Improvements in Dentists' Seats.
Year: 1896

page_text: I FRANK BELL of Vilslaben, Tunbridge Wells in the County of Kent, do hereby
declare the nature of this Invention to be as follows:-
This invention relates to an adjustable seat to be used by dentists while
operating.
An arm either straight or curved is pivotted to the top of a standard fixed
to the floor or it might be to the operating chair or a wall. The arm carries a pawl
operated by a conveniently placed handle and engaging with teeth or holes on or
in a disc fixed to the standard or other support. A spring may be provided tending
to turn the seat out of the way when the pawl is lifted. At the end of the arm one
limb of a horizontal shaped rod is clamped in such manner that it can be
turned or moved to and fro and be secured in any position. The other limb of
the shaped rod has clamped to it the seat which is preferably similar to the
saddle of a bicycle. The clamp preferably consists of a divided sleeve carrying a
pair of jaws embracing a ball fixed to the seat a single screw being provided by
which the sleeve can be tightened on the rod and the jaws on the ball.
position of the seat therefore can be varied by turning the arm about its pivot,
by sliding the L shaped rod in its clamp or by moving the seat along the
Lshaped rod towards or from the pivot. The L shaped rod can also be turned
and its limb carrying the seat be made to point either towards or away from the
pivot. In this manner the position of the seat can be varied through a considerable
range.
The
Improvements in Dentists' Seats.
I, FRANK BELL, of Vilslaben, Tunbridge Wells, in the County of Kent, Surgeon
Dentist, 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:-
This invention relates to an adjustable seat for the use of dental surgeons and

page_text: zontal section on the line 2-2 of Fig. 1. Fig. 3 is a vertical section on line 3-3
of Fig. 2. Fig. 4 is a view of one of the parts carrying the seat pivot. Fig. 5
is a view of said seat pivot. Fig. 6 is a horizontal section on line 6-6.
A is a pillar having a base plate A' and suitable webs A2 A3 A3 of which the
former two are more extended than the last. This pillar A may be replaced by a 5
bracket projecting from the base of the dental or other chair in which the patient
sits, or from the wall. A is a flange on the piller A about midway of its height,
the upper face of this flange having on parts of its face (Fig. 6) recesses in the form
of ratchet or other teeth a, a. Above the flange A+ the diameter of the pillar A
is reduced to form a spindle for a sleeve B from one side of which there extends a 1
curved or straight frame or arm B carrying at its outer end a vertical socket B².
Through lugs 6 on the sleeve B there passes a rod C, the lower end of which is
adapted to engage the recesses a while the upper end is slotted to be engaged by
the arm C of the lever C3 pivoted on the frame or arm B a spring C³ tends to
press the rod C downwards into engagement with the recesses but such rod may 1
be lifted out of engagement with the recesses by movement of the lever C2 by
hand or by any equivalent arrangement to be worked by the foot thus leaving the
socket B free to be revolved on the pillar A.
M is a Spring to draw the arm 1 back when the pawl C is released. The
single recess a¹ forms a back stop for the arm when the seat is swung back out of 2
use.
The sleeve B is retained on the pillar A by the washer D and flange of the
screw D screwed into the upper end of the tubular pillar A.
There passes through the socket B2 the vertical limb of an L shaped rod E.
B3 is a set screw having its outer end formed as a lever for turning it by hand to
bear on the rod E after the latter has been adjusted vertically and rotarily. FF
represent a pair of blocks of which each carries in the centre a passage F (Fig. 4)
one of which is screw threaded and below the latter a transverse recess 1º, and
above the passage F a vertical recess F3 with a groove + when such blocks F F
are secured together by the screw G traversing the passages F the recesses F
form a socket for the horizontal arm of the rod E and the recesses F3 form a
socket for holding the pivot H of the seat J The pivot H has a ring H to engage
the groove F in the recesses F3. The blocks F thus together with the screw G
form a clamp in which after adjustment of the same upon the rod E, and of the
pivot H in the clamp, may be tightened by the screw G to firmly embrace the rod E
and the pivot H and hold both with the requisite friction.
There may be a groove on bar E and a feather or point in the socket F to
prevent slipping.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed I declare that what I
claim, is:-
1. A seat supporting frame comprising in combination a suitably supported
stationary pillar a socket rotarily movable thereon, a frame or arm extended
laterally from said socket a vertical socket in the outer end of said frame, a rod
having a horizontal arm and a vertical arm the former engaging in said last
mentioned socket, a seat, a vertical pivot thereunder, and a clamp adapted to
engage said pivot and also the horizontal arm of the rod aforesaid the whole
substantially as set forth.
2. A seat supporting frame comprising in combination a vertical pillar with a
base plate or a bracket thereto a flange on said pillar having recesses in its upper
face, a sleeve rotarily mounted on the upper part of said pillar above said flange,
a pawl on said sleeve adapted to engage the recesses in said flange, a lever for
disengaging said pawl, a frame extending laterally from said sleeve, a vertical
socket in the outer end of said frame, a rod having a horizontal arm and a vertical
arm the latter engaging in said socket, a seat, a vertical pivot thereunder, a pair
of blocks having counterpart recesses for said horizontal arin and pivot respectively

page_text: and a screw passing through one of said blocks and engaging the other block for
the purpose set forth.
3. The construction of seat with its supports and means of adjustment substan..
tially as herein described and illustrated for the purpose set forth.
Dated this 27th day of July 1897.
HERBERT HADDAN & Co.,
18 Buckingham Street, Strand, London, W.C., Agents to Applicant.