Improvements in Revolving Chairs.
Year: 1895

page_text: Date of Application, 23rd Apr., 1895-Accepted, 24th May, 1895
COMT PELE DETTALION
Improvements in Revolving Chairs.
A communication by JAMES MILLARD MORGAN, of Port Washington, in the
County of Ozaukee, in the State of Wisconsin, United States of America,
Manufacturer.
I, WILLIAM PHILLIPS THOMPSON F.C.S., M.I.M.E., of The Agency for
Foreign Patent Solicitors 6 Lord Street, Liverpool, and 6, Bank Street,
Manchester, both in the County of Lancaster 118 New Street, Birmingham in
the County of Warwick and 31 High Holborn in the County of Middlesex,
Civil Engineer, do hereby declare the nature of this invention and in what
manner the same is to be performed, to be particularly described and ascertained
in and by the following statement :-
The invention relates to improvements in a revolving chair in which the seat is
provided with a fixed depending spindle, said seat being adjustable vertically by
means of a screw on the spindle turning by its thread in a nut freely revoluble in
a hub, the nut being supported on a sleeve which in turn is supported and freely
revoluble in the hub.
In the accompanying drawings,
Figure 1 is an elevation of the improved devices, the chair hub being shown in
central vertical section.
Figure 2 is a vertical section on the line 2-2 of Figure 3.
Figure 3 is a horizontal section on the line 3-3 of Figure 2, and
Figure 4 is a detail plan view of the sleeve.
Like letters of reference denote like parts in all the figures of the drawings.
Referring to the drawings, the letter A indicates the metal hub, which is so
constructed as to receive the upper ends of legs B, on which it is supported. The
hub is provided with a central vertical aperture, and a shoulder C is formed
preferably near the lower end of said aperture. Resting upon this shoulder is a
sleeve D, and upon the upper edge of this sleeve rests a nut F, said nut extending
above the upper end of the hub, and provided at its outer extremity with a hand
wheel G. The lower edge of the nut is provided with a projection H, which is
adapted to fit releasably in a corresponding depression H¹ in the upper end of the
sleeve D. The nut is further provided at a medial point within the central aperture
of the hub with an annular groove K, which groove is adapted to receive the inner
end of a set screw L working laterally through the hub. It will be noticed that
this groove is sufficiently wide to permit of a vertical play of the nut equal to the
vertical extent of the projection H.
The sleeve D is provided with an inwardly projecting lug M which fits into a
longitudinal groove in the spindle E, thereby hulding the sleeve to the spindle
rotatably, while permitting independent vertical movement of the spindle.
The sorew-threaded spindle E depends from the chair seat (not shown) to which
it is fixed, conveniently by a suitable flange on the head O.
In operation when the chair seat is revolved by the occupant of the chair, the
screw carries with it the sleeve D, by reason of the lug M engaging the walls
of the groove N, while the sleeve D supported and revolving freely in the hub,
carries with it the nut F, by reason of the releasably engaging projection H of
said nut. It follows therefore that the nut is normally held revolubly to the screw,
and consequently there is no vertical movement at all, although the free rotation
of the chair seat is secured. If, now, it is desired to adjust the chair seat

page_text: vertically, said chair seat is held against rotation with one hand, while the other
hand grasps and rotates the nut G. The forcible rotation of the nut carries the
projection H out of the recess H¹, and said projection rides around on the upper
edge of the sleeve D. With the continued rotation of the nut, the screw E is
either raised or lowered, in accordance with the direction in which said nut is
turned. The screw L while permitting the free rotation of the nut, at the same
time serves to hold it against undue vertical movement.
It will be seen that by these improvements all the several parts are disposed
within the central aperture of the hub obscured from view, while the shoulder C
forms a strong support for the working parts. The hand wheel G of the nut is
also, by this arrangement, disposed in a most convenient position for ready
manipulation.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, as communicated to
me by my foreign correspondent, I declare that what I claim is :-
1. The combination with a hub having a vertical aperture, of a sleeve supported
and freely revoluble therein, a nut supported on and releasably engaging the
sleeve, a screw-threaded chair-spindle extending through the nut and the sleeve,
the screw of the nut engaging the screw of the spindle, and means holding the
sleeve to revolution with the spindle, while permitting vertical movement of
the spindle in the sleeve, substantially as described.
2. The combination with a hub provided with a vertical aperture therethrough,
the upper portion of said aperture being enlarged forming a shoulder at the lower
extremity of the enlarged portion of the aperture, of a sleeve fitting in the
aperture and resting revolubly on the shoulder, said sleeve being provided with a
depression in its upper edge, a nut supported movably on the sleeve and provided
with a projection fitting the depression in and thereby releasably engaging the
sleeve revolubly, and means for forcibly rotating the nut and thereby disengaging
it from the sleeve, substantially as described.
3. The combination with a hub provided with a vertical aperture therethrough,
the upper portion of said aperture being enlarged forming a shoulder at the lower
extremity of the enlarged portion of the aperture, of a sleeve fitting in the aperture
and resting revolubly on the shoulder, said sleeve being provided with a depression
in its upper edge, a nut supported movably on the sleeve and provided with a
projection fitting the depression in and thereby releasably engaging the sleeve
revolubly, means securing the nut to the hub revolubly therein, and means above
the hub for rotating the nut forcibly and thereby releasing it from the sleeve,
substantially as described.
4. The combination, with a hub provided with a vertical aperture therethrough,
the upper portion of said aperture being enlarged forming a shoulder at the lower
extremity of the enlarged portion of the aperture, of a sleeve fitting in the aperture
and resting revolubly on the shoulder, said sleeve being provided with an inwardly
extending lug and in its upper edge with a depression, au interiorly screw-threaded
nut supported movably on the sleeve and provided with a projection fitting in the
depression in and thereby releasably engaging the sleeve revolubly, means securing
the nut to the hub revolubly therein, and a screw threaded spindle extending
through the nut and the sleeve, said spindle being provided with a vertical groove
into which the lug on the sleeve projects thereby compelling concurrent rotation
thereof but permitting independent vertical movement of the spindle, the screw_
thread on the spindle engaging the screw of the nut, substantially as described.
Dated this 2nd day of Anril 1895