ES2327427T3 - ELECTRICAL DEVICE THAT INCLUDES AN AUTOMATIC CONNECTION TERMINAL. - Google Patents

Abstract

The apparatus has an automatic connection terminal (3) placed in a joint casing (2), and having an elastic strip with an end stop opposite to a base of a rigid cage. The cage has a wall (68) in which a window for passage of an arm of an operating lever (4) is arranged. The lever has a joint trunnion (93) maintained in position around its axis by an outer surface of the wall, a transversal surface (73) and a stop surface of the casing.

Description

Electrical apparatus comprising a terminal of automatic connection

The invention relates to electrical appliances comprising an insulating box and an automatic connection terminal arranged in said box.

It is already known, particularly by request German patent number 199 49 387 and by patent application European number 0 327 703, such an apparatus that constitutes a terminal strip, whose terminals are formed by a frame rigid and by a flexible member, the rigid frame presenting a seat at the level of a driver insertion opening electric, the flexible member comprising an elastic sheet which has an end edge in front of said seat, being adapted the elastic sheet to deform in order to let the driver, when applied to the box by the opening of insertion, is inserted between the seat and the end edge of the sheet and, if the driver is requested then to retire of the box, to make the driver fit between the seat and the edge edge of the blade.

The rigid frame comprises a passage window for a portion or finger that is part of a maneuvering lever of the elastic sheet, intended to separate the latter from the seat, said lever being molded in one piece with the box and presenting an arm, one of whose ends cooperates, as if it was a hinge, with the rest of the box, while the other end carries the finger that passes through the window of the frame, being manipulated said lever by resting on the arm opposite the finger.

In each of the two documents above mentioned, the terminal frame has a seat wall in which is arranged the window of passage of the finger of the lever, while an internal surface of said wall forms said seat, connecting the outer surface of the seat wall, opposite the cable insertion opening above mentioned, to a transversely oriented surface with respect to the outer surface of the seat wall, so that the angle between this external surface and the transverse surface be outgoing.

In German patent application number 199 49 387, the transverse surface belongs to a wall that serves as stop to a conductor inserted by another insertion opening arranged in the box, opposite the insertion opening previously mentioned.

In European patent application number 0 327 703, the transverse surface belongs to a wall of an area recess that serves to hold a portion of the member flexible.

The object of the invention is to provide a electrical appliance of the same class, but simpler and more comfortable of using.

For this purpose, it proposes an apparatus electrical comprising an insulating box and a connection terminal automatic disposed in said box, which has an opening of insertion of an electric conductor according to one direction predetermined, said terminal being formed by a rigid frame and by a flexible member, the rigid frame presenting a seat at the level of said insertion opening, the member comprising flexible an elastic sheet that has an end edge in front of said seat, the elastic sheet being adapted to warp in order to let that conductor, when applied to said box by said insertion opening, it is inserted between said seat and said edge edge of the sheet and, if said driver is then requested to withdraw from said box, to make the driver fit between said seat and said end edge of the sheet, said rigid frame comprising a step window for a finger that is part of a lever maneuver of said elastic sheet, intended to separate this last of said seat, said frame presenting a wall, denominated seat wall, in which said is arranged window, while an internal surface of said wall forms said seat, the outer surface of said being connected seat wall, at an end opposite to said opening of insertion, to a transversely oriented surface with respect to said outer surface so that the angle between the surface external of the seat wall and said transverse surface be outgoing; characterized in that:

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bliss box comprises a stop surface arranged in front of the external surface of the seat wall and said surface cross; Y

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bliss lever is a different piece of said box and comprises a journal of articulation, around which it is adapted to pivot, being said journal held in position around its axis by said external surface of said seat wall, by said transverse surface and by said stop surface.

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The lever articulation journal is therefore arranged in a particularly favorable location, both in regard to the lever effect (relationship between the distance separating the articulation journal and the support point of the operator on the lever and the distance that separates the journal from joint and the point of contact with the elastic sheet), as in Regarding the orientation of the efforts exerted between the lever and the elastic sheet.

Otherwise, it will be noted that the device according to the invention takes advantage of the conformation of the frame to drive the rotating assembly of the journal together with the case.

