U.S. patent application number 12/194070 was filed with the patent office on 2009-02-19 for method of removal of tool holder in a machine tool.
Invention is credited to Otto Baumann, Thomas Berndhardt, Sven Kageler, Hardy Schmid.
Application Number | 20090044960 12/194070 |
Document ID | / |
Family ID | 34970253 |
Filed Date | 2009-02-19 |
United States Patent
Application |
20090044960 |
Kind Code |
A1 |
Baumann; Otto ; et
al. |
February 19, 2009 |
Method of removal of tool holder in a machine tool
Abstract
A method of removing a tool holder having a protective sleeve
and at least one locking element and configured for receiving an
insertion tool in a machine tool having a fitting device, includes
removing the protective sleeve of the tool holder, complete removal
of the locking elements, and separation of the tool holder from the
fitting device.
Inventors: |
Baumann; Otto;
(Leinfelden-Echterdingen, DE) ; Berndhardt; Thomas;
(Aichtal-Groetzingen, DE) ; Schmid; Hardy;
(Stuttgart, DE) ; Kageler; Sven;
(Leinfelden-Echterdingen, DE) |
Correspondence
Address: |
STRIKER, STRIKER & STENBY
103 East Neck Road
Huntington
NY
11743
US
|
Family ID: |
34970253 |
Appl. No.: |
12/194070 |
Filed: |
August 19, 2008 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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10563190 |
Jan 3, 2006 |
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PCT/EP05/52762 |
Jun 15, 2005 |
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12194070 |
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Current U.S.
Class: |
173/1 |
Current CPC
Class: |
Y10T 279/17102 20150115;
Y10T 408/957 20150115; B25D 17/088 20130101; B23Q 3/12 20130101;
Y10T 279/17042 20150115 |
Class at
Publication: |
173/1 |
International
Class: |
B25D 17/00 20060101
B25D017/00; B25F 5/02 20060101 B25F005/02 |
Foreign Application Data
Date |
Code |
Application Number |
Jul 28, 2004 |
DE |
10 2004 036 587.3 |
Claims
1-12. (canceled)
13. A method of removing a tool holder having a protective sleeve
and at least one locking element and configured for receiving an
insertion tool in a machine tool having a fitting device, the
method comprising the steps of removing the protective sleeve of
the tool holder; complete removal of the locking elements; and
separation of the tool holder from the fitting device.
14. A method of removing a tool holder as defined in claim 13; and
further comprising, before said removing the protective sleeve,
removing at least one cap.
15. A method of removing a tool holder as defined in claim 14; and
further comprising, after said removing the cap, removing at least
one ring.
16. A method of removing a tool holder as defined in claim 15; and
further comprising, after said removing the ring, removing at least
one disc.
17. A method of removing a tool holder as defined in claim 16; and
further comprising, after said removing the disc, removing at least
one further ring.
Description
CROSS-REFERENCE TO A RELATED APPLICATIONS
[0001] This application is a division application of patent
application Ser. No. 10/563,190 filed on Jan. 3, 2006 from which it
claims the benefit of priority under 35 U.S.C. 120. The patent
application Ser. No. 10/563,190 in turn claims the benefit of
priority under 35 USC 119 from German Patent Application 10 2004
036 587.3, filed on Jul. 28, 2004.
BACKGROUND OF THE INVENTION
[0002] The present invention relates to a method of removing a tool
holder in a machine tool.
[0003] Rotary and percussion hammers are provided with fitting
devices for insertion tools. They are subject to a relatively great
deal of wear resulting from their operation, however. Wear of the
driving-element profile of a tool holder is a common cause of
failure. The machine tool must then undergo expensive service or it
must be scrapped if the repair costs are too high.
SUMMARY OF THE INVENTION
[0004] In accordance with the present invention, a method of
removing a tool holder having a protective sleeve and at least one
locking element and configured for receiving an insertion tool in a
machine tool having a fitting device, is proposed that includes
removing the protective sleeve of the tool holder, complete removal
of the locking elements, and separation of the tool holder from the
fitting device.
[0005] In accordance with the invention before the removing of the
protective sleeve, removing at least one cap can be performed.
[0006] In the inventive method, after the removing of the cap,
removing at least one ring can be carried out.
[0007] In the inventive method, after the removing of the ring,
removing at least one disc can be carried out.
[0008] Finally, after the removing of the disc, at least one
further ring can be removed.
[0009] Further embodiments, aspects and advantages of the present
invention also result independently of their wording in the claims,
without limitation to generality, from exemplary embodiments of the
present invention presented below with reference to the
drawing.
