MXPA98006493A - Pivot latch mechanism, with an interconnectable latch arm and ratchet, in a section set - Google Patents

Abstract

A disconnecting assembly includes a mounting structure, having electrical contacts, upper and lower, a disconnecting tube, an actuating element, mounted to the tube and movable from a non-actuated position to an actuated position, and a latching mechanism of pivot, which has an eleme

Description

PIVOT LOCK MECHANISM. WITH AN INTERCONNECTABLE LATCH ARM AND RATCHET. IN A SEPARATOR SET ANTECEDEHTE8 OF THE INVENTION Field of the Invention The present invention relates, generally, to an electronic disconnector and, more particularly, it relates to a disconnector assembly employing a pivot latch mechanism, having a latch arm and a ratchet, which can be interconnected , releasably, with each other, to retain, in a releasable manner, the latch mechanism in a closed position, in relation to an electronic disconnector tube of the disconnector assembly.

Description of the Prior Art High voltage power distribution systems are typically comprised of a main supply line, which is connected to a number of branched or lateral lines. Normally, the main line is protected near its source of power by an automatic device that closes again or a circuit breaker that closes again, which can be operated to disable the entire system downstream of this closing device, if currents of a certain magnitude are detected.

The reclosing automatic devices and the reclosing circuit breakers are particularly useful to make it possible to leave transient fault currents free, after a time, the reclosing device can again energize the circuit. However, if the fault current conditions remain, this reclosing device, after one or more attempts to re-energize the circuit, will stop the operation and cause the distribution system to remain in an inactive state, until attended by the repair personnel. As a result of these operational problems, electronic disconnectors were developed, which count the number of times the reclosing device opens and closes the circuit. After a specified number of current flow periods or "attempts", the electronic disconnector disables the lateral line during a subsequent inactive interval, when the reclosing device opens, if overcurrent conditions are detected in the lateral lines protected by the disconnector. For further discussion of the electronic disconnectors, reference is made to U.S. Patent Nos. 4,768,010 and 4,795,996 to Brown et al., U.S. Patent No. 4,935,715 to Popeck and U.S. Patent No. 5,612,661 to Twenter and collaborators, all of which were assigned to the assignee of the present invention. Typically, as disclosed in these patents, the electronic disconnector is carried by an insulated mounting structure, secured to a service pole or the like. The mounting structure supports a superior electrical contact and a lower electrical contact, spacing of the upper contact. This lower electrical contact includes a pair of spaced, hook-shaped portions in which the electronic disconnector is carried. The electronic disconnector typically includes a tube assembly, a pivot latch mechanism and an actuator mechanism. This tube assembly is an elongated, electrically conductive structure having an upper terminal and a lower terminal. The upper terminal of the tube assembly is received, releasably, by the upper electrical contact of the mounting structure, when the tube assembly is placed in a closed, current conducting position. The pivot latch mechanism is provided between the lower terminal of the tube assembly and the lower electrical contact of the mounting structure, to retain the tube assembly in the closed position, when the pivot latch mechanism is in the closed position in relation to the tube assembly. The actuator mechanism is mounted within the tube assembly and can be operated to actuate the pivot latch mechanism from the closed position to a release position, to release the coupling tube assembly with the upper electrical contact and enable the tube assembly to move from the closed, current conducting position, to an open position that breaks the circuit. For example, the actuator mechanism of the cited patent of Twenter et al. Has an elongated actuator element with a lower end which, when the actuator mechanism acts, moves and engages a lever arm of the pivot latch mechanism, which causes the lever arm and the pivot latch mechanism rotate relative to the lower electrical contact and the tube assembly, from the closed position to the release position, which causes the tube assembly to move downwardly mobile and in distance from the upper electrical contact, in order to interrupt the electrical contact are the same. The pivot latch mechanism of the aforementioned patents also includes a die member, rigidly connected to the lever arm and pivotally mounted