FR2703289A3 - Electric perforator. - Google Patents

Abstract

a) The invention relates to an electric perforator. b) Electric perforator characterized in that the locking sleeve (23) comprises at its outer edge cavities passing radially and axially directed inwardly, the number and distribution of which at the periphery of the locking sleeve (23) corresponds to that of the receiving grooves (22) of the tool holder (11). The bush (23) is connected in the peripheral direction by a form connection with the tool holder (11). The cavities are formed substantially in the middle between the grooves (22) to achieve automatic locking and without incident of the hooking device (18).

Description

"I Electric punch" State of the art: The invention relates to a

  electric perforator including hammer-punch comprising a percussion mechanism surrounded by a housing and having a tool holder rotatable relative to the housing and to be locked in one of the different attachment positions, this tool holder penetrating with its end turned towards

  the percussion mechanism in a cy-

  hollow cylindrical formed or rigidly connected to the housing and coupled thereto by a fastening device having at least two locking members housed with radial clearance in a radial passageway formed in the receiving flange and which for the catching takes in grooves of

  intended reception at the outer periphery of the door-

  tools, at least this locking member being maintained

  in the receiving grooves by a bushing of

  axially slidable ratchet comprising a receiving flange, said sleeve being biased axially in the locking direction and the locking sleeve is connected by a connection in the form

  in the peripheral direction with the tool holder.

  Such punches are known having a tool holder that can lock in several

  locking positions and which can be rotated by

  port to the housing around the axis of the tool Such carriers

  tools that can be turned or blocked are inte-

  especially when used as

  buckets because the tool can then position itself in

different working positions.

  A commercially known perforator comprises for this a receiving flange coupled to the tool holder by means of a hooking device. The receiving flange comprises radial passages, in which a plurality of locking members are held with

  radial clearance With regard to the passages, the tool holder com-

  carries a number of receiving grooves in which

  locks to secure the lock.

  A locking sleeve keeps in the direction of

  the locking elements in their groove

  ception The locking sleeve is coupled by a shape connection in the circumferential direction with the tool holder and is subjected to the action of a spring in the

lock direction.

  To rotate the tool holder relative to the housing, the locking sleeve is moved against the force of the spring until it releases the locking members so that when they are rotated, they can be pushed radially towards the housing. outside in the passages through the flanks of the receiving grooves to release

these last.

  To hang the tool holder in another angular position, it must be turned until the

  locking elements are located on the grooves

  ception If at this moment the bushing is released

  rust, it slides over the locking members under the effect of the spring and pushes them into the receiving grooves thus locking the fastening device. On the other hand, if the locking sleeve is released for a rotational position of the tool holder for which the locking members are not found

  precisely above the receiving grooves, the ver-

  In the most unfavorable cases, the locking sleeve can even seize on the locking members,

  which is particularly troublesome because it is impossible

to change tools.

  Advantages of the invention The object of the present invention is to remedy these drawbacks and concerns for this purpose a perforator of the type defined above, characterized in that the bushing of

  lock has in its axially intended outer edge-

  to cooperate with the locking member, cavities

  radially inwardly and which are directed axially inwards, and whose number and distribution at the periphery of the locking sleeve correspond to the number and distribution of the receiving grooves at the periphery of the tool holder, the cavities being provided each time substantially superimposed in the middle of the grooves

corresponding reception.

  The perforator according to the invention offers the advantage

  that the hooking device is automatically

  any position of rotation of the tool holder; it also emerges without difficulty from a position of

  rotation for which the locking members do not se-

  not above the receiving grooves.

  According to other advantageous features the outer edge of the locking sleeve

(23) has a corrugated profile.

  the cavities have a parabolic or arcuate shape. at least one locking member is in the form of a ball

  the residual sections of the lampholder

  rust located between the neighboring cavities are decreasing

  nuant in the locking direction and form spikes.

  the spikes are provided each time sensitive-

  in the middle between two adjacent receiving grooves.

  the tips are slightly rounded. cavities or residual sections have a

  form comparable to saw teeth.

  the planned form connection between the tool holder

  and the locking sleeve is made using languet-

  provided on the collar of the locking sleeve directed radially inwards and coming into

  the longitudinal grooves of the tool holder.

  the tabs move away from the bushing

  rust in the axial direction and present a tran-

rounded position towards the collar.

  Drawings An exemplary embodiment of the invention is shown in the drawings and will be described in more detail below: FIG. 1 is a longitudinal section of the tool holder

a perforator according to the invention.

  FIG. 2 is a plan view of the lampholder

rusting according to the invention.

