CN201605415U

CN201605415U - Lower mold station motion mechanism of automobile deadening felt automatic forming machine

Info

Publication number: CN201605415U
Application number: CN2010201138069U
Authority: CN
Inventors: 姚彩明; 王建忠
Original assignee: SHUANGLONG NON-WOVEN EQUIPMENT Co Ltd CHANGSHU CITY
Current assignee: SHUANGLONG NON-WOVEN EQUIPMENT Co Ltd CHANGSHU CITY
Priority date: 2010-02-04
Filing date: 2010-02-04
Publication date: 2010-10-13
Anticipated expiration: 2020-02-04

Abstract

A lower mold station motion mechanism of an automobile deadening felt automatic forming machine belongs to automobile interior ornament forming machinery. The automobile deadening felt automatic forming machine comprises a seat, a lower mold walking guide laid on the seat and a lower mold arranged on the lower mold walking guide in a matched manner. The lower mold station motion mechanism comprises a drive device, a trolley guide, a trolley and a driven device, wherein the trolley guide is laid on the seat, the drive device is disposed on the seat and corresponds to one end of the trolley guide, the driven device is disposed on the seat and corresponds to the other end of the trolley guide, the trolley is arranged on the trolley guide in a matched manner, one end of the trolley is connected with the drive device, the other end of the trolley is connected with the driven device, a stopper is arranged on the upper side of the middle in a length direction of the trolley, the lower mold is arranged on a lower mold seat, shifters are fixed at the bottoms of edges of the lower mold seat, and the stopper corresponds to the shifters. The lower mold station motion mechanism of an automobile deadening felt automatic forming machine has simple structure, and is matched with the shifters on the lower mold seat of the lower mold so as to drive the lower mold to move on the lower mold walking guide.

Description

The lower mold station movement mechanism of automatic molding machine for automotive sound-proof felt

Technical field

The utility model belongs to automotive upholstery forming machine technical field, is specifically related to a kind of lower mold station movement mechanism of automatic molding machine for automotive sound-proof felt.

Background technology

Automotive sound-proof felt is obtained with the repressed moulding of mixing of natural fabric such as flax fibre by low-melting thermoplastic fibre such as polypropylene fiber etc. or low-melting fiber usually.Chinese invention patent application publication number CN101549671A discloses a kind of fibrilia automobile inner decoration member and production method thereof, this method recommends that two kinds of moulding process are arranged, and the one, becoming felt, slicing treatment, air cooking and surface bonding, hot-forming raw material shredding processing, mixing, carding, acupuncture is sheet material, slicing treatment, baking oven for heating and cold moudling; The 2nd, raw material shredding processing, mixing, carding, acupuncture become felt, slicing treatment, baking oven for heating and the bonding and cold moudling in surface.There is following shortcoming in above-mentioned patent application technical scheme: one, and processing step is many, makes process tediously long, and because used device is many, each process procedure need be sent the post workman, so labour's input amount is big; The 2nd, the production capacity that inside gadget is produced is low, i.e. yield poorly in the unit interval, is unfavorable for the high efficiency production of enterprise; The 3rd, energy resource consumption is big, first kind of moulding process with first-selection is example, need utilize heat energy air cooking, hot-forming and oven heat, needing machine acupuncture in addition, slicer section and chilling press cold moudling all need consume a large amount of electric energy, therefore do not satisfy economizing type and the energy-saving economic requirement of being advocated by the whole society at present.China utility model patent Granted publication CN2122781U has disclosed a kind of automotive upholstery former, because this patent scheme is directed to the compression moulding of the car carpeting of working of plastics, thereby do not have referential technical meaning for the moulding of automotive sound-proof felt.Publication number CN101024387A has introduced a kind of automotive upholstery and manufacture method thereof, and this method has solved the fixedly adhesive bond problem between the buckle and skeleton base material, does not have reference equally for the moulding of automotive sound-proof felt.

