Improvements in Metallic Bedsteads.
Year: 1898

page_text: I, SAMUEL ILSLEY WHITFIELD, of Watery Lane, Birmingham, in the County of
Warwick, Manager, do hereby declare the nature of this invention to be as
follows:-
My invention has for its object improvements in metallic bedsteads and refers
more particularly to the dovetail joint of those used for lunatic asylums where it
is necessary that the detachable junctions of the bedstead should be so fixed
together that it is impossible for any of the parts to be disconnected or removed
without the assistance of a tool and at the same time that there should be no
unnecessary projections.
of
In carrying my invention into effect a screw pin is chilled into the bottom
the dovetail projection and the lower end of the dovetail socket
is countersunk sufficiently to receive a tapped washer or' disc which
is screwed on to the pin and into the recess.
To securely effect this
so that the disc or washer cannot be removed by the fingers two holes or slots
are provided in the washer so that by means of a suitably shaped tool the washer
or disc can be screwed tightly home by which means the two parts of the junction
are secured together without any projecting pins or nuts, which therefore cannot
be unscrewed or removed without the assistance of the tool provided for the
purpose.
D 4.1
1
1000
Improvements in Metallic Bedsteads.
I, SAMUEL ILSLEY WHITFIELD, Managing Director of S. B. Whitfield and Co.,
Limited, of Watery Lane, Birmingham, in the County of Warwick, Bedstead
Makers, 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:
-
My invention has for its object improvements in metallic bedsteads and refers
more particularly to the dovetail joint of those used for lunatic asylums where it
is necessary that the detachable junctions of the bedstead should be so fixed
together that it is impossible for any of the parts to be disconnected or removed
Г 1)

page_text: without the assistance of a tool and at the same time that there should be no
unnecessary projections.
chilled into the bottom
of the dovetail socket
washer
disc which
In carrying out my invention a screw pin is
of the dovetail projection and the lower end
is countersunk sufficiently to receive a tapped
is screwed on to the pin and into the recess. To securely effect this
so that the disc or washer cannot be removed by the fingers two holes or slots
are provided in the washer so that by means of a suitable shaped tool the washer
or disc can be screwed tightly home by which means the two parts of the junction
are secured together without any projecting pins or nuts which therefore cannot
be unscrewed or removed without the assistance of the tool provided for the
purpose.
In order that my invention may be clearly understood and more easily carried
into practise I have appended hereunto a sheet of drawings upon which have
fully illustrated the nature of my said improvements.
Figure 1 is a general view of my junction looking up at it.
Figure 2 is a plan of junction connected together looking down at it.
Figure 3 is a sectional elevation of same.
Figure 4 is a similar plan to Figure 2 but looking up at it.
Figure 5 is a sectional elevation shewing junction disconnected.
Figure 6 is a view of nut and tool for operating same.
Figure 7 is a modified form of nut.
In carrying my invention into effect the screw pin A is chilled into the
dovetail projection B of the side K of the bottom and the lower end of the
dovetail socket C, which is formed on the chill E of the end M is countersunk or
recessed at c¹ sufficiently to receive the tapped washer or disc D) which is screwed
on to the pin A and into the recess until the washer bears against the
shoulders e of the chill E.
To securely effect this so that the disc or washer D cannot be removed by
the fingers two holes or slots are provided in the washer D so that by means of
a suitable shaped tool T the washer or disc D can be screwed tightly home
by which means the two parts of the junction E and F are secured together
without any projecting pins or nuts, and therefore cannot be unscrewed or
removed without the assistance of the tool T which is provided for the purpose.
I do not confine myself to the shape and configuration of the various parts here
shewn as I may alter them to suit the various requirements to be met with as for
instance the washer or nut 1) may be varied in shape as shewn by Figure 7 and
the tool to match. In some cases I may use an ordinary hexogon nut in which
case the operating tool would consist of a box spanner and the recess round the
pin would be made sufficiently large to receive it.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:-
In the junctions of the bottoms and ends of bedsteads; for lunatic asylums and
other such institutions the screw pin A mounted in the chill E in combination
with the nut D and tool T substantially as and for the purpose herein set forth
and shewn.