  Description of the exemplary embodiment

  Figure 1 shows only the mandrel 10

  of an electric percussion drill, known, This man-

  Drin 10 comprises a hollow cylindrical tool holder 11 in which the tail 10 of a tool can be engaged axially, as is known, for locking it with two rollers 13. The tool holder is projecting through its end 14 facing the mechanism. perforator percussion, (also

  not shown because known), in a receiver flange

  hollow cylindrical shape, of corresponding shape.

  The receiving flange 15 is either formed by a

  perforator housing which surrounds the percussion mechanism

  it is a rigid part of the housing. The tool holder 11 and the receiving flange 15 are coupled together.

  in the peripheral direction by a device for

  chage 18 The attachment device 18 comprises at least one locking member 19 In the embodiment example

  of Figure 1, a total of four

  rust for example in the form of balls which are each time offset 900 and only two are represented

sectional.

  The receiving flange 15 has passages

  radially directed and which receive the organs of ver-

  rusting 19 mobile radially outer periphery

  21 of the tool holder It comes to take in the flange of re-

  ception 15 has a plurality of receiving grooves 22 in

  which are the locking members 19

  Locking lugs 19 are held by a locking sleeve 23 surrounding the front portion of the receiving flange 15 in the receiving grooves 22 and in the passages 20 of the receiving flange 15 to connect the

  "O tool holder it integrally rotated with the outer flange

  15 and thus with the housing of the perforator In the embodiment of Figure 1, there are twelve in all

  receiving grooves 22 distributed regularly over the period

  1 hour of the tool holder thus allowing to hang the tool holder He following steps with 300 compared to the

receiving flange 15.

  The locking sleeve 23 is biased axially in the locking direction by a spring

  The compression spring 24 comes

  to do this with the lugs 25 secured to the locking sleeve 23 The compression spring 24 is supported by its other end against the front part of the mandrel On the opposite side to the locking members 19, the

  locking sleeve 23 has a flange 26

  This collar is radially inward

  A number of tabs 26a facing inwards and coming into the corresponding longitudinal grooves 27 of the tool holder 11 to connect the locking sleeve 23 in the peripheral direction, by a connection in the form of the tool holder it while being able to axial slide-

  in the longitudinal grooves 27 When the installation

  8 is locked, the flange 26 pushes the locking sleeve 23 against the end

before the receiving flange 15.

  An operating ring 28 slides the locking sleeve 23 against the spring force

  24 The operating ring 28 acts for this purpose on patches

  25 are provided on the opposite side of the spring 24 and drive the lugs 25 by a shape-connection in the circumferential direction so that rotation of the operating ring 28 in the circumferential direction causes rotation

  corresponding to the locking sleeve 23; the lan-

  spacers 26a also drive the tool carrier 11

  that the attachment device 18 is locked, a

  flange 29 made on the receiving flange 15

  said to move the operating ring 28 towards the

percussion mechanism.

  To unlock the verve device

  18, the operating sleeve 28 is slid into di-

  rection of the tool until it radially releases the locking members 19 If the mandrel

  or the tool holder are turned relative to the housing

  or the pressure flange 15, the flanks delimiting the receiving grooves 22 in the peripheral direction

  cause the locking member 19 to be pushed radially

  The tool holder 11 can then turn about the axis 30 of the tool since it is then released relative to the flange.

  The locking members 19 are retained

  bare so as not to escape radially through the ring of

work 28.

  Figure 2 shows the locking sleeve 23

  according to the invention, the periphery of which comprises in all four

  With the tabs facing away from the tool, the locking bush 23 is provided with an inwardly directed radial flange 26 provided with tongues 26a directed inwards and which engage in

  the longitudinal grooves 27 already described (Figure 1).

  The tabs 26a have a transition 26b rounded towards the collar 26 and extend in the axial direction away from the locking sleeve 23, which reduces

  the wear caused by the sliding of the bushing

  rusting 23 in the longitudinal groove 27.

  The locking sleeve 23 has an edge

  32, axial to cooperate with the ver-

  rusting 19 (Figure 1); this outer edge is slightly corrugated in the peripheral direction The outer edge 32 has cavities 33 continuous, radially and facing inwards; these cavities have a shape substantially

  parabolic or arcuate The number and distribution

  cavities 33 correspond to the number and the

  provision of the receiving grooves 22 provided on the periphery

  21 of the tool holder 11 The cavities 33 are preferably

  seen to be substantially in the middle above the corresponding receiving grooves 22 The corrugated pattern of the outer edge 32 with the rounded cavities 33 allows automatic locking of the locking device 18 even from a rotational position in which

  the locking members 19 are not exactly

  above the receiving grooves 22.

