U.S. patent application number 13/425864 was filed with the patent office on 2013-03-21 for tool for removing drill cores from hammer drill bits.
The applicant listed for this patent is Thomas Hofbrucker, Jochen Meidlein. Invention is credited to Thomas Hofbrucker, Jochen Meidlein.
Application Number | 20130068529 13/425864 |
Document ID | / |
Family ID | 45655437 |
Filed Date | 2013-03-21 |
United States Patent
Application |
20130068529 |
Kind Code |
A1 |
Hofbrucker; Thomas ; et
al. |
March 21, 2013 |
Tool for Removing Drill Cores from Hammer Drill Bits
Abstract
An attachment for removing a drill core from a hollow volume of
a hollow drill bit, comprising an attachment sheath embodied to be
arranged at an accepting shaft comprising at least one ejection
element, which is embodied in the hollow volume of the hollow drill
bit and designed for transferring a force upon the drill core.
Inventors: |
Hofbrucker; Thomas;
(Mammendorf, DE) ; Meidlein; Jochen; (Munchen,
DE) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Hofbrucker; Thomas
Meidlein; Jochen |
Mammendorf
Munchen |
|
DE
DE |
|
|
Family ID: |
45655437 |
Appl. No.: |
13/425864 |
Filed: |
March 21, 2012 |
Current U.S.
Class: |
175/58 ;
175/249 |
Current CPC
Class: |
E21B 12/00 20130101;
B23B 51/0453 20130101; E21B 10/02 20130101 |
Class at
Publication: |
175/58 ;
175/249 |
International
Class: |
E21B 10/02 20060101
E21B010/02; E21B 12/00 20060101 E21B012/00 |
Foreign Application Data
Date |
Code |
Application Number |
Mar 22, 2011 |
DE |
102011005903.2 |
Claims
1. An attachment for removing a drill core from a hollow volume of
a hollow drill bit, said attachment comprising an attachment sheath
embodied for fastening at an accepting shaft having at least one
ejection element, which is embodied to engage the hollow volume of
the hollow drill bit and for transferring a force upon the drill
core.
2. An attachment according to claim 1, wherein the attachment
sheath is embodied as a centering sheath.
3. An attachment according to claim 1, wherein the ejection element
is embodied as an ejection pin.
4. An attachment according to claim 1 wherein in an impingement
part to be arranged and moved in a guided fashion between a distant
position and an impact area.
5. An attachment according to claim 4, wherein the impingement part
is embodied to transfer a force impacting the attachment
sheath.
6. An attachment according to claim 4, wherein the impingement part
is embodied to transfer an impacting force upon the ejection
element.
7. An attachment according to claim 1 wherein the attachment
comprises a multitude of ejection elements arranged annularly on a
face area of the attachment sheath.
8. An attachment according to claim 1 wherein the attachment sheath
comprises a sheath slot in the axial direction.
9. An attachment according to claim 4, wherein the impingement part
comprises a longitudinal slot in the axial direction.
10. A tool comprising: a hollow drill bit; an accepting shaft; and
a clamping area, wherein the hollow drill bit comprises a face area
at the accepting side, which shows at least one penetrating opening
for the engagement of an ejection element.
11. A tool according to claim 10, wherein the hollow drill bit
comprises a multitude of penetrating openings at the accepting
side, with the penetrating openings being arranged annularly on the
facial area.
12. A system including: a hollow drill bit; an accepting shaft; a
clamping area, wherein the hollow drill bit comprises a face area
at the accepting side, which shows at least one penetrating opening
for the engagement of an ejection element; and an attachment sheath
embodied for fastening at an accepting shaft having at least one
ejection element, which is embodied to engage the hollow volume of
the hollow drill bit and for transferring a force upon the drill
core.
13. The system of claim 12 wherein in that the hollow drill bit
comprises a penetrating hole, which is formed such that an ejection
element may engage a hollow volume of the hollow drill bit in order
to transfer an impacting force upon a drill core.
