CN101997197B

CN101997197B - Connector

Info

Publication number: CN101997197B
Application number: CN201010261193.8A
Authority: CN
Inventors: 酒井央丞; 桥本俊辅; 志田祐一
Original assignee: Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Holdings Corp
Priority date: 2009-08-24
Filing date: 2010-08-23
Publication date: 2014-01-01
Anticipated expiration: 2030-08-23
Also published as: KR20110023767A; CN101997197A; KR101141107B1; TWI429139B; TW201117480A; JP2011044405A

Abstract

The present invention provides a connector, capable of improving locating precision of a conductor relative to a connection position of the connector, and improving reliability of electric connection. A contact (3) connects a support part (31) and a spring part (32) arranged oppositely in a direction of inserting the conductor to form a continuous body by a connection part (33), the support part is abutted to an inner face of a connector main body (2), and one end part of a conductor insertion port (21) of the spring part is held in the connector main body in a freely moving manner. The support part and the spring part have claws (35a, 32a) for holding the conductor (100). The support part is provided with a locating projection (37) abutted to a front end part of the conductor and arranged in a front position relative to the claws in the direction of inserting the conductor. When an operation element (5) is rotated to an anti-falling-off position, a cam part (51) pushes a front position of the spring part relative to the locating projection in the direction of inserting the conductor so as to make the spring part to elastically deform, such that the claw (32a) is contacted with the conductor elastically.

Description

Connector

Technical field

The present invention relates to connect the connector of the such wire of flexible printed circuit board (Flexible Printed Circuits).

Background technology

In the past, as the connector that keeps the such wire of FPC, the connector of record in patent documentation 1 was arranged.This connector has connector body 60, the many contacts 70 that are maintained at respectively on connector body 60 of plug wire 100 as shown in Fig. 7 (a), (b), and rotation freely is maintained at the operating parts 80 that makes many contacts 70 contact or separate with wire 100 on connector body 60, according to rotating operation.

Connector body 60, at the both ends opening of the left and right directions of Fig. 7 (a), inserts wire 100 from the wire insert port 61 in left side.

Each contact 70 is for to be pressed into and to be fixed on the parts connector body 60 from the peristome on connector body 60 right sides, support 71, the spring section 72 of extending with the mutual almost parallel of along continuous straight runs ground and be connected to support 71 and spring section 72 right sides between connecting portion 73 form the コ word shape.Spring section 72 is by cantilever support on connecting portion 73, and the left end of spring section 72 is freedom of movement along the vertical direction in the inside of connector body 60, is provided with the contact section 74 be electrically connected to wire 100 in the left part of spring section 72.Support 71 is along the bottom wall upper surface configuration of connector body 60, and the position relative with contact section 74 in the left part of support 71 is provided with receiving portion 75.In addition, many contacts 70 are remained on connector body 60 side by side along the direction vertical with the drawing of Fig. 7 (a).

Operating parts 80 rotates and freely is bearing on connector body 60 by axle with respect to connector body 60, spring section 72 and be arranged on the opposed position of abutting part 76 between contact section 74 and connecting portion 73, is provided with cam part 81.

As shown in Fig. 7 (a), when making operating parts 80 turn on the upright position of operating parts 80, while with operating parts 80, turning to the position with the horizontal direction almost parallel, compare, because the lower end position of cam part 81 moves up, therefore spring section 72 is to the direction strain of leaving support 71, so contact section 74 is displaced to the position of leaving from wire 100.

And, when being displaced to the locational state left from wire 100 in 70 contact, contact section 74 while from wire insert port 61, wire 100 being inserted into to the inside of connector body 60, because the leading section of wire 100 and the location division 62 of connector body 60 interior settings connect, therefore determined the insertion position of wire 100.Then, while making operating parts 80 turn to the position with the horizontal direction almost parallel under the state be inserted at wire 100, utilize cam part 81 that abutting part 76 is pressed to support 71 1 sides, spring section 72 is to support 71 1 side strains.Now, wire 100 is clamped between the contact section 74 and receiving portion 75 of spring section 72 top ends settings, and contact section 74 is electrically connected to the wire 100 upper conductor figs that arrange in surface (not expression in figure).