  When the operating ring 28 is released from this position, the locking sleeve 23 is pushed eccentrically into the cavities 33, for example in a zone 34 of the outer edge 32, against the locking members 19. thus divides on the ball-shaped locking members 19 into an axial component and a component which induces a rotational movement in the locking sleeve 23 and thus in the tool holder 11 The rotational movement allows

  locking members 19 to penetrate the cavities

  33 until it is substantially in the middle in the

  cavities 33 As the locking members 19 are

  then wind above the receiving grooves 22 of the carrier

  11 tools, the locking members 19 can take

  in the receiving grooves 22 and the lampholder

  rust 23 then slides over the glass organ

rusting 19 by action of the spring.

  Between neighboring cavities 33 there is each time a residual section 35 of the locking sleeve 23

  which is decreasing each time in the direction of ver-

  rusting The residual sections 35 form spikes

  36 which are substantially in the middle between the grooves

reception 22.

  In exceptional cases, the bushing

  rust 33 and the tips 36 can meet the

  Spherical latching means 19 in such a manner that the latching device 18 can not lock. The jolts acting on the spike such as those occurring during the piercing operation, the locking mechanism described above can then be engage in the attachment device 18 In this case, the tips 36 slightly rounded, without burr, further facilitate

  hanging Cavities 33 or residual sections 35 can

  also have a shape closest to

  That of teeth It is clear that the invention is not

  equipped in its application to perforators but is suitable for example also for hammer-drills with

  rotational drive of the tool holder.

  Locking members are not necessary

  as spherical as in the exemplary embodiment

  can also consider, for example,

  cylindrical rust provided axially or radially in the receiving groove 22 For functional reasons, the locking elements must be rounded

  at their end facing the lamina

  rust 23 and their penetrating surface into the groove

reception 22.

  The realization of the connection by the form between the tool holder 11 and the locking sleeve 23 is not limited to the shape given to the tabs 26 in

  the embodiment of the collar oriented towards the in-

  may also have turned tongues

  outward and that would take in long grooves

  longitudinal 27 to transmit the rotational movement.

Claims (4)

R E V E N D I C A T IO N S   1) Electric perforator including hammer-   perforator having a percussion mechanism surrounded by a housing and having a tool holder rotatable relative to the housing and being locked in one   different mounting positions, this tool holder weighs   with its end facing the percussion mechanism in a hollow cylindrical receiving flange   formed or rigidly connected to the housing and coupled to that   ci by an attachment device having at least two orga-   locks housed with radial clearance in a   radially realized in the receiving flange and which for catching takes in receiving grooves provided at the outer periphery of the tool holder, at least this locking member being maintained in the   receiving grooves by a common locking bush   axially smoothing and comprising a receiving flange, this sleeve being biased axially by a force   in the locking direction, and the lampholder   rust is connected by a connection by the shape in the peripheral direction with the tool holder, perforator   characterized in that the locking sleeve (23) comprises   door in its outer edge (32) provided axially to cooperate with the locking member (19), cavities   (33) passing radially axially towards the in-   and whose number and distribution at the   of the locking sleeve (23) correspond to the number and distribution of the receiving grooves (22) at the periphery (21) of the tool holder (11), the cavities (33)   being provided each time substantially superimposed in the middle   location of the corresponding receiving grooves (22).   A perforator according to claim 1, characterized   characterized in that the outer edge (32) of the   lock (23) has a corrugated profile. 11 2703289   A perforator according to claim 1, characterized   characterized in that the cavities (33) have a parabolic shape or in arc.   A perforator according to claim 1, characterized   characterized in that at least one locking member (19) is ball-shaped.    Perforator according to one of the claims   preceding, characterized in that the residual sections (35) of the locking sleeve (23) located between the neighboring cavities (33) are decreasing in the direction   locking and form tips (36).   6) Puncher according to claim 5, characterized   characterized in that the tips (36) are provided substantially at each middle between two receiving grooves (22) neighbors.   A perforator according to claim 5, characterized   characterized in that the tips (36) are slightly dies.   8) Perforator according to claim 5, characterized   in that the cavities (33) or the residual sections   the (35) have a shape comparable to saw teeth.   A perforator according to claim 1, characterized   in that the planned form connection between the holder   tools (11) and the locking sleeve (23) is provided by means of tabs (26 a) provided on the collar (26) of the locking sleeve (23) directed radially inwards and coming to grips with a binding by form   in the longitudinal grooves (27) of the tool holder (11).   A perforator according to claim 9, characterized   characterized in that the tabs (26a) deviate from the locking sleeve (23) in the axial direction and have a rounded transition (26b) to the flange (26).