CN107991793B

CN107991793B - A kind of magnetic-type multilayer glasses

Info

Publication number: CN107991793B
Application number: CN201810064857.8A
Authority: CN
Inventors: 金阳骞
Original assignee: Zhejiang Dili Glasses Ltd By Share Ltd
Current assignee: Zhejiang Dili Glasses Ltd By Share Ltd
Priority date: 2018-01-23
Filing date: 2018-01-23
Publication date: 2019-05-24
Anticipated expiration: 2038-01-23
Also published as: CN107991793A

Abstract

The invention discloses a kind of magnetic-type multilayer glasses, a kind of magnetic-type multilayer glasses include frame, foot prop and the auxiliary frame as functional lenses carrier, the frame includes two symmetrical unit frames and the bridge portion that is connected between two unit frames, and the foot prop is fixed on the inside of the one end of unit frame far from bridge portion；Indent is provided at least one caulking groove on the outer side surface of the unit frame, it is concordant with the lateral wall of unit frame and close the pin shaft of the opening of caulking groove to be embedded with outer end face when being entirely retracted in caulking groove for sliding in the caulking groove, and the 4th magnet for forcing pin shaft to be entirely retracted in caulking groove is embedded in the interior sidewall surface of unit frame；Be provided in the auxiliary frame with for pin shaft interlocking but depth be less than pin shaft length access slot, be provided with strong magnetically attractive iron pin shaft being adsorbed in access slot in the auxiliary frame, with while providing auxiliary frame quick-replaceable and meet individual requirements, the advantages of improving the comfort and aesthetics of glasses.

Description

A kind of magnetic-type multilayer glasses

Technical field

The present invention relates to a kind of glasses, in particular to a kind of magnetic-type multilayer glasses.

Background technique

With the development of the times, demand of the current people to personalized is higher and higher, while glasses are normal as many day for human beings A part of life, shape can just protrude itself style.Therefore, the need of decoration how are met in the structure design of glasses It asks, becomes the new growth point and competitiveness of spectacles industry.

People need to wear light distribution mirror holder to cooperate the needs of eye correction eyesight.In many cases, such as strong The sun under, while needing to wear lens, it is also desirable to sunglasses.

People can be allowed simply to replace gadget with the glasses accessory of easy replacement, to change glasses are apparent Become full the demand of foot personalization.

The said goods are connected with main glasses holder mainly to be dismounted in such a way that structure partial clamps, but the additional mirror of this mode The comfort and aesthetics of sector-meeting reduction glasses；And inconvenient for use, stability is poor.

Therefore, it is highly desirable in this field there is the tight demand connected between main glasses holder and ornamental part is improved It is a kind of to design what generation was excessively limited and met individual requirements to glasses while reinforcing being completely embedded degree The glasses of interchangeable decorative accessory.

Summary of the invention

The object of the present invention is to provide a kind of magnetic-type multilayer glasses, reach while reinforcing being completely embedded degree not The effect excessively limited can be generated to the design of glasses.

Above-mentioned technical purpose of the invention has the technical scheme that

A kind of magnetic-type multilayer glasses, including frame, foot prop and auxiliary frame as functional lenses carrier, the frame Unit frame is fixed on far from bridge including two symmetrical unit frames and the bridge portion being connected between two unit frames, the foot prop The inside of the one end in portion；Indent is provided at least one caulking groove on the outer side surface of the unit frame, and sliding is embedding in the caulking groove The pin shaft of opening that is concordant with the lateral wall of unit frame and closing caulking groove equipped with outer end face when being entirely retracted in caulking groove, unit frame The 4th magnet for forcing pin shaft to be entirely retracted in caulking groove is embedded in interior sidewall surface；It is provided in the auxiliary frame and rabbets with for pin shaft But depth is less than the access slot of pin shaft length, is provided with the strong magnetically attractive iron being adsorbed to pin shaft in access slot in the auxiliary frame.

Using the above scheme, the 4th magnet keeps pin shaft to be embedded state, so that the outer surface of unit frame keeps complete State keeps smooth and beautiful appearance of frame when being used alone；It is when needing additional functional eyeglass, auxiliary frame is close Frame will be adsorbed in access slot by the effect of strong magnetically attractive iron, and at this point, pin shaft is still partially in caulking groove, also It is that pin shaft can play the role of support to auxiliary frame at this time, to reinforce the stability that auxiliary frame is connect with frame；And auxiliary frame can match Standby various functional eyeglasses, such as antiultraviolet, anti-blue light, 3D eyeglass, thus reaching with a pair of glasses while can carry The effect of myoporthosis eyeglass and functional lenses.

