MXPA99009167A - Device for clamping the cable in electrical outlets or plugs - Google Patents

Abstract

The present invention pertains to an electrical outlet or plug, comprising a body, which encloses a connecting jack, which can be connected to a cable, and a grip element for clamping the cable. The body and grip element are provided with complementary means, which limit the axial unthreading movement of the latter in relation to the former and for preventing their disconnection once they have been connected. A locking nut is joined to the grip element axially, with the possibility of remaining joined to the said grip element, and through this, to the body when it [nut]is completely unscrewed and removed. Means are also provided for preventing the unscrewing rotation of the nut once it has been screwed down.

Description

DEVICE FOR THE ATTACHMENT OF CABLE IN ELECTRICAL SOCKETS OR PLUGS DESCRIPTIVE MEMORY The present invention refers to electrical outlets or plugs for industrial use and / or tertiary with a device to hold the electrical cable in said devices. In general, the electrical outlets or plugs for industrial use and / or tertiary comprise a body and a female connection socket; the latter is included in the body and may have connection holes in the case of a socket, or legs in the case of a plug, which are turned towards one end of the body. The holes or legs of the socket are then connected to the corresponding electrical wires of a cable, which enters from the opposite end of the body. To avoid disconnecting the electrical wires from the socket, the cable is usually held in the body. Up to now, this fastening has been done using various systems, but almost always with a tie-type cable, that is, with a band that is placed on the body or is attached to the socket and that is fitted around the cable by means of at least one clamping screw.

However, the system is neither simple nor practical to carry out, since it involves the means inside the body and always requires the use of a tool, such as a screwdriver to hold it or to release it. On the contrary, the object of the present invention is to propose a device for holding the cable in electrical outlets or plugs, which is simpler, simpler and which can facilitate the clamping / releasing of the cable, even without the availability of tools. Another objective of the present invention is to propose a device for holding the cable in electrical outlets or plugs that conveniently use said body parts of the electrical outlet or plug for the fastening, without, that is, resorting to complex and additional components. Another objective is to propose an electrical outlet or plug that has a device to hold the cable, which also incorporates means capable of avoiding accidental separation, when the cable is attached, to prevent accidental detachment and without control of the fasteners when they are in the separation position to insert or remove the cable from the socket or plug. The mentioned objects were carried out, in accordance with the present invention, with a device that mainly includes a fastening element arranged in the body of the socket or plug, between the body and a threaded safety nut, at the inlet end of the cable; The fastening element is connected to the body by means of a conical connection and is fitted around the cable to be fastened after screwing the lock nut to the body. Likewise, all the elements are connected for convenience in axial position without transversal components, which simplifies the structure in particular and facilitates the modality. The specific details of the present invention will become more apparent from the following description with reference to the accompanying indicative drawings, but not limiting, in which: Figure 1 shows an example of an electrical outlet that is assembled and attached to a cable; Figure 2 shows a schematic view of a part of the body of the plug and the means for holding the cable in a first mode; Figure 3 shows a cross-sectional view of the device of Figure 2 with the cable when it is clamped; Figure 4 shows, in a schematic view, a part of the body of the socket or plug, the fastening element and the lock nut in another embodiment; Figure 5 shows a cross-section of the components illustrated in Figure 4, but when assembled; Figure 6 shows an axial section of the clamping device, but in a separate position, in which the nut and the fixing element are in the withdrawn position in relation to the body, and yet remain attached to the body; Figure 7 shows in a schematic view, a part of the body of the socket or plug, the fixing element and the lock nut in another embodiment; figure 8 shows the connection of the fixing element with the body of the socket or plug, according to the embodiment of figure 7; Figures 9 and 10 show perspective and side views of all the components of the socket or plug of Figure 7 assembled, respectively; and Figure 11 shows a longitudinal section of the unit of Figures 9 and 10. In said drawings, an electrical plug, consisting of a body or fastener 11 and a fastening element 12, which are joined together and include a female connection plug, which in the shown case, appears with the legs 13 (figure 1), is globally indicated as 10. The electric wires assembled in a cable 14, which enter the body 11 through the free end are connected to the female connection plug. A collar 11 ', which has on the outside a thread 15 in which a securing nut 16 is screwed and the interior has a seat 17 with conical channels 17' in the longitudinal direction, is provided at this end of the body member 11 (see figure 2).

