EP3117958A1 - Meuleuse portative - Google Patents

Meuleuse portative Download PDF

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Publication number
EP3117958A1
EP3117958A1 EP16176640.7A EP16176640A EP3117958A1 EP 3117958 A1 EP3117958 A1 EP 3117958A1 EP 16176640 A EP16176640 A EP 16176640A EP 3117958 A1 EP3117958 A1 EP 3117958A1
Authority
EP
European Patent Office
Prior art keywords
spindle
housing part
hand grinder
transmission
housing
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.)
Granted
Application number
EP16176640.7A
Other languages
German (de)
English (en)
Other versions
EP3117958B1 (fr
Inventor
Hans-Peter Sebald
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sebald Schleifmittel & Co KG GmbH
Original Assignee
Sebald Schleifmittel & Co KG GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sebald Schleifmittel & Co KG GmbH filed Critical Sebald Schleifmittel & Co KG GmbH
Publication of EP3117958A1 publication Critical patent/EP3117958A1/fr
Application granted granted Critical
Publication of EP3117958B1 publication Critical patent/EP3117958B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
    • B24B23/028—Angle tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • B24B55/02—Equipment for cooling the grinding surfaces, e.g. devices for feeding coolant
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/008—Cooling means

Definitions

  • a hand grinder with at least one electric drive and a drive shaft which is coupled with a rotatably mounted spindle arranged orthogonal to the drive shaft via a gear arrangement, a housing part for the transmission and a housing part connected thereto for at least a part of the spindle described.
  • Such hand grinders are also known from the prior art as angle grinders or polishing machines.
  • a hand grinder is described herein having a port for a fluid which fluid is applied to the surface to be processed during operation of the hand grinder.
  • a drive for these hand grinders for example, single-phase motors are used, which transmit the rotary motion to a perpendicular to the drive shaft rotatably mounted spindle via a gearbox.
  • the spindle has at its lower end a threaded portion over which various machining tools, such as grinding wheels, can be attached.
  • a handle on the front housing part of the hand grinder preferably in the region of the transmission housing, on.
  • the fluid supply to the surface to be machined or to a grinding wheel can be done in various ways.
  • Hand grinders with a supply arrangement for the fluid at an upper side of the transmission housing are known from the prior art.
  • a connecting piece and a fluid hose protrude from the top, so that it is difficult or no pressure from above the housing can be applied to the hand grinder. This is particularly disadvantageous because in this area the spindle is arranged.
  • hand grinders are known which allow lateral supply of the fluid via feed nozzles, which are arranged on a housing part of the hand grinder. The fluid is then applied, for example, to the surface of a grinding wheel, which faces away from the tool surface to be machined.
  • DE 20 2004 008 100 U1 discloses an injection polisher in which a fluid conduit with fluid flow control valve is replaced by an on / off valve operable by the thumb of the hand holding the still handle of the injection polisher.
  • the liquid is passed centrally through the spindle, wherein the supply also takes place via the top of the gear housing.
  • the transmission housing has a rigid supply line, which leads away from the transmission housing outside of the injection polisher.
  • hand grinding machines which have a connection for a fluid line on a lower housing part for the spindle.
  • the fluid is transferred via this connection directly to the spindle, which has incorporated into the spindle surface area channels. About these channels can the fluid flow down and is introduced to the surface to be machined.
  • the housing parts for the drive have ventilation openings in order to cool the drive and prevent overheating.
  • the heat development in the region of the transmission is problematic, whereby the housing part for the transmission can have no ventilation openings, since otherwise dust or fluid mist penetrates into the machine and can destroy it.
  • DE 10 39 878 A discloses a stone grinder with water connection for wet grinding, wherein a helical cooling coil is provided for cooling the motor. Water flows through the cooling coil for wet grinding. In addition, the motor is cooled by a fan, wherein the heated air is cooled by the guided in the cooling coil water.
  • DE 603 05 539 T2 discloses a gearbox for angle grinder.
  • the transmission housing may be connected via corresponding openings with the housing of an engine, so that via a motor fan air is guided into the transmission housing and led out through openings in the transmission housing from the transmission housing.
  • US 2,238,096 discloses an angle grinder with a water supply in the transmission housing from above or laterally.
  • the arrangement of the first connection for the Fluidzu slaughter yields that no means are arranged on the housing part for the transmission, which complicate the handling of the hand grinder.
  • the hand grinder described herein it is possible for a user to apply pressure to the top of the housing portion for the transmission or to sidewalls of the housing portion for the transmission.
