CN205559459U

CN205559459U - Pressurizer is glued to point

Info

Publication number: CN205559459U
Application number: CN201620345052.7U
Authority: CN
Inventors: 彭健
Original assignee: Dongguan Good Mark New Precision Technology Co Ltd
Current assignee: Dongguan Good Mark New Precision Technology Co Ltd
Priority date: 2016-04-21
Filing date: 2016-04-21
Publication date: 2016-09-07
Anticipated expiration: 2026-04-21

Abstract

The utility model discloses a pressurizer is glued to point, include preloading device and the locking device who locks preloading device, wherein preloading device includes bottom plate and apron, preloading device still just is used for the product card tie member of chucking fuselage side and sets up the lid chucking spare that just is used for with the bottom plate chucking to the side of the apron at the bottom plate side including the setting, lid chucking spare is two at least, it has a lid chucking spare to lap at least distribution the in two relative sides, the product card tie member is two at least, two sides that the bottom plate is relative distribute at least and have a product card tie member. Locking device includes pressurize upper cover, pressurize lower cover and installs that in insurance validity to push down the lid inside, and is used for the slider locking device of compacting machine body side, and slider locking device's lateral surface is equipped with slider motion inclined plane, and the inside of pressurize upper cover is equipped with the slider oriented slant with slider motion beveled laminate. The application provides a pressurizer is glued to point is when improving the gluey pressurize quality of electronic product point, and its commonality improves.

Description

Point glue pressurizer

Technical field

This utility model relates to electronic product point glue processing technique field, particularly to one point glue Pressurizer.

Background technology

In the assembling process of electronic product, such as mobile phone, MP4 or MP5 etc., especially exist On mobile phone Metal decorative part, electronic product side frame forms by multiple edge strips are the most bonding, for Guarantee bonding quality, after electronic product point glue by a glue pressurizer pressing.

Traditional some glue pressurizer includes pre-tightening apparatus and the locking dress locked by pre-tightening apparatus Putting, wherein pre-tightening apparatus includes base and top cover, and locking device is base and top cover to be fastened Buckle, wherein base be upper surface for the base plate abutted with fuselage, top cover is and table on fuselage The cover plate that face abuts, during use, is placed on the fuselage after a glue on base, then by cover plate It is placed on fuselage upper surface, finally by buckle by cover plate and base plate pressing, the side of buckle Abut with fuselage side, and then realize the limiting locking to fuselage side.

But, owing to base is only the base plate that upper surface abuts with fuselage, at a glue pressurizer During assembling, just put glue due to fuselage side and completed, under side does not has the effect of pressure, The easily deformation or flick under the effect of self-acting power of the edge strip of fuselage, and cover plate is only and machine The cover plate that surface abuts with it, during a glue pressurizer assembles, owing to cover plate is simple It is placed on fuselage, it is impossible to realize fuselage pretension smoothly so that the some glue pressurize matter of electronic product Measure poor.

On the other hand, locking device is only buckle, and is supported with fuselage side by the side of buckle Connect and realize fuselage side limiting locking, and then cause the some glue pressurizer of every kind of model to use In the fuselage locking a kind of model so that the versatility of some glue pressurizer is relatively low.

Therefore, how while improving electronic product point glue pressurize quality, improve some glue pressurize The versatility of device, is those skilled in the art's technical problems urgently to be resolved hurrily.

Utility model content

The purpose of this utility model is to provide a kind of some glue pressurizer, to improve electronic product While some glue pressurize quality, improve the versatility of some glue pressurizer.

For achieving the above object, this utility model provides one point glue pressurizer, including pretension Device and the locking device that pre-tightening apparatus is locked, described pre-tightening apparatus includes base plate and cover plate, Described pre-tightening apparatus also includes being arranged on described base plate side and the product for clamping fuselage side Fastener and be arranged on described cover plate side and for the lid Fastener with base plate clamping, described Lid Fastener at least two, two sides that described cover plate is relative are at least distributed an institute State lid Fastener, described product Fastener at least two, two sides that described base plate is relative Face is at least distributed a described product Fastener；

Described locking device includes pressurize upper cover, pressurize lower cover and is arranged in described pressurize lower cover Portion, and for compressing the slider locking device of fuselage side, the outside of described slider locking device Face is provided with slide block movement inclined-plane, and the inside of described pressurize upper cover is provided with and described slide block movement inclined-plane The slider guide inclined-plane of laminating.

