JP2012221805A - Connector with wire cover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a wire from being caught when mounting a wire cover.SOLUTION: In a connector 1 with wire cover, having a wire cover 20 mounted on a rear portion of a connector 2, in the vicinity of a wire extraction portion 11 on the rear face of the connector 2, a guide protrusion 15 is provided for bending a plurality of wires in a bundled state to an upper direction along an outer face and a front direction, by hanging a plurality of wires W extracted from the wire extraction portion to a backward direction. At a position apart from the guide protrusion, a wire holding portion 16 is provided for guiding the wires forward, by receiving the reactive force of the wires, bent by being hung to the guide protrusion, to a restoration direction by a restriction wall 16b, and in this state, by holding the wires in the bundled state intact.

Description

  The present invention relates to a connector with a wire cover.

  For example, Patent Document 1 discloses a connector with an electric wire cover in which an electric wire cover is attached to the rear portion of the connector. The electric wire cover in this case is mainly provided for the purpose of guiding and leading out in a predetermined direction while protecting a plurality of electric wires drawn from the rear part of the connector.

  FIGS. 17 to 22 show a conventional connector 101 with a wire cover, FIG. 17 is a perspective view showing a state before a terminal is attached to the connector housing, and FIG. 18 is a case where a terminal with an electric wire is attached to the connector housing. FIG. 19 is a perspective view showing a state in which the connector is configured, and the electric wires drawn backward from the rear part of the connector are bundled and brazed so as to go in a predetermined direction, and FIG. 19 covers the rear part of the connector in the state of FIG. FIG. 20 is a perspective view showing a state in which the lower half of the wire cover is locked to the upper half and the electric wire cover is attached to the rear part of the connector. It is. FIG. 21 is a perspective view showing a state in which several wires are scattered when the wires are brazed as shown in FIG. 18, and FIG. It is a perspective view which shows the state which has bitten the loosened electric wire between the electric wire cover and the connector when it was attached to.

  As shown in FIG. 17, the connector 101 with an electric wire cover includes a connector 102 including a connector housing 110 and a plurality of terminals 130, and an electric wire cover 120 that is attached to the connector 102 later. A wire lead-out portion 111 is provided on the rear surface of the connector housing 110, and a rear end opening 112 of each terminal accommodating chamber is arranged in the wire lead-out portion 111. When the terminal 130 is inserted into each terminal accommodating chamber of the connector housing 110, the electric wire W connected to the terminal 130 is drawn backward from the electric wire drawing portion 111. An electric wire cover 120 is attached to the rear portion of the connector 102 for the purpose of guiding and guiding these electric wires W in a predetermined direction while protecting them.

  In this case, the wire cover 120 includes an upper half 121 that is first attached to the rear portion of the connector 102, and a lower half 122 that is connected to the upper half 121 via a hinge 123 so as to be opened and closed. Yes.

  When assembling the connector 101 with an electric wire cover, first, as shown in FIGS. 17 and 18, the terminal 130 connected to the terminal of the electric wire W is inserted into each terminal accommodating chamber of the connector housing 110 from the rear end opening 112. . When all the terminals 130 are inserted and the connector 102 is assembled, the electric wire W drawn backward from the rear portion of the connector 102 is bent and brazed in a direction to be guided by the electric wire cover 120.

  In this state, as shown in FIGS. 19 and 20, the upper half 121 of the wire cover 120 is attached to the rear portion of the connector 102, the wire W is aligned with the outlet 125 of the wire cover 120, and the corrugated tube 128. The lower half 122 is rotated to the closed position while the upper half 121 and the lower half 122 are locked together. Thereby, the connector 101 with an electric wire cover is completed.

JP-A-9-199220

  By the way, in the conventional connector 101 with an electric wire cover, as shown in FIGS. 21 and 22, when attaching the electric wire cover 120 to the connector 102, the electric wire cover 120 while brazing the electric wire W extending backward from the connector 102. However, since the connector 102 has nothing to regulate the electric wire W, the electric wire W is scattered (D1 circle part in FIG. 21), and the electric wire W1 is separated when the electric wire cover 120 is fixed. May be bitten between the wire cover 120 and the connector 102 (D2 circle in FIG. 22). When such a biting of the electric wire W occurs, the work must be re-executed, resulting in an increase in assembly cycle time.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a connector with an electric wire cover that can reduce the assembly cycle time without causing the electric wire to be bitten when the electric wire cover is attached. Is to provide.

