GB1559287A

GB1559287A - Tool for forming a socket at the end of a tube

Info

Publication number: GB1559287A
Application number: GB4203776A
Authority: GB
Original assignee: Individual
Current assignee: Individual
Priority date: 1975-10-10
Filing date: 1976-10-08
Publication date: 1980-01-16
Also published as: ES231892Y; FR2326998A1; DE2645830A1; ES231892U; BE847098A; DE2645830C2; IT1070365B; FR2326998B1

Description

(54) A TOOL FOR FORMING A SOCKET AT THE END OF A TUBE (71) I, JOSEPH ROBLES, a French citizen, of 19 rue Denfert Rochereau, 31000 Toulouse, France, do hereby declare the invention for which I pray that a patent may be granted to me, and the method by which it is to be performed, to be particularly described in and by the following statements:- The present invention relates to a tool for forming a socket at the end of a tube, that is to say a tool by means of which it is possible to increase the internal circumference of the end of a tube to enable it to receive the end of another tube.

It is an object of the invention to provide a tool which enables regularly-shaped sockets of different diameters to be produced, that is to say sockets of cylindrical cross-section containing an internal shoulder against which the tube to be connected can abut.

It is a further object to provide a tool of small size which is however sufficiently strong to perform the function referred to and which is such that it can either be used in a workshop or can easily be carried about in a tool kit for use on site.

To this end, the invention consists in a tool for forming a socket at the end of a tube, so as to receive the end of another tube which tool comprises two longitudinal members of semicircular cross-section hinged together in the direction of their length along their junction plane, and provided with means which enable them to be operated to move apart and together again about said hinge within a tube, so as to form a socket on said tube by increasing the circumference of the wall thereof.

Each of the longitudinal members preferably comprises a plurality of parts of different circumference corresponding to the various diameters of the tubes at whose ends sockets can be formed.

The said members are hinged together by means of a pin which is arranged in the longitudinal part having the largest circumference, these parts or steps forming a support for the operating means, the pin lying within the circumference of the two members when the members are closed together.

Preferably, the axis of the longitudinal pin lies on an extension of the generatrix of the step of least circumference at the end of the tool. It will be realised that this arrangement makes the tool according to the invention particularly strong by preventing whichever step is being used from overhanging with respect to the pin. The means of operating the members to move apart and together again are formed by two handles which are secured to respective ones of the said members, and specifically to the step of largest circumference, perpendicularly to the hinge pin.

In another embodiment of the invention, the longitudinal hinge pin is substantially centrally located along the members and each member comprises a plurality of parts of different circumference to each side of said pin, the parts on one side being of different circumference from the parts on the other side.

This embodiment of the invention makes it possible to increase the capabilities of the tool as regards the diameter of the tubes in which it can be used, by providing steps of different cross-section at either end.

Other advantages and features of the invention will become apparent from perusal of the following description of embodiments of the invention, which are given by way of nonlimiting example and which are illustrated in the accompanying drawings, in which: Figure 1 is an elevation view of a tool according to the invention in the closed state, Figure 2 shows the tool according to the Figure 1 in the open state, Figure 3 is a side view of the tool according to Figures 1 and 2 with the pin shown in broken lines, Figure 4 is a view of the tool according to Figures 1, 2 and 3 seen from the back, Figure 5 shows another embodiment of the tool according to the invention, Figure 6 shows the tool according to Figures 1 to 4 as used in a tube, and Figure 7 shows an elevational cross-section of the socket which is produced, and the tool therewithin.

Referring now to the drawings, as shown in Figure 1, a tool according to the invention is formed from two longitudinal members 1 and l b each of which is semi-circular in form and each comprises a plurality of parts or steps of different circumference.

The two members 1 and 1b are hinged together along their junction plane 2 by means of a longitudinal pin 3 which is inserted in knuckles 4 and 4b. These knuckles are machined into the back of the largest step 5 of each of the said members.

The series of steps 6 of different circumference correspond to the various inside diameters of the tubes in which the tool can be used. Preferably, the edges of each of the members, which are called upon to move apart and together again, have a bevel 7, while the edges near the hinge also have a bevel 8 which enables them to rotate freely about the pin.

The hinge pin 3, which is longitudinal to the step 5 of each of the members, lies inside the circumference of the two members when they are closed together, and it is preferably situated on an extension of the generatrix of the surface af the cylindrical step of least circumference formed by closing the members.

By virtue of this provision, the members, when rotated about the pin, never overhang no matter which steps are inside the tube, and this endows the tool with remarkable strength and enables it to exert very considerable forces against the wall of the tube. The means for operating the longitudinal members 1 and 1b to move apart and together again about their hinge pin 3 are formed by two handles 9 which are secured to the steps 5 of respective ones of the said members.

Preferably, the handles 9 are attached by welding or are screwed into threaded bores in the steps 5 so that they are set away from the pin 3 and can thus exert the maximum force.

To this end, the points at which the said handles are attached perpendicularly or obliquely to the junction plane will be positioned to one side of the pin.

In another embodiment of the invention shown in Figure 5, each of the members has a series of steps on each side of the head 5 which carries the pin 3, the pin being centrally positioned. Since each of the series of steps arranged on either side of the step 5 have different circumferences this makes it possible substantially to increase the capabilities of the tool in respect of the tubes on which sockets can be formed.

The way in which the tool operates, which is shown in Figures 6 and 7, is as follows: The user inserts the tool into a tube 10 as far as the step whose diameter corresponds to the inside diameter of the tube.

