U.S. patent application number 12/919053 was filed with the patent office on 2011-01-06 for scraper blade and scraper for scraping off materials from a substrate.
This patent application is currently assigned to PROVERUM AG. Invention is credited to Moritz Muhlebach.
Application Number | 20110000045 12/919053 |
Document ID | / |
Family ID | 39942758 |
Filed Date | 2011-01-06 |
United States Patent
Application |
20110000045 |
Kind Code |
A1 |
Muhlebach; Moritz |
January 6, 2011 |
SCRAPER BLADE AND SCRAPER FOR SCRAPING OFF MATERIALS FROM A
SUBSTRATE
Abstract
A scraper blade (10) made of a flat metallic material for a
scraper (11) for scraping materials off a substrate has a scraping
section (13) which has at least one scraping surface (12) on the
front end for scraping off materials and with a fastening section
(14) for fastening to a fastening part (15) of the scraper (11) on
the back end. Furthermore, the scraper blade has at least one guide
section (18, 20) for diverting the scraped-off material over at
least one front end face (19, 21) of the fastening part (15), and
the guide section (18, 20) can be obtained by forming of the flat
metallic material.
Inventors: |
Muhlebach; Moritz;
(Dietlikon, CH) |
Correspondence
Address: |
ROBERTS MLOTKOWSKI SAFRAN & COLE, P.C.;Intellectual Property Department
P.O. Box 10064
MCLEAN
VA
22102-8064
US
|
Assignee: |
PROVERUM AG
Barr
CH
|
Family ID: |
39942758 |
Appl. No.: |
12/919053 |
Filed: |
February 29, 2008 |
PCT Filed: |
February 29, 2008 |
PCT NO: |
PCT/EP08/01597 |
371 Date: |
August 24, 2010 |
Current U.S.
Class: |
15/236.01 |
Current CPC
Class: |
E04D 15/003 20130101;
E04G 23/006 20130101 |
Class at
Publication: |
15/236.01 |
International
Class: |
A47L 17/06 20060101
A47L017/06 |
Claims
1-16. (canceled)
17. Scraper blade of a flat metallic material for a scraper for
scraping materials off a substrate, comprising: a scraping section
which has at least one scraping surface on a front end portion of
the blade for scraping off materials and a fastening section for
fastening to a fastening part of the scraper on a back end portion,
wherein at least one guide section for diverting scraped-off
material over at least a front end of the fastening section is
provided, and wherein the at least one guide section is a portion
of the flat metallic material of the blade located between the
front end of the fastening section and the scraping section which
has been deformed out of the plane of the front end portion of the
blade in at least one direction.
18. Scraper blade as claimed in claim 17, wherein the flat metallic
material has the same thickness in the regions of the scraping
section, the fastening section and the guide section.
19. Scraper blade as claimed in claim 17, wherein the guide section
passes without interruption into the fastening section.
20. Scraper blade as claimed in claim 17, wherein the fastening
section has a planar clamping region and at least one holding
region which is angled relative to the clamping region and which
passes into the guide section.
21. Scraper blade as claimed in claim 20, wherein the holding
region is angled at least one of up and down by roughly 30.degree.
to 90.degree. relative to the clamping region.
22. Scraper blade as claimed in claim 20, wherein the scraping
section is a planar, flat region and wherein the scraping section
and the clamping region of the fastening section are located in a
common plane.
23. Scraper blade as claimed in claim 20, wherein the guide section
has at least one of an ascending and a descending slope of less
than 30.degree..
24. Scraper blade as claimed in claim 23, wherein the holding
region of the fastening section and the guide section have the same
slope.
25. Scraper blade as claimed in claim 17, wherein a distance
between at least one of a highest point and a low point of the
guide surface and at least one of a central longitudinal axis of
the scraping section and a central longitudinal axis of the
clamping region of the fastening section is less than 10 mm.
26. Scraper blade as claimed in claim 17, wherein the scraping
surface and the guide surface are aligned.
27. Scraper blade as claimed in claim 17, wherein the guide section
has a transition region to the fastening section, the transition
region having a rounded diverting edge.
28. Scraper blade as claimed in claim 17, wherein the at least one
guide section comprises a plurality of guide sections, the guide
sections being located in regions spaced transversely across the
scraper blade relative to a scraping direction.
