EP2669060B1 - Machine-outil à main de burinage - Google Patents
Machine-outil à main de burinage Download PDFInfo
- Publication number
- EP2669060B1 EP2669060B1 EP13168470.6A EP13168470A EP2669060B1 EP 2669060 B1 EP2669060 B1 EP 2669060B1 EP 13168470 A EP13168470 A EP 13168470A EP 2669060 B1 EP2669060 B1 EP 2669060B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- grooves
- hand
- guide tube
- power tool
- held power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000002184 metal Substances 0.000 claims description 11
- 230000007423 decrease Effects 0.000 claims description 2
- 238000007373 indentation Methods 0.000 claims description 2
- 229910003460 diamond Inorganic materials 0.000 claims 1
- 239000010432 diamond Substances 0.000 claims 1
- 238000009527 percussion Methods 0.000 description 10
- 238000007789 sealing Methods 0.000 description 4
- 238000009423 ventilation Methods 0.000 description 4
- 230000001050 lubricating effect Effects 0.000 description 3
- 238000010009 beating Methods 0.000 description 2
- 238000004049 embossing Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229920003052 natural elastomer Polymers 0.000 description 1
- 229920001194 natural rubber Polymers 0.000 description 1
- 244000052769 pathogen Species 0.000 description 1
- 230000001717 pathogenic effect Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
- 230000000930 thermomechanical effect Effects 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D11/00—Portable percussive tools with electromotor or other motor drive
- B25D11/06—Means for driving the impulse member
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D17/00—Details of, or accessories for, portable power-driven percussive tools
- B25D17/06—Hammer pistons; Anvils ; Guide-sleeves for pistons
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
- B25D2217/0011—Details of anvils, guide-sleeves or pistons
- B25D2217/0019—Guide-sleeves
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
- B25D2250/065—Details regarding assembling of the tool
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
- B25D2250/185—Pressure equalising means between sealed chambers
Definitions
- the present invention relates to a chiseling, eg a chiselling or turning chisel hand tool machine with a pneumatic impact mechanism, such as FR 1485579 A and the preamble of claim 1.
- a powered pneumatic percussion mechanism percussion piston in a guide tube is periodically accelerated by an air spring and impacts a tool or intermediate impactor at a point of impact.
- the principle of the air spring requires an airtight guidance of the percussion piston in the guide tube. Due to the high mechanical load caused by the setbacks or the thermomechanical loads, the hammer mechanism should not heat up to over 100 degrees Celsius. Furthermore, the percussion piston must move smoothly in the guide tube in order not to suppress the relatively weak coupling of the motor drive via the air spring.
- the hand tool of the invention which is defined by the features of claim 1, has a pneumatic percussion.
- the percussion includes a motor-driven exciter, a guide tube and a racket.
- a formed inside the guide tube between the exciter and the bat air spring is circumferentially pressure sealed off from an inner surface of the guide tube.
- the exciter and / or the club are formed as a piston guided by the inner surface.
- exciters and clubs as a piston the exciter as a piston and the racket rigidly connected to the guide tube cup-shaped, or the racket as a piston and the exciter can be rigidly connected to the guide tube.
- An inner surface of the guide tube is provided with a plurality of molded-in recesses.
- the inner surface is adapted in shape to the outer contour of the piston, so that it is clean and sealed pressure-tight. A slight deviation through depressions proves to be advantageous in terms of friction, without affecting the guide and in particular the pressure-tight closure essential for the concept of the pneumatic impact mechanism.
- the depressions have a depth between 10 .mu.m and 100 .mu.m. Smaller depressions show no influence, it is assumed that the lubricating film compensates for these depressions. Larger depressions increased the abrasion of the sealing elements and thus reduced the life.
- a dimension of the recess parallel to the working axis is preferably less than 200 ⁇ m.
- the depressions have an area fraction between 1% and 10% of the inner surface.
- An inner surface of the guide tube may be provided with a plurality of grooves running obliquely to the working axis and / or circular, square or diamond-shaped dents.
- the grooves have a length at least an order of magnitude greater than width.
- the dents are about the same length as they are wide.
