US1008717A - Flexible stay-bolt. - Google Patents

Description

I. G. HUNTER.

FLEXIBLE STAY BOLT. APPLIOATIOH rum) JULY 9, 1907..

Patented Nov. 14, 1911.

FREDERICK GEORGE HUNTER,.OF MONGTON, NEW BRUNSWICK, CANADA.

FLEXIBLE STAY-BOLT.

Specification of Letters Patent.

Patented Nov. 14, 1911.

Application filed July 9, 1907. Serial No. 382,968.

To all whom it may concern:

Be it known that I, FREDERICK GEORGE HUNTER, a citizen of the Dominion of Can, ada, residing at the city of Moncton, in the county of l/Vestmoreland and Province of New Brunswick, Canada, have invented certain new and useful Improvements in Flexible Stay-Bolts, of which the following is a specification.

The invention relates to improvements in flexible stay-bolts for use in connecting the plates or sheets of steam boilers, and other purposes, and it consists in the novel features hereinafter described, and particularly pointed out in the claim.

The object of the invention is to provide an improved stay-bolt structure adapted to securely hold the plates or sheets in proper relation to each other and to yield at one or both ends with the expansion and contraction of said plates.

The stay-bolt of my invention is preferably, though not in all instances necessarily, composed of three members, one of these being a stud or bolt threaded at both ends and the other two being externally and internally threaded sockets to engage threaded holes in the boiler plates and receive the ends ofsaid stud or bolt, a distinguishing feature of the structure being that the stud or bolt while engaging the said sockets has atone or bothends'a loose threaded-connection therewith and therein, whereby said bolt is prevented from drawing out from the sockets but may have a limited oscillating motion therein and thus yield to the expansion and contraction of the plates. Preferably the threaded ends of the stud or bolt will be slightly tapered, and said ends may be fastened within their sockets by transverse pinsv whose ends will closely engage the sockets and whose middle portions will loosely engage the bolt.

The invention will be fully understood from the detailed description hereinafter presented, reference being had to the accompanying drawings, in which:

Figure 1 is a horizontal section portion of the outer and inner sheets or plates of a steam boiler with the flexible stay-bolt of my invention in position connecting the same; Fig. 2 is a vertical section through a portion of the plates or sheets connected by a modified form of stay-bolt embracing some of the features of, my invention; Fig. 3 is a vertical section of same through on the dotted line 8-3 of Fig. 2; Fig. 4 is a section corresponding with Fig. 2, illustrating a further modification of my invention, and Fig. 5 is a section through one end of a further modification of the bolt and its socket, the construction presented in Fig. 5 diifering from that shown in Fig. 1 in the character of the threads formed on the end of the bolt and within the socket.

In the drawings, referring to Fig. 1, 10 designates the fire-box plate, 11 the outer shell-plate, 12 the stud or bolt proper, 13 the inner socket member and 14 the outer socket member, said sockets tightly engaging threaded holes in said plates and being connected by said stud or bolt. The stud or bolt 12 is threaded at its ends. The inner socket-member 13 has an internally threaded socket 15 and an externally threaded shank 16, whose outer end after having been passed through the hole in the plate 10 is headed, as at 17 The inner threaded walls of the socket 15 are straight and engage the threaded end of the bolt 12 with a loose thread-connection, the inner diameter of said socket being greater than the end of the bolt, whereby oscillation of the bolt is permitted. The end of the bolt is further secured within the socket 15 by means of a pin 18 which tightly fits holes in the side walls of said socket and passes through a free aperture 19in said bolt, said pin thus also permitting the bolt to have an oscillatory action when necessary. The outer socket member 14 contains an internally threaded socket 20 and has .an outer poly onal head 21. adapted to receive a wrench or applying tool. The inner walls of the socket 20 are straight and engage their threaded end of the bolt 12 with a loose thread-connection, the inner diameter of said socket being greater than the end of the bolt, whereby oscillation of the bolt is permitted. The end of the bolt is further secured within the socket 20 by means of a pin 22 which tightly fits holes in the side walls of said socket and passes througha free aperture 23 in said bolt, said pin thus also permitting the bolt to have any necessary oscillatory action. The clearance in the stud or bolt- apertures 19, 23 is also desirable in that during the heading or riveting of the outer end of the shank 16, they permit the ends of the bolt to abut against the solid ends of the sockets and take the strains due to such heading or riveting.

In the construction shown in Fig. 1, the parts of the bolt-structure are assembled prior to their application to the sheets 10, 11,

and the socket-member 13 is introduced through the hole 24 in the sheet 11 and then screwed, at its shank 16, through the hole 25 in the sheet 10, the socket-member 14 during this action being screwed into said hole 24, after which the outer end of the shank 16 is headed or riveted. During the application of the stay-bolt structure, the pins 19, 22, compel the socket-members and stud 12 to rotate together.

The stay-bolt structure shown in Fig. 1 will very securely and efliciently connect the sheets 10 and 11 and allow said sheets to expand or contract without creating any detrimental effects, the loose thread-connection at the ends of the stud 12 permitting the latter to freely oscillate during such expansion or contraction. It is not necessary in every instance to provide for the oscillatory action at both ends of the stud 12 but it is desirable in some cases, and hence in presenting the preferred form of my invention I arrange for the oscillation at both ends of said stud.