No. 4283777 communique of [patent documentation 1] Japan special permission

In the connector of above-mentioned prior art, when wire 100 is inserted into connector body 60 inside, the location division 62 of the leading section of wire 100 and connector body 60 connects, by determining like this position of the leading section of wire 100 with respect to connector body 60, but because being pressed into, contact 70 is fixed in connector body 60, if the precision that therefore contact 70 is assembled in connector body 60 is low, the large such problem of the position deviation that exists contact 70 to contact with wire 100.

In recent years along with the miniaturization of electronic equipment, wish also miniaturization of connector, occurred that the direction (left and right directions in Fig. 7) that insert towards wire the position by making contact section 74 between adjacent contact 70 staggers, the connector that the spacing between adjacent contact 70 is narrowed down.Fig. 6 is the vertical view that is connected to the wire 100 on this connector, on a surface of wire 100, broad ways disposes a plurality of conductor figs 101 abreast side by side, but in order to make to be electrically connected to firmly, conductor fig 101 with greater than other parts connector contact, form to such an extent that width is wide, by make this position on the wire direction of insertion, broad position 102 stagger ground interconnected, not only can make the width dimensions of wire 100 reduce, and increase number of poles.On the other hand, in the situation that between the adjacent contact 70 of connector, staggered along the wire direction of insertion in the position of contact section 74, need to exactly 70 contact, each contact section 74 be aligned with the relative position at the broad position 102 of conductor fig 101, if but contact 70 positional precision relative with connector body 60 is poor, the contact condition of the broad position 102Yu contact section 74 of conductor fig 101 becomes unstable, has the problem of the reliability reduction be electrically connected to.Especially because short than the broad position 102 of rear side of the length dimension at the broad position 102 of wire direction of insertion front side, the higher positional precision of contact 70 requirement therefore contact with the broad position 102 of wire direction of insertion front side.

Summary of the invention

The present invention is exactly in view of the above problems, its objective is to provide a kind of improved wire with respect to the positioning precision of connector link position, improved the connector of reliability of electrical connection.

In order to achieve the above object, the present invention is a kind of connector, possesses: connector body, the wire insert port of offering by surface and insert or extract wire in the contact receiving space that inside arranges; A plurality of contacts, have along the wire direction of insertion and relatively be configured in support and the spring section that the contact receiving space is inner, clamping is inserted into wire between the two, and support and spring section are connected into to a connecting portion of integral body continuously, this contact the inner face of support and connector body is connected and make spring section wire insert port one side the end freedom of movement be maintained in connector body, at least one party in spring section or support is electrically connected to the conductor part of wire; And operating parts, can make to be inserted into wire in the receiving space of contact is difficult to the anticreep position of extracting relatively and the non-anticreep position of relatively easily extracting between be configured in freely to rotate on connector body; Be respectively arranged with the clamping part that clamping is inserted into the wire between support and spring section in the support of each contact and spring section; And be provided with the location division that is positioned at than clamping part on position on the front, connects with the leading section of wire on the support of contact on the wire direction of insertion; Be provided with a plurality of cam part on operating parts, the plurality of cam part and spring section on the wire direction of insertion, with respect to location division, position on the front arranges accordingly, push spring section and make spring section strain when rotating to the anticreep position, by clamping part and the wire Elastic Contact that makes like this spring section.

The effect of invention

If employing the present invention, when from the wire insert port, inserting wire, the location division arranged on leading section by making wire and the support of contact connects, owing to can determining exactly the relative position of wire with respect to contact, therefore the deviation of the position that the clamping part of support and spring section contacts with wire can be reduced, the reliability of electrical connection can be improved.

The accompanying drawing explanation

Fig. 1, for the figure of the connector of this example of expression, (a) is the figure of the cross section A-A of Fig. 3; (b) be the figure of the section C-C of Fig. 4;

Fig. 2, for the figure of the connector of this example of expression, (a) is the figure of the section B-B of Fig. 3; (b) be the figure of the section D-D of Fig. 4;

Fig. 3 is for the figure of the connector of this example of expression, (a)～(c) for to make operating parts rotate to the three-view diagram of the state of non-anticreep position;

Fig. 4 is for the figure of the connector of this example of expression, (a)～(c) for to make operating parts rotate to the three-view diagram of the state of anticreep position;

Fig. 5 is for the figure of the connector of this example of expression, (a) for to make operating parts rotate to the outward appearance perspective view of the state of non-anticreep position; (b) for to make operating parts rotate to the outward appearance perspective view of the state of anticreep position;

Fig. 6 is the vertical view that is connected to the wire on the connector of this example;

Fig. 7 is for the figure of the connector of expression prior art, (a) for to make operating parts rotate to the cutaway view of the state of non-anticreep position; (b) for to make operating parts rotate to the cutaway view of the state of anticreep position.