According to the preferred characteristics, by reasons of simplicity and comfort, both in manufacturing and in the utilization:

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bliss insulating box has a housing for said terminal, provided with an opening, for the passage of said maneuvering lever, which has a T-shape; and optionally

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he transverse branch of said T-shaped opening is adapted to allow the passage of said journal of said lever; I

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he Longitudinal branch of said T-opening is bordered, in each side, by a wall that has an area on the inner side lowered to which said stop surface belongs, which is disposed at an end opposite the transverse branch of said T opening; and optionally

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a inclined surface is disposed between said recessed area and said transverse branch; I

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bliss butt surface has a concave shape; I

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bliss lever comprises a push-button element, arranged outside of said box, attached to said finger by a narrower arm than said push-button element, comprising a shoulder wall in the flange on each side of said arm, said insulating box presenting a housing for said terminal provided with a passage opening in the that said arm is housed; and optionally

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every one of said lever projection surfaces is curved, while said opening is bordered, on each side, by a nerve that has a convex edge that has the same curvature that the corresponding protrusion surface of the push-button element of the lever, in order to guide the lever with respect to the box during a pivoting movement of the lever; I

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saying finger has a convex cam surface through which it is leaning against said sheet; and optionally

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saying finger has a straight surface that is connected by a end, to one end of said cam surface, pointing its outward union; I

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saying finger has a concave surface, one of whose ends are connected to one end of said cam surface, pointing its outward union; I

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bliss lever comprises a push element attached to said finger by a narrower arm than said push-button element, said said pin, on each side of said arm, a cylindrical spike and, between the two spikes, an arc section portion whose surface external is in the extension of the external surface of each of the two spikes; I

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bliss lever comprises a push-button element arranged outside of said box, which has a limit stop surface for said push button element; and optionally

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in a limit position of said lever, in which said push-button element is resting against said stop surface, there is a recovery force of said lever; Y optionally

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bliss recovery force is less than the force to exert for move said lever from a rest position that acquires said lever in the absence of solicitation; Y optionally

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the force to exert on said lever to move from said position of resting at the end of run position decreases progressively; I

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saying rigid frame of said terminal comprises a base, two parts lateral and a cover, said laterally being arranged lateral parts and each extending from said base to said cover, said seat wall belonging to said cover; and optionally

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bliss cover comprises a transverse wall to which said transverse surface and a seat wall to which it is said transverse wall connected; I

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every one of said lateral parts comprises an outgoing end to the height of said seat wall; I

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bliss rigid frame base presents a channel, while said box comprises for said terminal a housing that has a wall provided with a reception slot of said channel; Y optionally

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bliss slot features a protrusion against which it comes to fully support a edge of said channel; I

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saying terminal comprises a flexible member that has a central section which is connected, at one end, to a curved section, which is attached, opposite to said central section, to an inclined section arranged in front of that seat; and optionally

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saying central section is connected, at each end, to a curved section which is attached, opposite to said central section, to an inclined section, of which one is arranged in front of said seat and the other in front of another seat comprising said frame; Y alternatively

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saying central section is connected, at its opposite end to said section curved, to a cross section provided with an elastic pin in front of the central section, a passage opening being arranged of a cable to be connected at the junction between the central section and the section cross; I

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bliss box includes the three terminals mentioned, each arranged in a respective housing, said lever being provided for each of said terminals; I

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bliss box presents a general parallelepipedic shape with one piece projection in the form of a wall arranged in the extension of one of their faces; and optionally

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a channel is connected to said piece in the form of a wall; I

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bliss box comprises, in the extension of said piece in the form of murete, parallel to said face in the extension in which it is located said piece in the form of a wall, on each side, a pin of guided protruding from another respective face of said box; I

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bliss box has at least one mounting notch to a wrapper support; I

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saying The apparatus further comprises a support wrap which has a butt-shaped piece in front of said terminal.

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The characteristics and advantages of the invention will be apparent from the description that follows, provided to preferred but not limiting example title, with reference to the attached drawings, in which:

- Figure 1 is a perspective view of a terminal strip according to the invention;

- figure 2 is a view similar to figure 1, but in exploded order;

- Figure 3 is a view similar to Figure 2 but at a diagonally opposite angle;

- Figures 4 and 5 are similar views, respectively, to figure 2 and figure 3, but presenting separately the box comprising the terminal strip illustrated;

- Figures 6 and 7 are, respectively, a elevation view of said box from the side seen ahead in Figure 5 and a plan view from above;

- Figure 8 is a view in hoist-cut of the box according to the line VIII-VIII of Figure 6;

- Figure 9 is an enlarged view of the detail designated by IX in Figure 8;

- Figures 10 and 11 are, respectively, a plan view from above of the terminal strip, as seen in figure 1, and an elevation view from the side that is seen at the right;

- Figure 12 is a view in elevation-cutting of the terminal strip according to the line XII-XII of Figure 10;

- Figure 13 is a perspective view that it presents separately the terminal of automatic connection that includes the terminal strip illustrated;

