CN213003711U - Flat mouthful ware - Google Patents

Abstract

The utility model provides a flat mouthful ware, including base, splint, injecing subassembly, push rod and knife rest, be equipped with the through-hole that a plurality of sizes are different on the splint, be equipped with the splint of being convenient for and insert and horizontal gliding cell body on the base, insert in the cell body when splint, inject the through-hole that corresponds with this location pipe fitting through injecing the position of subassembly to splint, be equipped with the cavity in the base, the push rod inserts in the cavity along cavity one end, be equipped with the insertion groove on the base, the knife rest is arranged in the cavity along the insertion groove, push rod one end is axial motion and rotary motion with knife rest fixed connection and drive knife rest in the cavity, the push rod other end inwards caves in.

Description

Flat mouthful ware

Technical Field

The utility model relates to a flat mouthful ware.

Background

At present, for copper tubes, aluminum tubes and stainless steel tube products of various specifications required in products such as air conditioners, refrigerators, television antennas and the like, burrs are formed on cut surfaces of the tubes after the tubes are cut off in site construction, and the products can be used only by removing the burrs and expanding the holes.

The prior deburring technology usually adopts a scraper, and the scraper is light, but drives in the armrest, wastes time and energy, and the pipe wall unevenness behind the deburring adopts an eccentric flaring ware during flaring in addition, also relies on hand power operation, and is more arduous, operates inconveniently, need prepare multiple instrument to the pipe fitting user of different models in addition, carries very inconveniently.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a simple structure, convenient operation, can be effectual carry out the flat mouthpart of deburring to the pipe fitting of different models.

In order to achieve the above purpose, the technical scheme of the utility model is realized like this:

the utility model provides a flat mouthful ware, its characterized in that includes base, splint, inject subassembly, push rod and knife rest, be equipped with the through-hole that a plurality of sizes are different on the splint, be equipped with the splint of being convenient for and insert and horizontal gliding cell body on the base, insert in the cell body after splint, inject the through-hole that corresponds with this location pipe fitting through the position of injecing the subassembly to splint, a serial communication port, be equipped with the cavity in the base, the push rod inserts in the cavity along cavity one end, be equipped with the insertion groove on the base, the knife rest is arranged in the cavity along the insertion groove, push rod one end with knife rest fixed connection drives the knife rest and is in axial motion and rotary motion are in the cavity, the push rod other end inwards caves in.

The end face of the limiting block and the end face of the third push rod are respectively abutted against the two ends of the first spring, and the end part of the fourth push rod is fixedly connected with the tool rest.

The inner side wall of the base protrudes inwards to form a limiting ring, two ends of the limiting ring are respectively provided with a first rolling bearing and a second rolling bearing, the first rolling bearing is sleeved on the third push rod portion, and the second rolling bearing is sleeved on the tool rest.

The inner side wall of the base is provided with a limiting groove matched with the first retaining ring and the second retaining ring.

And the base is provided with a process through hole at a position vertical to the limiting groove.

The blade mounting device comprises a blade frame, a blade, a first push rod part, a second push rod part, a connecting groove, a second rolling bearing, a second retaining ring and a blade disc, wherein the blade disc used for mounting the blade is arranged on one side of the blade frame, the connecting groove is formed in the other side of the blade frame and is convenient for the fourth push rod part to insert, the second rolling bearing is sleeved on the outer side of.

And a blade mounting screw hole convenient for mounting the blade is formed in the cutter head.

The tool rest is provided with a threaded through hole, and the fourth push rod part is provided with a threaded hole corresponding to the threaded through hole.

And the outer side of the fourth push rod part is provided with threads matched with the threads of the groove wall of the connecting groove.

The limiting assembly comprises a locking screw and a wave screw, first thread through holes matched with the locking screw and the wave screw are respectively formed in the positions, located on the upper side and the lower side of the groove body, of the limiting assembly, and grooves corresponding to the end portions of the locking screw and the wave screw are formed in the upper side and the lower side of the clamping plate.

Wherein, the locking screw upper end is equipped with the rotation handle.