Further preferably are as follows: the outer wall of the pin shaft protrude above be provided with limit card convex circumferentially in long strip with And the guiding card convex axially extended；Wherein guiding card convex is connected to limit card convex close to the side of caulking groove slot bottom, and guide card Protrusion height that is convex and limiting outer wall of the card convex relative to pin shaft is gradually reduced by intersection location to the respective end of the two； The caulking groove includes the outer groove of inside groove and connection opening, wherein the inner wall of inside groove along axial indent be provided with receiving guiding card convex and Limit the slideway of card convex.

Using the above scheme, during pin shaft is packed into caulking groove, guiding card convex is contacted with the outer wall of outer groove first, and Elastic deformation is generated on surface, mutually to form evacuation；And this elastic deformation centered on being oriented to card convex to circumferential both ends Smooth concave surface is formed, before limit card convex is abutted with the circumferential surface of outer groove, pre- deformation is had been carried out in the circumferential surface of outer groove, can Further deformation is carried out more smoothly to limit card convex, until when limit card convex enters inside groove and cooperates with slideway, deformation Partial reset, pin shaft be free to slide in slideway at this time；During being detached from outward after cooperation due to pin shaft, lack It is oriented to pre- deformation less, goes out to be detached from more difficult, therefore also ensures that pin shaft can be under the situation for not destroying frame structure It is relatively easy to be packed into caulking groove, but not is detached from the pulling of auxiliary frame.

Further preferably are as follows: the top of one end that the guiding card convex intersects with limit card convex and the top horizontal of limit card convex Together.

Using the above scheme, so that the deformation variation of curved surface is more uniform, abrasion is smaller when being packed into, can be preferable Remain intact structure.

Further preferably are as follows: along foot prop length side on the lateral wall that the unit frame is connected with bridge portion and with foot prop To projection handover lateral wall on be provided with a caulking groove and be arranged in pin shaft in caulking groove.

Using the above scheme, auxiliary frame can be defined at both ends close to the pin shaft of foot prop, is to guarantee that auxiliary frame is stable Primary attachment point, and close to bridge portion pin shaft can make frame such as because shape of face is larger twist when, keep auxiliary frame and Frame is stably connected with.

Further preferably are as follows: the pin shaft after being embedded in access slot with the slot bottom of access slot separately.

Using the above scheme, tension precompression is remained between strong magnetically attractive iron and pin shaft, auxiliary frame and frame are made with this Between be not likely to produce gap.

Further preferably are as follows: the top surface in the bridge portion or bottom surface indent are provided with the first catching groove, and the slot bottom of the first catching groove is set It is equipped with third magnetic pole, is provided in the auxiliary frame and the first catching groove grafting and the snapping component that attracts each other with third magnetic pole.

Using the above scheme, when being assembled, auxiliary frame is close to frame, snapping components insertion and first In catching groove, attraction and the first magnetic pole by third magnetic pole attract each other with the second magnetic pole, and snapping component is fully inserted into first and buckles It in slot and keeps adsorbing pulling force on vertical direction, the stability after strengthening connection.

Further preferably are as follows: the snapping component include the first cramp, the first blade-rotating for being fixed to first cramp one end and It is connected to the second blade-rotating of auxiliary frame, wherein the first cramp and the first catching groove grafting and being provided in end is mutually inhaled with third magnetic pole The 4th magnetic pole drawn, first blade-rotating are connect with the second blade-rotating damping rotary.

Using the above scheme, by the effect of blade-rotating and the first cramp, the auxiliary frame is allowed to be with the end of the first cramp Fulcrum overturns auxiliary frame, i.e., so that between auxiliary frame and frame can be with the transformation daylighting state of instantaneity, but also glasses Overall style multiplicity, can obtain a variety of decorative effects, and damping rotary therein can be by the quiet position in needs of auxiliary frame, such as When the eyeglass of auxiliary frame is polariscope, sunbonnet can be played the role of by turning over, and such as 3D eyeglass, can be turned at any time and be used normal use Glasses.

