U.S. patent application number 15/317312 was filed with the patent office on 2017-12-21 for an improved wall or floor saw.
The applicant listed for this patent is HUSQVARNA AB. Invention is credited to Andreas Jonsson.
Application Number | 20170361387 15/317312 |
Document ID | / |
Family ID | 54833929 |
Filed Date | 2017-12-21 |
United States Patent
Application |
20170361387 |
Kind Code |
A9 |
Jonsson; Andreas |
December 21, 2017 |
AN IMPROVED WALL OR FLOOR SAW
Abstract
The present invention relates to a wall or floor chain sawing
device (1), comprising a chain bar assembly (37) which in turn
comprises a chain bar (2) having a longitudinal extension (17) and
guiding a chain (3) at least partly around its perimeter. The chain
bar assembly (37) further comprises a chain bar housing (6) that is
attached to, and partially covers, the chain bar (2) and the chain
(3). The chain sawing device (1) comprises a motor (9), a track
interface (7) that is arranged to co-operate with a guiding track
(8), and a power transmission arrangement (10) that is adapted to
transfer a motion from said motor (9) to the chain (3). The sawing
device (1) comprises a first pivotable support rod (12) and a
second pivotable support rod (13), where each pivotable support rod
(12, 13) has a corresponding first end (12a, 13a) and a second end
(12b, 13b). Each first end (12a, 13a) is at least indirectly
pivotably attached to the motor (9), and each second end (12b, 13b)
is at least indirectly pivotably attached to the chain bar assembly
(37).
Inventors: |
Jonsson; Andreas;
(Hallsberg, SE) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
HUSQVARNA AB |
HUSKVARNA |
|
SE |
|
|
Prior
Publication: |
|
Document Identifier |
Publication Date |
|
US 20170120354 A1 |
May 4, 2017 |
|
|
Family ID: |
54833929 |
Appl. No.: |
15/317312 |
Filed: |
June 12, 2014 |
PCT Filed: |
June 12, 2014 |
PCT NO: |
PCT/SE2014/050709 PCKC 00 |
371 Date: |
December 8, 2016 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
B27B 17/0083 20130101;
B27B 17/08 20130101; B23D 57/02 20130101; B28D 1/084 20130101; B28D
1/088 20130101 |
International
Class: |
B23D 57/02 20060101
B23D057/02; B27B 17/00 20060101 B27B017/00; B27B 17/08 20060101
B27B017/08; B28D 1/08 20060101 B28D001/08 |
Claims
1. A wall or floor chain sawing device, comprising a chain bar
assembly which in turn comprises a chain bar that is guiding a
chain at least partly around a perimeter of the chain bar, the
chain bar having a longitudinal extension, wherein the chain bar
assembly further comprises a chain bar housing that is attached to,
and partially covers, the chain bar and the chain, wherein the
chain sawing device comprises a motor, a track interface that is
arranged to co-operate with a guiding track, and a power
transmission arrangement that is adapted to transfer a motion from
said motor to the chain, wherein the chain sawing device comprises
a first pivotable support rod and a second pivotable support rod,
wherein each pivotable support rod has a corresponding first end
and second end, wherein each first end is at least indirectly
pivotably attached to the motor, and wherein each second end is at
least indirectly pivotably attached to the chain bar assembly.
2. The chain sawing device according to claim 1, wherein each
second end is pivotably attached to a second mounting bracket that
is comprised in the chain bar assembly.
3. The chain sawing device according to claim 2, wherein the chain
bar assembly comprises a supporting plate to which the chain bar
and the chain bar housing are attached, wherein the second mounting
bracket is releasably mounted to the supporting plate by a
releasable attachment means that runs in an adjustment slot in the
second mounting bracket, wherein, when released, at least a part of
the attachment means is adapted to travel within the adjustment
slot, allowing the longitudinal extension of the chain bar to be
adjusted to a desired angle.
4. The chain sawing device according to claim 1, wherein each first
end is pivotably attached to a first mounting bracket.
5. The chain sawing device according to claim 4, wherein the first
mounting bracket is mounted to a holding frame that is mounted to
the motor.
