CN101895048B

CN101895048B - Installing and removing tool for connecting F male coaxial cable connector

Info

Publication number: CN101895048B
Application number: CN2009103024308A
Authority: CN
Inventors: 尤希·提摩西L
Original assignee: PHOENIX TECHNOLOGY GROUP Co Ltd
Current assignee: PHOENIX TECHNOLOGY GROUP Co Ltd; Phoenix Communications Tech International
Priority date: 2009-05-19
Filing date: 2009-05-19
Publication date: 2012-11-21
Anticipated expiration: 2029-05-19
Also published as: CN101895048A

Abstract

An installing and removing tool for connecting an F male coaxial cable connector comprises a first socket wrench, a second socket wrench and a connecting piece, wherein the connecting piece connects the first socket wrench and the second socket wrench at the first end and the second end of the connecting piece in a rotatable manner; the first socket wrench and the second socket wrench are respectively provided with a wrench part and a ring-shaped end; the internal surface of the wrench part of the first socket wrench is a hexagonal forming part and is matched with the external surface of a nut of the male connector, thus loosening and locking the nut; the internal surface of the wrench part of the second socket wrench is a constant torque forming part and is matched with the external surface of the nut of the male connector, thus avoiding the tool from applying excessive torque to the nut during installation; the first socket wrench and the second socket wrench are respectively provided with a groove extending from the wrench part to the ring-shaped end. The tool is especially suitable for bent cables or dense cables and connects/separates the male connectors with/from the female connectors.

Description

Connect the F male coaxial-cable connector with installing and removing tool

Technical field:

The present invention relates to a kind of in order to the F public connector is bonded to the instrument of F female connectors.

Background technology:

Most RF coaxial cable (RF coaxial cable) is by the cable TV decoder (Cable TV decoders) of F type rotating connectors (Screw-on F-Typeconnectors) with TV; The digital hdd recorder of cassette tape video tape recorder/DVD (VCR/DVD) (hard disk digital recorders); Satellite receiver (satellitereceivers); Video signal recreation (video games); Distributed separator of TV signal (TV signal distributionsplitters) and switch (switches) connect.With regard to big regional extent connects the TV and cable box (Cable box), cassette tape video tape recorder or video signal recreation that is provided with; The early stage manual mode that adopts is connected in F type cable (each end in RG-6 or RG-59 type coaxial cable has the F public connector) between this television equipment and the cable simply; Because the rear side at this television equipment has bigger space, so just can make to have bigger bending radius at the rear side of this television equipment or the cable that is respectively connected between the device.The minimum bending radius that for example, must be had by manufacturer's defined RG-6 cable is 3 inch.

Yet; Because present television equipment is co-located on a narrow space or the master station (console) with several modes mostly; The operator must be earlier can install television equipment and remove after limited space or master station remove for F type cable, so will cause suitable inconvenience.(screen TV sets) is example with large-screen TV group, for this screen television group be close to as far as possible its adjacent wall, then F type cable must be taked sharp turn (sharp bend) just mode can successfully be bonded to television equipment.Yet any those skilled in the art is all clear to be known, when on semirigid F type coaxial cable and the highdensity cable of tool, adopting the sharp turn mode, no matter to the installation of F type connector, remove, fixing or unclamp all can bringing inconvenience property and expend man-hour.Therefore, the object of the invention is directed against the inconvenience of above-mentioned known technology and proposes improvement.

The standard type design of F type connector adopts the hexagonal (hexagon)nut (hex nut) of 7/16 inch as revolution connecting ring (connecting ring); Wherein, Length circle of this nut in 1/8 to 1/4 inch; This dimensions length quite is appropriate to the control pointed, and the internal thread of nut and the F female connectors that cooperated thereof is per 3/8 inch, 32 teeth.When both are coupled, must under suitable accurate the aligning, can reach between F public connector and this F female connectors and combine.If carry out under the effect of local straightening for the external screw thread face cable in line with this F female connectors with the mode of extending back, then this F public connector just can align on a certain plane with between this F female connectors.Yet; If when this cable is approached this F public connector with bend mode; Because base connector is adjacent to the surface of a wall or a cupboard behind the F type of this television equipment; Then this moment, the operator must carry out the straightening processing partly with this cable, so can enough the F public connector be bonded on the F female connectors.