- An inner surface of the guide tube is provided with a plurality of grooves extending obliquely to the working axis.
- the oblique grooves reduce the frictional force without, as initially feared, worsening a seal of the pneumatic chamber for the air spring significantly.
- the efficiency of the hammer mechanism could be increased, i. the ratio of the impact energy delivered by the racket to the tool to the energy supplied by the motor via the exciter could be increased.
- An embodiment provides that the grooves cross each other diamond-shaped.
- One group of grooves has a different direction of rotation about the working axis than the grooves of another group.
- An angle of inclination of the grooves with respect to the working axis is preferably in the range between 30 degrees and 50 degrees. This is especially true when the inclination of the grooves is constant over their entire length. In one embodiment, it is provided that the angle of inclination decreases along a direction of impact. The inclination angle is in the range of the impact point at 20 degrees to 40 degrees.
- the grooves advantageously extend over at least the track swept by the racquet during the beating operation.
- One embodiment provides that grooves of a group with a common direction of rotation run parallel to one another.
- the guide tube is bent from a sheet metal strip.
- Sheet metal strips are produced by rolling. This will make the surface typically very smooth and even.
- An embossing or scribing of the grooves proves to be particularly advantageous for shaped sheet metal guide tubes.
- the sheet metal strip may be connected at its two opposite edges by a continuous positive connection or a seam to form a pressure-tight tube. The pressure-tight fit is ensured by a toothing.
- Fig. 1 schematically shows a hammer drill 1 as an example of a chiseling hand tool .
- the hammer drill 1 has a tool holder 2, in which a shank end 3 of a tool 4, for example one of the drill bit can be used.
- a primary drive of the hammer drill 1 is a motor 5, which drives a striking mechanism 6 and an output shaft 7 .
- a user can guide the hammer drill 1 by means of a handle 8 and take means of a system switch 9, the hammer drill 1 is in operation.
- the hammer drill 1 rotates the drill bit 4 continuously about a working axis 10 and can beat the drill bit 4 in the direction of impact 11 along the working axis 10 in a substrate.
- the percussion 6 is, for example, a pneumatic percussion 6.
- a pathogen 12 and a racket 13 are guided in the percussion 6 along the working axis 10 movable.
- the exciter 12 is coupled via an eccentric 14 or a wobble finger to the motor 5 and forced to a periodic, linear movement.
- An air spring formed by a pneumatic chamber 15 between exciter 12 and racket 13 couples a movement of the racket 13 to the movement of the exciter 12 at.
- the racket 13 can strike directly on a rear end of the drill bit 4 or indirectly transfer part of its pulse to the drill bit 4 via a substantially resting intermediate racket 16 .
- the striking mechanism 6 and preferably the further drive components are arranged within a machine housing 17 .
- the exemplary exciter 12 is designed as a piston which is moved back and forth in a cylindrical guide tube 18 .
- the racket 13 is also designed as a piston. Both the exciter 12 and the racket 13 close with their radial outer surfaces airtight with an inner surface 19 of the guide tube 18 from.
- the racket 13 is provided with a sealing ring 20 , which typically proves necessary to achieve a pressure in the range between 10 bar and 20 bar due to remaining manufacturing tolerances.
- the sealing ring 20 is preferably made of natural or synthetic rubber.
- the exciter 12 may be rigidly connected to the guide tube 18 to form a pot-shaped exciter 12 in which the racket 13 is running.
- the guide tube 18 may extend to a bearing block 21 for the intermediate beater 16 .
- the guide tube 18 has a plurality of radial to the working axis 10 openings.
- First of the openings 22 allow an adiabatic pressure equalization of the air spring in a warming device.
- Second of the openings 23 aerate the pneumatic chamber 15 and deactivate the air spring as soon as the striking mechanism 6 beats empty.
- the friction losses of the exciter 12 on the inner surface 19 of the guide tube 18 should be as minimal as possible.
- a first reduction in friction is achieved by a lubricating film.
- a structured inner surface 19 also proves to be advantageous over a smooth inner surface 19.
- the inner surface 19 is provided with obliquely to the working axis 10 extending grooves 24 .
