A FLANGE FORMING DRILL MEANS

Abstract: A flange forming drill means for drilling a hole through the side of a pipe or the like and for forming a hole encircling flange. The drill means is provided with a drill rod (1) mountable on a rotating machine and fitted with a drill bit (4) and associated forming members (3) which, after the hole has been drilled, can be extended down below the edges of the hole by turning an adjustment member (2) fitted around the drill rod. The adjustment member (2) is enclosed in an externally smooth protective shield (7), which is in engagement (8, 9) with the adjustment member (2), so that their relative rotation around the drilling axis is eliminated. To the drill rod (1) is secured a locking means (16) to which the shield (7) and adjustment member (2) can be removably locked in various angular positions around the drilling axis. The locking means comprises a locking flange (16) provided with two holes or recesses (17, 18) defining the terminal positions of locking. In the first terminal locking position the forming means (3) lie completely within the outer face of the drill bit (4) and in the second terminal locking position the forming means (3) extend or project from the drill bit (4) so as to correspond to the desired internal diameter of the flange (11).

Description: A flange fo.rming drill means The present invention relates to a flange forming drill means for drilling a hole through the side of a pipe or the like and dor forming a flange, which encircles the hole, said means comprising a drill rod which is to be mounted on a rotating machine and fitted with a drill bit and associated forming means which, after the hole has been drilled, can be extended down below the hole edges by turning an adjustment member turnably mounted around the drill rod. Such a flange forming drill means is disclosed in US patent 3 592 038. That apparatus has proven itself very useful when a flanged hole is to be formed on the side of pipe e.g. for the connection of a branch pipe. For locking the forming members either in the extended flange forming position or in the retracted hole drilling position, it is necessary that the adjustment member can be locked in various angular positions around the drilling axis. For this purpose the Finnish patent publication 50843 discloses a locking means, which can b≤ manually pressed in radial direction thus releasing the locking for manual screwing of the adjustment member. However, such a device is inconvenient to use since one hand must perform two simultaneous crosswise actuating movements, namely pressing the lock in radial direction and turning the adjustment cone 90 . In addition to this inconvenience, the lock means and top ends of the forming pins produce a safety risk, since they project from the adjustment cone and rotate therealong. There is an apparent safety risk, a possibility of injuring the fingers in the forming pins or lock, when the adjustment cone is gripped for the adjustment and the current is accidentally switched on the drill. The risk also exists if the adjustment cone is gripped dura ng so-called post-running of the drill . The object of the invention is to improve said type of drill means, so that said operating trouble and safety risks are overcome . OMPI Λ. WIPO <v For this purpose the invention is characterized in that the adjustment member is externally enclosed in a smooth protective shield which is engaged with the adjustment member so that they cannot rotate with respect to each other around the drilling axis, and the drill rod is fitted with a locking member to which the shield and adjustment member can be removably locked in various angular positions around the drilling axis. Thus, the locking can be released e.g. by lifting the shield upwards. This can be achieved by using elements secured to th frame of the drill means, said frame comprising e.g. support legs, which engage the work piece, said elements, after the drilling operation with the drill means being further pressed downwards, leaning against the lower surface of the protectiv shield thus lifting the shield upwards. The friction force acting between the support elements and the shield turns simultaneously the shield and the adjustment member resulting in the extension of the forming means down below the edges of the hole. Thus, the operation can be automated. A preferred embodiment of the invention is described in more detail in the following specification with reference made to the accompanying drawings, in which : fig. 1 shows the device of the invention in vertical section, fig. 2 is a plan view of a locking flange which is a part of the invention, and fig. 3 is a sectional view taken along the line III-III of figure 1. The drill means comprises a drill rod 1 which can be mounted on a rotating machine and whose lower end comprises a drill bit 4. Around the rod 1 is fitted an adjustment device 2 whos conical lower face has helically pitching guide grooves 5, which receive the gripping extensions 6 at the upper ends of ( Oϊ.lPI _ the forming pins 3. The forming pins 3 extend crosswise in the bores running through the drill rod 1 and drill bit 4 and, by turning the adjustment cone 2 said pins can be extended a .. predetermined distance outside the drill bit 4 jacket or they can be completely retracted within the jacket surface of the drill bit 4. In the latter position the bit 4 is used for drilling a hole through the surface of a pipe 10 and in the former position, i.e. the forming pins 3 extended, a collar flange -11 can be formed by pulling the rotating drill means up from the hole. According to the invention, the adjustment cone 2 as well as the upper ends of the pins 3 are enclosed within an externally smooth protective shield 7. A lug 9 fixed on the internal surface of the shield 7 is engaged with a recess 8 in the rim of the adjustment cone 2, which is how their relative rotation around the drilling axis is eliminated. Thus, the adjustment cone 2 turns by turning the protective shield 7. The top of the shield 7 is closed with an externally smooth cover 12 mounted with screws 13 on the bent edge 14 of the shield,7. From the lower face of the cover 12 projects an engagement pin 15 secured to the cover and in engagement with -a. hole 17 in the locking flange 16. Thus, the forming pins 3 are in the extended position. The locking flange 16 is rigidly secured to the shaft 1 and has also another hole 18 (fig. 2) at a certain angle from the hole 17. Between the holes 17 and 18 extends a groove 19 in which the end of pin 15 can run between its terminal positions defined by the holes 17 and 18. A spring plate 20 urges the cover 12 together with the shield 7 down¬ wards, so that the pin 15 cannot get loose from the hole 17 or 18 by itselt. When the forming pins 3 are to be moved from the extended position, presented by the solid line, to the retracted position, shown by the broken lines, the shield 7 is lifted upwards whereby the end of the pin 15 is released from the hole 17 and the shield is turned until the end of the pin 15 reaches the hole 18. In the opposite direction this can be done with the drill means rotating and all there must be done is to lift the shield 7, whereby a friction force applied OMPI Λ. WIPO - thereto automatically effects the turning movement from one position to the other. The operation can be automated in such a manner that stopper elements 22 are secured to supporting legs 21 connected with the rotating machine body, which elements, after the hole has been drilled and the drill means is being urged downwards, respond to the conical lower face of the shield 7 and simultaneously effect the uplifting of the shield 7 or release of the locking and also, by the actio of the friction, the deceleration of its rotational speed as compared to the drill rod 1 and to the locking flange secured thereto, whereby the forming pins 3 extend out. down below the hole edges.-In practice, this happens immediately after the hole is drilled through and the face of the shield 7 impinges against the elements 22. The relative axial movement between shield 7 and rod 1 can also be utilized for further automatio of the operation in such a way that the upward movement of th shield 7 relative to the shaft 1 and to the rotating machine body acts on an actuator which switches on an auger screw whi pulls the drill means upwards. Therefore, all the operator ha to do is to actuate the machine and press the hole, the machi will automatically take care of the extension of the forming pins 3 and the initiation of the return feed. As can be seen, the adjustment cone 2 can be locked on the drill rod 1 by means of a shield 7, cover 12 and locking flan 16. Thus, there is such a special feature to the invention that, by loosening screws 13 and by turning the protective shield 14 and cover 12 relative to each other, it is possible to adjust the distance which the forming pins 3 are extended in one terminal locking position with the pin 15 in the hole 17. Thus, it is possible to set any desired diameter for the flange 11 in the device. If desired, it is naturally possible to make intermediate holes in the groove 19 between the terminal holes 17 and 18 for various flange dimensions. The possibility of turning the sections 7 and 12 relative to each other is particularly intended for adjustment of the toleranc of a predetermined flange dimension, whereby the boundary poi 23 between the section 7 and 12 can be provided with a nonius type of scale. f O PI

