Hydraulic Swivel. Page: 4 of 6
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810,315
though the latter part normally remains fixed
in the position shown. This function of the
antifriction-balls and grooved water-stem-is
of course not dependent on friction, as in
5 divers constructions heretofore in use rota-
tively connecting the water-stem to attach-
ments of the swivel-stem, but absolutely pro-
hibits any slip so long as the balls remain un-
broken.
[o To permit lubrication of the ball-bearings,
a shallow broad annular recess ha is left in the
under face of cap H opposite the upper. end
of -stuffing-box G and above the engaging
screw-threads g h'. A srew h3 normally
closes the- oil-inlet hole h4, the latter having
a screw-threaded annular wall and extending
down through the said cap to the lubricating-
space thus provided..
The stuffing-box G is much longer 'than.
ao those heretofore used for the same purpose.
Its interior is filled with a number of pack-
ing-rings or washers N, alternating with me-
tallic rings or equivalent partitions N', the
whole constituting an efficient composite.
25 packing-pile which snugly fits both the inte-
rior of the said stuffing-box and the exterior
of the said water-stem at all points,.longitu-
dinal as well as circumferential. The upper
end of the.-swivel-stem is in contact with the
30 lower plate- of this pile, and 'the turning of
said stem or the said stuffing-box tightens
the packing by compression, which the said
plates transmit with approximate equality
throughout the pile. Thus I am enabled to
35 apply a -much greater mass of packing effi-
cient in' all-its parts than would otherwise be
feasible.
The bearing-plates K and L 'are not in-.
closed by any other part and incur no risk
40 of peripheral friction therefrom. Plate K is
provided' outside of the antifriction-rollers
with a raised annular -flange k, fitting into an
annular groove l' in the lower face of plate L,
but not quite reaching the inverted bottom
45 of said groove, to avoid needless friction.
The bearing-plate.L is provided with a longer
annular flange 1, 'which overlaps the said
flange k and nearly the whole peripheral face
of plate L. These two flanges; with the in-
50 ner wall of-groove l', exclude dust and foreign
matter very effectively, but add practically'
nothing to the trouble or expense of casting
the said plates, being very simple in. form:
Each of these bearing-plates, of course, is'
55 provided with the usual groove having a
transversely-inclined bottom kI or 12, fitting
the conoidal antifriction-rollers 0, arranged
in circular series, the length of each roller
corresponding to the' width of the said
6o grooves. These rollers are large enough to
hold the central portions of the said plates
apart, leaving an annular space n for oil be-
tween the flange k and the water-stem.
This space is supplied through a fine duct o
65 from an annular oil-groove 0 in the top of.bearing-plate L, said groove being normally
covered by the nut M, and fed, while thus
covered, through a duct mT in said nut; The
upper part of the wall of this latter duct is
screw-threaded to receive a screw-plug m', 70
closing the same at will.
The trunnion-block B is in contact with
the upper end of a spacing and bracing sleeve
P, screwed at its lower end on the lower
threads d'~of swivel-stem D, and at said end 75
contiguous. to the screw -coupling Q, which
connects the said swivel - stem to the drill-
stem or drill' -tube R. This connection is
made by means of internal screw-threads q at
the upper end of the said coupling, engaging 8o
said threads d' of the swivel-stem, and exter-
nal screw-threads g' at the lower end of the
said coupling engaging internal screw-threads
r of the upper end of the .drill-stem. .The
said parts 'being tightened' by turning, the, 85
sleeve P is thereby clamped against the said
trunnion and with the-aid of the nut M holds
A the bearing-plates and their rollers securely.
in position. For lightness the interior of the
said sleeve is cut away around the swivel- 90
stem nearly from end to end, as shown at p2..
A blunt-headed screw S i.s turned through
thesaid sleeve nearits upper end against the
said ..swivel - stem;: and may be used 'when
needed to take.up wear,.said screw not being 95
turned tightly enough to impede the rota-
tion of the swivel-stem and drill-stem in bor-
ing.
The lower end of the swivel-stem is. pro-
vided withan internal recess T, surrounding 100
the water-stem E, -and the wall thereof is
screw-threaded at t in the mouth of said re-
cess.. A gland U, fitting said water-stem and
externally threaded, engages the threads t
and when turned- in compresses the packing 105
V of the said recess. The said gland is -pro-
vided with peripheral projections W, per-
mitting it to be turnedsby a wrench or equiv-
alent tool inserted through the lower end of
coupling Q. 10
The modification shown in Figs. 6 and 7
and the further modification shown in Fig.
8 make use of a collar X,,internally screw-
threaded at x and engaging screw-threads y
on the upper part of the water-stem E, the 115 .
stuffing-box G an'd cap. H, being provided
with two opposite annular recesses Y and Y',
. together forming an annular chamber or
raceway receiving said collar. This cham-
ber is both wider from inner to outer face 1o
and of greater measurement vertically than
said collar to leave oil-space at the periphery
of the latter and also under it. In the mid-
dle of the periphery of the said collar is an
annular groove z, receiving the inner parts of 125
the antifriction - balls I, the outer parts of
which above and below the center are re-
ceived, as .shown in Fig. 6, by grooves in the
stuffing-box and cap G' H', arranged and con-
structed as in Fig. 1, but located farther out- 130
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Wiggs, James A., Jr. Hydraulic Swivel., patent, January 16, 1906; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth509848/m1/4/?q=%22%22~1: accessed July 4, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.