US1202704A - Expansion bolt and plug. - Google Patents

Description

G B. GOFF. EXPANSION sou AND PLUG. APPLICATION FILED AUG.23| IQIB- 1 9 Patented Oct. 24, 1916.

w /vvv///// m GEORGE B; GOFF, OF JOHNSTOWN, PENNSYLVANIA.

EXPANSION BOLT AND PLUG.

Specification of Letters :Patent.

Patented Oct. 2st, 19108.

Application filed August 23, 1916. Serial No. 116,465.

To all whom it may concern:

Be it known that I, Gnoncu B. Gore, a citizen of the United States, residing at Johnstown, in the county of Gambria, State of "Pennsylvania, have invented certain new and has specialjreference to an expansion.

bolt and plug for use in connection with tubular boilers. I

It is a Well. recognized fact among the users of tubular boilers that such boilers frequently leak by-reason of their tubes giving away or'the connections between the tube and tube sheet becoming loose. In the first instance, it is necessary to replace the tube but at times it'is inconvenient to replace the tubes on account of the boiler being in service so that such replacements are preferably put off.

One important object of the invention is to'provide an improved expansion bolt and plug for use in connection withsuch tubes so that both ends of'the leaky tube may be closed if desired, thus enabling the boiler to continue in'use until a convenient time is found for repairs. g

In the second instance, wherethe leak occurs around the connection'between the tube and the flue sheet it is necessary to reexpand the tube at this point and probably to rebead such tube. This also'requires shutting down of the boiler and a second important object of the invention is to provide means which will avoid this shutting down at inconvenient times by providing an expansion bolt and plug, which plug'will fitin the mouth of the tube and by reason of its tapering formation force the wall of the tube firmly into engagement with the opening in the tube or flue sheet so that no leakage can take place.

With the above and other objects in view, as will be hereinafter apparent the invention consists in general of certain novel details of construction and combinations of parts hereinafter fully described, illustrated in the accompanying drawings, and specifically claimed.

In the accompanying drawings, like characters of reference indicate like parts in the several views, and Figure 1 is a section through a portion of a flue or tube sheet and a boiler tube or flue showing the device applied thereto. Fig. 2 is a longitudinal section throughthe device. Fig. 3 isa section on the line 3-3 of Fig. 1; Fig. i is a detail perspective ofone of the pivoted members of the expansion bolt.

In carryingout the objects ofthis 111VG11- tion-there is provided a body 10 having a threaded opening 11 extending centrally therethrough. At diametrically opposite points this body is also provided with recesses 12 and through these recesses pass pivot pins 13whereto are pivoted the reduced ends 1% of expansion members 15 having their confronting faces formed with grooves 16 angularly disposed with reference to each other.

At 17 1s a rod which has 1ts inner end threaded as at 18 andthis threaded end is screwed through the opening 11. Formed on or securedto this rod is a frusto-conical portion 19 which fits between the members 1:") in the grooves 16. Therod extends outwardly from this portion 19 and has its outer end also threaded asshown at 20. On this threaded outer end is slid-ably mounted a frusto-conical plug 21 which is of .such size as to fit closely in the mouth of a flue such as is indicated at A so that when the plug is forced into the mouth the wall of the flue will be spread and fit closely in the flue opening. ofa flue sheet 13. Resting against the outer end ofthe plug 21 is an asbestos washer 22- which is stoppedby a metal washer 23 against which engages the inner face of a nut 24L.

In order to prevent any movement of the expansion member each of the members 15 is provided with spaced ribs 25 having sharpened biting edges as indicated at 26, these biting edges engaging the inner surface of the wall of the flue A when in position.

In the operation of the device the expansion member or inner end is placed within the tube and the rod 17 rotated so that the portion 19 is forced between the members 15. This causes these members to spread apart and thus the edges 26 will bite into the inner face of the wall of the flue. hen these edges are engaged with the flue in this way the plug 21 is placed on the member 17 together with the washers 22 and 23 and then the nut 24 is screwed up on the member 17 so that the plug is forced will be obvious that under this construction,

as shown in Fig. 1, the mouth of the flue will be forced firmly outward so that the fiue wall will engage the opening in the flue sheet. It will also be obvious that if the flue leaks between its ends it is merely necessary to apply one of these devices to each end of the leaking flue whereupon the leakage from thewater space of the boiler into the flue will simply accumulate in the latter without working any injury other than reducing the heating surface of the boiler slightly. Thus, whenever the flue leaks, either intermediate its ends, or at its connection with a flue sheet the device may be applied without shutting down the boiler so that the latter can be continued in operation until a convenient time for shutting down occurs, when permanent repairs will be effected.

There has thus been provided a simple and eflicient device of the kind described and for the purpose specified.

It is obvious that many minor changes may be made in the form and construction of the invention without departing from the material principles thereof. It is not therefore desired-to confine the invention to the exact form herein shown and described but it is wished to include all such as properly come within the scope claimed. Having thus described the what is claimed as new, is

1. In a device of the kind described, a body having a threaded opening, a pair of members hinged to the body and having angularly disposed confronting faces, a rod invention,

copies of this patent may be obtained for five cents each, by addressing the having one end threaded and screwed into said opening and having a frusto-conical portion fitting between said confronting faces, and oppositely disposed arcuate ribs formed on the free ends of the pivoted members and provided with sharpened biting edges engageable with the inside of a flue.

2. In a device of the kind described, a body having a threaded opening, a pair of members hinged to the body and having angularly disposed confronting faces, a rod having one end threaded and screwed into said opening and having a frusto-conical portion fitting between said confronting faces, oppositely disposed arcuate ribs formed on the free ends of the pivoted members and provided with sharpened biting edges engageable with the inside of a flue, a plug mounted -on the remaining end of the rod and means to force the plug toward said body.

3. In a device of the kind described, a body having a threaded opening, a pair of members hinged to the body and having angularly disposed confronting faces, a rod having one end threaded and screwed into said opening and having a frusto-conical portion fitting between said confronting faces, oppositely disposed arcuate ribs formed on the free ends of the pivoted members and provided with sharpened biting edges engageable with the inside of a flue, the remaining end of the rod being also threaded with the thread of the same hand as first thread, a tapered plug slidably mounted on said last-mentioned end, and a nut screwed onto said last-mentioned end and forcing said plug inwardly.

In testimony whereof, I afiix my; signature in the presence of two witnessesgg' GEORGE E. GOFF. I

, Witnesses:

V. J. BRADDOCK, JACOB LIHMAN.

Commissioner of Patents,

Washington, D. O.

Images