  • the guidance of the fluid conduit through the transmission housing and through the housing for the spindle ensures that the transmission is cooled. In this case, the fluid flows through the housing part for the transmission and the housing part for the spindle before it exits via the outlet opening. This allows the hand grinder to be cooled without it additional facilities for cooling the transmission must be provided.
  • the arrangement of the at least one outlet opening can be provided so that, for example, the fluid can escape onto the tool surface to be machined over the spindle or through certain channels or outlet openings of the spindle and a correspondingly shaped grinding wheel over the surface of the grinding wheel. Additionally or alternatively, other outlet openings may be provided, which allow a fluid supply to the surface of the grinding wheel.
  • the line can be deflected several times in the housing part for the transmission and / or in the housing part for the spindle.
  • the line may, for example, spiral, in the form of a helix, wavy, zigzag or even in substantially orthogonal patterns through the housing part for the transmission and the housing part for the spindle run.
  • the line can run several times around the gear and / or the spindle around. The larger the area through the conduit surrounding the transmission and / or the spindle, the greater the cooling of the transmission and / or the spindle.
  • the cooling also causes cooling of storage facilities.
  • lubricants can be cooled, which are then also not heated too much.
  • the conduit section may be a hollow shaft extending through the spindle and having at least one outlet opening at its lower end.
  • the hollow shaft is not rotatable and therefore can be connected directly to the line.
  • the spindle is rotatably mounted around the hollow shaft.
  • the hollow shaft has the at least one outlet opening.
  • the hollow shaft may also have further openings, which open into corresponding openings in the spindle, so that a fluid outlet can be achieved via the spindle and corresponding channels in the spindle.
  • the conduit section may be a channel extending through the spindle, the channel being connected at the head end of the spindle via a sealing arrangement on the conduit and the spindle having at its lower end at least one outlet opening connected to the channel.
  • a seal arrangement is required, which is arranged in the connection area between the conduit and the channel.
  • the seal assembly may, for example, have a sliding seal.
  • mechanical seals provide a secure seal over a long period of use.
  • the line may be arranged in or on the housing part for the transmission and / or in the housing part for the spindle.
  • the two housing parts which may also be formed as a common housing part in all embodiments of the hand grinder described herein, incorporated channels.
  • the channels serve as a conduit for the fluid and in particular run around the transmission. In such embodiments can be dispensed with separate line parts or the number and length of the required line parts can be significantly reduced.
  • the formation of the channels in the housing parts can take place during an injection molding process for the production of usually made of plastic housing parts. This also reduces the production costs and the costs for the hand grinder.
  • the first connection can also be formed in an injection molding process on the housing part for the spindle, which then opens into the corresponding channels.
  • a hose or other tubular part may be provided.
  • the housing part for the transmission has a further connection which protrudes into the interior of the housing part for the transmission and is provided for example with a mechanical seal. On this mechanical seal can then be placed in the manufacture of the hand grinder, the head of the spindle, so that without a hose or other means, a fluid connection between the channel and the spindle is made.
  • the hollow shaft can also be arranged from the connection on the inside of the housing part for the transmission.
  • sealing means are arranged on the first connection to the housing part for the spindle so that the fluid supply line can be sealingly connected to the first connection.
  • the formation of the conduit for the fluid through passages in the housing parts provides cooling of the transmission and the spindle without additional components and without an increased weight.
  • the hand grinder may further include a controller and a valve assembly coupled to the controller, wherein the valve assembly regulates the supply of fluid into the conduit and / or into the conduit portion.
  • the hand grinder has a second connection on a holding region facing away from the spindle the hand grinder, wherein the fluid supply line is disposed on a bottom of the hand grinder and connected to the first port and the second port.
  • the second connection may be designed as a connection element for an external fluid connection and the hand grinder may have a second valve arrangement which regulates the fluid supply in accordance with the control unit and / or an actuating element.
  • Electrically powered hand grinders generally also have a switch for switching the hand grinder on / off.
  • the second valve arrangement may be coupled to the on-off switch, so that a fluid supply via the second valve arrangement is automatically provided by switching on the hand grinder.
  • the fluid used may preferably be water, which is used primarily in the treatment of stone surfaces.
