US 1498416 A
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A. H. WILLETT BOILER PLG June "i7 1924i., 1,498,416
- .Filed June l5.- 1921 2 Sheets-Sheet l y//// A \////l/ll Patented .lune 17, 192.
ALFRED H. WILLETT, 0F WEST NEW YORK', NEW JERSEY, ASSIGNOR T0 AMERICAN ARCH COMPANY, .A CORPORATION 0F DELAWARE.
- Application led June'l, 1921. Serial No. 477,625.
To aZZ whom t may concern:
Be it known that I, ALFRED H. WILLETT, a citizen of the United States, residing at West New York, in the county of Hudson and State of New Jersey, have invented certain new and useful Improvements inv Boiler Plugs, of which the following is a specification.
My invention relates to boiler plugs and the like, and my principal object is to make such plugs secure against accidental blowouts. Such blow-outs sometimes occur when leaky plugs of locomotive boilers are tightened up while theboiler is under quite low steam pressure, and are often fatal to the workmen engaged in tightening the plugs. My invention prevents accidents of this na ture,-even when boiler plugs are screwed so tight as to strip their threads.
How this and other advantages may be obtained through my invention will appear from my description hereinafter of the accompanying drawings, wherein,
Fig. 1 shows an axial cross-section through a boilerJ plug and, the associated parts by ywhich it is secured in accordance with my invention.
Fig. 2 is a similar view, showing a modification.
Fig. v3 is a similar view, showing another modification.
Fig. 4 is a similar view showing a further modifcation, the section being taken as indicated-by the line 4.-4 of Fig. 5.
y Fig. 5 is-a plan view of the construction illustrated in Fig. 4.-.
Fig. 6 shows a vertical longitudinal section through a locomotive fire box, showing the application of my invention to the throat sheet and the back head of the boiler, opposite the ends of a water circulation tube.
Fig. 7 is a cross-section illustrating my invention as employed in connection with a washout plug. p
In the device or construction shown in Fig. 1, the apertured element 10 inV which the plug is secured comprises a lip 12 formed integral with the boiler plate 13 or the like. This construction is, 1n general, stronger and more l.reliable than if the element v10 were formed as a separate and distinct part, so lthat I prefer it for new vboilersor boiler plates, where vit is practhe hole in the element 10. The plug means 11 shown in the aperture is. an externally threaded plug and is shown as of' the general form usual for boiler plugs, and as having the usual polygonal (squared) stub 16 for engagement by a wrench to turn the plug.A On the exterior of the lip 12 is screwed an internally threaded reinforcement member 17, in the form of a collar with an internal shoulder or Harige 18. The lower corner of this shoulder 18 1s conically bevelled, in conformity with the bevel of a triangular shoulder or flange 19 on the plug 11.
The plug 11 is secured to the-apertured element 10 even more strongly than boiler plugs are usually secured, by virtue of the extra extent of threaded engagement afforded by the opstanding lip 12. The reinforcement memberl7 is quite strongly secured to the element 10 around the plug 11, by virtue of the threaded engagement of said member 17 with the lip 12. When, therefore, the collar member 17 is screwed home till its shoulder 18 engages the plug at 19, the plug is doubly secured. 0n thekother hand, the collar 17 is also a means of additionally securing the plug 11 when the latter is tightened up Vin service.
for the purpose of stopping a leak. In such during stripping that will prevent any violent shock on the collar threads.
In the device or construction shown in Fig." 2, the apertured element 20 is a separa part, and the/lip 12 is integral with said element 20. At the root or base of the lip 12, the element 20 has an external flange 22. The portion 24 of the element 20 below the flange 22 is externally threaded and screwed into the hole in the plate 23. As an additional means :of securing the element corresponding to the externally threaded portion 24. The element 30 is secured to the plate 33 byrivets through the flange 32, as well as by welding 36 at the outer edge of the latter (as in Fig. 2) and also at the inner edge or lower corner 37 at the base of the lip portion. rllhe internal threads for engaging the plug 27 extend from the top of the lip clear down through the weld 37 and the plate 313. ln all other respects, this construction is like that shown in Fig. 2.
The construction shown in Figs. 4 and 5 closely resembles that of Fig. 1, but embodies a solid form of plug 41. rl`his plug 41 is provided with a shoulder 49 for engaging the collar shoulder 18 by the addition theretoof a locking member 50 of greater diameter than its own, in the form of a 'lat disc. rll`his disc member 50 has a circular opening to receive the plug stub 56. The plug means, therefore, is in this case composite, since the disc member 50 in effect forms part of the plug 41, and its outer portion 49 engages the collar shoulder 18 and secures the plug in the same way Vas does the triangular shoulder 19 of Fig. 1.
ln Fig. 6, the device of Figs. 4 and 5 is shown on the throat sheet 61 and the back head 62 of a locomotive lire box 63, opposite the ends of the circulation tubes 64 in the fire box. i
ln Fig. 7, the same device is shown applied as a washout plug, at the angle of the structure 70, just as washout plugs of ordinary construction are commonly applied.,
1. A plug device comprising, in combination, an apertured element; plug means in the aperture secured to said element and a ring-like reinforcement member detachably secured to said apertured element around said plug means and engaging the plug mesme lapertured element, said reinforcement permitting adjustment of the plug. v
3. A plug device comprising, in combination, an internally and externally screw threaded lip; vexternally threaded plug means screwed into said lip; and an internally threaded ring-like reinforcement member screwed upon said lip, for additionally securing the plug means therein,
said reinforcement permitting adjustment of the plug.
4. A-plug device comprising, in combination, an internally and externally screw threaded lip; externally threaded plug means screwed into said lip; and an internally threaded reinforcement member screwed upon said lip having a central opening leaving the plug accessible and an internal shoulder for engaging the plug means and additionally securing@ 5. A plug device comprising, in combination, an internally and externally screw threaded lip; an externally threaded plug member screwed into said lip with a locking member associated therewith, said plug members having wrench engagement means and an internally threaded reinforcement member screwed upon said lip and engaging said locking member to secure theplug member but leaving the plug accessible for adn justment.
6. A plug device comprising, in combination, an internally and externally screw threaded lip; an 4 externally threaded plug member screwed into said lip, with a locking disc of greater diameter than the plug member superposed thereon in `anti-turning engagement therewith; and an internally threaded reinforcement collar screwed upon said lip, therein.
ln testimony whereof, ll have hereunto signed my name. l
ALFRED ll. FNMT@ for additionally securing the plug l