CN1071174C

CN1071174C - Hand tools machine

Info

Publication number: CN1071174C
Application number: CN98103900A
Authority: CN
Inventors: P·霍泽尔; R·思姆; R·阻贝尔
Original assignee: Scintilla AG
Current assignee: Scintilla AG
Priority date: 1997-02-20
Filing date: 1998-02-20
Publication date: 2001-09-19
Anticipated expiration: 2018-02-20
Also published as: IT1298219B1; GB2322324A; GB9802647D0; ITMI980251A1; CN1191170A; DE19706671A1; GB2322324B

Abstract

A hand machine tool, in particular a drilling or impact drilling machine, has an arresting device (21) for a workspindle (11) drivable in a rotating and/or percussive manner. The arresting device (21) comprises a locking element (26), which is housing-fixed in the direction of rotation of the workspindle (11) and is positively engageable into a locking element receiver (25) non-rotatably connected to the workspindle (11). The locking element receiver (25) is disposed with an offset (v) relative to an annular groove (41) rotating with the workspindle (11). The at least one locking element (26), when spindle arresting is initiated, dips into the annular groove (41) and, while the workspindle (11) is rotating, is prevented from engaging into the locking element receiver (25).

Description

Hand tool

The present invention relates to a kind of hand tool, especially rig or percussive drill, it has casing, be installed in the casing, be used to drive the working shaft that drill bit rotates or impacts, and the locking device of working shaft is arranged, have a brake component of on the rotation direction of working shaft, fixing at least with casing, for at rotation direction locking working shaft, the containing seat rigid engagement of the brake component that brake component can be rotationally connected with and working shaft.

Disclose a kind of hand tool (DE4305967A1), disposed the mechanism that is used to lock working shaft.Locking mechanism has brake component, is used for meshing rigidly a part that is fixedly connected with rotating manner with working shaft.Brake component is lengthened in the electric switch zone of hand tool drive motors always, and only could operate when the drive motors no power.In this way, when motor is connected, stop the lock operation of axle, but it does not stop brake component is meshed, at this moment because rotator inertia, and may on the part that will mesh, produce annoying conversion noise and damage.Be used to monitor the no power state, and be used to stop the switchgear of brake component engagement too expensive comparatively speaking.

The purpose of this invention is to provide a kind of hand tool, it can economy lock working-spindle reliably, and parts are not damaged, and prevents when high speed rotating the casual locking of working shaft.

For this purpose, the present invention makes the containing seat of brake component have an engagement perforate at least in above-mentioned hand tool, the engagement perforate with around, towards local at least intersecting of cannelure that brake component opens wide.

According to hand tool of the present invention, have the following advantages: promptly only on working shaft that pause or slow-speed, just may make the brake component engagement with above-mentioned comparing.For the working shaft of fast commentaries on classics, for example under the situation that drive motor is energized, can not make the brake component engagement, so just stoped the casual locking of working shaft, and eliminated thing followed shortcoming.In this case, no longer need expensive switching device.

If the engagement side at brake component is provided with an engagement pin that removes corner angle, and is also suitable especially.Because the engagement pin has removed corner angle, as long as brake component stings into engaging hole slightly, when working shaft during in rotation, it is just extruded in engaging hole so.

Represent a kind of embodiment of the present invention in the accompanying drawings, and in the explanation of back, explained this embodiment in detail.

Fig. 1 has showed the longitudinal profile of percussion drill partly,

Fig. 2 has showed the side view of percussion drill lock gear partly,

Locking device when Fig. 3 has represented the working shaft rotation,

Locking device when Fig. 4 represents that working shaft is slack.

With the embodiment of electric percussion drill of 9 marks as a kind of hand tool, impact being drilled with shell 10 in Fig. 1, working shaft 11 has been installed in the inside in rolling bearing 13,14, and it can rotate, and can do limited moving axially.Working shaft 11 can be driven by gear 12 rotations by a drive motors of not representing in detail.For this reason, gear 12 is to be installed on the working shaft 11 in mode fixing on the direction of rotation.

