ES2247275T3

ES2247275T3 - PARAGUA

Info

Publication number: ES2247275T3
Application number: ES02256231T
Authority: ES
Inventors: Max Wang
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-09-09
Filing date: 2002-09-09
Publication date: 2006-03-01
Anticipated expiration: 2022-09-09
Also published as: ATE306829T1; DE60206750T2; DE60206750D1; EP1396205B1; EP1396205A1

Abstract

An umbrella includes an elongate stem (10), a notch (20) with an insert portion (22) for insertion into a concavity (115) in a top edge wall (111) of the stem (10) , a canopy (60) mounted on a mounting portion (21) of the notch (20), and a rib assembly (40) pivotally mounted to the mounting portion (21) for supporting the canopy (60). A tubular runner (30) is slidably sleeved on the stem (10) and is movable between upper and lower positions for spreading and collapsing the canopy (60) . A stretcher assembly (50) is disposed to stretch or retract the rib assembly (40). The rib assembly (40) can be brought into close proximity of the stem (10) after retraction, thereby resulting in a compact size of the umbrella for convenient storage and carrying. <IMAGE>

Description

Paraguas.Umbrella.

Esta invención se refiere a un paraguas, más particularmente a un paraguas provisto de un elemento ranurado que presenta una porción de inserción para la inserción de una porción extrema superior tubular de su vástago.This invention relates to an umbrella, more particularly to an umbrella provided with a grooved element that presents an insertion portion for insertion of a portion tubular upper end of its stem.

Con referencia a las Figuras 1 y 2, se aprecia que un paraguas convencional incluye un vástago alargado 1 y una corredera 3 que está montada a modo de manguito deslizante sobre el vástago 1 para conectarse de manera pivotante con un conjunto extensor 5 para soportar un conjunto de varillas 4. Un elemento ranurado 2 incluye una porción a modo de manguito 202 que está montada alrededor de un extremo superior del vástago 1, y una porción de montaje 203 para conectar de forma pivotante una pluralidad de varillas 401 del conjunto de varillas 4. La corredera 3 es móvil entre una posición superior para extender el conjunto de varillas 4 y una posición inferior para plegarlo. Un par de lengüetas elásticas 201 está fijado en la porción de montaje 203 y presentan extremos ganchiformes que son susceptibles de quedar retenidos en ranuras 301 formadas en la corredera 3 cuando ésta se mueve a la posición superior para retener la corredera 3 en la posición superior.With reference to Figures 1 and 2, it can be seen that a conventional umbrella includes an elongated rod 1 and a slide 3 which is mounted as a sliding sleeve on the rod 1 to pivotally connect with a set extender 5 to support a set of rods 4. An element slotted 2 includes a sleeve-like portion 202 that is mounted around an upper end of the rod 1, and a mounting portion 203 for pivotally connecting a plurality of rods 401 of the rod assembly 4. The slide 3 is mobile between an upper position to extend the set of rods 4 and a lower position to fold it. A pair of elastic tabs 201 is fixed in mounting portion 203 and they have hooked ends that are likely to remain retained in slots 301 formed in the slide 3 when it move to the upper position to retain the slide 3 in the top position

Si bien esta cooperación entre las lengüetas 201 y las ranuras 301 puede evitar lesiones para el usuario durante la operación de plegado, las varillas 401 no pueden disponerse cerca del vástago 1 debido al grosor de la porción a modo de manguito 202 una vez plegadas, como se aprecia en la Figura 2, lo que da como resultado el que el paraguas sea poco cómodo para llevar y guardar.While this cooperation between the tabs 201 and slots 301 can prevent injury to the user during the folding operation, the rods 401 cannot be arranged near of the stem 1 due to the thickness of the sleeve-like portion 202 once folded, as seen in Figure 2, which gives as result that the umbrella is not comfortable to wear and save.