Along with the develop rapidly of Domestic Automotive Industry, how to improve the production efficiency of automotive sound-proof felt and how in the process of producing automotive sound-proof felt the problem of energy savings more and more be subjected to automobile production manufacturer and be the supporting particularly concern of automotive trim production firm of auto parts and components enterprise of car load factory.At present, two-step method is produced automotive sound-proof felt and is acknowledged as a kind of comparatively desirable scheme, and is generally adopted by automotive upholstery production firm.Concrete process is: the first step, and fiber opening processing, air lay, hot blast typing and cooling cutting obtain semi-finished product; In second step,, obtain automotive sound-proof felt to hot-forming after semi-finished product feed supplement, baking oven for heating and the baking oven for heating.This two-step process is for the technology that aforesaid CN101549671A recommends, all gain ground in the raising of production capacity and the saving of the energy, but still there is following shortcoming: at first, whenever obtain a finished product and need 16-20min consuming time, whole production is worked online by 6-8 name workman at least, thereby production efficiency still pind down, and human resources and cost have high input; Secondly, the rough surface of deadening felt and concavo-convex phenomenon are serious, and the quality of product is affected; Also have, in the technical process of the first step, fiber carries out the hot blast typing through entering tediously long (about about 20 meters) drying room behind the air lay, go out to cool off behind the drying room to use with cutting and obtain semi-finished product and promptly obtain the automotive sound-proof felt base, in the second step process process, semi-finished product and feed supplement piece are together put into the baking oven baking, then be pressed, after cooling off, take out, therefore have cooling procedure twice, thereby cause energy resource consumption to increase.

From the above, at present the two-step method that adopts is produced automotive sound-proof felt a kind of method of doing something against one's will of can only saying so, because disconnect between the process in the first step and second step, there is the pause process promptly, therefore if having and a kind ofly accomplish without any letup from fiber to the deadening felt finished product at same make-up machine, the problems referred to above can be solved so.But there is no from present disclosed non-patent literature and patent documentation allly has the enlightenment of relevant technology, and also hears the report that has production firm to succeed in developing.For this reason, the applicant has passed through exploration and practice for many years, finds a way to resolve the problem, and has designed the automatic moulding machine that can obtain automotive sound-proof felt with one-step method, can realize producing from fiber to the nothing pause in the deadening felt finished product overall process.Because the automatic molding machine for automotive sound-proof felt of one-step method has four stations, be feed supplement station, precompressed station, lapping station and hot-forming station, therefore counterdie needs to move in order between four stations, for example, after the feed supplement of feed supplement station, move to hot blast precompressed station, after the precompressed of hot blast precompressed station, move to lapping station lay-up fiber web, move to hot-forming station and implement hot blast heating compression moulding (finished product) behind lapping station lay-up fiber web, the machine of realizing is so again and again produced continuously.

Above-mentioned automatic molding machine for automotive sound-proof felt (the separate case application has patent) by the applicant's development and Design has four stations, three covers i.e. three counterdies (also claiming shaping mould), an one cover hot blast precompressed patrix and a cover hot blast heating are pressed into pattern, three counterdies need cyclic transformation campaign between four stations, need make three counterdies be able to move to next station from previous station in an orderly manner, the then essential rational lower mold station movement mechanism of dependency structure, here the notion of being said rational in infrastructure is meant: should ensure the counterdie motion, keep lower mold station movement mechanism self to be in static state again, i.e. movement relation of not following in sb's footsteps with patrix, the applicant has done arduous design for this reason, and technical scheme described below produces under this prerequisite.

Summary of the invention

Task of the present utility model be to provide a kind of simple in structure, cooperate rationally and can ensure the lower mold station movement mechanism of the automatic molding machine for automotive sound-proof felt that counterdie moves with counterdie between different stations.

Task of the present utility model is finished like this, a kind of lower mold station movement mechanism of automatic molding machine for automotive sound-proof felt, described automatic molding machine for automotive sound-proof felt comprises support, be laid on the support counterdie walking guide rail and be provided in counterdie on the counterdie walking guided mode, described lower mold station movement mechanism comprises aggressive device, vehicle guide, dolly and passive device, vehicle guide is laid on the described support, aggressive device is arranged on the support and corresponding to an end of described vehicle guide, passive device is located on the support and corresponding to the other end of vehicle guide, dolly is provided on the vehicle guide, one end of this dolly is connected with aggressive device, and the other end is connected with passive device, and above the middle part of the length direction of dolly, has collision block, described counterdie is located on the die shoe, and being installed with shifting block in the bottom of each edge of die shoe, described collision block is corresponding with described shifting block.