Further preferably are as follows: the setting of one end of first blade-rotating is arranged there are two the first lug in second blade-rotating There is the second lug between two the first lugs, is equipped with damping screw in first lug and the second lug；It is described The nut of damping screw is embedded at the first lug and deviates from one end of the second lug, and is embedded in one end of another the first lug The nut being threadedly coupled with damping screw.

Using the above scheme, the second lug is held between two the first lugs, after being compressed by nut, the first lug with The both ends that second lug abuts will generate damping, and adjusting the elastic of damping screw can be adjusted damping size, and being realized with this can be with Auxiliary frame is adjusted and is stable at any angular position.

Further preferably are as follows: the foot prop includes the branch for being rotationally connected with the trunk of frame and being connected to trunk one end Dry, one end of the branch and Truck Connection is fixed with the driver bit that head is arranged in trunk, is provided in the trunk Adsorb the 5th magnet of driver bit.

Using the above scheme, under normal service condition, driver bit is arranged in trunk, and provided by the 5th magnet Precompression keeps the assemble stable of driver bit, to keep the integrality and aesthetics of frame；When need using when, use Power separates branch together with driver bit with trunk, can adjust the elastic and damping screw elastic of foot prop at any time with this.

Further preferably are as follows: the driver bit includes the inner sheet for being fixed on branch end and the side for being socketed on inner sheet Outer plate, wherein outer plate includes end and the foot for being combined with each other into U-shaped, and the inner end of the end is provided with the first card slot, institute State be provided at the top of inner sheet outer plate it is vertical in inner sheet when cooperate the second card slot of interlocking, the outboard end of the inner sheet sets It is equipped with third card slot, the inner end of the foot is provided with the third card convex with the cooperation of third card slot.

The general diameter of screw due to damping screw and for fixing foot prop is smaller, generally mostly uses ten to reduce to skid First card slot is passed through the outer wall that the second card slot is embedded in inner sheet, while the second card slot is embedded in outer plate using the above scheme by word slot Outer wall is combined into cross-shaped knife head, carry out elastic operation with the screw to crosshead.Usually it is being not required to state to be used When, inner sheet and outer plate are split and the foot of outer plate is socketed on the side of inner sheet, with this inner sheet and outer plate are weighed It is stacked as the sheet of "-" type, to reduce space hold, and driver bit is easily embedded in trunk.Therein The cooperation of two draw-in groove and the second card convex can prevent outer plate and inner sheet from being detached from and fall in trunk when driver bit is drawn out Slot in.

In conclusion the invention has the following advantages:

1, frame is cooperated with quick-replaceable auxiliary frame, a pair of glasses is allowed to carry myoporthosis eyeglass and function simultaneously Property eyeglass effect, guarantee glasses it is original using function on the basis of greatly improve glasses use function diversity；

2, additional eyeglass can by auxiliary frame adjustment realize multiple angles adjusting to improve the comfort used And convenience.

Detailed description of the invention

Fig. 1 is the overall structure figure of the glasses of embodiment 1；

Fig. 2 is the structure chart of the unit frame of embodiment 1；

Fig. 3 is the effect schematic diagram of the pin shaft of embodiment 1；

Fig. 4 is enlarged drawing of the Fig. 2 of embodiment 1 at B；

Fig. 5 is enlarged drawing of the Fig. 1 of embodiment 1 at A；

Fig. 6 is the overall structure figure of the glasses of embodiment 2；

Fig. 7 is enlarged drawing of the Fig. 6 of embodiment 2 at C；

Fig. 8 is enlarged drawing of the Fig. 6 of embodiment 2 at D.

In figure, 1, frame；2, foot prop；3, auxiliary frame；4, absorbent module；5, snapping component；6, pin shaft；10, mechanism for assembling-disassembling； 11, unit frame；12, bridge portion；13, the first catching groove；14, caulking groove；141, inside groove；142, outer groove；143, slideway；20, driver bit； 21, trunk；22, branch；23, accommodation groove；24, inner sheet；241, the second card slot；242, third card slot；25, outer plate；251, end； 252, foot；253, the first card slot；254, third card convex；31, the second catching groove；32, access slot；41, the first magnetic pole；42, the second magnetic Pole；51, the first cramp；52, the first blade-rotating；53, the second blade-rotating；54, the second cramp；55, damping screw；551, nut；56, One lug；57, the second lug；58, nut；60, card convex component；61, it is oriented to card convex；62, card convex is limited.