Description of reference numerals

1. connector; 2. connector body; 3,4. contact; 5. operating parts; 20. contact receiving space; 21. wire insert port; 31,41. supports; 32,42. spring sections; 32a, 35a, 41a, 42a. pawl (clamping part); 33,43. connecting portions; 35. bullet contact pin; 36,46. depressed parts; 37. positioning convex (location division); 51,52. cam part; 100. wire; 101. conductor fig (conductor portion);

Embodiment

Below with reference to Fig. 1～Fig. 6 explanation, technological thought of the present invention is applied to connect the example on the connector of the such wire of flexible printed circuit board (Flexible Printed Circuits).In addition, in the following description, as long as no special explanation in advance, the direction dictates direction up and down shown in Fig. 3 (a), describe the left and right directions in Fig. 3 (c) as fore-and-aft direction.Wherein, the left side of Fig. 3 (c) is as the front side of wire direction of insertion.

The connector 1 of this example is 7 electrode type connectors, possess connector body 2, two kind of

contact

3 and 4 and operating parts 5 as primary structure.In addition, the number of electrodes of connector 1 is not limited to above-mentioned number of electrodes, can manufacture the number of electrodes connector corresponding with specification.

Connector body 2 use for example have products formed or other suitable materials of the synthetic resin of insulating properties and make, offer on a face of fore-and-aft direction (wire direction of insertion) inner contact receiving space 20 and the outside wire insert port 21 be communicated with, and be provided with the peristome 22 from the another side of fore-and-aft direction to the part of upper wall.And contact receiving space 20 is separated predetermined spacing setting next door 23 along left and right directions is separated into a plurality of reception rooms, contain some in

contact

3,4 in each reception room.

The metal material of the elasticity such as 2 kinds of

contact

3,4 use such as copper beryllium alloys and good conductivity forms, interconnected along the left and right directions of connector body 2.Wherein, a contact 3 is configured in starting (1,3,5,7) position of odd number from left and right directions one end of connector body 2, and another contact 4 is configured in starting (2,4,6) position of even number from left and right directions one end of connector body 2.

As shown in Fig. 1 (a), (b), the contact 3 of odd number lead-in wire has along wire direction of insertion (fore-and-aft direction) and relatively is configured in the inside of contact receiving space 20, support 31 and the spring section 32 that wire 100 is between the two inserted in clamping, and the connecting portion 33 that front end one side on the wire direction of insertion of support 31 and spring section 32 is connected into to continuous integral body.Contact 3 forms the U word shape by support 31, spring section 32 and connecting portion 33, and the connecting portion 33 of usining inserts in each reception room from wire insert port 21 as head.

In being configured to contact receiving space 20 under the state that the support 31 of contact 3 connects at the inner face that makes lower edge and connector body 2 (upper surface of lower wall).Terminal plate 34 on the conductor fig that the installation base plate that is provided with the notch 2a that arranges from the lower wall of connector body 2 and does not have to downward-extension, in being soldered to figure to mean in the end of wire insert port 21 1 sides of support 31 arranges.And, from the middle part of support 31, start to be provided with the bullet contact pin 35 that guiding line insert port 21 1 is side-prominent, top ends is relative with the top ends of spring section 32, be equipped with the pawl 35a towards spring section 32 1 sides on the top ends of this bullet contact pin 35.And, be formed with the guiding groove 24 of the upper and lower surface of the wire 100 open towards wire insert port 21 1 sides, that guiding is inserted from wire insert port 21 on next door 23 along the wire direction of insertion,, be equipped with the front end of wire 100 and connect as the positioning convex 37 of location division by the position of wire insert port 21 1 sides in the front position of the ratio guiding groove 24 of support 31.