Claims: Claims 1. A flange forming drill means -for ■ drilling a hole through the side of a pipe or the like and for forming a hole encircling flange, said means being provided with a drill rod (1) mo ntable on a rotating machine and fitted with a drill bit (4) and accociated forming members (3) which, after the hole has been drilled, can be extended down below the edges of the hole by turning an adjustment member (2) fitted around the drill rod, c h a r a c t e r i z e d in that the adjustment member (2) is enclosed in an externally smooth protective shield (7), which is in engagement (8, 9) with the adjustment member (2) , so that their relative rotation around the drilling axis is eliminated, and that to the drill rod (1) is secured a locking means (16) to which the shield (7) and adjustment member (2) can be removably locked in various angular positions around the drilling axis. 2. A flange forming drill means according to claim 1, c h a r a c t e r i z e d in that the locking means comprises a locking flange (16) provided with two holes or recesses (17, 18) defining the terminal positions of locking, arid that in the first terminal locking position the forming means (3) lie completely within the outer face of the drill bit (4) and in the second terminal locking position the forming means (3) extend or project from the drill bit (4) so as to correspond to the desired internal diameter of the flange (11) . 3. A flange forming drill means according to claim 1, c h a r a c t e r i z e d in that locking can be released by lifting the shield (7) upwards. 4. A flange forming drill means according to claims 2 and 3, c h a r a c t e r i z e d in that the first and second terminal position of locking are so selected that, during uplifting of the shield (7) rotating in the drilling direction, the frictional force applied thereto turns , after the locking is released, the shield (7) tcgether with its adjustment member OMPI Λ. WIPO - (2) from the first terminal locking position to the other. 5. A flange forming drill means according to cl'aim 2, c h a r a c t e r i z e d in that the shield (7) is topped with an externally smooth cover (12) whose lower surface is provided with a projecting engagement pin (15) , which cooperates with locking holes (17, 18) made on the locking flange (16) and defining the terminal positions of locking, 6. A flange forming drill means according to claim 5, c h a r a c t e r i z e d in that the cover (12) and shield (7) can be mounted (13, 14) on each other in various relative angular positions around the drilling axis. 7. A flange forming drill means according to claim 1, c h a r a c t e r i z e d in that the internal face of the shield (7) is provided with a lug (9) received in a recess (8) in the rim of the conically-shaped adjustment member (2) . 8. A flange forming drill means according to claim 1, c h a r a c t e r i z e d in that the shield (7) has partly frusto-conical and partly cylindrical jacket surface. 9. A flange forming drill means according to claim 4, c h a r a c t e r i z e d in that supporting legs (21) of the drill means are provided with stopper elements (22) again which the shield (7) impinges when the drill is urged down¬ wards and which effect the uplifting of the shield (7) and by frictional action decelerate it with respect to the rotating drill rod (1) , whereby the locking shifts from the first terminal position to the other. O PI Λ, IPO

Inventors: LARIKKA L
Applicants: LARIKKA L, SERLACHIUS OY, SERLACHIUS OY G A
Application year: 1981
Main classification: B21C37
IPC codes: B21C37, B21D19