An electronic control input connector for new energy vehicles

Abstract

The present invention relates to the technical field of connectors, and particularly relates to an electronic control input connector for a new energy vehicle, which includes a male seat and a female seat; the female seat is provided with a receiving cavity; a female terminal is arranged in the receiving cavity; a connecting plate is arranged at the bottom of the female seat; a lifting seat is arranged on the connecting plate in a lifting and moving manner; a clamping hole is arranged at one end of the lifting seat; a blocking inclined plate extends upward from the connecting plate; the blocking inclined plate is movably arranged through the clamping hole; an inclined surface is arranged at the bottom of the lifting seat; the inclination angle of the inclined surface is greater than the inclination angle of the blocking inclined plate; a thermal drive assembly for driving the lifting seat to lift is arranged in the receiving cavity; the male seat is provided with a boss; a male terminal is arranged on the boss; a clamping rod that cooperates with the clamping hole is arranged on the boss in a telescopic and movable manner. By setting the thermal drive assembly, when the load carried by the vehicle is too large or the working temperature increases, the female seat and the male seat can be automatically cut off and separated, so as to effectively protect the connector and effectively improve the safety performance.

Description

Technical Field

[0001] The present invention relates to the technical field of connectors, and particularly to an electric control input connector for new energy vehicles. Background Art

[0002] With the rapid development of new energy vehicles, electric vehicles have shown significant advantages in environmental protection, energy conservation, and carbon emission reduction. However, in the electrical system of new energy vehicles, electric control connectors play a crucial role. Electric control connectors are not only used to transmit kinetic energy but also to transfer control signals to ensure the normal operation of the vehicle and the realization of various functions.

[0003] Electric control connectors in the prior art usually need to handle relatively high currents and transmission powers, which pose higher requirements for their working stability and safety. Under the conditions of high-current and high-power transmission, electric control connectors are prone to generating heat, especially during long-term operation, and the temperature accumulation becomes significant.

[0004] However, there are significant potential safety hazards in the current electric control connectors under high-temperature environments. Long-term high-temperature operation will cause the materials inside the connectors to age and the contact resistance to increase, thereby further increasing the temperature. If the current cannot be cut off in time or effective heat dissipation measures are not taken, the connectors may catch fire or the parts may burn out, and even cause a fire, posing a great risk to the safe operation of new energy vehicles. Summary of the Invention

[0005] The object of the present invention is to provide an electric control input connector for new energy vehicles in view of the above deficiencies in the prior art.

[0006] The object of the present invention is achieved through the following technical solutions: an electric control input connector for new energy vehicles, including a male seat and a female seat;

[0007] The female seat is provided with a receiving cavity; a female terminal is arranged in the receiving cavity; a connecting plate is provided at the bottom of the female seat; a lifting seat is arranged on the connecting plate in a lifting and movable manner; a clamping hole is provided at one end of the lifting seat; an upper through groove communicating with the clamping hole is provided through the top of the lifting seat; a lower through groove communicating with the clamping hole is provided through the lifting seat; a blocking inclined plate is provided extending upward from the connecting plate; the blocking inclined plate is arranged movably through the upper through groove, the clamping hole, and the lower through groove; an inclined surface is provided at the bottom of the lifting seat; the inclination angle of the inclined surface is greater than the inclination angle of the blocking inclined plate; a thermal driving component for driving the lifting seat to lift is arranged in the receiving cavity;

[0008] The male seat is provided with a boss; a male terminal is arranged on the boss; a clamping rod cooperating with the clamping hole is arranged on the boss in a telescopic and movable manner.

[0009] The present invention is further configured such that a sliding rod is provided at the bottom of the lifting seat; the sliding rod is vertically slidably disposed on the connecting plate; a limiting head is provided after the sliding rod passes through the connecting plate; and a limiting spring is provided between the limiting head and the bottom of the connecting plate.

[0010] The present invention is further configured such that the lower through groove is provided in the middle of the inclined surface; the upper through groove and the clamping holes are respectively provided in the middle of the lifting seat.

[0011] The present invention is further configured such that a pop-up spring for abutting against the top of the boss is provided at the top of the accommodating cavity.

