CN1190364A

CN1190364A - Orbital sander

Info

Publication number: CN1190364A
Application number: CN97190476A
Authority: CN
Inventors: R·福赫斯
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 1996-05-02
Filing date: 1997-01-28
Publication date: 1998-08-12
Anticipated expiration: 2017-01-28
Also published as: EP0842012A1; WO1997042000A1; CN1115232C; DE59707033D1; JPH11508831A; DE19617474A1; EP0842012B1

Abstract

The invention concerns an orbital sander (9, 110, 210) with a drive shaft (18, 124, 224) which is rotatably mounted in a housing (12, 112, 212) and, via an eccentric pin (20, 126, 226), imparts an orbital movement to a grinding disc (10, 118, 268) which is resiliently connected to the housing (12, 112, 212) via at least one oscillating element (23, 138, 238). The orbital sander can be converted into a rough-grinding apparatus in that a preferably orbicular grinding disc (118) can be coupled in a rotationally rigid manner to the eccentric end of the drive shaft (18, 124, 224), preferably to the eccentric pin (20, 126, 226), in an eccentrically offset manner such that the grinding disc can be driven in a centrally rotating manner by the drive shaft (18, 124, 224) and uncoupled from the at least one oscillating element (23, 138, 238).

Description

Operated orbital sander

Prior art

The present invention relates to a kind of operated orbital sander of claim 1 preamble and a kind of mill of claim 9 preamble.

The triangle mill of EP610 810 known a kind of operated orbital sanders and triangle abrasive disc produce eccentric circular motion jointly and do not rotate.The mill of this operated orbital sander carries out circular motion with one about 1.5 millimeters eccentric stroke, thereby makes the single abrasive particle of the abrasive disc that is fixed on the mill have only very little impulse stroke.Therefore, stock removal or grinding efficiency are quite low.

Therefore this operated orbital sander is not suitable for roughly grinding large tracts of land such as timber floor specially for the design of the angle of fine grinding less area, particularly workpiece and limit.

EP 623 422 is known a kind of triangle sanding machine with a speed change transmission, in first switching stage of this sanding machine, the rotation-oscillating motion of mill be the operation of operated orbital sander and in its second switching stage the circumference-rotatablely move of mill be that the operation of eccentric sanding machine is adjustable.

This triangle sanding machine has been unified the characteristics of rotation-operated orbital sander and eccentric sanding machine, also can be used for effectively the fine grinding small size and the corase grind large tracts of land.

This triangle sanding machine is because that the operated orbital sander of variator drive ratio routine is housed is heavy and expensive, and than the surface polisher of general rotation at a high speed to grind off dynamics little.

Advantage of the present invention

In contrast, the mill of the operated orbital sander of the described feature of claim 1 or claim 9 has such advantage according to the present invention: just can realize a kind of sanding machine with seldom the manufacturing expense and the basic structure that need not change operated orbital sander, it both had been applicable to known up to now fine grinding, particularly grind at the angle, this hour angle mill carries out circular motion and does not rotate, be applicable to corase grind again, this moment, the circle mill rotated at a high speed.And the angle mill can be changed mutually especially simply and fastly with the circle mill.

So just created a kind of operated orbital sander, it both can be used as has non-rotaryly and use with the surface polisher of the mill of driven shaft center rotation with respect to driven shaft, can be used as atomizer mill again and uses.It resembles light-duty but is light the grinding machine that power is little, but resembles the heavy not light commercial Flat grinder efficient equally.

Do not insert tightly in this hole with axial lock rotatably by the axle of centre bore of power transmission shaft band, can especially easily repack operated orbital sander into surface polisher mill.

Can prevent fully that by a lock shaft that is parallel to the axle extension mill from rotating with respect to power transmission shaft, this lock shaft is engaged on the eccentric shaft by the profile connection, and blind hole and eccentric shaft that axis hole is parallel on the eccentric shaft extend along certain radial distance.

The plane mill can prevent loosening unintentionally by a padlock between plug pin and power transmission shaft upper extent, wherein, that can move radially in transmission axial wall in the blind hole scope, engageable in a cannelure of plug pin by the ball of a spring-loaded.