14. A method for removing a drill core from a hollow drill bit,
said method comprising: arranging an attachment sheath with at
least one ejection element at an accepting shaft so that the
ejection element engages a hollow volume of a hollow drill bit and
contacts a drill core; arranging an impingement part at the
attachment sheath between a distant position and an impact area;
and moving the impingement part between the distant position and
the impact area such that a force of the impingement part is
transferred via the attachment sheath and/or the ejection element
upon the drill core located in the hollow drill bit and thus the
drill core is ejected from the hollow drill bit.
15. A method according to claim 14, wherein the arrangement of at
least one of the attachment sheath and the impingement part occurs
by laterally plugging it on.
16. A method according to claim 14, wherein the arrangement of at
least one of the attachment sheath and the impingement part occurs
by way of plugging on from the rear.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] The present application claims priority to German Patent
Application DE 2011 005 903.2, filed Mar. 22, 2011, and entitled
"Werkzeug zur Bohrkornentfernung aus Hammerbohrkronen" ("Tool for
Removing Drill Cores from Hammer Drill Bits"), which is hereby
incorporated by reference in its entirety.
BACKGROUND OF THE INVENTION
[0002] The present invention generally relates to a device, a tool,
a system, and a method for removing a drill core from a hollow
drill bit, particularly a hammer drill core.
[0003] DD 277 875 A1 discloses a method for removing a drill core
when drilling with core drilling devices. It provides that after
the drilling and the breaking of the drill core a wedge is inserted
into the drill bit, slightly inclined. Then the drill bit is
pressed into the drilling gap and the drill core is clamped tightly
against the interior wall by said wedge. When pulling out the drill
bit the drill core is entrained and subsequently carefully tapped
out of the unscrewed drill bit using a rod.
[0004] DE 10 2008 011 483 A1 shows a drill for hard materials with
a shaft, with a drill bit being arranged at its end. The drill bit
comprises a processing surface, which represents its face area.
There is a hole in the middle of said face, with material being
impressed therein during processing. The opening may penetrate the
entire shaft, so that a drill core may be removed from the drill
from the rear using a tappet, driver, or merely a piece of
wire.
[0005] This type of removal of drill cores may only occur with a
drilling tool being removed from the tool accept of the machine
tool. In order to remove a hard to move or jammed drill core, a
task frequently occurring in practice, in addition to the use of a
driver also the use of an additional impinging tool is required to
impact said driver. Here, the safety of the operator may be
compromised when the impinging tool slips.
[0006] EP 1 356 883 A1 discloses a device for core drills,
particularly in hollow walls for the use of hollow wall cups,
comprising an ejection mechanism supported in a displaceable
fashion, which during the progression of the drill shows an
ejection spring, which may be stressed, in order to independently
eject the drill core. However, it may occur that the spring force
of the ejection spring is insufficient to independently eject the
drill core. This is particularly the case when ejecting drill cores
of high density, such as concrete or granite.
[0007] Thus, it may be possible to improve the process of removal
of drill cores from hollow drill bits according to prior art.
Particularly in case of a drill core jammed in the drill bit the
user relies on a hard material to beat the hollow drill core until
the drill core moves out of the hollow drill bit or, in case of a
rear removal according to prior art, needs to use an impinging tool
with a high risk for slipping off. On the one hand, this may damage
the hollow drill bit, on the other hand it may represent a safety
risk for the user.
BRIEF SUMMARY OF THE INVENTION
[0008] An attachment and method of use for removing a drill core
from a hollow volume of a hollow drill bit is provided. The
attachment comprises an attachment sheath embodied to be arranged
at an accepting shaft comprising at least one ejection element,
which is embodied in the hollow volume of the hollow drill bit and
designed for transferring a force upon the drill core.