6. The chain sawing device according to claim 5, wherein the chain
bar assembly comprises a locking arrangement that is arranged for
mounting the first mounting bracket to the holding frame.
7. The chain sawing device according to claim 6, wherein a support
rod plane runs through the pivotable support rods, and in that a
locking plane runs through the locking arrangement, wherein, in a
second locking position, the locking arrangement is positioned
between the pivotable support rods such that the support rod plane
and the locking plane coincide or are very close.
8. The chain sawing device according to claim 7, wherein the
locking arrangement comprises at least a first spring-loaded
locking ball and a second spring-loaded locking ball, where, in the
first locking position, the first spring-loaded locking ball is
arranged to engage a corresponding first indent in the first
pivotable support rod, and the second spring-loaded locking ball is
arranged to engage a corresponding second indent in the second
pivotable support rod.
9. The chain sawing device according to claim 6, wherein the
locking arrangement comprises a screw knob, wherein a part of the
holding frame is arranged to run in a corresponding recess in the
locking arrangement, wherein said part of the holding frame is
attachable to the locking arrangement by rotating the screw knob
such that a retaining force is provided in the recess in a second
locking position.
10. The chain sawing device according to claim 1, wherein the power
transmission arrangement has a first end that is pivotably attached
to the motor and a second end that is pivotably attached to the
chain bar, such that the chain bar is enabled to perform a circular
movement in a cutting plane while maintaining a direction of
longitudinal extension of the chain bar within the cutting
plane.
11. The chain sawing device according to claim 1, wherein the chain
bar assembly is releasably attachable to the holding frame and the
power transmission arrangement.
12. The chain sawing device according to claim 1, wherein the power
transmission arrangement's first end comprises a motor output shaft
of the motor, and the second end comprises a gear output shaft that
is connected to a power transfer wheel that is comprised in a chain
bar transmission arrangement that is arranged to propel the
chain.
13. The chain sawing device according to claim 1, wherein the
pivotable support rods are formed as handles with a corresponding
handle aperture in each pivotable support rod, allowing the chain
bar assembly to be carried in any one of the pivotable support
rods.
Description
TECHNICAL FIELD
[0001] The present invention relates to a wall or floor chain
sawing device that comprises a chain bar assembly which in turn
comprises a chain bar having a longitudinal extension and guiding a
chain at least partly around its perimeter. The chain bar assembly
further comprises a chain bar housing that is attached to, and
partially covers, the chain bar and the chain. The chain sawing
device comprises a motor, a track interface that is arranged to
co-operate with a guiding track, and a power transmission
arrangement that is adapted to transfer a motion from said motor to
the chain.
BACKGROUND
[0002] A wall saw or floor saw is used for cutting openings in
either a wall or a floor. While some saws are designed specifically
to cut only a wall or a floor, wall saws have a bolt on a guiding
track and are designed to cut the structure along the track, i.e. a
wall or a floor. In the following, only wall saws will be
discussed, although wall saws for cutting floors should also be
considered as included in the discussion. A wall saw typically uses
a circular cutting blade. Sometimes a concrete chain-saw with a bar
and chain is used to cut the opening.
[0003] When sawing an opening in a floor or a wall with a wall saw,
there is a problem in the corners of the intended opening. Due to
the rounded shape of the circular saw blade, all material is not
penetrated at the corners and has to be removed afterwards with a
concrete chain saw. Alternatively, the saw blade may be moved past
the corner, partly outside the border of the opening to remove all
material at each corner. This creates a so called overcut which to
a degree weakens the structure around the opening.
[0004] Examples of previous sawing arrangements are described in
US2012/0180773 and US2013/0306047, which are incorporated as
reference. In these documents, a chain saw bar is pivotable and
arranged to slide in guiding tracks, which is a complicated design
that requires a complex control of the feeding motors and it is
sensitive to dirt such as concrete dust.
[0005] There is thus a need for a wall saw chain sawing device that
is less complicated and less sensitive than such saws according to
prior art.