A fixing element 18, having flexible jaws 19 extending from an annular portion 20, is mounted between the collar 11 'and the nut 16, concentrically to the cable 14. The jaws 19 have at least one conical part 19' and are turned towards the seat 17 in the collar 11 'of the body, fitting in the conical channels 17'. On the other hand, the annular portion 20 of the fixing element 18 is rotated towards, and interacts with, an annular knock surface 21 that is provided inside the nut 16. In this way, to hold the cable 14 once the plug (or socket) has been assembled and wired, it is only necessary to screw the nut 16 into the threaded collar 11 'of the body. Then, the jaws 19 of the fastener element 18 pushed by the nut 16, interact with the conical channels 17 'and are forced to fit around the cable 14 to hold it. It should be noted that the connection of the jaws 19 with the channels 17 'in the conical seat 17 prevents the rotation of the fastening with the nut when screwing it, thus avoiding to hold the cable to undue twisting. In the exemplary embodiment of Figures 4-6, the body 111 of an electrical outlet or plug is illustrated only partially in the end part, in which it has a collar 111 'with an external screwing 115 to which a nut of a screw is screwed. safety 116. A seat 117 having tapered channels 117 'in the longitudinal direction is also provided in the body 111, and a locking element 118 is mounted between the collar 111' and the nut 116 for fastening the electrical cable, which passes through of it by the center. In a manner similar to that described in Figures 1-3, the fixing element 118 has flexible jaws 119 which come from an annular portion 120 and which has a conical portion 119 ', which is intended to be connected with the conical channels 117 in the collar of the body. The annular portion 120 of the fastener element 118 is rotated towards, and interacts with, an annular strike surface 121 within the lock nut 116. In this embodiment, the fastener element 118 also has one, or preferably two, tongues dlametrically opposite 122, 123, which are parallel to the jaws 119 and are intended to be inserted into the corresponding notches 124, 125 provided on the outside of the body 111. A first tongue 122 may be in the form of a joint to the fixing element 118, which it finds half between two contiguous jaws 119, which project towards the outside of it. The second tongue 123 is in a position halfway between two adjacent jaws 119, but moves outwardly relative thereto and extends from the annular portion 120. The first tongue 122 is longer than the second tongue. 123 and correspondingly, the notch 124 intended to receive it, is larger than the notch 125 provided for the other tab 123, and the larger tab projects from the hole of the nut 116.

