US1314090A - John b - Google Patents

Description

JOHN n. MITCHELL, or EvANs'roN, ILLINOIS, AssIeNoa To WILLIAMH. MINEB, or

cHAzY, NEW Yoan.

INSULATION FOR REFRIGERATOBFCARS AND THE LIKE.

Specification of Letters Patent.

Patented Aug. 26, 1919.

Application led March 4, 1918. Serial No. 220,331.

To all whom t may concern:

Be it known that I, JOHN R. MITCHELL, a citizen of the United States, residing at Evanston, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Insulation for Refrigerator-Cars and the like, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part. of this s ecification.

This invention relates to improvements in insulation for refrigerator cars and the like.

One object of the invention is to provide a comparatively inexpensive and simple form of insulation for refrigerator packing, more particularly adapted for refrigerator cars and which may be applied with very small effort.

Another and more specific object of the invention is to provide an insulation of the type above indicated which may be substituted for the most common form of insulation now employed on refrigerator cars and which will prove more effective while at the same time being obtainable at less expense.

In the drawing forming a part of this specification, Figure 1 is a horizontal,l sectional view of a portion of a side of a refrigerator car, the section extending through the side doors of the car and showing the latter in closed position. Fig. 2 is an enlarged, sectional view, showing the edge portion of one of the refrigerator car members with my improvements associated therewith, the position of the insulation being that occupied when the doors of the car are open and there is no pressure upon the insulation. Fig. 3 is a view corresponding to Fig.

2, but illustrating the condition of the parts.

when the doors are closed and the insulation is under compression. And Fig. 4 is an elevational view of the edge of one of the insulated members with the outer fabric or padding removed to more clearly illustrate the detailed construction of the spring backing strip.

In said drawing, 10 and 11 denote two pivoted side doors of a refrigerator car having beveled meeting edges in the usual manner, said doors being pivoted to the side wall 12 of the car in the usual manner. As is customary, insulation or packing is provided between tlie meeting edges of the door and car wall and the meeting edges of the doors themselves to thereby prevent tiansference of heat from one side of the car wall to the other when the car is in transit.

Inasmuch as the insulation is the same in all places, it is necessary to describe the insulation for one part only.

.Referring now t0 Figs. 2, 3 and 4, the sidewall 12 is shown as provided with a vertically extending groove or recess 13 along its edge against which the opposed edge of the door 10 bears when the latter is 1n closed position. Said groove or recess 13, as shown, is of the form and size now commonly found in refrigerator cars heretofore employing the so-called .La Flare refrigerator door packing, the one most general in use and my improved insulation is so designed that it may be substituted for the said La Flare insulation to thereby minimize expense to the users. Secured to the wall of the car along each edge of the groove 13 are sheet metal spring backing strips 14-14, each ofsaid strips 14 being secured along its edge at one side of the groove 13 by any suitable means, such as the series of nails 15, and preferably the edge of the car curled, as indicated at 1 so as to facilitate the compressing action without danger of tearing the fabric placed thereover.

As clearly Shown in Fig. 4, each strip 14 is formed in relatively short sections 114-114, each of which is independently flexible. This may be conveniently done by slitting the strips 14 at intervals, as indicated at 18-'18, although should it be desired, individual sections may be employed. The object of providing the strip with independently flexible sections is to insure a proper spring backing throughout the entire length of the covering fabric and to obviateany variation which might occur from warping or deformation of the opposing edge of the door. Also, heretofore where a. single backing element has been emplo ed for the fabric, if the backing strip itself as become warped, as in the case of a wood insure a more uniform springbacking thanv heretofore and without increased expense.

The spring strip may be covered in any desired manner, as for instance, by felting 19 tacked or nailed to the edge of the car wall and over the felting may be placed a facing of canvas 20.

As clearly appears from Fig. 3, when the insulation is under. compression, the fabrics are supported substantially throughout the entire Width of the groove or recess 13 with the exception of a slight spacing at the center. This spring support is insured throughout the entire length of the groove due to the sectional .formation of the spring strlps, except possibly in isolated points where the wood of a door may be unduly warped or some unusual injury ha's occurred to the inslllation.

It is evident that the spring strips may be v manufactured with simple machinery and at small expense and that the same can be applied without diiiiculty inasmuch as nailing is all that is required.

1. In a packing for refrigerator car doors and the like, the combination of a structural element formed with a recess extending along the line of closing, and a compressiblev recessed structural element, and sheet metal' springs attached along opposite sides of said recess and extending to near the middle of the same along the lnner side of the covering approximately in contact therewith from the edges of the recess to the free edges of the springs, and subdivided into a plurality of independently bendable sections.

2. In a packing for refrigerator car doors and the like, the combination of a structural element formed with a recess extending along the line of closing, and a compressible packing extending along 'said recess and adapted to be engaged and compressed b 'an opposing structural element, one of sai structural elements being a door, said packing comprising a flexible covering arranged over said recess and attached to the said recessed structural element, land a sheet metal spring attached along the side of said recess, and extending over the same along the inner side of the covering approximately in contact therewith from the edge of the 'recess to the free edge of the spring, and

subdivided into a plurality of independently bendable sections.

In witness that' I claim the have hereunto subscribed my name this 14th day of Feb., 1918.

JOHN R. MITCHELL.

foregoing I

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