SUMMARY
[0006] It is an object of the present invention to provide a wall
saw or floor saw that is better adapted to handle sawing in corners
than those disclosed in the prior art.
[0007] This object is obtained by means of a wall or floor chain
sawing device that comprises a chain bar assembly which in turn
comprises a chain bar having a longitudinal extension and guiding a
chain at least partly around its perimeter. The chain bar assembly
further comprises a chain bar housing that is attached to, and
partially covers, the chain bar and the chain. The chain sawing
device comprises a motor, a track interface that is arranged to
co-operate with a guiding track, and a power transmission
arrangement that is adapted to transfer a motion from said motor to
the chain.
[0008] That the sawing device furthermore comprises a first
pivotable support rod and a second pivotable support rod, where
each pivotable support rod has a corresponding first end and second
end. Each first end is at least indirectly pivotably attached to
the motor, and each second end is at least indirectly pivotably
attached to the chain bar assembly.
[0009] According to an example, each second end is pivotably
attached to a second mounting bracket that is comprised in the
chain bar assembly.
[0010] According to another example, the chain bar assembly
comprises a supporting plate to which the chain bar and the chain
bar housing are attached, where the second mounting bracket is
releasably mounted to the supporting plate by means of a releasable
attachment means that runs in an adjustment slot in the second
mounting bracket. When released, at least a part of the attachment
means is adapted to travel within the adjustment slot, allowing the
longitudinal extension of the chain bar to be adjusted to a desired
angle.
[0011] According to another example, each first end is pivotably
attached to a first mounting bracket. The first mounting bracket
may be mounted to a holding frame (that is mounted to the motor.
Furthermore, the chain bar assembly may comprise a locking
arrangement that is arranged for mounting the first mounting
bracket to the holding frame.
[0012] According to another example, a support rod plane runs
through the pivotable support rods, and a locking plane runs
through the locking arrangement. In a second locking position, the
locking arrangement is positioned between the pivotable support
rods such that the support rod plane and the locking plane
coincide.
[0013] According to another example, the power transmission
arrangement has a first end that is pivotably attached to the
motor, and a second end that is pivotably attached to the chain
bar. The chain bar is then enabled to perform a circular movement
in a cutting plane while maintaining the direction of its
longitudinal extension within the cutting plane.
[0014] According to another example, the pivotable support rods are
formed as handles with a corresponding handle aperture in each
pivotable support rod, allowing the chain bar assembly to be
carried in any one of the pivotable support rods.
[0015] Other examples are disclosed in the dependent claims.
[0016] Many advantages are provided by means of the present
invention, for example the sawing device: [0017] is enabled to
perform a clear cut in corners, avoiding the disadvantages of prior
art; and [0018] becomes less sensitive to dirt, such as concrete
dust. [0019] Is less complicated.
BRIEF DESCRIPTION OF THE DRAWINGS
[0020] In the following, the present invention will be described
more in detail, with reference to the appended drawings, where:
[0021] FIG. 1 shows a perspective side view of a wall chain sawing
device in a first position;
[0022] FIG. 2 shows a top view of the wall chain sawing device in a
first position;
[0023] FIG. 3 shows a perspective side view of a wall chain sawing
device in a second position;
[0024] FIG. 4 shows a top view of the wall chain sawing device in a
second position;
[0025] FIG. 5 shows a perspective side view of the wall chain
sawing device in the second position, without chain bar and chain
bar housing;
[0026] FIG. 6 shows a perspective side view of a power transmission
arrangement;
[0027] FIG. 7 shows a side view of a gear-train arrangement in the
power transmission arrangement;
[0028] FIG. 8 shows a perspective side view of the wall chain
sawing device with the chain bar assembly removed;
[0029] FIG. 9 shows a perspective side view of a chain bar
assembly;
[0030] FIG. 10 shows a top view of an alternative chain bar
assembly in a first locking position;
[0031] FIG. 11 shows a perspective view of the alternative chain
bar assembly in an intermediate position;
[0032] FIG. 12 shows a side view of the alternative chain bar
assembly in a second locking position; and
[0033] FIG. 13 shows a side view of the alternative chain bar
assembly in the first locking position.