  • sufficient cooling of the transmission and / or spindle is possible via the water.
  • no cooling liquids have to be circulated and provided in the manual grinding machine, the discharge of which must be prevented due to environmental or safety regulations.
  • the spindle also has at its lower end a threaded portion, are connected via the example grinding wheels with the spindle.
  • at least the housing part for the transmission have receptacles on the side walls, can be used in the handles.
  • Fig. 1 shows a perspective view of a hand grinder 10 in a schematic representation.
  • the hand grinder 10 is divided into a first region 12, a second region 14 and a third region 16.
  • the first region 12 comprises a handle 18 by means of which the hand grinder 10 can be held with one hand.
  • the first region 12 has a switch 19, which is provided for switching on and off a drive unit not shown in the figures.
  • the switch 19 is a so-called on / off switch.
  • the drive unit is a single-phase motor having a rotor and a stator.
  • the rotor or the drive shaft is coupled via a gear arrangement with a spindle 36.
  • the electrical cable can then have, for example, a power plug, via which the hand grinder 10 is connected to a power supply network.
  • the first region 12 further has on the underside of the handle 18 on an operating lever 20 which sets the electric motor in operation. So that the electric motor and thus the hand grinder 10 can be put into operation via the operating lever 20, the switch 19 must first be actuated.
  • the first region 12 also has a holder 24, on which a second connection 26 is held.
  • the second port 26 is coupled to a fluid supply line 28.
  • the second connection 26 has a standardized connection, so that a fluid line, for example a water-carrying line, can be connected via a corresponding connection connection.
  • the water supplied via the second connection 26 can be introduced into the fluid supply hose 28 at a specific pressure via further devices (not shown).
  • the operating lever 20 may be coupled to a valve arrangement which regulates the fluid or water supply via the second port 26 and the fluid supply line 28. When the operating lever 20 is actuated, the valve opens and the water is passed via the second port 26 and the fluid supply line 28 to a first port.
  • the second region 14 has a housing 30, which surrounds the drive unit or the electric motor.
  • the housing 30 further devices for the operation of the drive unit are also provided. These do not exhaustively include switching means, cables, cable clamps, bearing means and devices for storing the components.
  • the third region 16 includes at least one housing 32 for a transmission and a housing 34 for at least a portion of the spindle 36.
  • the housing parts 32 and 34 may be in one piece or be formed as connectable housing parts.
  • a transmission is arranged, which transmits the rotational movement of the rotor of the drive unit via toothed and bevel gears on the spindle 36.
  • the spindle 36 is rotatably mounted in the housing 32 and the housing 34 and protrudes with a threaded portion 38 from the housing 34.
  • the housing 32 has receptacles 40 on opposite sides. For example, handles can be used in the receptacles 40, whereby the hand grinder 10 can be pressed against a surface during operation.
  • the hand grinder 10 can be pressed over the surface 42 on a surface to be machined.
  • the surface 42 is free of other facilities, such as means for supplying water or other holding elements. This makes it possible to exert targeted pressure on the third region 16 in order to achieve a corresponding processing of surfaces.
  • different grinding wheels or other grinding and polishing can be firmly connected to the spindle 36.
  • the first region 12, the second region 14 and the third region 16 are connected to one another.
  • the first region 12, the second region 14 and the third region 16 are detachably connected to one another via screws.
  • a protective cover may be attached to the housing 30, so that dust and mist do not enter the housing 30 in ventilation openings during operation of the hand grinder 10. So that no dirt or moisture can penetrate into the housing 32 and 34, they have no ventilation openings and are formed closed. Furthermore, especially the lower portion of the housing 34 with an opening for the spindle 36 on an encircling seal.
  • Fig. 2 shows a schematic side view of the hand grinder 10 of Fig. 1 , In this illustration, the fluid path of the water is shown schematically over the thick line. The arrows 60 show the flow path of the water.
  • the fluid supply line 28 extends from the holder 24 on the underside 29 of the hand grinding machine 10 to a first connection 44.
  • the first connection 44 is arranged on the housing 34.
  • a conduit 46 extends in the housings 34 and 32 up to the top 42 of the housing 32. From there, the conduit 46 extends to a head end 37 of the spindle 36 and passes through the spindle 36 in a line section 48 down to the threaded portion 38.
  • the conduit portion 48 is a channel in the spindle 36.
  • a mechanical seal is provided which prevents leakage of water. The conduit section 48 and the channel then rotate in operation of the hand grinder 10.
  • the channel in the spindle 36 terminates at the bottom of the spindle 36 in at least one outlet opening.
  • the outlet opening may be provided on the underside of the threaded portion 38 or circumferentially on an overlying area.
