FR2646792A1 - APPARATUS FOR EXTENDING OR EVASING THE END OF TUBES - Google Patents

Abstract

The object of the invention is a new apparatus intended to widen the ends of the tubes which comprises a body 1, an expansion tool, a mandrel 2, a rod 3 and two handles, one of which 7 is integral with the body while the 'other 4 is connected to said body by the connecting rod which gives it a movable fulcrum allowing it to transmit to the mandrel to which it is linked by a direct articulation, an axial force all the greater as said movable handle approaches the handle fixed. Once the tube has expanded, the mandrel is extracted from the inside of the set of jaws of the tool by the tensile force exerted on it by the movable arm which the operator returns to its initial position. This device makes it possible to make the necessary sockets to connect the copper pipes of the sanitary installations.

Description

The present invention relates to an apparatus for expanding or

  ends of the tubes or similar articles comprising a movable handle and a fixed handle integral with a body traversed by a mandrel, which under the action of an external force applied to the sleeves moves axially and forces to move radially away from each other; others expandable jaws grouped into a game that with the threaded ring the

  retaining against the body of the device constitutes a tool for in-

terchangeable.

  US Patent 2,999,529 of 12 September 1961 and the French patent

  1 581 127 of July 25, 1968, relate to apparatus of this type, but in these latter, it is an eccentric or a cam integral with the movable lever which pushes the mandrel in the axis of the jaw set by applying to the opposite side to its conical end the effort-resulting from the action of the operator. Thus in the absence of traction means of said mandrel, its return only results from the approximation of the jaws under the action of the restoring means in the rest position which is either a spring or an elastic ring mounted tightly on the outer circumference of the

set of jaws.

  Whatever the tools used with these devices, the operator always has difficulties to get the chuck back once

  that the end of the tube has been enlarged. This is due to the fact that the effort is

  spring-loaded or elastic rod is insufficient to overcome the inevitable friction that exist and oppose any displacement at the contact areas of said mandrel with the jaws and with the

body.

  One of the aims of the present invention is to remedy these difficulties.

  the return of the mandrel by connecting it to the movable handle

  culation comprising a link. The proposed solution allows to apply if necessary to the mandrel an extraction effort which is only limited by

  the force developed by the operator on the two handles of the device.

  In the following, the invention is explained in detail with the aid of drawings representing only one embodiment given by way of non-limiting example:

  FIG. 1 is a longitudinal sectional view of a

  plet represented in the position that allows him to receive the end

of the tube to work.

  FIG. 2 is a side view of the apparatus without a tool

felt closed arms.

2646T92

  The apparatus for widening the ends of tubes or the like

  1, comprises a body (1), an expansion tool with

  choirs, a mandrel (2), a rod (3) and two sleeves, one of which is movable (4) is hinged directly on the mandrel while being held close to the body by the rod which consists of one or more thick sheet metal. The body and the fixed handle (7) which carries it have a plane of symmetry which must coincide with that of the movable handle and its front groove (5). For this, the maintenance provided by the flanks of the rod at the groove serving as a yoke is reinforced by the guide resulting from the insertion of the tail (6) of the mandrel in the same groove, because the flattened shape obtained by double milling of said tail is adjusted to the width of the screed. The diameter of the base circumference of the conical end (8) of the mandrel being greater than that of the cylindrical portion sliding in the body (1), said conical portion can not enter the bore of said body beyond the shoulder (9)

  marking the bottom of the room (10). Moreover, when the mandrel is immo

  bilized against this abutment, its conical end is no longer in contact with the jaws of the tool which thereby are collected against each other under the action of the spring (11). The passage of this

  position to that shown in Figure 1 is only a preliminary approach phase

  yielding the phase of expansion of the jaws.

  So that the engagement of the tapered end of the mandrel between the jaws of the tool does not require from the operator an excessive effort on the sleeves, the rod (3) which pivots about an axis (13). ) integral with the body of the device ensures the movable handle a fulcrum on said body such as the multiplication ratio of the effort provided

  by the operator increases as this moving stick becomes

close to the fixed handle.

  Still in FIG. 1, it can be seen that the link (3) whose hinge pins (13) and (14) are identical to that (15) of the tail of the mandrel on the mobile handle, has a recess (16) which gives it a specific arched shape leaving free space sufficient for the tail (6) of the mandrel not to strike said link when the

  movable handle gets closer to the fixed handle.

