CN105155953A - Hidden hinge capable of sliding - Google Patents

Hidden hinge capable of sliding Download PDF

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Publication number
CN105155953A
CN105155953A CN201510531375.5A CN201510531375A CN105155953A CN 105155953 A CN105155953 A CN 105155953A CN 201510531375 A CN201510531375 A CN 201510531375A CN 105155953 A CN105155953 A CN 105155953A
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China
Prior art keywords
slide rail
wedge
spring
hinge
balladeur train
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Granted
Application number
CN201510531375.5A
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Chinese (zh)
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CN105155953B (en
Inventor
张慧萍
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706th Institute Of No2 Research Institute Casic
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706th Institute Of No2 Research Institute Casic
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Priority to CN201510531375.5A priority Critical patent/CN105155953B/en
Publication of CN105155953A publication Critical patent/CN105155953A/en
Application granted granted Critical
Publication of CN105155953B publication Critical patent/CN105155953B/en
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Abstract

The invention discloses a hidden hinge capable of sliding. The hidden hinge capable of sliding comprises a hinge body, a sliding rail, a sliding frame, a covering plate, a wedge-shaped block, a spring and a non-falling screw, wherein the hinge body is arranged at one end of the sliding frame; the sliding rail is a box body with a transverse notch; bosses are arranged at the notch of the sliding rail transversely symmetrically; the sliding frame is provided with two guide grooves, the two bosses of the sliding rail penetrate through the two guide grooves respectively so that the sliding frame can slide leftwards and rightwards along the notch of the sliding rail, and the sliding frame is limited through the bosses; the covering plate is fixed to the sliding rail to cover the sliding rail and provided with a stepped hole, and the non-falling screw is arranged in the stepped hole and sleeved with the spring; the wedge-shaped block and the spring are connected with the non-falling screw, are combined on the inner side of the stepped hole in a combined mode and can reciprocate in the elastic direction of the spring; the non-falling screw can move in the stepped hole, the spring is compressed through the wedge-shaped block, and the wedge-shaped block is ejected out through the spring; a connecting part between the two guide grooves of the sliding frame is provided with an inclined surface matched with an inclined surface of the wedge-shaped block; the wedge-shaped block can be compressed by the inclined surface of the sliding frame and combined on the other surface of the connecting part between the two guide grooves of the sliding frame in a clamped mode.

Description

Slidably built-in hinge
Technical field
The present invention relates to a kind of hinge, the particularly slidably a kind of and hinge of stealth.
Background technology
At present, a lot of equipment all will use hinge arrangement, when the door of equipment and fixed end have protruding component near hinge installation place, there will be interferences, collide, so that dodge gate can not be opened completely with existing hinge mounting means when opening dodge gate.
Summary of the invention
The object of the present invention is to provide one slidably built-in hinge, solve the problem of current dodge gate limitations.
One of the present invention slidably built-in hinge, wherein, comprising: hinge, slide rail, balladeur train, cover plate, wedge, spring and not releasing screw; Wherein, hinge is arranged on one end of balladeur train; This slide rail is the box body with horizontal cut, and the indentation, there of slide rail has the boss of lateral symmetry, balladeur train to have two guide grooves, is each passed through two boss of slide rail, can horizontally slips along the breach of slide rail, and spacing by boss; Cover plate and slide rail are fixed, and to hide slide rail, cover plate has stepped hole, releasing screw is not arranged in stepped hole, and spring housing is located at not on releasing screw, and wedge and spring and not releasing screw are connected, and be fastened on inside stepped hole, and can move back and forth along the elastic force direction of spring; Releasing screw 11 can not move in stepped hole, by this wedge Compress Spring, and flicks wedge by spring; Connecting portion between two guide grooves of balladeur train has an inclined-plane, mates with the inclined-plane of wedge; This wedge can be compressed by the inclined-plane of balladeur train, and the another side of connecting portion between two guide grooves being fastened on balladeur train.