- Figures 14, 15 and 16 are respectively a plan view from above of said terminal, as seen in Figure 13, an elevation view from the side that is seen to the right and an elevation view from the side that is seen to the left;

- Figure 17 is a view in lifting-cutting of the terminal according to the line XVII-XVII of Figure 14;

- Figures 18 and 19 are views that present separately the lever comprising the terminal strip, illustrated, respectively, in elevation and perspective;

- Figures 20 and 21 are seen in elevation-cutting of the terminal strip, respectively, according to line XX-XX and line XXI-XXI of Figure 11;

- Figures 22 and 23 are seen in elevation-cutting of the terminal strip according to the line XXII-XXII of Figure 11 in addition, respectively, with a conductor inserted in the terminal opposite the lever and two other conductors, one of which is inserted in the terminal on the opposite side of the lever and the other is inserted in the terminal on the side of the lever; Y

- figure 24 is a view similar to figure 22 but for a terminal strip comprising a terminal block automatic connection shaped differently.

Terminal strip 1, illustrated in particular in figures 1 to 3, it comprises a box 2, three connection terminals automatic 3 and three operating levers 4.

Box 2, illustrated separately in the Figures 4 to 9, is molded plastic material, insulating in the plane electric, and generally parallelepipedic. It presents two rectangular main faces 10 and 11 and, extending from one to another of the small sides of faces 10 and 11, two sides longitudinal rectangular sides 12 and 13 and, extending from one to the other of the large sides of the main faces 10 and 11, two transverse rectangular side faces 14 and fifteen.

In addition to the six faces above mentioned, the box has a wall-shaped piece 16 and a channel 17 attached to said piece 16.

The wall-shaped piece 16 is in the prolongation of face 15, on the flange in relation to the face main 10. Two pins 18 extend the wall-shaped piece 16 on the flange of side faces 12 and 13.

Channel 17 has a U-shaped section and it is centered on the wall-shaped piece, on the flange of the same, on the opposite side of face 10.

Three housings 19 (two ends and one central), shaped in the same way and arranged in juxtaposition, are arranged in box 2. The accommodation central is separated from the end housings by two partitions 20 that extend from one side to the other main 10 and 11, as from one to the other side lateral 14 and 15. Each housing 19 is open for all its section on face 15 and retains the same contour to a wall in the background that closes housing 19 at face level 14.

Each back wall comprises, close to the face 10, two through holes 21, which narrow from the outside towards the interior of the accommodation and, next to face 11, an area recess 22 (figures 8 and 20), located on the inner side of the wall in the background, suitable for supporting the end of a terminal 3.

Each wall located between a housing 19 and the main face 11 comprises a groove 23 parallel to the sides small of the main faces, centered on the housing 19, whose first section extends from face 15 to a shoulder 24, and whose second section extends from shoulder 24 to the internal surface of the back wall, being the first section more Deep than the second leg. On each side, slot 23 is bordered by a small nerve 25.

Each wall located between an extreme housing and a longitudinal side face (respectively 12 and 13) comprises, on the outer side, a notch 26 for mounting to a wrap of terminal strip holder 1, not illustrated in the drawings, except a wall-shaped piece 105, visible in figures 22 and 23. The inner sides of these same walls, as well as the two sides of each partition 20, comprise three ribs 27, 28 and 29 parallel to the slots 23.

Each wall located between a housing 19 and the main face 10 comprises a centered T-opening (figure 7), which has a longitudinal branch 30 parallel to the small sides of the main faces 10 and 11 and a parallel cross section 31 to the large sides of the main faces 10 and 11. The branch 30 it is located in relation to the branch 31 of the side of the face 14. In each side, the branch 30 is bordered by two wall portions 32 and 33 with rectangular shape that belong to the wall located between accommodation 19 and face 10.

On the outer side of said wall, they are arranged a set of ribs 36 that run along the T-opening, with a convex edge rib 38 being at the height of each portion of the branch 31 located on either side of the branch 30, each nerve 38 being parallel to the branch 30, as well as to a inclined abutment surface 37 of the lever push element lowering, above the holes 21, at the end of the branch 30 opposite branch 31.

On the inner side, each of the portions of wall 32 and 33 has a recessed area 39 (figure 9) in the background plane that is connected, from the side that is seen on the left in the Figure 9, to an inclined surface 34 that extends until it flows into the outer side of branch 31, and which is joined, of the side that looks to the right, to a concave surface 35. As you will explain then surface 34 forms a ramp of guiding the articulation journal of a lever 4 towards the area recessed 39 during assembly, while surface 35 forms a stop of subjection of the journal. It will be noted that the lowered area 39 It is placed just in opposition to the convex nerve 38.