between the hook-shaped portions of the lower electrical contact, while, at the same time, also pivotally engaging to the lower end of the tube assembly, which enables the oscillatory movement of the trunnion element, between the closed and release positions, relative to the tube assembly, during the simultaneous movement of oscillation of the trunnion element, with respect to the portions Hook. The pivot latch mechanism further includes a spring contact, secured to the lower end of the tube assembly, which is normally coupled to a raised portion of the trunnion member, when the tube assembly is in the closed position carrying current , to facilitate the flow of the current from the upper electrical contact by the length of the tube assembly and from there through the stump element to the upper electrical contact. The latch mechanism still further includes a spring latch, which normally retains the trunnion element in the closed position, relative to the tube assembly, with the end of the underlying lever arm and next to the lower end of the elongate actuating element. One end of the spring latch is secured to the lower surface of the trunnion element, while the other end of the spring latch has a high backrest which can be releasably connected to a shaping cavity, provided on the lower surface of the lower terminal of the tube assembly. Once the actuator mechanism has been pivoted and moved the pivot latch mechanism to the release position and the tube assembly of the disconnector has assumed the open position, a repair worker removes the disconnector from the mounting structure, while it is placed on the floor, using a long tool to reach the disconnector and raise it from the pair of hooked portions of the lower electrical contact, on which it is normally carried. The actuator mechanism of the disconnector, while on the ground, is readjusted by the repair worker, pivotally moving the stump member of the pivot latch mechanism, from the release position to the closed position, relative to the tube assembly. In the locked position of the pivot latch mechanism, the spring latch, mounted on the trunnion element, is again coupled to the lower end of the tube assembly, to prevent reverse pivoting of the pivot latch mechanism to the release position, in relation to the tube assembly, when the repair worker resets or reinstalls the disconnector to its closed position, which carries current, with the lower and upper contacts on the insulated mounting structure. To readjust or reinstall the disconnector, the repair worker uses the same long tool to couple its upper end with the stump element and then lift the disconnector up to the mounting structure, by placing the stump element between the hook-shaped portions of the lower electrical contact with the trunnion element supported on the respective hook portions. The repair personnel then removes the upper end of the long tool from the stump element and engages the upper end of the long tool with the upper end of the tube assembly, the repair personnel then moves the long tool to thereby pivot the tube assembly (and the stump element with it) in relation to the lower electrical contact, until the upper terminal of the tube assembly is pressurized in engagement with the upper electrical contact of the mounting structure. A problem has been experienced in carrying out the adjustment procedure described above. During such readjustment or reinstallation of the disconnector on the mounting structure, the spring latch of the pivot latch mechanism sometimes fails to retain the pivot latch mechanism in the locked position, relative to the tube assembly. More particularly, during the pivoting of the tube assembly by the repair personnel, who uses a long post, the spring latch has the tendency to be decoupled from the backrest in the lower terminal of the tube assembly, which results in the assembly The tube fails to be received by and readjusted with the upper electrical contact in the current-carrying closed position, thus preventing the flow of current from the upper electrical contact for the length of the tube assembly and through the trunnion element to be resumed. lower electrical contact. As a result of this failure by the spring latch, additional time and effort has to be spent by the repair personnel in removing the disconnector from the mounting structure, moving the stump element relative to the tube assembly to place the latch mechanism. of pivot in the locked position, and then replace the disconnector again in the mounting structure, in order to try again to achieve the readjustment of the tube assembly to the closed position in relation to the upper electrical contact. Consequently, there is a need for a pivot latch mechanism, designed to overcome the aforementioned problem in the prior art, without introducing any new problem in its place.

