Improvements in and connected with Saw Blade Tangs.
Year: 1896

page_text: Date of Application, 1st Jan., 1896
Complete Specification Left, 17th Sept., 1896-Accepted, 24th Oct.. 1895
PROVISIONAL SPECIFICATION.
Improvements in and connected with Saw Blade Tangs.
I, JOHANNES HEYN of 6 B Grabower Strasse of Stettin, in the Kingdom of
Prussia, German Empire, Engineer do hereby declare the nature of this invention
to be as follows:-
This invention refers in general to saws, especially gang saws or gang saw mills,
and in particular to the tangs of the blades of said saws; my improvements in
said tangs relate to means for drawing the same in their longitudinal direction so
as thereby to put the blades under tension; said means consist, briefly, in an
eccentric attached to the tang of the blade, and in a bipartite bearing supporting
said eccentric in at least two points or lines that are situated on opposite sides with
regard to the line of connection of the said eccentric and said tang.
The tang a (Fig. 1) is at its upper end furnished with the eccentric disk E, that
is supported by the upper part u of the bipartite bearing u u. Apart from the
eccentric position of the pivot said disk is circular, and the bearing surface of
said part u, or of the bearing block proper respectively, is shaped to correspond
to the curvature of the said disk. The lower part of said bearing, or the
bearing base plate respectively, is supported by the frame r. The disk E is
provided with a projection E' upon which may be put the key S (Fig. 3).
If the eccentric disk E is in the position shown in Figure 1, the pivot is nearest
to the bearing block u, and the blade s is, therefore, either but very slightly
strained, or is not strained at all. When said blade is to be strained, the key is
put upon the projection E¹ of the disk E, and the latter is then turned until the
desired degree of tension of the blades has been reached. By turning the said
disk, the pin is moved farther off the bearing-block u; and owing to the eccentric
position of said pin, the degree of tension of the blade will be the greatest when
the disk E has been turned for 180°.
In consequence of the bearing-block being not flat, but either curved (as u in
Figure 1) or angular (as u 2 in Figure 2), the disk E will automatically keep its
position whatever this latter may be; this will occur in any case in which there
are at least two points, or lines, of support (for the disk E) situated on opposite
sides with regard to the line of connection of said disk and the tang a, or to the
pin respectively, whereas with only one point, or line, of support the said disk
can be fixed in not more than two positions. be in Figure 2 indicate the two lines
of support existing with a bearing block (u 2) of angular configuration.
The base plate is exchangeable; it serves, first, for keeping friction entirely
off the lower surface of the hearing-block, and, second, for holding said block
constantly in proper contact with the disk E, irrespective of the distance between
said disk and the upper surface of the frame r. If either this frame, or the base-
plate u', or both these parts, become worn off by the constant friction between
themselves, said base-plate may easily be replaced by another i.e. thicker one.
Or if the base-plate chosen proves, perhaps, too thick, a thinner one may as easily
be substituted therefor. The distance between the disk E and the upper surface
of the frame depends, as a matter of course, on the length of the blades; and
as the several blades belonging to one gang are generally not all of exactly the
same lengths, the base-plates u may well be used for adjusting the parts E ų
according to said different lengths. When said parts have been adjusted by means
of a fitting base-plate u', and the disk E is turned in the direction of the arrow P

page_text: (Fig. 1), the blades will then be put under tension in a degree corresponding to
the degree of the angle of rotation of said disk.
The base-plate u may, if desired, be itself secured in position, for instance by
projections 3 (Figs. 4, 5, 7 & 8) taking over the block, or by recesses allowing
of the entrance of the framer (compare Fig. 6). To remove the plate u¹ from
the frame the tang a with its disk E and the block w must, as a matter of course,
be raised to a certain but low height.
I prefer to combine the block u with guide-pieces d (Figure 7) for the disk E;
said guide-pieces may, if desired, be used not on one side only of the tang or
tange a, but on both sides, as represented in Figure 8. This latter arrangement is
especially useful, if the block u is very small, and in such a case I extend the said
guide-pieces d down upon the base-plate u'.
Dated this 31st day of December 1895.
JOHANNES HEYN,
By Cassell & Co.,
Agents for the Applicant.
Improvements in and connected with Saw Blade Tangs.
I, JOHANNES HEYN, of 6 B Grabower Strasse, of Stettin, in the Kingdom of
Prussia, German Empire, 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 :-
This invention refers in general to saws, especially gang saws or gang saw mills,
and in particular to the tangs of the blades of said saws; my improvements in
said tangs relate to means for drawing the same in their longitudinal direction so
as thereby to put the blades under tension; said means consist, briefly, in an
eccentric attached to the tang of the blade, and in a bipartite bearing supporting
said eccentric in at least two points or lines that are situated on opposite sides with
regard to the line of connection of the said eccentric and said tang.
The tang a (see Figure 1 of the drawing sent in with Provisional Application)
is at its upper end furnished with the eccentric disk E, that is supported by the
upper part of the bipartite bearing u u. Apart from the eccentric position of
the pivot said disk is circular, and the bearing surface of said part u, or of the
bearing block proper respectively, is shaped to correspond to the curvature of the
said disk. The lower part u' of said bearing, or the bearing base-plate respectively,
is supported by the frame r. The disk E is provided with a projection E¹ upon
which may be put the key S (Figure 3).
If the eccentric disk E is in the position shown in Figure 1, the pivot is
nearest to the bearing-block u, aud the blade s is, therefore, strained either but
very slightly or not at all. When said blade is to be strained, the key is put upon
the projection E' of the disk E, and the latter is then turned until the desired
degree of tension of the blade s has been reached. By turning the said disk, the
pin is moved farther off the bearing-block n; and owing to the eccentric position
of said pin, the degree of tension of the blade will be the greatest when the disk E
has been turned for 180°.
In consequence of the bearing-block being not flat, but either curved (as u in
Figure 1) or angular (as u2 in Figure 2), the disk E will automatically keep its
position whatever this latter may be; this will occur in any case in which there
are at least two points, or lines, of support (for the disk E) situated on opposite
sides with regard to the line of connection of said disk and the tang a, or to the
pin respectively, whereas with only oue point or line of support the said disk can