Can know that compared to known technology this F public connector adopts the conventional manual rotation mode to lock in this F female connectors or this F female connectors separates certainly.When with manual mode (being generally 4 circles) the F public connector being screwed in fully behind the F female connectors, can reverse this hexagonal (hexagon)nut this moment by spanner, can guarantee that so just this connector is unlikely to generation and unclamps.Can reach definite electric connection and basic usefulness thereof in order to ensure this F type connector, it is to be the industrial standard value to surpass the torque value that single finger can reach that manufacturer stipulates out the torque value that puts on this F type connector.In present embodiment, the connector of this cable TV product adds in addition that after accomplishing manually rotation the rotation of 90-120 degree measures again.With regard to the more weak consumer products of female joint structure (female mountingstructures) (referring generally to plastics), the strength of screwing that is applied to the F type connector of this series products only needs slightly to surpass the torque value that finger can reach and get final product.If when cable is in case of bending, the operator then must adopt bigger strength to accomplish the installation of F public connector or remove, and its mode can be accomplished by the torsion that an instrument is provided.

Carry out screwing of this F type connector and unclamp in adopting two kinds of instruments and method at present.First kind of instrument is a selenodont spanner (crescent wrench), and wherein, this spanner has 7/16 o'clock standard openings (open-end), and the minimum axial length that this selenodont spanner is had is the 4-6 inch.Because the mode of operation of this selenodont spanner for radially to turn round along the axle center of this F type connector, therefore when being rotated for the male and female connector that is mutually locked, cannot have the existence of bar in the turning circle of this selenodont spanner.Yet when carrying out being provided with of this connector for the television equipment with count connector, the cable of the bending that is connected can influence the operation of spanner.

Second kind of instrument is the sleeve driver (driver socket) with 7/16 inch hexagonal (hexagon)nut.Have a groove (slot) on the side of sleeve driver, its mode of operation be by with this groove slippage in one cable has been installed mode can be provided with for F type cable.The shortcoming of this sleeve driver be between the male and female connector that must and be mutually locked of handled cable in line.Hence one can see that; Above-mentioned instrument is subject to the characteristic of itself and can't be applicable to the operating environment of cable close quarters, and how by proper tools with for the installation of the public connector under the high operating environment of cable density or to remove be current important problem.

Zamanzadeh is at United States Patent (USP) the 5th; 992; Expose a kind of coaxial cable connector in No. 010 with instrument (coaxialcable connector tool), this coaxial cable connector comprises a hollow elongated housing (housing) with instrument, wherein; This housing is made up of two half modules (halves) that interlink, and the two-half die that is closure state is round a coaxial cable female connectors.When two-half die is closure state; Be formed with a hexagon ring (hexagonal hole) on the relative both ends of this housing respectively; Hexagonal jacket on this connector (hexagonal sleeve) snug fit is in this hexagon ring, and this cable can reach the location by this hexagon ring.Subsequently, rotate this housing and make this sleeve produce revolution by manual mode.In fact, the size of this housing is greater than the sleeve on this connector, and the hexangle type outer surface on this housing is easy to the control and the rotation of hand.In second embodiment, this housing is in order to as building assembly (built-in component) in the novel connector.

Hence one can see that; Reversing for the connector on the F type cable after bending when unclamping; Its required torque value is five times more than of non-crooked F type cable, and owing to can't this connector be unclamped via the rotation of finger, the operator must be undertaken by the device of tool mechanical advantage.Though; Existing problem can be accomplished the setting of this connector by specific instrument in the known technology; But general mode still earlier with TV or similarly device move away from this master station or will be away from wall; So, again this TV is moved back to both allocations subsequently so that carrying out the straightening of this cable handles, manually this connector is set.

With regard to the interconnector (interconnections) in the present TV Related product; Since interconnector adopt the small size mode (for example: family main dispensing case (home master distribution boxes)) be arranged at the rear side of TV/cassette tape video tape recorder of home entertainment master station (homeentertainment consoles) with shelf, by the composition surface crooked most coaxial cable just can under the mode of full blast, be bonded on the television equipment.Therefore, in the place of the confined space, to have the cable knee comparatively near F type connector installation or remove then under the assistance of the torsion that must be produced by an instrument and can reach.