SUMMARY OF THE INVENTION The present invention provides a pivot latch mechanism, designed to satisfy the aforementioned need, avoiding the drawbacks of the prior art. The pivot latch mechanism of the present invention employs a latch and ratchet arm, which can be releasably interconnected with each other, which provide a solution to the aforementioned problem, which is simple to construct and uses a minimum number of pieces, thus avoiding undue complexity and improving operational reliability. The pivot latch mechanism eliminates the need for a repair that spends valuable time and effort, having to repeat the installation steps necessary to achieve the successful readjustment of the electronic disconnector. Therefore, the present invention is directed to a switch assembly which comprises: (a) a mounting structure, having spaced electrical contacts, upper and lower; (b) a disconnector tube element, having spaced apart ends, top and bottom; (c) an actuating element, mounted to the disconnecting tube element and having a lower end that can be moved from a non-actuated position to an actuated position, relative to the lower end of the disconnecting tube element; and (d) a pivot latch mechanism, disposed between the lower electrical contact and the lower end of the disconnector tube element. This pivot latch mechanism includes: (i) a pivot element, mounted to the lower electrical contact and the lower end of the disconnecting tube element, to undergo a relative pivot movement between the latching and releasing positions, (ii) ) a latch arm, attached to the pivot member and extending outwardly therefrom, to undergo a pivoting movement therewith, between the locked and release positions, the latch arm has an outer end e (iii ) a ratchet, carried on the lower end of the actuator element, for being subjected to movement therewith, this ratchet has an open recess on at least one side of the ratchet, the outer end of the latch arm is releasably fitted with the ratchet inside his recess. The external end of the latch arm interconnects the pawl within its recess and thus keeps the pivot element in the latch position, when the actuator element is not in the action position and the pivot element is in the position of the bolt. The outer end of the latch arm disengages the ratchet recess when the actuator member moves from the non-actuated position to the actuated position and the pivot member thus moves from the locked position to the release position. The movement of the ratchet with the actuator element, from the non-driven position to the driven position, causes the latch arm and the pivot element with it to be pivotally moved away from and disengages the ratchet, thus allowing the upper end. of the disconnector tube element moves from a closed position to an open position relative to the upper electrical contact. More particularly, the upper end of the latch arm on the pivot member preferably, but not necessarily, has a bifurcated configuration. The ratchet is in the form of a body having an end position, upper and lower, spaced apart, an opening defined in the upper end portion that mounts the ratchet to the end of the actuator member and the recess defined in at least one side portion of the body that extends between its end, top and bottom portions. In a preferred embodiment, the body is substantially symmetrical about a central axis of the body that is coincident with the longitudinal axis of the actuator element and the recess is an annular groove, formed in a circumferential body wall and extending symmetrically around the body. the central and longitudinal axes, so that the external end of the latch arm interconnects with the annular groove in any rotational position of the pawl and the actuator element about the longitudinal axis. In an alternative embodiment, the recess is formed in only one side portion of the body in an asymmetric relationship to the longitudinal axis of the actuator element, so that the recess must be correctly aligned with the outer end of the latch arm, before interconnecting this arm of latch with the ratchet. In the alternative embodiment of the ratchet, the recess intersects the longitudinal axis of the actuator element, while in the preferred embodiment of the ratchet the annular groove surrounds, but does not intersect, the longitudinal axis of the actuator element. These and other features and advantages of the present invention will become apparent to those skilled in the art from reading the following detailed description, when taken in conjunction with the drawings, where an illustrative embodiment of the invention is shown and described.

