Improvements in the Lock-operating Mechanism of Adjustable Combination Chair and Rocker.
Year: 1890

page_text: Date of Application, 12th Apr., 1890
Complete Specification Left, 1st Jan., 1391-Accepted, 7th Feb., 1891
PROVISIONAL STECIFICATION.
Improvements in the Lock-operating Mechanism of Adjustable
Combination Chair and Rocker.
RIDLEY JAMES URQUHART, of 57 Keppel Road, Chorlton-cum-Hardy, in the
County of Lancaster, Engineer, do hereby declare the nature of this invention to
be as follows:-
The object of this invention is to provide improved means for operating the bolts
or catches supporting the adjustable combination legs and rockers of juvenile chairs,
in any desired position.
The rockers of said combination are usually formed in halves and hinged at
centre of chair, said rockers also forming legs when their extremities are contracted
radially. Two horizontally sliding bolts or catches for locking said legs or rockers
in position are usually employed, and pass through underframe into socket in.
rocker, the two halves forming said rocker radiate in unison by suitable means
provided therefor.
In carrying out my invention, I employ a vertical rigid frame which I mount in
guides to slide, or to swing in bearings in underframe of chair.
The vertical frame has two projecting handles at its upper portion for the purpose
of giving motion thereto in operating the bolts.
The lower portion of said frame is formed to engage with and operate said sliding
bolts or catches by means of inclined grooves or slots in conjunction with shoes or
sliding pieces engaging therein, said slots or grooves being formed in frame, and
bolts prepared to engage therewith; or said bolts may be slotted or grooved
angularly and frame formed in a corresponding manner to engage.
A spring is employed in conjunction with frame to keep it in the desired position.
Dated this 11th day of April 1890.
RIDLEY JAMES URQUHART.
COMPLETE SPECIFICATION..
Improvements in the Lock-operating Mechanism of Adjustable
Combination Chair and Rocker.
RIDLEY JAMES URQUHART, of 57 Barton Arcade, Manchester, in the County of
Lancaster, Mechanical Engineer, late of 57 Keppel Road, Chorlton-cum-Hardy, in
the County of Lancaster, 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 object of this invention is to provide improved means for operating the bolts
or catches supporting the adjustable combination legs and rockers in the desired
position.
Each rocker consists of two halves which form also legs or supports, each pair of
half rockers or supports are hinged to the underframe at either side. In adjusting
the height of the chair the rockers or supports radiate in unison, each pair in
opposite directions by suitable means provided therefor. Two horizontal sliding
bolts shooting into sockets in the rockers are usually employed and operated by
mechanism in various ways.
According to my invention the bolts are operated by a transverse movement of a
or lever which directly engages with the bolts and effects their movement
through inclined slides or surfaces arranged at places of contact.
"frame
The accompanying sheet of drawings illustrates the methods which appear to me
C

page_text: most practicable, of carrying my invention into effect. The inclined slides are
shewn as formed on the bolts, but I may reverse the order and apply the inclined
slides to the "frame" or lever, forming the bolts in suitable manner to engage
therewith.
::
Referring now to the said drawings
27
Figure 1. illustrates a movement made according to my invention in which the
bolts are operated by a swing "frame or inverted lever. (A) (A) indicate the
"frame" pivoted in bearings (B) (B) which are affixed to the underframe of
the chair. (a) () is the usual form of sleeve carrying the bolt, and is also attached
to the underframe. The bolts (C) (C) are formed with heads having inclined slots
or slideways formed therein and arranged as shewn in Figure (1). A spiral spring ()
attached to an arm on the "frame" as shewn or in other suitable inanner, is provided
to retain the bolts in one position.
Figure 2. represents an alternative arrangement carried out according to this
invention. Similar letters of reference apply to the corresponding parts in both
figures. In this arrangement the frame is formed to slide vertically in guides (d)
(d) (d) (d) affixed to the underframe of the chair.
The inclined slots or slideways of the holts (C) (C) are set vertically as shewn,
the frame being formed with nipples (c) (c) thereon to engage and slide in the
slots.
The springs () () may be arranged as shewn or in other suitable manner.
The springs hold the fingers or nipples () () at one end of each slot, the bolts
being home in the sockets. The handles () () are set at their lowest positions.
By raising the handles the right-angled transverse movement of the fingers or
nipples in the slots or inclined slide-ways of the bolts effects the movement thereof.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
In an adjustable chair the employment of a sliding or swinging "frame" or lever
operating bolts in a transverse direction to its movement by means of inclined
slides substantially as described and indicated hereinbefore and in and by the
accompanying drawings.
Dated this 31st day December 1890.
RIDLEY JAMES URQUHART.