[0012] The present invention is further configured such that the thermal driving assembly includes a bracket provided in the accommodating cavity, a roller rotatably provided on the bracket, and a thermal spring provided between the roller and the bracket;

[0013] The thermal driving assembly further includes a clamping seat that is vertically movably provided on the top of the lifting seat; elastic pieces for clamping the lifting seat are provided on both the left and right sides of the clamping seat; and a linkage assembly is provided between the roller and the clamping seat.

[0014] The present invention is further configured such that clamping blocks are provided on both sides of the lifting seat; the clamping blocks are provided with clamping grooves; and the elastic pieces are provided with protrusions that cooperate with the clamping grooves.

[0015] The present invention is further configured such that a guide plate is provided on the top of the connecting plate; the guide plate is provided with a guide groove; the clamping blocks are vertically movably provided in the guide groove and protrude out of the guide groove;

[0016] An upper inclined surface is provided at the top of the clamping groove; a lower inclined surface is provided at the bottom of the clamping groove.

[0017] The present invention is further configured such that the linkage assembly includes a driving groove provided on the outer surface of the roller, a connecting rod provided on the clamping seat, a driving pin that is movably telescopic in the connecting rod, and a tension spring provided between the top of the connecting rod and the bracket.

[0018] The present invention is further configured such that the driving groove includes a horizontal groove, a vertical groove, and a spiral groove; the horizontal groove and the vertical groove are perpendicularly arranged; one end of the horizontal groove is connected to one end of the spiral groove; the other end of the spiral groove is connected to one end of the vertical groove; the other end of the vertical groove is connected to the other end of the horizontal groove;

[0019] The depth of the spiral groove is the same as the depth of the vertical groove; the depth of the horizontal groove is greater than the depth of the vertical groove.

[0020] The present invention is further configured such that a guide inclined surface is provided between the other end of the vertical groove and the other end of the horizontal groove; a blocking step is formed between one end of the horizontal groove and one end of the spiral groove;

[0021] The rising stroke of the lifting seat is less than the length of the vertical groove.

[0022] The present invention is further configured such that the convex platform is provided with a telescopic groove; the clamping rod is telescopically and movably disposed in the telescopic groove; the clamping rod is provided with a frustum-shaped portion; and a return spring is provided between the frustum-shaped portion and the bottom wall of the telescopic groove.

[0023] Advantages of the present invention: By providing a thermosensitive driving assembly, when the load carried by the vehicle is too large or the working temperature increases, the female seat and the male seat can be automatically cut off and separated, thereby effectively protecting the connector and effectively improving the safety performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The invention will be further described with reference to the accompanying drawings, but the embodiments in the drawings do not constitute any limitation to the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to the following drawings without creative efforts.

[0025] Figure 1 is a schematic structural diagram of the present invention;

[0026] Figure 2 is a schematic structural diagram of the female seat of the present invention;

[0027] Figure 3 is a schematic structural diagram of the male seat of the present invention;

[0028] Figure 4 is an internal structural diagram of the female seat of the present invention;

[0029] Figure 5 is an internal structural diagram of the female seat from another perspective of the present invention;

[0030] Figure 6 is a cross-sectional view after the convex block and the lifting seat are clamped of the present invention;

[0031] Figure 7 is a cross-sectional view after the male seat and the female seat of the present invention are inserted;

[0032] Figure 8 is Figure 7 a partial enlarged view of part A in

[0033] Figure 9 is a schematic structural diagram of the thermosensitive driving assembly of the present invention;

[0034] Figure 10 is a schematic structural diagram of the roller of the present invention;

[0035] Wherein: 1. Male seat; 11. Boss; 12. Male terminal; 13. Clamping rod; 2. Female seat; 21. Accommodating cavity; 22. Female terminal; 23. Connecting plate; 24. Blocking inclined plate; 25. Ejecting spring; 26. Telescopic groove; 27. Frustum portion; 28. Reset spring; 3. Lifting seat; 31. Clamping hole; 32. Upper through groove; 33. Lower through groove; 34. Inclined surface; 41. Sliding rod; 42. Limiting head; 43. Limiting spring; 5. Bracket; 51. Thermosensitive coil spring; 52. Pulling spring; 6. Roller; 61. Horizontal groove; 62. Vertical groove; 63. Spiral groove; 64. Guiding inclined surface; 65. Blocking step; 7. Clamping seat; 71. Elastic piece; 72. Protrusion; 73. Connecting rod; 74. Driving pin; 8. Clamping block; 81. Clamping groove; 91. Guiding plate; 92. Guiding groove. Specific embodiments

[0036] The present invention will be further described in conjunction with the following embodiments.