Working shaft 11 can additionally by a beater mechanism 15 of selectively connecting, periodically impact and move in rotation in the axial direction.Therefore, so-called percussive drilling just becomes possibility.Be designed to the beater mechanism 15 of card slot type,, act on working shaft 11 by having two flanges on equally distributed vis-a-vis and in a circumferential direction draw-in groove projection of end face side and draw-in groove inclined-plane 16,17.The flange and the casing that have draw-in groove inclined-plane 16 are fixed, and are positioned on the ring 16b in the support of bearing 18.Second flange that has draw-in groove inclined-plane 17 is arranged on the end face of gear 12, and gear 12 can move axially with working shaft 11.When percussion drilling, two draw-in groove inclined-plane flanges 16,17 compress drilling tool by the operator, overcome the power of spring 19 and intermesh.One side of compression spring 19 is supported on the ring 16b and the support of bearing 18 by pad 20, and opposite side is supported on the boss rank of working shaft 11.When working shaft 11 rotation against each other the draw-in groove inclined-plane 16,17 that slides, cause the impact that moves axially of working shaft 11 in known manner.Gear 12 has disposed cylindrical tooth 24.For can be working shaft 11 to block with the fixing mode of casing, hand tool 9 be equipped with locking device 21.On the end face 23 of the support of bearing 18, gear 12 has the holding portion 25 of a brake component at gear 12, is used for and brake component 26 rigid engagement that are designed to brake bars.Brake component 26 is bearing in the stepped dead eye 22a of axle sleeve 22 and can moves axially.Axle sleeve 22 is pressed into again in the hole 27 of the support of bearing 18 conversely.

The end that faces gear 12 with the back 32 of brake component 26 highlights in dead eye 22a, forms the pin 28 of cylindrical, a terminal rounding.In the perforate 29 of casing 10, a button 30 is arranged, the power that it can overcome helical spring 31 radially moves inwardly.On the ledge 34 of button 30, fixed a reed 35, the spring end freely 36 that reed 35 has a process to turn back.Reed 35 is round ledge 34, the layout that approximately takes the shape of the letter U, its freely spring end be close to partly on the control curve 33 of button 30.The trend of control curve 33 and the longitudinal axis 44 of brake component 26 are at an angle.Brake component 26 is being subjected to the pressure of spring 38 on the direction of control curve 33, and is close to reed 35, and reed 35 is used to control the abrasion protection of curve 33.One end of spring 38 is supported on the axle sleeve 22, and the other end is sold on 28 the thrust ring 39 having compressed.

If the operator on the direction of arrow 45, radially inwardly, depress button 30 towards longitudinal axis 44, so, control curve 33 moves inwardly with reed 35, and is pasting the top slip of sell 28 rounding.Simultaneously brake component 26 is axially overcoming spring force 38, moves (also can referring to Fig. 3 and Fig. 4) towards the direction of the containing seat 25 of brake component.

The containing seat 25 of brake component is made of engaging hole 25a, and engaging hole 25a and one are intersected at least partly around engaging hole, the cannelure 41 that opens wide towards brake component 26.Engaging hole 25a for example by six on the end face 23 of gear 12, along the circumferential direction equally distributed blind hole constitutes.The diameter of blind hole 25a is slightly greater than corresponding engaging pin 40 on the brake component 26.Blind hole 25a is radially setovering slightly with respect to cannelure 41.Between the center line 42 of cannelure 41 and blind hole 25a axis 43, one section radial deflection is arranged apart from V (Fig. 2).

The partial sectional view of locking device 21 when Fig. 3 has represented working shaft 11 rotations.At this moment button 30 is radially depressed inwardly by the operator, and brake component 26 is by reed 35 and control curve 33, and axially the direction towards the containing seat 25 of gear 12 inside brake parts moves.Because brake component 26 just had a tangible mobile space (not showing in the drawings) with respect to hole 22a, this just make brake component 26 can with the longitudinal axis 44b slightly deflect of its longitudinal axis 44 with respect to hole 22a.Based on this mobile space, make brake component 26 can sink in the cannelure 41, like this, brake component 26 is imported in the groove when working shaft turns round.At this moment, brake component 26 is close to the lateral surface 41a of cannelure 41 with an inclined-plane 40a of engaging pin 40.In the zone of blind hole 25a, just the medial surface 41b of cannelure 41 is cut off (Fig. 2) by blind hole.When gear 12 was in turned position with blind hole 25a centering, brake component 26 further was supported on the lateral surface 41a so.

If the rotary speed of working shaft 11 reduces to a certain extent, perhaps working shaft 11 stops operating, brake component 26 just can axially slide along lateral surface 41a with inclined-plane 40a so, and radially inwardly, causing containing seat 25a with blind hole axially meshes, see Fig. 4, at this moment button 30 persons of being operated radially press deeplyer inwardly.

