DE8319187U1 - ELECTRICALLY DRIVEN IMPACT DRILLING MACHINE - Google Patents

Description

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description

The invention relates to an electric motor driven hammer drill with an axially displaceably mounted output shaft / which carries a detent disc, which is in Schiagböhrbetrieb cooperates with a counter-detent disc fixed to the housing and with a switching device, due to the axial displaceability of the output shaft to keep it out of engagement during drilling operation of the detent disc is limited, whereby the toggle

Device in the area of the drilling machine neck

having this neck enclosing switching ring, by means of which an axial bearing carrier by rotation is axially movable between its drilling position and the hammer drilling position.

In one known from DE-OS 30 12 637

The hammer drill has the switching device on a thread through which the axial bearing support is axially adjustable. Since this thread has a | has a relatively large diameter, is the

Considerable manufacturing effort. To switch

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a relatively large switching path is required, so that switching is time-consuming. Under In some circumstances it is not noticed that only an incomplete switchover has taken place, so that only one in percussion drilling mode. Part of the real existing impact energy is available.

In avoiding these disadvantages, the object of the present invention is to provide a hammer drill to improve the type mentioned so that the switching device short switching paths has, which allows rapid, safe switching.

To solve this problem, the invention provides that at least in the axial direction fixed to the housing a support disk is provided over which the axial bearing bracket is supported and that at least an axial projection and adapted an axial recess on the support disc or on the axial bearing ■ carrier are provided through which, depending on the relative rotational position of the support disc and the axial bearing carrier via the axial bearing the detent washers except

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Engagement are held (drilling position) or can come into engagement with each other (hammer drilling position) .

A particularly low construction weight with simply shaped parts can be achieved that for rotational adjustment of the support disc or the axial bearing carrier is connected to the support disk or the axial bearing carrier Rotary lever · is guided to the outside through the housing to the switching ring. Advantageous can the rotary lever be a flat stamped part in a breakthrough from. cylindrically shaped Axial bearing part penetrated in the direction of rotation is coupled with it. For the rotary coupling, the Rotary lever has at least one inwardly protruding nose that is in a longitudinal groove of the axial bearing carrier intervenes. As a result, the axial bearing carrier can move in the axial direction between its Shift drilling position and its percussion drilling position without this axial displacement over the rotary lever must be passed on to the outside to the switching ring.

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A squat, short design is made possible by the fact that the end or ends of the rotary lever are optionally received in a recess of the switching ring, the ends protrude through the spindle neck in breakthroughs.

The support disk penetrated by the output spindle can have two projections symmetrically in a material-saving manner have and the axial bearing support correspondingly two axial recesses, wherein the Projections are preferably formed by embossments and the recesses, preferably by a radially continuous groove.

Further designs according to the invention are the Subclaims to be taken from and with their 5 advantages explained in more detail in the description below. In the attached drawings shows:

Figure 1 is a partial longitudinal section through a hammer drill,

Figure 2 is a partial plan view partially in Section in the direction of arrow I];

in Fig. 1 and

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Figure 3 shows a cross section through the

Spindle neck along line III-III

■ in FIG. 1.

In the only illustrated Ausführungsbeispxel a hammer drill is in two-shell Housing 1, a drive motor 2 is arranged, the pinion 3 via a gearbox 4 with a Output shaft 5 can be driven. One end of the output shaft 5 is in an intermediate plate 6 stored, while in the spindle neck 7 a

Axial bearing 8 is arranged, which also provides radial guidance for the output shaft. 5 guaranteed.

The output shaft 5 can be displaced to a certain extent in the axial direction. One way the displaceability is limited by the thrust bearing, in the other direction by a the output shaft 5 fastened detent disk 9 and a counter-detent disk fastened in the housing 1 10. These lock in place in the stop drilling mode

'20 over the two disks 9 and 10 in a known manner

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each other * In drilling operation, the axial displaceability of the output shaft 5 is further limited by means of a Umschai-tvorrichtung 11, so that the two disks 9 and 10 can no longer come into engagement with one another. For this purpose, a support disk 12 is provided in the housing 1 and an axial bearing carrier 13 on which the axial bearing 8 can be supported during drilling operation. The axial bearing support 13 is a round bushing which surrounds the output shaft 5 and which has two recesses 14 in the form of a transversely continuous groove on its end face facing away from the axial bearing 8. Adapted to the grooves, the side of the support disk 12 facing the axial bearing carrier 13 has two axial projections 15, which engage in recesses 14 during hammer drilling and are supported on the end face of the axial bearing carrier 13 during drilling so that the output shaft can be moved axially via the axial bearing 8 5 and to prevent the disks 9 and 10 from ratcheting. The Vor jumps 15 are material-saving simple forms.

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The thrust bearing support is used to activate the switchover 13 each have a longitudinal groove 16 on two longitudinal sides, in each of which a nose 17 a rotary lever 18 protrudes. This rotary lever 18 is designed as a flat stamped part. He encloses with an annular part 19 which carries the lugs 17 on its inside, the Axial bearing support 13 so that it is axially displaceable in the rotary lever 18. The rotary lever 18 has two symmetrical arms 20 which, in slot-like openings 21, form the spindle neck stick through. The ends 22 of the arms 20 are each * - Weil in a recess 23 of a switching ring

24 recorded.
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The switching ring 24 is partially rotatable on the spindle neck 7. It is secured axially by an at least partially circumferential groove

25 in the spindle neck 7, in the two inwardly protruding projections in the exemplary embodiment

26 dss switching rings 24 protrude * The assembly can be easy durcji pushing the switching ring 24 over the spindle neck 7 take place when the switching ring 24 consists of elastic plastic insofar The assembly can be facilitated that

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the snap-in projections 26 of the peeling ring 24 each of a resilient tongue 27 are arranged at the end.