Two side safety teeth 122 ', 123' are provided on the sides of each tab 122, 123, respectively. Two opposing teeth 124 ', 125', which are rotated in opposite directions, are provided on the sides of each notch 124, 125, near the free end of the collar 111 ', respectively. The tongues 122, 123 of the fixing element 118 (figures 4 and 6) are inserted with force into the respective notches 124, 125 of the body 111, so that said element can slide axially in relation to the body. However, in the unscrewing direction of the locking element 118, the side teeth 122 ', 123' of the tongues 122, 123 strike against the teeth 124 ', 125' on the sides of the notches 124, 125 to stop the element itself , thus preventing the separation of the body 111 from the socket or plug. On the other hand, even the lock nut 1 6 remains attached in the axial direction of the fixing element 118 and, through it, to the body 111 of the socket or plug. Up to this point, the inner edge of the annular strike surface 121 of the nut 116 is provided to be inserted forcefully into a channel 126, which is present around a protrusion of the fastener element which is on the annular portion 120 thereof. This connection then makes it possible to turn the nut relative to the fixing element to screw and unscrew the threaded section of the collar of the body 111 and, as already mentioned, to keep the nut and fixing element attached to the body 111 and one with the other. Also, in accordance with the present invention, there is a ring gear 127 inside the nut 116, close to the hole, and a stop tooth 128, which serves to interact with the ring gear 127, is located on the outer surface of the tongue. longer 122. The stop tooth 128 has the purpose of making possible the unidirectional rotation, from left to right, of the nut 116 to screw it into the threaded collar 111 'of the body 111; and on the other hand, to avoid the opposite rotation of the nut to unscrew it. In this way, the nut 116 can be screwed to the lower part to hold the cable through the fixing element, but it can not be loosened or unscrewed without control, due to an accidental detachment of the cable. In fact, to unscrew the nut, it is necessary to do it intentionally by using a tool on the aforementioned tongue 122, pushing it inward and keeping the stop tooth 128 disconnected from the ring gear 127 when unscrewing, which in this way can only be intentional. Therefore, once the nut is screwed to hold the cable by the fixing element, it can not be unscrewed by pulling the cable out of control; and the nut and the fixing element always remain attached to the body of the socket or plug and one with the other. Also, it should be noted that a package 129, through which the cable passes and which guarantees the sealing around it under the fixing element, can be mounted inside the body without being affected by the fastening and separation means. Also in the embodiment of Figures 7-11, the body 211 of an electrical outlet or plug is illustrated only partially at its end portion, in which it has a collar 211 'with an external threaded section 215 to which a nut is screwed. 216. A seat 217, which has conical channels 217 'in the longitudinal direction that are reduced towards the interior of the body, is provided in the body 211. A fastener 218 is mounted between the collar 211' and the nut 216 for fastening the electric cable passing through the first through the center and extending through a seal 229. Here also, the fixing element 218 has flexible jaws 219 that come from an annular portion 220 and that have a conical portion 219 that serves to join the conical channels 217 'in the body collar. The annular portion 220 of the fastener 218 is also rotated toward, and interacts with, an annular strike surface 221 within the nut 216 so that the said element is pushed into the body when the nut is screwed into the threaded section 215. In In this case, the fixing element 218 has two tongues 222 to limit the unatomillamlento of the own element from the body 211. The tongues 222 are identical, diametrically opposed, placed between two contiguous jaws, and moved outward relative thereto. The tongues have the purpose of being inserted and slid into the corresponding notches 224 provided on the outside of the collar 211 'of the body 211, corresponding to two flattened sections 223. Each tongue 222 has two lateral safety teeth 222', while they are provided two opposite faces 224 'on the sides of each notch 224, near the free end of the collar 211'. The tongues 222 of the fastener element 218 are inserted into the respective notches 224 of the collar 211 'so that the element can slide axially relative to the body; however, in the direction of unscrewing the fastener 218, the side teeth 222 'of the tabs 222 strike against the faces 224' on the sides of the notches 224 to stop the element itself, thus preventing detachment from the body 211 of the socket or plug. In addition, the lock nut 216 remains attached in the axial direction to the fastener 218 and, through it, to the body 211 of the socket or plug. Thus far, the inner edge of the annular striking surface 221 of the nut 216 is provided to be strongly inserted into a channel 226, which is present around a protrusion of the fixing element resting on the annular portion thereof, and this channel it can be defined by a continuous collar or with sections, as illustrated in the drawings. Then, the connection makes possible the rotation of the nut 216 in relation to the fixing element 218 for screwing and unscrewing in the threaded section 215 of the body collar; however, the nut and the fixing element are held together with each other, and through the tongues 222, to the body of the socket or plug. According to another characteristic, the external surface of the nut 216 has a toothed cylinder or rack 227, and the body 211, on one side of the collar 211 ', in the longitudinal direction, has a ring that extends over one of the flattened side sections 223 of the collar 211 'and on the outside of the nut 216 when it is screwed into the collar itself. A stop tooth 228 '(FIGS. 7-9), which serves to connect with the toothed cylinder or external rack 227 of the nut 216, is located on the inner surface of the ring 228. The stop tooth 228' of the ring 228 has the purpose of making possible the unidirectional rotation (from left to right) of the nut for screwing it into the threaded collar 211 'of the body 211; and on the other hand, to avoid the opposite rotation of the nut to unscrew it. Therefore, the nut 216 can be screwed to the lower part to hold the cable through the fixing element, but it can not be loosened or unscrewed without control, due to an accidental detachment of the cable. In fact, to unscrew the nut, it is necessary to do it Ntentionally employing a tool in the ring 228, away from the nut to disengage the stop tooth 228 'from the external toothed cylinder 227 of the nut when unscrewing, which only in this way, can be intentional.

Claims (17)

NOVELTY OF THE INVENTION CLAIMS

1. - A device for holding the cable in electrical outlets or plugs, comprising a body that includes a connection socket that can be connected to the cable to be fastened, characterized by a fixing element (18, 118, 218), which is arranged in the body of the socket or plug therebetween and a threaded safety nut (16, 116, 216) on the input side of the cable, and in which the fixing element is connected to the body through a conical connection (17, 117, 217) and is fitted around the cable that will be fastened after screwing the lock nut to the body.

2. The device according to claim 1, further characterized in that the body has, on the input side of the cable to be fastened, a collar having an external threaded section (15, 115, 215), to which the safety nut (16, 116, 216) is screwed, and the internal conical seat, which has the purpose of interacting with the fixing element (18, 118, 218) to fit around the cable when the nut is screwed to the section External threaded

3. The device according to claim 2, further characterized in that the fixing element has the flexible jaws (19, 119, 219), which extend from an annular portion (20, 120, 220), the jaws have at least a conical part that is rotated towards and is attached to the conical seat, while the annular portion is rotated and interacts with an annular striking surface (21, 121, 221) within the securing nut (16, 116, 216).

4. The device according to claims 1 and 2, further characterized in that the fixing element (18) has jaws (19) that are rotated towards the interior of the body; the body has a conical seat (17) that interacts with the jaws, and the nut has a flat seat (21) to support the annular portion (20) of the fastener element.