In the construction shown in Fig. 2, 30 designates the stud or bolt, 31 the inner socket member, and 33 the outer socket member, said member 33 differing from the socket member 14 shown in Fig. 1 only in the character of the threads out within the same. The stud or bolt 30 corresponds with the stud or bolt 12 of Fig. 1 except in that it has a different style of thread out upon it, the threads on the ends of the bolt or stud 30 being on the same plane but forming a loose thread-connection with the threads of the socket members 31, 33, so as to permitof the oscillatory action of the bolt during the expansion and contraction of the sheets 10, 11. The socket member 31 is in the form of a hollow plug closed at its outer end and externally threaded to engage the threaded hole in the sheet 10. The bolt or stud 30 is connected with the socket members 31, 33 by pins 34 corresponding with the pins 18, 22, of Fig. 1. The stay-bolt structure shown in Fig. 2 is applied to position in the manner above described with respect to the structure shown in Fig. 1, with the exception that the socket member 31 is screwed into its receiving hole in the sheet 10 and is not headed. The loose threadconnection of the stud or bolt 30 with the socket members 31, 33 admits of an oscillatory action of the bolt at either end, and it is one of the purposes of my invention that the stud or bolt 30 at one or both ends shall have a. loose thread-connection so as to insure the proper oscillatory action of the bolt during the expansion and contraction of the sheets 10, 11.

In the construction shown in Fig. 4, 40

designates the stud or bolt, 41 the inner socket member, and 42 the outer socket member, said stud or bolt and outer socket member corresponding exactly with the stud or bolt and outer socket member of Fig. 2, with the exception that they employ a difierent style of screw thread. The inner socket member 41 corresponds with the inner socket member of Fig. 2, with the exception that it employs a difierent style of screw thread and is formed at its outer end with a head 43 to receive a wrench or other applying tool, the inner socket member 41 not being fastened to the stud or bolt 40 by means of a pin, but intended for separate application to the sheet 10 and to receive the inner end of the stud or bolt 40, which is connected with the outer socket member 42 by a pin 44. I present Fig. 4 to indicate that the invent-ion is not limited to the special style of screwthreads shown in Fig. 2, nor, in every instance, to the connection of the inner socket member with the inner end of the bolt or stud by a pin. The ends of the stud or bolt 40 have a loose thread-connection with the socket members 41, 42, and hence-while being prevented from withdrawing from said members, may have an oscillatory action at one or both ends during the expansion and contraction of the sheets 10, 11.

In Fig. 5 I illustrate a portion of a modified form of stay-bolt structure, the modification consisting in utilizing a different style of thread on the end of the bolt or stud 45 and within the socket member 46 shown in Fig. 1, the end of the stud or bolt being threaded and tapered and having a loose thread-connection with the socket member, whereby said bolt may have an oscillatory action during the expansion and contraction of the boiler plates.

In all of the forms of the invention illustrated the ends of the stud or bolt have a loose thread-connection with the socket members, and may consequently have an oscillatory action therein, and in addition the staybolts shown in Figs. 1 and 2 may, in their entirety, be introduced through the outer shell or plate of the'boiler. I prefer that the ends of the stud or bolt be tapered so as to increase the extent to which said ends may oscillate within their sockets, but find that efficient results may be attained when the ends of the bolt and the inner walls of their sockets are parallel with and loosely engage each other, the ends of the bolt being less in diameter than the threaded sockets which receive them.

I do not limit the invention to the particular character of threads which may be out upon the ends of the stud or bolt and the inner walls of the socket-members, nor in every instance is the invention limited to the assembling of the stud or bolt and socketmembers prior to the application of the structure to position, but I deem it advantageous to assemble the parts, as shown in Figs. 1 and 2, and introduce the same through the outer shell or plate 11.

All of the socket-members will preferably be slightly tapered on their exterior so as to firmly wedge into their receiving holes in the sheets 10, 11. The socket 31 is tapered outwardly because it is screwed into the plate 10 from the inner side thereof, and the socket 41 is tapered inwardly because it is screwed into the plate 10 from the outer side thereof.

The loose thread-connection of the ends of the stud or bolt with the socket-members not only permits the oscillation of the bolt but the frequent movement of the threads on the bolt toward and from the internal threads on the sockets serves to cut away any sediment which might otherwise gather in the sockets and interfere with the flexibility of the stay-bolt structure.

What I claim as my invention and desire to secure by Letters Patent, is:

A flexible stay-bolt structure for connecting two parallel plates and engaging threaded alined holes in said plates, said structure comprising a stud threaded at both ends,

means securing one end of said stud to one of said plates, means securing the other end of said stud to the other plate comprising an integral internally and externallythreaded socket member adapted to the threaded hole in said other plate and having a solid outer end and being open at its inner end to receive one end of said stud, and a transverse pin extending through said socket member and the end of said stud and freely connecting said parts together so that without prejudice to the flexibility of the structure said socket member while carrying said stud may be passed to its seat in its plate and the free end of the stud screwed into its securing means at the other plate, said socket member having an interior bore of greater diameter than and engaging with its threads its end of said stud, whereby said socket member and said stud have a loose thread connection permitting oscillation of the stud; substantially as set forth.

Signed at Moncton, New Brunswick, Canada, this fifth day of July, 1907.

FREDERICK GEORGE HUNTER. Witnesses:

AUSTIN A. ALLEN, E. Ross HUNTER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0.

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