DETAILED DESCRIPTION
[0034] In the following, a wall chain sawing device 1 will be
described with reference to FIG. 1, FIG. 2, FIG. 3, FIG. 4 and FIG.
6. FIG. 1 shows a perspective side view and FIG. 2 shows a top view
of the wall chain sawing device 1 in a first position. FIG. 3 shows
a perspective side view and FIG. 4 shows a top view of the wall
chain sawing device 1 in a second position. FIG. 5 shows a
perspective side view of the wall chain sawing device 1 in the
second position, without chain bar 2 and without chain bar housing
6. FIG. 6 shows a perspective side view of a power transmission
arrangement 10.
[0035] The wall chain sawing device 1 comprises a chain bar
assembly 37 that in turn comprises chain bar 2 that is guiding a
chain 3 around its perimeter, where the chain bar 2 has a
longitudinal extension 17. The chain bar assembly 37 further
comprises a chain bar transmission arrangement 38 that is arranged
to propel the chain 3 when running. The chain bar transmission
arrangement 38 will be described more later. The chain bar assembly
37 also comprises a chain bar housing 6 that is attached to, and
partially covers, the chain bar 2, as well as a water inlet 39
arranged to be connected to a water supply in a previously known
manner.
[0036] The wall chain sawing device 1 further comprises a track
interface 7 that is arranged to co-operate with a guiding track 8,
a first motor 9 and a power transmission arrangement 10. The
guiding track 8 is releasably attachable to a wall or a floor 11,
and has a longitudinal extension E in a direction along which the
sawing is made. When sawing, the wall chain sawing device 1 is
moved along the guiding track 8 via the track interface 7. The
guiding track 8 may be comprised in the chain sawing device 1, so
the track interface fixes the device 1 to the track 8. The guiding
track may also be a separate part to which the chain sawing device
1 is releasably connected by the track interface.
[0037] The wall chain sawing device 1 may be run on the track by
means of a separate track motor (not shown) comprised in the track
interface 7.
[0038] The power transmission arrangement 10 is adapted to transfer
motion from said motor 9 to the chain 3 of the chain bar 2 via the
chain bar transmission arrangement 38. The power transmission
arrangement 10 has a first end 10a that is attached to the motor 9
and a second end 10b that is attached to the chain bar housing 6.
Power from the motor 9 is transferred via a gear-train comprised in
the power transmission arrangement 10, from the first end part 10a
to the second end part 10b, where, at the second end part 10b,
power is transferred to the power transfer wheel 5. An example of a
gear-train will be described more in detail later.
[0039] According to the present invention, the sawing device 1
comprises a first pivotable support rod 12 and a second pivotable
support rod 13, where each pivotable support rod 12, 13 has a
corresponding first end 12a, 13a and second end 12b, 13b. Each
first end 12a, 13a is pivotably attached to a first mounting
bracket 32 which in turn is mounted to a holding frame 14 that is
mounted to the motor 9, and each second end 12b, 13b is pivotably
attached to a second mounting bracket 35 that is comprised in the
chain bar assembly 37 as will be described more in detail later. In
this example, the pivotable support rods 12, 13 are comprised in
the chain bar assembly 37.
[0040] The first end 10a of the power transmission arrangement 10
is pivotably attached to the motor 9, and the second end 10b of the
power transmission arrangement 10 is pivotably attached to the
chain bar housing 6.
[0041] By means of this arrangement, the chain bar 2 is enabled to
perform a circular movement 15 in a cutting plane 16 while
maintaining the direction of its longitudinal extension 17 within
said cutting plane 16. The cutting plane 16 in question is the
plane where the sawing is performed, and which runs parallel to,
and a certain distance from, the guiding track's longitudinal
extension E. This is shown in FIG. 1 and FIG. 2, where the wall
chain sawing device 1 is in a first position, and in FIG. 3 and
FIG. 4, where the wall chain sawing device 1 is in a second
position, the chain bar 2 having been moved along the possible
circular movement 15 in said cutting plane 16.
