FR2709260A1 - Hand drill including perforator. - Google Patents

Abstract

Tool holder combination drill for clamping or locking either round shank or grooved shank tools. Drill according to which the tool holder (13) provided with a mandrel constitutes a first tool receiving means (11) provided on the outer casing (16) of the hollow spindle (15); the end (17) of the hollow spindle (15) facing the tool holder (13) engages in the passage (14). Means are provided (36) for driving in rotation the grooved rod of a tool capable of being housed in the second receiving means (12). The tool holder (13) is a simple, untreated workpiece which avoids processing-related deformations and greatly improves the correct rotational characteristics about the axis.

Description

"Hand drill including perforator" State of the art

  The invention relates to a drill in particular

  drill having a combination of tool holders for rotary drilling tools, percussion drilling tools,

  percussion and screwing, this combination of

  tool having a first tool receiving means constructed as an adjustable jaw mandrel for receiving round rod tools and a second receiving means

  functionally separate from the first and

  carrying means for rotational and / or locking driving, for receiving grooved rod tools, and

  having a tool holder with a central hole, this holder

  tool being integrally connected in rotation to a hollow spindle capable of being rotated, spindle in which is located an axially movable percussion member, reciprocating, and acting

  directly on a tool placed in the second medium of

  tool ception for percussion operation.

  A drill (DE-41 04 131 Ai) is already known which has a combination of tool holders with two functionally distinct tool holders for round rod tools and rod tools provided with a groove. The two means for receiving the tools are made in a common tool holder of an expensive manufacture which comprises means for driving in rotation round rod tools and rod tools provided with a groove. Given

  the important mechanical constraints of the training means

  When the drill is working with a perforator, the tool holder must be treated, this platform leads to deformation of the material due to the geometry of the wall and adversely affects the characteristics of the tool.

  rotation of the drill, particularly during work

  with round wicks. To avoid distortion

  treatment, it has already been proposed to provide the toolholder treated inserts but it also requires

  expensive manufacturing work ..

  The present invention aims to remedy

  these disadvantages and concerns for this purpose a drill cor-

  corresponding to the type defined above characterized in that the tool holder is provided on the outer casing of the hollow spindle, one end of the hollow spindle facing the tool holder coming into the hole, and means of being provided for the grooved rod of a grooved rod tool capable of being engaged in

  the second tool receiving means.

  The drill according to the invention offers the advantage of being equipped with a combination of advantageous tool holder

  for its manufacture and which has excellent characteristics

  rotation on one axis. The tool holder of the

  it does not have to be treated; this avoids the deformation of the material or the inconvenience that the drill may not

  not to receive by mistake of treated insert.

  According to other advantageous features of the invention: the locking means of the grooved rod tools comprise a substantially cylindrical fastening rod with a rounded, hemispherical front portion and which is slidably housed in a bore passing through the door wall; tool and which, in its locking position, comes to take with its front part through an opening

  the wall of the hollow spindle in a groove of

  raking performed in the grooved rod tool, the rod

  which can be put in its position of ver-

  by an axially sliding locking element which is urged by the force of a closing spring to be released only by sliding

  the locking element against the spring force.

  It is particularly advantageous that the locking pin is urged by a compression spring

  in the unlocking direction which allows a release

  safe ratcheting when the groove tool is engaged.

  A long recovery with a weak

  clearance between the hollow spindle and the tool holder allows

  to a positioning accuracy of the tool holder on the hollow spindle, which also improves the non-off-center rotation characteristics of the drill and its tool

tight between the bit.

  Thanks to the cavities for the jaws at the end of the hollow spindle, the overlap is effectively prolonged

  between the hollow spindle and the tool holder.

  By reducing the hollow spindle to a minimum wall thickness (m) treatment-induced cracks are avoided

  and deformation when treating the hollow spindle.

  The possibility of blocking the jaws, when the drill works in percussion, avoids any closing or

automatic gripping of the jaws.

  Drawings Embodiments of the invention are shown in the drawings and will be described hereinafter in more detail. So:

  - Figure 1 shows in partial section a first

  first exemplary embodiment, a perforator provided with a

  combination of tool holder that squeezes by hand.

  - Figure 2 is a section of the part of a

  hollow pin of the perforator, on the side of the tool.