It will be described below in more detail the automatic connection terminal 2 illustrated in figures 13 a 17.

Terminal 3 comprises a flexible member 40 partially surrounded by a rigid frame 50.

The flexible member 40 is constituted by a elongated elastic metal band that is folded in both ends, forming a flat central section 41 joined by two sections curved 42 and 43, of profiles, respectively, U-shaped and in V-shaped, two inclined sections 44 and 45. Each curved section 42, 43 and each inclined section 44, 45 comprises in its middle part a slot that subdivides it longitudinally into two elastic sheets 44 ', 44' ', from the side shown on the right in Figure 14, and in two sheets 45 ', 45' ', from the side that is seen on the left. The flexible member 40 further comprises, in its flat central section 41, a pin 46 bent by trimmed so that it protrudes opposite side to inclined sections 44 and 45, centered with relation to its width, approximately to the height of the section inclined 45, and oriented according to one direction, globally, transversal to this section.

The frame 50 comprises a base 51, two parts sides 52 and a cover 53. Said frame 50 surrounds the member flexible 40, the base 51 being in front of the face of the section central opposite to sections 42 and 43, the lateral parts being 52 in front of the edges of the inclined section 45 and the central section 41 and the cover 53 being in front of the face of the sections inclined 44 and 45, opposite section 41.

The base 51 comprises a plate 54 and some fixing pins 55 and 56. Plate 54 has the same width that the flexible member 40 and is in contact with it approximately three quarters of its length, allowing exceed the curved section 42.

The flexible member 40 is retained on the plate 54 by means of fixing pins 55 and 56 folded towards inside the frame and through the side parts 52.

A channel 57 is arranged on the plate 54, oriented in the longitudinal direction. The inner face 58 of the channel 57 is intended to serve as a seat for a driver received in channel 57 and retained therein by end edge 49 of pin 46.

Each side part 52 forms a single block with the base 51 and comprises a support wall 59 of the cover 53 and a protruding end 60 in the extension of the wall 59 in direction of the inclined section 44.

The support walls 59 are placed at a and another part of the inclined section 45 and the part of the central section 41 located in front of the inclined section 45. Each support wall 59, on its upper part, comprises a notch of positioning 62 and a crimping notch 61 of the cover 53 in the side parts 52. As will be explained below, the edges of walls 59 placed under end 60 are inclined according to a direction transverse to the direction of insertion of a conductor, such as 102 (figure 23), and comprise in the middle of the length, in front of the inclined section 44, a pin 63 folded into the frame, which forms a bumper fin of the rigid conductor inserted.

The cover 53 comprises a seat wall 67 with a rectangular general shape, which connects transversely to each other the support walls 59, and a seat wall 68 inclined according to the direction of introduction of the driver and with general form rectangular, attached to the seat wall 67 by a wall transverse 69. The inclination of the seat wall 68 causes the angle between the outer surface 72 of the wall 68 and the outer surface 73 of the transverse wall 69 is protruding, while the angle between surface 73 and surface External 65 of wall 67 is incoming.

The wall 67, whose inner surface 70 forms, as will be seen below with the help of figure 23, a seat for the conductor placed between the wall 67 and the end edge 48 '(respectively 48' ') of the sheet 45' (respectively 45 ''), is attached to the side parts 52 by means of two projections 64 applied to notches 62 and two studs 80 set in the notches 61.

In the same way, the inner surface 71 of the inclined seat wall 68 forms a driver's seat placed between wall 68 and end edge 47 ' (respectively 47 '') of the sheet 44 '(respectively 44' ').

Bottom edges 66 of end 60 cooperate in support with the outer surface 72 of the wall 68 over the middle of its length

The wall 68 comprises, in its center, a window 74 that serves, as will be seen below, for the passage of the finger rigid lever 4, rectangular shaped, occupying approximately one third of the wall surface 68 and that It is bounded by two large sides 75 and 76, on one small side 77 opposite wall 69 and on the other small side 78, the small side 77, globally, at the same level and in prolongation  of wall 67. Each portion of wall 68, which runs along length of a large side 75, 76 of window 74, is attached longitudinally to a nerve 79 protruding towards base 51 and is butt against the 47 ', 47' 'end edges of the blades elastic 44 ', 44' 'so that the conductor inserted between a sheet and the seat is guided in its movement to the butt fin 63 through the corresponding rib 79.

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The portion of the sheet 44 '(respectively 44 '') in front of seat 71 on the side of nerve 79 continues in a tongue 81 '(respectively 81' ') in the extension of the rest of the blade 44 '(respectively 44' ') to allow the edge 47 '(respectively 47' ') approaches seat 71 without being hindered by said nerve 79.