Specific embodiment

Below in conjunction with attached drawing, invention is further described in detail.

This specific embodiment is only explanation of the invention, is not limitation of the present invention, those skilled in the art Member can according to need the modification that not creative contribution is made to the present embodiment after reading this specification, but as long as at this All by the protection of Patent Law in the protection scope of invention.

Embodiment 1: a kind of magnetic-type multilayer glasses, as shown in Figure 1, including frame 1, foot prop 2, being used as functional lenses load The auxiliary frame 3 of body and the mechanism for assembling-disassembling 10 being quickly fixed on auxiliary frame 3 on frame 1.Wherein, frame 1 includes two symmetrical Unit frame 11 and the bridge portion 12 being connected between two unit frames 11, foot prop 2 are fixed on one of unit frame 11 far from bridge portion 12 The inside at end, auxiliary frame 3 are connected to the outside of frame 1.

Referring to Fig. 2 and Fig. 3, mechanism for assembling-disassembling 10 includes that the caulking groove 14 being set on the outer side surface of unit frame 11, sliding are embedding Pin shaft 6 in caulking groove 14 and the card convex component 60 for preventing pin shaft 6 to be detached from.When pin shaft 6 is entirely retracted in caulking groove 14, end Face is concordant with lateral wall and closes the opening of caulking groove 14.It is embedded in the interior sidewall surface of unit frame 11 and pin shaft 6 is forced to be completely embedded into Reset magnet in caulking groove 14.It is provided in auxiliary frame 3 and the access slot 32 less than 6 length of pin shaft for the interlocking of pin shaft 6 but depth, auxiliary frame Be provided with strong magnetically attractive iron pin shaft 6 being adsorbed in access slot 32 on 3.Slot bottom phase of the pin shaft 6 after being embedded in access slot 32 with access slot 32 Interval.

It is handed on the lateral wall that unit frame 11 and bridge portion 12 connect and with the projection along 2 length direction of foot prop of foot prop 2 It is provided with a caulking groove 14 on the lateral wall connect and is arranged in pin shaft 6 in caulking groove 14.

Referring to Fig. 3 and Fig. 4, card convex component 60 includes protruding above the in long strip of setting in the outer wall of pin shaft 6 and circumferentially prolonging The limit card convex 62 stretched and the guiding card convex 61 axially extended；Wherein guiding card convex 61 is connected to limit card convex 62 close to embedding The side of 14 slot bottom of slot, and be oriented to card convex 61 and limit card convex 62 relative to the outer wall of pin shaft 6 protrusion height by the two Intersection location to respective end is gradually reduced.The top of one end that guiding card convex 61 intersects with limit card convex 62 and limit card convex 62 top is concordant.Caulking groove 14 includes the outer groove 142 of inside groove 141 and connection opening, and wherein the inner wall of inside groove 141 is along axial indent It is provided with the slideway 143 for accommodating guiding card convex 61 and limiting card convex 62.

Referring to Fig. 5, foot prop 2 includes being rotationally connected with the trunk 21 of frame 1 and being connected to the branch 22 of 21 one end of trunk, One end that branch 22 is connect with trunk 21 is fixed with the driver bit 20 in the accommodation groove 23 that head is arranged in trunk 21, trunk It is provided with the 5th magnet of absorption driver bit 20 in 21, is socketed with rubber pad on the outer wall of branch 22.

Driver bit 20 includes the outer plate 25 for being fixed on the inner sheet 24 of 22 end of branch and being socketed on the side of inner sheet 24, Middle outer plate 25 includes that end 251 and foot 252, the inner end of end 251 of the intercombination at U-shaped are provided with the first card slot 253, The top of inner sheet 24 be provided with outer plate 25 it is vertical in inner sheet 24 when cooperate the second card slot 241 of interlocking, inner sheet 24 it is outer Side is provided with third card slot 242, and the inner end of foot 252 is provided with the third card convex 254 cooperated with third card slot 242.

Action principle:

Referring to Fig. 2 and Fig. 3, the assembly of auxiliary frame 3: auxiliary frame 3 will be adsorbed to close to frame 1 by the effect of strong magnetically attractive iron In access slot 32, at this point, pin shaft 6 is still partially in caulking groove 14, pin shaft 6 can play the work of support and attraction to auxiliary frame 3 With holding assembly is stablized.