The above object of the present invention can be achieved by the following constitution.
(1) In the connector with an electric wire cover attached to the rear portion of the connector, an electric wire cover that is guided and guided in a predetermined direction while protecting a plurality of electric wires drawn from the rear portion of the connector,
A connector with an electric wire cover, wherein the connector is provided with an electric wire restricting portion that brazes and restricts a plurality of electric wires drawn from the rear portion of the connector so as to face in the predetermined direction.

(2) On the rear surface of the connector, a wire lead-out portion for pulling out the plurality of wires toward the rear is provided,
A first wire is bent in the direction along the outer surface of the connector in a bundled state by hooking a plurality of wires drawn backward from the wire drawing portion in the vicinity of the wire drawing portion. The wire restriction part is provided,
The reaction force in the restoring direction of the electric wire bent by being hooked on the first electric wire restricting portion is received by the restricting wall at a position away from the first electric wire restricting portion, and the plurality of electric wires are in that state. The connector with an electric wire cover according to (1), wherein the second electric wire regulating portion that guides the electric wire in the predetermined direction by holding the bundle is provided.

  (3) A lock arm that engages with a lock portion of the mating connector when the mating connector is fitted is provided on the upper portion of the connector, and the wire cover covers the part of the lock arm. The connector with an electric wire cover according to the above (1) or (2), characterized in that is extended.

  (4) The second electric wire restricting portion includes two halved cylindrical bodies each having a concave portion for holding an electric wire, and one of the halved cylindrical bodies can be rotated by a hinge portion with respect to the other halved cylindrical body. The connector with electric wire cover according to any one of (1) to (3), wherein the electric wire is restricted by being coupled and fixing the two half cylinders in a closed state.

  (5) The connector with an electric wire cover according to (4), wherein the one half cylinder that is rotatable is formed with a backlash preventing protrusion that presses against the connector end in the closed state. .

  According to the connector with the wire cover having the configuration of the above (1), the connector is provided with the wire restricting portion that brazes and restricts the plurality of wires drawn from the rear portion of the connector so as to face in a predetermined direction. Therefore, it is possible to prevent the electric wires from being scattered and to solve the problem of the electric wires being caught when the electric wire cover is attached. Therefore, the assembly cycle time can be reduced.

  According to the connector with the wire cover having the configuration of the above (2), the plurality of wires pulled out from the rear portion of the connector are hooked and bent on the first wire restricting portion, and the wires are further bent by the second wire restricting portion. By holding while being regulated, the electric wire can be fixed while preventing the variation, so that the electric wire cover can be easily attached.

  According to the connector with the wire cover configured as described in (3) above, a part of the lock arm can be concealed by the extension portion of the wire cover, so that it is possible to prevent the lock arm from being inadvertently released. Become.

  According to the connector with an electric wire cover having the configuration (4), the electric wire fixing tape becomes unnecessary, and the electric wire can be fixed to the connector.

  According to the connector with an electric wire cover having the configuration (5), the electric wire restricting portion of the electric wire cover can be fixed so as not to be loose, and deformation of the electric wire restricting portion can be prevented.

  According to the present invention, since the electric wire restricting portion provided in the connector can prevent the electric wire from being scattered, the problem of the electric wire biting when the electric wire cover is attached can be solved, and the assembly cycle time can be reduced. Reduction can be achieved.