[0037] As Figures 1 to 10 can be seen, a power control input connector for a new energy vehicle in this embodiment includes a male seat 1 and a female seat 2;

[0038] The female seat 2 is provided with an accommodating cavity 21; a female terminal 22 is arranged in the accommodating cavity 21; a connecting plate 23 is arranged at the bottom of the female seat 2; a lifting seat 3 is arranged on the connecting plate 23 in a lifting and movable manner; a clamping hole 31 is arranged at one end of the lifting seat 3; an upper through groove 32 communicating with the clamping hole 31 is arranged through the top of the lifting seat 3; a lower through groove 33 communicating with the clamping hole 31 is arranged through the lifting seat 3; a blocking inclined plate 24 is arranged by the connecting plate 23 extending upward; the blocking inclined plate 24 is arranged through and movably between the upper through groove 32, the clamping hole 31 and the lower through groove 33; an inclined surface 34 is arranged at the bottom of the lifting seat 3; the inclination angle of the inclined surface 34 is greater than the inclination angle of the blocking inclined plate 24, that is, the included angle between the inclined surface 34 and the connecting plate 23 is smaller than the included angle between the blocking inclined plate 24 and the connecting plate 23; a thermosensitive driving assembly for driving the lifting of the lifting seat 3 is arranged in the accommodating cavity 21;

[0039] The male seat 1 is provided with a boss 11; a male terminal 12 is arranged on the boss 11; a clamping rod 13 cooperating with the clamping hole 31 is arranged on the boss 11 in a telescopic and movable manner.

[0040] Specifically, when installing the female seat 2 and the male seat 1 of the new energy vehicle electric control input connector in this embodiment, the boss 11 of the male seat 1 is inserted into the accommodating cavity 21 from the bottom of the female seat 2; before installing the female seat 2 and the male seat 1, the lifting seat 3 is located at the bottom of the accommodating cavity 21 and abuts against the connecting plate 23. When installing the female seat 2 and the male seat 1, after the clamping rod 13 contacts the lifting seat 3, it first moves upward along the inclined surface 34. During the upward movement of the clamping rod 13, the clamping rod 13 contracts towards the inside of the boss 11. Until the clamping rod 13 completely passes through the inclined surface 34, the clamping rod 13 resets and enters the clamping hole 31 from the opening of the clamping hole 31, and abuts against the blocking inclined plate 24 in the clamping hole 31;

[0041] When the vehicle load is too large or the working temperature increases, the thermal drive assembly drives the lifting seat 3 to move upward. During the upward movement of the lifting seat 3, since the clamping rod 13 always abuts against the blocking inclined plate 24, when the lifting seat 3 moves upward, it drives the boss 11 and the clamping rod 13 to move upward. At the same time, the blocking inclined plate 24 drives the clamping rod 13 to contract towards the inside of the boss 11. Until the clamping rod 13 completely exits the clamping hole 31, the female seat 2 and the male seat 1 can be separated.

[0042] In this embodiment, by setting the thermal drive assembly, when the vehicle load is too large or the working temperature increases, the female seat 2 and the male seat 1 can be automatically cut off and separated, thereby effectively protecting the connector and effectively improving the safety performance.

[0043] For a new energy vehicle electric control input connector in this embodiment, a sliding rod 41 is provided at the bottom of the lifting seat 3; the sliding rod 41 is slidably arranged on the connecting plate 23 in a lifting manner; a limit head 42 is provided after the sliding rod 41 passes through the connecting plate 23; a limit spring 43 is provided between the limit head 42 and the bottom of the connecting plate 23.