According to an embodiment of the present invention's slidably built-in hinge, wherein, this stepped hole is divided into three sections, and outermost is screwed hole, is middlely used for arranging and limit spring for circular hole, and be square hole, this square hole mates with wedge.
According to an embodiment of the present invention's slidably built-in hinge, wherein, the orthogonal box body of this slide rail, inner chamber has the longitudinally symmetrical and square groove that length is equal with cavity length, is respectively the narrow groove of two place's sipes and close center two place near inwall.
According to an embodiment of the present invention's slidably built-in hinge, wherein, also comprise: press strip, be placed in the cavity formed between the sipes of this slide rail and cover plate, press strip sidepiece has multiple oval-shaped slot; Multiple roller bearing, is arranged in this oval-shaped slot, and with the upper and lower surface contact of this balladeur train.
According to an embodiment of the present invention's slidably built-in hinge, wherein, also comprise: sliver, fix with this balladeur train, be placed in the narrow groove of this slide rail.
According to an embodiment of the present invention's slidably built-in hinge, wherein, also comprise: multiple spring-loaded plunger, this resilient plunger head is spherical, through the sidewall of this slide rail, is symmetrical arranged, and this resilient plunger head contacts with this balladeur train.
To sum up, hinge combines with slide rail by the present invention, can be arranged on movable end by the door of equipment by hinge, avoids the interference of component on door and fixed end component; During unlatching, first outwards extract door out a segment distance, then rotating opening door, and by wedge and spring, the door opened is carried out reverse stop, avoid dodge gate and be closed under fortuitous event, improve the reliability of equipment; When door is closed, hinge is hidden into device interior, and gap is very little, can not affect the attractive in appearance of equipment profile.
Accompanying drawing explanation
Figure 1 shows that the structural representation of slidably built-in hinge of the present invention;
Figure 2 shows that the side sectional view of Fig. 1;
Figure 3 shows that the slide rail schematic diagram of slidably built-in hinge;
Fig. 4 is balladeur train schematic diagram;
Figure 5 shows that cover plate schematic diagram;
Figure 6 shows that the schematic diagram of press strip;
Figure 7 shows that wedge schematic diagram;
Figure 8 shows that roller bearing schematic diagram;
Figure 9 shows that the schematic diagram of sliver;
Figure 10 shows that the schematic diagram of spring-loaded plunger.
Detailed description of the invention
For making object of the present invention, content and advantage clearly, below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.
Figure 1 shows that the structural representation of slidably built-in hinge of the present invention, Figure 2 shows that the side sectional view of Fig. 1, as shown in Figure 1 and Figure 2, slidably built-in hinge comprises: hinge 1, slide rail 2, balladeur train 3, cover plate 4, press strip 5, wedge 6, roller bearing 7, sliver 8, spring-loaded plunger 9, spring 10, not releasing screw 11 and screw 12.
Wherein, this slide rail 2 is the box body with horizontal cut 21, and the indentation, there of slide rail 2 has the boss 26 of lateral symmetry, balladeur train 3 to have two guide grooves, is each passed through two boss 26 of slide rail 2, can horizontally slip along the breach 21 of slide rail 2, and spacing by boss 26; Cover plate 4 is fixed with slide rail 2, to hide slide rail 4, cover plate 4 has stepped hole, releasing screw 11 is not arranged in stepped hole, spring 10 is set in not on releasing screw 11, wedge 6 and spring 10 and not releasing screw 11 are connected, and are fastened on inside stepped hole, and can move back and forth along the elastic force direction of spring 10; Releasing screw 11 can not move in stepped hole, by this wedge 6 Compress Spring 10, and flicks wedge 6 by spring 10; Connecting portion between two guide grooves of balladeur train 3 has an inclined-plane, mates with the inclined-plane of wedge 6; This wedge 6 can be compressed by the inclined-plane of balladeur train 3, and the another side of connecting portion between two guide grooves being fastened on balladeur train 3.