Con referencia a las Figuras 8 y 9, se aprecia que un paraguas dado a conocer en la patente estadounidense nº 5.964.235 incluye un mango alargado 1, una tela 5 montada en el extremo superior del mango y un conjunto de varillas 4 para soportar la tela 5. Una corredera tubular 3 está montada a modo de manguito deslizante en el mango 1 y es móvil entre posiciones superior e inferior para extender y plegar la tela 5, respectivamente. Un conjunto extensor 6 está dispuesto para extender o retraer el conjunto de varillas 4. Un cubo 2 está formado en una sola pieza con un par de lengüetas elásticas opuestas 201 que se extienden hacia abajo. Cada lengüeta 201 presenta un extremo proximal y un extremo ganchiforme distal 202 que está forzado fuera del mango 1 en direcciones lateral y transversal. Una pared interna anular de la corredera 3 define un par de guías opuestas 301 para recibir las lengüetas 201 y retener los extremos ganchiformes 202 durante el movimiento ascendente de la corredera 3 a la posición superior.With reference to Figures 8 and 9, it can be seen that an umbrella disclosed in U.S. Patent No. 5,964,235 includes an elongated handle 1, a fabric 5 mounted on the upper end of the handle and a set of rods 4 to support the fabric 5. A tubular slide 3 is mounted as a sleeve sliding on the handle 1 and is mobile between upper positions and bottom to extend and fold the fabric 5, respectively. A extender assembly 6 is arranged to extend or retract the set of rods 4. A cube 2 is formed in one piece with a pair of opposite elastic tabs 201 extending towards down. Each tongue 201 has a proximal end and an end distal hook 202 that is forced out of handle 1 in lateral and transverse directions. An annular inner wall of the slide 3 defines a pair of opposite guides 301 to receive the tabs 201 and retain the hooked ends 202 during the upward movement of the slide 3 to the upper position.

La finalidad de la presente invención es proporcionar un paraguas en el cual las varillas puedan llevarse en estrecha proximidad de un vástago una vez plegadas para hacer el paraguas más fácil de guardar y llevar.The purpose of the present invention is provide an umbrella in which the rods can be carried in close proximity of a rod once folded to make the Umbrella easier to store and carry.

Según esta invención, el paraguas incluye un vástago alargado que se extiende a lo largo de un eje, y que presenta una porción extrema superior tubular y una porción extrema inferior mutuamente opuestas a lo largo del eje. La porción extrema superior tiene una pared marginal superior circundante que delimita una concavidad. Un elemento ranurado incluye una porción de inserción insertada en la concavidad a lo largo del eje, una porción de montaje que se extiende desde la porción de inserción a lo largo del eje, que se extiende de forma radial y hacia fuera respecto del eje, y que tiene un diámetro exterior mayor que el de la porción de inserción, y un escalón que está formado entre las porciones de inserción y montaje y que está dispuesto cerca de la pared marginal superior cuando la porción de inserción está insertada en la concavidad. La porción de montaje presenta una pared circundante exterior que rodea el eje y que presenta una pluralidad de rebajes que están desplazados angularmente unos de otros. Una tela está montada firmemente en la porción de montaje mediante un sombrerete. Un conjunto de varillas incluye una pluralidad de varillas que presentan extremos de varilla proximales que están dispuestos respectivamente en los rebajes, y extremos de varilla distales dispuestos en un lado inferior de la tela para soportarla en una posición desplegada y en una posición plegada. Una corredera tubular está montada a modo de manguito deslizante en el vástago y dispone de porciones extremas de corredera superior e inferior que se hallan respectivamente estado proximal respecto del elemento ranurado y distal respecto de éste. La corredera es móvil entre posiciones superior e inferior que corresponden respectivamente a las posiciones desplegada y plegada de la tela. Un conjunto extensor está dispuesto para interconectar el conjunto de varillas y la porción extrema superior de la corredera para extender o retraer el conjunto de varillas.According to this invention, the umbrella includes a elongated rod that extends along an axis, and that it has a tubular upper end portion and an extreme portion bottom mutually opposite along the axis. Extreme portion upper has a surrounding upper marginal wall that delimits a concavity. A grooved element includes a portion of insert inserted into the concavity along the axis, a portion mounting that extends from the insertion portion along of the shaft, which extends radially and outward from the axis, and having an outside diameter greater than that of the portion of insertion, and a step that is formed between the portions of insertion and assembly and that is arranged near the marginal wall upper when the insertion portion is inserted into the concavity. The mounting portion has a surrounding wall exterior surrounding the axis and presenting a plurality of recesses that are angularly displaced from each other. A cloth is firmly mounted on the mounting portion using a cap. A set of rods includes a plurality of rods that they have proximal rod ends that are arranged respectively in the recesses, and distal rod ends arranged on a lower side of the fabric to support it in a unfolded position and in a folded position. A tubular slide It is mounted as a sliding sleeve on the rod and has of extreme portions of upper and lower slides that are respectively proximal state with respect to the grooved element and distal to this one. The slide is mobile between positions upper and lower corresponding respectively to the unfolded and folded positions of the fabric. An extender set is arranged to interconnect the rod assembly and the upper end portion of the slide to extend or retract the set of rods.