- Fig. 3 shows the unrolled inner surface 19 of the guide tube 18th
- the grooves 24 have a depth 25 of more than 10 microns (microns) and a depth 25 of less than 100 microns.
- a width 26 of the grooves 24 is in the region of the depth 25th
- the grooves 24 are about one to five times as wide as they are deep.
- the depth 25 is the dimension of the groove 24 in the radial direction, the width 26 the smallest dimension of the groove 24 on the inner surface 19 and the length is the largest dimension on the inner surface 19.
- the grooves 24 may extend over the entire length 27 of the guide tube 18 extend.
- the grooves 24 extend helically along the inner surface 19. An inclination of the grooves 24 relative to the working axis 10 remains preferably constant over the length thereof.
- a first group 28 of the grooves 24 extends in a positive direction of rotation and a second group 29 of the grooves 24 extends in a negative direction of rotation.
- the grooves 24 of the two groups 28, 29 intersect alternately.
- Adjacent grooves 24, a group 28, 29 are arranged offset to one another at a distance between 5 000 .mu.m to 20 000 .mu.m along the working axis 10 .
- the inner surface 19 between the adjacent grooves 24 is preferably smooth. Smooth means that a roughness of the inner surface 19 between the grooves 24 is at least an order of magnitude smaller than the depth 25 of the grooves 24th
- An amount of the inclination angle 30 of the grooves 24 with respect to the working axis 10 is in the range between 30 degrees and 50 degrees.
- the relationship of the inclination in the interplay with the racket 13, the sealing ring 20, the lubricating film and the periodically changing temperature and pressure conditions is not fully understood. Tilt angles 30 out of range, both smaller and larger, however, result in greater losses of percussion 6.
- the angle of inclination 30 of the helical grooves 24 is the difference from the pitch angle to 90 degrees.
- the guide tube 18 is made of a bent sheet metal strip 31 , which is closed by a seam and / or a toothed closure along the working axis 10 ( Fig. 3 ).
- the opposite edges 32 of the sheet-metal strip 31 may be provided with a toothing, which engage in the bent to the guide tube 18 sheet metal strip 31 .
- the toothing 33 may additionally be hermetically sealed by a weld. Alternatively, the teeth may be hermetically sealed with a plastic.
- the grooves 24 are preferably rolled in the sheet metal strip 31 or introduced by another non-cutting method.
- the inner surface 19 thus remains free of burrs.
- the guide tube 18 longer than the track 34 of the racket 13 during operation.
- the racket 13 periodically moves between a beating point and a rear turning point.
- the impact point is defined by the intermediate beater 16 and its end facing the racket 13 .
- the rear reversal point results from the air spring 15, which decelerates the racket 13 to a stop and then accelerates in the direction of the impact point.
- the rear reversal point is approximately at the level at which the exciter 12 has covered halfway between its two turning points.
- a first vent 22 for adiabatic pressure equalization is preferably stamped in the sheet metal strip 31 . Further, preferably second ventilation opening 23 are punched for stopping the striking mechanism 6 in the sheet metal strip 31 .
- the puncture indentation is on the inner surface 19.
- the ventilation openings 22, 23 are located outside of the track 34.
- the second ventilation openings 23 preferably directly adjoin the track 34 .
- the grooves 24 terminate in one embodiment in the vicinity of the second ventilation openings 23, that is, on a subsequent to the track 34 in the direction of impact 11 section of the guide tube 18. Increased friction may favor stopping of the racket 13 when the racket 13, for example at a Space over the impact point slides out.
- a further embodiment provides for a variation of the angle of inclination 30 along the working axis 10 .
- the inclination angle 30 relative to the working axis 10 increases in the direction of impact 11 .
- the guide tube 18 must be tight against the high air pressure in the pneumatic chamber 15 .
- vertical grooves 24 are preferred.
- this orientation of the grooves 24 produce well a larger frictional resistance than with the working axis 10 parallel grooves 24.
- the inclination angle 30 is located in the area of the rear reversal point between 40 degrees and 60 degrees and increases in the direction to the impact point on from between 20 degrees and 30 degrees ,
- An embodiment may have different depth grooves 24 .
- every fifth to tenth groove 24 may have a depth 25 to five times as great as the others.