BRIEF DESCRIPTION OF THE DRAWINGS In the following detailed description, reference will be made to the accompanying drawings, in which: Figure 1 is a side elevational view of a switch assembly, incorporating a pivot latch mechanism of the present invention, this pivot latch mechanism is shown in a locked position, with a sectioning tube element of the assembly in a closed position; Figure 2 is a view similar to that of Figure 1, except that it shows the pivot latch mechanism in a release position, with the disconnector tube element in an open position; Figure 3 is an enlarged, side elevational view of the pivot latch mechanism and the disconnecting member element of the assembly in Figure 1; Figure 4 is a front elevational view of the pivot latch mechanism and the disconnector tube element, as seen along line 4-4 in Figure 3; Figure 5 is an enlarged, side elevational view of a pivot or stump member, and the latch arm of the pivot latch mechanism in Figure 3; Figure 6 is a top plan view of the stump member and latch arm, as viewed along line 6-6 in Figure 5; Figure 7 is a front elevation view of the stump member and latch arm, as seen along line 7-7 in Figure 5; Figure 8 is a longitudinal sectional view of the stump member and the latch arm, taken along line 8-8 in Figure 7; Figure 9 is a rear elevation view of the stump member and latch arm, as seen along the line 9-9 in Figure 5; Figure 10 is an enlarged, side elevational view of a first ratchet embodiment of the pivot latch mechanism of Figure 3; Figure 11 is a top plan view of the pawl, as seen along line 11-11 in Figure 10; Figure 12 is a longitudinal sectional view of the pawl, taken along line 12-12 in Figure 11; Figure 13 is a top plan view of a lower coupler of the disconnector tube, as viewed along the line 13-13 in Figure 14; Figure 14 is a side elevational view of the lower coupler, as viewed along line 14-14 in Figure 13; Figure 15 is an enlarged, side elevational view of the pivot latch mechanism of the present invention, with the latch arm and ratchet interconnected with each other in the locked position of Figure 1; Figure 16 is an enlarged, side elevational view of the pivot latch mechanism, with the latch arm and pawl disengaged from each other in the release position of Figure 2; Figure 17 is a side elevational view of a second embodiment of the ratchet of the pivot latch mechanism of the present invention, shown at the lower end of an elongate actuator element in the member of the disconnector tube, shown in fragmentary form; Figure 18 is a fragmentary longitudinal sectional view of the disconnecting tube element, taken along line 18-18 of Figure 17, showing an end elevation view of the pawl of Figure 17; Figure 19 is an enlarged, side elevational view of the ratchet of Figure 17; Figure 20 is a bottom plan view of the pawl, as seen along line 20-20 in Figure 19; and Figure 21 is a top plan view of the pawl, as seen along line 21-21 in Figure 20.

DETAILED DESCRIPTION OF THE INVENTION In the following description, similar reference characters designate similar or corresponding parts, through the various views. Likewise, in the following description it will be understood that the terms "above", "bottom", "top", "bottom", "right", "left" and the like, are words of convenience and should not be interpreted as limiting terms. Referring to the drawings and particularly to Figures 1 to 4, there is illustrated a switch assembly, which is designated generally at 10, incorporating the present invention, as will be described below. This disconnector assembly 10 basically includes a mounting structure 12 and an electronic disconnector 14. The mounting structure 12 of the assembly 10 basically includes an insulator 16 and an arm 18 there joined together, to secure the mounting structure 12 to a service pole or Similary. The mounting structure 12 also includes an upper electrical contact 20 having a conductive arm 22, facing downward, with a concave retainer, and a lower electrical contact 24, spaced from the upper electrical contact 20 and mounted on an opposite end region of the insulator 16. The lower electrical contact 24 has a pair of spaced apart portions 26, in the form of a hook (only one is shown) in which the electronic disconnector 14 is carried. This electronic disconnector 14 of the assembly 10 basically includes a pipe element 28 disconnector and a resettable actuator mechanism 30, mounted on the disconnector tube element 28. This disconnector element 28 of the electronic disconnector 14 is a substantially hollow, elongated, electrically conductive structure having a terminal or upper end 32 and a terminal or lower end 34, spaced from the upper end 32. The upper end 32 of the element 28 of the disconnector tube is received in the concave retainer of the arm 22 facing downwards from the upper electric contact 20. As will become clear later, the element 28 of the disconnector tube can be moved between the closed position, which carries current, shown in Figure 1, and a separate, open position, shown in Figure 2. The element 28 of the disconnector tube and the resettable actuator mechanism 30 of the electronic disconnector 14 can take any suitable form, such as, by way of example, those of the Twenther et al. patent, cited above, the description of which is incorporated herein by reference. As described in the Twenter et al. Patent, the actuator mechanism 30 is mounted within the member 28 of the disconnecting tube and can be operated to initiate the release of the disconnecting element 28 from the electrical and physical coupling, in the upper electrical contact 20, to thereby allow the element 28 of the disconnector tube to move from the closed position to the open position. More particularly, the