29. Scraper blade as claimed in claim 28, wherein the plurality of
guide sections comprise series of guides sections that extend
alternately in opposite directions out of the plane of the front
end portion of the blade
30. Scraper blade as claimed in claim 29, wherein the guide
sections are formed by bent-up, punched out regions of the
blade.
31. Scraper blade as claimed in claim 28, wherein the guide
sections are formed by bent-up, punched out regions of the
blade.
32. Scraper blade as claimed in claim 17, wherein the front end of
the scraping section is beveled on at least one of the bottom and
the top of the blade.
33. Hand scraper or stripper for scraping materials off a
substrate, comprising a fastening part for fastening a scraper
blade and a scraper blade having: a scraping section which has at
least one scraping surface on a front end portion of the blade for
scraping off materials and a fastening section for fastening to a
fastening part of the scraper on a back end portion, wherein at
least one guide section for diverting scraped-off material over at
least a front end of the fastening section is provided, and wherein
the at least one guide section is a portion of the flat metallic
material of the blade located between the front end of the
fastening section and the scraping section which has been deformed
out of the plane of the front end portion of the blade in at least
one direction.
34. Hand scraper or stripper as claimed in claim 33, wherein the
fastening part has an upper fastening piece and a lower fastening
piece, and a recess for holding a fastening section of the scraper
blade between the upper fastening piece and the lower fastening
piece, the recess having an exit opening for the scraper blade,
wherein the exit opening is provided on one of the upper side and
lower side of the fastening part.
35. Hand scraper or stripper as claimed in claim 34, wherein the
recess has a first, planar recess region for the clamping region of
the fastening section and a second recess region connected to the
first recess region for an angled holding region of the fastening
section, the second recess region being angled relative to the
first recess region and the second recess region ending in the exit
opening.
36. Hand scraper or stripper according to claim 33, wherein the at
least one guide section comprises a plurality of guide sections,
the guide sections being located in regions spaced transversely
across the scraper blade relative to a scraping direction.
37. Hand scraper or stripper as claimed in claim 36, wherein the
plurality of guide sections comprise series of guides sections that
extend alternately in opposite directions out of the plane of the
front end portion of the blade
38. Hand scraper or stripper as claimed in claim 37, wherein the
guide sections are formed by bent-up, punched out regions of the
blade.
39. Hand scraper or stripper as claimed in claim 36, wherein the
guide sections are formed by bent-up, punched out regions of the
blade.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of Invention
[0002] The invention relates to a scraper blade made of a flat
metallic material for a scraper for scraping materials off a
substrate, with a scraping section which has at least one scraping
surface for scraping off materials on the front end and with a
fastening section for fastening to a fastening part of the scraper
on the back end. Moreover this invention also relates to a hand
scraper, long-handled scraper or stripper, for scraping materials
off a substrate with a fastening part for fastening a scraper
blade.
[0003] 2. Description of Related Art
[0004] In building rehabilitation or the like, floor coverings,
wall coverings or roof coverings must often be removed from a
substrate, the floor, the wall or the roof. Often, these coverings,
especially building floor coverings, such as PVC floors, carpeted
floors, parquet or laminate floors, generally a floor or floor
planks, are fixed to the substrate with cement. In these cases the
coverings and cement layers adhere especially strongly to the
substrate. To detach these coverings and/or cement layers,
scrapers, such as, for example, hand scrapers, long-handled
scrapers, or strippers are used, the known scrapers having a
fastening part for fastening a scraper blade. By forward movement
of the front cutting edge of the scraper blade along the substrate
the materials to be removed are scraped off the substrate. The
scraper blades are made of a flat metallic material or a piece of
sheet metal which on one end has a fastening section which can be
clamped between an upper fastening piece and a lower fastening
piece of the fastening part. The fastening pieces of the fastening
part are made such that, when the fastening pieces are joined, a
recess is formed for holding the scraper blade.
[0005] In the course of scraping, the material parts which have
already separated from the substrate are transported in the
direction to the fastening part by the following scraped-off
material on the top of the scraper blade. The scraped-off materials
push against the fastening part; this leads to damage of the
fastening part and to increased wear in this region. In particular,
for manually actuated scrapers, the scraped-off material components
coming into contact with the fastening part leads, otherwise, to
increased resistance when the substrate is being scraped, so that
removing material from the substrate is tedious. If material
components cannot be scraped off the substrate during scraping,
they can push against the fastening part on the bottom of the
scraper blade as the scraper blade continues to be advanced; this
likewise can lead to increased wear of the fastening part and to
increased expenditure of force during scraping.
