GB2389329A

GB2389329A - Bending head

Info

Publication number: GB2389329A
Application number: GB0213056A
Authority: GB
Inventors: Miroslav Krejcok; Ing Karel Vondracek
Original assignee: MSV Systems CZ sro
Current assignee: MSV Systems CZ sro
Priority date: 2001-02-28
Filing date: 2002-06-06
Publication date: 2003-12-10
Anticipated expiration: 2022-06-06
Also published as: DE10205789B4; CZ294987B6; GB0213056D0; DE10205789A1; GB2389329B; CZ2001747A3

Abstract

The invention relates to a bending head comprising a hollow pin (2) whose cavity contains a central pin (3) seated adjustably in axial direction but locked against turning around its longitudinal axis, fitted with a bending flange (4) and carrying a control bushing (5) adapted both to share the axial motion of the central pin (3) and to turn around the longitudinal axis of the central pin (3) and of the hollow pin (2), the control bushing (5) being coupled with a drive and carrying a bending body which is together with the bending flange (4) permanently situated in a plane normal (perpendicular) to the longitudinal axis of the central pin (3). The control bushing (5) and the central pin (3) are seated in and on the hollow pin (2) adjustably in the axial direction by a straight motion and the bending head comprises a fixing device of the central pin (3).

Description

a compression spring 552 situated between the pin 551 and the end side of

the !ongitudina! groove 55Q in the bending stone 55. The contra! bushing is in the axia! direction firmly coupled with the central pin 3 so that it shares the straight axial motion of the central pin 3 and of the bending flange 4 in relation to the hollow pin 2 in the direction of the longitudinal axis of the hollow pin 2 and of the central pin 3 when the bending means, that is the bending flange 4 and the bending body, move from their rest position to the bending plane and back. During the bending operation proper, the bending plane is normal to the longitudinal axis of the central pin 3 and passes through the centre of the shaped groove 40 of the bending flange 4 and of the shaped groove 501 of the bending body, i.e., through the area in which the not represented tube undergoes the bending operation. The control bushing 5 is rotatable in relation to the central pin 3 in the direction around the longitudinal axis of the central pin 3. During the rotary motion of the control bushing 5, the central pin 3, and consequently also the bending flange 4, are at rest (not moving) during the bending operation.

The rotary motion of the control bushing 5 around the longitudinal axis of the hollow pin 2 and of the central pin 3 is provided for by a drive coupled with the control bushing 5 and consisting in the shown embodiment of a hand lever 52 seated on the control bushing 5. During the rotary motion of the control bushing 5, the bending roller 51 eventually the pin 551 of the bending stone 55 moves in a circle around the axis of revolution of the control bushing 5 which coincides with the longitudinal axis of the hollow pin 2 and of the central pin 3.

The bending head is fitted with a stop device for setting the angular value of rotation of the control bushing 5 around the longitudinal axis of the hollow pin 2 and of the central pin 3, i.e., for defining the angle size of the bending produced by the motion of the bending body along the shaped groove 40 of the bending flange 4. In the shown example of embodiment, the stop device consists of a stop surface 53 arranged on the control bushing 5 and of a bar stop 54 adjustably arranged on the hollow pin 2. In a not illustrated example of embodiment, the stop device is made in another suitable manner, for instance by other suitable means which can be in the bending head design arranged in a similar or in a different way.

The bending head is fitted with a fixing device for fixing the axial position of the central pin 3 in the hollow pin 2 at least in the rest position or in the position in the

related bending plane. In the shown example of embodiment. the fixing device is situated at the other end of the contra! pin a, opposite the end of the contra! pin fitted with the bending flange 4, said other end comprising a fixing pin 6 radially adjustable in relation to the hollow pin and with its front end relatable to a pair of fixing holes 33 provided in the radial direction in the central pin 3. The position of one of the fixing holes 33 on the length of the central pin 3 determines the rest position of the bending means while the position of the other of the fixing holes 33 on the length of the central pin 3 determines the position of the bending means situated in the bending plane, see Figs. 1 to 4. In a not represented example of embodiment, the fixing means for fixing the axial position of the central pin 3 in the hollow pin 2 is made in another suitable manner and, as the case may be, with other suitable means. In a not illustrated example of embodiment, the circumference of the bending flange 4 has neither the shaped groove 40 nor the recess 41 but is from the upper end of the bending flange 4 made as a substantially cylindrical surface ended at the lower end of the bending flange 4 by a rounding oriented away from the axis of the bending flange. In this case, the bending flange 4 need not be seated on the central pin 3 rotatably. Fixed seating on the central pin 3 will do because during the motion of the bending means to the bending plane the tube to be bent passes through the gap between the bending roller and the cylindrical part of the circumferential surface of the bending flange 4 as far as the area of bending between the bending means.

The bending head operates as follows. Before the beginning of the working cycle of each bending head, the tube to be bent Is inserted and clamped in a clamping means. The bending means of each bending head is situated in its rest position, and the central pin 3 is locked by the fixing device against undesired motion.