Preferably, it is elastic that the surface described slider locking device contacted with fuselage is provided with pressurize Layer.

Preferably, described slider locking device includes along the extension of described pressurize lower cover length direction Length pressurize slide block, the width pressurize slide block extended along described pressurize lower cover width and setting At described pressurize lower cover knuckle, and medial surface can be used in abutting with fuselage side excessive sliding Block, the medial surface of described excessive slide block is arc, and described length pressurize slide block, described width are protected It is equipped with described pressurize elastic layer on pressure slide block and described excessive slide block.

Preferably, described length pressurize slide block is two, and two described length pressurize slide blocks are symmetrical It is distributed in described pressurize lower cover length direction both sides；

Described width pressurize slide block is two, and two described width pressurize slide blocks are symmetrically distributed in institute State pressurize lower cover width both sides；

Described excessive slide block is four, and each described length pressurize slide block and described width pressurize are sliding A described excessive slide block it is provided with between block.

Preferably, described product Fastener is elasticity arm, and described product Fastener passes through securing member It is arranged on described base plate.

Preferably, described securing member is threaded fastener, described product Fastener and described fastening Part matched in clearance, described product Fastener is multiple, and multiple described product Fasteners are symmetrical In described base plate opposite sides.

Preferably, the upper surface of described base plate is provided with base plate alignment pin, and described base plate alignment pin is Two, two described base plate alignment pins be positioned at described base plate relative to knuckle at.

Preferably, the cover plate alignment pin being arranged on described cover plate lower surface, described lid are also included Plate alignment pin is two, and two described cover plate alignment pins are distributed along described cover plate length direction.

Preferably, cover under described pressurize and be provided with for housing the spacing of described slider locking device Chute.

Preferably, under described pressurize, it is covered with four alignment pins, described pressurize is covered with for institute Stating the hole, location that alignment pin passes, four described alignment pins lay respectively at the four of described pressurize lower cover At individual knuckle.

In technique scheme, the some glue pressurizer that this utility model provides includes that pretension fills The locking device put and locked by pre-tightening apparatus, wherein pre-tightening apparatus includes base plate, cover plate, sets Put base plate side and the product Fastener for clamping fuselage side and be arranged on cover plate side and For the lid Fastener with base plate clamping, lid Fastener at least two, cover plate is relative Two sides are at least distributed a lid Fastener, product Fastener at least two, base plate Two relative sides are at least distributed a product Fastener.Locking device include pressurize upper cover, Pressurize lower cover and being arranged on inside pressurize lower cover, and for compressing the slider locking dress of fuselage side Putting, the lateral surface of slider locking device is provided with slide block movement inclined-plane, and the inside of pressurize upper cover is provided with Slider guide inclined-plane with the laminating of slide block movement inclined-plane.When needs use some glue pressurizer, First fuselage is placed on, then by the product Fastener of bottom panel side by fuselage Side clamping, is then pressed in body upper by cover plate, then pass through lid Fastener by cover plate with Base plate is fixed.Then pre-tightening apparatus is placed under pressurize and cover, then pressurize upper cover is fastened on Covering under pressurize, wherein fit with slider guide inclined-plane in slide block movement inclined-plane, holds at pressurize upper cover The continuous process pressed down, pressurize upper cover promotes slider locking device to move, directly near fuselage direction Fit with fuselage side to slider locking device, complete locking operation.

By foregoing description, in the some glue pressurizer that this utility model provides, pass through Product Fastener is set at base plate side so that when fuselage is placed at the beginning, Realize spacing to fuselage side, it is to avoid fuselage side deformation situation, improve fuselage to effect Some glue pressurize quality.By arranging slider locking device at pressurize lower cover, and by pressurize Lid promotes slider locking device, according to the concrete size of fuselage, sets pressurize upper cover depression degree, And then the pressurize meeting sizes fuselage works, therefore, the some glue pressurize dress that the application provides Putting while improving electronic product point glue pressurize quality, its versatility improves.

Accompanying drawing explanation

The structural representation of the some glue pressurizer that Fig. 1 is provided by this utility model embodiment；

The explosive view of the some glue pressurizer that Fig. 2 is provided by this utility model embodiment；

Base plate that Fig. 3 is provided by this utility model embodiment and the structural representation of product shackle member Figure.

