necessitates that they be removed by cutting out a portion of the shaft or roll which is thereby weakened to a dangerous extent.

ll e have invented a hollow roll or shaft for furnaces, which overcomes the foregoing objections. In accordance with the invention, we provide a hollow roll or shaft, preferably cylindrical, having its ends tapered to form bearing trunnions, the tapered portion of the roll being placed within the furnace walls. The roll itself is reinforced by longitudinally extending radial ribs disposed at right angles within the shaft and formed integral therewith. The cylindrical wall of the roll and the ribs themselves are perforated to permit uniform distribution of heat, whereby distortion of the roll is largely prevented.

M Our hollow roll, longitudinally reinforced,

is light in weight and characterized by great strength. Because of the ventilating perforations, a uniform heat is attained by all parts of the roll. The internal reinforcement provides a rigid construction which prevents the occurrence of bows, fractures and unequal shrinkage strains which might cause fracture of the rolls. In addition, the reinforcement also provides av better distribution of shrinkage strains during the castin rocess as well as durin o eration.

i: i D

The reinforced roll also possesses great elasticity, which enables it to stand expansion and contraction, resulting from heating and cooling, to which the roll is subjected in oper ation.

For a full understanding of the invention, reference is made to the accompanying drawing illustrating a present preferred embodiment thereof.

In the drawing,

Figure 1 is an elevatioual view partly in section; and

Figure 2 is a transverse sectional view along the line Illl of Figure 1.

Referring in detail to the drawing, our invention comprises a hollow roll h.ving a cylindrical body portion 11 and tapering

end portions

12 and 13. The

tapered end portions

12 and 13 are embedded in the re fractory walls 141- of a heat treating furnace. Trunnions 15 and 16 project from the

tapered ends

12 and 13 and are adapted to be rotatably seated in suitable bearings for cooperation with any desired drive mechanism.

The interior of the body 11 of the roll 10 is hollow and is provided with longitudinally extending ribs 17 and 18. The ribs are cast integral with the roll 10 and lie in radial planes at right angles to each other. The ribs are provided with holes 19 and the cylindrical wall of the roll 10 is likewise perforated at 20.

Material en ing discs 21 are carried on the roll or sha-t 10, being secured thereto by any suitable means, such as a key 22. The periphery of the disc may be formed in any suitable manner depending on the product to be conveyed, for example, flat for sheets or grooved for rods. The discs are perforated at 23.

The advanta es of the construction described in the foregoing will be apparent to those skilled in the art. The reinforcing ribs assist the cylindrical body of the roll or shaft to withstand the great strains imposed by the expansion and contraction resulting from temperature changes. his is important in furnaces where high temperatures are employed. As previously stated,

the reinforcement gives a rigid construction which limits the development of bows and prevents fractures resulting from unequal shrinkage strains.

The reinforcement is also effective in withstanding the strains incident to shrinkage during casting of the roll. The roll is light in weight and has great elasticity which further aids it in standing up under considerable temperature changes. The perforations in the roll and the ribs make possible an easy circulation of the heating gases, so that all portions of the roll have the same temperature. Because of the reduction in weight made possible by the reinforcement, many difficulties of proper bearing support and lubrication are obviated.

Although we do not desire to be limited to any particular material, we prefer to employ a chromium nickel alloy for casting the roll, because this alloy is characterized by resistance to high 'tem eratures. While We have employed herein 0th the terms roll and shaft, it is to be understood that they are considered interchangeable and define merely a rotating member for the purpose I of conveying material through a furnace chamber.

Although our description and illustration are limited to one form of the invention, it is obvious that other embodiments may be constructed. It is not vital, for example, that the body of the roll be cylindrical in form, since other shapes 'may be found suitable. Many other changes may, of course, be made in the illustrated construction, without departing from the spirit of the invention.

We claim: 7

1. A furnace conveyor roll comprising a hollow, central cylindrical portion, tapering hollow end portions, integral reduced trunnions, and reinforcing ribs integral with said central and end portions and said trunnions, extending continuously between the latter.

2. A furnace conveyor roll comprising a hollow cylindrical portion, reduced integral trunnions, and integral reinforcing ribs within said cylindrical portion, extending between said trunnions.

3. A furnace conveyor roll comprising a central cylindrical portion, reduced trunnions integral therewith, and continuous ribs within said cylindrical portion integral therewith and extending substantially from end to end thereof.

In testimony whereof we have hereunto set our hands.

FREDERICK S. SNYDER. CARL H. SlPE.