US99729A - Improvement in nuts for screw-boets - Google Patents

Description

, the parts, is

A represents a screw-bolt, of ordinary hat eine.

NA'lH'A-N4 THOMPSON, OF

- BROOKLYN, NEW YORK.

Letters Patent No. 99,729, dated February 8, 1870.-

w mpnovnivmnrm nous ron SCREW-Bours.

The Schedule referred to n"these Letters P atent and making part of 'the same To all whom it may concern:

Be it known that I, NATHAN THOMPSON, of Brooklyn, in the county 'of Kings, and State of New York, have invented a new and useful Improvement in Nuts for Screw-Bolts, applicable to the fish-joints ofrailroadf; barsand other purposes, of which the following is a full, clear, and exact description, reference being had to the accompanying drawing, forming part of this specification, and in which- Figure 1 represents a `'transverse section, through a railroad-bar, with fishing-plates applied thereto, and secured bya bolt having my improved nut fitted to it';

Figure 2, a longitudinal view of the bolt, detached;

Figures 3 and 4, an edge and inner-mee view ofthe interior portion .of therilnproved nut; j

. Figures 5 and 6, an edge and outer-face view of the exterior portion of said nut; and Y i Figure 7, a face view of Va spring used in the nut.

' Similar letters of reference indicate' corresponding parts. t

My invention, while applicable to screw-bolts, rods,V

or bars, generally, irrespective of the purpose to whicl-iV the same may be applied, will be best explained, so far as regardsmaking clear its advantages, by associating vit with screw-bolts applied to securing the sl1-joints of railroadbars, and will here be desclibed in such connection. lhe same, however, is applicable to an yboltfastenings, as, for instance, those used in various parts lof locomotive and other steam-engines, in which either expansion and lcontraction, as produced by variation of temperature or jar, as arising from the working of apt to loosen the' bite of the nut on the surface itis screwed against.' To thisrend,

n The improvement consists of a compound nut, the

construction an'darrangement of parts of which, rela- 4`tivelyto each other, as hereinafter described, consti` tutes the subjeetof the invention.

In the accompanying drawing-J t or any snitablel construction, applied to secure the sh-plates B B of a railroad-bar C.

My improved nut, which is represented as fitted on the screw-'end of said bolt, to ett'ect the tightening up of the same, consists of an inner nut, D, made to' fit the screw-,thread of the bolt and outer-nut follower or shell E, together with au enclosed and interposed spring, 11", preferably made of vulcanized India rubber.

The inner nut D is of hexagonal or other suitable shape for a portion, a, of its length, to 'secure its turning with and being turned by theouter-nnt follower or shell E,which iscorrespondingly shaped, at b,to t said inner nut, with freedom to slide or play longitudinally over it, and which outer shell is `of nut or other Vsnit-able shape on its exterior, to facilitate it-s lbeing turned and turning the inner nut.

' The interior of the' shell E, at its rear portion c, is preferably of cylindrical form, andthe rear exterior portion d of the inner nut D of corresponding shape, with, it may be, a collar, e, at back, arranged to allow of backward play to the -shell E when screwing the From this description, and by reference toy iig. l of the drawing, it will be seen that on turning the compound nut by the shell or follower E, to screw up theinner nut, the rubber ring or spring F is compressed and made toproduce frictional hold or bearing of the inner face of the follower E against the fish-plate B, and the further the nut D i s screwed up the tighter or closer such elastic frictional hold of the follower on said plate becomes, thereby providing alike for expan-' sion of the bolt or jar to the fastening, without freeing the compound nut from bearing-pressure on the plate, or from getting loose-on the bolt, and in this re spect heilig much more reliable than wiring the nut, and `dispensing with the usual locknut as used in many bolt-fastenings.

It is an important element in this compound nut that the spring F is encased and protectedV by the follower, and so that it is restrained from being expanded vlaterally without giving out useful effect on said nut.

The spring F may in some cases be made of cork, Vor even 4soft, wood, or a spiral or other metallic spring 4may be-used; but I do not confine myself to any particular material, so long as it is of va yielding or elas-` `tio character.

By the special construction of the compound nut as herein shown and described, the fit of the hexagonal or angular portion uof the inner nut D within the correspondingly-shaped portion b ofthe follower E not only insures the turning ofthe nut by the follower, but the latter prevents oil applied to the screw-thread of the bolt o'r its nut from passing to the rubber or spring F, to injure it.

The t of the circular portion d of the nut within the like-shaped recess c in the follower, and application of an outside ange, head, or collar e, also provides for ,exclusion of cil and' dirt from the outside, and the collar e gives a neat iinish to the compound nut; also, the circular constru'ction of the parts d and c allows of an annular spring,F, being used; What is here claimed, and desired to be secured by Letters Patent, is-- The 4outer shell cr follower E, constructed with a circular recess, c, and reduced hexagonal or angular inner-,cavity or portion b, in combination with the nut` D, constructed as at a and b, ,to correspond, and formed with an outer head or collane, for operation in connection with an annular or other spring, F, substantially as shown and described. Witnesses: NATHAN THOMPSON.

HENRY T. BROWN, 4

FRED. Haynes.

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