[0042] By means of arcuate movements along the possible circular
movement 15, it becomes possible to position the chain bar 2 at a
desired depth, while maintaining the distance from the longitudinal
extension E of the guiding track 8 and said cutting plane 16. The
sawing device 1 may thus be moved along the guiding track 8, while
the chain bar 2 may be positioned at a desired depth. In this way,
there is no problem to let the chain bar 2 extend to such a depth
that corners are cut in a desired manner, without leaving any
un-penetrated material at the corners that otherwise would have to
be either removed afterwards manually or by sawing past the corner,
outside the border of the opening.
[0043] With reference to also to FIG. 6, the power transmission
arrangement 10 includes a transmission housing 21. The first end
10a comprises a motor output shaft 19 of the motor 9, and the
second end 10b comprises a gear output shaft 25 that is connected
to a power transfer wheel 5 comprised in the chain bar transmission
arrangement 38 as indicated in FIG. 5. On raising and lowering the
chain bar 2, the transmission housing 21 will be turned on a
pivotal axis that is coaxial with a rotation axis of the motor
output shaft 9, and the second end, will move in an arc according
to said circular movement 15.
[0044] An example of a transmission gear-train inside the
transmission housing 21 is shown in FIG. 7. A first gear 22 is
mounted on the motor output shaft 19, which is shown as having a
male spline for transferring large forces to a first gear 22 that
has a matching female spline. Two first gear assemblies 23 are
mounted to be driven in parallel by the first gear 22, and a common
second gear 24 is mounted to be driven indirectly by the two first
gear assemblies 23 in parallel. The second gear 24 has a gear
output shaft 25 on which the chain bar 2 is intended to be
mounted.
[0045] Although a drive chain might be used for transferring the
rotary force to the second gear 24, in this example, a third gear
26 is mounted interposed between the gear assemblies 23 and the
second gear 24 to be driven by the gear assemblies 23 and drive the
second gear 24. Each first gear assembly 23 comprises a fourth gear
27 integral with a coaxial shaft 28 and constituting a driving
gear, and a fifth gear 29 mounted to be able to rotate on the
coaxial shaft 28 and constituting a driven gear.
[0046] The drive chain may also comprise friction clutches,
although not shown in the drawings.
[0047] Many other drive chain configurations are of course
possible, for example the first gear assemblies 23 may be omitted,
the first gear 22 and the third gear 26 then driving the second
gear 24 directly.
[0048] In the following, an example of the chain bar transmission
arrangement 38 will be described. As shown in FIG. 5, the power
transfer wheel 5 is connected to an intermediate wheel 30 which in
turn is connected to a driving wheel 31. Although not shown in FIG.
5 for the sake of clarity, on the part of the driving wheel 31 that
is closest to the chain is connected to a chain driving wheel with
teeth that engage the chain 3, the chain bar transmission
arrangement 38 comprising the power transfer wheel 5, the
intermediate wheel 30, the driving wheel 31 and the chain driving
wheel.
[0049] This means that when the power transfer wheel 5 is brought
into motion, the chain driving wheel transfers a direct driving
motion to the chain 3 that is brought to the chain driving wheel
via the intermediate wheel 30 and the driving wheel 31. This is a
common type of transmission configuration in a chain saw bar 2 of
this kind, and only described for improving the general
understanding.
[0050] According to an example, as shown in FIG. 5, the first
mounting bracket 32, to which the pivotable support rods 12, 13 are
connected, is releasable from the holding frame 14 by means of a
locking arrangement 33. When the locking arrangement 33 is
unlocked, the chain bar assembly 37 with the pivotable support rods
12, 13 and the first mounting bracket 32 may be removed from the
rest of the wall sawing device 1. The power transfer wheel 5 is
then disengaged from the gear output shaft 25.
[0051] The locking arrangement may be of any suitable kind, for
example in the form of a screw lock, bayonet lock or snap lock.
[0052] The wall sawing device 1 without the chain bar assembly 37
is shown in FIG. 8, and the removed chain bar assembly 37 is shown
in FIG. 9.
[0053] The purpose of removing the chain bar assembly 37 may be for
changing the chain 3 or other service of the chain bar assembly 37.