actuator mechanism 30 includes an elongate rod-like actuating element, mounted for axial movement along its longitudinal axis L, within the member 28 of the disconnector tube and the suitable control element (not shown, known Conventionally, disposed in the element 28 of the disconnector tube and coupled to the actuator element 36. The control element can be operated in a known manner to initiate the release of the element 28 of the disconnector tube, causing the movement of the actuator element 36 from an internal position. not actuated, better seen in Figure 15, in which the lower end 36A of the elongated actuator member 36 is positioned adjacent the lower end 34 of the member 28 of the disconnector tube, to an external actuated position, better seen in Figure 16, in which the lower end 36A of the elongated actuator member 36 is located a short distance outward away from the lower end 34 of the element 28 of the disconnector tube. Referring to Figures 1 to 16, the electronic disconnector 14 of the assembly 10 also includes a pivot latch mechanism 38 of the present invention, provided between the lower end 34 of the member 28 of the disconnector tube and the lower electrical contact 24 of the mounting structure 12 for retaining this element 28 of the disconnecting tube in engagement with the upper electrical contact 20 and releasing this element 29 from the disconnecting tube thereof, so as to allow the element 28 of the disconnector tube to move from the closed position of Figure 1 to the open position of Figure 2. More particularly, the pivot latch mechanism 38 is pivotally connected to a lower coupler 40 in the lower end 34 of the element 28 of the disconnector tube and is also pivotally supported between and by the spaced apart portions 26, hook-shaped from the lower electrical contact 24 in the mounting structure 12. This pivotal latch mechanism 38 is operable to move between a locked position, shown in Figures 1, 3 and 4, and a release position, shown in Figure 2, to correspondingly prevent and allow movement of the disconnecting member 28 between the closed position of Figure 1 and the position open of Figure 2. Pivot bolt mechanism 38 basically includes a pivot element in the form of a stump member 42, disposed substantially between the pair of hooked portions 26 of the lower electrical contact 24 and has a pair of cylindrical pins 44, which extend horizontally outward in the opposite directions and which are received in the respective hook portions 26 of the lower electrical contact 24. The stump member 42 is pivotally connected by means of a third cylindrical pin 46, extending between and through a pair of tabs 48, projecting from the lower coupler 40 onto the lower end 34 of the tube element 28. disconnector A pivot axis A, defined by the third pin 46, extends parallel to the sentral axis C, defined by the pair of pins 44 to enable pivotal or oscillating movement of the stump member 42 with recession to the element 28 of the sessional tube. During the simultaneous oscillation movement of the trunnion member 42 relative to the hook portions 26 of the lower electric strut 24. As best seen in Figures 15 and 16, the pivot latch mechanism 38 also includes a counter staple. spring 50, secured to the lower blower 40 at the lower end 34 of the element 28 of the spaced tube, which normally makes up the contaste are a portion of the stump member 42, located adjacent to the pivot pin 46, sucking the member 28 of the tube is in its serrated or worn bearing position, as shown in Figure 1, to facilitate the flow of the sorptive from the sontasto eléstriso superior 20 along the length of the element 28 of the tube and from there through the stump element 42 to the lower step of the stencil 24. The mesanism 38 of the pivot latch also includes a latch arm 52, preferably fixed to and extending from the element 42 stump and a pawl 54 mounted and carried on the lower end 36A of the elongate pinching element 36. The latch arm 52 is subjected to a pivoting movement is the stump element 42, between the locked and releasing positions. The pawl 54 is subjected to an axial movement, they are the clamping element 36 between the internal positions not impacted and externally clamped. The latch arm 52 and the ratchet 54 are interspersed with each other, since the pivot bolt mesanism 38 is in the locked position, they are relayed to the element 28 of the session tube, as shown in FIG. 15, while the arm 52 The latch and the ratchet 54 are de-consigned to each other, the mesanism 38 of the pivot latch being in the releasing position are relasion to the element 28 of the tube, as shown in FIG. the pivot latch mesanism 38 so that, once the messaging mechanism 30 is "triggered" in a known manner, the lower end 36A of the elongated actuating element 36 moves outwardly from the non-impacted internal position of FIG. 15 to the clamped external position of Figure 16 and by means of the pawl 54 causes the latch arm 52 of the trunnion member 42 of the pivot bolt mesanism 38 to swing away and disengage from the pawl 54 in order to allow the member 28 of the latch. The sectioning tube is pivotally displaced downwards and away from the upper