Wherein in Fig. 1-3: 1-fuselage, 2-cover plate, 3-base plate, 3-1-base plate alignment pin, 3-2- Lightening hole, 3-3-securing member, 4-pressurize lower cover, 5-slider locking device, 5-1-length pressurize are slided Block, 5-2-width pressurize slide block, the excessive slide block of 5-3-, 6-pressurize upper cover, 7-product Fastener, 8-handle.

Detailed description of the invention

Core of the present utility model is to provide a kind of some glue pressurizer, to improve electronic product While some glue pressurize quality, improve the versatility of some glue pressurizer.

In order to make those skilled in the art be more fully understood that the technical solution of the utility model, under Face combines drawings and embodiments, and the utility model is described in further detail.

Refer to Fig. 1 to Fig. 3, in a kind of detailed description of the invention, this utility model is specifically real The point glue pressurizer that executing example provides includes pre-tightening apparatus and the locking dress locked by pre-tightening apparatus Putting, wherein pre-tightening apparatus includes base plate 3, cover plate 2, is arranged on base plate 3 side and for clamping The product Fastener 7 of fuselage 1 side and be arranged on cover plate 2 side and for base plate 3 clamping Lid Fastener, lid Fastener at least two, relative two sides of cover plate 2 are at least A lid Fastener be distributed, product Fastener 7 at least two, base plate 3 relative two Individual side is at least distributed a product Fastener 7.Wherein, lid Fastener can be two, Cover plate 2 long side is respectively distributed a lid Fastener, certainly, overall in order to improve cover plate 2 Clip stability, it is preferable that cover plate 2 long side is respectively provided with multiple lid Fastener, and multiple lid Body Fastener is symmetrically distributed in cover plate 2 both sides.Concrete, lid Fastener is specifically as follows bullet Property shackle member.Product Fastener 7 can be iron plate structure or working of plastics, and product Fastener 7 can To be bonded on base plate 3.Concrete, product Fastener 7 can be two, the long side of base plate 3 Limit is respectively distributed a product Fastener 7.

Locking device includes pressurize upper cover 6, pressurize lower cover 4 and is arranged on pressurize lower cover 4 inside, And for compressing the slider locking device 5 of fuselage 1 side, the lateral surface of slider locking device 5 Being provided with slide block movement inclined-plane, the inside of pressurize upper cover 6 is provided with and the cunning of slide block movement inclined-plane laminating Block guiding surface.

When needs use some glue pressurizer, first fuselage 1 is placed on base plate 3, so Afterwards by the product Fastener 7 of base plate 3 side by the side clamping of fuselage 1, then by cover plate 2 are pressed in above fuselage 1, then pass through lid Fastener and are fixed with base plate 3 by cover plate 2.So After pre-tightening apparatus is placed on pressurize lower cover 4, then pressurize upper cover 6 is fastened on pressurize lower cover On 4, wherein fit in slide block movement inclined-plane and slider guide inclined-plane, pressurize upper cover 6 persistently under The process of pressure, pressurize upper cover 6 promotes slider locking device 5 to move near fuselage 1 direction, Until slider locking device 5 is fitted with fuselage 1 side, complete locking operation.

By foregoing description, in the some glue pressurize that this utility model specific embodiment is provided In device, by arranging product Fastener 7 at base plate 3 side so that fuselage 1 is put at the beginning When putting on base plate 3, can realize fuselage 1 side is spacing, it is to avoid fuselage 1 side shape Deformation, improves to effect the point glue pressurize quality of fuselage 1.By setting at pressurize lower cover 4 Put slider locking device 5, and promote slider locking device 5, according to fuselage by pressurize upper cover 6 1 concrete size, sets pressurize upper cover 6 depression degree, and then meets sizes fuselage 1 Pressurize works, and therefore, the some glue pressurizer that the application provides is improving 1 glue pressurize of fuselage While quality, its versatility improves.

Preferably, surface slider locking device 5 contacted with fuselage 1 is provided with pressurize elastic layer. Concrete, pressurize elastic layer can be formed by traditional elastic plastic processing, in order to extend pressurize bullet The service life of property layer, it is preferable that pressurize elastic layer is vibration damping layer of silica gel.

