Threaded connection device for pipes

Abstract: Threaded connection device for pipes including a cylindrical sleeve (2) having, at both its ends, fasteners (4) for the connection with a flexible pipe, two internally threaded rings (10, 10') each one screwing on one end of the sleeve (2). Said rings have a circular rim (11) for the seaming and the compression of the pipe around the said sleeve (2) fasteners (4). Said sleeve (2), in connection with the ring (10, 10') thread, has a thread part having a pitch multiple as to the thread pitch of the ring itself.

Description: The present invention relates to a threaded connection device for pipes. In particular, the present invention relates to a device, as said above, allowing to reduce the internal tension due to the connection itself and the production costs of the nipple. It is known see, for example, WO-A-84/02760 that in the pipe nipples of the typical sleeve-ring type it is noticed a great increase of the sleeve diameter near the thread because of the necessity to seam with the same ring variable thickness pipes. Such a necessity causes a rise of the production costs of the nipple because of a great increase of the pressing times and of the amount of material used for the molding of the nipple itself. Goal of the present invention is to obviate the above-mentioned disadvantages. More particularly, goal of the present invention is to make a threaded connection device for pipes allowing to reduce the amount of material required to make the connection itself. A further goal of the present invention is to propose a threaded connection device for pipes allowing to reduce the internal tensions during its making, due to a more uniform cooling due to a better distribution of the thickness in the threaded part. A further goal of the present invention is to propose a threaded connection device for pipes being characterised by great resistance and reliability in time, easy and inexpensive to make. These and other goals mentioned later on are reached by the threaded connection device for pipes, subject of the present invention, including a cylindrical sleeve having, at both its ends, fasteners for the connection with a flexible pipe, at least one internally threaded ring screwing on at least one end of the sleeve, said ring having a circular rim for the seaming and the compression of the pipe around the above mentioned sleeve fasteners, characterised in that said sleeve has, in connection with the ring thread, a threaded part having a pitch multiple as to the pitch of the thread of the ring itself. These and further characteristics of the threaded connection device for pipes will be better underlined in the following detailed description, which relates to the figures of the enclosed drawings representing a preferred realisation form and an alternative one, illustrative, but not restrictive, of the invention itself, where: Figure 1 schematically shows in longitudinal section the threaded connection device for pipes according to a preferred realisation form of the present invention. Figure 2 schematically shows in longitudinal section the threaded connection device for pipes according to an alternative realisation form of the present invention. Figure 3 schematically shows in side view the threaded connection device for pipes of figure 1 without the connection rings at the pipes. Figure 4 schematically shows in cross section along the line A-A of figure 3 the same connection device for pipes. Referring to the mentioned figures, the connection device for pipes according to the present invention includes a cylindrical sleeve 2 having, at both its ends, fasteners 4 for the connection with a flexible pipe and, in its central part, a pair of opposing tongues 6 both provided with a plurality of knurlings 8 to make their hold easier during the manual rotation. The device includes, moreover, an internally threaded ring 10 screwing on one end of the sleeve 2 and a second one 10', same to the first, screwing on the opposite end of the same sleeve. Both rings co-operate with the sleeve for the locking of the pipe and, in order to do that, have a circular rim 11 for the compression of the pipe around the mentioned fasteners 4 of the sleeve 2. According to the present invention, the sleeve 2, in connection with both the threads of the rings 10 and 10', has a first part of thread 12 placed along an helical line and a second part of thread 14 placed on the same helical line. Said parts of thread 12 and 14 are divided by a threadless part 16. Moreover, the threaded parts 12 and 14 have two longitudinal opposing grooves 18 18' passing through the threads. From the preceding detailed structural description of the device subject of the present invention, it becomes clear its functioning and use. The end of a generical pipe is at first introduced in the ring 10 or 10' and restrained to the sleeve 2 through the fasteners 4. In a second time the ring itself is screwed on the sleeve, by means of the mentioned threads, and its circular rim 11 allows the compression of the pipe end around the mentioned fasteners 4 of the sleeve 2, this way steadily joining the pipe to the sleeve itself. From the preceding detailed description of the structural and functioning characteristics of the device subject of the present invention, are better underlined the advantages mentioned above. In fact, the sleeve discontinuous threading allows the reduction of the amount of material required to mold the nipple itself. To the same goal are made the said longitudinal grooves allowing to save plastic material during the molding of the connection. The invention, as described and later on claimed, has been however proposed with mere illustrative purpose, being understood that the same could be susceptible of many modifications or variations, in any case all within the invention concept as defined by the following claims. It is, at last, to be understood possible eventual structural reversal or alternative dislocations of the components altogether constituting the device subject of the present invention without departing from the scope of the claims annexed hereto.

Claims: A threaded connection device for pipes including a cylindrical sleeve (2) having, at both its ends, fasteners (4) for the connection with a flexible pipe, at least one internally threaded ring (10, 10') screwing on at least one end of the sleeve (2), said ring having a circular rim (11) for the seaming and the compression of the pipe around the said sleeve (2) fasteners (4), characterised by the fact that said sleeve (2), in connection with the ring (10, 10') thread, has a thread part having a pitch multiple as to the thread pitch of the ring itself. A device according to claim 1, characterised by the fact that the thread part of the sleeve (2) has the thread pitch double as to the thread pitch of the ring (10, 10'). A device according to the preceding claims, characterised by the fact that the sleeve (2) thread has a first part of thread (12) placed along an helical line and a second part of thread (14) placed along an helical line, substantially along the extension of the first part, said two parts of thread (12 and 14) being divided by at least one threadless part (16) and corresponding to a angle from 1° to 360°. A device according to claim 3, characterised by the fact that said threaded parts (12 and 14) of the sleeve (2) have one or more longitudinal grooves (18 and 18'), preferably angularly equidistant, opposing, passing through the threads.

Inventors: GIUFFRE CARMELO, GIUFFRE, CARMELO
Applicants: IRRITEC S R L, IRRITEC S.R.L.
Application year: 1998
Main classification: F16L19
IPC codes: F16L33