The width of the tongue 81 '(respectively 81 '') is slightly larger than the maximum diameter of the conductors intended to be received at the automatic connection terminals.

Lever 4 will be described below. with the help of figures 18 and 19.

The lever 4 comprises a pressing element 90 joined by an arm 91 to a finger 92 and to an articulation journal 93.

The pressing element 90 comprises a wall of support 94, with rectangular shape, on the extension and on the flange on each side of arm 91, and is joined, globally, transversely to said wall, and a protrusion wall 95 shaped rectangular transversely attached to the arm 91 of the lever and in the flange of each side of said arm.

These two walls are joined laterally by two reinforcement ribs 96.

The face 97 of the protrusion wall 95 opposite of journal 93, in the mounted state, as will be seen below, It has a concave shape whose center of curvature is confused with the center of curvature of convex nerves 38 of box 2, which confuses, in turn, with the center of curvature of journal 93.

Arm 91 joins at its end, opposite the Push-button element 90, journal 93 and finger 92.

Finger 92 is bounded by a surface Convex curved cam 98, suitable for cooperating with the blades elastic, joined on one side to a straight surface 99 whose joint with cam surface 98 pointing outward of finger 92, said straight surface 99 being attached to arm 91 by a convex surface 100 whose union with the straight surface 99 and the union with arm 91 point towards the inside of finger 92 and, for the other side, to a concave surface 101 that joins finger 92 to journal 93, whose union with the cam surface 98 points towards the outside of the finger 92 and whose union with the journal 93 points towards the inside.

The journal 93 comprises, on each side of the arm 91, a cylindrical spike and, between the two spikes, a portion of arc section whose outer surface is in the prolongation of the outer surface of the two spikes.

It will be described below how the terminal automatic connection 3 and lever 4 are mounted in the box insulator 2, in particular with the help of figures 2, 3, 12 and twenty.

During the assembly phase, each terminal 3 is inserted in the direction of arrow A in a housing 19 of the insulating box 2 on the side of face 15, entering the curved section 42 of flexible member 40, first, in housing 19. Channel 57 is housed in slot section 23 located between the face 15 and the shoulder 24, the tabs 27, 28 and 29 being on each side of terminal 3 those that ensure its support and guidance in the housing 19. At this stage, terminal 3 is not placed down in housing 19 until channel 57 is placed against the highlight 24, but is placed in an intermediate position where the transverse wall 69 is at the height of the transverse branch 31 of the opening in T.

The lever 4 can then be introduced in the insulating box 2 in the direction of arrow B, crossing the finger 92 and articulation journal 93 box 2, respectively, by the longitudinal branch 30 and by the transverse branch 31 of the T-shaped opening Finger 92 then passes through window 74 of the terminal 3 and is guided by the support on cam surface 98 on each of the sheets of the inclined section 44, centered with respect to the groove that separates them, so that the surface cam 98 passes, in part, under the small side 77 of the window 74, the straight surface 99 being fully butted against the wall that it borders the small side 77. The articulation journal 93 reaches staying in the area in front of the outer surface 72 of the wall 68 and in front of the outer surface 73 of the wall 69.

Terminal 3 is placed down below to the final position (channel 57 butt against shoulder 24), then the articulation journal 93 is guided by the ramps 34 towards the lowered areas 39 and in them, until the stop surfaces 35 of the insulating box 2, housing the section folded 42, with respect to it, in the recessed area 22.

Once all terminals 3 and all levers 4 are placed in box 2, terminal strip 1 obtained is prepared to be fixed by hooking to a support wrap (it also comes from a molding of insulating material) by means of notches 26. Said wrap it comprises a piece in the form of lock wall 105, visible in Figures 22 and 23, arranged in front of guide 57, once the terminal strip is mounted on the housing, suitable to prevent displacement of terminals 3 in the reverse direction of arrow A during the operation of the levers 4.

It will be explained below how it is placed in one of the terminals of automatic connection 3 a conductor and, more precisely, the bare end of it, said conductor being of the rigid type.

The bare end 103 of a conductor 102, such as illustrated in figure 23, it is introduced into the electrical apparatus by one of the holes 21, the narrowing of the hole 21 having the effect of guiding the bare end 103 towards terminal 3, at the same time that is prevented, by said narrowing, the insertion into the insulator terminal 104 that surrounds the conductive core of the cable.