The position of exposing from peristome 22 in the spring section 32 of contact 3, be provided with depressed part 36, the cam part 51 of aftermentioned operating parts 5 is inserted in this depressed part 36.And, in spring section 32, by wire insert port 21 1 sides, along the vertical direction on the top ends, the position relative with the pawl 35a that plays contact pin 35 tops of freedom of movement, towards bullet contact pin 35 1 pleurapophysis, be provided with pawl 32a.Here form with the pawl 35a of support 31 1 sides and the pawl 32a of spring section 32 1 sides the clamping part that the wire 100 between support 31 and spring section 32 is inserted in clamping.

And the contact 4 of even number lead-in wire is as shown in Fig. 2 (a), (b), there is the support 41 and the spring section 42 that relatively are configured in receiving space 20 inside in contact along wire direction of insertion (fore-and-aft direction), and the connecting portion 43 that the middle part of the wire direction of insertion of support 41 and spring section 42 (front side than the front position of guiding groove 24 by the wire direction of insertion) is connected into to continuous integral body.These contact 4 use supports 41, spring section 42 and connecting portion 43 form the H word shape, from peristome 22 1 sides, are inserted in each reception room.

Under the state that the support 41 of contact 4 connects at the inner face that makes lower edge and connector body 2 (upper surface of lower wall), be configured in contact receiving space 20.In the end of peristome 22 1 sides of support 41, be provided with the notch 2b that arranges from the lower wall of connector body 2 to downward-extension, be soldered to the terminal plate 44 on the conductor fig of installation base plate (not having in figure to mean) setting.And, on the top ends of wire insert port 21 1 sides of support 41, towards spring section 42 1 pleurapophysis, be provided with pawl 41a.

In the spring section 42 of contact 4, be equipped with towards the pawl 42a of support 41 1 sides from the top ends of wire insert port 21 1 sides, with the pawl 41a of support 41 1 sides and the pawl 42a of spring section 42 1 sides, form the clamping part that the wire 100 between support 41 and spring section 42 is inserted in clamping.And, be bearing in position on connecting portion 43 by below the position of the contrary side of wire insert port 21 at the ratio of spring section 42, be formed with the semi-cylindrical canyon section 46 of the cam part 52 of inlaying aftermentioned operating parts 5.

Operating parts 5 use insulating properties synthetic resin form the long plate shape that left and right directions is elongated, the

cam part

51,52 that the end of Width (above-below direction in Fig. 4 (b)) of can take arranges is pivot, between the anticreep position that wire 100 is difficult to relatively extract and non-anticreep position that wire 100 is relatively easily extracted, is maintained at freely to rotate on connector body 2.

Cam part 51 arranges accordingly with the depressed part 36 of contact 3, and cross sectional shape forms rectangle.Distance from the lower wall of connector body 2 to cam part 51 lower end positions changes with the rotary manipulation of operating parts 5, as shown in Fig. 1 (b), distance from the lower wall of connector body 2 to cam part 51 lower end positions under the state that operating parts 5 is fallen down (anticreep position) is minimum, as Fig. 1 (a) be shown in, operating parts 5 is erected under the state (non-anticreep position) that comes to the distance maximum from the lower wall of connector body 2 to cam part 51 lower end positions.

And cam part 52 is formed the approximately cylindrical shape of 3/4ths circumference, the axis direction of column part is arranged side by side along left and right directions, under the state connected at the depressed part 46 of the side face of column part and contact 4, configure.Wherein, the connecting hole 53 that the end that be formed with depressed part 46 one sides that supply spring section 42 adjacent with cam part 52 engages on operating parts 5.Distance from the lower wall of connector body 2 to cam part 52 upper end positions corresponding operating parts 5 rotating operation and change, as Fig. 2 (b) is shown under the state (anticreep position) that operating parts 5 is fallen down, the distance from the lower wall of connector body 2 to cam part 52 upper end positions be maximum; As Fig. 2 (a) be shown in, operating parts 5 is erected under the state (non-anticreep position) that comes, the distance from the lower wall of connector body 2 to cam part 52 upper end positions be minimum.