Figure 3 shows that the slide rail schematic diagram of slidably built-in hinge, as shown in Figure 2, slide rail 2 is the rectangular box with horizontal cut 21, all there is screwed hole 22 at four angles of slide rail 2 end face, the indentation, there of slide rail 2 has two director's round boss 26 of lateral symmetry, and there are 4 tapped through holes 25 in the direction of the upper lower wall of vertical slide rail 2.Slide rail 2 surrounding has 4 mounting ears 24, and mounting ear 24 has tapped through hole.The inner chamber of rectangular box has longitudinal direction symmetrical and the square groove that length is equal with cavity length, is respectively near two place's sipes 27 of inwall with near the narrow groove 23 in center two place.
Fig. 4 is balladeur train schematic diagram, and as shown in Figure 3 and 4, balladeur train 3 is strip, and there are two place's guide grooves 31 and 32 at the middle part of balladeur train 3, and right side guide groove 31 left end has inclined-plane.The low order end of balladeur train 3 has the pin-and-hole 33 installing hinge 1.As shown in Figure 3 and 4, two guide grooves 31 and 32 of balladeur train 3 are each passed through two boss 26 of slide rail 2, can horizontally slip along the breach 21 of slide rail 2.
Figure 5 shows that cover plate schematic diagram, as shown in Fig. 2 and Fig. 5, the length and width of cover plate 4 is equal with slide rail 2, and thickness direction has boss, boss height is 5.5mm, and all there is through hole 41 at four angles of cover plate 4, four through holes 41 are identical with the position of the screwed hole 22 of slide rail 2 four jiaos, and aperture is 3.5mm; Have the two narrow grooves 42 in place inside cover plate 4, the size of narrow groove 42 and position identical with the narrow groove 23 inside slide rail 2; Cover plate 4 boss right-hand member has stepped hole 43, is divided into three sections, and outermost is screwed hole, and screwed hole diameter is 3mm, and length is 1.5mm, and centre is circular hole, and diameter is 5mm, and length is 3.5mm, and inner side be square hole, and long is 9mm, and wide is 8mm.
Figure 6 shows that the schematic diagram of press strip, as shown in Figure 2 and 6, press strip 5 is rectangular structure, and the length of press strip 5 is 54mm, and wide is 6mm, and thick is 8mm; Width along press strip 5 has a plane of sinking 51, and the degree of depth of sinking is 1mm, and plane is long is 54mm, and wide is 6.5mm, perpendicular to uniform 3 oval-shaped slot 52 of thickness direction in plane, and the center to center distance plane 1mm of circle, radius is 2.3mm; Press strip 5 is placed in the cavity that the sipes of slide rail 2 and cover plate 4 are formed.
Figure 7 shows that wedge schematic diagram, as shown in Fig. 2 and Fig. 7, wedge 6 is the bevelled cuboid in side, and length and width is 7.6mm, and height is 6mm, and chamfer is 4mm × 50 °, and there is screwed hole at wedge 6 center, and the diameter of thread is 3mm, is 5mm deeply.
Figure 8 shows that roller bearing schematic diagram, as shown in Fig. 2, Fig. 6 and Fig. 8, roller bearing 7 is cylindrical, and diameter is 4.5mm, and length is 6.5mm, and roller bearing 7 is placed in the oval-shaped slot of press strip 5, and with the upper and lower surface contact of balladeur train 3.
Figure 9 shows that the schematic diagram of sliver, as shown in Fig. 2 and Fig. 9, sliver 8 is Long Circle thin plate, and long is 52mm, and wide is 3mm, and thick is 1.5mm; Sliver 8 is placed in the narrow groove 23 of slide rail 2 and cover plate 4, and sliver 8 is fixed, for carrying out spacing to balladeur train 3 with balladeur train 3.