SUMMARY OF THE INVENTION
[0006] The object of this invention is to make available a scraper
blade and a scraper of the initially named type with which it is
easily possible to detach materials from a substrate with low wear
of the scraper and with low expenditure of force.
[0007] The aforementioned object is achieved by a scraper blade in
which there is at least one guide section for diverting the
scraped-off material over at least a front pushing edge of the
fastening part, and the guide section can be obtained by forming of
the flat metallic material. In this connection, the at least one
guide section for diverting the scraped-off material over at least
one front pushing edge of the fastening part has the highest point
of a top-side guide surface located above the upper pushing edge
and/or the low point of a bottom-side guide surface is located
underneath the lower pushing edge of the fastening part or is
aligned with the pushing edge, it being further provided in
accordance with the invention that the guide section can be
obtained by shaping of the flat metallic material.
[0008] The guide section ensures that, during scraping, the
scraped-off material components cannot come into contact with the
front, for example, the face-side pushing edge of the fastening
part. The guide section automatically guides the following,
scraped-off material past the upper or lower pushing edge of the
fastening part so that wear on the fastening part does not occur
when the material is being scraped off and the scraping process
requires only little compressive force. The guide section has a
guide surface on the top side which is angled and/or bent relative
to the scraping surface in order to ensure diversion of the
scraped-off material. In the direction to the front scraping or
cutting edge the guide section of the scraper blade passes without
interruption into the scraping section. Fundamentally, it is also
possible for the scraper blade to run in an arc with a uniform
direction of curvature, extending from the front scraper edge to
the highest point of the top-side guide surface, the transition
between the scraping surface and guide surface being fluid.
However, preferably, the scraping surface is made as a straight or
plane section of the scraper blade, the transition of the scraping
surface to the guide surface taking place continuously and the
surfaces bordering one another being aligned. In this way, the
diversion of the scraped-off material is simplified.
[0009] If the low point of the bottom guide surface of the guide
section is located underneath the lower pushing edge of the
fastening part or is aligned with the pushing edge, the lower guide
surface, during scraping, ensures that the fastening part with the
face side does not hit against the material components which have
not been scraped off in the scraping process and which are adhering
strongly to the substrate. Then, in the forward motion of the
scraper, in any case slight, lifting of the fastening part takes
place as a result of the material components which have not been
scraped off. Otherwise, the scraped-off material components on the
bottom of the scraper blade are also routed past the fastening
part.
[0010] The term "forming" for the purposes of the invention is
defined as a generic term for all production processes in which
metals are plastically transferred into another form (shaped) in a
controlled manner. Plastic deformations of metallic materials take
place by flow, deformations taking place as the load increases. The
forming processes which can be used in conjunction with the
invention include, for example, compressive forming,
tension-pressure forming, tensile deformation, and bending.
[0011] The flat metallic material, preferably, has an essentially
uniform thickness in the scraping direction over the entire
extension of the scraper blade. In this connection, the concept
"essentially" takes into account the circumstance that unwanted
minor alterations of the sheet metal thickness can occur during
forming. By using forming methods, large numbers of scraper blades
in accordance with the invention can be easily and economically
produced. Otherwise, it is easily possible to form the flat
metallic material at certain locations in a controlled manner, and
the shape and size of the forming regions can be fixed if
necessary. By using forming methods, flat metallic materials with
very small thickness can be used as scraper blades and accordingly
guide sections can be made in the flat material.
[0012] Moreover, a covering can be easily scraped off the substrate
due to the low thickness of the material. Otherwise, grinding of
the scraper blade is easily possible, the ground scraper blades
having greater sharpness than, for example, scraper blades which
can be machined out of a flat metallic material by cutting.
Compared to these flat materials with a greater thickness, the
scraper blades of thin sheet metal in accordance with the invention
also have higher flexibility which makes it easier to penetrate
into the area between a covering and a substrate during scraping.
In this connection, the scraper blade in accordance with the
invention can have a thickness from 0.25 to 2.0 mm, preferably
between 0.5 to 1.5 mm, especially between 0.75 to 1.0 mm.