In a specific embodiment of the present utility model, described aggressive device comprises motor, driving wheel, driving belt and support, support is fixed on the described support, motor is located on the support, driving wheel is fixed on the motor shaft of electricity, and corresponding to an end of described vehicle guide, an end of driving belt is connected with an end of described dolly, and the other end is connected with the other end of dolly; Described passive device comprises follower and governing mechanism of tension, governing mechanism of tension is located on the described support, follower is located on the passive wheel shaft, and passive wheel shaft pivot is arranged on the governing mechanism of tension and corresponding to the other end of described vehicle guide, and that the middle part of described driving belt is set in is main, on the follower.

In another specific embodiment of the present utility model, be installed with a motor cabinet fixed head on the described support, on the motor cabinet fixed head, be installed with a motor cabinet, described motor is installed on the motor cabinet.

In another specific embodiment of the present utility model, described motor is installed on the described motor cabinet with horizontally-arranged state.

In another specific embodiment of the present utility model, described motor is a clockwise and anticlockwise motor.

Also have in the specific embodiment of the present utility model, described master, follower are belt pulley or sprocket wheel, and described driving belt is belt or chain.

More of the present utility model and in specific embodiment, described governing mechanism of tension comprises supporting base, follower adjustment axle bed and adjusts the axle bed supporting plate, supporting base is installed on the described support, adjusting the axle bed supporting plate is installed on the supporting base, follower is adjusted axle bed and is provided in movably on the adjustment axle bed supporting plate, and described passive wheel shaft pivot is arranged on follower and adjusts on the axle bed.

In of the present utility model and then specific embodiment, described adjustment axle bed supporting plate is equipped with one towards the position placed in the middle of the length direction of described follower adjustment axle bed one side and is moved boss, and described follower is adjusted the position placed in the middle of length direction of the bottom of axle bed and is concaved with one and moves groove, and this moves groove and matches with described mobile boss.

Of the present utility model again more and in specific embodiment, the position placed in the middle of the length direction of described adjustment axle bed supporting plate offers an adjustment locating slot that connects described mobile boss, is equipped with at least one and is used to limit the dog screw that described follower adjustment axle bed moves on the adjustment locating slot; The shape of cross section of described mobile boss and mobile groove all is swallow-tail form.

In again of the present utility model and then specific embodiment, the two ends of described dolly respectively are furnished with a pair roller, the vehicle guide groove of roller and described vehicle guide constitutes rolling pair, above the middle part of the length direction of dolly, constitute a trapezoid boss, described collision block has a pair of, is fixed on the corresponding both sides of described trapezoid boss with facing each other.

The technical scheme that the utility model provides not only structure is terse, and can with the shifting block excellent fit friend on the die shoe of counterdie, order about counterdie and on counterdie walking guide rail, move, make counterdie move to another station from a station.

Description of drawings

Fig. 1 is a specific embodiment structure chart of the present utility model.

Fig. 2 is the schematic diagram of counterdie walking guide rail of the present utility model.

The specific embodiment

For the auditor that the makes Patent Office especially public can be expressly understood technical spirit of the present utility model and beneficial effect more, the applicant general elaborates in conjunction with the accompanying drawings in the mode of embodiment below, but to the description of embodiment all is not restriction to the utility model scheme, any according to the utility model design done only for pro forma but not substantial equivalent transformation all should be considered as the technical solution of the utility model category.

Ask for an interview Fig. 1 and Fig. 2, in Fig. 1 and Fig. 2, provided the counterdie walking guide rail 2 of automatic molding machine for automotive sound-proof felt, counterdie walking guide rail 2 is made of the vertical, horizontal track 21,22 of be connected to each other (linking), vertical, horizontal track 21,22 is laid on the support 1, promptly be fixed on the support 1, the counterdie of illustrating among Fig. 13 (also claiming shaping mould, as follows) forms rolling pair with vertical, horizontal track 21,22.Specifically by shown in Figure 1, counterdie 3 is furnished with die shoe 31, four bights in the bottom of die shoe 31 respectively are provided with counterdie walking roller 32, counterdie walking roller 32 matches with the long rails groove 211 of long rails 21 and the cross track groove 221 of cross track 22, vertical, cross track 21,22 intersection all is furnished with rotary disk 8, when four counterdie walking rollers 32 of counterdie 3 arrive at the rotary disk roller groove 81 (cross bath) of corresponding four rotary disks 8 when locating, make rotary disk 8 rotate 90 ° by the rotary disk actuating device 82 (Fig. 2 shows) that is connected with rotary disk 8, promptly alter course thereby make counterdie 3 become rail, so that counterdie 3 enters another station from a station.Please specifically see Fig. 1, position, edge and middle part in the bottom of aforesaid die shoe 31 respectively are installed with a shifting block 311, this shifting block 311 is used for for matching with the following lower mold station movement mechanism that also will describe in detail, respectively be provided with guide block 312 and guide pillar 313 that quantity and shape all are not subjected to restriction shown in Figure 1 around the top of die shoe 31, guide block 312 and guide pillar 313 are pressed into pattern match (during matched moulds) for matching with patrix promptly with pre-mould of hot blast (patrix) and hot blast heating.