Concrete, slider locking device 5 includes the length extended along pressurize lower cover 4 length direction Pressurize slide block 5-1, the width pressurize slide block 5-2 extended along pressurize lower cover 4 width and setting At pressurize lower cover 4 knuckle, and medial surface can be used in abutting with fuselage 1 side excessive sliding Block 5-3.Wherein, the medial surface of excessive slide block 5-3 is arc, length pressurize slide block 5-1, width It is equipped with pressurize elastic layer on degree pressurize slide block 5-2 and excessive slide block 5-3.Wherein, under pressurize Cover the 4 each sides of length direction and can be provided with multiple length pressurize slide block 5-1, for the ease of work Make personnel installation length pressurize slide block 5-1, it is preferable that length pressurize slide block 5-1 is two, two Length pressurize slide block 5-1 is symmetrically distributed in pressurize lower cover 4 length direction both sides.For the ease of work Make personnel movable length pressurize slide block 5-1, it is preferable that the top of length pressurize slide block 5-1 is provided with arc Connected in star, during staff movable length pressurize slide block 5-1, is directly placed on arc by finger Sliding length pressurize slide block 5-1 in groove.

For the ease of staff mobile width pressurize slide block 5-2, it is preferable that width pressurize slide block The top of 5-2 is provided with arc groove, during staff mobile width pressurize slide block 5-2, directly will Finger is placed on slip width pressurize slide block 5-2 in arc groove.In order to make fuselage 1 stress put down Weighing apparatus, it is preferable that width pressurize slide block 5-2 is two, and two width pressurize slide block 5-2 symmetries are divided It is distributed in pressurize lower cover 4 width both sides.

In order to make fuselage 1 stress balance, it is preferable that excessively slide block 5-3 is four, each length An excessive slide block 5-3 it is provided with between pressurize slide block 5-1 and width pressurize slide block 5-2.In order to just Excessive slide block 5-3 is moved, it is preferable that it is recessed that the top of excessive slide block 5-3 is provided with arc in staff Groove is when staff moves excessive slide block 5-3, sliding in finger is directly placed on arc groove Dynamic excessive slide block 5-3.

Further, this locking device also includes eight elastic reset parts, two length pressurize slide blocks 5-1, two width pressurize slide block 5-2 and four excessive slide block 5-3 are provided with an elasticity respectively Return unit, the other end of elastic reset part is fixing with pressurize lower cover 4 to be connected.Concrete, this bullet Property return unit can be corrugated tube, in order to reduce elastic reset part manufacturing cost and extend elasticity The service life of return unit, it is preferable that elastic reset part is spring.By arranging elastic reset part, After pressurize upper cover 6 departs from pressurize lower cover 4, length pressurize slide block 5-1, width pressurize are slided Block 5-2 and excessive slide block 5-3 return under the effect of elastic reset part, it is simple to staff takes Go out pre-tightening apparatus and fuselage 1.

Pressurize upper cover 6 is picked and placeed, it is preferable that pressurize upper cover 6 is provided with handle for the ease of staff Hands 8, stress balance during in order to make pressurize upper cover press for 6 times, it is preferable that handle 8 is two, two Individual handle 8 is symmetrically distributed in the opposite sides of pressurize upper cover 6.Process for the ease of staff Locking device, it is preferable that pressurize upper cover 6 and handle 8 are formed in one structure.

Preferably, pressurize lower cover 4 is provided with four alignment pins, and pressurize upper cover 6 is provided with to be worn for alignment pin The hole, location crossed, four alignment pins lay respectively at four knuckles of pressurize lower cover 4.In order to just Locking device is processed, it is preferable that pressurize lower cover 4 and alignment pin are integral type structure in staff. By arranging alignment pin, it is to avoid staff under press pressurize upper cover 6 time, pre-tightening apparatus position The situation of movement, improves locking device job stability.

In order to improve the stability that slider locking device 5 moves, it is preferable that set on pressurize lower cover 4 There is the limit sliding chutes for housing slider locking device 5.Concrete, two length pressurize slide blocks 5-1, two width pressurize slide block 5-2 and four the excessive each parts of slide block 5-3 all correspondences one Limit sliding chutes.

