EP0276586B1 - Retaining device for an exchangeable last receiving a shoe to be repaired - Google Patents

Description

The present invention relates to a retaining device for interchangeable shapes, which considerably improves the devices which are currently used for positioning a shoe in order to allow its repair.

Currently, when carrying out repair work on a shoe, shoemakers use interchangeable shapes, which vary according to the size of the shoe, and are arranged on supports, to which they are fixed by means of an actuating device. fast, which should facilitate the exchange of said forms, when one wishes to work on a shoe of different size.

One of the most commonly used systems for fixing said forms, consists in introducing the rod of the form inside a tube which projects vertically from the support, fixing it by means of a screw perpendicular to the rod of the form, and which retains it by preventing any movement. This type of binding presents the difficulty that, if the shape is mounted asymmetrically with respect to the axis of the base, the repeated blows that are struck on it, when working the shoe, have for consequence of increasing the tolerances existing between the screw and the rod of the form, making this operation very difficult, since the fixing system described then takes play.

Another type of device currently used consists of a lateral tightening carried out on the tube of the rod which holds the shape, by means of a nut or the like, sliding on the external part of this rod, which is provided with a certain taper. , cf. US-A-2,191,079
Thanks to this arrangement, when the nut is rotated, the pressure of the tube is increased against the rod of the form, until it is fixed perfectly. This fixing system is therefore much safer than that previously described, since its wear due to work is practically zero. But its realization is complicated by the fact that the nut has a large diameter, which makes tightening difficult, and leads to making it necessary to use pliers to obtain the final tightening.

The retaining device for interchangeable form constituting the object of the present invention significantly improves all the devices currently existing on the market, since it provides definitive fixing by means of a quick, secure locking system. and requiring little effort.

To obtain this result, the device according to the invention comprises a vertical tube the interior of which is capable of receiving the rod of the form to be immobilized and it is characterized in that this vertical tube contains a horizontal disk intended to support the rod of the form to be immobilized and this tube has vertical slots allowing its contraction, and in that a cylindrical clamping ring is arranged around this tube, this ring having internally a conical ramp complementary to another conical ramp provided on the periphery of the tube at its upper end, and this ring being connected by traction bands to pivoting handles for actuating an actuating device making it possible to control the sliding of the ring on the tube, and as a result of tightening of this tube on the rod of the form to be immobilized.

It is advantageous that at least one of the two elements for fixing the handles to the diametrical rod is easily detachable to allow the assembly of the handle to be removed from the tube so as to facilitate the laying of a series of tools around that -this, and at its bottom.

To facilitate the description, the present invention is accompanied by two drawings in which there is shown, by way of illustration, but not limitation, an embodiment of a retaining device according to the invention.

• La figure 1 représente une vue en élévation d'une forme pour chaussure fixée sur un dispositif de retenue selon l'invention ;
• La figure 2 représente un détail d'une coupe en élévation dudit dispositif ;
• La figure 3 représente une vue en plan du dispositif de retenue pour forme interchangeable, la forme proprement dite n'étant pas représentée pour faciliter la lecture du dessin ;
• La figure 4 représente une vue en élévation partiellement en coupe dudit dispositif ; et
• La figure 5 représente une coupe en plan de la zone du dispositif dans laquelle se trouvent placées des poignées d'actionnement de celui-ci.

In these drawings:

• Figure 1 shows an elevational view of a shoe form attached to a restraint device according to the invention;
• FIG. 2 represents a detail of a section in elevation of said device;
• FIG. 3 represents a plan view of the retaining device for interchangeable form, the form proper not being shown to facilitate the reading the drawing;
• Figure 4 shows an elevational view partially in section of said device; and
• FIG. 5 represents a plan section of the zone of the device in which the actuating handles of the latter are placed.

As can be understood from reading the drawings, the retaining device for interchangeable shapes, comprises a tube 1, the interior 2 of which is hollow and which rests on the ground by means of a base 3, this tube facilitating the positioning of the actual form 4 which has a rod 5 inserted inside this tube.

Inside the tube 1, and at a suitable height depending on the length of the rod 5 of the shape 4, there is a horizontal disc 6 on which is placed a disc 7 made of elastic material such as rubber or the like. On this elastic disc bears the rod 5 of the form 4. At its upper part the tube 1 has a plurality of slots 8 intended to facilitate the reduction of its perimeter by external compression, a conical ramp 9 being provided in the vicinity of the upper end of this tube.