The following describes the action while on the connector 1 of this example, plugging wire 100.As shown in Fig. 1 (a), Fig. 2 (a) and Fig. 3, before connecting wire 100 in the position that operating parts 5 is upright (with the position of support 31,41 nearly orthogonals of contact 3,4), in this state, because cam part 51 as shown in Fig. 1 (a) does not push the depressed part 36 of contact 3 downwards, therefore spring section 32 does not produce strain, and the pawl 32a of spring section 32 is to direction (upside) displacement of leaving the pawl 35a that plays contact pin 35.And as shown in Fig. 2 (a), in this state due to cam part 52 upwards thruster press the depressed part 46 of contact 4, therefore spring section 42 does not produce strain, and the pawl 42a of spring section 42 is to direction (upside) displacement of the pawl 41a that leaves support 41.Therefore, at operating parts 5, rotate under the state of the non-anticreep position shown in Fig. 1 (a) and Fig. 2 (a), pawl 32a, the 42a of

spring section

32,42 is displaced to the position do not contacted with wire 100, therefore the soft wire 100 of FPC and so on can make wire 100 is inserted in connectors 1 to the resistance force diminishes while connecting, even also can easily insert in connector 1 and be connected.In addition, operating parts 5 is rotated under the state of non-anticreep position, pawl 32a, the 42a of

contact

3,4 also can be configured on the position contacted with wire 100, now when inserting wire 100, establish and be electrically connected to, but compare the state of confining force in less that

contact

3,4 keeps wire 100 while with operating parts 5, being positioned at the anticreep position, so the state of wire 100 in relatively easily extracting.

Operating parts 5 is rotated under the state of non-anticreep position, if from wire insert port 21, wire 100 is inserted into to the inside of connector body 2, under guiding groove 24 guiding that wire 100 arranges on by next door 23 at upper and lower surface, be inserted between the support 31,41 and

spring section

32,42 of contact 3,4.As shown in Fig. 1 (b), when wire 100 further is inserted into connector body 2 inside, the leading section of wire 100 is connected on the positioning convex 37 of contact 3, by determining like this position of the leading section of wire 100 with respect to contact 3,4.

Under the state of the inside that wire 100 is inserted into to connector body 2, if picture makes shown in Fig. 1 (b), Fig. 2 (b) and Fig. 4 operating parts 5 rotate to the position with support 31,41 almost parallels of

contact

3,4, as shown in Fig. 1 (b), cam part 51 pushes the depressed part 36 of contact 3 downwards, make spring section 32 strains, pawl 32a by making like this spring section 32 is to playing contact pin 35 1 sides (downside) displacement, conductor fig 101 (conductor part) Elastic Contact that the pawl 32a of spring section 32 and wire 100 arrange above.And now as shown in Fig. 2 (b), the depressed part 46 that cam part 52 upwards pushes contact 4 makes spring section 42 strains, take connecting portion 43 41 1 side displacements as fulcrum to support by the pawl 42a that makes like this spring section 42, the conductor fig arranged above 101 Elastic Contact of the pawl 42a of spring section 42 and wire 100.Therefore, at operating parts 5, rotate under the state of the anticreep position shown in Fig. 1 (b), Fig. 2 (b) and Fig. 4, because pawl 32a, the 42a of

spring section

32,42 is urged respectively on wire 100, therefore become the state that wire 100 is kept by the crimping of

contact

3,4, become wire 100 and relatively be difficult to the state of extracting.And, pawl 32a by wire 100 being clamped in to spring section 32 and playing between the pawl 35a of contact pin 35, and wire 100 is clamped between the pawl 41a of the pawl 42a of spring section 42 and support 41, makes to become the state be electrically connected between the conductor fig 101 of

contact

3,4 and wire 100.

On the other hand, under the state be connected with connector 1 at wire 100, if make operating parts 5 rotate to non-anticreep position from the anticreep position, the power of the depressed part 36,46 of

cam part

51,52 extruding

contacts

3,4 disappears, made pawl 32a, the 42a displacement upward of

spring section

32,42 by the elastic restoring force of

spring section

32,42, leave wire 100, so the power disappearance of

contact

3,4 maintenance wires 100, can easily extract wire 100.

The connector 1 of this example adopts structure as described above, when from wire insert port 21, inserting wire 100, the positioning convex (location division) 37 arranged on the support 31 of the leading section of wire 100 and contact 3 connects, by determining so exactly the position of wire 100 with respect to contact 3,4, therefore can reduce the deviation of clamping part and wire 100 contact positions of support 31,41 and

spring section

32,42,

contact

3,4 electrically contacts at preposition and wire 100, can improve the reliability of electrical connection.