Summary of the invention:

Technical problem to be solved by this invention is: to the deficiency of above-mentioned prior art; Propose a kind of connection F male coaxial-cable connector with installing and removing tool, can the F public connector with coaxial cable be bonded to the F female connectors of a certain device by this instrument.

In order to solve the problems of the technologies described above; The technical scheme that the present invention adopted is: a kind of connection F male coaxial-cable connector is with installing and removing tool, and in order to a F public connector is mounted to a F female connectors, this F public connector has a nut, a sleeve combination and a coaxial cable; This nut is can the revolution mode to be arranged at the front end of this F public connector; This coaxial cable extends along the tail end rear side of this F public connector, and this nut has the inner surface of screw thread and through the hexagonal outer surface of moulding, it is characterized in that: said instrument comprises: a connection piece; Have a connection piece body, this connector body is provided with one first end and one second end; One first box spanner is linked to first end of this connector, and this first box spanner has a spanner portion and an annular end; This spanner portion is a tube element; And have a front end, a tail end and a hollow body portion; This body is between this front end and this tail end; This body has a groove and extends to tail end by this front end, and the inner surface of this body is provided with between the outer surface of a hexagonal forming part and this nut and cooperates; This annular end is a hollow assembly, comprises the front end and an end of a ring-type, and the front end of this annular end is attached at the tail end of this spanner portion, has the groove that a groove leads to this spanner portion between the front end of this annular end and end; One second box spanner is linked to second end of this connector, and this second box spanner has a spanner portion and an annular end; This spanner portion is a tube element; Have a front end, a tail end and a hollow body portion; This body is between this front end and this tail end, and this body has a groove and extends to tail end by this front end, and the inner surface of this body is provided with between the outer surface of certain torsion forming part and this nut and cooperates; When the sealed torque value of second box spanner surpasses, force this to decide the torsion forming part and separate with nut; This annular end is a hollow assembly, comprises the front end and an end of a ring-type, and the front end of this annular end is attached at the tail end of this spanner portion, has the groove that a groove leads to this spanner portion between the front end of this annular end and end.

So, by pointing this more firm instrument of turn mode, the watt of this instrument with under can public connector positively be incorporated into female connectors; Have out and the box spanner of locking or this instrument by selecting to use simultaneously, have the box spanner of deciding the torsion function and can avoid this instrument when installing, to apply the outer surface of excessive torque value in the nut of public connector with box spanner of deciding torsion.This instrument is applicable to the situation when coaxial cable is crooked or intensive, can the F public connector be arranged at F female connectors (or from this F female connectors separate the F public connector) by this instrument.

For letting above-mentioned purpose of the present invention, characteristic and the advantage can be more obviously understandable, hereinafter is special lifts a preferred embodiment, and cooperates appended graphicly, elaborates as follows.

Description of drawings:

Fig. 1 is the stereogram of known F coaxial cable connector, shows that a coaxial cable is combined with a F public connector.

Fig. 2 is the stereogram of installation of the present invention and removing tool.

Fig. 3 is the three-dimensional exploded view of installation of the present invention and removing tool.

Fig. 4 is the stereogram of the present invention's first box spanner.

Fig. 5 is the stereogram of the present invention's second box spanner.

Fig. 6 is combined with the end view of a nut for the present invention's second box spanner.

Fig. 7 is installation of the present invention and removing tool stereogram in use.

Fig. 8 is installation of the present invention and the stereogram of removing tool when folding.

Fig. 9 is combined with the stereogram of a F public connector to prepare to install for the present invention's first box spanner.

Figure 10 is combined with the stereogram of a F public connector to prepare to install for the present invention's second box spanner.

Figure 11 representes to have the stereogram of the electronic device of several F female connectors; First box spanner is attached on the electronic device, can the F public connector be mounted to the F female connectors (or F public connector removed from the F of electronic device female connectors) of electronic device by first box spanner.

Figure 12 representes to have the stereogram of the electronic device of several F female connectors; Second box spanner is attached on the electronic device, can the F public connector be mounted to the F female connectors (or F public connector removed from the F of electronic device female connectors) of electronic device by second box spanner.