  • the water enters via the channel at a lower outlet opening in the region of the threaded portion 38, so that the surface to be treated is moistened.
  • the conduit section 48 is formed by a hollow shaft which extends from a connection point 50 through the spindle 36.
  • the hollow shaft then ends in the lower region of the spindle 36 in the threaded portion 38 and guides the water to the area to be machined.
  • the spindle 36 rotates about the hollow shaft.
  • the spindle 36 is formed so that it is coupled via the bevel gears and gears with the drive unit, ie the electric motor.
  • the drive unit ie the electric motor.
  • different rotational speeds of the spindle 36 can be set via the transmission.
  • the rotational speed be adjustable.
  • the hand grinder 10 may for example have a controller.
  • the guidance of the conduit 46 upwards and through the housing 34 and the housing 32 also ensures that at least the transmission is cooled via the water taken up in the conduit 46. Accordingly, a heat transfer from the transmission to the fluid or the water takes place, so that over the outlet opening in the region of the threaded portion 38, a heated water is discharged.
  • heating the water is not detrimental to the processing of stone surfaces, for example, but may even be beneficial.
  • the water supplied via the second port 26 flows via the fluid supply line 28 to the port 44 and from there via the line 46 through the housing 32 and the housing 34 to the line section 48 and from the line section 48 via an outlet opening on the spindle 36 or a hollow shaft.
  • the first connection 44 is produced in one piece with the housing 34, for example in an injection molding process. Only sealing means are then attached to the first connection 44, so that the fluid supply line 28 can be tightly connected to the first connection 44. Further, during manufacture of the housings 32 and 34, channel structures are introduced into the sidewalls of the housing 32 and the housing 34, these conduits serving as conduit 46. For this purpose, the inside of the housing 32 is formed in the region of the connection point 50 as a further connection, so that water from a channel in the housing 32 via the connection point 50 either directly into a trained as a hollow shaft section 48 or via a arranged at this connection mechanical seal in a channel the spindle 36 is guided.
  • a water supply is provided without having to arrange water supply means on the outer walls of the housings 32 and 34 located in the work area. This allows a user, especially in the area of the housing 32 in the desired manner by applying the hand or otherwise exert pressure to apply a corresponding pressure on the surface to be machined.
  • 42 pressure can be applied over the entire top.
  • Fig. 3 shows a schematic side view of components of a hand grinder 10.
  • the housing 32 and the housing 34 and a part of a fluid supply line 28 are shown.
  • the formation of the line 46 and the line section 48 substantially corresponds to that in the FIGS. 1 and 2 Hand grinder 10 shown in particular Fig. 3 the fluid path of the water from a junction 52 from the first port 44 through the spindle 36th Fig. 3 shows how the conduit 46 and the conduit 46 formed by the channels in the housing parts 32 and 34 on the side walls of the housing 32 and 34 extends.
  • Fig. 4 shows a schematic front view of components of a hand grinder 10.
  • the channels are mainly in the area of in Fig. 4 not shown gear formed meandering, so that a large cooling surface is provided.
  • the channels formed in the housing walls of the housings 32 and 34 may have other structures.
  • conduit 46 formed by the channels can always run in the housing walls of the housings 32 and 34 or only in sections.
  • Fig. 5 shows a further schematic front view of components of a hand grinder 10.
  • Run lines 46 which may be formed, for example, again as channels in the housing parts of the housing 32 and 34, on the outer sides, wherein the lines or channels, the transmission (in Fig. 5 not shown) in the form of a square surrounded.
  • the lines 46 and the channels protrude beyond their points of connection with other channels or lines 46.
  • this illustration is only an example, although other forms are possible.
  • Hand grinders 10 shown further comprise further components such as springs, bearing rings, gaskets, bolts, screws, etc., which are not shown and described.
  • the hand grinders 10 have a thread that couples the drive shaft to the spindle 36.
  • the drive shaft and the spindle 36 in this case run at a right angle to each other, so that via a bevel gear of the drive shaft, a corresponding toothed or bevel gear of the spindle 36 is driven.
  • the spindle 36 is fixedly connected to this bevel gear or can be releasably connected to the bevel gear via locking means. Furthermore, the spindle 36 is secured against falling out. Through the threaded portion 38 different grinding wheels or other abrasive can be attached.
  • the hand grinder 10 is then placed on a surface to be machined, such as a stone surface, that the bottom or the tool side of the grinding wheel rests on the surface.
  • a grinding wheel is rotated and supplied with water via the above-described means, the water supply additionally causes cooling of the gear assembly in the hand grinder 10.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
EP16176640.7A 2015-07-13 2016-06-28 Meuleuse portative Not-in-force EP3117958B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102015111317.1A DE102015111317A1 (de) 2015-07-13 2015-07-13 Handschleifmaschine