Please see Fig. 1 by emphasis, above-mentioned explanation according to the applicant, particularly according to the signal of Fig. 2, should know, on the support 1 of an automatic molding machine for automotive sound-proof felt, have four lower mold station movement mechanisms of the present utility model that structure is identical, and the duty of four lower mold station movement mechanisms is consistent, i.e. all work of a job, and one stops all stopping.Though only show one among Fig. 1, cause puzzlement can't for those of skill in the art's understanding.It is preferred but not the lower mold station movement mechanism automotive sound-proof felt automatic moulding that is limited to is as follows that the applicant provides: comprise the master, passive device 4,7, vehicle guide 5 and dolly 6, vehicle guide 5 (there is shown a pair of by one group of vehicle guide holder 52, but should do not illustrated restricted number) be fixed on the support 1 parallel mutually with cross slide way 22, and be positioned at the outside of an outmost cross slide way 22, dolly 6 is essentially a movable plate or claims movable stand, respectively is furnished with a pair roller 62 at the two ends of this dolly 6, roller 62 constitutes rolling pair with the vehicle guide groove 51 of aforesaid vehicle guide 5, promptly taking dolly 6 by two pair rollers 62 moves along vehicle guide 5, on the top of the length direction of dolly 6 and position placed in the middle be extended with a shape and be trapezoidal trapezoid boss 63, a pair of collision block 61 is fixed on the both sides of trapezoid boss 63 with facing each other with bolt 611.Certainly, collision block 61 also can be integrally formed with trapezoid boss 63 on the corresponding wall body of trapezoid boss 63, in addition, collision block 63 also can substitute with the thrust that is similar to pin, post or bead and so on the wall body surface that protrudes in trapezoid boss 63, as long as can satisfy the requirement that matches with aforesaid shifting block 311, so the collision block 61 that exemplifies of applicant is not subjected to the restriction of embodiment.Aggressive device 4 be located on the support 1 and corresponding to an end of vehicle guide 5 promptly corresponding to right-hand member shown in Figure 1, the aggressive device 4 that present embodiment is recommended comprises motor 41, driving wheel 42, driving belt 43 and support 44, support 44 is fixing with support 1, on support 44, also be fixed with a motor cabinet fixed head 441 with screw 4412, and on motor cabinet fixed head 441, be installed with a motor cabinet 4411, the motor of motor 41 for having the rotating function, be fixed on the motor cabinet 4411 with cantilever position with horizontally-arranged state or title, driving wheel 42 is fixed on the motor shaft 411 of motor 41, and right-hand member corresponding to vehicle guide 5, promptly corresponding to the notch position of the right-hand member of vehicle guide groove 51, one end of driving belt 43 is connected with an end of dolly 6 (illustrated right-hand member), and the other end then is connected with the other end (illustrated left end) of dolly 6.Passive device 7 be located on the support 1 and corresponding to the other end of vehicle guide 5 promptly corresponding to left end shown in Figure 1.The passive device 7 that present embodiment is recommended comprises follower 71 and governing mechanism of tension 72, follower 71 pivots are arranged on the governing mechanism of tension 72, and left end corresponding to vehicle guide 5, promptly corresponding to the notch position of the left end of vehicle guide 51, the middle part of aforesaid driving belt 43 be nested with lead, on the follower 41,71.Governing mechanism of tension 72 comprises supporting base 721, follower adjustment axle bed 722 and adjusts axle bed supporting plate 723, supporting base 721 is fixed by bolts on the support 1, be fixed on the supporting base 721 and adjust axle bed supporting plate 723, follower is adjusted axle bed 722 and is slidingly matched with adjustment axle bed supporting plate 723, aforesaid follower 71 is fixed on an end of passive wheel shaft 711, and the other end of passive wheel shaft 711 is arranged on the follower adjustment axle bed 722 rotationally by bearing.For so that follower is adjusted axle bed 722 moves adjusting on the axle bed supporting plate 723, therefore extended (being processed with) and moved boss 7231 adjusting axle bed supporting plate 723 adjusts a side surperficial of axle bed 722 and occupy length direction towards (face) follower middle part, in order to repay mobile boss 7231, therefore be concaved with (being processed with) at the middle part that follower is adjusted the bottom of axle bed 722 and occupy length direction and move groove 7221, insert mobile boss 7231 in the mobile groove 7221.After adjusting the position, implement fixing for follower being adjusted axle bed 722, therefore on adjustment axle bed supporting plate 723, offer an adjustment locating slot 7232 that runs through mobile boss 7231, that is to say to offer and adjust locating slot 7232 at the position placed in the middle of the length direction of mobile boss 7231, on adjustment locating slot 7232, set a pair of dog screw 7233, see through 7232 pairs of followers adjustment of adjustment locating slot axle bed 722 by a pair of dog screw 7233 and implement to locate (fixing).Preferred scheme all is processed into the shape that shape of cross section is swallow-tail form with mobile boss 7231 and mobile groove 7221.Aforesaid master,