And, in this example due to respectively with the

spring section

32,42 of

multipole contact

3,4

cam part

51,52 of setting operation part 5 accordingly, the spring section 32 of the contact 3 of odd number lead-in wire upwards thruster presses cam part 51, cam part 52 is pressed in the downward thruster of spring section 42 of the contact 4 of even number lead-in wire, therefore even do not arrange the bearing arrangement of operating parts 5 pivot suspensions on connector body 2, also can=rotate and freely make operating parts 5 pivot suspensions on the

contact

3,4 be held on connector body 2.

Although be provided with in the middle part of the support 31 of each contact 3 positioning convex 37 that carries out wire 100 location in above-mentioned example, but preferably at support 31, position that can not apply because of the strain of contact 3 active force while under the state of insertion wire 100, operating parts 5 being swung to the anticreep position from non-anticreep position, positioning convex 37 is set, can suppresses to impose on the power of wire 100 and make the position of wire 100 produce skew from positioning convex 37.In addition, if can obtain the contact of predetermined value above contact 3 and wire 100, the position that suppresses wire 100 due to the enough contacts of energy is offset, therefore the positioning precision at wire 100 meets in the scope of predetermined performance requirement, by the strain of contact 3, applies active force to the position that is provided with positioning convex 37 also passable.

And, although only on contact 3, be provided with positioning convex 37 in this example, but because the broad position 102 of the conductor fig 101 of another contact 4 contacts as shown in Figure 6 is positioned at the rear side of wire direction of insertion, the length ruler modest ability on the wire direction of insertion is compared at the broad position 102 contacted with contact 3, therefore even the position of contact 3 and contact 4 assemblings deviation a little on the wire direction of insertion, also can make contact 4 firmly contact with the broad position 102 of conductor fig 101.In addition, while under inserting the state of wire 100, operating parts 5 being swung to the anticreep position from non-anticreep position, if the active force that does not have contact 4 strains to apply, can be in contact the location division that connects of the leading section of 4 one side settings and wire 100.

And, the fabric switch of the contact 4 that also contact 3 of odd number lead-in wire and even number can be gone between.

And, although the clamping part (pawl 32a, 42a) arranged in the conductor fig 101 that makes wire 100 arrange above in this example and

spring section

32,42 electrically contacts, can be also that support 31,41 1 the sides clamping part (playing the pawl 35a of contact pin 35 and the pawl 41a of support 41) arranged and the conductor fig that wire 100 arranges below electrically contact.

Although above, centered by the specific embodiment of the present invention, be illustrated, but can in aim of the present invention and additional claim scope, carry out various distortion, change or correction in the art, therefore above-mentioned explanation and accompanying drawing do not limit technological thought of the present invention, and can only be interpreted as is example of the present invention.

Claims

1. a connector is characterized in that possessing: connector body, the wire insert port of offering by surface and insert or extract wire in the contact receiving space that arranges in inside;

A plurality of contacts, have along the wire direction of insertion and relatively be configured in support and the spring section that the contact receiving space is inner, clamping is inserted into wire between the two, and support and spring section are connected into to a connecting portion of integral body continuously, this contact the upper surface of the lower wall of the lower edge of support and connector body is connected and make spring section wire insert port one side the end freedom of movement be maintained in connector body, at least one party in spring section or support is electrically connected to the conductor part of wire; And

Operating parts, can make to be inserted into wire in the receiving space of contact is difficult to the anticreep position of extracting relatively and the non-anticreep position of relatively easily extracting between be configured in freely to rotate on connector body;

Be respectively arranged with the clamping part that clamping is inserted into the wire between support and spring section in the support of each contact and spring section; And be provided with the location division that is positioned at than clamping part on position on the front, connects with the leading section of wire on the support of contact on the wire direction of insertion;

Be provided with a plurality of cam part on operating parts, the plurality of cam part and spring section on the wire direction of insertion, with respect to location division, position on the front arranges accordingly, push spring section and make spring section strain when rotating to the anticreep position, by clamping part and the wire Elastic Contact that makes like this spring section.

2. connector as claimed in claim 1, it is characterized in that, the aforesaid operations part and the above-mentioned a plurality of cam part corresponding setting of above-mentioned a plurality of spring section push alternately above-mentioned a plurality of spring section downwards and upwards when making the aforesaid operations part rotate to the anticreep position, make this spring section strain.