Wherein, still include flaring ware and flaring push rod, flaring ware and knife rest fixed connection to with knife rest synchronous motion, the flaring ware includes toper pressure head and flaring ware body, and the vertex of a cone of toper pressure head is coaxial with the axle center of flaring ware body, flaring push rod and push rod fixed connection to with push rod synchronous motion, the flaring push rod has an annular cavity, be equipped with the screw thread on the annular cavity lateral wall, the base be close to push rod one side be equipped with the screw thread that matches on the annular cavity lateral wall.

One side of the flaring device body is inwards sunken to form an accommodating cavity, threads are arranged on the side wall of the accommodating cavity, and threads matched with the side wall of the accommodating cavity are arranged at the joint of the tool rest and the flaring device.

The flaring push rod is connected with the push rod sleeve through an inserting pipe arranged at the central position, a clamping block is arranged on the outer side wall of the inserting pipe, a clamping part corresponding to the clamping block is arranged on the push rod, the clamping part comprises a guide groove, a clamping part and a guide part, the clamping block enters from the guide groove and slides to the clamping part along the guide part, a second spring is further arranged between the flaring push rod and the push rod, and the push rod and the flaring push rod are circumferentially fixed through spring force.

The second spring is sleeved outside the inserting pipe, an annular groove is formed in the end face of the first push rod part on the push rod, and the second spring abuts against the bottom of the annular cavity and the annular groove respectively.

And a threaded hole is further formed in the flaring push rod, a screw is inserted along the threaded hole, and the end part of the screw penetrates through the second spring.

The protective cover is matched with the insertion groove.

Wherein, the safety cover includes two protectors, the protector includes insert portion and guard portion, guard portion be with base external diameter assorted arc structure, be equipped with bellied connecting block in the insert portion, be equipped with in the guard portion with connecting block assorted draw-in groove, it is single insert portion on the protector is equipped with protruding muscle with guard portion junction, protruding muscle with the base is inconsistent.

Compared with the prior art, the flat mouth device of the utility model has the following advantages:

the utility model adds the flaring push rod and the flaring device on the basis of the mouth flattening device, so that the device not only can effectively remove burrs from the pipe fitting, but also can flare the pipe fitting, thereby realizing the diversification of functions; the electric hand drill can be matched with an existing electric hand drill in the market for use, is driven by external force, is labor-saving in operation, and can save the electric part and greatly reduce the tool cost.

Drawings

The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:

fig. 1 is a schematic structural view of the present invention;

FIG. 2 is the schematic view of the exploded structure of the present invention

FIG. 3 is a schematic sectional view of the present invention;

fig. 4 is a schematic view of the structure of the push rod of the present invention;

FIG. 5 is a schematic cross-sectional view of the tool holder of the present invention;

FIG. 6 is a schematic top view of the through-hole structure of the present invention;

FIG. 7 is a schematic view of the present invention with a protective cover;

fig. 8 is an exploded view of the protective cover of the present invention;

FIG. 9 is a schematic perspective view of the second embodiment;

FIG. 10 is an exploded view of the second embodiment;

FIG. 11 is a schematic sectional view showing the second embodiment;

FIG. 12 is an enlarged view of part A of the second embodiment;

FIG. 13 is a schematic side view of the push rod according to the second embodiment;

FIG. 14 is a sectional view of a push rod of the second embodiment taken along the line A-A.

Detailed Description

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

In addition, in the embodiments of the present invention, the directional indications (such as upper, lower, left, right, front and rear … …) are mentioned, and the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.

All directions or positional relationships mentioned in the embodiments of the present invention are positional relationships based on the drawings, and are only for convenience of description and simplified description, and do not imply or imply that the device or element referred to must have a specific orientation, and should not be construed as limiting the present invention. If there is a description in an embodiment of the present invention referring to "first", "second", etc., the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Example one

The utility model provides a flat mouthful of ware combines fig. 1-8 to show, including base 4, splint 2, inject subassembly 3, push rod 5 and knife rest 6, be equipped with the through-hole 21 of a plurality of variation in size on the splint 2, be equipped with the cell body 1 that is convenient for splint 2 to insert and horizontal slip on the base 4, insert in cell body 1 back when splint 2, inject the through-hole 21 that corresponds with this location pipe fitting through inject subassembly 3 to the position of splint 2, a serial communication port, be equipped with cavity 41 in the base 4, in cavity 41 was inserted along cavity 41 one end to push rod 5, 5 one end of push rod with knife rest 6 fixed connection and drive knife rest 6 are in axial motion and rotary motion are done in the cavity 41, the 5 other ends of push rod inwards caves in and form notch 511.