On the basis of above-mentioned each scheme, it is preferable that pressurize upper cover 6 top is hollow structure, in The strengthening rib strip of interlaced arrangement it is provided with inside hollow structure.The wherein number of strengthening rib strip and shape root Depending on concrete condition according to pressurize upper cover 6, the application is not specifically limited.

Preferably, product Fastener 7 is elasticity arm, and product Fastener 7 is by securing member 3-3 Being arranged on base plate 3, concrete, this securing member 3-3 can be pin.Due to product clamping Part 7 has certain elastic force, it is to avoid product Fastener 7 tension compresses the situation of fuselage 1, enters one Step improves the some glue pressurize quality of fuselage 1.In order to extend the service life of product Fastener 7, Preferably, elasticity arm is rigidity elasticity arm.

It is more highly preferred to, product Fastener 7 and securing member 3-3 matched in clearance.Due to product card Tight part 7 and securing member 3-3 matched in clearance, product Fastener 7 can revolve around securing member 3-3 Turn, so during dismounting fuselage 1, it is not necessary to dismounting product Fastener 7, significantly reduce work Make the labor intensity of personnel.Product Fastener 7 is dismounted, it is preferable that tight for the ease of staff Firmware 3-3 is threaded fastener.

Further, product Fastener 7 is multiple, and multiple product Fasteners 7 are symmetrically distributed in the end Plate 3 opposite sides, it is preferable that two long sides of base plate 3 are respectively distributed three product Fasteners 7.Owing to multiple product Fasteners 7 are symmetrical so that fuselage 1 stress more balances, and enters one Step improves the some glue pressurize quality of fuselage 1.

Fuselage 1 is placed, it is preferable that the upper surface of base plate 3 is provided with base plate for the ease of staff Alignment pin 3-1, concrete, base plate alignment pin 3-1 can be one.In order to accurately to fuselage 1 Location, it is preferable that base plate alignment pin 3-1 is two, and two base plate alignment pin 3-1 are positioned at base plate 3 Relatively at knuckle.

In order to alleviate base plate 3 overall weight, reduce the manufacturing cost of base plate 3 simultaneously, it is preferable that Base plate 3 is provided with lightening hole 3-2, and wherein the quantity of lightening hole 3-2 and size are according to practical situation Depending on, the application is not specifically limited.

On the basis of above-mentioned each scheme, it is preferable that the lower surface of base plate 3 is hollow-core construction, empty The base plate strengthening rib strip of interlaced arrangement, the wherein number of base plate strengthening rib strip it is provided with inside core structure Depending on base plate 3 practical situation, the application is not specifically limited.Following table due to base plate 3 Face is hollow-core construction, and this arranges base plate strengthening rib strip, while proof strength, alleviates Base plate 3 materials, reduce further the manufacturing cost of base plate 3.

The labor intensity of lid Fastener is manufactured, it is preferable that lid clamping in order to reduce staff Part is buckle.Owing to lid Fastener is buckle, staff can directly be commercially available, Avoid the situation that staff is separately fabricated.

Further, the cover plate alignment pin being arranged on cover plate 2 lower surface, its cover plate are also included Alignment pin can be one.By arranging cover plate alignment pin, it is simple to staff is in time by top cover It is placed on predeterminated position, improves the work efficiency of staff.

Preferably, cover plate alignment pin is two, and two cover plate alignment pins are along cover plate 2 length direction Distribution, it is simple to cover plate 2 position is accurately positioned by staff.

Pre-tightening apparatus is processed, it is preferable that cover plate alignment pin with cover plate 2 is for the ease of staff Integrated formed structure.

On the basis of above-mentioned each scheme, it is preferable that cover plate 2 upper surface is hollow-core construction, hollow Inside configuration is provided with the cover plate strengthening rib strip of interlaced arrangement.Its cover plate strengthening rib strip individual several Depending on cover plate 2 practical situation, the application is not specifically limited.Upper surface due to cover plate 2 For hollow-core construction, and cover plate strengthening rib strip is set, while proof strength, decreases pretension Device entirety materials, reduce further the manufacturing cost of pre-tightening apparatus.

Pre-tightening apparatus is processed, it is preferable that cover plate 2 and cover plate strengthening rib strip for the ease of staff Be formed in one structure.

In this specification, each embodiment uses the mode gone forward one by one to describe, and each embodiment emphasis is said Bright is all the difference with other embodiments, and between each embodiment, identical similar portion is mutual See mutually.

Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of Or use this utility model.To the multiple amendment of these embodiments professional technique people to this area Will be apparent from for Yuan, generic principles defined herein can be without departing from this reality In the case of novel spirit or scope, realize in other embodiments.Therefore, this practicality The novel the embodiments shown herein that is not intended to be limited to, and it is to fit to public with institute herein The principle opened and the consistent the widest scope of features of novelty.

Claims

1. a some glue pressurizer, including pre-tightening apparatus and by the locking of pre-tightening apparatus locking Device, described pre-tightening apparatus includes base plate (3) and cover plate (2), it is characterised in that described pre- Tight device also includes being arranged on described base plate (3) side and for clamping fuselage (1) side Product Fastener (7) and be arranged on described cover plate (2) side and for and base plate (3) clamping Lid Fastener, described lid Fastener at least two, described cover plate (2) relative two Individual side is at least distributed a described lid Fastener, and described product Fastener (7) is at least Two, two sides that described base plate (3) is relative are at least distributed a described product Fastener (7)；

Described locking device includes pressurize upper cover (6), pressurize lower cover (4) and is arranged on described Pressurize lower cover (4) is internal, and is used for compressing the slider locking device (5) of fuselage (1) side, The lateral surface of described slider locking device (5) is provided with slide block movement inclined-plane, described pressurize upper cover (6) Inside be provided with and described slide block movement inclined-plane laminating slider guide inclined-plane.

The most according to claim 1 some glue pressurizer, it is characterised in that described cunning The upper surface contacted with fuselage (1) of block locking device (5) is provided with pressurize elastic layer.

The most according to claim 2 some glue pressurizer, it is characterised in that described cunning Block locking device (5) includes the length pressurize extended along described pressurize lower cover (4) length direction Slide block (5-1), width pressurize slide block (5-2) extended along described pressurize lower cover (4) width And be arranged at described pressurize lower cover (4) knuckle, and medial surface can be used in and fuselage (1) The excessive slide block (5-3) that side abuts, the medial surface of described excessive slide block (5-3) is arc, Described length pressurize slide block (5-1), described width pressurize slide block (5-2) and described excessive slide block (5-3) described pressurize elastic layer it is equipped with on.

The most according to claim 3 some glue pressurizer, it is characterised in that described length Degree pressurize slide block (5-1) is two, and two described length pressurize slide block (5-1) are symmetrical In described pressurize lower cover (4) length direction both sides；

Described width pressurize slide block (5-2) is two, two described width pressurize slide block (5-2) It is symmetrically distributed in described pressurize lower cover (4) width both sides；

Described excessive slide block (5-3) is four, each described length pressurize slide block (5-1) and A described excessive slide block (5-3) it is provided with between described width pressurize slide block (5-2).

The most according to claim 1 some glue pressurizer, it is characterised in that described product Product Fastener (7) is elasticity arm, and described product Fastener (7) is pacified by securing member (3-3) It is contained on described base plate (3).

The most according to claim 5 some glue pressurizer, it is characterised in that described tightly Firmware (3-3) is threaded fastener, described product Fastener (7) and described securing member (3-3) Matched in clearance, described product Fastener (7) is multiple, multiple described product Fasteners (7) It is symmetrically distributed in described base plate (3) opposite sides.

The most according to claim 1 some glue pressurizer, it is characterised in that the described end The upper surface of plate (3) is provided with base plate alignment pin (3-1), and described base plate alignment pin (3-1) is Two, two described base plate alignment pins (3-1) are positioned at described base plate (3) knuckle relatively.

The most according to claim 1 some glue pressurizer, it is characterised in that also include Being arranged on the cover plate alignment pin on described cover plate (2) lower surface, described cover plate alignment pin is two, Two described cover plate alignment pins are distributed along described cover plate (2) length direction.

The most according to claim 1 some glue pressurizer, it is characterised in that described guarantor Pressure lid (4) is provided with the limit sliding chutes for housing described slider locking device (5).

10., according to the some glue pressurizer according to any one of claim 1-9, its feature exists In, described pressurize lower cover (4) is provided with four alignment pins, and described pressurize upper cover (6) is provided with confession The hole, location that described alignment pin passes, four described alignment pins lay respectively at described pressurize lower cover (4) Four knuckles at.