page_text: be fixed in not more than two positions. c in Figure 2 indicate the two lines of
support existing with a bearing-block (u2) of angular configurations.
The base-plate u is exchangeable; it serves, first, for keeping friction entirely
off the lower surface of the bearing-block, and, second, for holding said block
constantly in proper contact with the disk E, irrespective of the distance between
said disk and the upper surface of the frame r. If either this frame, or the base-
plate u', or both these parts, become worn-off by the constant friction between
themselves, said base-plate may easily be replaced by another, i.e. thicker one.
Or if the base-plate chosen proves, perhaps too thick, a thinner one may as easily
be substituted therefor. The distance between the disk E and the upper surface
of the framer depends, as a matter of course, on the length of the blade s; and
as the several blades belonging to one gang are generally not all of exactly the
same lengths, the base-plates u may well be used for adjusting the parts Eu
according to said different lengths. When said parts have been adjusted by means
of a fitting base-plate ', and the disk E is turned in the direction of the arrow P
(Fig. 1), the blade s will then be put under tension in a degree corresponding to
the degree of the angle of rotation of said disk.
The base-plate may, if desired, be itself secured in position for instance by
projections u 3 (Figures 4, 5, 7 & 8) taking over the block u, or by recesses allowing
of the entrance of the framer (compare Fig. 6). To remove the plate u from
the frame the tang a with its disk E and the block u must, as a matter of course,
be raised to a certain but low height.
I prefer to combine the block u with guide-picces d (Figure 7) for the disk E;.
said guide-pieces may, if desired, be used not on one side only of the tang or
tangs o, but on both sides, as represented in Figure 8. This latter arrangement
is especially useful, if the block u is very small, and I let in such a case extend
the said guide-pieces d down upon the base-plate u¹.
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. In a saw, the combination with the tang of the blade, of an eccentric attached
to said tang and arranged so as to be adapted to put said blade under tension;
means for supporting said eccentric, and for securing it in position, for the purpose
as described.
2. In a saw, the combination with the tang of the blade, of a rotatable disk
attached eccentrically to said tang, and adapted to put said blade under tension;
means for supporting said disk, and for securing it in position, for the purpose as
described.
3. In a saw, the combination with the tang of the blade, of a rotatable disk,.
attached eccentrically to said tang, and adapted to put said blade under tension;
a bipartite bearing-block adapted to hold said disk, and shaped so as to support
the latter in two lines situated on opposite sides with regard to the line of connection
of the said disk and tang; said bearing-block being itself supported by suitable
parts of the frame, and being adapted to be displaced upon said parts in the plane
of the said disk, and rectangularly to the direction of motion of the said tang, for
the purpose as described.
4. In a saw, the combination with the tang of the blade, of a rotatable disk
attached eccentrically to said tang, and having a segment cut off; a bipartite
bearing-block adapted to hold said disk, and shaped so as to support the latter at
least in two lines situated on opposite sides with regard to the line of connection
of the said disk and tang; said bearing-block being itself supported by suitable
parts of the frame, and being adapted to be displaced upon said parts in the plane
of the said disk, and rectangularly to the direction of motion of the said tang, for
the purpose as described.
5. In a saw, the combination with the tang of the blade, of a rotatable disk
attached eccentrically to said tang, and adapted to put said blade under tension;

page_text: a bipartite bearing-block adapted to support said disk in at least two lines situated
on opposite sides with regard to the line of connection of the said tang and disk;
guide-pieces for the latter fixed to said bearing-block; the latter being itself
supported by a suitable part of the frame, and being adapted to be displaced upon
said part in the plane of the said disk, and rectangularly to the direction of motion
of the said tang, for the purpose as described.
Dated this 16th day of September 1896.
JOHANNES HEYN,
By Cassell & Co.,
22 Glasshouse Street, Regent Street, London, W.,
Agents for the Applicant.
JOHANNES HEYN,
By Cassell & Co.,
22 Glasshouse Street, Regent Street, London, W.,
Agents for the Applicant.