By between circle mill and cutter chuck, existing certain distance can make operated orbital sander again, and there is not big friction loss as surface polisher work.

As operated orbital sander or as the pattern conversion that surface polisher uses is to realize especially easily, promptly get final product by circle mill and angle mill, the particularly replacing of triangle mill, triangle mill and power transmission shaft do not keep directly rotation synchronously, and can removably not be rotatably connected with hammer with padlock, particularly the padlock between triangle mill and the cutter chuck can and unclamp by means of a manual active button locking.

Because mill is a wear-out part, thus the angular region with respect to the quick position conversion of the hammer of operated orbital sander or when the surface polisher mill be convenient to that to change be a big advantage.The acting in conjunction of this advantage by the locking member of mill locking member and hammer or power transmission shaft obtains.Like this, mill also has feature of the present invention, and it also is an important components or spare part.The advantage of this mill is, it can be connected with center transmission shaft realizes rotation synchronously, and promptly it has a plug pin and a synchronous handle and realizes and being connected of power transmission shaft.

Accompanying drawing

Describe several embodiments of the present invention in detail below in conjunction with accompanying drawing.

Accompanying drawing is represented:

Fig. 1 represents the longitudinal section of operated orbital sander first embodiment of the present invention;

The bottom view of Fig. 2 presentation graphs 1 hammer;

Fig. 3 represents to have the triangle mill and is used for the part Zoom Side diagrammatic sketch of another embodiment of operated orbital sander of the present invention of fine grinding;

The top view of Fig. 4 presentation graphs 3 operated orbital sanders;

Fig. 5 represents to change the part side view that the triangle mill is used for Fig. 3 operated orbital sander of dish type sanding machine with the circle mill;

The top view of Fig. 6 presentation graphs 5 sanding machines.

The explanation of embodiment

Part side-looking shown in Figure 1 be furnished with a grinding tool 10 that constitutes as the nog plate of triangular symmetry with the electric hand-operated grinder analysed and observe of part as operated orbital sander 9, the downside of nog plate is formed and is had one deck young pilose antler layer and is used for supporting abrasive disc not shown in the figures by plastics.

The casing 12 of operated orbital sander 9 is made up of two halves casing 121,122, and the two halves casing closes up mutually along a branch groove part 123 that is parallel to the extension of the casing longitudinal axis.A motor 13 is housed in the casing 12, from figure, can only sees the fan 15 that is contained on the driven shaft 14.A combined floodgate-separating brake switch 16 that is arranged on casing 12 tops is used for switching on and off motor 13.Driven shaft 14 drives power transmission shaft 18 by a bevel gearing 17, and this power transmission shaft rotatably is contained on two ball bearing 19a and 19b that are fixed on the housing, and protrudes its eccentric shaft 20 from casing 12 on the lower surface of casing 12.

The inner axle of another ball bearing 21 is not to radially outward being contained in movably on the eccentric shaft 20, and this ball bearing is fixed in the hammer 22 of a bowl-type with its outer shroud, particularly is cast in wherein.Hammer 22 made of plastic is fixed on the casing 12 by a pendular body 23, and when eccentric shaft 20 rotations, this pendular body rotates not together, so only produce circular swing.

Grinding tool 10 is clamped on the hammer 22 by an action button 25 manual fast locks 24 with the corresponding profile connector that is fixed on hammer side or tool side and with one.Grinding tool 10 lies on the bearing-surface 37 of bowl-type hammer 22, this bearing-surface makes it eye-catching and dust suction space 26 of hammer 22 sealing with it with a line of pulling out forward, this space is opened wide towards the side that will process of not shown workpiece by the respective aperture on air suction opening on the grinding tool 10 27 and the abrasive disc on the one hand, link up by a bellows 28 and the dust absorption passage 29 in the casing 12 again on the other hand, this channel end is connected on the independent air exhauster.