The disassembly of auxiliary frame 3: auxiliary frame 3 is pulled open, and due to the effect of the reset magnet in caulking groove 14, pin shaft 6 is adsorbed to embedding In slot 14, and it is concordant with 1 outer wall of frame with end.

Referring to Fig. 5, the usage of foot prop 2: screwdriver need to be used as in use, firmly by branch 22 together with driver bit 20 and master First card slot 253 of outer plate 25 is passed through the outer wall that the second card slot 241 is embedded in inner sheet 24, while the second card slot 241 by dry 21 separation Embedded in the outer wall of outer plate 25, that is, it is combined into cross-shaped knife head, elastic operation is carried out with the screw to crosshead.Zang Na is needed to withdraw When, inner sheet 24 and outer plate 25 are split and the foot of outer plate 25 252 is socketed on the side of inner sheet 24, inner sheet 24 is made with this It can be laminated in the sheet of "-" type with outer plate 25, be then inserted into driver bit 20 in the slot of trunk 21.

Embodiment 2: as schemed, shown in 6, difference from example 1 is that, mechanism for assembling-disassembling 10 further includes absorbent module 4 With snapping component 5, absorbent module 4 acts on the abutment surface of frame 1 Yu auxiliary frame 3, and snapping component 5 acts on bridge portion 12.

Referring to Fig. 7, absorbent module 4 includes being set to the first magnetic pole 41 of 11 inside of unit frame and being set in auxiliary frame 3 The second magnetic pole 42 of side to attract each other with the first magnetic pole 41.

Referring to Fig. 8, the first blade-rotating 52, damping that snapping component 5 includes the first cramp 51, is fixed on 51 one end of the first cramp It is rotatablely connected to the second blade-rotating 53 of the first blade-rotating 52 and is fixed on second cramp 54 of 53 one end of the second blade-rotating, wherein first Cramp 51 is plugged to the first catching groove 13 of the top surface setting in bridge portion 12, and the slot bottom of the first catching groove 13 is provided with third magnetic pole, and first The end of cramp 51 is provided with the 4th magnetic pole to attract each other with third magnetic pole.It is provided in auxiliary frame 3 for 54 grafting of the second cramp The second catching groove 31 and keep 54 inserting state of the second cramp snapping magnet.

One end setting of first blade-rotating 52 is provided in second blade-rotating 53 and is connect embedded in two first there are two the first lug 56 The second lug 57 between ear 56, the inner wall of the second lug 57 are tapered.Resistance is equipped in first lug 56 and the second lug 57 Buddhist nun's screw 55, the nut 551 of damping screw 55 are embedded at one end that the first lug 56 deviates from the second lug 57, and another the One end of one lug 56 is embedded with the nut 58 being threadedly coupled with damping screw 55.After tightening, the outer wall of damping screw 55 and The inner wall of two lugs 57 abuts.To be applied on the inner wall of the outer wall of damping screw 55 and the second lug 57 by heavy damping effect It is covered with damping coatings.

Action principle:

Referring to figure 6 and figure 7, auxiliary frame 3 is into the dismounting for passing through absorbent module 4: by auxiliary frame 3 close to frame 1, by the first magnetic pole 41 With attracting each other for the second magnetic pole 42, auxiliary frame 3 is attached at frame 1, completes combination, and when disassembly is broken into two with one's hands.

Referring to Fig. 8, the first cramp 51 of snapping component 5 and the second cramp 54 additional snapping component 5: are inserted into first respectively In catching groove 13 and the second catching groove 31, attracted by the magnet in two catching grooves, snapping component 5 is tightened up automatically, at this time can be with the The end of one cramp 51 is fulcrum, and auxiliary frame 3 is overturn.

Claims

1. a kind of magnetic-type multilayer glasses, including frame (1), foot prop (2) and auxiliary frame (3) as functional lenses carrier, The frame (1) includes two symmetrical unit frames (11) and the bridge portion (12) being connected between two unit frames (11), institute State the inside that foot prop (2) is fixed on the one end of unit frame (11) far from bridge portion (12)；It is characterized in that: the unit frame (11) is outer Indent is provided at least one caulking groove (14) in side wall surface, and sliding, which is embedded with, in the caulking groove (14) is entirely retracted in caulking groove (14) When outer end face it is concordant with the lateral wall of unit frame (11) and close the pin shaft (6) of the opening of caulking groove (14), unit frame (11) it is interior The reset magnet for forcing pin shaft (6) to be completely embedded into caulking groove (14) is embedded in side wall surface；It is provided with and supplies on the auxiliary frame (3) Pin shaft (6) interlocking but depth are less than the access slot (32) of pin shaft (6) length, are provided on the auxiliary frame (3) and are adsorbed to pin shaft (6) Strong magnetically attractive iron in access slot (32).