The control bushing 5 with the bending body occupies its basic position, see Fig. 2, and the angular position of the bending flange 4 ensures that the shaped groove 510 of the bending body faces its recess 41 thus increasing the gap between the bending flange and the bending body. The stop device for setting the angular value of rotation of the control bushing 5 around the longitudinal axis of the hollow pin 2 and of the central pin 3, e., for defining the angular value of the bending to be effected by the motion of the shaped groove 510 of the bending body along the shaped groove 40 of the bending flange 4, is set to the predetermined required value. In the following step,

the fixing device is released and thus sets the central pin 3 free to carry out straight axial motion in the cavity of the hollow pin by which the contra! pin 3 to9RthRr with the control bushing 5 goes out so that the bending means move from their rest position to their position in the bending plane of their respective bending. The tube to be bent is inserted through the enlarged gap created between the bending flange 4 and the bending body between these two components. In this position, with the bending means situated in the bending plane and the tube to be bent bearing on the support surface 3010 of the bending support 301, the central pin 3 in the hollow pin 2 is again fixed by the fixing device. The bending surface 4 is then turned around the longitudinal axis of the central pin 3 to a position in which its shaped groove 40 faces the shaped groove of the bending body, see Figs. 2 and 5, and thus clamps the tube to be bent between the shaped groove 40 of the bending flange 4 and the shaped groove 510 of the bending body as shown in Fig. 3. The control bushing 5 is then turned around the longitudinal axis of the hollow pin 2 and of the central pin 3 which makes the shaped groove 510 of the bending body move along the shaped groove 40 of the bending flange 4 and thus bends the tube on the bending flange 4. After the predetermined angle of the bending has been reached the turning motion of the control bushing 5 is first stopped and then in the same manner resumed in reverse direction until the bending body reaches its initial position. If the bending body is made as a bending roller 51 the whole bending roller 51 moves along the shaped groove 40 of the bending flange 4 during the rotary motion of the control bushing 5, rolls on the tube being bent and thus turns around its axis of symmetry. If the bending body is made as the bending stone 55 the rotary motion of the control bushing 5 makes the pin 551 move along the shaped groove 40 of the bending flange 4 as shown by the arrow X. Since the pin 551 is seated in the longitudinal groove 550 of the bending stone 55 the pin 551 moves in this longitudinal groove 550 as shown by the arrow Y thus compressing the spring 552 and at the same time gradually making the shaped groove 510 of the bending stone 55 roll on the tube in process of bending while at the same time turning the bending stone 55 around the axis of the pin 551 to the tangential direction relative to the bending flange 4 as shown by the arrow Z. The reverse rotation of the control bushing 5 to its initial position brings the bending stone 55 under the action of the compression spring 552 and the longitudinal groove 550 on the pin 551 back to its initial position shown in Fig. 5. The bending flange 4 is

then turned around the longitudinal axis of the central pin 3 so as to face the bending body with its recess 4, a,,d the bent tube is thus released from its clamping betwve,, the two shaped grooves 40, 510. Then is released the fixing device, and the central pin 3 together with the control bushing carries out an axial straight motion to its initial position in which the bending means take up their rest position.

Patent claims

1 Bending head comprising a hollow pin whose cavity contains a central pin seated adjustably in axial direction but locked against turning around its longitudinal axis, fitted with a bending flange and carrying a control bushing adapted both to share the axial motion of the central pin and to turn around the longitudinal axis of the central pin and of the hollow pin, the control bushing being coupled with a drive and carrying a bending body which is together with the bending flange permanently situated in a plane perpendicular to the longitudinal axis of the central pin, characterized by that the control bushing (5) and the central pin (3) are seated in and on the hollow pin (2) adjustably in the axial direction by a straight motion and that the bending head comprises a fixing device of the central pin (3).

2 Bending head as claimed in Claim 1, characterized by that the fixing device contains a fixing pin (6) mounted in the wall of the hollow pin (2) radially adjustable in relation to the hollow pin (2) and adapted to be related by its front end to a pair of fixing holes (33) produced mutually apart in the radial direction in the central pin (3) 3 Bending head as claimed in any of Claims 1 and 2, characterized by that the central pin (3) is adapted to be locked against turning around its longitudinal axis by means of a radial through-hole (34) with an inserted pin (35) whose at least one end reaches outside the central pin (3) into an axial groove (20) provided in the hollow pin (2).

4. Bending head as claimed in any of Claims 1 to 3, characterized by that a bending flange (4), coupled with its drive, is mounted on the central pin (3) rotatably around the longitudinal axis of the central pin (3) and is on a part of its circumference fitted with a shaped groove (40), and on the other part of its circumference, with a recess (41).

5. Bending head as claimed in Claim 4, characterized by that the bending flange (4) contains a central hole by means of which it is mounted on the central pin (3) in a way permitting its rotation/ turning around the longitudinal axis of the central pin (3) but locking it against undesired axial displacement.

6 Bending head as claimed in Claim 5, characterized by that the central pin (3) is fitted with a packing piece (30) situated under the bending flange (4) and supporting it from its lower side while the upper side of the bending flange (4) is in contact with a support ring (31) fastened with a screw (32) screwed into the front of the central pin (3).