In this embodiment, the push rod 5 includes a first push rod portion 51, a second push rod portion 52, a third push rod portion 53, and a fourth push rod portion 54, the end of the first push rod portion 51 is recessed inwards to form a notch 511 matched with a screwdriver bit, the second push rod portion 52 is attached to the wall surface of the cavity 41 of the base 4, a first spring 56 is sleeved outside the fourth push rod portion 54, a limiting block 42 is arranged in the cavity 41, the end surfaces of the limiting block 42 and the third push rod portion 53 are respectively abutted to the two ends of the first spring 56, and the end of the fourth push rod portion 54 is fixedly connected to the tool rest 6.

In this embodiment, the inner side wall of the base 4 protrudes inward to form a limiting ring 42, two ends of the limiting ring 42 are respectively provided with a first rolling bearing 531 and a second rolling bearing 541, the first rolling bearing 531 is sleeved on the third push rod portion 52, and the second rolling bearing 541 is sleeved on the tool rest 6.

In this embodiment, a first retaining ring 532 and a second retaining ring 542 are further disposed in the cavity 41, the first retainer ring 532 abuts against the first rolling bearing 531, the second retainer ring 542 abuts against the second rolling bearing 541, a limiting groove 43 matched with the first retaining ring 532 and the second retaining ring 542 is arranged on the inner side wall of the base 4, the first retaining ring 532 and the second retaining ring 542 are clamped in the limiting groove 43 to limit the positions of the first rolling bearing 531 and the second rolling bearing 541, so as to avoid the bearing from loosening after long-time use, preferably, the base 4 is provided with a technical through hole 44 at a position vertical to the limiting groove 43, when the first retainer ring 532 and the second retainer ring 542 need to be disassembled, a tool is used to pass through the through-hole 44, apply pressure and make it deviate from spacing groove 43 to the retaining ring through the instrument, demolish the retaining ring, the simple operation improves and dismantles efficiency.

In this embodiment, a cutter disc 61 for installing the blade is arranged on one side of the cutter frame 6, a connecting groove 62 for facilitating insertion of the fourth push rod part 54 is arranged on the other side of the cutter frame 6, a second rolling bearing 541 is sleeved on the outer side of the connecting groove 62, a second retaining ring 542 is arranged between the second rolling bearing 541 and the cutter disc 61, and specifically, a blade installation screw hole 64 for facilitating installation of the blade 65 is formed in the cutter disc 61.

In this embodiment, the tool rest 6 is provided with a threaded through hole 63, the fourth push rod part 54 is provided with a threaded hole 543 corresponding to the threaded through hole 63, and a screw is inserted into the threaded hole 543 along the threaded through hole 63, so that the tool rest 6 and the fourth push rod part 54 are fixedly connected, and the tool rest is convenient to operate and high in installation efficiency.

In other embodiments, the groove wall of the connecting groove 62 is provided with threads, the outer side of the fourth push rod part 54 is provided with threads matched with the threads of the groove wall of the connecting groove 62, the threaded end at the end of the fourth push rod part 54 is connected with the connecting groove 62 in a threaded manner, the fixed connection between the tool rest 6 and the fourth push rod part 54 is realized, the operation is convenient, the installation efficiency is high, the fixing of the tool rest and the fourth push rod part 54 is not required to be carried out through screws, and the production cost is reduced.