Otras características y ventajas de la presente invención se pondrán más claramente de manifiesto a partir de la siguiente descripción detallada de la forma de realización preferida de la invención, con referencia a los dibujos anexos, en los cuales:Other features and advantages of this invention will become more clearly apparent from the following detailed description of the preferred embodiment of the invention, with reference to the attached drawings, in the which:

la Figura 1 es una vista esquemática parcial de un paraguas convencional;Figure 1 is a partial schematic view of a conventional umbrella;

la Figura 2 es una vista esquemática parcial de un elemento ranurado del paraguas convencional;Figure 2 is a partial schematic view of a slotted element of the conventional umbrella;

la Figura 3 es una vista esquemática parcial de una forma de realización preferida de un paraguas según esta invención en estado plegado;Figure 3 is a partial schematic view of a preferred embodiment of an umbrella according to this invention in folded state;

la Figura 4 es una vista en perspectiva explosionada de la forma de realización preferida en parte;Figure 4 is a perspective view exploded in part preferred embodiment;

la Figura 5 es una vista esquemática parcial de la forma de realización preferida en un estado desplegado;Figure 5 is a partial schematic view of the preferred embodiment in an unfolded state;

la Figura 6 es una vista parcialmente en sección que muestra un fiador de corredera; yFigure 6 is a partially sectioned view which shows a sliding latch; Y

la Figura 7 es una vista en sección que muestra una porción de la forma de realización preferida en un estado plegado.Figure 7 is a sectional view showing a portion of the preferred embodiment in a state creased.

Con referencia a las Figuras 3 y 4, se aprecia que la forma de realización preferida de un paraguas según la presente invención comprende un vástago alargado 10, un elemento ranurado 20, un sombrerete 70, un conjunto de varillas 40, una tela 60, una corredera tubular 30, un conjunto extensor 50 y un fiador de corredera.With reference to Figures 3 and 4, it can be seen that the preferred embodiment of an umbrella according to the The present invention comprises an elongated rod 10, an element slotted 20, a cap 70, a set of rods 40, a fabric 60, a tubular slide 30, an extension assembly 50 and a catch of slide.

El vástago alargado 10 se extiende a lo largo de un eje, y está dotado con una porción extrema superior tubular 11 y una porción extrema inferior 12 mutuamente opuestas a lo largo del eje. La porción extrema superior 11 tiene una pared marginal superior circundante 111 que presenta periferias exterior e interior 112, 113 mutuamente opuestas en dirección radial respecto del eje, una superficie de pared circundante interior 114 que se extiende de la periferia interior 113 a lo largo del eje hacia la porción extrema inferior 12 para delimitar una concavidad 115, y una superficie de pared circundante exterior 116 que se extiende de la periferia exterior a lo largo del eje hacia la porción extrema inferior 12 para rodear la superficie de pared circundante interior 114.The elongated rod 10 extends along a shaft, and is provided with a tubular upper end portion 11 and a mutually opposite lower end portion 12 along the axis. The upper end portion 11 has a marginal wall surrounding upper 111 presenting outer and inner peripheries 112, 113 mutually opposite in radial direction relative to the axis, an interior surrounding wall surface 114 extending from the inner periphery 113 along the axis towards the portion lower end 12 to delimit a concavity 115, and a outer surrounding wall surface 116 extending from the outer periphery along the axis towards the extreme portion bottom 12 to surround the interior surrounding wall surface 114