Label declaration:

Coaxial cable 10 public connectors 11

Nut 12 inner surfaces 13

Outer surface 14 sleeve combination 15

Cable 16

Install and removing tool 20 connectors 21

Connector body 22 first ends 23

Second end, 24 first box spanners 30

Second box spanner, 40

spanner portions

31,41

Annular end

32,42

grooves

33,43

Front end

34,44 tail ends 35,45

Body

36,46 hexagonal forming part 37

Receptacle

38,48 first scalariform

push stopping part

39,49

The second scalariform push stopping part, 311,411 front ends 321,421

Terminal 322,422 link slots 323,423

Decide torsion forming part 47 shell fragments 471

Axial groove 472 radial grooves 473

Fin 474 fulcrums 50

Move close to somebody's ear 51 electronic devices 60

F

public connector

11a, 11b, 11c, 11d

Embodiment:

Fig. 1 representes the stereogram of present F male coaxial-cable connector 10.Connector 10 has a F public connector 11 and a coaxial cable 16.Public connector 11 has a sleeve combination 15 and a nut 12, and this nut 12 is can the revolution mode to be arranged at the front end of sleeve combination 15.The inner surface 13 of nut 12 is a screw thread, and the outer surface 14 of nut 12 is that a hexagon can allow to rotate sealed like the instrument (not shown) of hexagonal open-end wrench for nut 12.Cable 16 shown in Figure 1 is flat and extends along the rear end of public connector 11.In general installation process, the part of this cable 16 after bending so will cause sizable inconvenience for known spanner comparatively near public connector 11 in operation.

See also Fig. 2 and shown in Figure 3, the present invention connects the F male coaxial-cable connector and comprises the microscler connector of a sheet 21, one first box spanner 30 and one second box spanner 40 with installation and removing tool 20.Connector 21 comprises a connection piece body 22, and this connector body 22 has first end 23 and second end 24.First,

second box spanner

30,40 forms a tube element by

spanner portion

31,41 and

annular end

32,42 respectively jointly; First,

second box spanner

30,40 has a

groove

33,43 respectively and is formed on the wall of

spanner portion

31,41 and

annular end

32,42, and the geometric direction of

groove

33,43 is consistent with the axis direction of

spanner portion

31,41 and annular end 32,42.In fact,

spanner portion

31,41 has a

front end

34,44, a

tail end

35,45 and a

hollow body portion

36,46 respectively, and

body

36,46 is at

front end

34,44 and tail end 35, between 45.

As shown in Figure 4; The inner surface of the body 36 of first box spanner 30 has a hexagonal forming part (shapedportion) 37 can be in order to the outer surface 14 of the nut 12 of admitting F public connector 11, and a receptacle 38 can be in order to admit the sleeve combination 15 of F public connector 11.This first box spanner 30 has the function of unclamping and locking.

As shown in Figure 5, the body 46 of second box spanner 40 has certain torsion forming part 47 can be in order to the outer surface 14 of the nut 12 of admitting F public connector 11, and a receptacle 48 can be in order to admit the sleeve combination 15 of F public connector 11.Deciding torsion forming part 47 is that an elastic piece structure forms two shell fragments 471 jointly by an axial groove 472 and two 473 of radial grooves; The inner surface of each shell fragment 471 forms at least one fin or ridge 474; This fin 474 becomes closely with the outer surface 14 of nut 12 and contacts; As shown in Figure 6, there is a fin 474 to be formed on the inner surface of shell fragment 471.When instrument 20 when carrying out installation exercise, can avoid instrument when rotated by deciding torsion forming part 47, apply excessive torsion and the outer surface 14 of nut 12 be worn; When in case sealed torque value surpasses; Two shell fragments 471 are forced outwardly and strut, and let decide torsion forming part 47 and separate with the outer surface 14 of nut 12 and can't cooperate, and 20 of instruments can't continue nut 12 rotations like this; So this second box spanner 40 has the qualification of sealed torque value.

In addition, the inner surface of

body

36,46 is formed with one first scalariform push stopping part (stepped stop), 39, the 49 and second scalariform push stopping part 311,411; When instrument 20 when the direction of F public connector 11 is advanced; Can avoid moving of

spanner portion

31,41 and make hexagonal forming part 37 or decide the position of torsion forming part 47 by the first scalariform

push stopping part

39,49, and the second scalariform push stopping part 311,411 can make sleeve combination 15 be positioned at the position of

receptacle

38,48 above nut 12.