[0013] The width of the scraper blades which are used for manually
actuated scrapers can be between 15 to 30 mm, preferably roughly 20
mm. The length of the aforementioned scraper blades, in this case,
is between 100 to 300 mm, preferably up to 200 mm. Scraper blades
for so-called strippers can extend transversely to the scraping
direction over a length from 200 to 400 mm, and the extension of
the scraper blades in the scraping direction can be between 40 to
80 mm, preferably roughly 60 mm. Otherwise, the scraper blades of
the type under consideration are, for the most part, rectangular
with partially rounded corners. In order to ensure that the blade
is securely held on the scraper, the scraper blade is preferably
clamped over the entire extension of the blade transversely to the
scraping direction in the fastening part.
[0014] The scraper blade can also be hardened differently, and in
the region of the scraping edge the scraper blade should have the
greatest hardness. This contributes to low wear of the scraper
blade during the scraping process.
[0015] Preferably, the guide section passes without interruption
into the fastening section. The guide section in this case can be
obtained by impressing the metallic flat material without tearing
or pushing through the material. In this case, the scraper blade
has a continuous surface over its entire length and width so that
the scraped-off material components can be diverted essentially
completely over the guide section. In another embodiment of the
invention, the guide section can be obtained by bending the punched
sheet metal region up or down so that in the scraping process the
scraper blade has an interruption in the transition region between
the guide section and the fastening section.
[0016] The fastening section can be made as a straight or plane
clamping region; this enables secure clamping in the fastening part
of the scraper. Moreover, there can be a holding region which is
angled and/or bent relative to the clamping region and which passes
into the guide section, and furthermore, preferably the holding
region can be bent or angled up and/or down by roughly 30.degree.
to 90.degree. relative to the clamping region. In the corresponding
execution of the fastening part, the holding region can contribute
to secure fixing of the scraper blade in the fastening part. In
this connection, for a scraper of the initially named type it can
be provided that the recess formed between the fastening pieces of
the fastening part have a first, preferably plane recess region for
the clamping region of the fastening section and a second recess
region connected to the first recess region for the holding region
of the fastening section, the second recess region being bent
and/or angled relative to the first recess region and the second
recess region having the exit opening.
[0017] In this connection, the exit opening of the recess is
preferably on the top or the bottom of the fastening part, and the
planar fastening section of the blade can be clamped essentially
horizontally between the fastening pieces. In this embodiment, the
exit opening is not in the region of the center longitudinal axis
of the fastening part. The shape of the recess between the
fastening pieces in the scraping direction is matched here to the
shape of the fastening section of the scraper blade.
[0018] Fundamentally however, it is also possible for the holding
region of the scraper blade after clamping into the fastening part
to be located outside the fastening part, for example, on a face
side of the fastening part adjoining the holding region so that the
scraper blade in the scraping process is securely held on the
fastening part and some of the compressive force necessary in
scraping is delivered into the scraper blade via the holding
region.
[0019] In order to simplify the scraping-off of covering residues,
the scraping section can be a planar, flat region. The scraping
section and the clamping region of the fastening section can,
moreover, be located in a common plane, the guide section being
bent and/or angled up and/or down relative to the plane. If the
scraping section and the clamping region of the fastening section
are located in a clamping plane, high compressive forces can be
easily transferred to the substrate by way of the scraper blade
during scraping.
[0020] The guide section preferably has an ascending slope and/or a
descending slope of less than 30.degree., preferably less than
20.degree.. In this way, reliable and complete diversion of the
scraped-off materials is ensured with low expenditure of force and
the forming effort in production of the guide section is reduced.
The holding region of the fastening section and the guide section
can have the same ascending slope or the same descending slope so
that the scraper blade, in accordance with the invention, has a
corrugated profile in a longitudinal section whose flanks are
formed by the holding region, on the one hand, and the guide
section, on the other. This embodiment can be easily produced and
enables scraping with a low expenditure of force.
[0021] The distance between the highest point of the top-side guide
surface or the low point of the bottom-side guide surface and the
center longitudinal axis of the scraping section and/or the center
longitudinal axis of the fastening section of the blade can be less
than 10 mm, preferably less than 5 mm, especially less than 3 mm.
In this way, the forming cost is reduced and the routing of force
through the scraper blade is disrupted only a little relative to
the routing of force through a straight or plane, unformed scraper
blade.