El elemento ranurado 20 incluye una porción de inserción 22 que es susceptible de insertarse en la concavidad 115 a lo largo del eje a través de la periferia interior 113, una porción de montaje 21 que se extiende de la porción de inserción 22 a lo largo del eje, que se extiende radialmente y hacia fuera respecto del eje, y cuyo diámetro exterior es mayor que el de la porción de inserción 22, y un escalón 23 que está formado entre las porciones de inserción y de montaje 22, 21 y que está a tope contra la pared marginal superior 111 cuando la porción de inserción 22 está insertada en la concavidad 115. Con referencia nuevamente a la Figura 7, un pasador sujetador 24 se extiende a través de la porción de inserción 22 y el vástago 10 en una dirección radial respecto del eje para fijar la porción de inserción 22 al vástago 10. La porción de montaje 21 presenta una pared circundante exterior 213 que rodea el eje y que tiene una pluralidad de rebajes 214 que están desplazados angularmente unos de otros. Cada rebaje 214 se extiende radialmente y hacia dentro respecto del eje para terminar en una superficie interior 215 que está substancialmente a ras de la periferia exterior 112 de la pared marginal superior 111 del vástago 10. Un orificio roscado 212 está formado en la porción de montaje 21.The slotted element 20 includes a portion of insert 22 which is likely to be inserted into concavity 115 a along the axis through the inner periphery 113, a portion assembly 21 extending from insertion portion 22 to shaft length, extending radially and out respect of the axis, and whose outer diameter is greater than that of the portion of insert 22, and a step 23 that is formed between the portions of insertion and assembly 22, 21 and that is butt against the wall upper marginal 111 when insertion portion 22 is inserted into concavity 115. With reference again to the Figure 7, a fastener pin 24 extends through the portion insertion 22 and the rod 10 in a radial direction with respect to the shaft for attaching the insertion portion 22 to the stem 10. The portion Mounting 21 has an outer surrounding wall 213 surrounding the axis and which has a plurality of recesses 214 that are angularly displaced from each other. Each recess 214 extends radially and inwards relative to the axis to end in a inner surface 215 which is substantially flush with the outer periphery 112 of the upper marginal wall 111 of the stem 10. A threaded hole 212 is formed in the mounting portion twenty-one.

La tela 60 está montada en la porción de montaje 21. El sombrerete 70 está provisto de un perno roscado 71 que se atornilla en el orificio roscado 212 para sujetar la tela 60 firmemente entre el sombrerete 70 y la porción de montaje 21.The fabric 60 is mounted on the mounting portion 21. The cap 70 is provided with a threaded bolt 71 which is screw into threaded hole 212 to hold fabric 60 firmly between the cap 70 and the mounting portion 21.

El conjunto de varillas 40 incluye una pluralidad de varillas 41, cada una de las cuales tiene un extremo de varilla proximal 411 que está dispuesto en un rebaje respectivo 214, y un extremo de varilla distal que se extiende desde el extremo de varilla proximal 411 radialmente respecto del eje y que está dispuesto en un lado inferior de la tela 60 para soportar ésta en una posición desplegada y en una posición plegada.The rod assembly 40 includes a plurality of rods 41, each of which has a rod end proximal 411 which is arranged in a respective recess 214, and a end of the distal rod that extends from the end of proximal rod 411 radially with respect to the axis and which is arranged on a lower side of the fabric 60 to support it in a deployed position and in a folded position.

La corredera tubular 30 está montada a modo de manguito deslizante en el vástago 10, y presenta porciones extremas de corredera superior e inferior 32, 33 que son respectivamente proximal y distal respecto del elemento ranurado 20. La corredera 30 presenta además una superficie de pared interior tubular 34 que está dispuesta de manera que establece un contacto deslizante con la superficie de pared circundante exterior 116 de la porción extrema superior 11 del vástago 10 entre posiciones superior e inferior que corresponden respectivamente a la posición desplegada y a la posición plegada de la tela 60, como se aprecia en las Figuras 5 y 3, y una superficie de pared exterior tubular 36 que es opuesta a la superficie de pared interior tubular 34. La superficie de pared interior tubular 34 define un par de guías 35, cada una de las cuales se extiende de la porción extrema superior de corredera 32 hacia la porción extrema inferior de corredera 33 y cada una de las cuales está separada radialmente de la superficie de pared circundante exterior 116 de la porción extrema superior 11 del vástago 10.The tubular slide 30 is mounted as a sliding sleeve on the stem 10, and has extreme portions of upper and lower slider 32, 33 which are respectively proximal and distal with respect to the grooved element 20. The slide 30 it also has a tubular inner wall surface 34 that is arranged so that it establishes a sliding contact with the outer surrounding wall surface 116 of the end portion upper 11 of the stem 10 between upper and lower positions than correspond respectively to the deployed position and the folded position of the fabric 60, as seen in Figures 5 and 3, and a tubular outer wall surface 36 that is opposite to the tubular inner wall surface 34. The wall surface tubular interior 34 defines a pair of guides 35, each of the which extends from the upper end portion of slide 32 towards the lower end portion of slide 33 and each of the which is radially separated from the wall surface surrounding exterior 116 of the upper end portion 11 of the stem 10.