[0044] Specifically, through the above settings, before installing the female seat 2 and the male seat 1, due to the action of the limit spring 43, the lifting seat 3 is located at the bottom of the accommodating cavity 21 and abuts against the connecting plate 23. When installing the female seat 2 and the male seat 1, after the clamping rod 13 contacts the lifting seat 3, it first moves upward along the inclined surface 34. During the upward movement of the clamping rod 13, the clamping rod 13 contracts towards the inside of the boss 11. Until the clamping rod 13 completely passes through the inclined surface 34, the clamping rod 13 resets and enters the clamping hole 31 from the opening of the clamping hole 31, and abuts against the blocking inclined plate 24 in the clamping hole 31; and due to the action of the limit spring 43, when the clamping rod 13 moves upward, it will not drive the lifting seat 3 to rise, thereby ensuring the stable connection between the clamping hole 31 and the clamping rod 13.

[0045] A new energy vehicle electronic control input end connector according to this embodiment, the lower through groove 33 is arranged in the middle of the inclined surface 34; the upper through groove 32 and the clamping hole 31 are respectively arranged in the middle of the lifting seat 3. Through the above settings, the overall structure is stable and reliable.

[0046] A new energy vehicle electronic control input end connector according to this embodiment, a pop-up spring 25 for abutting against the top of the boss 11 is arranged at the top of the accommodation cavity 21.

[0047] Specifically, through the above settings, when the vehicle load is too large or the working temperature increases, the thermosensitive drive assembly drives the lifting seat 3 to move upward. During the upward movement of the lifting seat 3, since the clamping rod 13 always abuts against the blocking inclined plate 24, during the upward movement of the lifting seat 3, the boss 11 and the clamping rod 13 are driven to move upward. At this time, the boss 11 compresses the pop-up spring 25, and at the same time, the blocking inclined plate 24 drives the clamping rod 13 to contract into the boss 11 until the clamping rod 13 completely exits the clamping hole 31, and then the pop-up spring 25 resets, that is, the female seat 2 and the male seat 1 can be automatically separated.

[0048] A new energy vehicle electronic control input end connector according to this embodiment, the thermal drive assembly includes a bracket 5 disposed in the accommodation cavity 21, a roller 6 rotatably disposed on the bracket 5, and a thermal spring 51 disposed between the roller 6 and the bracket 5; wherein the thermal spring 51 is made of a shape memory alloy. When the temperature of the thermal spring 51 is below its shape memory temperature, the thermal spring 51 is in an extended state. When the temperature of the thermal spring 51 is above its shape memory temperature, the thermal spring 51 deforms and winds up; the thermal drive assembly further includes a clamping seat 7 that is vertically movably disposed on the top of the lifting seat 3; elastic pieces 71 for clamping the lifting seat 3 are disposed on both the left and right sides of the clamping seat 7; a linkage assembly is disposed between the roller 6 and the clamping seat 7. A new energy vehicle electronic control input end connector according to this embodiment, clamping blocks 8 are disposed on both sides of the lifting seat 3; the clamping blocks 8 are provided with clamping grooves 81; the elastic pieces 71 are provided with protrusions 72 that cooperate with the clamping grooves 81. A new energy vehicle electronic control input end connector according to this embodiment, a guide plate 91 is disposed on the top of the connecting plate 23; the guide plate 91 is provided with a guide groove 92; the clamping blocks 8 are vertically movably disposed in the guide groove 92 and protrude out of the guide groove 92; by providing the guide groove 92, the lifting seat 3 can perform stable vertical movement; an upper inclined surface is disposed at the top of the clamping groove 81; a lower inclined surface is disposed at the bottom of the clamping groove 81. A new energy vehicle electronic control input end connector according to this embodiment, the linkage assembly includes a drive groove disposed on the outer surface of the roller 6, a connecting rod 73 disposed on the clamping seat 7, a drive pin 74 that is movably telescopic in the connecting rod 73, and a tension spring 52 disposed between the top of the connecting rod 73 and the bracket 5. A new energy vehicle electronic control input end connector according to this embodiment, the drive groove includes a horizontal groove 61, a vertical groove 62, and a spiral groove 63; the horizontal groove 61 is perpendicular to the vertical groove 62; one end of the horizontal groove 61 is connected to one end of the spiral groove 63; the other end of the spiral groove 63 is connected to one end of the vertical groove 62; the other end of the vertical groove 62 is connected to the other end of the horizontal groove 61; the depth of the spiral groove 63 is the same as the depth of the vertical groove 62; the depth of the horizontal groove 61 is greater than the depth of the vertical groove 62. A new energy vehicle electronic control input end connector according to this embodiment, a guide inclined surface 64 is disposed between the other end of the vertical groove 62 and the other end of the horizontal groove 61; a blocking step 65 is formed between one end of the horizontal groove 61 and one end of the spiral groove 63; the ascending stroke of the lifting seat 3 is less than the length of the vertical groove 62.