It is a lineblock diagram of a connector with an electric wire cover of an embodiment of the present invention, and is a perspective view showing a state before attaching a terminal to a connector housing. It is a top view which shows the state which comprised the connector by mounting | wearing the connector housing with the terminal with the electric wire. It is a top view which shows the state currently pulled out while brazing the electric wire pulled out from the rear part of a connector in the horizontal direction. (A) and (b) shows that the wire drawn from the rear part of the connector is hooked on the guide protrusion which is the first electric wire regulating part, and is bundled upward and forward along the outer surface of the connector. It is a top view and a rear view showing a state where the wires are held and fixed in a bundled state by being bent and extended as it is, and further passing through the wire passage groove of the wire holding portion which is the second wire regulating portion in that state. . It is a perspective view which shows the state which is going to mount | wear with the electric wire cover in the rear part of a connector in the state which hold | maintained and fixed the electric wire by the 1st, 2nd electric wire control part. It is a perspective view which shows the state which attached the electric wire cover to the rear part of the connector, and completed the connector with an electric wire cover. It is a top view of the completed connector with an electric wire cover. It is VIII-VIII arrow sectional drawing of FIG. It is a top view which shows the connector of the comparative example when there is no electric wire control part. It is a top view for description of a problem at the time of attaching an electric wire cover to the connector of FIG. It is a side view of the state where an electric wire was fixed to a connector with an electric wire cover of a 1st embodiment. It is a disassembled perspective view before the cover mounting | wearing of the connector with an electric wire cover of 2nd Embodiment. FIG. 13 is a perspective view after the cover of the connector of FIG. 12 is mounted and before the lower extension plate is closed. It is a perspective view of the state where the lower extension board of the connector of Drawing 13 was closed. It is the perspective view which looked at the connector of FIG. 14 from the back side. It is a side view of the connector of FIG. It is a block diagram of the conventional connector with an electric wire cover, and is a perspective view which shows the state before attaching a terminal to a connector housing. It is a perspective view showing a state in which a connector is configured by attaching a terminal with an electric wire to the connector housing, and the electric wires drawn backward from the rear part of the connector are bundled and brazed toward a predetermined direction. is there. It is a perspective view which shows the state which attached the upper half body of the electric wire cover to the connector so that the rear part of the connector of the state of FIG. 12 might be covered. It is a perspective view which shows the state which locked the lower half body of the electric wire cover to the upper half body, and attached the electric wire cover to the rear part of the connector. FIG. 13 is a perspective view showing a state in which some electric wires are scattered when the electric wires are brazed as shown in FIG. 12. FIG. 16 is a perspective view showing a state in which a separated electric wire is caught between the electric wire cover and the connector when the electric wire cover is attached to the rear portion of the connector in the state shown in FIG. 15.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a configuration diagram of a connector with an electric wire cover according to the embodiment, and is a perspective view showing a state before a terminal is attached to the connector housing, and FIG. 2 is a connector formed by attaching a terminal with an electric wire to the connector housing. FIG. 3 is a plan view showing a state, FIG. 3 is a plan view showing a state where an electric wire drawn out from the rear part of the connector is pulled out while being laterally brazed, and FIGS. 4A and 4B are drawn out from the rear part of the connector. The hooked wire is hooked on the guide protrusion which is the first wire restricting portion, and is bent and extended in a bundled state along the outer surface of the connector in the upward and forward directions. FIG. 5 is a plan view and a rear view showing a state in which the electric wires are held and fixed in a bundled state by passing them through the electric wire passing grooves of the electric wire holding portion which is the restricting portion, and FIG. 5 is a diagram showing the electric wires by the first and second electric wire restricting portions. Holding and fixing FIG. 6 is a perspective view showing a state where an electric wire cover is about to be attached to the rear part of the connector in a state where FIG. Is a plan view of the completed connector with an electric wire cover, and FIG. 8 is a cross-sectional view taken along the line VIII-VIII in FIG.

  As shown in FIG. 1, the connector 1 with an electric wire cover includes a connector 2 comprising a connector housing 10 and a plurality of terminals 30 (only one is shown as a representative in FIG. 1) accommodated in the connector housing 10, It is comprised from the electric wire cover 20 with which the connector 2 is mounted | worn later. The electric wire cover 20 is provided for the purpose of guiding and leading in a predetermined direction while protecting the plurality of electric wires W drawn from the rear part of the connector 2.

  The rear surface of the connector housing 10 is provided with a wire lead-out portion 11 for drawing out a plurality of wires extending rearward from the terminal 30. The rear end opening 12 of each terminal accommodating chamber is laterally (laterally) in the wire lead-out portion 11. Are arranged in a row. A lock arm 13 is provided at the center of the upper surface of the connector housing 10 in the width direction so as to engage with a lock portion of the mating connector housing when fitted to the mating connector.

