Year: 1888

page_text: Date of Application, 30th July, 1888
Complete Specification Left, 30th Apr., 1889
Complete Specification Accepted, 1st June, 1889
I HERBERT JOHN HADDAN of the Firm of Herbert & Co. Patent Agents of
18 Buckingham Street, Strand W.C. London in the County of Middlesex Civil
Engineer do hereby declare the nature of this invention a communication to me from
abroad by August Knöckelmann of Hanover in the Empire of Germany, Engineer
to be as follows:
--
The object of this invention is to construct a rotary stool, chair or the like so that it
may be adjustable in height but removable without altering the adjustment. To this
end in a suitable base frame having a central well is mounted in a step bearing an
extensible or telescopic tube carrying the seat. One part of this tube carries a ratchet
bar and the other a bell crank lever pivoted near to and extended under the seat and
terminating in one or more teeth adapted to engage with said ratchet whether by its
own weight or by a spring. The lower part of the tube is prevented from being
withdrawn from the well by a cross pin lying in a slot therein. The parts of the tubes
are prevented from relative rotation. A suitable brake may encircle the tube and be
operated by a cam or lever system to hold the tube in a fixed position if desired.
2000
HERBERT & Co.,
Agents to Applicant.

page_text: 3333 WCCA.
I HERBERT JOHN HADDAN of the firm of Herbert & Co. Patent Agents of
18 Buckingham Street, Strand W.C. London in the County of Middlesex, Civil
Engineer do hereby declare the nature of this invention, a communication to me from
abroad by August Knöckelmann of Hanover in the Empire of Germany, Engineer
and in what manner the same is to be performed to be particularly described and
ascertained in and by the following statement :-
The object of this invention is to construct a rotary seat, such as a music stool, office
stool etc. in such a manner that it may be adjustable in height and capable of being
revolved at any height without altering the adjustment.
A further object is to convert such seat at pleasure into a fixed seat.
To these ends the invention consists in the construction and combination of parts
hereinafter. described and particularly pointed out-in-the-claims, reference-being-made
to the accompanying drawings in which
Fig. 1 is a central vertical section of the improved seat on line AB Fig. 5. Fig. 2a
detail view. Fig. 3 is a section on line OP Fig. 1. Fig. 4 is a cross section on
line S T Fig. 2. °Fig. 5 is a cross section on line QR Fig. 1.
The seat consists essentially of two main parts a leg frame L supporting in a suitable
manner a central vertical hollow pillar M and secondly a seat E having a central
vertical and extensible spindle socketed in the hollow spindle aforesaid so as to revolve
therein, means being provided for the adjustment of the spindle to the required length
and consequently for the supporting of the seat at the height required, the limits of
height being of course dependent on the limits of adjustment of the spindle. In the
base of the hollow pillar M is a step or pivot bearing F and on the lower end of the
spindle is a pivot supported by said bearing. To prevent withdrawal of the spindle
from the pillar a pin X is passed crosswise through the pivot and projects beyond the:
faces thereof and an annular groove is made in the bearing for permitting the rotary
movement of the pin, suitable orifices being made in the wall of the bearing to permit
of the insertion of the pin X when constructing the seat or of the withdrawal thereof
if necessary. The construction of the spindle is as follows. It consists of two parts
firstly a hollow cylindrical sleeve B of diameter to fit easily in the metallic tubular
lining H of the well of the pillar and connected rigidly to the underframe A of the
seat proper E (as in the drawings representing a frame for a cane seat) secondly, of an
interior part or bar G carrying below the pivot aforesaid and extending upward within
the tube B in which it is adapted to slide. The shape of cross section of the bar G is
immaterial if it be other than circular as in the drawings; it is provided at suitable
places with reinforcements to bring it out to circular form for the better guiding of the
bar within the tube B, the bar G shown on the upper part thereof is of a U shape the
interior of the U being cut away or formed with a number of recesses, one above
the other to form a rack or ladder extending up the interior of the bar as in Fig. 2.
An angular lever C is pivoted in the upper part of the tube B so that its lower limb

page_text: projects down into the tube B and bar G and engages by means of a tooth or teeth on
Its lower end with the ladder aforesaid, its upper limb extending outward to near the
rim of the seat for convenient operation for disengagement of the teeth from the
ladder. The engagement of the lover is operated by its weight tending always to
bring the teeth into contact with the ladder; a spring may be arranged also for this
purpose. The tooth is formed as also the rungs of the ladder so as to prevent
accidental withdrawal either by upward or downward thrust when fully engaged. The
bar G is provented from rotary movement relative to and within the tube B by its
form the lever Cnicely fitting therein. Or for additional security a block Z fastened
to the tube B may engage upon the lower square part of the bar G. It will be under-
stood that the seat may be set at a convenient height by hand after releasing the
lever C and that it is there fixed by dropping the lever so that the tooth engages in the
rungs nearest thereto. In such position the tube B and bar G form an integral part
revolving together without relative displacement when the seat is turned.
To enable such a sent to be at any time fixed against rotation a suitable_device is
provided to fix the tube B in the log frame M. Such a device is shown in Fig. 1, K
being an annular block under the end of the tube B and set firmly on à circular part
of the part Z or otherwise and engaging in a vertical slot in a tube H. The annular
block is provided with a series of perforations to engage with the rod y guided in the
tube B when said rod is lowered by the lever connected to the upper end thereof.
Having now particularly described and, ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is
1. The combination with a supporting frame having a vertical hollow pillar, of a seat
having a vertical hollow tube fixed thereto, a bar rotarily socketted in said hollow
pillar, and sliding in said tube, a ladder in said bar and a two armed toothed lever
adapted to engage with said ladder for supporting the tube thereon at the height
desired.
2. The combination with a supporting frame having a vertical hollow pillar of a seat
having a vertical hollow tube fixed thereto a bar sliding in said tube a ladder on the
inner face of said bar, a two armed lever pivoted to said tube so that one arm extends
down the same, a tooth or teeth on said arm adapted to engage with said ladder, a
block fixed to said tube and engaging on a prismatic part of said bar for prevention of
relative rotation of the bar and tube, a pivot on said bar and a step bearing in said
hollow pillar for said pivot, an annular slot in said bearing and a pin traversing said
pivot and engaging in said annular slot.
3. The combination with a supporting frame having a vertical hollow pillar, of a
seat having a vertical spindle rotarily socketted in said pillar a perforated annular
block below said spindle, said block being provented from revolving, a rod y adapted
to engage with said block and a lever for operating said pin y for the purpose set
forth.
DALL .
11000