[0049] Specifically, for the new energy vehicle electronic control input end connector described in this embodiment, before the female seat 2 and the male seat 1 are installed, due to the action of the limit spring 43, the lifting seat 3 is located at the bottom of the accommodation cavity 21 and the bottom of the lifting seat 3 abuts against the connecting plate 23;

[0050] When installing the female socket 2 and the male socket 1, insert the boss 11 of the male socket 1 into the accommodating cavity 21 from the bottom of the female socket 2; after the clamping rod 13 contacts the lifting seat 3, it first moves upward along the inclined surface 34. During the upward movement of the clamping rod 13, the reset spring 28 of the clamping rod 13 contracts into the telescopic groove 26 of the boss 11; since the stiffness of the limit spring 43 is greater than that of the reset spring 28, the clamping rod 13 cannot drive the lifting seat 3 to rise at this time; until the clamping rod 13 completely passes through the inclined surface 34, the clamping rod 13 enters the clamping hole 31 from the opening of the clamping hole 31 under the reset action of the reset spring 28 and abuts against the blocking inclined plate 24 in the clamping hole 31; making the connection between the clamping hole 31 and the clamping rod 13 firm;

[0051] When it is necessary to separate the male socket 1 and the female socket 2 by oneself, continue to push the boss 11 upward. The boss 11 drives the lifting seat 3 to rise through the locking of the clamping hole 31 and the clamping rod 13. During the upward movement of the lifting seat 3, since the clamping rod 13 always abuts against the blocking inclined plate 24, when the lifting seat 3 moves upward, the boss 11 compresses the pop-up spring 25, and at the same time the blocking inclined plate 24 drives the clamping rod 13 to contract into the boss 11. Until the clamping rod 13 completely exits the clamping hole 31, the pop-up spring 25 resets, and the female socket 2 and the male socket 1 can be automatically separated;

[0052] In addition, when the temperature is normal, the driving pin 74 is located at one end of the horizontal groove 61, and under the action of the tension spring 52, the clamping seat 7 is located above the lifting seat 3; when the load carried by the vehicle is too large or the working temperature increases, the thermosensitive coil spring 51 deforms and winds up, thereby driving the roller 6 to rotate clockwise. During the clockwise rotation of the roller 6, the driving pin 74 descends along the spiral groove 63 until it moves to the bottom of the vertical groove 62. The convex block 72 of the elastic piece 71 is clamped with the clamping groove 81 of the clamping block 8, and under the action of the tension spring 52, the driving pin 74 moves upward along the vertical groove 62, thereby driving the lifting seat 3 to rise until the lifting seat 3 rises to the end of the rising stroke, that is, the top of the guide groove 92. When the clamping rod 13 completely exits the clamping hole 31, the pop-up spring 25 resets, and the female socket 2 and the male socket 1 can be automatically separated; and since the rising stroke of the lifting seat 3 is less than the length of the vertical groove 62, when the lifting seat 3 rises to the top of the guide groove 92, the driving pin 74 still needs to move upward along the vertical groove 62 under the action of the tension spring 52. Under the action of the upper inclined surface, the elastic piece 71 deforms, so that the convex block 72 exits from the clamping groove 81 of the clamping block 8, and the lifting seat 3 resets under the action of the limit spring 43 until the driving pin 74 moves to the top of the vertical groove 62;

[0053] When the temperature returns to normal, the thermosensitive coil spring 51 re-stretches, thereby driving the roller 6 to rotate reversely, so that the driving pin 74 moves along the horizontal groove 61 until it moves to one end of the horizontal groove 61 to complete the reset.

