Nine years later, when in his late 60’s and only a few years before his death, he submitted his last patent application (No. 1895/16681), entitled “Improvements in and in connection with Fixing Tubes in Boilers, Coils, and the like”. The complete specification is as follows:
Improvements in and in connection with Fixing Tubes in Boilers, Coils, and the like.
I, THOMAS GOODE MESSENGER of 20 Burton Street, Loughborough, in the County of Leicester, Engineer do hereby declare the nature of this invention and 1 in what manner the same is to be performed, to be particularly described and ascertained in and by the following statement :—
This invention relates more especially to a method of fixing tubes in cast iron boilers and coils so much used for heating greenhouses and other buildings with hot water. It is also designed to facilitate the removal of a defective or damaged I tube, and replace it with a new one similar in every respect to the original, in a short space of time, without the removal of the boiler itself or any component part thereof, except the particular tube affected and its attachments.
For the better understanding of my invention I will describe it (1) the provision of a clear opening through both plates of front end or side chambered water-space, j in order to introduce the tubes and connections into their desired position, thus (by one or any desired number of tubes) connect one side or end with any other side or end chambered or hollow water-space of boilers, coils or the like above referred to, or any two parts of one continuous water-space by means of one or more tubes in such a way that these tubes shall form an integral part of the said boiler or coil &c. (2) a method of connecting, disconnecting or reconnecting each individual tube fixed according to my invention, without it being necessary to interfere with any other part of boiler, coil &c. of which they form a component part. (3) a method of constructing one end of tie-rods or bolts (when such are required) with their attachments in such a way that they may be attached or detached on removal of cover. The following is a description, with reference to the accompanying drawings, how these objects are attained. Fig. 1 is a longitudinal section spewing one tube as fixed according to my invention, illustrating how by repeating it any number can be grouped together. Fig. 2 is an alternative modified method equivalent to Fig. 1 differing slightly in detail but retaining the leading features to obtain similar results. Fig. 3 is a longitudinal section of one end of the tie-rod or bolt and its attachment.
Upon the inner plate J, J1 of each of the chambered water-spaces A, A1 to be connected and upon the outer plate K of water-space A. I form the requisite number of inverted or other recesses or sockets F1, F2, F3, the .clear opening through front water-space A. to be such as to allow the tube with its fillets &c. to freely pass through into recess F3 on. back water-space, F1 and F3 being formed with steps or shoulders projecting inwards, to serve as an abutment against which the jointing material can be compressed F2 being straight bore having no such projection. I then place tubes B constructed of cast or wrought iron, steel, or any required material of the desired size, the length of the tubes to be governed by the distance A is fixed from A1, and upon the external circumference of these tubes, and at a short distance from each of their ends I cast, screw or otherwise fix a fillet or collar to serve as a shoulder against which or by which the jointing material can be compressed, care being taken to so place the said fillets as to ensure the jointing material being kept in position while being compressed.
To each tube I employ a combined tubular compressing ring & cover D, G, (or these may be in separate parts if desired,) with provision in said cover for the screwed end of a bridged bolt C, to pass through, making it water-tight in the usual way at F and the said ring D of the proper length for ensuring it entering socket F2 previous to G entering socket F2. In the side of tubular ring D I form apertures E through two of which the cross head of bridged bolts C pass in order to engage with under side of socket F1, and thus become. rigid to facilitate the forcing forward by nut L, of all, parts left free to move, and. through these as well as corresponding apertures or their equivalent water may freely circulate between tubes and chambered water-spaces indicated by arrows. Fig. 1, thus becoming, (as well as compressing ring), means of communication-between tubes B and water-spaces A, A1. By the above described arrangement and combination of parts annular spaces or recesses F, F1, F2, F3, are formed at each point of connection, into which recesses the tubes &c. are introduced, previously placing upon the ends thereof and likewise upon the tubular compressings elastic jointing rings H, H, H, of india-rubber, asbestos or other suitable and usually employed material, and which elastic rings are thus brought between the resisting and compressing shoulders or fillets. When the several parts above described are placed in position the nut L on bridged bolt is screwed down, which has the effect of contracting the annular recesses, and at the same time compressing the-joint-forming material H, H, H, H, and making each point of connection steam or water-tight. On each side of interior of tubes B, I prefer to cast or fix projecting lugs or cross-bar shewn M Fig. 1 so as to greatly facilitate the removal of a. fractured or damaged tube in order to replace it with a new one, and they also serve for receiving a purposely made tool that may be used for compressing H in F3 (if thought desirable under some circumstances) previous to placing on cover G.
Fig. 2 is an alternative method of obtaining similar results to Fig. 1, in this case I make the two tube joints F2, F3, Fig. 1 separate from the cover G, this-I effect by making the compressing tube or ring D, separate from cover, G, and force it down by means of two set screws 0, 0, Fig. 2 or their equivalent, passing through bridge of bridged or T bolt C, as before described, thus making the-joints H, H1, H2, H3 by two operations instead of one. It may sometimes, under-special circumstances be advantageous to adopt this or equivalent slight modifications in detail while retaining the leading features and requirements for carrying out. i the object of this invention as before described.
When the chambered water-spaces A, A1, are separate parts, it becomes necessary to counteract the pressure brought to bear in compressing jointing material, this. I effect by substituting one or more straight tie-rods or bolts for bridged bolt C and screwed in the same manner at the end passing through cover G, the length of which tie-rod is governed by the length of tubes B, employed in each case. At the extreme end of straight rod, which occupies or passes through the interior of tube B I provide a loop or eye or its equivalent and in the interior of water–space A1 I fix to plate SI-, opposite the centre of the tube it is intended the straight tie-rod should occupy, a hook or equivalent attachment, to receive the-loop or its equivalent on tie-rod, in order to ensure the loop or eye on tie-rod engaging with hook or other attachment, I provide guides to tie-rod or an equivalent arrangement, dotted view P Fig. 1 and section Fig. 3 will shew the arrangement as above described. The number of these tie-rods employed is governed in great measure by the size and form of boiler, coil &c. into which they are introduced, my object in this arrangement is to release the tie-rod from hook attachment upon having access to it by only removing cover G.
A very important advantage is secured over the methods hitherto employed,. (when first fixed or subsequently) in being able to fix each tube separate and independent of any other, as it gives entire control, great facility .and absolute certainty of every joint being perfectly sound though there may be inequalities and variations in the castings. Another great advantage is that in case of a tube becoming damaged it would only be necessary for a short space of time to be occupied by an unskilled workman in replacing a new tube and restore the boiler to its original condition, the removal of G & D only being required to give access to the tubes, and by the lame means .41.1. the tubes can be cleaned which tends to economise the fuel and prevents boiler being damaged by the fire.
Having now particularly described and ascertained the nature of my said inven-tion, and in what manner the same is to be performed, I declare that what I claim is
First. The use of a clear opening through both plates of front end or side of chambered or hollow water-space for the admission of and fixing of each tube separately in boilers, coils and the like, used for heating purposes, as hereinbefore described and illustrated .by the accompanying drawings; .
Second. The configuration and mode of applying compressing and combination of parts as hereinbefore described and illustrated by the accompanying drawings.
Third. The use of lugs or cross-bar, cast or fixed inside of tubes to facilitate the extraction of a damaged tube as before described.
Fourth. The use of hook & loop attachment for long tie-rods passing through tubes, as hereinbefore described and illustrated by accompanying drawings.
Dated this 1st day of June One thousand eight hundred and ninety-six.
THOMAS GOOD.E MESSENGER.