Improvement in Guards or Covers for Wood-cutting or other Machinery.
Year: 1893

page_text: Date of Application, 7th Nov., 1893
Complete Specification Left, 9th Feb., 1894-Accepted, 10th Mar., 1894
PROVISIONAL SPECIFICATION.
Improvement in Guards or Covers for Wood-cutting or other
Machinery.
JOHN CAMPBELL, Cabinet Manager, 40 Kempster Street Lower Broughton
Manchester, FREDERICK THOMAS GREENWOOD, Joiner, 24 Croft Street, Lower
Broughton, Manchester do hereby declare the nature of this invention to be as
follows:-
Our invention relates to the construction of a guard or cover to be used for
the prevention of accidents, where revolving knives, teeth, or other cutters are
worked, either in wood working, or other machinery.
It is more especially adapted for an edging and surfacing machine known in
the cabinet & joinering trades as a Jacker.
The invention relates to a guard or cover that is adjusted for the prevention of
accidents during the process of either edging or facing.
The guard or cover is so constructed that it can be raised for facing so as to
allow various thicknesses of timber or other material to pass under, and to slide to
aud from the fence for edging purposes.
According to our invention the variation in height is given by means of a
dovetail or other slide and is adjusted and held in position by means of a thumb
screw or slot and thumb screw.
The top of the said slide is made to allow the cover to be attached by means
of flanged edges and closed ends which allows the cover to slide to and from the
fence as required for edging purposes and is held in position by means of a slot
in the cover and thumbscrew in top of the slide and this arrangement can all be
attached to the edge or pedestal of the machine so as to suit the different makers
construction of these machines.
Danamban Oth 1909
JOHN CAMPBELL,
40, Kempster Street, Lower Broughton, Manchester.
FREDERICK THOMAS GREENWOOD,
24, Croft Street, Lower Broughton, Manchester.
Improvement in Guards or Covers for Wood-cutting or other
Machinery.
We, JOHN CAMPBELL of 40 Kempster Street Cabinet Manager, and
FREDERICK THOMAS GREENWOOD of 24 Croft Street, Joiner, both of Lower
Broughton, Manchester 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 :-
This invention relates to a guard or cover for the prevention of accidents from
the rotary or revolving knives, teeth cutters and the like rapidly revolving parts
of wood working and other machinery in which the cutters teeth knives or the
like operate through a slot or opening formed in the bed or table of the machine.
It is particularly applicable to the edging and surfacing machine known, in the
ᎱᎠᎥᏁᏗ 1

page_text: wood-working trades as a
Jacker and we have illustrated such an application
in the accompanying drawings to which reference will hereinafter be made.
Applications of our improvements in other cases are similar and will be readily
understood from that described herein.
Figure 1 is a perspective view of the machine with the guard or cover applied
thereto.
Figure 2 is an end view, and
Figure 3 a longitudinal vertical section of the guard or cover constructed with
vertical and horizontal adjustments.
Figure 4 is a cross section of Figure 2 drawn to an enlarged scale.
Figure 5 is a front view and
Figure 6 an end view of a modified construction.
The construction and arrangement of the guard or cover may be varied in many
ways according to the character of the machine and of the work to be done. In
ordinary cases we prefer to construct it with both vertical and horizontal adjust-
ments as represented by the drawings, but in some cases the vertical adjustment
may be omitted.
When both adjustments are used, we may cast or fix upon the machine frame-
side or upon the pedestal a bracket or fixing such as A, constructed with guides
for the vertical support B, which may be secured in the guides by means of the
set-screw C. As shewn by Figures 1, 2 and 3, the face of the bracket A is dove-
tailed or under-cut and the vertically slotted plate B is correspondingly formed to
fit and slide therein. The set-screw C passes through the vertical slot in B, into
a tapped hole in the bracket, so that by tightening or loosening the set-screw the
vertical height of the guard which is carried upon the upper end of the plate, may
be adjusted at will. The upper end of the vertically adjustable plate B carries a
right angled extension D, upon which the guard E is carried. This guard is
preferred to be shaped to the segment of a circle in cross section and to have its
edges returned and fitted into recesses formed upon the under side of the bracket D,
as shewn by Figure 4. The recesses on the under side of the bracket thus form
guides for the sliding guard or cover. A longitudinal slot is formed along part
of the centre of the guard E and through this slot passes the set-screw F into a
tapped hole in the extension. The guard may thus be moved to a greater or less
distance across the table and be fixed by the set-screw F in any position.
The bracket or fixing A is secured upon the machine in such a position that
the guard comes precisely over and protects the rotary knives teeth or cutters.
The vertical adjustment permits the guard to be raised and lowered for surfacing
thicker or thinner boards G, or the like, whilst the horizontal adjustment permits
also thicker or thinner boards H to be run between the end of the guard and the
fence I for edging.
In some cases it is desirable to move the guard temporarily from above the
table to allow for rebating and the like, in which case we may employ the modifi-
cation represented by Figures 5 and 6. In this form the vertically slotted plate
is substituted by the circular rod B on which a flat or groove is formed, which
slides in the bearing J, in which a tightening screw is arranged. By means of
this screw the cover may be adjusted at any height above the top of the table,
whilst by loosening it, the guard may be turned at a right angle and be dropped
down below the level of the table top.
If no vertical adjustment be wanted, the support B or its equivalent may be
permanently or removably secured upon the machine side or upon the pedestal in
which the cutter spindle is borne.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is,―
A guard for wood cutting and similar machines consisting of a fixed or

page_text: adjustable vertical support B carrying at its upper end the adjustable cover E,
constructed and arranged substantially as hereinbefore described with reference to
the accompanying drawings.
Dated this 7th day of February A.D. 1894.
WILLIAM E. HEYS,
Agent for the Applicants.