Improvement in bolts asd bolt-heads
US 63706 A
Description (OCR text may contain errors)
@einen tutes @anni titre.
IMPROVEMENT IN BOLTS AND BOLT-HEADS.
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TO ALL W'HOM IT MAY CONCERN Be it known that I, JOSEPH CROMPTON, of Little Falls, in the county of Passaic, State of New Jersey, have invented a new and useful Improvement inf Bolts and Bolt-Heads, und that the following is a full and exact description thereof, which will enable those skilled in thev art te make and use the same, reference being had to the accompanying drawing, forming partot` this specification, in Which- Figure 1 shows the bolt, with its appurtenances, applied to secure n patclu marked B, upon the side oi' a boiler. 4 ix Figure 2 is an axial section of the bolt and its appurtenances, showing also asectidii of the boiler-plate und patch.
Figure 3 is an elevation, showing the bolt-head, the eccentric-collar, and the patch, the boiler-plato being supposed to he removed, but its outlines being represented in red. I
Y Figure 4 is a plan view of the small end of the bolt.
lhe object of this invention is to provide a bolt which will enable one to attach and secure one plate or article to another in cases where the inner side of the latter is inaccessible, so that one cannet get in a position to apply a'rivet. In order te illustrate my invention, I have selected the example of a steamV boiler, to which, while it is inaccessible, or while hot, a. patch`J is te be applied to cover a fracture, and'n'hich c-Jpatclf eonsequently must be applied from without. i
The letter A designates a portion of thc side or plate of a steam boiler, and B is part of a patch, which isto be secured thereto. Holes are made through the boiler-plate at the several places where the bolts which secure the patch are to be inserted, and holes of like size and at equal distances apart are made in the patehf' The drawing shows one such hole through the boilerplate and patch. The letter C designates abolt used for uniting the patch to the boiler. The bolthas a screw-thread cut on its body te receive a nut, E. v It has an eccentric-head, F, whose diameter is about the same as that of the holes in the boiler and patch; or, its diameter may be a very little less, in order to allow the head to be put through them. When the head has been pushed through far enough to clear the boiler-plate, the bolt is brought up against the edges of the holes, so as lte make the shoulder or eccentric-enlargement of the head, clearly shown in the drawing, overlap the boiler-plate. In order to retain the bolt-headin this position, an eccentric-collar, II, (one side being thicker than the other,) is inserted at the same time with the bolt, or else after it hasl been got in the holes, and before itis brought up to its place. In this example the collar H does not form a complete circle, but is crescent-shaped, as is seen in iig. 3. The thickest part of the cellar is put opposite the ecccntrieity of the head F by turning the bolt after it and the collar are pushed in far enough, so as to cause its shoulder to overlap the edge of the hole in the boiler, the collar being made of such dimensions as to till the space between the body of the belt and the sides of the holes. In order that the workina-n or operator may know the exact position of the head, and whether its enlarged side is diametrically opposite the thicker part of' the collar, I make an indentation, G, er other mark on the end of the' bolt near the side on which the enlargement or eccentricity of the head F is located, by observing which indentation or mark, andcausing it to be diametrically opposite the thickest part of the collar, one can ina-ke sure that the bolt-head is in its proper place. The collar and boit together are oi' such size er dimensions as to lill the holes as snugly as possible', in order to proven/t leakage as much as possible. The collar can be matic of copper or iron, or other suitable niateriah Copperis suitable for the purpose, because it expands readily, and therefore will aid in making a tight joint about the bolt. After the belt and collar are in place, a washer, I), of copper, or other suitable material, is put on the bolt, and the nut E is then screwed tight, so as to draw the patch B and the holt-bead snugly against the opposite surfaces of' the boiler-plate. Inorder to insure againstlcakagc the bolt may have a fillet of tow Yor other ibrous packing wound around it between the end of the eccentric-collar'and the bolt-head or, the collar may be made shorter than the united thickness of the boiler-plate and the patch; and the annular space thus left between the circumference of the bolt and the sides or edge of the hole in the patch may be occupied by a ring et' copper or other soft metal, which can be jammed up by the tightening ofthe nut, and expanded so as to close the joint; or, both theseuiodes of packing the joint may be adopted. The patch B is united to the boiler in this manner at as many places as is found necessary and desirable. This mode of uniting two pieces of metal or othei` material een be applied and used in many other places and circumstances besides the one described in this example.
Hoving thus described my invention, what I claim, :mil lesite to secure by Letters Put-ent, isv 1. The eocentrically-headetl screw-bolt C, in combination with the nut E :md the eceentriocolhu H, plaeetl around the bolt, substantially as described.
2. I also claim the combination of the bolt C, having :m eccentric-heed, F, with the @comizio-collet H, o1"F its equivalent, the patch ox plate B, and the boiler-plate, or article to which the plate l? is united, substantially as shown.
Witnesses JOHN BERKEL- HENRY Surnom-x