The bare end 103 finds the blade 44 ' (respectively 44 '') corresponding and causes it to bend so which lets the end 103 of the conductor be inserted, in parallel to the corresponding nerve 79, between the part of the edge of end 47 ', located at the end of the tongue 81' (respectively 81 '') of the sheet 44 '(respectively 44' '), and the wall 68. The move down the driver continues, by example, until its end leans against the wall of the corresponding fin 63. The inner surface 71 of the wall 68 located in front of the inclined section 44 forms, for the driver, a seat against which it is held by the blade 44 ' (respectively 44 '') that holds it against surface 71. Yes the driver, once installed in an automatic connection terminal, tends to withdraw from the box, that is, if it is subjected to a effort directed in the opposite direction to the sense of insertion, said driver will tend to drag the blade 44 ' (respectively 44 '') through its tongue 81 ' (respectively 81 ''), which is underpinned and, therefore, to fit it against surface 71, which will prevent retraction of the driver.

The same will happen with the insertion of the end bare 106 of a conductor between the edge of the end 48 ' (respectively 48 '') of the sheet 45 '(respectively 45' ') and the surface 70 of the wall 67.

However, it is possible to retract of the driver 102 thanks to the lever 4. For this, the operator acts on the lever of the terminal in question for the purpose of make it move from its raised position to its lowered position against surface 37, as illustrated in the central terminal of the Figure 1 and Figure 21.

The operator acts on the lever 4 exercising a force oriented, globally, transversely to the wall of support 94. When the journal 93 is held in position in the space delimited by terminal 3 and box 2, the force exerted will cause the pivoting the lever 4 and therefore a supportive action of finger 92 on the inclined section 44.

Pivoting is possible by the shape of the finger 92, allowing the concave surface 101 the pivoting action without hitting the small side 78 of window 74, allowing the convex surface 100 rounded the action of pivoting without hitting the small side 77 of the window 74.

The cam surface 98 then forces to sheets 44 'and 44' ', so that it separates them from seat 71, until the end edge 47 '(respectively 47' ') of the sheet 44 '(respectively 44' ') is no longer in contact with the driver, thanks to which, the driver can be removed from the automatic connection terminal in which it was applied.

Note that it is also possible, in case it is desired to connect a flexible conductor to terminal 3, apply the bare end of it to a connection terminal automatic 3, at the same time that the lever 4 is actuated to separate the end edge 47 '(respectively 47' ') from the sheet 44 '(respectively 44' ') of seat 71 and allow the end naked stand between them.

In the terminal strip illustrated, the arrangement of finger 92 with respect to the automatic connection terminal is such that the lever, by means of its finger, performs a joint action on sheets 44 'and 44' 'and cause simultaneously, therefore, the separation of the 47 'and 47' 'end edges of the sheets 44 'and 44' 'of seat 71.

Efforts will be described below to be performed by the operator to operate lever 4, with the help of figures 20 and 21.

Operator action on the lever causes a finger pivoting action, which tends to make the straight surface 99 of the finger move away from the small side 77 and that tends to make the concave surface 101 of the finger approach the small side 78 to carry the inclined section 44 from a first bending position (figure 20) to a second position of folded (figure 21). In the course of such displacement, the cam surface 98 remains in permanent contact with the inclined section 44 and exerts on it a force of drive, overall, normal to inclined section 44, Whatever your bending position.

In the raised position of lever 4, figure 20, the line of action of the reaction force of the inclined section 44 at the force exerted by cam surface 98 of finger 92 is, therefore, almost perpendicular to the line that joins the center of the journal 93 (pivot center) to the point of contact between the cam surface 98 and inclined section 44 (point at which reaction force applies).

In the lowered position of lever 4, figure 21, the distance between the center of journal 93 and the point of contact mentioned above is greater than in position raised, being the lever effect, therefore, smaller. Always in the lowered position of lever 4, the line of action of the reaction force of the inclined section 44 to the force exerted on cam surface 98 of finger 92 approximates the line that joins the center of the journal 93 to the point of contact between the surface of cam 98 and the inclined section 44.

In this way, in the course of the race of the lever 4, the inclined section 44 bends progressively of such that the angle formed between the line of action of the force reaction of the inclined section 44 to the force exerted by the cam surface 98 of finger 92 (which remains normal to the section 44 thanks to cam surface 98) and the line connecting the center from journal 93 to the point of contact between cam surface 98 and the inclined section 44 decreases progressively.

