Improvements in Reciprocating Saw Frames or Machines.
Year: 1890

page_text: Date of Application, 23rd June, 1890
Complete Specification Left, 23rd Mar., 1891-Accepted, 25th Apr., 1891
.
PROVISIONAL SPECIFICATION.
Improvements in Reciprocating Saw Frames or Machines.
I, JULIO E. VASSAUX, of Guatemala, Central America, do hereby declare the
nature of this invention to be as follows:
The object of this invention is to reduce in a great measure the loss of power and
the wear of the saw blades and it essentially consists in imparting to the saw blades
a combined motion whereby the teeth while inoperative are caused to move out of
contact with, but parallel tc, the bottom of the saw cut, while in exercising their
action they are brought with the due degree of pressure against the bottom of the
cut the blades being whether in or out of contact with the material, constantly
maintained in a vertical position and parallel to the direction of the cut.
This result can be obtained in different ways, one form of mechanism fulfilling
this purpose being hereinafter described as an example.
A lever or arm is provided with an anti-friction roller which is held in engage-
ment with a cam secured to a crank shaft and half of whose circumference is cut away
so as to act as an eccentric and impart to the lever an oscillating motion corresponding
in duration to the reciprocations of the saw blades. This lever is secured to a
horizontal shaft to which it transmits its motion and which turns freely on its axis
having its bearings in the two side frames of the machine. To one end of this
horizontal shaft is secured a second lever arm connected by a rod to a similar lever
secured to a lower shaft corresponding to the before mentioned horizontal shaft and
also supported by the side frames of the machine. Upon each of these two horizontal
shafts are secured two similar lever arms (in all four, all alike) cach provided with
a crank pin to which is pivoted the supporting frame whereon in the same way as
in ordinary machines of this class another blade holding frame is adapted to slide.
The before mentioned horizontal shafts pass through slotted openings provided
in the sides of the supporting frame these openings being of such length as to enable
the latter to move the desired distance in a horizontal direction say from 10 to
20 millimetres which motion is imparted by the before described parts.
Springs are attached at one end to extensions integral with the side frames of the
machine while their opposite ends are connected with the frame each by a screw
bolt provided with a nut. These springs constantly have a tendency to pull the
said frame back from the material being sawn.
The operation of the machine is as follows:-
When the saw is in a working position i.e. when the saw blades are brought
against the surface of the article to be cut the cam presses with its part having the
largest radius upon the first operated lever or lever arm which through the medium
of the other levers and rods connected therewith acts upon the before mentioned
supporting frame so as to displace it horizontally and in a parallel direction to the
blade holding frame or carriage whereby the teeth of the saw are brought up to
and pressed against the part it is desired to cut during the whole of the descent of
the blade holder, the shape of the eccentric cam being proportioned accordingly.
When this downward motion of the saw is completed the projecting or concentric
portion of the cam comes out of contact with the lever which is thus relieved from
pressure. This permits the before mentioned springs to exert their influence in the
opposite direction so as to pull back the supporting and blade holding frames in
such manner that the teeth of the saws are disengaged from the bottom of the
cuts. This is effected by the flat portion of the cam acting upon the first operated
lever during the whole of the upward motion of the blade carrier. It will be
understood that the other intermediate or connecting parts will follow this
retrograde motion. The moment at which the blade carrier completes its upward