In this embodiment, the limiting component 3 includes a locking screw 31 and a wave screw 32, the main body is provided with first threaded through holes 12 at the upper and lower sides of the tank 1 respectively, the first threaded through holes 12 are matched with the locking screw 31 and the wave screw 32, the upper and lower sides of the clamping plate 2 are provided with grooves 22 corresponding to the ends of the locking screw 31 and the wave screw 32, after the clamping plate 2 is inserted into the tank 1, the clamping plate 2 is horizontally displaced to select a through hole 21 corresponding to a pipe to be processed, after the through hole 21 is determined, the corresponding groove 22 below the through hole 21 is engaged with the wave screw 32, at this time, the locking screw 31 is rotated to move the upper clamping plate downwards, when the upper and lower clamping plates are engaged, the position of the clamping plate is limited by the locking screw 31 and the wave screw 32, so as to improve the efficiency of selecting the through hole 21, and effectively ensure the processing precision, preferably, the upper end of the locking screw 31, therefore, the locking screw 31 can be conveniently rotated by an operator, and the operation is more humanized.

In actual operation, the processing pipe fitting inserts in cavity 41 along the last through-hole 21 that matches of splint 2, the terminal surface of processing pipe fitting offsets with blade 65 on the knife rest 6, rotate lock screw 31 through rotating handle 33, make upper and lower splint press from both sides tight pipe fitting, insert electric hand drill's wholesale head in the notch 511 of first push rod portion 51, open electric hand drill, push rod 5 and knife rest 6 synchronous rotation this moment, blade 65 on the knife rest 6 cuts the pipe fitting terminal surface, if the terminal surface is not cut smoothly, then apply axial force to the push rod and make the push rod move forward, let blade 65 cut wider terminal surface, when the terminal surface of second push rod portion 52 offsets with first retaining ring 532, push rod 5 will not continue to move forward this moment, avoid blade 65 on the knife rest 6 to cause unnecessary damage to the base.

In this embodiment, a protective cover 8 is included that fits into the insertion slot 412 to prevent more than necessary injury to the operator in the blade on the blade holder 6 during operation, and to improve safety.

The protection cover 8 comprises two protection parts 81, the protection part 81 comprises an insertion part 82 and a protection part 83, the protection part 83 is in an arc structure matched with the outer diameter of the base 4, a convex connecting block 84 is arranged on the insertion part 82, a clamping groove 85 matched with the connecting block 84 is arranged on the protection part 83, specifically, the two protection parts 81 are limited and positioned through the connecting block 84 and the clamping groove 85, the connecting block 84 is matched with the clamping groove 85 for installation, the two protection parts 81 are stably connected, an operator is prevented from directly contacting the knife rest 6 when a cavity for accommodating the knife rest 6 is formed, the connecting block 84 plays a positioning role, another protection part 81 is positioned when the installation is convenient, and the installation efficiency of the protection cover 8 is improved. A rib 86 is provided at a junction between the insertion portion 82 and the shielding portion 83 of the single shielding member 81, and the rib 86 abuts against the base 4, so that the protective cover 8 is prevented from being unnecessarily displaced from the insertion groove 412, thereby causing a safety hazard.

Example two

The mouth flattening device according to the first embodiment of the present invention is different from the first embodiment of the present invention, as shown in fig. 9 to 14, the mouth flattening device further includes a mouth expanding device 7 and a mouth expanding push rod 71, the mouth expanding device 7 includes a conical pressure head 74 and a mouth expanding device body 75, one side of the mouth expanding device body 75 is recessed inwards to form an accommodating cavity 76, a side wall of the accommodating cavity 76 is provided with a thread, a connection portion between the tool holder 6 and the mouth expanding device 7 is provided with a thread matched with the side wall of the accommodating cavity 76, and the conical pressure head 74 is mounted at a central position of the mouth expanding device body 75 through a bearing 77;

