U.S. patent application number 12/498841 was filed with the patent office on 2010-01-14 for tool having a mounting opening for positive connection to different drive shafts.
Invention is credited to Uwe Frueh.
Application Number | 20100009613 12/498841 |
Document ID | / |
Family ID | 41165536 |
Filed Date | 2010-01-14 |
United States Patent
Application |
20100009613 |
Kind Code |
A1 |
Frueh; Uwe |
January 14, 2010 |
Tool Having A Mounting Opening For Positive Connection To Different
Drive Shafts
Abstract
A tool is disclosed having a mounting opening for positive
connection to a drive shaft that can be driven oscillatingly, the
mounting opening comprising a plurality of outwardly extending
projections each having an outer convex section that ends on both
sides in concave lateral flanks, with neighboring lateral flanks
joining each other on their way toward the center axis of the
mounting opening to form a common bulge, concave on the outside,
the shape of the outwardly extending projections, of the lateral
flanks and of the bulges being such that there can be effected,
optionally, either a positive connection to a first raised securing
section of a first drive shaft, having a plurality of outwardly
extending convex raised portions each having a rounded tip and
rounded concave lateral flanks, or, optionally, a positive
connection to a second securing section of a second drive shaft,
having a plurality of raised positive-connection elements arranged
in regular intervals on a circular line.
Inventors: |
Frueh; Uwe; (Sonnenbuehl,
DE) |
Correspondence
Address: |
ST. ONGE STEWARD JOHNSTON & REENS, LLC
986 BEDFORD STREET
STAMFORD
CT
06905-5619
US
|
Family ID: |
41165536 |
Appl. No.: |
12/498841 |
Filed: |
July 7, 2009 |
Current U.S.
Class: |
451/559 ;
30/296.1 |
Current CPC
Class: |
B24B 45/00 20130101;
B24B 23/04 20130101; B25F 5/00 20130101 |
Class at
Publication: |
451/559 ;
30/296.1 |
International
Class: |
B24D 11/00 20060101
B24D011/00; B24B 23/04 20060101 B24B023/04 |
Foreign Application Data
Date |
Code |
Application Number |
Jul 8, 2008 |
DE |
20 2008 009 525.5 |
Claims
1. A tool having a mounting opening configured for positive
connection to a drive shaft that can be driven oscillatingly about
its longitudinal axis, the mounting opening comprising a plurality
of outwardly extending projections each having an outer convex
section ending on both sides in concave lateral flanks, with
neighboring lateral flanks joining each other on their way toward
the center axis of the mounting opening to form a common bulge,
concave on the outside; wherein said projections have outer ends
and said bulges have inner ends, both said outer ends and said
inner ends being arranged along circles concentric to said center
axis; and wherein said outwardly extending projections, said
lateral flanks and said bulges define a shape of the mounting
opening being matched to a first raised securing section of a first
drive shaft and to a second raised securing section of a second
drive shaft, so as to allow, optionally, either a positive
connection to said first raised securing section of said first
drive shaft, having a plurality of outwardly extending convex
raised portions each having a rounded tip and rounded concave
lateral flanks, or, optionally, a positive connection to said
second raised securing section of said second drive shaft, having a
plurality of raised positive-connection elements of rectangular or
substantially trapezoidal shape, arranged in regular intervals on a
circular line.
2. A tool having a mounting opening configured for positive
connection to a drive shaft that can be driven oscillatingly about
its longitudinal axis, the mounting opening comprising a plurality
of outwardly extending projections each having an outer convex
section ending on both sides in concave lateral flanks, with
neighboring lateral flanks joining each other on their way toward
the center axis of the mounting opening to form a common bulge,
concave on the outside; wherein said outwardly extending
projections, said lateral flanks and said bulges define a shape of
the mounting opening so as to allow, optionally, either a positive
connection to a first raised securing section of a first drive
shaft, having a plurality of outwardly extending convex raised
portions each having a rounded tip and rounded concave lateral
flanks, or, optionally, a positive connection to a second raised
securing section of a second drive shaft, having a plurality of
raised positive-connection elements arranged in regular intervals
on a circular line.
3. The tool of claim 2, wherein said mounting opening has a shape
so as to allow a positive connection to said second raised securing
section of said second drive shaft, having a plurality of raised
positive-connection elements of rectangular or substantially
trapezoidal shape arranged on a circular line.