[0022] As has already been pointed out above, the scraping surface
and the guide surface should be aligned in order to ensure simple
diversion of the scraped-off material. In this connection, the
guide section in the transition region to the fastening section can
have a rounded diversion edge which leads to the scraped-off
material being automatically detached from the scraper blade by the
material which follows in the scraping process and being
transported away beyond the pushing edge of the fastening part.
[0023] Fundamentally, it is possible for the guide section to
extend transversely to the scraping direction over the entire
scraper blade. In order to enable removal of the material adhering
to the scraper blade, on the one hand, and on the other, the
diversion of material past the pushing edge of the fastening part,
there can also be a plurality of guide sections, the guide sections
extending transversely to the scraping direction in regions over
the scraper blade. The guide sections can be obtained by forming of
the metallic flat material in sections. In this connection, the
guide sections in one preferred embodiment of the invention are
located next to one another transversely to the scraping direction
and spaced apart from one another. Therefore, there is a continuous
row of formed regions of the scraper blade which are surrounded by
regions which have not been formed.
[0024] In a hand scraper, the scraper blade is preferably ground on
both sides. The front end of the scraping section are beveled on
the bottom and top so that the two sides of the scraper blade can
be used for scraping. Unilateral grinding of one scraper blade in
the scraping process can, however, be advantageous since the blade
sharpens itself in the scraping process. In this connection,
scraper blades ground on one side are usable preferably in
stripping.
[0025] The invention is explained in further detail below with
reference to the embodiments described by way of example in
conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0026] FIG. 1 shows a scraper known from the prior art with a
scraper blade for scraping materials off a substrate,
[0027] FIG. 2 shows a first embodiment of a scraper in accordance
with the invention in a longitudinal side view,
[0028] FIG. 3 shows a second embodiment of a scraper in accordance
with the invention in a longitudinal side view,
[0029] FIG. 4 shows a third embodiment of a scraper in accordance
with the invention in a longitudinal side view,
[0030] FIG. 5 shows a fourth embodiment of a scraper in accordance
with the invention in a longitudinal side view,
[0031] FIG. 6 shows a fifth embodiment of a scraper in accordance
with the invention in a longitudinal side view,
[0032] FIG. 7 shows a sixth embodiment of a scraper in accordance
with the invention in a longitudinal side view,
[0033] FIG. 8 shows a seventh embodiment of a scraper in accordance
with the invention in a longitudinal side view,
[0034] FIG. 9 shows a scraper blade in accordance with the
invention in a longitudinal side view,
[0035] FIG. 10 shows another scraper blade in accordance with the
invention in a longitudinal side view,
[0036] FIG. 11 shows a top view of the scraper blade of the scraper
shown in FIG. 2,
[0037] FIG. 12 shows a top view of the scraper blade of the scraper
shown in FIG. 7,
[0038] FIG. 13 shows a top view of a first embodiment of a scraper
blade of the type shown in FIG. 9,
[0039] FIG. 14 shows a second embodiment of a scraper blade of the
type shown in FIG. 9 in a top view,
[0040] FIG. 15 shows a third embodiment of a scraper blade of the
type shown in FIG. 9 in a top view,
[0041] FIG. 16 shows a top view of the scraper blade shown in FIG.
8, and
[0042] FIG. 17 is a perspective view showing the scraper blade in
accordance with the embodiment of FIG. 16 with guide sections in
accordance with FIG. 10 attached to a hand scraper.
DETAILED DESCRIPTION OF THE INVENTION
[0043] FIG. 1 shows a hand scraper 1 which is known from the prior
art and which has a fastening part 2 and a scraper blade 3. The
fastening part 2 is made in two pieces and has an upper fastening
piece 4 and a lower fastening piece 5. The scraper 1 is designed
for scraping materials (not shown) off a substrate, the scraper
blade 3 having a bevel 6 on the bottom of the front end the scraper
blade 3 that is angled upward and forward toward the scraping
surface 7. The scraper blade 3 is clamped into a recess which is
formed between the upper fastening piece 4 and the lower fastening
piece 5, from the middle region to the back end so that the rear
end face 8 of the scraper blade 3 acting against a shoulder of the
lower fastening part 5 during scraping.