- the few and deeper grooves 24 with, for example, a depth 25 between 50 microns and 100 microns can pick up dust grains that pass through the seals and the intermediate beater 16 .
- the number of deep grooves 24 is kept small in order to ensure a sufficiently pressure-tight closure of the racket 13 on the inner surface 19 .
- the dents 35 have a depth 25 between 10 microns and 100 microns.
- a diameter 36 of the dimples 35 lies approximately in the region of their depth 25.
- the dimples 35 are preferably arranged regularly, for example at nodal points of a grid with rectangular or diamond-shaped cells.
- the entire surface of the dimples 35 is significantly smaller than the inner surface 19, according to the invention between 1% and 10% of the inner surface (19).
- the remaining inner surface 19 is preferably smooth, ie has a roughness of significantly less than 10 microns.
- the racket 13 touches the remaining smooth inner surface 19th
- the dents 35 can be embossed, for example, with a stamp in the inner surface 19 .
- the Aufsch embossing can be leveled by a subsequent rolling or stamping.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Percussive Tools And Related Accessories (AREA)
- Surgical Instruments (AREA)
Claims (10)
- Machine-outil manuelle comportant un mécanisme de percussion pneumatique (6) incluant un excitateur (12) entraîné par moteur, un tube de guidage (18) et un percuteur (13), dans laquelle un ressort pneumatique (15) formé à l'intérieur du tube de guidage (18) entre l'excitateur (12) et le percuteur (13) est obturé de manière circonférentielle et étanche à la pression par une surface intérieure (19) du tube de guidage (18), et au moins l'un de l'excitateur (12) et du percuteur (13) est mis en oeuvre sous la forme d'un piston guidé par la surface intérieure (19), dans laquelle une surface intérieure (19) du tube de guidage (18) est munie d'une pluralité d'évidements moulés (24, 35), caractérisée en ce que les évidements (24, 35) présentent une profondeur (25) comprise entre 10 µm et 100 µm et occupent une aire de surface comprise entre 1 % et 10 % de la surface intérieure (19).
- Machine-outil manuelle selon la revendication 1, caractérisée en ce qu'une dimension de l'évidement (24, 35) parallèle à l'axe de travail (10) est inférieure à 200 µm.
- Machine-outil manuelle selon les revendications 1 ou 2, caractérisée en ce que les évidements contiennent des bossages (35) dont la longueur et la largeur respectives sont sensiblement égales.
- Machine-outil manuelle selon l'une des revendications précédentes, caractérisée en ce que la surface intérieure (19) du tube de guidage (18) est munie de plusieurs rainures (24) s'étendant en oblique par rapport à l'axe de travail (10).
- Machine-outil manuelle selon la revendication 4, caractérisée en ce que les rainures (24) se croisent mutuellement en formant des losanges.
- Machine-outil manuelle selon la revendication 4 ou 5, caractérisée en ce que les rainures (24) s'étendent sur au moins un trajet (34) couvert par le percuteur (13) dans le mode de percussion.
- Machine-outil manuelle selon l'une des revendications 4 à 6, caractérisée en ce qu'un angle d'inclinaison (30) des rainures (24) par rapport à l'axe de travail (10) est compris entre 30 degrés et 50 degrés.
- Machine-outil manuelle selon l'une des revendications 4 à 7, caractérisée en ce qu'un angle d'inclinaison (30) des rainures (24) diminue le long d'une direction de percussion (11), dans laquelle un angle d'inclinaison (30) est compris entre 20 degrés et 40 degrés dans la zone du point d'impact.
- Machine-outil manuelle selon l'une des revendications précédentes, caractérisée en ce que le tube de guidage (18) est plié à partir d'une bande de tôle (31).
