Improvements in Apparatus for Making Wooden Boxes.
Year: 1887

page_text: Improvements in Apparatus for Making Wooden Boxes.
I, HENRY CAMPBELL, of 19 Soho Square, in the County of Middlesex, 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, reference being had to the accompanying sheet of Drawings and to the
letters and Figures marked thereon, that is to say:
This invention relates to improvements in apparatus for making wooden boxes
for which Letters Patent were granted to William Phillips Thompson bearing date
the 2nd October 1883 No. 4686. In the apparatus described in the Specification of
the said Patent and illustrated in the Drawings annexed thereto the clamp-bar abut-
ments against which the timber to be operated upon is held and which are marked e
in the said Drawings are fixed to, or formed solid with, the upper parts of the frames
by which they are carried. That arrangement is simple and is sufficient when it is
only required to cut mitres and dovetail grooves and tongues on boards intended for
making into boxes with sides and ends of equal thickness, but when it is required to
operate on boards of different thicknesses for the same box, as in the case of drawers
for example wherein the fronts are generally made of thicker material than the sides
and backs, it is necessary to either use two separate machines or to adjust the
cutters of the same machine to suit each thickness of wood employed, or to make the
clamp-bar abutments adjustable vertically in the frames carrying them.
The object of my present invention is to provide efficient means for the adjustment
of the clamp-bar abutments vertically into various positions to suit various thicknesses
of wood and for holding them in place when so adjusted.
The Drawings hereto annexed illustrate so much of an apparatus of the kind
above referred to as is necessary to enable me to explain my present invention as
applied thereto. Figure 1 is a sectional elevation and Figure 2 is a plan.
e e represent the clamp-bar abutments which instead of being fixed to or formed
solid with the upper parts d d of the frames B B are adapted to slide vertically in
grooves 38 or other suitable guides therein or thereon; flanges 39 formed on the
clamp-bar abutments e e afford means of fixing or clamping the bars e at any required
height by means of clamping screws 40 which pass through slots 41 in the parts d d
D

page_text: and are tapped into the flanges 39, or which pass through similar slots in the
flanges 39 and are tapped into the parts dd, or the clamping screws or bolts may be
otherwise arranged. The rocking shafts 42, turn in holes or bearings in the parts d d
and each carries secured on it two arms 43 with forked ends which take on to studs 44
fixed in the flanges 39. The arms 43 are prolonged backwards and terminate in lever
handles 45, or, if preferred, one or more such lever handles may be secured on any
other suitable or convenient part of the rocking shaft. The object of the rocking
shaft 42 and its arms 43 is to secure that both ends of the bars e shall be raised or
lowered to the same extent, that is that the said bars shall always move parallel to
themselves when adjustment has to be made.
It will now be understood that when it is desired to adjust the bars e into new
positions it is only necessary to slacken the clamping screws 40, to raise or lower the
bars e by the lever handles 45 into the required position which may be determined by
a scale marked on the parts or otherwise, and then to tighten up the clamping
screws 40. The clamp bar 34 is adjusted to suit the various thicknesses of timber by
means of the thumb-nuts 46 on the bolts e² which bolts pass through the cain-bar e¹
all as in the apparatus described in the aforesaid Specification of W. P. Thompson.
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 we claim is :-
The adjustable clamp-bar abutments in combination with means for securing that
both ends of the said clamp-bar abutments shall be raised or lowered to the same
extent and with means for clamping the said clamp-bar abutments in place in or on
the frames carrying them, as hereinbefore described, and illustrated in the Drawings
hereto annexed and for the purpose specified.