Figure 10 shows that the schematic diagram of spring-loaded plunger, as shown in Figure 9, spring-loaded plunger 9 is outside screw type spring-loaded plunger, and plunger 9 head is spherical, and plunger 9 external thread diameter is identical with the screwed hole diameter of lower wall on slide rail 2, is 4mm, and plunger 9 length is 9mm.Spring 10 nominal diameter is 4mm, is 3.5mm by the shortest length compressed, and drift is 10mm.Releasing screw 11 diameter is not 3mm, and long is 12mm, and screw is placed in the screwed hole of wedge 6 through the screwed hole of cover plate 4 and spring 10.The specification of screw 12 is M4 × 10mm, and four screws 12 are placed in the screwed hole of slide rail 2 and the through hole of cover plate 4, makes slide rail 2 and cover plate 4 fastening, forms cavity in the middle of cover plate 4 and slide rail 2, and the coboundary of slide rail 2 and cover plate 4, left side wall, right side wall are concordant.
For a preferred embodiment, with reference to figure 2, slide rail 2 is long is 60mm, and wide is 44mm, and height is 11.5mm, and each breach 21 is wide is 20mm, and the aperture of each screwed hole 22 is M3, and hole depth is 6mm; Slide rail 2 intracavity space is grown for 54mm, and wide is 32mm, is 7mm deeply, and inner chamber has longitudinal direction symmetrical and the square groove that length is equal with cavity length, wherein, two place's sipes 27 are near inwall, and wide is 7mm, is 1.5mm deeply, the two narrow grooves 23 in place are near center, and wide is 3mm, is 0.5mm deeply; The indentation, there of slide rail 2 has two director's round boss of lateral symmetry, and long is 7.5mm, and wide is 5mm, and height is 6mm; There are 4 tapped through holes in the direction of the upper lower wall of vertical slide rail 2, and aperture is M4; Slide rail 2 surrounding has 4 mounting ears, and has tapped through hole, and aperture is M4, and the horizontal spacing in hole is 66mm, and longitudinal pitch is 38mm.
For a preferred embodiment, with reference to figure 2 and Fig. 4, balladeur train 3 is strip, and long is 124mm, and wide is 18mm, thick 6mm, has two place's guide grooves in the middle part of balladeur train, and guide groove is long is 49mm, and wide is 8mm, and right side guide groove left end has inclined-plane, and chamfer dimesion is 3.5mm × 45 °; The low order end of balladeur train 3 has the pin-and-hole installing hinge 1, and aperture is 4.5mm; Two guide grooves of balladeur train 3 are each passed through two boss of slide rail 2, can horizontally slip along the breach of slide rail 2.The length and width of cover plate 4 is equal with slide rail 2, and thickness is 5.5, and thickness direction has boss, and boss height is 5.5mm, and all there is through hole at four angles of cover plate 4, and four through holes are identical with the position of the screwed hole of slide rail 2 four jiaos, and aperture is 3.5mm; Have the two narrow grooves in place inside cover plate 4, the size of narrow groove and position identical with the narrow groove inside slide rail 2; Cover plate 4 boss right-hand member has stepped hole, is divided into three sections, and outermost is screwed hole, and screwed hole diameter is 3mm, and length is 1.5mm, and centre is circular hole, and diameter is 5mm, and length is 3.5mm, and inner side be square hole, and long is 9mm, and wide is 8mm.Press strip 5 is rectangular structure, and the length of press strip 5 is 54mm, and wide is 6mm, and thick is 8mm; Width along press strip 5 has a plane of sinking, and the degree of depth of sinking is 1mm, and plane is long is 54mm, and wide is 6.5mm, perpendicular to uniform 3 oval-shaped slot of thickness direction in plane, and the center to center distance plane 1mm of circle, radius is 2.3mm; Press strip 5 is placed in the cavity that the sipes of slide rail 2 and cover plate 4 are formed.Wedge 6 is the bevelled cuboid in side, and length and width is 7.6mm, and