the flaring push rod 71 is provided with an annular cavity 73, the side wall of the annular cavity 73 is provided with threads, one side of the base 4 close to the push rod 5 is provided with threads matched with the side wall of the annular cavity 73, a second spring 78 is further arranged between the flaring push rod 71 and the push rod 5, one end of the second spring 78 is connected with a spiral groove 731 which is matched with the second spring 78 and is arranged at the bottom of the annular cavity 73, the other end of the second spring 78 is clamped in an annular groove 521 matched with the second spring 78 and arranged on the push rod 5, the flaring push rod 71 is sleeved and connected with the push rod 5 through an inserting pipe 72 at the central position, the outer side wall of the inserting pipe 72 is provided with a fixture block 721, the push rod 5 is provided with a clamping guide part 55 corresponding to the fixture block 721, the clamping guide part 55 comprises guide grooves 551, a clamping part 553, the fixture block 721 and the guide part, slide to the clamping portion 552 along the guide portion 553, realize that push rod 5 and flaring push rod 71 are fixed circumferentially, when the flaring push rod 71 needs to be dismantled, press flaring push rod 71, make fixture block 721 slide into the guide portion 553 from clamping portion 552, rotate flaring push rod 71 this moment and make fixture block 721 slide to guide way 551 along guide portion 553, and fall out from guide way 551, this kind of dismantlement mode is quick and convenient, high efficiency, preferably, be equipped with the screw hole on the flaring push rod 71, insert the screw along the screw hole and place the clearance of second spring 78 in annular cavity 73 in, spring 78 falls out from flaring push rod 71 when avoiding dismantling flaring push rod 71 with this.

In actual operation, the fixture block 721 on the flaring push rod 71 enters from the guide groove 551 and slides to the clamping portion 552 along the guide portion 553, so that the circumferential fixing of the push rod 5 and the flaring push rod 71 is realized, then the electric screwdriver bit of the electric hand drill is installed into the notch 511 of the first push rod portion 51, the electric hand drill is started and applies axial force to the push rod 5, the thread of the flaring push rod 71 is engaged with the thread on the base 4 through axial movement, and the flaring device 7 rotates and moves axially at the same time, so that the flaring of the pipe fitting is easily realized.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (18)

1. The utility model provides a flat mouthful ware, includes base (4), splint (2), prescribes a limit to subassembly (3), push rod (5) and knife rest (6), be equipped with through-hole (21) of a plurality of differences in size on splint (2), be equipped with on base (4) and be convenient for splint (2) to insert and horizontal gliding cell body (1), after splint (2) insert in cell body (1), prescribe a limit to the position of splint (2) through prescribing a limit to subassembly (3) with through-hole (21) that this location pipe fitting corresponds, characterized in that, be equipped with cavity (41) in base (4), push rod (5) insert in cavity (41) along cavity (41) one end, be equipped with insertion groove (412) on base (4), cavity (41) are arranged in along insertion groove (412) in knife rest (6), push rod (5) one end with knife rest (6) fixed connection and drive knife rest (6) do axial motion and rotary motion in cavity (41), the other end of the push rod (5) is inwards sunken to form a notch (511).

2. The mouth flattening device as claimed in claim 1, wherein the push rod (5) comprises a first push rod part (51), a second push rod part (52), a third push rod part (53) and a fourth push rod part (54), the end of the first push rod part (51) is recessed inwards to form a notch (511) matched with a screwdriver bit, the second push rod part (52) is attached to the wall surface of the cavity (41) of the base (4), a first spring (56) is sleeved outside the fourth push rod part (54), a limiting block (411) is arranged in the cavity (41), the end surfaces of the limiting block (411) and the third push rod part (53) are respectively abutted against the two ends of the first spring (56), and the end of the fourth push rod part (54) is fixedly connected with the tool rest (6).

3. The flat mouth device according to claim 2, wherein the inner side wall of the base (4) protrudes inwards to form a limiting ring (42), a first rolling bearing (531) and a second rolling bearing (541) are respectively arranged at two ends of the limiting ring (42), the first rolling bearing (531) is sleeved on the third push rod portion (53), and the second rolling bearing (541) is sleeved on the tool rest (6).

4. A flat mouth device according to claim 3, wherein a first retaining ring (532) and a second retaining ring (542) are further arranged in the cavity (41), the first retaining ring (532) abuts against the first rolling bearing (531), the second retaining ring (542) abuts against the second rolling bearing (541), and a limiting groove (43) matched with the first retaining ring (532) and the second retaining ring (542) is arranged on the inner side wall of the base (4).

5. A flatting device according to claim 4, characterized in that the base (4) is provided with through-going holes (44) in a position perpendicular to the limiting groove (43).

6. A flatting device as claimed in claim 3, characterized in that the tool holder (6) is provided on one side with a tool head (61) for mounting a blade, and the tool holder (6) is provided on the other side with a coupling groove (62) for facilitating the insertion of the fourth push rod part (54).