follower

41,71 both can be belt pulleys, also can be sprocket wheels, with example, aforesaid driving belt 43 both can be a belt, also can be chain, and present embodiment is selected the latter, promptly fill the post of main,

follower

41,71, fill the post of driving belt 43 by chain by sprocket wheel.In the time will implementing to adjust to the tension force of driving belt 43, so as long as pine is opened dog screw 7233, make follower adjust axle bed 722 and on adjustment axle bed supporting plate 723, make move left and right (is example with present location status shown in Figure 1), again dog screw 7233 is located after adjustment finishes.Be arranged on the follower adjustment axle bed 722 because passive wheel shaft 711 is pivots, therefore, when follower adjustment axle bed 722 was done the displacement adjusting, the Portable quilt axis of a movable block 711 was adjusted, and made driving belt 43 obtain reasonable tension.

Aforesaid lower mold station movement mechanism is before corresponding both sides illustrated in figures 1 and 2 are, a rear side and a left side, respectively there is a cover on the right side, existing applicant is that example is described operation principle with (cover) lower mold station movement mechanism that is shown among Fig. 1, when the counterdie 3 that comes from a pair of long rails 21 alters course via the rotary disk actuating device 82 that Fig. 2 illustrates, make rotary disk 81 turn over 90 °, the counterdie walking roller 32 of counterdie 3 turns over 90 °, correspond to a pair of cross track 22, simultaneously, aggressive device 4 work of horizontal station motion down, counterdie 3 right-to-lefts that will be positioned on a pair of cross track 22 are passed, specifically: under the work of motor 41, make driving wheel 42 motions, drive driving belt 43, drive dolly 6 to left movement by driving belt 43, collision block 61 on the dolly 6 contacts with shifting block 311 on the die shoe 31 of counterdie 3, counterdie 3 is driven to the left end of a pair of cross slide way 22, and then, motor 41 counter-rotatings, make dolly 6 be returned to original position, so that once more to arrive by becoming rail and by (promotion) counterdie 3 effects that the lower mold station movement mechanism of the present utility model corresponding to longitudinal rail 21 places is driven to, three counterdies 3 wheel on by four stations shown in Figure 2 is ploughed requires to move according to the rhythm and pace of moving things established technology of setting.

Claims

1. the lower mold station movement mechanism of an automatic molding machine for automotive sound-proof felt, described automatic molding machine for automotive sound-proof felt comprises support (1), be laid on the support (1) counterdie walking guide rail (2) and be provided in walk counterdie (3) on the guided mode (2) of counterdie, it is characterized in that described lower mold station movement mechanism comprises aggressive device (4), vehicle guide (5), dolly (6) and passive device (7), vehicle guide (5) is laid on the described support (1), aggressive device (4) is arranged on that support (1) is gone up and corresponding to an end of described vehicle guide (5), passive device (7) is located at that support (1) is gone up and corresponding to the other end of vehicle guide (5), dolly (6) is provided on the vehicle guide (5), one end of this dolly (6) is connected with aggressive device (4), and the other end is connected with passive device (7), and the top at the middle part of the length direction of dolly (6) has collision block (61), described counterdie (3) is located on the die shoe (31), and being installed with shifting block (311) in the bottom of each edge of die shoe (31), described collision block (61) is corresponding with described shifting block (311).