Another purpose may be for changing the chain bar assembly 37 to
another sawing tool, such as for example a circular saw assembly
with a circular saw blade that may be more suited for cutting
longer lengths. This means that a circular saw assembly may be used
for regular cutting, and that a chain bar assembly 37 may be used
at corners and the like. However, a chain bar assembly 37 may also
be used for all cutting.
[0054] As shown in FIG. 5, the chain bar assembly 37 comprises a
supporting plate 34 to which the transmission arrangement 38, the
chain bar 2 and the chain bar housing 6 are attached. The
supporting plate 34 and the chain bar housing 6 together cover a
part of the chain 3. The second mounting bracket 35 is mounted to
the supporting plate 34 by means of a top bolt 36 that runs in an
arcuate slot 41 in the second mounting bracket 35. The top bolt 36
is releasably attached to the second mounting bracket 35 by means
of for example a nut 40, as shown in FIG. 9, on the other side of
the second mounting bracket 35. When the top bolt 36 is released,
it may travel within the arcuate slot 41, allowing the longitudinal
extension 17 of the chain bar 2 to be adjusted to a desired angle.
The arcuate slot 41 does not have to be arcuate, but may have any
suitable extension and shape, and is generally constituted by an
adjustment slot 41. The top bolt 36 and the nut 40 are generally
constituted by any type of suitable attachment means, for example a
spring-loaded tension lock.
[0055] The present invention is not limited to the above, but may
vary freely within the scope of the appended claims. For example,
the wall sawing device described above may also be a floor sawing
device, as well as a combination thereof.
[0056] All details about gear-trains and different kinds of
transmission devices are only disclosed as examples; many other
types of these are of course conceivable. The motor 9 may for
example be an electrical motor, a hydraulic motor, an air power
motor or a combustion motor.
[0057] The pivotable support rods 12, 13 have been shown to be
comprised in the chain bar assembly 37. This is, however, not
necessary, for example in a case where the chain bar assembly 37 is
attached to the rest of the chain sawing device 1 in a more fixed
manner, not being intended to be easily released, and not being
intended to be interchangeable.
[0058] The pivotable support rods 12, 13 may be pivotably connected
directly to the motor, the first mounting bracket 32 and the
holding frame 14 not being necessary. In any case, each first end
12a, 13a is at least indirectly pivotably attached to the motor 9.
Also, the second mounting bracket 35 is not necessary either, each
second end 12b, 13b at least indirectly being pivotably attached to
the chain bar assembly 37.
[0059] With reference to FIG. 10, showing a top view of an
alternative chain bar assembly 37' in a first locking position,
arranged for carrying the chain bar assembly, the pivotable support
rods 12', 13' have a respective first end 12a', 13a' and second end
12b', 13b'. The pivotable support rods 12', 13' are formed as
handles with a corresponding handle aperture 42, 43 in each
pivotable support rod 12', 13', allowing the chain bar assembly 37'
to be easily carried in any one of the pivotable support rods 12',
13' in the first locking position.
[0060] Furthermore, here an alternative locking arrangement 33' is
pivotable by means of a hinge 44, providing a more compact unit
that is easy to handle with decreased risk for injuries due to less
protruding parts when the locking arrangement 33' is folded towards
the supporting plate 34.
[0061] The locking arrangement will now be discussed more in detail
with reference also to FIG. 11, showing a perspective view of the
locking arrangement 33' in an intermediate position; FIG. 12,
showing a side view of the locking arrangement 33' in a second
locking position where it may be locked to the part with the motor
9; and to FIG. 13, showing a side view of the locking arrangement
33' in the first, carrying, position, corresponding to FIG. 10.
[0062] The locking arrangement 33' comprises a screw knob 45, a
first spring-loaded locking ball 46 and a second spring-loaded
locking ball 47. A part of the holding frame 14, as shown in for
example FIG. 5, is arranged to run in a corresponding U-shaped
recess 48 in the locking arrangement 33'. Said part of the holding
frame 14 may then be attached to the locking arrangement 33' by
rotating the screw knob 45 such that a retaining force is provided,
the screw knob 45 having a threaded part 45a (shown in FIG. 13)
which then engages a correspondingly threaded aperture 52 in the
first mounting bracket 32, shown in FIG. 11. This corresponds to
the second locking position, as shown in FIG. 12.