  - Figures 3 and 4 show respectively a

  cut of a jaw blocking device.

  --la.figure - 5 shows-a - second-example-of-rali ------ sation of a perforator with a combination of tool holder which is tightened with a key, and in which is fixed a tool

with round stem.

  - Figure 6 shows this drill with a tool

with groove.

  Description of the embodiments

  A perforator shown in FIG. 2 comprises a housing 1 housing a motor not shown as well as a percussion mechanism 2. The percussion mechanism 2 is

  represented by a striking member 20 on which a percussion

  3 in the axial direction. The striker 3 is

  born in the axial direction following a movement

  alternative, in some way for example by

  air cushion or spring striking mechanism. The striker 3 and the percussion member 20 are housed inside a hollow spindle 15 which can rotate

  relative to the housing 1. The hollow spindle 15 which is

  made of treated steel because of the strong constraints

  which it is subjected, is rotated by a

drive gear 4.

  At its end 17 opposite that of the mechanism

  of percussion 2, the inside of the hollow spindle 15

  A reduction in section serves as a stop 5 for the percussion member 20, preventing it from falling off the hollow spindle 15. By its end 17, the

  hollow spindle 15 protrudes from the housing 1 and carries at its

  The tool holder 13 is provided with a first tool receiving means 11 for receiving round rod tools 42 (FIG. 5). Second tool receiving means 12 operably separated from the first means for receiving tools having a groove pin 43 (Fig. 6); this second means is partly inside the hollow spindle 15 and partly on the tool holder 13. The guide and the rotational drive of the rod tools provided with groove 43 and set up is in the spindle hollow 15; the forward axial restraint is provided by locking means provided

  on the tool holder 13. The first means of receiving

  11 and the second tool receiving means 12 form

  a combination of tool holder 10 of the drill.

  The first tool receiving means 11 is

  known in the form of a mandrel tight to the

  hand. In the tool holder 13 of the carrier combination

  tool 10, there are three guide paths 48 diagonally, which join forward to receive three jaws 41, mobile. The jaws 41 are usually provided with teeth that allow them to move in the paths

  48 by means of a threaded ring 45. The ring

  letée 45 is integrally connected in rotation to a clamping sleeve 48 and can turn by hand with this sleeve. With regard to this, the combination of tool holder shown in FIGS. 5 and 6, comprises a toothed ring gear 45 a, which can be adjusted in a known manner with the aid of a wrench.

  mandrel. The other identical or similar parts

  the drawings bear the same references.

  The tool holder 13 is mounted on the end 17 of

  the hollow spindle 15. A through hole 14, central pre-

  the tool holder 13 has an inside diameter large enough for the tool holder 13 to be mounted with as little radial clearance as possible and

  long overlap on the outer shell 16 of the broach

  digs 15, concentrically with it. At least one

  rods 40 housed in a radial bore 22 fixes the holder

  tool 13 and the hollow spindle 15 relative to each other in the peripheral direction and in the axial direction, forward, by a form connection. The rear end

  of the tool holder 13, turned towards the hollow spindle 15,

  Thus, axially on an outer shoulder 6 of the hollow spindle 15. The rod 40 can not fall from the percussion member 20, inwardly directed by means of an actuating sleeve 30, sliding axially. The rod 40 takes in an axial groove 21 provided in the operating sleeve 30, thus avoiding that the

  bushing 30 is not wrongly turned in the direction

periphery.

  The grooved rod tools 43 (FIG. 6) are secured with the second tool receiving means 12 (FIG. 6). The reception of the grooved tool 43 is then inside the hollow spindle 15 with a very small radial clearance. On the inner wall of the hollow spindle 15,

  level of the end 17, there is at least one organ of

  trailing 36 shaped ribs for training

  in rotation and which, to transmit the rotation movement

  grooved rod tool 43 housed in the second tool receiving means 12, comes into a groove

  rotating drive 37 performed in the tool.

  The attachment or axial retention forward while maintaining axial mobility of the groove tool 43 engaged in the hollow spindle 15 is made using means made on the tool holder 13 for locking. These means comprise a latching rod 24 (FIG. 1)

  sliding in the radial direction and housed in a

  receiving ejection 25 provided in the tool holder 13, being directed inwardly biased. The bore 25 has a radial axis 29 inclined toward the rear portion of the perforator and intersecting the longitudinal axis 35 of the perforator at an acute angle. At its front end 36, the attachment rod 24 is rounded in a hemispherical shape. When the attachment rod 24 occupies the locking position of

  FIG. 6, the front part 26 comes to take in a

  23 in the hollow spindle 15 (see also FIG.