[0054] A connector for the electronic control input end of a new energy vehicle according to this embodiment, wherein the boss 11 is provided with a telescopic groove 26; the clamping rod 13 is telescopically arranged in the telescopic groove 26; the clamping rod 13 is provided with a frustum portion 27; a return spring 28 is arranged between the frustum portion 27 and the bottom wall of the telescopic groove 26. Specifically, through the above arrangement, it is convenient to disassemble and assemble the male seat 1 and the female seat 2 through the cooperation of the clamping rod 13 and the clamping hole 31.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A new energy vehicle electronic control input connector, characterized in that: Includes male and female seats; The female seat is provided with a containing cavity; a female terminal is provided in the containing cavity; a connecting plate is provided at the bottom of the female seat; a lifting seat is provided with a lifting and lowering seat for lifting and lowering movement of the connecting plate; a clamping hole is provided at one end of the lifting and lowering seat; an upper through groove connected to the clamping hole is provided through the top of the lifting and lowering seat; a lower through groove connected to the clamping hole is provided through the lifting and lowering seat; a blocking inclined plate is provided on the connecting plate extending upward; the blocking inclined plate is movably provided between the upper through groove, the clamping hole and the lower through groove; an inclined surface is provided at the bottom of the lifting and lowering seat; the inclination angle of the inclined surface is greater than the inclination angle of the blocking inclined plate; a thermal driving component for driving the lifting and lowering seat to lift and lower is provided in the containing cavity; The male seat is provided with a boss; the boss is provided with a male terminal; the boss is telescopically provided with a clamping rod that cooperates with the clamping hole; The thermal drive assembly includes a bracket arranged in the accommodating cavity, a roller rotatably arranged on the bracket, and a thermal coil spring arranged between the roller and the bracket; The thermal drive assembly also includes a clamping seat that is movable and arranged on the top of the lifting seat; both left and right sides of the clamping seat are provided with spring plates for clamping the lifting seat; a linkage assembly is provided between the roller and the clamping seat; The linkage assembly includes a driving groove arranged on the outer surface of the roller, a connecting rod arranged on the clamping seat, a driving pin movably and telescopically arranged on the connecting rod, and a tension spring arranged between the top of the connecting rod and the bracket; The driving groove comprises a horizontal groove, a vertical groove and a spiral groove; the horizontal groove is arranged perpendicularly to the vertical groove; one end of the horizontal groove is connected to one end of the spiral groove; the other end of the spiral groove is connected to one end of the vertical groove; the other end of the vertical groove is connected to the other end of the horizontal groove; The depth of the spiral groove is the same as the depth of the vertical groove; the depth of the horizontal groove is greater than the depth of the vertical groove; A guiding slope is provided between the other end of the vertical groove and the other end of the horizontal groove; a blocking step is formed between one end of the horizontal groove and one end of the spiral groove; The rising stroke of the lifting seat is smaller than the length of the vertical slot.

2. The new energy vehicle electric control input connector according to claim 1, characterized in that: A sliding rod is provided at the bottom of the lifting seat; the sliding rod is lifted and slidably arranged on the connecting plate; a limiting head is provided after the sliding rod passes through the connecting plate; a limiting spring is provided between the limiting head and the bottom of the connecting plate.

3. The new energy vehicle electric control input connector according to claim 1, characterized in that: The lower through slot is arranged at the middle of the inclined surface; the upper through slot and the clamping hole are respectively arranged at the middle of the lifting seat.

4. The new energy vehicle electric control input connector according to claim 1, characterized in that: A pop-up spring for abutting against the top of the boss is arranged on the top of the accommodating cavity.

5. The new energy vehicle electric control input connector according to claim 1, characterized in that: Both sides of the lifting seat are provided with clamping blocks; the clamping blocks are provided with clamping grooves; and the spring pieces are provided with protrusions matched with the clamping grooves.

6. The new energy vehicle electric control input connector according to claim 5, characterized in that: A guide plate is provided on the top of the connecting plate; a guide groove is provided on the guide plate; the clamping block is movable in the guide groove and protrudes out of the guide groove; The top of the clamping groove is provided with an upper inclined surface; the bottom of the clamping groove is provided with a lower inclined surface.

7. The new energy vehicle electric control input connector according to claim 1, characterized in that: The boss is provided with a telescopic slot; the clamping rod is telescopically arranged in the telescopic slot; the clamping rod is provided with a truncated cone portion; a reset spring is provided between the truncated cone portion and the bottom wall of the telescopic slot.

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