When Fig. 4 has represented that brake component 26 is meshed with its containing seat 25, the cutaway view of locking device 21.Gear 24 and working shaft 11 when being in this position, are blocked by rigid engagement on direction of rotation with respect to casing 10.The central shaft 43 of blind hole 25a is radially being aimed at the longitudinal axis 44 of dead eye 22a basically, and the longitudinal axis 44 of brake component 26 just overlaps each other with longitudinal axis 44b like this.Yet axis 43 also can be slightly with respect to longitudinal axis 44 skews.This will have been compensated by the mobile space of brake component 26 in hole 22.

The minimum velocity of rotation that brake component 26 can mesh with the containing seat 25 of brake component depends on different factors.Big or small ratio between the wherein important perforate cross section that comprises brake component diameter, groove width and blind hole 25a.Also have the operator by button 30 applied pressures, and other physical dimension relation, for example the angle of guiding surface etc. is also played a role.When the perforate cross section of blind hole 25a relatively hour, have only when working shaft 11 pauses and just may mesh.If the ratio between the containing seat diameter of perforate cross section and brake component is bigger, be convenient working shaft 11 when rotating lentamente so, brake component 26 also might mesh.Described in an embodiment hemispherical rounding top by means of engaging pin 40 can stop fully when working shaft 11 rotates lentamente, an engagement among brake bars 26 and the blind hole 25a.Like this, brake bars 26, still overcomes by operator's applied pressure vertically and moves backwards although mesh with blind hole 25a because the top is rounded.Simultaneously, the gearing noise that produces has in this case also indicated the operating condition of working shaft 11 by way of parenthesis to the operator.

The present invention is not limited to described embodiment.So the engagement perforate 25a that is used for brake component 26 greater or less than six can be arranged, and it might not leave no choice but make blind hole certainly, contain seat hole, for example through hole, pit etc. arbitrarily but also can make in the end face of gear 12.Brake component contain seat 25 on the end face 23 that can be arranged in gear 12, also can be arranged in another place, for example on the excircle of gear 12, be used for doing the warp-wise engagement with brake component.The working shaft 11 that has locking device 21 also can be arranged on the jackshaft, and this root jackshaft is connected to rotate fixing mode with the main shaft of percussion drill.

Claims

1. hand tool, especially rig or percussive drill, it has casing (10), be installed in the casing (10), be used to drive the working shaft (11) that drill bit rotates or impacts, and the locking device (21) of working shaft (11) arranged, has a brake component (26) of on the rotation direction of working shaft (11), fixing at least with casing, in order to lock working shaft (11) in rotation direction, containing seat (25) rigid engagement of the brake component that brake component (26) can be rotationally connected with and working shaft (11), it is characterized in that, the containing seat (25) of brake component have at least one the engagement perforate (25a), the engagement perforate with around, towards local at least the intersecting of cannelure (41) that brake component (26) opens wide.

2. hand tool as claimed in claim 1 is characterized in that, the containing seat (25) of brake component has six equally distributed in a circumferential direction engaging holes (25a).

3. hand tool as claimed in claim 1 or 2 is characterized in that, the containing seat (25) of brake component is arranged on the gear (12), and this gear is positioned on the working shaft (11) in the torsion proof mode.

4. hand tool as claimed in claim 3 is characterized in that, the containing seat (25) of brake component is arranged on the end face (23) of gear (12).

5. the described hand tool of one of claim as described above is characterized in that having at least a brake component (26) to be placed on movably vertically in the dead eye (22a) of axle sleeve (22).

6. hand tool as claimed in claim 5, it is characterized in that, at least one brake component (26) mobile space is arranged in the following manner is received in dead eye (22a), and promptly the longitudinal axis (44) of brake component (26) can slightly depart from the longitudinal axis (44b) of dead eye (22a).

7. hand tool as claimed in claim 6 is characterized in that, cannelure (41) has a center line (42), and the axis (43) of the containing seat (25) of its position and at least one brake component has a field offset (V).

8. the described hand tool of one of claim as described above, it is characterized in that, button (30) has been placed in activity in the perforate (29) of casing (10), when its pressurized moves, at least one brake component (26), on the direction of the position that is meshed with the containing seat (25) of at least one brake component towards it, be subjected to the loading effect of certain power.

9. hand tool as claimed in claim 8 is characterized in that, has a control curve (33) and button (30) to be fixedly connected, and the trend of control curve and the longitudinal axis (44) of at least one brake component (26) are at an angle.

10. hand tool as claimed in claim 9 is characterized in that, at least one brake component (26) is subjected to the loading of spring force (38) on the direction of control curve (33).

11. hand tool as claimed in claim 10 is characterized in that, control curve (33) is covered by a reed (35).

12., it is characterized in that, the engagement bolt (40) of a rounding being arranged at least in the engagement side of a brake component (26) as one of above-mentioned claim described hand tool.