5. The device according to claims 1 and 2, further characterized in that the fixing element has jaws that are turned towards the outside of the body; the body has a seat to support the annular portion, and the nut has a conical seat that interacts with the jaws of the fastener element.

6. The device according to claims 1 and 4, further characterized in that the conical channels (17 '), which have the purpose of accommodating the jaws (19) of the fixing element and prevent the rotation thereof with the safety unit , are provided on the surface of the seat (17).

7. The fastening device according to any of the preceding claims, further characterized in that the body (111) and the fixing element (118) have complementary means (122 ', 123' 124 ', 125') which act to limit the axial movement by unscrewing the latter in relation to the first and to avoid the disconnection once they have been connected; the locking nut (116) and the fixing element (118) are axially joined (121, 126) with the possibility that the nut rotates in relation to the fixing element, but remains attached to the fixing element and, through it , to the body when the nut is completely unscrewed and has been removed; the safety nut (116) and the fixing element (118) have means (127, 128) that interact to make possible a unidirectional rotation to screw and prevent the opposite rotation to unscrew when the nut is screwed to the body to hold the cable to through the fixing element.

8. The device according to claim 7, further characterized in that the fixing element (118) has two tabs (122, 123) that are parallel to the jaws (119) and have the purpose of inserting and sliding in the notches corresponding (124, 125) on the outside of the body, and the tongues have the lateral safety teeth (122 ', 123'), which have the purpose of intercepting the opposing teeth (124 ', 125') on the sides of the teeth. notches to prevent detachment of the fixing element when it is stopped in relation to the body.

9. The device according to claim 8, further characterized in that one of the tabs (122, 123) is longer than the other; the notches (124, 125) on the exterior of the body have a length that adapts to that of the tabs; the longer tongue (122) protrudes from the hole in the locknut (116).

10. - The device according to claims 7 and 8, further characterized in that the lock nut (116) has an internal collar (121) whose edge rests on an annular channel (126), which is present around a protrusion in the part upper part of the fixing element (118) for the axial connection between the fixing element and the nut.

11. The device according to claims 7 to 10, further characterized in that a toothed cylinder (127), which interacts with a stop tooth (128) in one of the tongues (122, 123), the tooth has the shape to join with the toothed cylinder and make possible the rotation of the nut only in the direction for screwing and not for unscrewing, it is provided inside the locknut (116) near the hole.

12. The device according to claim 11, further characterized in that the stop tooth (128) is on the outside of the longer tongue (122) and can be released from the toothed cylinder only by pushing the tongue in with a tool, joining the wall of the tongue protruding from the nut.

13. The fastening device according to any of claims 1 to 6, further characterized in that the body (211) and the fixing element (218) have complementary means (222 ', 224') that interact to limit the movement axial when unscrewing the latter in relation to the first one and to avoid the disconnection once they have been connected; the locking nut (216) and the fixing element (218) are axially joined (221, 226) with the possibility that the nut rotates in relation to the fixing element, and remains attached to the fixing element and, through it, to the body even when the nut is completely unscrewed and has been removed; the safety nut (216) and the fixing element (218) have means (227, 228) that interact to make possible a unidirectional rotation to screw and prevent the opposite rotation to unscrew when the nut is screwed to the body to hold the cable to through the fixing element.

14. The device according to claim 13, further characterized in that the fixing element (218) has two tabs (222) that are parallel to the jaws (219) and have the purpose of inserting and sliding in the corresponding notches ( 224) on the outside of the collar of the body, and in which the tongues have lateral safety teeth (222 '), which have the purpose of intercepting the striking faces (224') on the sides of the notches to prevent detachment of the fixing element when it is removed in relation to the body.

15. The device according to claims 13 and 14, further characterized in that the lock nut (216) has an internal collar (221) whose edge rests on an annular channel (226), which is present around a protrusion at the end of the fastener (218) for the axial connection between the fixing element and the nut.

16. The device according to claim 13 and one of claims 14 and 15, further characterized in that a toothed cylinder (227), which interacts with a stop tooth (228 ') in a ring (228) that is made in one piece with the body, it is parallel and on the outside of the collar, the tooth is shaped to join with the toothed cylinder (227) and to make possible the rotation of the nut only in the direction to be screwed and not to unscrew, it is provided on the outside of the safety nut (216).

17. The socket or plug according to claim 13, further characterized in that the fixing element (218) has two tabs (222), which are parallel to the jaws (19) and have the purpose of inserting and sliding in the corresponding notches (224) on the outside of the body collar.