  As shown in FIGS. 2 to 4, when the terminal 30 (see FIG. 1) is inserted into each terminal accommodating chamber of the connector housing 10, the electric wire W connected to the terminal 30 is drawn backward from the electric wire drawing portion 11. It is. On the upper side of the rear end opening 12 of the terminal housing chamber on the rear surface of the connector housing 10 (corresponding to the vicinity of the wire lead-out portion 11), it is positioned in the vicinity of the rear end opening 12 on the right end of the terminal housing chamber as viewed from the rear surface side. Then, by hooking the plurality of electric wires W drawn from the rear part of the connector 2, the first electric wire restriction is bent in the upward and forward directions along the outer surface of the connector 2 in a bundled state. A guide protrusion 15 is provided as a part. The guide protrusion 15 protrudes rearward from the rear end 11a of the wire lead-out portion 11 so that the wire W can be reliably hooked.

  The bundle of the wires W extended from the upper direction toward the front direction along the outer surface of the connector 2 by being hooked and bent by the guide protrusions 15 returns to the original form by the restoring force of the wires W themselves. . Therefore, the electric wire holding portion 16 as the second electric wire regulating portion is provided on the right side when viewed from the rear surface side of the upper surface of the connector 2 so that the force in the restoring direction can be received. The electric wire holding portion 16 is configured by a restriction wall 16b having an inverted L-shaped cross section when viewed from the rear, and an electric wire that opens toward the center in the width direction of the connector 2 and penetrates in the front-rear direction inside the restriction wall 16b. A through groove 16a is provided.

  The guide protrusion 15 and the electric wire holding part 16 are positioned so that the electric wire W extended forward along the upper surface of the connector 2 by being hooked and bent on the guide protrusion 15 is fit in the electric wire passage groove 16a of the electric wire holding part 16. There is a relationship, and the guide protrusion 15 and the electric wire holding part 16 are in a separated position. Then, by passing the electric wire W bent by the guide protrusion 15 through the electric wire passage groove 16a of the electric wire holding portion 16, the electric wire W can be held without being scattered and guided forward. Be able to.

  On the other hand, the electric wire cover 20 is a bag-shaped cover main body portion 21 that covers the entire rear surface of the connector 2 and an electric wire holding portion cover that is continuously provided so as to protrude forward to the right side of the cover main body portion 21 when viewed from the rear. It has the part 22 and the extension plate 23 extended to the front side of the electric wire holding | maintenance part cover part 22. As shown in FIG. The cover main body 21 is formed to have a size that covers not only the rear surface of the connector 2 but also the upper surface, side surfaces, and lower surface of the rear half of the connector 2 so that the release operation is not performed carelessly. Therefore, a part of the lock arm 13 can be covered. However, a notch 26 is provided on the upper wall of the cover main body 21 so that when the release operation is performed from directly above, the release operation portion of the lock arm 13 can be pressed with a finger.

  When assembling the connector 1 with an electric wire cover, first, as shown in FIG. 1, the terminals 30 connected to the terminals of the electric wires W are inserted into the terminal accommodating chambers of the connector housing 10 from the rear end opening 12 and set. When all of the terminals 30 are inserted and set as shown in FIG. 2 and the connector 2 is assembled, as shown by the arrow A in FIG. Pull out W while bending it in the horizontal direction. Then, as shown by an arrow B in FIG. 4, in a state where all the wires W are bundled, they are lifted upward while being hooked on the guide protrusion 15 from the lower side of the guide protrusion 15, and directly forward along the upper surface of the connector housing 10. And is passed through the wire passage groove 16 a of the wire holding portion 16.

  By doing so, the reaction force in the restoring direction of the electric wire W bent by being hooked on the guide protrusion 15 can be received by the restriction wall 16b having an L-shaped cross section of the electric wire holding portion 16, and in this state, a plurality of The electric wires W can be held in a bundle, and the electric wires W can be led forward (a predetermined direction to be guided by the electric wire cover 20).

