초록 ▼

Integrally stiffened and formed, load carrying structures comprising a plurality of elongated thin-walled tubes placed co-extensively in a complementary side-by-side fashion which together form a hollow structure having a desired external contour. Integral skins forming the external and internal sur

Integrally stiffened and formed, load carrying structures comprising a plurality of elongated thin-walled tubes placed co-extensively in a complementary side-by-side fashion which together form a hollow structure having a desired external contour. Integral skins forming the external and internal surfaces of the structure cooperatively therewith. The structure can be formed with an underlying internal support member spanning the interior of the load carrying structure, thereby connecting opposite sides of the structure together. Also, each of the tubes are wound with fibers in controlled orientations generally paralleling the direction of the loads applied to the tubes to optimize the strength to weight ratio of the tubes.

대표청구항 ▼

Integrally stiffened and formed, load carrying structures comprising a plurality of elongated thin-walled tubes placed co-extensively in a complementary side-by-side fashion which together form a hollow structure having a desired external contour. Integral skins forming the external and internal sur

Integrally stiffened and formed, load carrying structures comprising a plurality of elongated thin-walled tubes placed co-extensively in a complementary side-by-side fashion which together form a hollow structure having a desired external contour. Integral skins forming the external and internal surfaces of the structure cooperatively therewith. The structure can be formed with an underlying internal support member spanning the interior of the load carrying structure, thereby connecting opposite sides of the structure together. Also, each of the tubes are wound with fibers in controlled orientations generally paralleling the direction of the loads applied to the tubes to optimize the strength to weight ratio of the tubes. g and axial retention of the mandrel. 18. Device according to claim 17, in which said centers can be made to move toward and away from each other. 19. Device according to claim 17, in which said centers can be moved vertically to modify their position with respect to the surface of the cylinders. 20. Device according to claim 12, in which each of said heads has a moving support for the corresponding cutting tool, at least one stop to determine at least one operating position of said cutting tool, and an actuator to bring the cutting tool to said operating position or to a nonoperating position. 21. Device according to claim 20, in which said stop is adjustable. 22. Device according to claim 20, in which each head has stops for determining two alternative operating positions of the corresponding tool without the need for adjustment. 23. Device according to claim 12, comprising a control unit for controlling the movement of said head or heads, said control unit being connected to a rewinding machine provided with means of cutting a web material longitudinally, in such a way that the positions in which said head or heads cut the tube to form the tubular cores are controlled according to the position of the means of cutting the web material, or vice versa. 24. Device according to claim 12, in which the cutting station comprises a pair of oscillating arms for expelling the mandrel from said cutting station. 25. Device according to claim 12, in which said insertion station comprises an axial sliding channel for said mandrels and a pushing member for pushing said mandrels along said channel. 26. Device according to claim 12, in which a chute is positioned between said cutting station and said insertion station for transferring the mandrel between said two stations. 27. Method for preparing tubular winding cores on a winding mandrel, comprising the stages of: extracting a mandrel from a roll which has been formed; inserting the mandrel into a tube and fixing the tube with respect to said mandrel; cutting the tube into a plurality of tubular cores aligned along said mandrel; inserting the mandrel with the tubular cores fixed on it into a winding machine. 28. Method according to claim 27, in which said mandrel is simultaneously extracted from said roll and inserted into said tube. 29. Method according to claim 27, in which said mandrel is transferred orthogonally to its own axis from a first position, in which it is inserted into said tube, to a second position in which said tube is cut to form said plurality of tubular cores and from there to a third position from where it is moved axially to be inserted into said winding machine. 30. Method according to claim 29, in which said mandrel is transferred from said first and from said second position, and from the latter to said third position, by rolling. 31. Method according to claim 27, in which the mandrel is an expandable mandrel, and in which said mandrel is deflated before being extracted from said roll or rolls and then expanded when it has been inserted into said tube. 32. Method according to claim 27, in which said tube is cut by means of at least two cutting tools acting simultaneously. 33. Method according to claim 27, in which three mandrels are in operation simultaneously, the first being inserted into said tube, the second having the tube cut on it to form the tubular cores, and the third being in the process of insertion into a winding machine. 34. A method for winding web material onto tubular winding cores, the method comprising the steps of: receiving a mandrel with a plurality of first tubular cores from a winding machine, the first plurality of cores being wound with web material; extracting the mandrel from said plurality of first tubular cores wound with web material; providing a tube; inserting the mandrel into the tube substantially simultaneously with said step of extracting; fixing the mandrel to the tube; cutting the tube into a plurality of second tubula r cores aligned along the mandrel; winding web material onto said plurality of second tubular cores while said plurality of second tubular cores are arranged around the mandrel and fixed to the mandrel. 35. A method according to claim 34, in which said mandrel is transferred orthogonally to its own axis from a first position, in which it is inserted into said tube, to a second position in which said tube is cut to form said plurality of tubular cores and from there to a third position from where it is moved axially to be inserted into said winding machine. 36. A method according to claim 34, in which sad mandrel is transferred from said first and from said second position, and from the latter to said third position, by rolling. 37. A method according to claim 34, in which the mandrel is an expandable mandrel, and in which said mandrel is deflated before being extracted from said roll or rolls and then expanded when it has been inserted into said tube. 38. A method according to claim 34, in which said tube is cut by means of at least two cutting tools acting simultaneously. 39. A method according to claim 34, in which three mandrels are in operation simultaneously, the first being inserted into said tube, the second having the tube cut on it to form the tubular cores, and the third being in the process of insertion into a winding machine. 40. A device for preparing winding mandrels for winding machines the device comprising; an extraction station with an extractor mechanism for extracting a mandrel from at least one roll of web material and for inserting the extracted mandrel into a tube by a single movement; a cutting station with cutting means for cutting the tube fitted on the mandrel into a set of tubular cores aligned on the mandrel; and an insertion station with insertion members for inserting the mandrel with the tubular cores into a winding machine. 41. A device according to claim 40, wherein said extraction station comprises support devices for the tube, said support devices being aligned with the trajectory of the mandrel while it is extracted from a formed roll. 42. A device according to claim 41, wherein said support device consists of a cradle. 43. A device according to claim 42, which said cradle is formed by a roller train. 44. A device according to claim 42, in which said support cradle is vertically movable between a lower position for loading said tube and an upper position for the extraction of the mandrel from the at least one roll. 45. A device according to claim 40, which a chute is positioned between said extraction station and said cutting station for transferring the mandrel from the extraction station to the cutting station. 46. A device according to claim 40, which said extractor mechanism comprises a pair of shaped rollers, at least one of which is powered, between which the mandrel to be extracted is gripped. 47. A device according to claim 46, in which both of the shaped rollers are powered. 48. A device according to claim 40, in which said extraction station comprises means for causing the deflation of the mandrel before it is extracted from the at least one roll and for its expansion after insertion into said tube. 49. A device according to claim 40, which said cutting station comprises a pair of cylinders forming a rotation cradle for said mandrel and, above said cylinders, at least one head carrying a cutting tool, which is movable along the axial extension of said cylinders. 50. A device according to claim 49, which said cutting tool is a discoid blade idly supported on said head. 51. A device according to claim 50, comprising at least two heads with corresponding cutting tools, said heads being movable along two parallel paths, independent actuating means being provided for said at least two heads. 52. A device for preparing winding mandrels for winding machines the device comprising: an extraction station with an extractor mechanism for extracting a mandrel from at least one rol