height is 6mm, and chamfer is 4mm × 50 °, and there is screwed hole at wedge 6 center, and the diameter of thread is 3mm, is 5mm deeply.Roller bearing 7 is cylindrical, and diameter is 4.5mm, and length is 6.5mm, and roller bearing 7 is placed in the oval-shaped slot of press strip 5, and surface contact upper and lower with balladeur train.Sliver 8 is Long Circle thin plate, and long is 52mm, and wide is 3mm, and thick is 1.5mm; Sliver 8 is placed in the narrow groove of slide rail 2 and cover plate 4.Spring-loaded plunger 9 is outside screw type spring-loaded plunger, and plunger 9 head is spherical, and plunger 9 external thread diameter is identical with the screwed hole diameter of lower wall on slide rail 2, is 4mm, and plunger 9 length is 9mm.Spring 10 nominal diameter is 4mm, is 3.5mm by the shortest length compressed, and drift is 10mm.Releasing screw 11 diameter is not 3mm, and long is 12mm, and screw is placed in the screwed hole of wedge 6 through the screwed hole of cover plate 4 and spring 10.The specification of screw 12 is M4 × 10mm, and four screws 12 are placed in the screwed hole of slide rail 2 and the through hole of cover plate 4, makes slide rail 2 and cover plate 4 fastening, forms cavity in the middle of cover plate 4 and slide rail 2, and the coboundary of slide rail 2 and cover plate 4, left side wall, right side wall are concordant.
For a preferred embodiment, with reference to figure 2 and Fig. 3, slidably during built-in hinge work, the cavity that hinge 1 can drive balladeur train 3 to be formed along slide rail 2 and cover plate 4 moves; Four spring-loaded plungers 9 screw in slide rail 2 by the screwed hole of the upper and lower wall of slide rail 2, ensure that balladeur train 3 can smooth-goingly slide by regulating spring plunger 9 screw-in depth; Wedge 6 stretches in the cavity of slide rail 2 and cover plate 4 under the effect of spring 10, be retracted in the process of distalmost end at hinge 1, the inclined-plane of wedge 6 can contact with the inclined-plane of balladeur train 3 and inclined-plane along balladeur train 3 slides, Compress Spring 10 sinks in the square opening of cover plate 4 simultaneously, after the inclined-plane of balladeur train 3 is by wedge 6, wedge 6 returns to original position, by balladeur train 3 oppositely stop; Hinge 1 promotes balladeur train 3 when returning, and first releasing screw 11 and wedge 6 will not lift, and makes balladeur train 3 by wedge 6 and slide into the most inboard, making hinge 1 can be hidden in door or panel; The through hole of the screwed hole that slide rail is 2 four jiaos and hinge 1 will be for being slidably fixed on other devices by built-in hinge.
With reference to figure 1-10, slidably during built-in hinge work, the cavity that hinge 1 can drive balladeur train 3 to be formed along slide rail 2 and cover plate 4 moves; Four spring-loaded plungers 9 screw in slide rail 2 by the screwed hole of the upper and lower wall of slide rail 2, ensure that balladeur train 3 can smooth-goingly slide by regulating spring plunger 9 screw-in depth; Wedge 6 stretches in the cavity of slide rail 2 and cover plate 4 under the effect of spring 10, be retracted in the process of distalmost end at hinge 1, the inclined-plane of wedge 6 can contact with the inclined-plane of balladeur train 3 and inclined-plane along balladeur train 3 slides, Compress Spring 10 sinks in the square opening of cover plate 4 simultaneously, after the inclined-plane of balladeur train 3 is by wedge 6, wedge 6 returns to original position, by balladeur train 3 oppositely stop; Hinge 1 promotes balladeur train 3 when returning, and first releasing screw and wedge 6 will not lift, and makes balladeur train 3 by wedge 6 and slide into the most inboard, making hinge 1 can be hidden in door or panel; The through hole of the screwed hole that slide rail is 2 four jiaos and hinge 1 will be for being slidably fixed on other devices by built-in hinge.