El conjunto extensor 50 está dispuesto para interconectar el conjunto de varillas 40 y la porción extrema superior de corredera 32 de la corredera 30 para extender o retraer el conjunto de varillas 40, con lo cual se sitúa la tela 60 en la posición desplegada o en la posición plegada cuando se desplaza la corredera 30 a la posición superior o a la posición inferior, respectivamente.The extender assembly 50 is arranged to interconnect the rod assembly 40 and the end portion upper slide 32 of slide 30 to extend or retract the set of rods 40, whereby the fabric 60 is placed in the unfolded position or in the folded position when the sliding 30 to the upper position or the lower position, respectively.

Con referencia a la Figura 6, el fiador de corredera incluye un par de lengüetas elásticas 25, cada una de las cuales tiene un extremo fijo que está sujeto al escalón 23 del elemento ranurado 20, y un extremo ganchiforme 251 que se extiende hacia la porción extrema inferior 11 del vástago 10. Los extremos ganchiformes 251 de las lengüetas 25 están forzados fuera del vástago 10 en dirección lateral y transversal respecto del eje. El fiador de corredera incluye además un par de ranuras 31 formadas en la superficie de pared exterior tubular 36 de la corredera 30. Cada ranura 31 se extiende radialmente y hacia dentro hacia la superficie de pared interior tubular 34 y comunica con su respectiva guía 35. Cuando se desplaza la corredera 30 hacia arriba por fuerza manual a la posición superior para desplegar la tela 60, las guías 35 cooperan con los extremos ganchiformes 251 de las lengüetas 25 contra la acción elástica de las lengüetas 25. Secuencialmente, los extremos ganchiformes 251 sobresalen de las ranuras 31 por medio de las fuerzas elásticas de las lengüetas 25 y quedan retenidos en ellas.With reference to Figure 6, the surety Sliding includes a pair of elastic tabs 25, each of the which has a fixed end that is subject to step 23 of the slotted element 20, and a hooked end 251 extending towards the lower end portion 11 of the stem 10. The ends hooks 251 of the tabs 25 are forced out of the rod 10 in lateral and transverse direction with respect to the axis. He Sliding catch also includes a pair of grooves 31 formed in the outer tubular wall surface 36 of the slide 30. Each slot 31 extends radially and inwards towards the surface of tubular inner wall 34 and communicates with its respective guide 35. When slide 30 is moved up by hand force to the upper position to unfold the fabric 60, the guides 35 cooperate with the hooked ends 251 of the tabs 25 against the elastic action of the tongues 25. Sequentially, the hooked ends 251 protrude from slots 31 by means of the elastic forces of the tongues 25 and are retained in they.

Cuando se desea plegar el paraguas, se presionan los extremos ganchiformes 251 de las lengüetas 25 hacia dentro para desacoplarlos de las ranuras 31. Como se aprecia en la Figura 7, puesto que el elemento ranurado 20 está conectado al vástago 10 de manera que la porción de inserción 22 está insertada en la concavidad 115, y puesto que las superficies interiores 215 de la porción de montaje 21 están substancialmente a ras de la periferia exterior 112 de la porción extrema superior 11 del vástago 10, las varillas 41 pueden quedar dispuestas cerca del vástago 10 después de efectuada la operación de plegado, dando como resultado con ello un tamaño compacto del paraguas para hacerlo fácil de guardar y llevar. Adicionalmente, el usuario habitualmente sujeta la corredera 30 durante la operación de plegado, con lo cual se impide que el usuario sufra daños.When you want to fold the umbrella, press the hooked ends 251 of the tabs 25 inwardly to decouple them from slots 31. As seen in Figure 7, since the slotted element 20 is connected to the rod 10 of so that the insertion portion 22 is inserted in the concavity 115, and since the inner surfaces 215 of the mounting portion 21 are substantially flush with the periphery exterior 112 of the upper end portion 11 of the stem 10, the rods 41 may be arranged near the stem 10 after the folding operation has been carried out, resulting in a Compact umbrella size to make it easy to store and carry. Additionally, the user usually holds the slide 30 during the folding operation, which prevents the User suffers damage.