7. The mouth flattener according to claim 6, wherein the cutter head (61) is provided with a blade mounting screw hole (64) for facilitating the mounting of the blade (65).

8. The flat mouth machine according to claim 6, wherein the tool holder (6) is provided with a threaded through hole (63), and the fourth push rod part (54) is provided with a threaded hole (543) corresponding to the threaded through hole (63).

9. A flatting device as claimed in claim 6, characterized in that the groove wall of the connecting groove (62) is provided with a thread, and the outside of the fourth push rod part (54) is provided with a thread matching the thread of the groove wall of the connecting groove (62).

10. The mouth flattening device according to claim 1, wherein the limiting component (3) comprises a locking screw (31) and a wave screw (32), the limiting component (3) is provided with a first threaded through hole (12) matched with the locking screw (31) and the wave screw (32) at the upper side and the lower side of the groove body (1), and the clamping plate (2) is provided with a groove (22) corresponding to the end parts of the locking screw (31) and the wave screw (32) at the upper side and the lower side.

11. A flatting device according to claim 10, characterized in that the locking screw (31) is provided with a turning handle (33) at its upper end.

12. The mouth flattening device according to claim 1, further comprising a mouth expanding device (7) and a mouth expanding push rod (71), wherein the mouth expanding device (7) is fixedly connected with the tool rest (6) and moves synchronously with the tool rest (6), the mouth expanding device (7) comprises a conical pressure head (74) and a mouth expanding device body (75), the conical top of the conical pressure head (74) is coaxial with the axis of the mouth expanding device body (75), the mouth expanding push rod (71) is fixedly connected with the push rod (5) and moves synchronously with the push rod (5), the mouth expanding push rod (71) is provided with an annular cavity (73), threads are arranged on the side wall of the annular cavity (73), and threads matched with the threads on the side wall of the annular cavity (73) are arranged on one side of the base (4) close to the push rod (5).

13. The flat mouth device according to claim 12, wherein one side of the flaring device body (75) is recessed inwards to form a containing cavity (76), the side wall of the containing cavity (76) is provided with threads, and the joint of the tool holder (6) and the flaring device (7) is provided with threads matched with the threads on the side wall of the containing cavity (76).

14. The mouth flattening device according to claim 12, wherein the flaring push rod (71) is sleeved with the push rod (5) through an inserting pipe (72) arranged at a central position, a clamping block (721) is arranged on the outer side wall of the inserting pipe (72), a clamping guide portion (55) corresponding to the clamping block (721) is arranged on the push rod (5), the clamping guide portion (55) comprises a guide groove (551), a clamping portion (552) and a guide portion (553), the clamping block (721) enters from the guide groove (551) and slides to the clamping portion (552) along the flaring portion (553), a second spring (78) is further arranged between the push rod (71) and the push rod (5), and the push rod (5) and the flaring push rod (71) are circumferentially fixed through spring force.

15. The mouth flattening device according to claim 14, wherein the second spring (78) is sleeved outside the inserting pipe (72), an annular groove (521) is formed in the end face of the first push rod part (51) on the push rod (5), and the second spring (78) abuts against the bottom of the annular cavity (73) and the annular groove (521) respectively.

16. A flatting device according to claim 15, characterised in that the flared pushrod (71) is further provided with a threaded hole along which a screw is inserted, the end of the screw passing through the second spring (78).

17. The flatting device according to claim 1, characterized in that it further comprises a protective cover (8) matching the insertion slot (412).

18. The flatting device of claim 17, wherein the protection cover (8) comprises two protection parts (81) which are fastened to each other to form a hollow cavity, the protection parts (81) comprise an insertion part (82) and a protection part (83), the protection part (83) is an arc-shaped structure matched with the outer diameter of the base (4), a convex connecting block (84) is arranged on the insertion part (82), a clamping groove (85) matched with the connecting block (84) is arranged on the protection part (83), a convex rib (86) is arranged at the joint of the insertion part (82) and the protection part (83) on the single protection part (81), and the convex rib (86) is abutted against the base (4).

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