  Referring to Figure 2 which presents a side view of the same

  tool-less device after 50 Z reduction and closer

  we find that the distance X separating the center of the axis of articulation

  tion (13) of the rod on the body and the axis A of the mandrel is equal to the distance Y between the centers of the two axes of articulation (14), (15), the movable handle. Similarly the distance Z separating the centers of the two axes (13), (14) of the rod is equal to two and a half times the

  distance Y separating the centers of the two axes of the movable handle.

  The engagement of the mandrel between the jaws of the screwed tool on the body of the apparatus being obtained by bringing the movable handle of the fixed handle closer, said jaws move away more and more from each other as and when that the movable handle approaches the fixed handle. To obtain a desired diameter expansion of the tube covering the jaws, the radial forces generated between these jaws must

  to increase constantly. Thus, to limit to an acceptable value the

  increasing the effort required from the operator, the length T of the lever arm existing at the mobile arm between the articulation center (14) of the rod and the extension of the axis A of the mandrel (2) decreases gradually to equal one third of the distance X, or four millimeters when the handle (17) of the movable handle comes to touch that

(18) of the fixed handle.

  At the end of the expansion phase, when the jaws have been

  maximum permitted by the inside diameter of the tool ring,

  the direct articulation of the mandrel on the mobile handle allows the operator to

  the complete return of the mandrel to its original position in

avoiding his jamming.

  This device that can receive most of the tools currently

  available in specialized shops enables the embol-

  necessary for the connection of annealed copper tubes, which are

  against in sanitary facilities.

Z646792

Claims (7)

R E V E N D I C A T I 0 N S CLAIMS   1) Apparatus for expanding or flaring the ends of tubes or the like by expanding the jaws of a body-mounted tool (1) which integral with a fixed handle (7) is adapted to engage the conical end (8) mandrel (2) between the jaws of the tool under the action of a movable handle (4) acting as a   lever, characterized in that the movable handle is   directly tilted on the mandrel by means of its yoke whose axis (15) rotates freely in the bore made in the tail (6) of said mandrel.   2) Apparatus for expanding the ends of the tubes according to claim 1, characterized in that the movable handle (4) is   connected to the body (1) by a rod (3) consisting of one or more Thicknesses of sheet metal.   3) Apparatus for expanding the ends of the tubes according to claim 2, characterized in that the rod (3) of particular shape which pivots about an axis (13) integral with the body of the apparatus maintains the movable handle in the plane of the fixed handle and gives it a fulcrum on the body such that the multiplication ratio of the effort provided by the operator increases as   and as said movable handle approaches the fixed handle.   4) Apparatus for expanding the ends of the tubes according to claim 2, characterized in that the link (3) comprises   a recess (16) conferring on it a specific arched shape   free space sufficient for the tail (6) of the mandrel to not be struck by said link when the movable handle is brought against the fixed handle.   ) Apparatus for expanding the ends of the tubes according to claim 1 characterized in that the recoil of the mandrel (2) is limited by a shoulder (9) which abuts at the bottom of the   chamber (10) extending the bore of the body of the apparatus.   6) Apparatus for expanding the ends of the tubes according to claim 2, characterized in that the hinge pins (13,14) of the rods and the one (15) passing through the tail of the mandrel are identical.   7) Device for expanding the ends of the tubes according to claim 3, characterized in that the holding of the handle mobSe 2t 46792   in the plane of the fixed handle already secured by the link is   forced by insertion into the movable handle of the tail (6) of the   mandrel whose flat shape obtained by double milling is   the width of the yoke (5) of said handle; 8) Apparatus for expanding the ends of the tubes according to claim 6, characterized in that the distance from the center of the axis of articulation (13) of the link on the body to the axis A of the mandrel is equal to that separating the centers from the two axes   hinge (14), (15) of the movable handle.   9) Apparatus for expanding the ends of the tubes according to claim 6, characterized in that the distance separating the centers of the two axes (13), (14) of the link is equal to 2.5   times that separating the centers of the two axes of the movable handle.   Apparatus for expanding the ends of the tubes according to claim 2, characterized in that as the movable handle approaches the fixed handle, the length of the arm of the   lever at the mobile arm between the center of the articu-   (14) of the rod and the extension of the axis A of the man-   drin (2) gradually decreases to 1/3 of the distance between the center of the axis (13) and the axis A of the mandrel, ie 4 mm when the handle (17) of the movable handle comes to touch that (18) of the fixed handle.