For securing the "drilling" and "hammer drilling" switch positions and for clearly noticeable switching the switching ring 24 is designed to be latched accordingly * For this purpose, there are 25 in the groove two recesses 25 ', 25 "are provided in the area of the displacement path of the projections, in which the projection 26 in the. Working position engages. Between the recesses 25 ', 25 " is an intermediate elevation 28 / due to the resilient resilience of the projection when twisting 26 the latching resistance is effected. The recesses 25 ', 25 "and also the Tip of the increase 28 deeper, so that the continuous groove 25 to the extent that the axial position of the Switching rings 24 with the projections 26 ensure

- End of description -

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Claims (11)

DREISS,: H © SpVt: HJ ^ N & :. FUHLENPORF Hans LANQOSCH ... <·> "VATi = NTANWALT ^ P-7000 STUTTGART Dipl'-Ina. (1963-1981) GEROKSTFIASSg 6 UWE DREISS Ββ ^ European Patent Office approved Representative Tp (071 «24 57 34/44 Dr-JUr11DIpHnO11M-Sc. European Patent Attorneys JQIDEAPAT HHNZ HOSENTHIEN γ * 7.22247 | dead Dr.-Ino.i DIpl.-lno. .—. JÖRN FUHLENOORF P for visitors D | p | , -Inq. LLJ DREISS, HOSENTHIEN & FUHUENOORF, D-7000 STUTTGART 1 Applicant; Metabowerke GmbH + Co. Gerberstrasse 31 Nürtingen LJ AmM. Act. Z. Your reference Unsar reference Date Off. Ser.No. YourHef. Our Ref. Dato 2803 659 May 16, 1983 H / W Title: Electric motor-driven impact drill claims 1. Electric motor-driven hammer drill with an axially displaceable output shaft (5), which carries a detent disc (9), which is fixed to the housing in hammer drilling operation Counter-locking disc (10) cooperates and with a switching device (11) through which the Drilling operation, the axial displaceability of the output shaft (5) to keep the detent disks out of engagement (9 and 10) is limited, the switching device (11) in the area of the spindle neck (7) a switching ring (24) surrounding this neck (7) Postal check account Stuttgart 507 71 ^ 705 (BL * Zeqoio0 7oj-Drea | lneriBaril <'atuUQart 191ΘΒ54 (BLZ 600 80000) Il 111 has, / by means of which an axial bearing carrier (13) can be moved axially between its drilling position and the hammer drilling position by rotation, characterized in that a support disc (12) is provided fixed to the housing at least in the axial direction, via which the axial bearing carrier (13) is supported and that at least one axial projection (15; and an adapted axial recess (14) on the support disc (12) or on the axial bearing carrier (13) are provided through which, depending on the relative rotational position of the supporting disk (12) and the axial bearing carrier (13) over the Axial bearings (8), the detent disks (9, 10) are held out of engagement (drilling position) or can come into engagement with one another (impact drilling position). 2. Impact drill according to claim 1, characterized characterized in that for rotational adjustment of the support disc (12) or the axial bearing carrier (13) an m4-t of the support disc (12) or the Axial bearing carrier (13) connected rotary lever ι (18J through the housing (1) to the switch ring (24) is performed. 28Ö3 659 ^4th β Au · I «Y 4YY» · »·» ■ · ■ «// ϊ , · ' \ : Ί * ί U ί / in 1 I t I I I ♦ * · «·. * 3 - * Whip bean machine according to claim 2 , characterized in that the rotary lever (18) is a flat stamped part which is penetrated in an opening by the cylindrical axial bearing support (13) and is coupled to it in the direction of rotation. 4. Impact drill according to claim 3, characterized characterized in that the rotary lever (18) has at least one inwardly projecting nose (17), in a longitudinal groove (16) of the axial bearing carrier (13) intervenes. 5. Impact drill according to claim 3 or 4, characterized in that the end or ends (22) of the rotary lever (18) in each case one Recess (23) of the Schalfcrings (24) are received, the ends (22) in openings (21) protrude through the spindle neck (7). 6. Impact drill according to claim 2, characterized characterized in that the support disc (12) penetrated by the output shaft (5) is symmetrical 2803 659 has two projections (15) and the axial bearing (13) corresponding to two axial recesses (14), whereby the projections (15) Vorzugswelse are formed by embossing and the two axial recesses (14) through a deep, continuous groove. 7 * Impact drill according to one of the claims to 6 / characterized in that the switching ring (24) in an at least partially circumferential Groove (25) of the spindle neck (7) by at least one circumferential one locked there Projection (26) or latched projections (26) distributed around the circumference is rotatably guided. 8. Impact drill according to · Claim 1 or 2, characterized in / that the support disc (12) in matching groove-like recesses between the two housing halves in a form-fitting manner easy to insert during assembly. 9. Impact drill according to claim 7, characterized in that the snap-in projections (26) of the switching ring (24) are arranged at the end of a resilient tongue (27). 2803 10. Impact drill according to claim 7 or 9, characterized in that the switching ring (24) can be locked in its working positions "drilling" and "hammer drilling" / these Latching by overcoming the latching resistance can be overcome in the direction of rotation. 11. Impact drill according to claim 10, characterized in that the groove (25) in the region of the displacement path of at least one projection (26) has two recesses (25 ¹ , 25 ") in which the projection (26) in the Drilling position and sitting in the percussion drilling position and when turning between these two working positions, the locking resistance is caused by the swish increase (28) between the recesses (25 ', 25 ") and the resilient flexibility of the projection (26) when the switching ring (24) is rotated . - End of claims - 2803 659 ■ * · ■