[0044] In the scraping process in the scraping direction X, the
scraped-off material components are transported opposite the
scraping direction X on the scraping surface 7 and possibly also
along the bottom of the scraper blade 3 in the direction to the
front face side 9 of the fastening part 2. This is shown
schematically by the arrows Y. The material components push against
the end face surfaces 9, the end face surfaces 9 constituting the
pushing edges for the purposes of the invention. When the
scraped-off material comes into contact with the pushing edges of
the fastening part 2, abrasion occurs on the outer surface of the
fastening part 2; this can lead to destruction of the hand scraper
1 and endangers secure attachment of the scraper blade 3 between
the fastening pieces 4, 5. Otherwise, the expenditure of force
which is necessary in the scraping process for scraping off the
material component increases.
[0045] FIGS. 2 to 16 each show scraper blades 10 which is made of a
flat metallic material and which are made for use in the scraper 11
shown in FIGS. 2 to 8 for scraping materials off of a substrate.
The front end of the scraper blade 10 has a scraping section 13
which has at least one scraping surface 12, and the illustrated
scraper blades 10 can have scraping sections 13 of different
length. Otherwise, each scraper blade 10 has a fastening section 14
on its back end for fastening to a fastening part 15 of the scraper
11. The fastening part 15 is, likewise, made in two parts and has
an upper fastening piece 16 and a lower fastening piece 17.
[0046] Each scraper blade 10 has at least one middle guide section
18 for diverting the scraped-off material over at least one front
pushing edge 19 of the fastening part 15, and the guide section 18
can be obtained by forming of the scraper blade 10. As follows from
FIGS. 6 to 8, the scraper blade 10 can have a guide section 18 with
a top-side guide surface for diverting the scraped-off material
over the upper pushing edge 19 and another guide section 20 with a
bottom-side guide surface 29 for diverting the scraped-off material
over the lower pushing edge 21. In the embodiments shown in FIGS. 2
and 5, the scraped-off material on the bottom of the scraper blade
10 is diverted by the center longitudinal axis X.sub.1 of the
scraping section 13 being offset down relative to the center
longitudinal axis X.sub.2 of the plane part of the fastening
section 14 so that, during scraping, the scraped-off material does
not push against the lower pushing edge 21.
[0047] Diverting the scraped off material over the guide section
18, 20 ensures that wear of the fastening part 15 in the region of
the front pushing edge 19, 21 by the scraped-off material cannot
take place. Thus, a floor covering can be scraped off with less
expenditure of force by diverting the scraped-off material.
[0048] The guide section 18 is bent and/or angled up and/or down
relative to the scraping section 13 which is planar or which runs
straight, and the guide section 18, 20 preferably can have an
ascending slope and/or a descending slope of less than 30.degree.,
preferably less than 20.degree.. In the scraper blades 10 shown in
FIGS. 6 and 7, the descending slope of the further guide section 20
conversely is roughly 30.degree. to 45.degree. in order to ensure
reliable diversion of the scraped-off material on the bottom.
Otherwise, in all embodiments it is such that the scraping section
13 passes without interruption into the guide section 18, the
scraping surface 12 and the top-side guide surface 22 of the guide
section 18 being aligned. It is not shown that the scraper blade 10
between a highest point 23 of the top-side guide surface 22 and the
scraping edge 24 can run in an arc shape with a rectified
curvature.
[0049] The scraper blades 10 in the scraping direction X have an
essentially constant thickness d over the entire extension, and the
thickness can be between 0.25 to 2 mm, preferably between 0.5 to
1.5 mm. In the embodiments shown in FIGS. 2 to 5, the scraping
section 13 is offset down to such an extent that during scraping
there is no danger that the face side of the lower fastening part
17 will come into contact with the material components which have
not been scraped off or with irregularities of the floor. In the
embodiments shown in FIGS. 3 and 4 as well as 6 to 8, the scraping
section 13 made as a plane flat region and the plane clamping
region 25 of the fastening section 14 are located in a common
plane, the guide section 18, 20 being bent or angled up or down
relative to the common plane.