  As shown in FIGS. 5 and 6, when the electric wire W is brazed as described above, the electric wire cover 20 is attached to the rear portion of the connector 2 from the rear when the electric wire restricting portion (the guide protrusion 15 and the electric wire holding portion 16) is held and fixed. Installing. In the mounted state, the cover main body portion 21 of the electric wire cover 20 covers the entire rear surface of the connector 2 and also covers a part of the lock arm 13 as shown in FIGS. Moreover, the electric wire holding part cover part 22 covers the bent part of the electric wire W brazed toward the front and the electric wire holding part 16. Further, the extension plate 23 extends along the upper side of the electric wire W heading forward. Therefore, the electric wire W can be taped using the extension plate 23 as a protector.

  As described above, according to the connector 1 with an electric wire cover of the present embodiment, the electric wire that regulates the connector 2 by brazing the plural electric wires W drawn from the rear portion of the connector 2 so as to face in a predetermined direction. Since the restricting portion (the guide protrusion 15 and the electric wire holding portion 16) is provided, it is possible to prevent the electric wire W from being scattered and to solve the problem of the electric wire W being caught when the electric wire cover 20 is attached. . Therefore, the assembly cycle time can be reduced.

  In particular, a plurality of electric wires W pulled out from the rear portion of the connector 2 are hooked and bent on the guide protrusions 15 as the first electric wire restricting portions, and the electric wires W are further bent into the electric wire holding portions 16 as the second electric wire restricting portions. Therefore, the electric wire W can be fixed while reliably preventing the looseness, and the electric wire cover 20 can be easily attached.

  Incidentally, when considering a connector 2B having no guide protrusion 15 or electric wire holding portion 16 as shown in FIG. 9, there is a portion for guiding the electric wire W to the position indicated by the C1 circle portion or C2 circle portion of the connector housing 10B. As a result, some of the electric wires W1 and W2 are easily separated. Therefore, as shown in FIG. 10, when the electric wire cover 20 is attached to the rear part of the connector 2B, there is a possibility that the separated electric wires W1 and W2 are caught between the electric wire cover 20 and the connector 2B.

  Accordingly, it can be said that the effect of preventing the electric wire W from being caught by providing the guide protrusion 15 and the electric wire holding portion 16 as in the connector 1 with electric wire cover of the present embodiment is significant.

  Moreover, in this connector 1 with an electric wire cover, since a part of lock arm 13 can be covered by the extension part of the upper wall of the cover main-body part 21 of the electric wire cover 20, the lock arm 13 is released carelessly. Can be prevented.

  Next, a second embodiment of the present invention will be described. In the description of the second embodiment, the same members as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  FIG. 11 is a side view showing a state in which the electric wire is fixed to the connector with the electric wire cover of the first embodiment, FIG. 12 is an exploded perspective view of the connector with the electric wire cover of the second embodiment before mounting the cover, and FIG. FIG. 14 is a perspective view of the connector of FIG. 13 with the lower extension plate closed, and FIG. 15 is a perspective view of the connector of FIG. 14 viewed from the back side. 16 is a side view of the connector of FIG.

  In the connector 1 with an electric wire cover of the first embodiment shown in FIG. 6, the electric wire W is fixed to the extension plate 23 of the electric wire holding portion cover portion 22 with an adhesive tape T as shown in FIG. 11. At this time, the upper side of the electric wire W is restricted by the extension plate 23, but the lower side is only restricted by the adhesive tape T. Therefore, when the downward force shown by arrow C acts on the electric wire W, there exists a possibility that the adhesive tape T may be damaged and the electric wire W may come off.

  Therefore, as illustrated in FIGS. 12 to 16, in the connector 1 </ b> A with the electric wire cover according to the second embodiment, the extension plate 23 includes an upper extension plate 23 a and a lower extension plate 23 b. The lower extension plate 23b is rotatably connected to the upper extension plate 23a by a hinge portion 24 as shown by an arrow D in FIG. The upper extension plate 23a and the lower extension plate 23b are formed as halved cylinders having a substantially U-shaped or C-shaped cross section, and are closed so that the concave portions thereof face each other, thereby constituting the electric wire housing portion. The closed upper extension plate 23 a and the lower extension plate 23 b are fixed in the closed state by the lock mechanism 25. The lock mechanism 25 includes two lock claws 25a formed on the upper extension plate 23a and two lock frames 25b formed on the lower extension plate 23b. The lock frame 25b is locked to the lock claws 25a. Thus, the closed state of the upper extension plate 23a and the lower extension plate 23b is fixed.