  2) to penetrate inside the hollow spindle 15. When the grooved body tool 43 is engaged, the latch rod 24 takes a locking groove 44 made in this rod and locks or thus retains the grooved rod tool 43, forwards all

  by allowing it limited axial sliding. Towards

  the possibility of axial sliding of the grooved rod tool 43, set up is limited by the

percussion 20.

  The attachment rod 24 is held in this position by a locking element 28 (FIG. 1) which is pushed in the locking direction by a closing spring 27. The locking element 28 is of a shape

  annular and acts with a protrusion 31 on the rod of

  24. The locking element 28 can slide with the operating sleeve 30 against the force of the closing spring 27 which leads the fastening rod 24 out of position.

  its locking position. To facilitate the release

  raking of the attachment rod 24, this rod is

  quoted by a compression spring 32 bearing on the one hand on a shoulder 33 provided on the tool holder 13 inside the receiving bore 25 and on the other hand on an annular flange 34 provided on the rod of 24. The force developed by the compression spring 32 is less than that of the closing spring 27 so that

  the compression spring 32 can be bandaged by the res-

  closing fate 37 when the attachment rod 24 is in

  lock position. After release of the stem of

  hooking 24 by the locking element 28, the compression spring 32 automatically pushes the fastening rod 24 in the unlocking position 38 shown in phantom in FIG. 1; we can then extract

  a grooved rod tool 43, engaged to the second means of repairing

tool ception 12.

  In percussion mode, the grooved rod tool 43 is urged directly by the percussion member 20, the jaws 41 of the first tool receiving means being

  in the open position and the tool 43 being able to slide

  compared to the bit 41. The combination of

  The tool 10 shown in FIG. 1 is equipped with a jaw blocking device 52 shown in greater detail in FIGS. 3 and 4. The jaw blocking device 52 comprises

  an annular body 50, split, provided in an annular groove

  49 in the tool holder 13. This annular body

  The wire 50 can be moved aside because of its slot and be preloaded inwards. The annular groove 49 is

  carried out sufficiently deep in the door-

  tool 13 so that at the level of the guideways 48 of the jaws 41 this groove completely through the wall of the tool holder 13 so that the annular member 50 rests on

  the jaws 41. In the front part of the jaws 41, there is

  that times at least one attachment groove 51 in which

  the annular member 50 can catch.

  Figure 3 shows the jaw blocking device 52 in the open position; in this position the jaws 51 have been slid inward towards a tool shank to be clamped. The annular body 50 then rests against the outer surface of the jaws 51 and is prestressed inwards. When the jaws 41 are slightly offset

  backwards from the position shown at the end

  gure 3, towards the position of the opening of the man-

  drin, the annular member 50 clings due to its preload in the latching grooves 51 since the jaws 41 are in the open position. The jaws 41 are

  thus maintained against any closure or continuation of

  verture, automatically (Figure 4). The annular groove

  49 may, as shown in the drawings,

  go decreasing radially inwards.

  The jaw blocking device 52 must avoid

  that the jaws 41 do not move in the operating mode

  percussion, in the case of drills equipped with manual chuck, and for which the jaws 41 slide easily. Closing the jaws 41 could limit the axial mobility of the grooved shaft tool 43

  housed in the second tool receiving means 2 and absorbing

  ber percussion effect. Moreover, the jaws 41

  should be open enough for their position

  of maximum opening they would seize with the thin ring

  45 and could not be closed by hand.