2. the lower mold station movement mechanism of automatic molding machine for automotive sound-proof felt according to claim 1, it is characterized in that described aggressive device (4) comprises motor (41), driving wheel (42), driving belt (43) and support (44), support (44) is fixed on the described support (1), motor (41) is located on the support (44), driving wheel (42) is fixed on the motor shaft (411) of motor (41), and a end corresponding to described vehicle guide (5), one end of driving belt (43) is connected with an end of described dolly (6), and the other end is connected with the other end of dolly (6); Described passive device (7) comprises follower (71) and governing mechanism of tension (72), governing mechanism of tension (72) is located on the described support (1), follower (71) is located on the passive wheel shaft (711), and passive wheel shaft (711) pivot is arranged on that governing mechanism of tension (72) is gone up and corresponding to the other end of described vehicle guide (5), and that the middle part of described driving belt (43) is set in is main, on the follower (42,71).

3. the lower mold station movement mechanism of automatic molding machine for automotive sound-proof felt according to claim 2, it is characterized in that being installed with on the described support (44) a motor cabinet fixed head (441), be installed with a motor cabinet (4411) on motor cabinet fixed head (441), described motor (41) is installed on the motor cabinet (4411).

4. the lower mold station movement mechanism of automatic molding machine for automotive sound-proof felt according to claim 3 is characterized in that described motor (41) is installed on the described motor cabinet (4411) with horizontally-arranged state.

5. according to the lower mold station movement mechanism of claim 2 or 3 or 4 described automatic molding machine for automotive sound-proof felt, it is characterized in that described motor (41) is a clockwise and anticlockwise motor.

6. the lower mold station movement mechanism of automatic molding machine for automotive sound-proof felt according to claim 2 is characterized in that described master, follower (42,71) are belt pulley or sprocket wheel, and described driving belt (43) is belt or chain.

7. the lower mold station movement mechanism of automatic molding machine for automotive sound-proof felt according to claim 2, it is characterized in that described governing mechanism of tension (72) comprises supporting base (721), follower adjustment axle bed (722) and adjusts axle bed supporting plate (723), supporting base (721) is installed on the described support (1), adjusting axle bed supporting plate (723) is installed on the supporting base (721), follower is adjusted axle bed (722) and is provided in movably on the adjustment axle bed supporting plate (723), and described passive wheel shaft (711) pivot is arranged on follower and adjusts on the axle bed (722).

8. the lower mold station movement mechanism of automatic molding machine for automotive sound-proof felt according to claim 7, it is characterized in that described adjustment axle bed supporting plate (723) is equipped with one towards the position placed in the middle that described follower is adjusted the length direction of axle bed (722) one sides and moves boss (7231), and described follower is adjusted the position placed in the middle of length direction of the bottom of axle bed (722) and is concaved with one and moves groove (7221), and this moves groove (7221) and matches with described mobile boss (7231).

9. the lower mold station movement mechanism of automatic molding machine for automotive sound-proof felt according to claim 8, the position placed in the middle that it is characterized in that the length direction of described adjustment axle bed supporting plate (723) offers an adjustment locating slot (7232) that connects described mobile boss (7231), is equipped with at least one and is used to limit the dog screw (7233) that described follower adjustment axle bed (722) moves on adjustment locating slot (7232); The shape of cross section of described mobile boss (7231) and mobile groove (7221) all is swallow-tail form.

10. the lower mold station movement mechanism of automatic molding machine for automotive sound-proof felt according to claim 1, the two ends that it is characterized in that described dolly (6) respectively are furnished with a pair roller (62), roller (62) constitutes rolling pair with the vehicle guide groove (51) of described vehicle guide (5), top at the middle part of the length direction of dolly (6) constitutes a trapezoid boss (63), described collision block (61) has a pair of, is fixed on the corresponding both sides of described trapezoid boss (63) with facing each other.