  FIG. 12 is a perspective view of a state before the electric wire cover 20 is inserted into the connector 2, and the lower extension plate 23b of the electric wire cover 20 is in an open state. As shown in FIG. 13, after the wire cover 20 is inserted into the connector 2, the lower extension plate 23 b is rotated and closed as indicated by the arrow D, and as shown in FIGS. 14 and 15, the lock mechanism 25. To fix the closed state of the lower extension plate 23b.

  Further, as shown in FIG. 16, the lower extension plate 23b is provided with a backlash preventing projection 27 that presses against the front end of the connector housing 10 in the closed state. The backlash prevention protrusion 27 is formed at the connector-side end of the lower extension plate 23 b and presses against the front end of the connector housing 10, thereby preventing rattling between the lower extension plate 23 b and the connector housing 10. Further, the backlash prevention protrusion 27 is in contact with the front end of the connector housing 10 in a vertical direction over a predetermined length, so that even when a downward force is applied to the electric wire W, sufficient resistance is applied to the lower extension plate 23b. It acts to prevent the lower extension plate 23b from being deformed.

  Thus, according to the connector 1A with an electric wire cover of the second embodiment, since the electric wire W is held and fixed by the upper extension plate 23a and the lower extension plate 23b formed on the electric wire cover 20, the electric wire W is fixed. There is no need to fix to the wire cover 20 with the adhesive tape T. Moreover, since the circumference | surroundings of the electric wire W are covered with the upper side extension board 23a and the lower side extension board 23b, the electric wire holding force by the electric wire cover 20 increases. Further, the backlash preventing projection 27 formed on the lower extension plate 23b presses against the front end of the connector housing 10, whereby the back extension plate 23b can be prevented from rattling and deformation, and the electric wire W can be disconnected. Can be prevented.

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. In addition, the material, shape, dimensions, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.

  For example, in the said embodiment, although the case where the electric wire W pulled out from the rear part of the connector 2 was guide | induced toward the front was shown, the direction which guides the electric wire W is not specifically limited, According to the direction to guide, electric wire regulation What is necessary is just to provide a part.

DESCRIPTION OF SYMBOLS 1 Connector with electric wire cover 2 Connector 10 Connector housing 11 Electric wire extraction part 15 Guide protrusion (1st electric wire control part)
16 Electric wire holding part (second electric wire regulating part)
16a Wire passage groove 16b Restriction wall 20 Wire cover 26 Notch 30 Terminal W Wire

Claims (5)

In the connector with the electric wire cover attached to the rear portion of the connector, the electric wire cover mounted to guide and lead in a predetermined direction while protecting a plurality of electric wires drawn from the rear portion of the connector,
A connector with an electric wire cover, wherein the connector is provided with an electric wire restricting portion that brazes and restricts a plurality of electric wires drawn from the rear portion of the connector so as to face in the predetermined direction. On the rear surface of the connector, there is provided a wire lead-out portion that pulls out the plurality of wires toward the rear,
A first wire is bent in the direction along the outer surface of the connector in a bundled state by hooking a plurality of wires drawn backward from the wire drawing portion in the vicinity of the wire drawing portion. The wire restriction part is provided,
The reaction force in the restoring direction of the electric wire bent by being hooked on the first electric wire restricting portion is received by the restricting wall at a position away from the first electric wire restricting portion, and the plurality of electric wires are in that state. The connector with an electric wire cover according to claim 1, wherein the second electric wire regulating portion that guides the electric wire in the predetermined direction by holding the bundle in a bundle is provided.   A lock arm that engages with a lock portion of the mating connector when the mating connector is fitted is provided at the top of the connector, and the wire cover is extended to cover a part of the lock arm. The connector with an electric wire cover according to claim 1 or 2.   The second electric wire restricting portion is composed of two halved cylinders having a wire holding concave portion, and one of the halved cylinders is coupled to the other half halved cylinder so as to be rotatable by a hinge portion, The connector with an electric wire cover according to any one of claims 1 to 3, wherein the electric wire is regulated by fixing the two half cylinders in a closed state.   5. The connector with an electric wire cover according to claim 4, wherein one of the rotatable half cylinders is provided with a backlash preventing protrusion that presses against the connector end in the closed state.

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