  FIG. 2 shows in more detail the front part of the hollow spindle 15. The diminished outer casing 16, which receives the tool holder 13 is sufficiently

  long to allow for as much overlap as possible

  sible; this is expressed by the ratio of the length [l] of

  the part of the hollow spindle 15 penetrating into the holder

  tool 13 on the diameter [d] of the orifice 14 (overlap

  l / d). The precision of the mounting of the tool holder 13 on the broach

  Hollow growth increases with recovery and weak play; this increases the precision of rotation of the perforator. We

  happens to correct rotation characteristics at

  firing a recovery of the order of 2/1; in the example shown, this overlap corresponds to approximately 2.5 / 1. The realization of the cavities 47 at the end 17 of

  the hollow spindle 15 makes it possible to increase

  the effective part of the recovery. The cavities serve for the passage of the jaws 41 and extend here in the

  extension of guideways 48. The resident section

  dual-shaped between the cavities 47 and which forms protruding portions 53 in tongue, for the hollow spindle 15 is also active as bearing surface for the tool holder

  13. In addition to the projecting parts 53, we have the

  rotational drive shaft 56 so that the axial distance between the first tool receiving means 11 and the

  second tool receiving means 12 is weak for a first

  a training unit 36 which at the same time is as long as possible. The inclined surfaces 55 provided at the end

  front of the hollow spindle 15, on the tool side, at the

  calf protruding parts 53, facilitate engagement

  a tool in the second tool receiving means 12.

  The enlargement 56 of the inside diameter of the spindle

  digs 15 as a result of the inclined input surfaces 55

  cilite the pre-centering of the grooved shaft tool 43

  that one introduces what because of the introductory race

  relatively long distance through port 14 of the

  tool 13 to the hollow spindle 15 is very advantageous. FIG. 2 shows the grooved rod 43, centered beforehand

  in the hollow spindle 15; we notice the inclined surfaces

  55 at the end of the tool side and which de-

  close in the extension 56 of the inner diameter. In

  turning the tool, we match the organ of

  56 and the rotating drive grooves 37 which allows to continue the introduction of the rod of

  the tool. The rotational driving member 36 is preferably

  gaily equipped at its end turned towards

  the tool, with an inclined surface 57.

  The tool shank can then slide further into the second tool receiving means 12 to

  it happens in support against the hanging rod 24.

  It is then pushed backwards at the same time

  that the locking element 28, against the force of the res-

  closing spell 27; the attachment rod 24 is pushed radially outwardly in the receiving bore and releases the inside of the hollow spindle 15. The tool can then be introduced further into the hollow spindle 15; the hooking rod 24 snaps into the locking groove 1l 44. The grooved rod tool 43 is then retained so as not to fall from the front of the receiving means

of tool 12.

  The combination of tool holder 10 according to the invention

  It can accommodate rotary drilling drills,

  percussion drill bits, and percussion tools.

  screwing and screwing. Circumstances of movement

  of the combination of tool holder 10 with tools

  grooved rod 43 is improved by its guiding and its

  rotational drag, directly into the hollow spindle; good rotational characteristics are achieved with round shank tools 42 thanks to the untreated tool holder 13. By avoiding thin partitions between the protruding portions 53 of the hollow spindle 15, cracks are avoided

  caused by the heat treatment as well as the defor-

  heat treatment of the hollow spindle 15. The

  section of wall that ends in a point at the level of

  47, radially, of the hollow spindle 15 is di-

  minuted to a minimum value [m]. For a perforator shown in FIGS. 5 and 6, the opening 14 has

  different diameters, the opening, 14 of the example of

  Figure 1 shows an inside diameter

  constant, without setback; this reduces the usable time

  The embodiment of the extension 56 in addition to the inclined entry surface 55 on the hollow spindle 15 can then be advantageous even in the case of a drill equipped only with a tool holder for

grooved rod tools 43.

Claims (12)