BRIEF DESCRIPTION OF THE DRAWINGS
[0010] FIG. 1 Shows a partial cross-section through a transmission
region of a preferred power tool;
[0011] FIG. 2 Shows a further partial cross-section through a
transmission region of a preferred power tool with details of a
preferred tool holder;
[0012] FIGS. 3 a, b Show a partial cross-section of a tool holder
in the installed state (a) and, in an exploded view, they show the
steps involved in removing the detachable, preferred tool holder
(b).
[0013] FIG. 4 A view schematically showing a method of removal of a
tool holder from the machine tool in accordance with the present
invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
[0014] FIGS. 1 through 3 show a preferred tool holder 17 in a
fitting device for an insertion tool (not shown) of a preferred
machine tool 10 designed as a rotary hammer, in various views.
[0015] FIG. 1 shows a partial cross-section through a transmission
region of preferred machine tool 10 with a housing 26 and a fitting
device located in housing 26, the fitting device enclosing tool
holder 17. Tool holder 17 is designed for receiving insertion tools
that can be inserted from the side of the fitting device covered
with a cap 11.
[0016] Tool holder 17 forms a sliding fit 18 with a drive tube 16
designed as a hammer tube, and is partially covered by this drive
tube 16. In the region of its free end, tool holder 17 is located
inside a protective sleeve 12 that is closed with a cap 11. Two
bore holes 13 are shown on the circumference of tool holder 17,
which serve to axially fix and non-rotatably connect tool holder 17
with drive tube 16. A total of four bore holes 13 are located on
the circumference of tool holder 17. More or fewer bore holes 13
can also be provided, of course. Bore holes 13 are covered by an
internal ring 23 of protective sleeve 12. Tool holder 17 is
retained with a spring 28 between retaining ring 29 and the end
face of drive tube 16, retaining ring 29 bearing against a shoulder
of protective sleeve 12 and holding a bearing 30 that is clamped
between retaining ring 29 and the shoulder. A gasket 31 is located
between tool holder 17 and drive tube 16 on tool holder 17 in the
region of sliding fit 18.
[0017] A further depiction of tool holder 17 in the inserted
position is explained in greater detail in FIG. 2. FIG. 2 shows a
further cross section through the transmission region of machine
tool 10 in FIG. 1, with details of preferred tool holder 17. Tool
holder 17 is connected with drive tube 16 around its outer diameter
and forms sliding fit 18 with drive tube 16. A driving-element
profile 15 that is susceptible to wear is located inside the tool
fitting such that an insertion tool (not shown) extends up to a
striking pin 25 of drive tube 16 configured as a hammer tube. The
insertion tool can therefore be driven in a rotary and/or
percussive manner.
[0018] FIGS. 3a and b show a partial cross-section of the
aforementioned tool holder in the installed state at an angle from
the front and, in an exploded view, they show the steps involved in
removing detachable, preferred tool holder 17.
[0019] A locking element 24 is shown close to the free end of
striking pin 25, locking element 24 being inserted in a bore hole
14 of drive tube 16 and in bore hole 13--designed as a blind
hole--of tool holder 17 such that tool holder 17 is secured axially
and non-rotatably with locking element 24, which is accessible from
an outer side of drive tube 16. Locking element 24 and/or all four
locking elements 24 are contained by inner ring 23 of protective
sleeve 12.
[0020] As shown in FIG. 3b, tool holder 17 can be easily removed
and, if necessary, replaced. First, cap 11 is pulled off with the
elements located behind it, i.e., a ring 20, a disk 21, and a ring
22. Rings 20, 22 are advantageously removed using pliers. It is
then possible to remove protective sleeve 12. Locking elements 24
are released as a result, locking elements 24 extending through
bore holes 14 of drive tube 16 into bore holes 13 of tool holder
17; they can also be removed using pliers. Tool holder 17, along
with spring 28, retaining ring 29, bearing 30 and gasket 31 located
thereon, can then be pulled out and replaced, if necessary. Tool
holder 17 is a compact unit with spring 28, retaining ring 29,
bearing 30 and gasket 31.
[0021] Once tool holder 17 is removed, striking pin 25--which is
now exposed--can be replaced, along with the no-load operation
ring.
[0022] FIG. 4 schematically shows the inventive method of removing
the tool holder.
[0023] In step a, the protective sleeve 12 is removed from the tool
holder 17. In step b, a complete removal of the locking elements 24
is performed. In step c, the tool holder 17 is separated from the
fitting device.
[0024] In accordance with the present invention, in an additional
step d, before the removal of the protective sleeve 12, first at
least one cap 11 is removed. In an additional step e, after the
removal of the cap 11, at least one ring 20 is removed. In step f,
after the removal of the ring 20, at least one disc 20 is removed.
Finally, in an additional step g after the removal of the disc 21,
at least one additional ring 22 is removed.
* * * * *