BRIEF DESCRIPTION OF THE DRAWINGS
[0009] Additional advantages, features, and details of the
invention are discernible from the following description of the
preferred exemplary embodiments as well as based on the drawing,
which shows in a schematic illustration:
[0010] FIG. 1 is a longitudinal cross-section of an exemplary
embodiment of an attachment according to a preferred
embodiment;
[0011] FIG. 2 is a longitudinal cross-section of an attachment and
a tool in a system according to a preferred embodiment;
[0012] FIG. 3A is a cross-section of a first variant of the
embodiment of an attachment and a tool in a system;
[0013] FIG. 3B is a cross-section of a second variant of the
embodiment of an attachment and a tool in a system; and
[0014] FIG. 4 is a flow chart of a preferred method for removing a
drill core from a hollow drill bit.
DETAILED DESCRIPTION OF THE INVENTION
[0015] One or more of the embodiments of the present invention
provide a device, a tool, a system, and a method by which a drill
core may safely be removed from a hollow drill bit without being
damaged.
[0016] This is attained according to the device by an attachment
for removing a drill core from a hollow drill bit, relating to the
tool according to a further developed tool, regarding the system by
a system comprising a tool and an attachment, and regarding the
method by a method for removing a drill core from the hollow drill
bit.
[0017] One or more of the embodiments of the present invention is
based on the thought that the method of prior art for removing the
drill core may damage the hollow drill bit. In particular, in the
method of prior art comprising a hammer drill bit clamped in the
hammer drill the bearing of the hammer drill may also be damaged.
Furthermore, one or more of the embodiments of the invention is
based on the thought that a manual ejection of the drill core
according to prior art should be unnecessary, to the extent
possible. A device, a tool, a system, and a method for removing a
drill core from a hollow drill bit should be provided with
comparatively high user safety.
[0018] One or more embodiments of the invention has recognized that
providing an attachment for removing a drill core from a hollow
drill bit may allow a secure removal of a drill core from the
hollow drill bit. For this purpose, the attachment comprises an
attachment sheath to be arranged at an accepting shaft with at
least one ejection element, which is embodied to engage the hollow
volume of the hollow drill bit and for transferring a force upon
the drill core. This way, a drill core may safely be removed from a
hollow drill bit without damaging said drill bit. One or more
embodiments of invention has further recognized that these
advantages may be achieved with a tool according to the invention.
The tool comprises: a hollow drill bit, an accepting shaft, and a
clamping section, with the hollow drill bit comprising a face at
the accepting side, which shows at least one opening for the
engagement of an ejection element.
[0019] One or more embodiments of invention has further recognized
that a method for removing the drill core from a hollow drill bit
particularly designed for the use of an attachment and the tool
according to the invention comprises the steps:
[0020] Arranging an attachment sheath with at least one ejection
element at an accepting shaft such that the ejection element
engages a hollow volume of the hollow drill bit and contacts the
drill core,
[0021] Arranging an impinging part at the accepting shaft between a
distant position and a contact area,
[0022] Moving the impingement part between a distant position and
the contact area such that a force is transferred by the
impingement part via the attachment sheath and/or the ejection
element upon the drill core located in the hollow drill bit, and
this way the drill core is ejected from the hollow drill bit.
[0023] This way, a drill core may safely be removed from a hollow
drill bit, avoiding damage to the hollow drill bit and risks for
the user.
[0024] In the method according to one or more embodiments of the
invention the removal of a drill core from a hollow drill bit may
occur on the one hand by a rear attachment of the attachment sheath
and/or the impingement part, or also via a lateral attachment of
the attachment sheath and/or the impingement part. The lateral
attachment is thereby advantageous for a rapid removal of the drill
core. The rear attachment allows a higher precision of guidance,
and is thus suitable for the use of removing drill cores of smaller
dimensions.
[0025] Within the scope of a preferred constructive further
development the attachment sheath is embodied as a centering
sheath. This is advantageous in that the ejecting element embodied
to engage the hollow volume of the hollow drill bit and for
transferring the effects of a force upon the drill core may always
be brought into a position defined for engagement. Further
developing this concept the ejection element may be embodied as an
ejection pin.
[0026] Beneficially the attachment further comprises an impingement
part for arranging and for guided movements between a distant
position and an impingement area. In a first constructive further
development the impingement part is embodied for transferring the
impacting force upon the attachment sheath.