page_text: stroke and that at which the cam is again brought to the position in which its
concentric or projecting part can act upon the lever it operates coincide, so that the
teeth of each saw are again forced against the bottom of the cut the whole operation
as above described being repeated.
This mechanism is applicable to every species of vertically reciprocating saws it
being immaterial whether the crank shaft is arranged at the upper or lower part of
the machine; it is sufficient in each case to modify the size and shape of the levers
according to the requirements of the work.
Dated this 23rd day of June 1890.
W. P. THOMPSON & BOULT,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Reciprocating Saw Frames or Machines.
I, JULIO E. VASSAUX, of Guatemala, Central America, 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 reduce in a great measure the loss of power and
the wear of the saw blades and it essentially consists in imparting to the saw blades
a combined motion whereby the teeth while inoperative are caused to move out of
contact with, but parallel to, the bottom of the saw cut, while in exercising their
action they are brought with the due degree of pressure against the bottom of the
cut the blades being whether in or out of contact with the material, constantly
maintained in a vertical position and parallel to the direction of the cut.
This result can be obtained in different ways, one form of mechanism fulfilling
this purpose being as an example hereinafter described and illustrated in the accom-
panying drawings in which
Fig. 1 is a front elevation of said mechanism.
Fig. 2 is a section on line A 13 of Fig. 1 and
Fig. 3 a side elevation.
A lever or arm A Figs. 1 and 2 is provided with an anti-friction roller which is
held in engagement with a cam G secured to a crank shaft X and half of whose
circumference is cut away so as to act as an eccentric and impart to the lever an
oscillating motion corresponding in duration to the reciprocations of the saw blades.
This lever A is secured to a horizontal shaft B to which it transmits its motion and
which turns freely on its axis having its bearings in the two side frames C C³ of
the machine. To one end of this horizontal shaft B is secured a second lever arm H
connected by a rod D to a similar lever E secured to a lower shaft F corresponding
to the before mentioned horizontal shaft B and also supported by the side frames C C
of the machine. Upon each of these two horizontal shafts Band F are secured two
similar lever arms (in all four all alike) cach provided with a crank pin to
which is pivoted the supporting frame whereon in the same way as in ordinary
machines of this class another blade holding frame L L is adapted to slide.
The before mentioned horizontal shafts B and as shown in Fig. 2 pass through
slotted openings provided in the sides of the supporting frame these openings
being of such length as to enable the latter to move the desired distance in a
horizontal direction say from 10 to 20 millimetres which motion is imparted by the
before described parts.
Springs N N are attached at one end to extensions integral with the side
frames CC of the machine while their opposite ends are connected with the frame J
each by a screw bolt provided with a nut. These springs constantly have a tendency
to pull the said frame back from the material being sawn.
The operation of the machine is as follows :-
When the saw is in a working position i.e. when the saw blades are brought
against the surface of the article to be cut the cam C presses with its part

page_text: having the largest radius upon the first operated lever or lever arm A. which through
the medium of the other levers i "E and H and rods G acts upon the before
mentioned supporting frame J so as to displace it horizontally and in a parallel
direction to the blade holding frame or carriage whereby the teeth of the saw are
brought up to and pressed against the part it is desired to cut during the whole of
the descent of the blade holder, the shape of the eccentric cam being proportioned
accordingly.
When this downward motion of the saw is completed the projecting or concentric
portion of the cam G comes out of contact with the lever A. which is thus relieved
from pressure. This permits the before mentioned springs N to exert their influence
in the opposite direction so as to pull back the supporting and blade holding frames
in such manner that the teeth of the saws are disengaged from the bottom of the
cuts. This is effected by the flat portion of the cam Gacting upon the lever A
during the whole of the upward motion of the blade carrier. It will be understood
that the other intermediate or connecting parts will follow this retrograde motion.
The moment at which the blade carrier completes its upward stroke and that at
which the cam G is again brought to the position in which its concentric or pro-
jecting part can act upon the lever A coincide, so that the teeth of each saw
are again forced against the bottom of the cut, the whole operation as above
described being repeated.
This mechanism is applicable to every species of vertically reciprocating saws
it being immaterial whether the crank shaft is arranged at the upper or lower
part of the machine; it is sufficient in each case to modify the size and shape of
the lever according to the requirements of the work.
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. A reciprocating saw frame so arranged that the blades are held out of contact
with the bottom of the saw-cut during the inoperative stroke and brought to
bear with the required pressure upon the bottom of the said cut when the saw
is to perform its entting action the blade in motion, whether in or out of contact
with the material being parallel to the cut substantially as described and illustrated
in the accompanying drawings.
2. In a reciprocating saw frame the combination with the saw frame J of
arms
Hand E shafts B and F link D lever or arm A cam such as G and
springs N N connected with the frames substantially as and for the purpose
described and illustrated in the accompanying drawings.
3. In a reciprocating saw frame the combination with the saw frame J of a cam
such as G for giving an oscillating motion of the same duration in the upward as in
the downward strokes of the blades substantially as and for the purpose described
and illustrated in the accompanying drawings.
4. The combination and arrangement of parts constituting the complete saw
frame substantially as described and illustrated in the accompanying drawings.
Dated this 23rd day of March 1891.
W. P. THOMPSON & BOULT,
Agents for the Applicant.