Annular end

32,42 is a hollow assembly; Has a front end 321,421 and one terminal 322,422 respectively; Wherein, the front end 321,421 of

annular end

32,42 is attached at the

tail end

35,45 of

spanner portion

31,41, makes the

groove

33,43 of

spanner portion

31,41 lead to annular end 32,42.

Annular end

32,42 comprises a link slot 323,423 and extends to terminal 322,422 from front end 321,421; Link slot 323,423 is inserted first end 23 and second end 24 of connector body 22; And utilize fulcrum 50 to be inserted in 24 at

annular end

32 and 23 at first end and annular end 42 and second end; Making first,

second box spanner

30,40 is that rotate at the center with fulcrum 50, the stowed position that the deployed position of representing like Fig. 2, Fig. 7 and Fig. 8 represent.

Instrument 20 more comprises moves close to somebody's ear 51 to be installed on first box spanner 30 or second box spanner 40, as shown in Figure 2, and in the present embodiment, this moves close to somebody's ear 51 to be installed on the annular end 32 of first box spanner 30, lets on one's body instrument 20 capable of hoisting the hanging over.

Stereogram when Fig. 9 representes that a F male coaxial-cable connector 10 is arranged at first box spanner 30 of instrument 20; Wherein, F public connector 11 is placed in the groove 33 of spanner portion 31; Make nut 12 be arranged in hexagonal forming part 37, sleeve combination 15 is arranged in receptacle 38, and cable 16 can be extended back from spanner portion 31 can be in order to be connected to a certain device.

Stereogram when Figure 10 representes that a F male coaxial-cable connector 10 is arranged at second box spanner 40 of instrument 20; Wherein, F public connector 11 is placed in the groove 43 of spanner portion 41; Nut 12 is arranged in decides torsion forming part 47, sleeve combination 15 is arranged in receptacle 48, and cable 16 can be extended back from spanner portion 41 can be in order to be connected to a certain device.

Fig. 9 and Figure 10 can know the hexagonal forming part 37 that shows

spanner portion

31,41, the position of deciding torsion forming part 47 and annular end 32,42.Hence one can see that, combines or when separating, this coaxial cable 16 can't cause any interference or obstruction for the rotation of instrument 20 among each embodiment for connector no matter be.If by general open-end wrench carry out nut 12 begin unclamp or when finally locking operation because it contiguously has several cables, except meeting causes the obstruction for this open-end wrench, this spanner also can't rotate for nut 12 continuously.Therefore; Compared to embodiment proposed by the invention; The operator can make nut 12 install/remove the rotation that reaches continuous in the process by this instrument 20; Even close position have several and be bending or the situation of the cable of high density state under, the mechanical advantage that this instrument 20 had still is enough to produce appropriate torsion to unclamp for this connector and processing such as locking.

Can know the mode of operation of understanding instrument 20 by Figure 11 and Figure 12.Figure 11, Figure 12 represent to have several F female connectors to be combined in electronic device 60 with compact mode, and each F female connectors links respectively has a F

public connector

11a, 11b, 11c and 11d.Operator selectable is selected and is used first box spanner 30 or second box spanner 40 to be attached on the electronic device 60 of F female connectors.Figure 11 representes that first box spanner 30 is attached on the electronic device 60 of several F female connectors; Figure 12 representes that second box spanner 40 is attached on the electronic device 60 of several F female connectors, can a F public connector be bonded to a F female connectors (or one F public connector removed from the F of electronic device 60 female connectors) of electronic device 60 by first box spanner 30 or second box spanner 40.In present embodiment, the cable 16 that is adjacent to F public connector 11a-11d is bending and high density state, and this crooked and intensive cable also can increase nut 12 required torsion when rotation except meeting influences the side direction strength of F public connector.Cable 16 is placed in first box spanner 30 or second box spanner 40 through

groove

33 or 43; Proceed to move along the length direction of cable 16 subsequently and with first box spanner 30, up to reach between the tail end of the first scalariform push stopping part 39 of this

spanner portion

31,41 and nut 12 cooperatively interact till.Therefore; When installing and first box spanner 30 of removing tool 20 or second box spanner 40 when being arranged at its pairing connector; Install and the hexagonal forming part 37 of removing tool 20 or decide torsion forming part 47 and understand between the outer surface 14 with nut 12 and reach mutual cooperating; Be held in by finger under the effect of first box spanner 30 or second box spanner 40; Let instrument 20 in clockwise manner public connector 11a-11d is incorporated into electronic device 60, or public connector 11 is separated from electronic device 60 with counterclockwise mode.In addition; Instrument 20 is when operation; Use side is not that first box spanner 30 (shown in figure 12) or second box spanner 40 (shown in figure 11) may rotate to 90 degree with as the force side, can effectively nut 12 be arranged on its connector that cooperates by the torsion that this mechanical advantage produced.