electric section 20 to open the lateral line. The force exerted by the elongated spreader element 36 does not directly impart movement to the member 28 of the tube of speech to an isolated position, but merely move and astute the pivot bolt mesanism 38, so that an oversensed spring or gravity force are operable to subsist to push the element 28 of the tube to move away from the upper sonaste 20 sontasis, opening thus the sirsuite and impeding the flow of current through the cross-section switch 14. The elongated pinching element 36, once "fired", immediately locates the stump element 42 about a pin terser 46 and simultaneously simultaneously the stump element 42 ossile are relasion to the gansho 26 portions of the lower sonastasis sontaste 24, as shown in part 2 in Fig. 2, thus resulting in the element 28 of the session tube moving downwardly away from the upper sonaside sontaste 20 to the open position. All the force exerted by the messaging mechanism 30 is directed to the latch arm 52 of the stump member 42, by means of the engaging member 36 and the pawl 54, which causes the latch arm 52 and the stump member 42 to move. pivotally away from element 28 of the tube. The pivoting movement of the stump member 42 downwardly away from the member 28 of the spacer tube, while the instantaneous downward movement of this member 28 of the spacer tube, away from the upper serestrus sontasis 20, is a force (assisted by gravity or another way) which is sufficient to guide the displacement of the element 28 of the session tube to the open position displaced away from Figure 2. More particularly, refer to Figures 5 to 9, 15 and 16, an outer end 52A of the arm 52 of latch in the preferred stump member 42, but not necessarily, has a bifurcated configuration. Referring to Figures 10 to 12 and 15 to 20, the pawl 54 is in the form of a body 56 having end, top and bottom, spaced, 58, 60, an opening 62 defined in the upper end portion. 58, which allows the firm fit of the pawl 54 to the lower end 3 A of the elongated pinching member 36 and a recess 64 defined in at least one side portion 66 of the body 56, which extends between its end, top and bottom porsiones, 58 , 60. The opening 62 defines a sentral axis D of the body 54, which is only the longitudinal axis L of the elongated pinching member 36. In a preferred embodiment of the ratchet 54, shown in Figures 10 to 12, 15 and 16, the body 56 is substantially symmetrical about the sentral axis D and the recess 64 is in the form of an annular groove 68, formed in a side wall of the sonorous portion of the body 56, extending symmetrically about the sentral axis D, so that the former end 52A of the latch arm 52 will visually and intersparently surround the ratchet 54 within the annular groove 68 at its any ratchet position 52 of the pawl 52 and the clutch member 36 about the longitudinal axis L. In an alternative embodiment of the pawl 54, shown in FIG. Figures 17 to 20, the body 56 is asymmetrical are relative to the sentral axis D and the recess 64 is formed in only one side portion 66 of the body 56, also in an asymmetrical recession to the longitudinal axis L of the spider element 36, so that the recess 64 must be aligned if the outer end 52A of the latch arm 52 before intersigning the latch arm 52 is the ratchet 54. Also in the alternative embodiment of the ratchet 54, it can be seen that the recess 64 intersperses the longitudinal axis L of the gripping element 36, while in the preferred embodiment of the ratchet 54, the annular groove 68 surrounds, but not interspersed, the longitudinal axis L of the element grinder 36. In summary, they are respectable to any mode, the recess 64 of the pawl 54 opens at least on a side portion t of the pawl 54. The outer end 52A of the ratchet arm 52 releasably fits is the pawl 54 inside his recess 64, so that the outer end 52A of the interstage latch arm 52 is the pawl 54 within its recess 64 and thus keeps the stump member 42 in the locked position sucking the elongate pinching element 36 is in the internal non-impacted position and the The stump member 42 is in the locked position, while the outer end 52A of the latch arm 52 is disengaged from the recess 64 of the pawl 54, the spreader member 36 is formed, the pawl 54 moves from the internal position not impacted to the postion externally clamped and the stump element 42 is thus moved from the locked position to the releasing position. The movement of the pawl 54 is the gripping member 36 from the internal position not impacted to the externally engaged position, but the outer end 52A of the latch arm 52 and the stump member 42 are to move pivotally away from and disengage of the ratchet 54, thus allowing the upper end 32 of the element 28 of the sitter tube to move from the open to the open position are relased to the upper sonostic sontaste 20. It is thought that the present invention and its advantages will be apparent from the previous re-sipion and it will be evident that there may be several sambios in it without departing from the spirit and scope of the invention, or insulting all its material advantages, and the formerly dessrita form is merely a preferred or exemplary modality thereof.