The two members 1 and ib are moved apart about their pin and brought back together again, the effect of which is to apply the cylindrical part 11 of the step in question to the inside wall of the tube 10 and, as the opening movement continues, to stretch the portion 12 of the wall of the tube situated between the two members 1 and lb. Then, after having closed the tool inside the tube, the user rotates it so as to repeat the operation on other parts of the wall, which stretches and increases its circumference over the entire axial length of the step which presses against it. By virtue of the rotation of the tool and its repeated action at different successive points around the wall of the tube, the socket is of regular round shape.

In addition, the steps below the one which presses against the tube form a means of limiting penetration of the tool.

The construction shown enables regular round sockets to be formed in the end of a tube, as shown in Figure 7, without tearing the wall of the tube, by virtue of the progressive stretching action which it exerts on the wall of the tube.

The socket as formed in the end of tube contains an internal shoulder 15 against which the tube to be connected will abut when inserted.

WHAT I CLAIM IS:- 1. A tool for forming a socket at the end of a tube so as to receive the end of another tube, which tool comprises two longitudinal members of semi-circular cross section hinged together in the direction of their length along their junction plane, and provided with means which enable them to be operated to move apart and together again about said hinge within a tube, so as to form a socket on said tube by increasing the circumference of the wall thereof.

2. A tool as claimed in claim 1 wherein each of said longitudinal members comprises a plurality of parts of different circumference forming a series of steps.

3. A tool as claimed in claim 1 or 2, wherein the hinge pin lies inside the circumference of the two members when they are closed together.

4. A tool as claimed in claim 2 and 3, wherein the hinge pin lies on an extension of the generatrix of the step of least circumference.

5. A tool as claimed in any preceding claim wherein the means for moving the longitudinal members are formed by two handles which are respectively secured to said members.

6. A tool as claimed in claim 5, wherein each of the handles is screwed into a threaded seating in one of the members.

7. A tool as claimed in any preceding claim, wherein the edges of each of the members remote from the hinge pin are bevelled.

8. A tool as claimed in any of claims 1 to 6, wherein the hinge pin is substantially centrally located along the members and wherein each member comprises a plurality of parts of dif

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. Figure 6 shows the tool according to Figures 1 to 4 as used in a tube, and Figure 7 shows an elevational cross-section of the socket which is produced, and the tool therewithin. Referring now to the drawings, as shown in Figure 1, a tool according to the invention is formed from two longitudinal members 1 and l b each of which is semi-circular in form and each comprises a plurality of parts or steps of different circumference. The two members 1 and 1b are hinged together along their junction plane 2 by means of a longitudinal pin 3 which is inserted in knuckles 4 and 4b. These knuckles are machined into the back of the largest step 5 of each of the said members. The series of steps 6 of different circumference correspond to the various inside diameters of the tubes in which the tool can be used. Preferably, the edges of each of the members, which are called upon to move apart and together again, have a bevel 7, while the edges near the hinge also have a bevel 8 which enables them to rotate freely about the pin. The hinge pin 3, which is longitudinal to the step 5 of each of the members, lies inside the circumference of the two members when they are closed together, and it is preferably situated on an extension of the generatrix of the surface af the cylindrical step of least circumference formed by closing the members. By virtue of this provision, the members, when rotated about the pin, never overhang no matter which steps are inside the tube, and this endows the tool with remarkable strength and enables it to exert very considerable forces against the wall of the tube. The means for operating the longitudinal members 1 and 1b to move apart and together again about their hinge pin 3 are formed by two handles 9 which are secured to the steps 5 of respective ones of the said members. Preferably, the handles 9 are attached by welding or are screwed into threaded bores in the steps 5 so that they are set away from the pin 3 and can thus exert the maximum force. To this end, the points at which the said handles are attached perpendicularly or obliquely to the junction plane will be positioned to one side of the pin. In another embodiment of the invention shown in Figure 5, each of the members has a series of steps on each side of the head 5 which carries the pin 3, the pin being centrally positioned. Since each of the series of steps arranged on either side of the step 5 have different circumferences this makes it possible substantially to increase the capabilities of the tool in respect of the tubes on which sockets can be formed. The way in which the tool operates, which is shown in Figures 6 and 7, is as follows: The user inserts the tool into a tube 10 as far as the step whose diameter corresponds to the inside diameter of the tube. The two members 1 and ib are moved apart about their pin and brought back together again, the effect of which is to apply the cylindrical part 11 of the step in question to the inside wall of the tube 10 and, as the opening movement continues, to stretch the portion 12 of the wall of the tube situated between the two members 1 and lb. Then, after having closed the tool inside the tube, the user rotates it so as to repeat the operation on other parts of the wall, which stretches and increases its circumference over the entire axial length of the step which presses against it. By virtue of the rotation of the tool and its repeated action at different successive points around the wall of the tube, the socket is of regular round shape. In addition, the steps below the one which presses against the tube form a means of limiting penetration of the tool. The construction shown enables regular round sockets to be formed in the end of a tube, as shown in Figure 7, without tearing the wall of the tube, by virtue of the progressive stretching action which it exerts on the wall of the tube. The socket as formed in the end of tube contains an internal shoulder 15 against which the tube to be connected will abut when inserted. WHAT I CLAIM IS:-

1. A tool for forming a socket at the end of a tube so as to receive the end of another tube, which tool comprises two longitudinal members of semi-circular cross section hinged together in the direction of their length along their junction plane, and provided with means which enable them to be operated to move apart and together again about said hinge within a tube, so as to form a socket on said tube by increasing the circumference of the wall thereof.

ferent circumference to each side of said pin, the parts on one side being of different circum ference from the parts on the other side.

9. A tool substantially as hereinbefore described with reference to Figures 1 to 4, 6 and 7 of the accompanying drawings.

10. A tool substantially as hereinbefore described with reference to Figure 5 of the accompanying drawings.