Improved Saw Set.
Year: 1892

page_text: Date of Application, 11th Feb., 1892
Complete Specification Left, 10th Nov., 1892-Accepted, 11th Feb., 1893
PROVISIONAL SPECIFICATION.
Improved Saw Set.
WILLIAM PERRY Humfrey Dove Street. Tool Merchant Norwich do hereby
declare the nature of this invention to be as follows:-
A machine worked by lever and reversible punch which do not require to be
taken out, to alter for different cut of tooth and guide to regulate depth of same as
required.
The punch is placed in a round socket with square hole in centre to admit punch,
the socket working in a cast iron holder which is screwed upon block of wood,
directly under the punch is a bevil piece of steel, upon which the saw is placed to
be set.
11
" n 1
1000
COMPLETE SPECIFICATION.
Improved Saw Set.
WILLIAM PERRY HUMFREY formerly of 13, Dove Street, Market Place
Norwich now residing at St. Johns Maddermarket Norwich in the County of
Norfolk, Mechanic formerly Tool Merchant 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 primary idea in this my invention for setting saw teeth is the use of a plunger,
piston, or punch which is square at the upper part and traverses a square hole in a
plate or framing, b, whilst its lower extremity is turned to slide in a round hole in
a plate, c, to be hereinafter described so as to maintain its uprightness. Upon the
sides of this plunger or piston, a, I make four different sized wings or snugs that is,
one upon each of the four faces of it. The plate, c, upon which the punch or
plunger abuts when down and in which is drilled the hole that steadies its lower
extremity in action, has its inner upper edge bevelled to an angle suitable for the
setting of saw teeth. The four wings of the punch are likewise bevelled to fit the
same angle so that when any one of the sizes are used, the other three are only
moving in air and are out of contact with anything else. When desired to use
another size it is only necessary to lift the punch out of its bearings and drop it
back again either at one quarter, one half or three quarters of a turn of it, so as to
bring the desired size of wing upon the bevelled edge of the striking plate. This
is, so that rip, half-rip, handsaw and tenon-saw or other saw teeth may be operated
upon with one punch."
At the upper part of one side of the small framing, b, which carries the plunger
is a hinge for the fulcrum of a lever K and this lever is recessed to fit upon and over
the rounded head of the plunger. This lever can be thrown over so as to leave the
head of the plunger free for using thereon a hammer, as shewn in Figs. 1 & 3, or it
may be depressed to act by hand pressure rather than by a blow when in the position
shewn in dotted line in Fig. 1' its free end being formed into a handle. The
bevelled striking-plate is fitted flush into a block, d, which is of such dimensions as
to be conveniently fixed in a bench screw or vice and is fitted with two points of
two metal slides e e e e, slotted for fastening to the block with screws, and which are
adjustable laterally and longitudinally in order that by fitting into any two serrations
of the saw the same size of pitch may be maintained, and the punch be made to fall
true upon every other alternate tooth on one side, and the intermediate ones on the
Paine 871

page_text: other side, when turned end for end. A fence, f, actuated by a thumbscrew m, as
shewn in Fig. 4 regulates the depth to which the saws enter so that the bevel of
each tooth shall commence throughout the whole length at the same line of pitch,
i.e. the same exact distance from the points of the teeth. The rise of the plunger
automatically, is obtained by inserting in the block immediately under the hole in
the striking-plate, c, a spiral spring, 9, carrying a small rivet-shaped head-plate, i,
upon which the foot of the plunger rests; after each depression during which the
spring is compressed, as soon as the pressure thereon is released or the blow has
been struck the spring regains its freedom and raises the plunger to its highest
position ready for the next pressure or blow. By these or other equivalent
mechanical means I regulate the size of the bevel of the teeth the distances apart
on the saw of the blows or of the bending by pressure the equality of the set and
the rising of the plunger after each operation.
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 :
1. The use, for four different sizes of saw teeth, of one plunger, square sided,
working in a square hole when combined with four wings formed thereon of different
sizes for the purpose of setting saw teeth.
2. The supporting of the plunger also at its foot so as to ensure its uprightness
for setting saw teeth when used in combination or conjunction with the improved
B&W set.
3. The use of one plunger for the two-fold operation of being actuated either by
a hammer or by a pressure-lever, at will-for setting saw teeth in conjunction with
the above improved saw set only.
4. The use of adjustable pointed slotted plates, in conjunction with a movable
fence for regulating the intervals upon the saw, of the repetition of the blows or
pressure at each operation, substantially as described and shewn in the drawings
and in combination or conjunction with the above improved saw set only.
5. The use of a bevelled striking-plate in conjunction with the bevelled-parts or
wings of plunger.
6. The conjoint use of all or any of the above means for the setting of saw teeth
provided they are in combination with the above saw set.
Dated this 10th day of November 1892.
14
JOHN BLAVA,
Agent for Applicant.