- Machine-outil manuelle selon la revendication 9, caractérisée en ce que deux bords opposés (32) sont reliés de manière continue par emboîtement de formes.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102012208986A DE102012208986A1 (de) | 2012-05-29 | 2012-05-29 | Meißelnde Werkzeugmaschine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2669060A1 EP2669060A1 (fr) | 2013-12-04 |
EP2669060B1 true EP2669060B1 (fr) | 2017-02-22 |
Family
ID=48444231
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13168470.6A Active EP2669060B1 (fr) | 2012-05-29 | 2013-05-21 | Machine-outil à main de burinage |
Country Status (4)
Country | Link |
---|---|
US (1) | US9527199B2 (fr) |
EP (1) | EP2669060B1 (fr) |
CN (1) | CN103447580B (fr) |
DE (1) | DE102012208986A1 (fr) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN106903804A (zh) * | 2017-03-23 | 2017-06-30 | 恒运市政园林建设有限公司 | 一种用于建筑装潢的钻孔装置 |
CN106903805A (zh) * | 2017-03-23 | 2017-06-30 | 恒运市政园林建设有限公司 | 一种装修用打孔器 |
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DE102011007660A1 (de) * | 2011-04-19 | 2012-10-25 | Hilti Aktiengesellschaft | Handwerkzeugmaschine und Herstellungsverfahren |
US20150136826A1 (en) * | 2012-05-29 | 2015-05-21 | Hilti Aktiengesellschaft | Combustion driven fastener setting device |
EP2842696B1 (fr) * | 2013-08-30 | 2016-06-01 | HILTI Aktiengesellschaft | Outil électrique |
EP2857150A1 (fr) * | 2013-10-03 | 2015-04-08 | HILTI Aktiengesellschaft | Machine-outil manuelle |
GB201321894D0 (en) * | 2013-12-11 | 2014-01-22 | Black & Decker Inc | Hammer drive mechanism |
US20150343616A1 (en) * | 2014-06-03 | 2015-12-03 | Soartec Industrial Corp. | Hammering set for an impact tool |
JP6325360B2 (ja) * | 2014-06-12 | 2018-05-16 | 株式会社マキタ | 打撃工具 |
EP3281747A1 (fr) | 2016-08-09 | 2018-02-14 | HILTI Aktiengesellschaft | Machine-outil portative |
CN112770873B (zh) * | 2018-09-20 | 2023-09-22 | 博世电动工具(中国)有限公司 | 冲击式工具机 |
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DE102009026542A1 (de) * | 2009-05-28 | 2010-12-09 | Hilti Aktiengesellschaft | Werkzeugmaschine |
DE102009027469A1 (de) * | 2009-07-06 | 2011-01-13 | Robert Bosch Gmbh | Werkzeugvorrichtung |
ITMI20092058A1 (it) * | 2009-11-23 | 2011-05-24 | Aquila Luca Dell | Dispositivo motore, particolarmente per macchine da tatuaggio, dermografia e simili. |
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DE102010029915A1 (de) * | 2010-06-10 | 2011-12-15 | Hilti Aktiengesellschaft | Werkzeugmaschine und Steuerungsverfahren |
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DE102011007660A1 (de) * | 2011-04-19 | 2012-10-25 | Hilti Aktiengesellschaft | Handwerkzeugmaschine und Herstellungsverfahren |
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- 2013-05-22 CN CN201310191376.0A patent/CN103447580B/zh active Active
- 2013-05-22 US US13/900,405 patent/US9527199B2/en active Active
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106903804A (zh) * | 2017-03-23 | 2017-06-30 | 恒运市政园林建设有限公司 | 一种用于建筑装潢的钻孔装置 |
CN106903805A (zh) * | 2017-03-23 | 2017-06-30 | 恒运市政园林建设有限公司 | 一种装修用打孔器 |
CN106903804B (zh) * | 2017-03-23 | 2018-12-04 | 灵武市伟畅机械科技有限公司 | 一种用于建筑装潢的钻孔装置 |
CN106903805B (zh) * | 2017-03-23 | 2018-12-04 | 宁夏百畅万通矿山机械有限公司 | 一种装修用打孔器 |
Also Published As
Publication number | Publication date |
---|---|
US20130319712A1 (en) | 2013-12-05 |
US9527199B2 (en) | 2016-12-27 |
CN103447580A (zh) | 2013-12-18 |
EP2669060A1 (fr) | 2013-12-04 |
DE102012208986A1 (de) | 2013-12-05 |
CN103447580B (zh) | 2017-04-12 |
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