Therefore, the force component exerted on section 44, which comes from the reaction of the box insulator 2 on the journal 93 of the lever 4 in support against the butt surfaces 35, increases with the stroke, which entails a decrease in the intensity of the effort to be made by the operator in the course of the lever stroke up to a minimum value obtained at the end of the run, in the top position of the element lever 4 push button against stop surface 37 (reduction of the effort at the end of the race), despite the decrease in lever effect

When the exact alignment is not achieved, there is always a recovery force that does not allow a position stable in the opening: the position of alignment in the travel zone of lever 4, when the operator loosen lever 4, the elastic force of the inclined section 44 returns lever 4 to its raised position.

The significant decrease in effort in the end of the race, as well as the arrival at the top position, reassures the operator about the true opening of the terminal. This allows you to make a minor effort to keep the lever lowered during connection or disconnection of a conductor. TO then the operator has only to loosen the lever so that it is automatically found again in your position raised.

In the variant illustrated in Figure 24, the curved section 43 and inclined section 45 of flexible member 40 they are replaced by a cross section 107 provided with a elastic pin 108 in front of the central section 41, being a passage opening 110 of a conductor 106 to be connected disposed between the central section 41 and the cross section 107.

During the introduction of a conductor 106, the pin 108 bends to allow its penetration, while if it is requested that this driver be removed outside of box 2, pin 108, at its end 109, fits said driver 106 against the central section 41 which carries it, in turn, on the basis 51.

The conductor 106 can be placed in this way. on the device without having to be curved twice, as in the embodiment illustrated in the preceding figures (see more particularly figures 22 and 23).

The present invention is not limited to embodiments described and represented, but encompasses any variant of realization

Claims (30)

1. Electrical apparatus, comprising an insulating box (2) and an automatic connection terminal (3) disposed in said box (2), which has an insertion opening (21) of an electrical conductor (102) in a predetermined direction , said terminal (3) being formed by a rigid frame (50) and by a flexible member (40), the rigid frame presenting a seat (71) at the level of said insertion opening (21), the flexible member (40) comprising ) an elastic sheet (44 ', 44'') having an end edge (47', 47 '') in front of said seat (71), said elastic sheet (44, 44 ') being adapted to deform for the purpose of allowing said conductor (102), when applied to said housing (2) by said insertion opening (21), to be inserted between said seat (71) and said end edge (47 ', 47'') of the sheet (44, 44 ') and, if said conductor (102) is then requested to withdraw from said box (2), to cause the conductor (102) to fit je between said seat (71) and said end edge of the sheet, said rigid frame (50) comprising a passage window (74) for a finger (92) forming part of a maneuvering lever (4) of said sheet elastic (44 ', 44''), intended to separate the latter from said seat (71), said frame (50) having a wall (68), called a seat wall, on which said window (74) is arranged, while an internal surface (71) of said wall forms said seat, the external surface of said seat wall (72) being connected, at an end opposite to said insertion opening (21), to a cross-oriented surface (73) with respect to said outer surface (72) so that the angle between the outer surface (72) of the seat wall and said transverse surface (73) is projecting; characterized in that:

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bliss box (2) comprises a stop surface (35) arranged in front of the outer surface (72) of the seat wall (68) and of said transverse surface (73); Y

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bliss lever (4) is a different part of said box (2) and comprises a articulation journal (93), around which it is adapted to pivot, said journal being held in position around its axis by said external surface (72) of said seat wall (68), by said transverse surface (73) and by said stop surface (35).