4. The tool of claim 1, wherein said projections have outer ends
and said bulges have inner ends, both said outer ends and said
inner ends being arranged along circles concentric to said center
axis.
5. The tool of claim 1, wherein said mounting opening has a total
number N of projections, wherein said first raised securing section
comprises n, convex raised portions, wherein said second raised
securing section comprises a total of n.sub.2 positive-connection
elements, and wherein said total number N is an integral multiple
of n, convex raised portions and of n.sub.2 positive-connection
elements.
6. The tool of claim 2, wherein said mounting opening has a total
number N of projections, wherein first raised securing section
comprises n, convex raised portions, wherein said second raised
securing section comprises a total of n.sub.2 positive-connection
elements, and wherein said total number N is an integral multiple
of n, convex raised portions and of n.sub.2 positive-connection
elements.
7. The tool of claim 5, wherein said total number N is 12, said
number n, of said convex raised portions is 3, 4, 6 or 12, and said
number n.sub.2 of said positive-connection elements is 3, 4, 6 or
12.
8. The tool of claim 6, wherein said total number N is 12, said
number n, of said convex raised portions is 3, 4, 6 or 12, and said
number n.sub.2 of said positive-connection elements is 3, 4, 6 or
12.
9. The tool of claim 1, wherein said mounting opening is configured
as a stamped opening.
10. The tool of claim 2, wherein said mounting opening is
configured as a stamped opening.
11. The tool of claim 1, which is configured as a grinding
tool.
12. The tool of claim 1, which is configured as a scraping
tool.
13. The tool of claim 1, which is configured as a sawing tool.
14. The tool of claim 2, which is configured as a grinding
tool.
15. The tool of claim 2, which is configured as a scraping
tool.
16. The tool of claim 2, which is configured as a sawing tool.
Description
BACKGROUND OF THE INVENTION
[0001] The present invention relates to a tool having a mounting
opening for positive connection to a first drive shaft that can be
driven oscillatingly and which comprises a first raised securing
section having a plurality of convex raised portions each extending
toward the outside and provided with a rounded tip and rounded
convex lateral flanks.
[0002] The invention further relates to a tool having a mounting
opening for positive connection to a second drive shaft that can be
driven oscillatingly and which comprises a second securing section
having a plurality of raised positive-connection elements of
substantially trapezoidal shape arranged in regular intervals along
a circular line.
[0003] A tool of the first-mentioned kind is known from U.S. Pat.
No. 6,945,862.
[0004] According to this document, which is incorporated herein in
full by reference, a drive shaft of an oscillating drive, that can
be driven oscillatingly, is provided with a raised securing section
on which are provided a total of four raised portions, each
extending from a circular line to the outside and provided with a
rounded tip and with rounded convex lateral flanks.
[0005] A tool having an mounting opening with recesses of matching
shape can be mounted on such a securing section in form-locking
fashion.
[0006] From US 2008/0190259 A1, which is also incorporated herein
in full by reference, there is further known a tool having an
mounting opening for positive connection to a second drive shaft
that can be driven oscillatingly, the second oscillatingly driven
drive shaft comprising a second raised securing section provided
with a total of twelve raised positive-connection elements of
substantially trapezoidal shape that are arranged along a circular
line at regular intervals. A matching tool that is to be mounted on
that securing section is provided with corresponding recesses
adapted to that shape. In that case, too, the angle of the tool
relative to the drive shaft can be adjusted.
[0007] The tools that are to be connected to the different drive
shafts are provided with corresponding mounting openings matched to
the shapes of the different securing sections of the drive
shafts.
[0008] It is, therefore, necessary that different tools be held on
stock for the different drive shafts.
SUMMARY OF THE INVENTION
[0009] It is a first object of the present invention to disclose a
tool having a mounting opening suited for positive connection to
the different kinds of drive shafts mentioned above.
[0010] It is a second object of the invention to disclose a tool
having a mounting opening that allows an angular adjustment of the
tool relative to a drive shaft on which it is attached.
[0011] It is a third object of the invention to disclose a tool
having a mounting opening suitable for attachment on different
oscillatingly driven drive shafts, thereby allowing larger volumes
in the production of tools and reducing inventory needs.