Though the present invention discloses as above with preferred embodiment; Right its is not in order to restriction the present invention, anyly knows this technological people, do not breaking away from the spirit and scope of the present invention; Change and retouching when doing, so protection scope of the present invention is as the criterion with what accompanying claim defined.

Claims

1. one kind connects the F male coaxial-cable connector with installing and removing tool; In order to a F public connector is mounted to a F female connectors; This F public connector has a nut, a sleeve combination and a coaxial cable, and this nut is can the revolution mode to be arranged at the front end of this F public connector, and this coaxial cable extends along the tail end rear side of this F public connector; This nut has the inner surface of screw thread and through the hexagonal outer surface of moulding, it is characterized in that: said instrument comprises:

A connection piece has a connection piece body, and this connector body is provided with one first end and one second end;

One first box spanner is linked to first end of this connector, and this first box spanner has a spanner portion and an annular end; This spanner portion is a tube element; And have a front end, a tail end and a hollow body portion; This body is between this front end and this tail end; This body has a groove and extends to tail end by this front end, and the inner surface of this body is provided with between the outer surface of a hexagonal forming part and this nut and cooperates; This annular end is a hollow assembly, comprises the front end and an end of a ring-type, and the front end of this annular end is attached at the tail end of this spanner portion, has the groove that a groove leads to this spanner portion between the front end of this annular end and end;

One second box spanner is linked to second end of this connector, and this second box spanner has a spanner portion and an annular end; This spanner portion is a tube element; Have a front end, a tail end and a hollow body portion; This body is between this front end and this tail end, and this body has a groove and extends to tail end by this front end, and the inner surface of this body is provided with between the outer surface of certain torsion forming part and this nut and cooperates; When the sealed torque value of second box spanner surpasses, force this to decide the torsion forming part and separate with nut; This annular end is a hollow assembly, comprises the front end and an end of a ring-type, and the front end of this annular end is attached at the tail end of this spanner portion, has the groove that a groove leads to this spanner portion between the front end of this annular end and end.

2. connection F male coaxial-cable connector as claimed in claim 1 is with installing and removing tool; It is characterized in that: the inner surface of the spanner portion of said first, second box spanner is formed with one first scalariform push stopping part respectively, reaches the position that is moved beyond nut of deciding the torsion forming part to avoid hexagonal forming part.

3. connection F male coaxial-cable connector as claimed in claim 2 is with installing and removing tool; It is characterized in that: the inner surface of the spanner portion of said first, second box spanner is formed with one second scalariform push stopping part; Between the first scalariform push stopping part and the second scalariform push stopping part, be formed with a receptacle, make this sleeve combination be arranged in receptacle by this second scalariform push stopping part.

4. connection F male coaxial-cable connector as claimed in claim 1 is characterized in that with installing and removing tool: said to decide the torsion forming part be an elastic piece structure.

5. connection F male coaxial-cable connector as claimed in claim 4 is characterized in that with installing and removing tool: said elastic piece structure forms two shell fragments jointly by an axial groove and two radial groove institutes.

6. connection F male coaxial-cable connector as claimed in claim 5 is characterized in that with installing and removing tool: the inner surface of said elastic piece structure forms and at least onely becomes the tight fin that contacts with the outer surface of nut.

7. connection F male coaxial-cable connector as claimed in claim 1 is with installing and removing tool, and it is characterized in that: the annular end of said first box spanner is provided with one and moves close to somebody's ear.

8. connection F male coaxial-cable connector as claimed in claim 1 is with installing and removing tool, and it is characterized in that: the annular end of said second box spanner is provided with one and moves close to somebody's ear.

9. connection F male coaxial-cable connector as claimed in claim 1 is with installing and removing tool; It is characterized in that: the annular end of said first, second box spanner comprises a link slot; And insert between first end of annular end and connector with a fulcrum and between second end of annular end and connector, making first, second box spanner is that the center rotation becomes and opens/fold with the fulcrum.