The hook 42 that constitutes on the locking member 40 of tool side and the grinding tool 10 constitutes an integral body, and these hooks are in staggered distribution mutually by the identical anglec of rotation, and stretch out from grinding tool 10 upsides towards hammer 22 bearing-surfaces 37.For simplicity, these hooks 42 constitute on the outside of sleeve 38, and its inner surface is supporting a polygonal face 39, and this coacting locking member 41 that is located at the chuck side is made of the spring steel wire 43 of an annular curved.

As can be seen from Figure 2, on the downside of chuck 22, in the outside of axle 32, constitute the polygonal face 36 of a symmetry, it is made up of three identical arc sections 361 of 120 ° of staggering separately, these arc sections connect by 120 ° the identical arc section 362 of staggering mutually, and the arc radius of arc section 362 is greater than the arc radius of arc section 361.

Spring steel wire 43 have with sleeve 38 on hook 42 the same number of, here be three by radially inner recessed section 431, they and the hook 42 corresponding corners that stagger identical are mutually arranged.Spring steel wire 43 is contained on the hammer 22 and can rotates in the translot 51 of brace 44 or move, these braces are distributed on the axle 33 coaxial pitch circles with axle 32 or ball bearing 21, and constitute whole outstanding from hammer downwards with hammer 22.Brace 44 is arranged at recessed section 431 two ends a pair of brace is arranged respectively on the locked position of spring steel wire 43 in pairs like this, as shown in Figure 2.These braces are to also being to stagger mutually by identical angle of circumference.The spring steel wire 43 of annular curved is drawn with two arms that roughly radially are parallel to each other 432 and 433, and wherein the right angle, end of arm 432 bends up and be positioned at the rectilinear end front of arm 433, and the action button 25 of quick lock mechanism 24 is fixed on the free end of arm 432,433.For this reason, the downside of action button 25 is provided with groove and the locking flange that does not illustrate in the drawings accordingly.The arm 432 of spring steel wire 43 is pressed in this groove, and it bends up end and contacts with groove, and 433 on another arm snaps in another groove that does not illustrate among the figure and not removable.

Spring steel wire 43 present available action buttons 25 by translot 51 guiding of brace 44 rotate in the spring steel wire plane, thereby make on locked position, heeled out recessed section 431 to skid off from hook 42 by hook 42, so spring steel wire 43 radially outer parts just move on on recessed section 431 the position, thereby discharge hook 42.Grinding tool 10 can be left behind from hammer 22 with hand in the direction of axle 33 then.Also (make at above-mentioned grinding tool 10 under the situation of nog plate of triangular symmetry) at replaceable grinding tool 10 on this position of quick lock mechanism 24 and to rotate 120 ° respectively, with just grinding tool being reloaded in the hammer 22 before the angle.So just can make the angular region uniform wear of abrasive disc and don't need unclamp from the young pilose antler layer of hammer 22.Be bearing on the bearing-surface 37 of chuck 22 at pack into by the staggered cooperation of two polygonal faces 36,39 grinding tool 10 and grinding tool 10 after, action button 25 is along clockwise direction shown in Fig. 2 arrow 30 toward back rotation, till spring steel wire 43 is in locked position shown in Figure 2.Then on the hook 42 that recessed section 431 of spring steel wire 43 hangs over grinding tool 10 again, then this grinding tool just secure lock on hammer 22.When locking member 40 appropriate structuring of tool side, when for example having suitable elasticity, grinding tool 10 can be clipped on the chuck 22 as the languid of buckle 42 on free end and spring steel wire 43 or recessed section 431.Like this, the rotation sheath of action button 25 and the spring steel wire 43 in the translot 51 of brace 44 all can be cancelled.

Fig. 3 representation class is similar to the part of front portion of shell 212 of a kind of operated orbital sander 210 of Fig. 1 or Fig. 5.Triangle mill 268 is connected with power transmission shaft 224 by hammer 222.The thrust ring 256 of hammer 222 blocks 258 outsides, center annular district of hammer 222, and this hammer is concentric with first rolling bearing 234.The cross section that thrust ring 256 is transited into the weak point that has an outer inclined-plane 259 is hook-shaped radial end face thrust ring 257.