Claims

1. Umbrella comprising:

an elongated rod (10) extending to the along an axis, and presenting a tubular upper end portion (11) and a lower end portion (12) mutually opposite to what along the axis, said upper end portion (11) presenting a surrounding upper marginal wall (111) presenting some outer and inner peripheries (112, 113) mutually opposite in radial direction relative to the axis, and a wall surface surrounding interior (114) extending from said periphery interior (113) along the axis towards said end portion bottom (12) to delimit a concavity (115);

a slotted element (20) that includes a portion assembly (21) presenting an outer surrounding wall (213) that surrounds the axis and that is provided with a plurality of recesses (214) that are angularly displaced from each other, each of said recesses (214) extending radially and towards inside with respect to the shaft to end on an inner surface (215);

a fabric (60) mounted on said mounting portion (twenty-one);

a cap (70) arranged to hold said fabric (60) to said mounting portion (21);

a set of rods (40) that includes a plurality of rods (41), each of which has a proximal rod end (411) that is arranged in one respective of said recesses (214), and a distal rod end extending from said proximal rod end (411) radially with respect to the axis and which is arranged on a lower side of said fabric (60) to support said fabric (60) in a position unfolded and in a folded position;

a tubular slide (30) mounted as a sliding sleeve in said rod (10) and which has some extreme portions of upper and lower slider (32, 33) that are respectively proximal and distal with respect to said element grooved (20), said slider (30) being mobile between upper and lower positions corresponding respectively to the deployed and folded positions of said fabric (60); Y

an extender assembly (50) arranged to interconnect said rod assembly (40) and said upper end portion of slide (32) to extend or retract said rod assembly (40), whereby said fabric (60) is brought to the unfolded position or folded position when said slider (30) is moved to the upper position or the lower position, respectively, characterized in that:

said slotted element (20) further includes

an insertion portion (22) configured for inserted into said concavity (115) along the axis through said inner periphery (113) and extending from said portion of assembly (21) along the axis, said portion of insertion (22) radially and inwardly with respect to the axis, and whose outer diameter is smaller than that of said mounting portion (21), Y

a step (23) formed between said portions of insertion and assembly (22, 21) and arranged near said wall upper marginal (111) when said insertion portion (22) is inserted into said concavity (115).

2. Umbrella according to claim 1, characterized in that said step (23) of said slotted element (20) is abutted against said upper marginal wall (111) when said insertion portion (22) is inserted into said concavity (115), said inner surface (215) of said mounting portion (21) being substantially flush with said outer periphery (112) of said upper marginal wall (111) of said rod (10).

3. Umbrella according to claim 1 or claim 2, further characterized by an elastic tongue (25) having a fixed end attached to said step (23) of said grooved element (20), and a hooked end (251) which is extends towards said lower end portion (11) of said rod (10) when said insertion portion (22) is inserted into said concavity (115), said hook-shaped end (251) being forced out of said rod (10) in lateral direction and transversal with respect to the axis,

said rod (10) having a surface of outer surrounding wall (116) extending from said outer periphery (112) along the axis towards said portion lower end (12) to surround said wall surface surrounding interior (114),

said slide (30) including a surface of tubular inner wall (34) that is arranged in contact sliding with said outer surrounding wall surface (116) of said rod (10), defining said inner wall surface tubular (34) a guide (35) extending from said portion upper sliding end (32) towards said extreme portion lower slide (33) and which is radially separated from said outer surrounding wall surface (116) so that it receives said tongue (25) inside.

4. Umbrella according to any of the preceding claims, characterized in that said cap (70) cooperates with thread with said mounting portion (21) of said slotted element (20) to hold said fabric (60) between them.

5. Umbrella according to any one of the preceding claims, further characterized by a fastener pin (24) extending through said insertion portion (22) and said rod (10) in a radial direction relative to the axis for fixing said portion of insertion (22) to said rod (10).

6. Umbrella according to any of claims 3 to 5, characterized in that said slide (30) includes a tubular outer wall surface (36) that is opposite to said tubular inner wall surface (34) and has a groove (31) which extends radially and inwardly towards said tubular inner wall surface (34) and communicates with said guide (35) in a position such that said hook-shaped end (251) will be forced to protrude and be retained in said groove (31 ) once said tongue (25) is forced into said guide (35).