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Патент USA US2113909

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‘April 12, 1938.
A. WASSERKAMPF
2,113,909
Y‘ DEVICE FOR STRETCHING SAW BLADES, PARTICULARLY IN SAWMILLS
Filed June‘ so, 1956
4 ml
Ziysi lg My
ahzf
Patented Apr. 12, 1938.
221132999?
UNlTTED ‘STATES PATENT OFFICE
DEVICE FOR STRETCHING SAW BLADES,
PARTICULARLY IN SAWIVIILLS‘
.
Alfons Wasserkampf, Hanover, Germany, assign- ,
or to Otto Lauenstein, Wernigerode/Harz, Gere
many
Application June so, 1936, Serial No. 88,191 '
In Germany October 20, 1934
r
.
6 Claim.
This invention relates to a device for stretching
saw blades, particularly in timber sawmills and
similar machines.
Various devices of this kind are known, all of
which however leave something to be desired.
5 With many devices it is impossible in practice to
stretch all the blades uniformly. Other devices
are imperfect because they do not allow for dif
ferences in length arising from uneven heating.
The present invention eliminates all these de
.10 fects. It permits of uniform stretching, and also
' automatic readjustment and compensation for
any differences in length.
The invention is explained below with refer
ence to theaccompanying drawing, in which:
1 C21
Fig. 1 is a side-view of ‘the tension device;
Fig. 2 is a section through the tension device
along the line A--B in Fig. 1;
Fig. 3 is a plan-view of the tension device.
The tension device is mounted on the top bars a
20 and b of the frame holding the blade s. In the
example the tension device consists of a frame
_with a steel body I and a bar 2 ?tted with feet 2a.
Thebody I has two rows of mutually staggered
cylindrical borings 3, all of which lead into a
V25 connecting channel 4. In each of the cylindrical
borings 3 is inserted a piston 5, the stroke of
which is, for example, restricted by stops.
The channel 4 is' in its turn connected, by
means of a connection pipe 8, to the cylinder 6
30 of a ?lling or forcingpress 1. By means of the
piston 9 ?tted in the cylinder 6 the press liquid
can be forced into the various borings 3, and
thus any desired pressure can be exerted on the
r pistons 5. The piston 9 can be moved forward by
hand, for example by means of a wrench placed
on the end of the piston-rod ID. The piston-rod
is provided with a thread, and guided in a clo
sure cap II with an internal screw thread, so that
40
- .55
v(Cl. 143—156)
First, after removing the closure screw I9, a
suitable press liquid is introduced, in such away
that no air pocket is left. Thereupon all, the pis
tons-5 are lifted with slight pressure as far as'
they will come out of their cylinders, by turning
the piston-rod It], so. that all the piston heads
lie in the same plane, which is advantageously
somewhat higher than the top edge of the bar 2.
The saw blades are then suspended in known
manner by means of wedge pins P, and the wedges
are driven in by hand until'the heads of the pis
tons 5, depressed thereby, lie at about the same
height as the top edge of the bar 2 and all the
saw blades are stretched to practically the same
initial tension. By advancing the
ther into its cylinder the spring 20
until the pressure fluid actuating
reaches the pressure corresponding
tension of the saw blades.
piston 9 fur
is compressed
the pistons 5
to the normal
This pressure can be
escape as the consequence of a lack of tightness,
the resulting drop in pressure is made up by the
compensating press, the piston l5, under the ac
tion of the powerful spring 20, being then pushed
further into its cylinder l6. Larger drops in
pressure can be made up for by readjustment of
the piston-rod ID, that is to say, by means of
30
the ?lling press 1.
I claim:
,
. 1. A device for uniformly stretching a plurality
of saw blades comprising a movable frame, a plu
rality of saw blades arranged in said frame, mem
bers applied to said frame and movable inde
with an end of one of said saw blades, and means
displaced.
fect on the several saw blades‘.
In order to allow for any differences in length
in the saw blades s, a compensating cylinder !6
is connected by means of connection pipe l2 to
the ?lling or forcing press 1. The piston l5
mounted in the cylinder I6 is pressed by a pow
erful compression spring 20, which constrains the
‘piston IE to enter the cylinder l6, thus compen
sating any variations in pressure. The piston-rod
M is led through the cylinder cover l3 and fur
ther to the outside. The projecting end is pro
vided with a scale l8, from which it is possible
to read the pressure of the liquid.
The tension device works in the following man
2. A device for uniformly stretching a plurality
of saw blades comprising holding means for the
respective ends of a plurality of saw blades, con
necting means connecting the holding means,
members each applied to one of the holding
'
35
pendently of each other and each engageable
to apply ?uid pressure to said members to actu
ate the latter and exert a uniform stretching ef
>
5
read from the scale Hi.
If the saw blades should extend differently
in length, for example in consequence of different
degrees of heating, or if any press liquid should
by turning the piston-rod II) the piston 9 can be
ner:
p-a O
5
means and engageable with an end of one saw
blade, and means to apply ?uid pressure to said
members to actuate the latter and exert a uni
form stretching effect on the several saw blades.
3. A device for uniformly stretching a plurality
of saw blades, comprising a movable frame, a
plurality of saw blades arranged in said frame,
members movable independently of each other
and each engageable with a saw blade, pressure 55
2,113,909
liquid supply means, and means for applying
pressure of the liquid to said members to actu
ate the latter and exert a uniform stretching ef
feet on the several saw blades, said members
and both means being applied to said frame.
4. A device for uniformly stretching a plural
ity of saw blades comprising a frame, a plurality
of saw blades arranged in said frame, members
communicating with said passage and adapted to
supply liquid under pressure to said bores to actu
movable independently of each other and each
10 engageable with one of said saw blades, means
tons movable in said bores and each engaging
ate said pistons.
'
r"
6. A device for uniformly stretching a plurality
of saw blades comprising a frame having cross
bars, a plurality of saw blades arranged in said
frame, a body applied to one of the cross bars of
said frame and including a plurality of bores, pis
and tensioning one saw blade, a passage common 10
for applying liquid pressure to said members to
actuate the latter and exert a uniform stretching
to the several bores, a pressure cylinder com
municating with said passage, a piston in the
effect on the several saw blades, and means for
pressure cylinder and having screw threaded en
compensating for variations in the pressure of
gagement therewith for varying the pressure of
the ?uid in said passage and bores, a compensat 15
15 the actuating liquid, said members and both
means being applied to said frame.
5. A device for uniformly stretching a plurality
of saw blades comprising a frame having cross
bars, a plurality of saw blades arranged’ in said
20 frame, a body applied to one of said crosslbars
ing cylinder communicating with the pressure
cylinder, a piston in the compensating cylinder,
a compensating spring coasting with the piston
in the compensating cylinder and normally tend
ing to compress the liquid in said cylinder, and a .
of said frame and including a plurality of bores,
pistons movable in said bores and each engaging
rod on the piston of the compensating cylinder
having a scale for indicating the pressure of the
and tensioning one saw blade, a passage com
pressure liquid.
mon to the several bores, and a pressure cylinder
ALFONS WASSERKAMPF.
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