[0050] The fastening section 14 can have a holding region 26 which
is bent and/or angled relative to the clamping region 25, as is
shown in FIGS. 2, 3, 4, 5 and 7. For this purpose a recess formed
between the upper fastening piece 16 and the lower fastening piece
17 of the fastening part 15 has a first, preferably plane recess
region for the clamping section 25 of the fastening section 14 and
a second recess region connected to the first recess region for the
angled and/or bent holding region 26 of the fastening section 14,
the second recess region being bent and/or angled relative to the
first recess region. In this way secure support of the scraper
blade 10 on the fastening part 15 is ensured. In the embodiments
shown in FIGS. 2, 3 and 4 the upper fastening piece 16 has an exit
opening 27 for the scraper blade 10. In the embodiment shown in
FIG. 7, the exit opening is in the lower fastening piece 17, the
second recess region running into the exit opening 27. As follows
from FIG. 5, the fastening part 15 can also strike the holding
region 26 with the face side so that in the scraping process the
scraper blade 10 is securely held on the fastening part 15 and the
transmission of force is simplified. In the embodiment shown in
FIG. 5 the holding region 26 is thus located outside the fastening
part 15.
[0051] As follows especially from FIG. 3, the holding region 26 of
the fastening section 14 and the guide section 18 can have the same
ascending slope so that the scraper blade 10 shown in FIG. 3 has a
profile corrugation in a longitudinal sectional view. The profile
shown in FIG. 3 can be easily produced.
[0052] Otherwise, due to the low thickness d of the scraper blades
10 for diverting the scraped-off material it is simply necessary to
form the scraper blade 10 to a minor degree. The distance a.sub.1,
a.sub.2, a.sub.3 between the highest point 23 and/or the low point
28 of the guide surface 22, 29 and the center longitudinal axis
X.sub.1 of the scraping section 13 and/or the center longitudinal
axis X.sub.2 of the clamping region 25 of the fastening section 14
can therefore be less than 10 mm, preferably less than 5 mm,
especially less than 3 mm. This is shown schematically in FIGS. 2
and 7.
[0053] Otherwise the scraper blade 10 in the transition region of
the guide section 18 to the fastening section 14 is rounded in
order to prevent the scraped-off material from striking the scraper
blade 10 in this region and to promote release of the scraped-off
material from the scraper blade 10.
[0054] Otherwise, the scraper section 13 can be beveled on the
bottom and/or on the top in the region of the scraping edge 24. The
embodiments shown in FIGS. 6 to 8 have scraper blades 10 which are
ground on both sides. The selected shaping of the scraper blades 10
with an upper guide section 18 and a lower guide section 20, as is
shown in FIGS. 6 and 7, or guide sections 18, 20 arranged
mirror-symmetrically as shown in FIG. 8, make it possible to use
the scraper blade 10 on both sides for scraping and at the same
time to route the material which has been scraped off past the
fastening part 15.
[0055] FIGS. 9 and 10 show two other embodiments of scraper blades
10, the scraper blade 10 shown in FIG. 9 having a guide section 18
which can be obtained by stamping the scraper blade 10. The scraper
blade 10 in this case has an uninterrupted profile which extends
from the front scraping edge 24 to the back end of the fastening
section 14. In the embodiment shown in FIG. 10, conversely the
guide section 18 is obtained by punching out a portion of the
scraper blade 10 and by subsequently bending up the punched out
region. In this case, the scraper blade 10 is interrupted in the
transition region between the fastening section 14 and the guide
section 18.
[0056] FIG. 11 shows the scraper blade 10 shown in FIG. 2 in a view
from the top. FIG. 12 shows the scraper blade shown in FIG. 7 in a
view from the top. As follows from FIGS. 11 and 12, the guide
sections 18, 20 extend over the entire width of the scraper blade
10. However, the guide section can also extend only in regions of
the scraper blade 10, as is shown in FIG. 13, which is a top plan
view of the scraper blade 10 shown in FIG. 9.
[0057] FIGS. 14 to 16 show other ways in which the scraper blades
10 can be formed with a plurality of guide sections 18, 20, the
guide sections 18, 20 extending transversely to the scraping
direction in-line with and spaced apart from one another across the
scraper blade 10. The guide sections 18, 20 can be obtained by
pressing the flat material in or up. As shown in FIGS. 16 & 17,
it can also be provided that there are guide sections 18, 20 bent
or angled in different directions in an alternating series with
respect to one another. In this way, on the one hand, the diversion
of the scraped-off material from the scraper blade 10 is ensured.
On the other hand, detachment of the scraped-off material from the
scraper blade 10 is facilitated.
* * * * *