[0012] These and other objects of the invention are achieved by a
tool having a mounting opening for positive connection to a drive
shaft that can be driven oscillatingly, the mounting opening
comprising a plurality of outwardly extending projections each
having an outer convex section that ends on both sides in concave
lateral flanks, with neighboring lateral flanks joining each other
on their way toward the mounting opening to form a common bulge or
apex, concave on the outside, the form of the outwardly extending
projections, of the lateral flanks and of the bulges being such
that there can be effected, optionally, either a positive
connection to a first raised securing section of a first drive
shaft, having a plurality of outwardly extending convex raised
portions each having a rounded tip and rounded concave lateral
flanks, or a positive connection to a second securing section of a
second drive shaft having a plurality of raised positive-connection
elements that are arranged in regular intervals on a circular
line.
[0013] A tool according to the invention allows a positive
connection to be effected, by mounting it on the securing section
of the respective shaft, to both a first drive shaft having a
plurality of outwardly projecting concave raised portions each
having a rounded tip and rounded concave lateral flanks, and to a
second drive shaft having a second securing section which latter
comprises a plurality of raised positive-connection elements of
trapezoidal shape arranged in regular intervals along a circular
line.
[0014] In this way, it is possible to use a single tool for
positive connection to a first drive shaft and also for positive
connection to a second drive shaft.
[0015] One thereby obtains clearly greater quantities for the
respective tools so that as a result corresponding cost savings can
be achieved and it is no longer necessary to produce and distribute
different tools serving the same purpose for the different drive
shafts.
[0016] One achieves in this way considerable savings in terms of
costs and logistics.
[0017] According to a further embodiment of the invention, the
outer ends of the projections and the inner ends of the bulges,
respectively, are arranged along circles concentric to the center
axis. Also preferably, the raised positive-connection elements that
are arranged on a circular line have a rectangular or substantially
trapezoidal shape.
[0018] The design of the mounting opening is preferably symmetrical
relative to the center axis.
[0019] This allows a positive connection to be achieved with both
known mounting systems.
[0020] According to a further embodiment of the invention, the
number of projections of the mounting opening is an integral
multiple of the number of the convex raised portions of the first
securing section and of the number of the trapezoidal
positive-connection elements of the second securing section.
[0021] This allows the tool to be adjusted in angular position
relative to the drive shaft. When the number of projections of the
mounting opening is a multiple of the number of the convex raised
portions of the first securing section or of the number of
trapezoidal positive-connection elements of the second securing
section, then the tool can be secured on the drive shaft at even
smaller angular increments than would be defined by the number of
convex raised portions of the first securing section or the number
of trapezoidal positive-connection elements of the second securing
section.
[0022] In that connection, the number of projections of the
mounting opening may, for example, be twelve and the number of
convex raised portions or of trapezoidal positive-connection
elements may be three, four, six of twelve.
[0023] According to a further embodiment of the invention, the
mounting opening is configured as a stamped opening.
[0024] This permits the mounting opening to be produced easily and
at low cost.
[0025] According to a preferred embodiment of the invention, the
tool may, for example, be a grinding tool, a cutting tool or a
sawing tool.
[0026] It is understood that the features of the invention
mentioned above and those yet to be explained below can be used not
only in the respective combination indicated, but also in other
combinations or in isolation, without leaving the scope of the
invention.
BRIEF DESCRIPTION OF THE DRAWINGS
[0027] Further features and advantages of the invention will become
apparent from the description that follows of certain preferred
embodiments, with reference to the drawing. In the drawing
[0028] FIG. 1 shows a perspective view of an exemplary design of a
tool provided with a mounting opening according to the
invention:
[0029] FIG. 2 shows a perspective view of a first drive shaft of an
oscillating drive with a raised securing section, designed for
positive connection to a mounting opening of the tool according to
FIG. 1;
[0030] FIG. 3 shows a perspective view of a second drive shaft of a
second oscillating drive with a securing section for connection to
the mounting opening of the tool according to FIG. 1, likewise in
form-locking fashion; and
[0031] FIG. 4 shows a schematic side view of an oscillating drive
with a drive shaft according to FIG. 2, and a tool according to
FIG. 1 mounted on it.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0032] FIG. 1 shows a perspective view of an exemplary embodiment
of a tool according to the invention, designated generally by
reference numeral 10. In the illustrated case, the tool 10
comprises a triangular working surface 12 with rounded tips and
convex outer edges extending between the tips. The working surface
12 may be coated with a sanding material directly, or may be
designed for having a sanding disk of corresponding shape and size
secured to it. A mounting opening 16 is accommodated in an offset
portion 14 in the middle of the surface, in recessed relation to
the working surface 12.