[0063] With reference to FIG. 12, a support rod plane 49 runs
through the pivotable support rods 12', 13', and a locking plane 50
runs through the locking arrangement 33'. In the second locking
position as shown in FIG. 12, the support rod plane 49 and the
locking plane 50 are running parallel to each other. Generally, in
the second locking position, support rod plane 49 and the locking
plane 50 are separate from each other.
[0064] In the first locking position, as shown in FIG. 10 and FIG.
13, the locking arrangement 33' is folded such that the locking
arrangement 33' is positioned between the pivotable support rods
12', 13', the screw knob 45 faces the chain bar assembly 37' and
such that the spring-loaded locking balls 46, 47 are engaging
corresponding indents 51 (only one shown in FIG. 11) in the
pivotable support rods 12', 13'. Then the first spring-loaded
locking ball 46 engages a corresponding first indent in the first
pivotable support rod 12', and the second spring-loaded locking
ball 47 engages a corresponding second indent 51 in the second
pivotable support rod 13'. In the first locking position, the
support rod plane 49 and the locking plane 50 coincide. In this
manner, the pivotable support rods 12', 13' are held in a firm
position, allowing the chain bar assembly 37' to be safely and
easily carried.
[0065] Above, the alternative locking arrangement 33' disclosed
above is described together with the pivotable support rods 12',
13' formed as handles with corresponding handle apertures 42, 43.
However, the alternative locking arrangement 33' may be used for
any type of pivotable support rods, and the pivotable support rods
12', 13' which are formed as handles with corresponding handle
apertures 42, 43 may be used for any type of locking arrangement,
the described combination is only an example.
[0066] There may be more than the two spring-loaded locking balls
46, 47 described in order to get more positions or a more secure
lock in the first locking position.
[0067] The spring-loaded locking balls 46, 47 may be comprised in
any type of locking arrangement, and is not limited to the one with
a screw knob.
[0068] The recess 48 may have other shapes than a U-shape.
[0069] In general, the present invention relates to a wall or floor
chain sawing device 1 that comprises a chain bar assembly 37 which
in turn comprises a chain bar 2 that is guiding a chain 3 at least
partly around its perimeter, the chain bar 2 having a longitudinal
extension 17. The chain bar assembly 37 further comprises a chain
bar housing 6 that is attached to, and partially covers, the chain
bar 2 and the chain 3. The chain sawing device 1 comprises a motor
9, a track interface 7 that is arranged to co-operate with a
guiding track 8, and a power transmission arrangement 10 that is
adapted to transfer a motion from said motor 9 to the chain 3.
[0070] The sawing device 1 comprises a first pivotable support rod
12 and a second pivotable support rod 13, where each pivotable
support rod 12, 13 has a corresponding first end 12a, 13a and
second end 12b, 13b. Each first end 12a, 13a is at least indirectly
pivotably attached to the motor 9, and each second end 12b, 13b is
at least indirectly pivotably attached to the chain bar assembly
37.
[0071] The pivotable support rods 12, 13 may have any suitable
shapes, such as cylindrical, flat, straight or curved. The
pivotable support rods 12, 13 may comprise apertures that function
as handles, as described previously.
[0072] The pivotable support rods 12, 13 may be directly attached
to the motor 9 and the chain bar assembly, or indirectly, for
example via a mounting means or similar, such as the mounting
brackets described previously.
[0073] Preferably, the power transmission arrangement 10 has a
first end 10a that is pivotably attached to the motor 9 and a
second end 10b that is pivotably attached to the chain bar 2. The
chain bar 2 is then enabled to perform a circular movement 15 in a
cutting plane 16 while maintaining the direction of its
longitudinal extension 17 within the cutting plane 16). However,
other arrangements for connecting the power transmission
arrangement 10 occur.
* * * * *