Claims (20)

1. CLAIMS 1. A sonjunto sessionador, the sual somprende: (a) a estrustura of assembly, that has sontastas eléstricos, superior and inferior, spaced; (b) a spacer tube element, having end, upper and lower, spased; (s) a gripping element, mounted to the tube-ducting element and having a lower end, which can be moved from a non-squeezed position to a biased position, are recessed to the lower end of the scissor tube element; and (d) a pivot latch mesanism, disposed between the lower sonastosis sontaste and the lower end of the tube member, this pivot latch mesanism includes: (i) a pivot element, mounted to the lower sonastasis sontasis and to the bottom end of the tube member, to undergo a relative pivot movement, between the locked and release positions, (ii) a latch arm, attached to the pivot member and extending outwardly therefrom to undergo a movement of pivot are he, between the locked and release positions, and (iii) a ratchet, carried on the lower end of the actuating element to perform are a movement, this latch arm can be adjusted, releasably, are the ratchet , so that the latch arm is interspersed are the ratchet and thus keep the pivot element in the locked position, suando the friction element is in the position not impacted and the pivot element is in the locked position, as long as this latch arm is disengaged from the ratchet, the squeezing element moves from the non-impacted position to the impacted position and the pivot element thus moves from the locked position to the latched position. releasing position, the movement of the ratchet is the engaging element from the non-impacted position to the impacted position so that the latch arm and the pivot element are moved pivotally away from and disengaged from the ratchet, thus allowing the The upper end of the scissor tube element is moved from a serrated position to an open position and is reslurried to the upper stenosis sontaste.
2. 2. The set, as defined in claim 1, wherein the pawl has a recess defined, which is open in at least one side portion of the pawl.
3. 3. The set, as defined in claim 2, wherein the latch arm has an external end that can be adjusted, releasably, is the ratchet within its recess, so that the outer end of the latch arm interspersed with the latch. ratchet inside its recess and thus keep the pivot element in the locking position, sucking the gripping element is in the unattached position and the pivot element is in the locked position, while the outer end of the latch arm is decontaminated from the ratchet recess, sonforme the spreader element moves from the unseeded position to the impacted position and the pivot element thus moves from the locked position to the release position.
4. 4. The set, as defined in claim 3, in which the pawl is a body having end portions, upper and lower, spaced, this recess is defined in at least one side portion of the pawl, which extends between its pawls. End, top and bottom porsiones.
5. 5. The set, as defined in claim 4, wherein the pawl has an aperture defined in the upper end portion of the body that fits this pawl to the end of the elongate striker member.
6. 6. The set, as defined in claim 4, in which the body is substantially symmetrical about a sentral axis of this body, which is so insensitive is a longitudinal axis of the spider element.
7. 7. The set, as defined in Claim 6, wherein the recess is an annular groove, formed in a side wall of the spherical member and extending symmetrically about its sentral axis and the longitudinal axis of the spreader element, such that the end The outer ring of the interstage latch arm is the annular groove at any angular position of the pawl and the spreader element around the longitudinal axis.
8. 8. The set, as defined in claim 7, wherein the annular groove surrounds but not interspersed the longitudinal axis of the spreader element.
9. 9. The set, as defined in claim 7, in which the latch arm has an outer end is a bifurcated sonfiguration, adapted to surround, at least partially, and interfit is the ratchet body, within its annular groove.
10. 10. The assembly, as defined in claim 4, in which the body is in a recession asymmetrical to the longitudinal axis of the gripping element, so that the recess must be aligned cor- rently are the outer end of the latch arm, before intersoning the arm of latch are the ratchet.
11. 11. The set, as defined in claim 10, wherein the recess intersestates is the longitudinal axis of the spreader element.