R E V E N D I C A T IO N S   1) Drilling machine including a perforator having a tool combination (10) for rotary drilling, hammer drilling, percussion and screwing tools, said tool holder combination (10) having a first tool receiving means (11) constructed as an adjustable jaw mandrel (41) for receiving round rod tools (42) and a second tool receiving means (12) operably separated from the first means and having means for rotation and / or locking drive, to receive grooved rod tools   (43), and having a tool holder (13) provided with a central opening   tral (14), this tool holder being integrally connected in rotation   a hollow spindle (15) which can be rotated, a spindle in which there is an axially movable percussion member (20) reciprocating and which acts directly on a tool placed in the second receiving means tool (12) for percussion operation, drill characterized in that the tool holder (13) is provided on the outer casing (16) of the hollow spindle (15), one end (17) of the spindle hollow (15) facing towards the tool holder (13) coming into the orifice (14), and drive means being provided for the   grooved rod (43) of a grooved rod tool (43)   tible to be engaged in the second means of receiving til (12).   2) Drill according to claim 1, characterized   in that the locking means of the rod tools   groove (43) comprise a fastening pin (24) substantially   substantially cylindrical with front part (26) rounded, semi-circular   spherical, and which is slidably housed in a bore (25) passing through the wall of the tool holder (13) and which, in its locking position, engages with its front portion (26) through an opening (23) of the wall of the hollow spindle (15) in a locking groove (44)   made in the grooved rod tool (43), the rod of ac-   stalling (24) which can be put in its green position   rusting by an axially sliding locking element (28) which is urged by the force of a closing spring (27) to be released only by sliding   of the locking element (28) against the force of spell (27).   3) Drill according to claim 1, characterized   in that the attachment rod (24) is biased by   a compression spring (32) which is tensioned in the   locking of the attachment rod (24) and tends to   put the attachment rod (24) after releasing the element   locking member (28) out of engagement with the groove of locking (44).   4) Drill according to claim 3, characterized   in that the compression spring (32) is supported by a   on a shoulder (33) provided in the receiving bore.   tion (25) and on the other hand against a collar (34) on the hook rod (24).   Drilling machine according to one of claims 2, 3   or 4, characterized in that the housing (25) has a radial axis (29) inclined towards the rear part of the drill so that its longitudinal axis (35) intersects the combination of   tool holder (10) at an acute angle.   6) Drill according to claim 1, characterized   in that the rotational drive means are embodied as rotational drive members   ribs (36) provided on the inner wall of the end   mité (17) of the hollow spindle (15) in the orifice (14) and   for housing in training grooves   tation (37) of a tool shank (43).   7) Drill according to claim 1, characterized   in that the tool holder (13) is fitted on the end   mity (17) of the hollow spindle (15) to be fixed by a shape connection in the circumferential direction and in the   axial direction by at least one rod (40).   9) Drill according to claim 8, characterized   characterized in that the ratio of the length [1] of the portion of the hollow spindle (15) into the tool holder (13) and the inside diameter [d] of the orifice (14) (overlap 1 / d ) is greater than 2.   Drill according to claim 1, characterized   in that the jaws (41) are accommodated in passages (48) of the tool holder (13) and the end (17) of the hollow spindle (15), in the extension of the passages (48) has a shape corresponding to the jaws {41) with cavities (47) in   radial bias for the passage of the jaws.   11) Drill according to claim 10, characterized   in that the cavities (47) at the end (17) are reduced to a minimum thickness (m) of the hollow spindle (15).   12) Drill according to claim 1, characterized   in that the jaws (41) are housed in the passages (48) made in the tool holder (13) and lock in   at least one opening position of the first tool holder (11).   13) Drill according to claim 12, characterized   characterized in that at the periphery of the tool holder (13) there is an annular groove (49) which slits the wall of the tool holder (13) at the passageways (48) in a slot-like manner   receives an annular member (50) which is subjected to a first   radially inwardly directed stress, and which for at least one open position is hooked into corresponding latching grooves (51) of the jaws (41).   14) Drill according to claim 13, characterized   in that the annular groove (49) decreases to the jaws (41).   Drill according to claim 1, characterized   characterized in that at the end of the hollow spindle (15) on the tool side there is an inclined inlet surface (55) which opens into an extension (56) of the inner diameter of the hollow spindle (55).   16) Drill tool holder, particularly for   drill, this tool holder (13) being capable of being   integrally rotatably connected to a driven hollow spindle (15) of the drill, and includes a mandrel-shaped tool holder (11) for receiving round rod tools (42) as well as functionally separate means   mandrel, for axially locking a grooved rod tool   (43), the tool holder (13) having a central passage (14), a tool holder characterized in that it (13) is integrally rotatably mounted on the outer casing (16)   of the hollow spindle (15) concentrically to that   and in that the passage opening (14) has an internal diameter   an interior sufficiently large so that when the tool holder (13) is fitted on the hollow spindle (15), a grooved rod tool (43) can traverse with radial clearance, the   through openings (14) engaged in one end.   mity (17) of the hollow spindle (15) and being locked there   while being able to perform limited axial sliding.