7. Bending head as claimed in any of Claims 1 to 6, characterized by that the bending body mounted on the control bushing (5) is made as a bending roller (51) fitted on its circumference with a shaped groove (510) for the tube to be bent.

8. Bending head as claimed in any of Claims 1 to 6, characterized by that the bending body mounted on the control bushing (5) is made as a bending stone (55) equipped on its front side with a shaped groove (510) for the tube to be bent, lengthwise situated in tangential direction relative to the bending flange (4), and along its length fitted with a longitudinal groove (550) receiving the end of a pin (551) mounted in a control arm (50) and adjustable in the longitudinal direction 9. Bending head as claimed in Claim 8, characterized by that the bending stone (55) is fitted with a fixing means for setting the front end (553) of the bending stone (55) to its initial position for carrying out another bending.

10. Bending head as claimed in Claim 9, characterized by that the fixing means for setting the front end (553) of the bending stone (55) to its initial position for carrying out another bending is made as a compression spring (552) situated in

the longitudinal groove (550) of the bending stone (55) between the pin (551) and the end side of the longitudinal groove (550) in the bending stone (55).

rent" - o,Y I id, Application No: GB 0213056.5 Exammer: Karl Whitfield

Claims searched: 1 to 10 Date of search: 30 September 2002 Patents Act 1977 Search Report under Section 17 Databases searched: : UK Patent Office collections, including GB, EP, WO & US patent specifications, in::

UK Cl (Ed.T): B3E Int Cl (Ed.7): B21 D Other: Online databases: Derwent World Patents index, Patent Abstracts of Japan and European Patent Office Docnnents considered to be relevant:: Category Identity of document and relevant passage Relevant to claims _ A GB 2293784 see esp fig I t A GB 2195931 see esp figs 2 & 3 A US 4961335 see esp figs A US 4760726 see esp figs 5 & 6 A US 4727738 see esp figs 2 & 3 A US 4063441 see esp fig 3 -. X Document mdcalmg lack of novcity or nvenbve step A Document mdcatmg technological background and/or stale of the an

Y Document indicating lack of mventve step If combined P Documentpubbsiled on oraQer the declared pnontydate huthetorc the with one or more other documents ot same category Ghng date of tints nventmn E Patent document published on or after. hut with panty date earher Member of the same patent tamely than, the fihng date of tints appheabon An Executive Agency o! the Department of Trade and I ndustry

0 (')tllie '')' - rNViSIOR Pl:OPLi Application No: GB 0213056. 5 Examiner: Karl Whitfield

Claims searched: 1 to 10 Date of search: 30 September 2002 Patents Act 1977 Search Report under Section 17 Databases searched: UK Patent Office collections, including GB, EP, WO & US patent specifications, in:

UK Cl (Ed T): B3E Int Cl (Ed.7): B21 D Other: Online databases: Derwent World Patents index, Patent Abstracts of Japan and European Patent Office Documents considered to be relevant: Category Identity of document and relevant passage Relevant to claims A GB 2293784 see esp fig I A GB 2195931 see esp figs 2 & 3 A US 4961335 see esp figs A US 4760726 see esp figs 5 & 6 A US 4727738 see esp figs 2 & 3 A US 4063441 see esp fig 3 X Document mdtcatng lack of novelly omovenbve step A Document Indicuhug techn,logcal l ackground and/or stale of the art Y Document Indicatmg lack of Inventive step If comhned P Documentpubilsiled on oruRerthe decinredpnontydatebuthefore the with one or more other documents ol same category Sling date of this mvenbon E Patent document published on or after, hut with panty date earhcr 8: Membel of lile same patent family than, the Thug date of this application An Executvc Agency of the Department of Trade and Industry

%-)l - INVESTOR IN P} OPLE

Claims

/! i 'I colt Application No: GB 0213056.5 Examiner: Karl Whitfield

Claims searched: 1 to 10 Date of search: 30 September 2002 Patents Act 1977 Search Report under Section 17 Databases searched: UK Patent Ot'f'ice collections, including GB, EP, WO & US patent specifications, in:

UK Cl (Ed.T): B3E Int Cl (Ed.7): B21 D Other: Online databases: Derwent World Patents Index, Patent Abstracts of Japan and European Patent Ot't'ice Documents considered to be relevant: Category Identity of document and relevant passage Relevant to claims A GB 2293784 see esp fig I A GB 2195931 see esp figs 2 & 3 A US 4961335 see esp figs A US 4760726 see esp figs 5 & 6 A US 4727738 see esp t'igs 2 & 3 A US 4063441 see esp fig 3 X Document Educating lack of novelty omnventve step A Document ndcatmg technological background and/or slate of the art.

Y Document mdicanng lack of mventve step if comilned P Documenipublshed on Grafter the dec1Aredpnonty date butbetore the with one or more other documents ot slime category lilmg date of this mventon E Patent document published on or after, hut with pity date earlier 8: Member at the same patent family than, the Chug date of this applcahon _ An ExecullvcAgency of the Department of Trade and Industry