When triangle mill 268 is contained on the cutter chuck 222, the thrust ring 257 of mill 268 passes the ring spring 260 by means of the action button rotation, this spring is equivalent to the ring spring 43 of Fig. 1 and Fig. 2, and be turned back to its radially narrower scope at ring spring 43 after retainer shaft to not moving.

Hammer 222 made of plastic is fixed on the casing 212 by the body 223 that waves of a corrugated film shape, and hammer rotates not together when eccentric shaft 220 rotations like this, does not rotate so produce circular motion only.

Can know among the figure and find out the ball 250 that is arranged on power transmission shaft 224 walls and spring 252 (not resembling the axle in the blind hole 228 of being fixed on shown in Fig. 5).In addition, the air suction opening 266 that passes through of the dotted line abrasive dust of indicating to absorb.

By rotating an active button 262 ring spring 260 is rotated together, so this spring resembles the radial extension that cracks it open the spring steel wire 43 that Fig. 1 and Fig. 2 describe by identical mode, mill 268 just can axially take off then.

Fig. 4 top view represents that operated orbital sander 10 makes the triangle sanding machine, and its mill 268 available active buttons 262 are dismantled easily or locked.

Fig. 5 represents basically an enlarged section consistent with Fig. 1 operated orbital sander 9 or Fig. 3 operated orbital sander 210, and the front portion of shell 112.

Circular only have the circular abrasive disc 120 that an overlap joint that is not shown specifically in by a figure connects at the mill shown in the side cross-sectional, view 118.On a side of the mill 118 of abrasive disc 120, connect a hammer 122 with certain axial distance, but this hammer is pressed Fig. 3 clamping triangle mill 268, and an available active button 162 dismantles, do not rotate and prevent the locking of axial play, but then only has a function of using as dust shield by Fig. 5.

A power transmission shaft 124 that be rotatably connected with motor and rotatable supporting in housing rolling bearing 136 is connected with mill 118 with hammer 122.The free end of power transmission shaft 124 makes eccentric shaft 126, and this eccentric shaft is located at interior ring 133 below, that be pressed into the rolling bearing 134 in the hammer 122 with its outer shroud 135 by one and does not embrace rotatably.Rotating drive shafts 124 does not make its rotation because hammer 122 carries out circular motion only with respect to rotating freely of power transmission shaft 124.

Eccentric shaft 126 has a mill side uncovered blind hole 128 concentric with the axis of power transmission shaft 124.Axle 130 that is not rotatably connected with mill 118 of engagement in blind hole 128.Mesh by profile between mill 118 and eccentric shaft 126 mill 118 is rotated synchronously, wherein mill 118 little axial synchronizing shaft 131 is engaged in the end-face hole 132 on power transmission shaft 124 walls.

Hammer 122 by a corrugated film shape wobble-member 138 flexible fastenings or be bearing on the shell 112.The interface 142 of bellows 146 inserts in the hole 141 of hammers 122, and this bellows is with its free end and not shown passage alignment that is equivalent to Fig. 1 dust absorption passage 19 corresponding to interface 142.

Synchronizing shaft 131 is engaged in the little end face axis hole 132 parallel with the blind hole 128 of eccentric shaft 126, so that mill 118 rotates synchronously.This synchronizing shaft 131 has certain radial distance to be arranged on the mill 118 with axle 130.The axis hole 133 corresponding with synchronizing shaft 131 is parallel to that blind hole 128 is provided with and is uncovered in the free end upper millstone side of eccentric shaft 126.

End play 147 as can be seen between mill 118 and hammer 112 is even this gap also has only inappreciable reducing when axially pressure affacts on the mill 118 in the operated orbital sander course of work.Therefore, the mill 118 on the hammer 122 can not contact, thus mill 118 with respect to hammer 112 rotation and do not rub, and operated orbital sander 110 as disc sanding machine with the center rotation, particularly the mill 118 of high-speed motion carries out work.