2. Apparatus according to claim 1, characterized in that said insulating box has a housing (19) for said terminal (3), provided with an opening (30, 31), for the passage of said operating lever (4), which has a T shape. 3. Apparatus according to claim 2, characterized in that the transverse branch (31) of said T-shaped opening is adapted to allow the passage of said journal (93) of said lever (4). 4. Apparatus according to any of claims 2 or 3, characterized in that the longitudinal branch (30) of said T-opening is bordered, on each side, by a wall (32, 33) which has a recessed area on the inner side ( 39) to which said stop surface (35) belongs, which is arranged at an end opposite to the transverse branch (31) of said T-opening. 5. Apparatus according to claim 4, characterized in that an inclined surface (34) is disposed between said recessed area (39) and said transverse branch (31). 6. Apparatus according to any of claims 4 or 5, characterized in that said abutment surface (35) has a concave shape. An apparatus according to any one of claims 1 to 6, characterized in that said lever (4) comprises a push-button element (90), arranged outside said box, connected to said finger (92) by a narrower arm (91) said push-button element, comprising a shoulder wall (95) on the flange of each side of said arm (91), said insulating box (2) having a housing (19) for said terminal (3) provided with an opening of step (30, 31) in which said arm (91) is housed. Apparatus according to claim 7, characterized in that each of said projection surfaces (95) of the lever (4) is curved, while said opening (30, 31) is bordered, on each side, by a rib (38 ) which has a convex edge that has the same curvature as the corresponding protrusion surface of the push button element (90) of the lever (4), in order to guide the lever (4) with respect to the case during a pivoting movement of the lever (4). An apparatus according to any one of claims 1 to 8, characterized in that said finger (92) has a convex cam surface (98) by means of which it is resting against said sheet (44 ', 44''). 10. Apparatus according to claim 9, characterized in that said finger (92) has a straight surface (99) which is connected, at one end, to one end of said cam surface (98), pointing its connection towards the outside. 11. Apparatus according to any of claims 9 or 10, characterized in that said finger (92) has a concave surface (101), one of whose ends is connected to one end of said cam surface (98), pointing its union towards the Exterior. 12. Apparatus according to any of claims 1 to 11, characterized in that said lever (4) comprises a push-button element (90) connected to said finger (92) by an arm (91) narrower than said push-button element, said journal comprising ( 93), on each side of said arm (91), a cylindrical pin and, between the two pins, an arc section portion whose outer surface is in the extension of the outer surface of each of the two pins. 13. Apparatus according to any of claims 1 to 12, characterized in that said lever comprises a push-button element (90) disposed outside said box (2), which has a limit stop surface (37) for said element push button (90). 14. Apparatus according to claim 13, characterized in that, in an end-of-travel position of said lever (4), wherein said push-button element (90) is supported against said stop surface (37), there is a recovery force of said lever (4). 15. Apparatus according to claim 14, characterized in that said recovery force is less than the force to be exerted to move said lever (4) from a rest position acquired by said lever (4) in the absence of solicitation. 16. Apparatus according to claim 15, characterized in that the force to be exerted on said lever to move from said rest position to said limit position progressively decreases. 17. Apparatus according to any of claims 1 to 16, characterized in that said rigid frame (50) of said terminal (3) comprises a base (51), two side parts (52) and a cover (53), said sides being arranged laterally side portions and each extending from said base (51) to said cover (53), said seat wall (68) belonging to said cover (53). 18. Apparatus according to claim 17, characterized in that said cover (53) comprises a transverse wall (69) to which said transverse surface belongs and a seat wall (67) to which said transverse wall (69) is connected. 19. Apparatus according to any of claims 17 or 18, characterized in that each of said lateral parts (52) comprises a projecting end (60) at the height of said seat wall (68). 20. Apparatus according to any of claims 17 to 19, characterized in that said base (51) of the rigid frame (50) has a channel (57) while said box (2) comprises for said terminal (3) a housing (19) which has a wall provided with a slot (23) for receiving said channel (57). 21. Apparatus according to claim 20, characterized in that said groove (23) has a shoulder (24) against which an edge of said channel (57) stops abutting. 22. Apparatus according to any of claims 1 to 21, characterized in that said terminal (3) comprises a flexible member having a central section (41) that is connected, at one end, to a curved section (42), which is connected , opposite to said central section (41), to an inclined section (44) arranged in front of said
seat (71). 23. Apparatus according to claim 22, characterized in that said central section (41) is connected, at each end, to a curved section (42, 43) which is connected, opposite to said central section (41), to an inclined section ( 44, 45), of which one is arranged in front of said seat (71) and the other in front of another seat (70) comprising said frame (50). 24. Apparatus according to claim 22, characterized in that said central section (41) is connected, at its opposite end to said curved section (42), to a transverse section (107) provided with an elastic pin (108) in front of the central section (41), an opening (110) of passage of a cable (106) to be connected in the joint between the central section (41) and the transverse section (107) being arranged. 25. Apparatus according to any of claims 1 to 24, characterized in that said box (2) comprises the three terminals (3) mentioned, each arranged in a respective housing (19), said lever (4) being provided for each of said terminals (3). 26. An apparatus according to any one of claims 1 to 25, characterized in that said box has a general parallelepipedic shape with a projecting piece in the form of a wall (16) arranged in the extension of one of its faces (15). 27. An apparatus according to claim 26, characterized in that a channel (17) is connected to said wall-shaped piece (16). 28. An apparatus according to any of claims 26 or 27, characterized in that said box comprises, in the extension of said wall-shaped piece, parallel to said face (15) in the extension in which said wall-shaped piece is located , on each side, a guide pin (18) protruding with respect to another respective face (12, 13) of said box (2). 29. An apparatus according to any one of claims 1 to 28, characterized in that said box has at least one notch (26) for mounting to a support envelope. 30. An apparatus according to any one of claims 1 to 29, characterized in that it further comprises a support wrap which has a stop-shaped piece (105) in front of said terminal (3).