[0027] In an alternative constructive further development the
impingement part is additionally or alternatively embodied to
transfer an impacting force directly upon the ejection element. By
the advantageous provision of an impingement part here higher
forces may be yielded for ejecting the drill core from the hollow
drill bit.
[0028] The ejection element may be connected to the attachment
sheath in a form-fitting or force-fitting manner, or by
substance-to-substance bonding. In this case, the force is first
applied by the impingement part upon the attachment sheath and then
via the ejection element upon the drill core.
[0029] The impingement part may also be embodied such that the
impacting force is directly transferred to the ejection element. In
this case, the attachment sheath serves as a guiding element for
the ejection element or elements. The advantages of this embodiment
comprise that in case of particularly hard drill cores and a
perhaps accordingly high wear and tear of the ejection elements
they may be exchanged relatively easily.
[0030] Within the scope of another particularly preferred
constructive further development the attachment comprises a
multitude of ejection elements, which are arranged in an annular
fashion in the face of the attachment sheath. This is advantageous
in that a force to be applied at several points may be transmitted
via the ejection elements upon the drill core. The drill core may
therefore be removed from the hollow drill bit in an even fashion
and without canting. Accordingly, in a further constructive
development the tool may comprise a hollow drill bit, comprising a
multitude of penetrating openings at the side of the accept, with
the penetrating openings being arranged annularly over the face
area. The tool is therefore beneficially equipped together with an
attachment for the use to remove a drill core.
[0031] Beneficially, the attachment sheath of the attachment
comprises a slot in the sheath in the axial direction.
Additionally, the impingement part may show a longitudinal slot in
the axial direction. This constructive further development is
advantageous such that the attachment sheath and/or the impingement
part may be installed quickly and reliably even when the hollow
drill bit is fastened in the hammer drill. This represents time
savings in high drilling volumes.
[0032] In the following, exemplary embodiments of the invention are
described in greater detail using the drawing. Said drawing shall
not necessarily show the exemplary embodiments to scale, rather the
drawing is schematic in order to serve explanatory purposes and/or
shown in a slightly distorted form. With regards to the
complementary teaching directly discernible from the drawing
reference is made to the applicable prior art. Here, it must be
considered that a multitude of modifications and alterations may be
performed with regards to shape and detail of the embodiment,
without deviating from the general idea of the invention. The
features of the invention disclosed in the description, the
drawing, and the claims may be used individually as well as in any
arbitrary combination essential for a further development of the
invention. Additionally, the scope of the invention includes any
and all combinations of features disclosed in the description, the
drawing, and/or the claims. The general idea of the invention is
not limited to the precise form or the detail of the preferred
exemplary embodiment shown and described in the following or
restricted to an object which would be limited compared to the
objectives disclosed in the claims. With regards to the measurement
ranges stated, here too values within the limits mentioned as
limits shall be considered disclosed and arbitrarily applicable and
clamped. For reasons of simplification, in the following identical
or similar parts or parts with an identical or similar function are
marked with the same reference characters.
[0033] FIG. 1 shows an attachment 10 in a longitudinal
cross-section according to a preferred embodiment. Here, the
attachment 10 comprises an attachment sheath 11, an impingement
part 13, and two ejection elements 12. Here, the attachment sheath
11 comprises a planar face area 14 of the sheath and a planar
impingement surface 21. The two ejection elements 12 are here
arranged on the face area 14 of the attachment sheath 11 and/or
inserted therein via drive fit. The impingement part 13 is arranged
in the axial direction in reference to the attachment sheath 10
between a distant position 23 and an impingement area 21. In the
sense of the method for removing a drill core from a hollow drill
bit the impingement part 13 may be guided in a distant position 23
and the impingement area 21. When the impingement part 13 hits the
impact area 21, a force is transferred from the impingement part to
the attachment sheath 11, in order to be transferred via the
ejection elements 12 upon the drill core, not shown. By a repeated
movement of the impingement part 13 between the distant position 23
and the impact area 21 subsequently an intermittent force is
applied upon the drill core.