[0033] The mounting opening 16 comprises a total of twelve
outwardly extending projections 20 each provided with an outer
convex section 22 that ends on both sides in a respective concave
lateral flank 24. On their way to the center axis 18 of the
mounting opening 16, neighboring lateral flanges 24 join each other
to form a common bulge 26 of concave shape on the outside. The
outer ends of the convex sections 22 and the inner ends of the
concave bulges 26, respectively, are arranged on circles concentric
to the center axis 18 of the mounting opening 16. Generally, the
mounting opening 16 is symmetrical relative to the center axis 18.
Thus the projections 20 are arranged at equal angular intervals
between each other.
[0034] FIG. 2 shows a matching first drive shaft 30 of an
oscillating drive (FIG. 4) with a raised first securing section 38
according to U.S. Pat. No. 6,945,862. The drive shaft 30, that can
be driven oscillatingly about its longitudinal axis 32 in the
direction indicated by arrow 34, comprises a flange 36 that serves
as an abutment for the tool 10. A mounting opening 16 of the tool
10 can be mounted on the securing section 38 so that a positive
connection is effected.
[0035] As a safety measure, a securing screw 72 is used, for
example, that can be screwed into a corresponding threaded bore 46
in the drive shaft 30--see FIG. 4--in a manner such that the
securing screw 72 is countersunk within the offset portion 14.
[0036] As known from U.S. Pat. No. 6,945,862, the securing section
38 has a total of four convex raised portions 40 which extend from
a circle toward the outside and which have a rounded tip 42 and
rounded concave lateral flanks 44.
[0037] The shape of the mounting opening 16 of the tool 10 is
matched to the shape of the securing section 38 of the first drive
shaft 30 so that a positive connection to the drive shaft is
guaranteed. As the mounting opening 16 has a total of 12
projections 20, while the securing section 38 of the first drive
shaft 4 has four raised portions 40, it is now possible to secure
the tool on the drive shaft 36 in twelve angular positions offset
one from the other by 30.degree..
[0038] FIG. 3 shows a second drive shaft of a second oscillating
drive, indicated generally by reference numeral 50. That drive
shaft, too, can be driven by its associated oscillating drive
oscillatingly about its longitudinal axis 52, as indicated by the
double arrow 54. Again, there is provided a flange 56 on which a
mounting opening 58 is formed. The mounting opening comprises in
this case a total of twelve positive-connection elements 60 which
are arranged along a circular line concentric to the center axis 52
and which have a trapezoidal shape, for example, and are raised
toward the top (in principle, they may of course also have a
rectangular or circular cross-section or any other cross-sectional
shape).
[0039] Now, the form of the mounting opening 16 of the tool 10 is
selected so that the tool 10 can be mounted on the first drive
shaft 30 or, alternatively, also on the second drive shaft 50,
being in each case positively held by its mounting opening 16. In
this case again, a threaded bore 46 serves to receive a screw that
is intended to secure the tool 10 on the drive shaft 50.
[0040] Details of the shape and design of the securing section 58
of the second drive shaft 50 can be taken from US 2008/0190259 A1,
which is fully incorporated herein by reference.
[0041] The oscillating drive 70 according to FIG. 4 is an
oscillating drive of a design known as such, which causes its drive
shaft 30 to perform rapid oscillating movements about the
longitudinal axis 32 of the drive shaft 30, at a frequency of, for
example, 5000 to 30000 oscillations per minute and with a small
oscillating angle of, for example, 0.5 to 5 degrees.
[0042] Such an oscillating drive may be equipped with a drive shaft
30 according to FIG. 2 or with a drive shaft 50 according to FIG.
3.
[0043] A tool having a mounting opening 16 according to the
invention can be mounted optionally on different oscillating drives
that are equipped with the first drive shaft 30 or with the second
drive shaft 50. A positive connection is guaranteed in both
cases.
* * * * *