Around the tube 1, is placed a cylindrical ring 10 for clamping a certain height, which has an internal conical ramp 11 in the vicinity of its upper part, the conicity of this ramp being complementary to the external conicity 9 of the tube 1 in this zoned.

This cylindrical ring 10 has tabs 12 projecting in two diametrically opposite external positions. To these tabs are attached metal traction strips 13 which are placed vertically. These bands are fixed at their opposite end 14 to handles 15 of the actuating device proper, in notches 20 provided for this purpose on their lower part.

This actuating device comprises a rod 16 placed in a horizontal position, and passing through the tube 1, thanks to orifices 17 diametrically opposite, formed in the latter. The control handles 15 are fixed to this diametrical rod 16 by means of two fixing devices 18 and 19 which both make it possible to rotate these handles in a vertical plane. In addition, these fixing devices are such that it is easy to remove at least one of them, for example by means of nuts and screws, so as to allow the separation of the entire actuating device. tube 1 to be able to place around it and at its lower part, a series of tools that cobblers use in their work.

The numerical references mentioned above and on the drawings, will explain the mode of use of the device according to the invention.

To achieve the fixing of a form 4 on a tubular support 1, it suffices to introduce, into the interior thereof, the rod 5 of this form, the circular ring 10 being at this time slightly raised from the fact that the handles 15 are in a horizontal position and do not pull it.

The shape being placed in the position indicated, it suffices to press down on the two handles 15, by rotating them around the points 18 and 19, so that, thanks to this movement, the bands 13, connected to the ring circular 10 by the tabs 12, forcing said ring to slide down.

Due to the complementary conical ramps 9 and 11, the sliding of this ring 10 causes a pressure thereof on the upper periphery of the tube 1 and the existence of the slots 8 facilitates the tightening progressive from its mouth allowing the rod 5 of the form 4 to be trapped quickly and safely. This prevents any movement of this form thus ensuring a possibility of work on it. Furthermore, this work will not produce any type of problem for the retaining device, given that the rod of the form comes to bear on the disc 6 while being damped thanks to the elastic disc 7, which avoids any type of effort. on the retainer.

Claims (5)

1. A retaining device for an interchangeable shoe last intended for receiving a shoe to be repaired, comprising a vertical tube (1) adapted for receiving the stem of the last (4) to be retained, with appropriate means for immobilizing this stem inside said tube,
   characterized in that the vertical tube (1) of this device contains an horizontal disk (6) intended for supporting the stem (5) of the last (4) to be immobilized, and said tube (1) presents vertical slits (8) allowing the tube to contract, and in that a cylindrical tightening ring (10) is disposed around said tube, said ring (10) presenting inwardly a conical ramp (11) being complementary to another conical ramp (9) provided on the periphery of the tube (1) at its upper end, said ring (10) being connected by means of traction strips (13) to pivoting handles (15) provided for operating an actuating device which controls the sliding of the ring (10) on the tube (1) and hence the tightening of this tube (1) on the stem (5) of the shoe last (4) to be immobilized.
2. A retaining device according to Claim 1, characterized in that the disk (6) provided inside the vertical tube (1) carries a further disk (7) made of resilient material.
3. A retaining device according to one of the preceding Claims, characterized in that the traction strips (13) provided for pulling down the tightening ring (10) are attached to salient lugs (12) carried by said ring in diametrally opposed positions.
4. A retaining device according to Claim 3, characterized by the fact that the actuating device is formed of a rod (16) of a certain length which is placed horizontally in a diametral position through the vertical tube (1) at the requested height, the handles (15) of the device being linked to the ends of said rod (16), with the possibility to swivel these two handles along a vertical plane, said handles being provided in their lower portion with notches (20) within which are retained the traction strips (13) attached to the tightening ring (10).
5. A retaining device according to Claim 4, characterized by the fact that at least one of the two elements provided for attaching the handles (15) to the diametral rod (16) may be easily detached for making it possible to remove the handle assembly from the tube (1) so as to facilitate the setting of a series of tools around the tube and at its lower end.

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