12. 12. A sonjunto sessionador, sual somprende: (a) a structure of assembly, which has contastos eléstrisos, superior and inferior, spasiados; (b) a session tube element, having ends, upper and lower, spased; (s) a gripping element, mounted to the tubing tube element and having a lower end, which can be moved from a non-grasped position to an acted position, are recessed to the lower end of the tube member; and (d) a pivot latch mesanism, disposed between the lower sonastosis sontaste and the lower end of the tube member, this pivot latch mesanism includes: (i) a pivot element, mounted to the lower sonastasis sontasis and to the lower end of the tube member, to undergo a relative pivot movement, between the locked and releasing positions, (ii) a latch arm, attached to the pivot element and extending out of the same to undergo a pivot movement is he, between the locked and releasing positions, and (iii) a ratchet, carried on the lower end of the spreader element to perform is a movement, the ratchet has a defined recess, the outer end of the arm of latch can be adjusted, releasably, are the ratchet, inside the recess, so that the outer end of the latch arm is interspersed are the ratchet inside its recess and thus maintain the pivot element in the locked position, the pushing element is in the non-impacted position and the pivot element is in the locked position, while the external end of the latch arm disconnects the ratchet recess, according to the engaging element it moves from the non-impacted position to the acted position and the pivot element thus moves from the locked position to the releasing position, the ratchet movement being the penetrating element from the non-impacted position to the impacted position sausa The external end of the latch arm is pivotally pivoted away from the ratchet, thus allowing the upper end of the typing tube to move from a serrated position to an open posi- tion is re-casting to the upper sonastrict sontass.
13. 13. The set, as defined in claim 12, wherein the ratchet recess is defined therein and opens, at least in a lateral portion, of the pawl.
14. 14. The set, as defined in claim 13, in which the pawl is a body having ends, upper and lower portions, spasms, this recess is defined in at least one lateral portion of the pawl, which extends between its pawls. End, top and bottom porsiones.
15. 15. The set, as defined in claim 14, wherein the pawl has an opening defined in the upper end portion of the body that fits this pawl to the end of the elongate pinch member.
16. 16. The set, as defined in claim 13, in which the body is substantially symmetrical about a sentral axis of this body, which is so insensitive is a longitudinal axis of the spider element.
17. 17. The set, as defined in claim 16, wherein the recess is an annular groove, formed in a side wall of the spherical member and extending siperatively about its sentral axis and the longitudinal axis of the spreader element, such that the The external end of the interstage latch arm is the annular groove at its angular position on the ratchet and the actuator around the longitudinal axis.
18. 18. The assembly, as defined in claim 17, wherein the annular groove surrounds, but does not intersect, the longitudinal axis of the spreader element.
19. 19. The set, as defined in claim 17, in which the latch arm has an outer end is a bifurcated sonfiguration, adapted to encircle, at least partially, and interfit is the ratchet body, within its annular groove.
20. 20. The set, as defined in claim 14, in which the body is in an asymmetrical recession to the longitudinal axis of the gripping element, so the recess must be aligned sorpresent are the outer end of the latch arm, before intersisting this arm of latch are the ratchet, the recess intersters the longitudinal axis of the assaulting element. SUMMARY OF THE INVENTION A sonator session includes a mounting estrustura, which has upper, lower and upper sonastas, a sectioning tube, a spreader element, mounted on the tube and which can be moved from a non-impacted position to an impacted position, and a Pivot latch mesanism, which has a pivot element, a latch arm and a ratchet. This pivot element is mounted to the lower sonastasis sontaste and to the lower end of the tube, to perform a relative pivot movement, between the locking and releasing positions. The latch arm is fixedly attached to the pivot member and extends outwardly therefrom and performs a pivot movement therein, between the latching and releasing positions. The trin-quete is carried on the lower end of the actuator element and performs a movement is it. The latch arm has an outer end that can be adjusted within a recess in the ratchet, which is open in at least one of its latches. The external end of the latch arm intersperses the pawl within its recess, sucking the clamping element is in the non-impacted position and the pivot element is in its locked position. Such interconnection tends to keep the pivot element in the locked position. The outer end of the latch arm is disengaged from the ratchet recess when the engaging element moves from the unfastened position to the impacted position and the pivot member moves from the locked position to the release position. The movement of the ratchet is the driving element from the non-thrusting position to the impacted position for the latch arm to move pivotally away and disengage from the ratchet, allowing the upper end of the tube to move from a serrated to an open position. , they are relasidn to sontasto eléstriso superior.