Inserting axle 130 has a cannelure 148 in the upper end, can embed protrusion ball 150 outside in this groove, and this ball loads locking by a spring 152 and moves preventing, and in the radial hole 151 on blind hole 128 scope intermediate solid drive shafts 124 walls of packing into.Spring-loading ball 150 and cannelure 148 have been set up a upper end chucking and have been connected between plug pin 130 and power transmission shaft 124, thereby the insertion axle 130 that has prevented mill 118 produces unintentionally loosening from blind hole 128, thus mill 118 be fixed on prevented on the operated orbital sander 110 loosening unintentionally.Operator's only with hand is axially dismantled mill and just can be easy to carry out cutter use replacing and not need aid.

Air suction opening 154 axial break-through mills 118 shown in the dotted line and as dust suction usefulness, the mill dirt that produces when grinding are by bellows 146 and dedusting passage 144 outwards in dust bag of input.

Fig. 6 represents circular contour and the layout of action button 162 and the curved shape of casing 112 of mill 118.

Because Fig. 5 and round mill 118 shown in Figure 6 can be changed with Fig. 3 and Fig. 4 triangle mill 268 in a manner described, so operated orbital sander 109 uses by the atwirl rough tool that the structure of Fig. 5 and Fig. 6 can be used as surface polisher or disc sanding machine, then can be used as the triangle sanding machine of circular motion rather than fine grinding that rotatablely moves or angle mill usefulness by the structure of Fig. 3 and Fig. 4.

Among the not shown embodiment with profile engagement between mill and eccentric shaft, without synchronizing shaft and axis hole, but the polygon axle at a center is set on mill, this is engaged in the polygon mating holes at a center of power transmission shaft.

Claims

1. have a shell (12,112,212) operated orbital sander (9,110,210), the power transmission shaft (18 of an electric motor driven rotatable supporting is housed in this shell, 124,224), this power transmission shaft is with an eccentric shaft (20,126,226) make one by at least one rocking element (23,138,238) with shell (12,112,212) elasticity connects and movable mill (10,118,268) produce orbital motion, it is characterized in that, the mill (10 that waves without track, 118,268) and with a common and power transmission shaft (18,124,224) rotate, preferably heart and not being fixed on this power transmission shaft in the Yuan Xing mill (118), particularly an eccentric shaft (20 with not revolving, 126,226) on.

2. press the operated orbital sander of claim 1, it is characterized in that, eccentric shaft (20,126,226) has a centre bore (128) with respect to power transmission shaft (18,124,224), and the plug pin (130) of mill (118) can insert in this hole and not rotate, but axial locking particularly.

3. by the operated orbital sander of claim 1 or 2, it is characterized in that mill (118) has a synchronizing shaft (131) that extends in parallel with insertion axle (130), this axle is engaged in the eccentric shaft (126) with the profile connection, particularly in the engaging hole that end face is uncovered (132).

4. by the operated orbital sander of claim 3, it is characterized in that the hole (128,228) that engaging hole (132) is parallel to eccentric shaft (126) has certain radial distance to extend from this hole.

5. press the operated orbital sander of claim 4, it is characterized in that, have a chucking to connect between the upper extent of inserting axle (130) and power transmission shaft (124), wherein the ball (150) that move radially, that supported by spring (152) of on power transmission shaft (124) wall in centre bore (128) scope is engaged in the cannelure (148) that inserts axle (130).

6. by each operated orbital sander of aforementioned claim, it is characterized in that between circular millstone (118) and hammer (122), an end play (147) being arranged.

7. by each operated orbital sander of aforementioned claim, it is characterized in that, mill (118) can with an angle mill particularly triangle mill (268) change, this triangle mill can not be connected with hammer (122,222) rotatably with removably with padlock.

8. by the operated orbital sander of claim 7, it is characterized in that the padlock between triangle mill (168) and the hammer (122) can be locked with hand and unclamps with an active button (162).

9. press the mill of a kind of operated orbital sander (10) of claim 1 preamble, it is characterized in that this mill, particularly circular millstone (118) can the center be connected rotatably synchronously with power transmission shaft (124).

10. by the mill of claim 9, it is characterized in that, this mill, particularly insert axle (130) and synchronizing shaft (131) and power transmission shaft (124) realization profile and be connected by one.