US2005979A

US2005979A - Drier felt for paper making machines

Info

Publication number: US2005979A
Application number: US735160A
Authority: US
Inventors: Milnes Tom
Original assignee: AYERS Ltd
Current assignee: AYERS Ltd
Priority date: 1934-07-14
Filing date: 1934-07-14
Publication date: 1935-06-25
Anticipated expiration: 1952-06-25

Description

Patented June 25, 1935 uNlr-Eo STATES DRIER FELT FOR PAPER- MAKING -MACHINES Tom MiIn'eaTLachute Mills, Quebec, Canada,

assignor of one-half to Mills, Quebec, Canada Ayers Limited, Lachute Application Jul 14, 1934, Serial No. 735,160

' 4 Claims. (o1.'24 33) This invention relates to drier felts for paper making machines and the object is to provide improved means for joining the ends of a drier felt to provide a strong andsatisfactory joint that will not fail when the felt is used on modern high speed Fourdrinier machines.

The ends of a Fourdrinier drier felt are usually overlapped and joined together by stitching or riveting. This requires considerable time and labor and produces a type of joint that is unsatisfactory in many respects. It is desirable that the drier felt should present a smooth and continuous flat paper carrying surface substantially free of projections. From this standpoint alone the present method of fastening the ends of the drier felt in overlapping relation is objectionable since one of the overlapping ends constitutes an undesirable projection on the paper carrying surface of the felt. When secured together by stitching the overlapping ends frequently become detached since the stitching will not long withstand the wear to which it is subjected, this being particularly true when the felt is used on modern high speed Fourdrinier machines. When the overlapping ends of the felt are secured together by riveting it frequently happens that one or more of the rivets become detached and cause considerable damage to the paper and to the drier rolls. In some instances detached rivets have been carried through to the calender rolls. A further objection to the stitching or riveting of the ends of the felt in overlapping relation is that these ends cannot be readily detached when it is desired to replace the felt.

According to the present invention, the foregoing difiiculties are eliminated by providing the ends of the felt with integral interfitting loops through which one or more retaining keys are passed to secure the loops in their interfitting relation. The loops are formed by folding, and slotting the ends of the felt so that the folded portions lie at the inner side of the felt when the two sets of loops are secured together in their interfitting relation. This construction enables the two sets of loops to be secured together in interfltting relation with their outer sides substantially flush with the outer or paper carrying surface of the felt. In addition, it provides a joint that will last as long as the felt itself and which enables the two ends of the felt to be readily separated by removal of the retaining key holding the loops in their interlocking relatlon.

Proceeding now to a more detailed description of this invention reference will be had to the accompanying drawing wherein- Fig 1 is a perspective view of the two ends of a drier felt joined together in accordance with this invention, one of the interfitting loops of the felt being broken away to expose the key holding the two sets of loops in their interfitting relation.

Fig. 2 is a perspective view of the retaining key and the two ends of the felt as these parts appear prior to the making of the joint.

Fig. 3 is a transverse sectional view showing a slight modification in which two retaining keys I are employed.

Referring more particularly to Figs. 1 and 2, 5 and 6 designate the two ends of the felt which are to be joined together. The end 5 presents integral projecting loops 1 adapted to be fitted between similar loops 8 projecting from the end 6. The two sets of loops are fitted together as shown in Fig. 1 and secured against separation by passing a retaining key 9 therethrough. This key is preferably a relatively thin flat bar having its longitudinal edges rounded off to eliminate sharp edges that might cut through the loops. To prevent casual displacement, this key is preferably provided with openings In so that it may be stitched to the loops 1 and 8 as indicated at H and i2 in Fig. 1. The manner in which the loops 1 and 8 are formed as integral portions of the felt is clearly indicated in Fig. 2. As here shown each end of the felt is of two ply construction, one ply being the reversely folded flap M which is fastened flat against the inner surface of the felt by suitable lines of stitching indicated at l5. After the flaps l4 are folded and stitched in place the folded edge portions of the felt are slotted, as at I6, to provide the knuckles l and 8.

In Fig. 3 I have shown a slight modification in which two retaining keys 9 are passed through the interfitting loops 1 and 8 and secured in place by stitching indicated at l8 and I 9. Where additional key strength is required it is more con venient to pass two keys, one after the other, through the loops 1 and 8, than to insert a single key of the same overall thickness. Another advantage is that one key may be used as a shim to take up looseness between the previously inserted key and the knuckles.

Particular attention is called to the fact that both of the flaps M are disposed at the inner side of the felt. This enables the loops 1 and 8 to be fitted together so that the outer sides of these loops are substantially flush with the outer or paper carrying surface of the felt, thus enabling the continuous flat paper carrying surface to be maintained throughout the entire length of the felt. Another advantage to be noted is that the metal retaining key or keys used in place of the stitching and riveting heretofore empoyed are not subject to wear by contact with the drier rolls since they are completely enclosed by the loops 1 and 8 which, being integral parts of the felt, will last as long as the felt itself.

When a felt, having the ends joined in accordance with this invention, is to be removed for repair or replacement this may be quickly and conveniently accomplished by cutting the stitching holding the retaining key or keys in place and.

then withdrawing the latter to permit separation of the

loops

7 and 8. The stitching of the retaining key or keys to the loops 1 and 8, while desirable to prevent possibility of casual displacement of the key or keys, is not absolutely essential and may be omitted.

Having thus described my invention, what I claim is:

1. A drier felt having end portions turned back and fastened to the body of the felt to provide integral tubular terminals, each of which is slotted to provide a plurality of laterally spaced fabric loops, the loops of one terminal being fitted between the loops of the remaining terminal, and a retaining key passing through the two sets of loops and serving to hold them in their interfitting relation, said retaining key being fastened to certain of the loops.

2. A drier felt as claimed in claim 1 in which the retaining key is stitched to certain of the loops.

3. A drier felt having end portions turned back and fastened to the body of the felt to provide integral tubular terminals, each of said terminals being slotted to provide a series of loops fitted between the loops of the remaining terminal and a pair of retaining keys passing through said loops and serving to hold them in their interfitting relation, said keys comprising two relatively thin and wide fiat strips of metal flatly engaged with each other.

4. A drier felt as claimed in claim 3 in which the retaining keys are provided with registering openings and are stitched to certain of said loops by stitching passing through said openings.

' TOM MILNES.