[0034] FIG. 2 shows a system 100 comprising the attachment of FIG.
1 and a tool 80. The tool 80 comprises here a hollow drill bit 70
with an accepting shaft 72 and a clamping area 76. A drill core 90
is present in the hollow volume 71 of the hollow drill bit 70. The
hollow drill bit 70 comprises here a face area 18 at the accepting
side and two penetrating openings 75 at the accepting side, which
are embodied as penetrating bores. The attachment sheath 11 is
arranged at the accepting shaft 72 such that the two ejection
elements 12 penetrate through the penetrating openings 75 embodied
in as penetrating bores and contact the drill core 90. The fittings
between the penetrating openings 75 and the ejecting element 12
shows play, here. As already discernible from FIG. 1, the
impingement part 13 is arranged between a distant position 23 and
an impact area 21 on the attachment sheath 11. The accepting shaft
72 comprises a clamping area 76 for mounting in a hammer drill.
[0035] FIGS. 3A and 3B show a cross-section A-A, with its
progression being illustrated in FIG. 2. FIG. 3B shows here an
embodiment shown as a variant of FIG. 2, thus here the progression
A-A of the cross-section shown in FIG. 2 shall only be considered
an example. In the embodiment of a system 100 shown in FIG. 3A the
attachment sheath 11 and the impingement part 13 are free from
slots. According to the method, here the attachment sheath 11 and
the impingement part 13 are arranged by being plugged on from the
rear. As discernible from the cross-sectional illustration the
attachment sheath 11 completely covers the accepting shaft 72 here,
and itself in turn is completely covered by the impingement part
13. The fittings between the attachment sheath 11 and the accepting
shaft 72 and/or the attachment sheath 11 and an impingement part 13
are here fittings with play. FIG. 3B shows a cross-section of
another embodiment, namely a system 100'. The attachment sheaths 11
here comprises one sheath slot 15 each in the axial direction in
reference to the attachment sheath 11. The two impingement parts 13
each show a longitudinal slot 17 in the axial direction of the
impingement part 13. FIG. 3B shows here in the view (i) the
alignment of the attachment sheath 11 and the impingement part 13
immediately after their lateral fastening on the accepting shaft 72
by way of being plugged on. In the view (ii) for the
above-described embodiment, FIG. 3B shows an arrangement with an
impingement part 13 distorted about the longitudinal axis. The
impingement part 13 is here arranged such that the sheath slot 15
located in the attachment sheath 11 is essentially covered by the
wall of the impingement part 13. This way it may be effectively
prevented at least that the attachment sheath laterally falls off
during the operation of the attachment.
[0036] In a flow chart FIG. 4 illustrates a method for removing a
drill core from a hollow drill bit. In the cross-section 201 here
first an ejection element 12 comprising an attachment sheath 11 is
arranged at an accepting shaft 72 of a tool 80 also comprising a
hollow drill bit 70 and a clamping section 76, fastened by way of
laterally being plugged on. In the appropriate position the
ejection element 12 engages a hollow volume 71 of the hollow drill
bit 70 and contacts the drill core 90. In step 202 an impingement
part 13 is plugged laterally upon the attachment sheath 11 between
a distant position 23 and an impact area 21. In step 203 the
impingement part 13 between the distant position 23 and the impact
area 21 is moved such that a force is first applied by the
impingement part 13 upon the attachment sheath 11 and then by the
attachment sheath 11 via the ejection element 12 transferred upon
the drill core 90 located in the hollow drill bit 70, thus ejecting
the drill core from the hollow drill bit 70. The step 203, moving
the impingement part 13 between the distant position 23 and the
impact area 21, is performed at least one, usually several
times.
[0037] While particular elements, embodiments, and applications of
the present invention have been shown and described, it is
understood that the invention is not limited thereto because
modifications may be made by those skilled in the art, particularly
in light of the foregoing teaching. It is therefore contemplated by
the appended claims to cover such modifications and incorporate
those features which come within the spirit and scope of the
invention.
* * * * *