2. a kind of magnetic-type multilayer glasses according to claim 1, it is characterized in that: the outer wall of the pin shaft (6) protrudes above The guiding card convex (61) for being provided with limit card convex (62) circumferentially in long strip and axially extending；Wherein guide card Convex (61) are connected to limit card convex (62) close to the side of caulking groove (14) slot bottom, and are oriented to card convex (61) and limit card convex (62) phase The protrusion height of the outer wall of pin shaft (6) is gradually reduced by intersection location to the respective end of the two；The caulking groove It (14) include the outer groove (142) of inside groove (141) and connection opening, wherein the inner wall of inside groove (141) is provided with appearance along axial indent Receive guiding card convex (61) and limit card convex (62) slideway (143).

3. a kind of magnetic-type multilayer glasses according to claim 2, it is characterized in that: the guiding card convex (61) and limiting card The top of one end of convex (62) intersection is concordant with the limit top of card convex (62).

4. a kind of magnetic-type multilayer glasses according to claim 1, it is characterized in that: the unit frame (11) and bridge portion (12) It is provided with along the lateral wall of the projection handover of foot prop (2) length direction on the lateral wall connected and with foot prop (2) One caulking groove (14) and it is arranged in caulking groove (14) interior pin shaft (6).

5. a kind of magnetic-type multilayer glasses according to claim 1, it is characterized in that: the pin shaft (6) is in insertion access slot (32) afterwards with the slot bottom of access slot (32) separately.

6. a kind of magnetic-type multilayer glasses according to claim 1, it is characterized in that: the top surface or bottom surface in the bridge portion (12) Indent is provided with the first catching groove (13), and the slot bottom of the first catching groove (13) is provided with third magnetic pole, be provided on the auxiliary frame (3) with (13) grafting of first catching groove and the snapping component (5) to attract each other with third magnetic pole.

7. a kind of magnetic-type multilayer glasses according to claim 6, it is characterized in that: the snapping component (5) includes first Cramp (51), the first blade-rotating (52) for being fixed to the first cramp (51) one end and the second blade-rotating (53) for being connected to auxiliary frame (3), In the first cramp (51) and (13) grafting of the first catching groove and the 4th magnetic pole to attract each other with third magnetic pole, institute are provided in end The first blade-rotating (52) is stated to connect with the second blade-rotating (53) damping rotary.

8. a kind of magnetic-type multilayer glasses according to claim 7, it is characterized in that: one end of first blade-rotating (52) is set There are two setting the first lug (56), second be provided between two the first lugs (56) on second blade-rotating (53) is connect Ear (57) is equipped with damping screw (55) in first lug (56) and the second lug (57)；The damping screw (55) Nut (551) is embedded at one end that the first lug (56) deviate from the second lug (57), and the one of another the first lug (56) End is embedded with the nut (58) being threadedly coupled with damping screw (55).

9. a kind of magnetic-type multilayer glasses according to claim 8, it is characterized in that: the foot prop (2) includes rotation connection In frame (1) trunk (21) and be connected to the branch (22) of trunk (21) one end, the branch (22) and trunk (21) are even The one end connect is fixed with the driver bit (20) that head is arranged in trunk (21), is provided with absorption screw in the trunk (21) 5th magnet of cutter head (20).

10. a kind of magnetic-type multilayer glasses according to claim 9, it is characterized in that: the driver bit (20) includes solid Due to branch (22) end inner sheet (24) and be socketed on inner sheet (24) side outer plate (25), wherein outer plate (25) includes phase It is mutually combined into end (251) and the foot (252) of U-shaped, the inner end of the end (251) is provided with the first card slot (253), institute The second card slot (241) being provided at the top of inner sheet (24) in the vertical interlocking that cooperates when inner sheet (24) of outer plate (25) is stated, The outboard end of the inner sheet (24) is provided with third card slot (242), and the inner end of the foot (252) is provided with and third card slot (242) the third card convex (254) cooperated.