Publications (2)

Publication Number Publication Date
EP3117958A1 true EP3117958A1 (fr) 2017-01-18
EP3117958B1 EP3117958B1 (fr) 2017-11-22

Family

ID=56344995

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16176640.7A Not-in-force EP3117958B1 (fr) 2015-07-13 2016-06-28 Meuleuse portative

Country Status (2)

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EP (1) EP3117958B1 (fr)
DE (1) DE102015111317A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109605152A (zh) * 2018-12-10 2019-04-12 江苏三叶智能装备有限公司 一种手推湿式砂轮机
CN115302378A (zh) * 2022-10-10 2022-11-08 格莱思顿电气(江苏)有限公司 建筑材料裁切设备

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2238096A (en) 1939-08-16 1941-04-15 Black & Decker Mfg Co Polishing and wet sanding
DE1039878B (de) 1957-02-28 1958-09-25 Licentia Gmbh Steinschleifer mit Wasseranschluss fuer Nasschliff
DE202004008100U1 (de) 2004-05-22 2004-08-12 Fuchs, Walter Injektionspolierer
DE60305539T2 (de) 2002-01-10 2007-05-03 Black & Decker Inc., Newark Getriebegehäuse
JP2012011513A (ja) * 2010-07-01 2012-01-19 Makita Corp 電動工具

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2238096A (en) 1939-08-16 1941-04-15 Black & Decker Mfg Co Polishing and wet sanding
DE1039878B (de) 1957-02-28 1958-09-25 Licentia Gmbh Steinschleifer mit Wasseranschluss fuer Nasschliff
DE60305539T2 (de) 2002-01-10 2007-05-03 Black & Decker Inc., Newark Getriebegehäuse
DE202004008100U1 (de) 2004-05-22 2004-08-12 Fuchs, Walter Injektionspolierer
JP2012011513A (ja) * 2010-07-01 2012-01-19 Makita Corp 電動工具

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109605152A (zh) * 2018-12-10 2019-04-12 江苏三叶智能装备有限公司 一种手推湿式砂轮机
CN115302378A (zh) * 2022-10-10 2022-11-08 格莱思顿电气(江苏)有限公司 建筑材料裁切设备

Also Published As

Publication number Publication date
DE102015111317A1 (de) 2017-01-19
EP3117958B1 (fr) 2017-11-22

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