To sum up, hinge combines with slide rail by the present invention, can be arranged on movable end by the door of equipment by hinge, avoids the interference of component on door and fixed end component; During unlatching, first outwards extract door out a segment distance, then rotating opening door, and by wedge and spring, the door opened is carried out reverse stop, avoid dodge gate and be closed under fortuitous event, improve the reliability of equipment; When door is closed, hinge is hidden into device interior, and gap is very little, can not affect the attractive in appearance of equipment profile.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvement and distortion, these improve and distortion also should be considered as protection scope of the present invention.

Claims (6)

1. a slidably built-in hinge, is characterized in that, comprising: hinge, slide rail, balladeur train, cover plate, wedge, spring and not releasing screw;
Wherein, hinge is arranged on one end of balladeur train; This slide rail is the box body with horizontal cut, and the indentation, there of slide rail has the boss of lateral symmetry, balladeur train to have two guide grooves, is each passed through two boss of slide rail, can horizontally slips along the breach of slide rail, and spacing by boss; Cover plate and slide rail are fixed, and to hide slide rail, cover plate has stepped hole, releasing screw is not arranged in stepped hole, and spring housing is located at not on releasing screw, and wedge and spring and not releasing screw are connected, and be fastened on inside stepped hole, and can move back and forth along the elastic force direction of spring; Releasing screw can not move in stepped hole, by this wedge Compress Spring, and flicks wedge by spring; Connecting portion between two guide grooves of balladeur train has an inclined-plane, mates with the inclined-plane of wedge; This wedge can be compressed by the inclined-plane of balladeur train, and the another side of connecting portion between two guide grooves being fastened on balladeur train.
2. slidably built-in hinge as claimed in claim 1, it is characterized in that, this stepped hole is divided into three sections, and outermost is screwed hole, is middlely used for arranging and limit spring for circular hole, and be square hole, this square hole mates with wedge.
3. slidably built-in hinge as claimed in claim 1, is characterized in that, the orthogonal box body of this slide rail, and inner chamber has the longitudinally symmetrical and square groove that length is equal with cavity length, is respectively the narrow groove of two place's sipes and close center two place near inwall.
4. slidably built-in hinge as claimed in claim 3, is characterized in that, also comprise:
Press strip, is placed in the cavity formed between the sipes of this slide rail and cover plate, and press strip sidepiece has multiple oval-shaped slot;
Multiple roller bearing, is arranged in this oval-shaped slot, and with the upper and lower surface contact of this balladeur train.
5. slidably built-in hinge as claimed in claim 3, is characterized in that, also comprise: sliver, fix with this balladeur train, be placed in the narrow groove of this slide rail.
6. slidably built-in hinge as claimed in claim 1, it is characterized in that, also comprise: multiple spring-loaded plunger, this resilient plunger head is spherical, through the sidewall of this slide rail, is symmetrical arranged, and this resilient plunger head contacts with this balladeur train.
CN201510531375.5A 2015-08-26 2015-08-26 Slidable built-in hinge Active CN105155953B (en)

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CN105155953B CN105155953B (en) 2017-09-19

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112428755A (en) * 2020-11-26 2021-03-02 浙江东腾智能装备有限公司 Magnetic attraction type pulling device for platform trailer

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Publication number Priority date Publication date Assignee Title
CN2591181Y (en) * 2002-12-04 2003-12-10 振躍有限公司 Sliding rail structure
US20050241106A1 (en) * 2002-11-18 2005-11-03 Sosa Saul S Adjustable gate hinge having stamped metal pivot components
CN201339403Y (en) * 2008-09-08 2009-11-04 官兴华 Omnibearing movable door
CN201416325Y (en) * 2009-06-10 2010-03-03 振跃精密滑轨股份有限公司 Hinge sliding rail with damping function
EP2517912A2 (en) * 2011-04-26 2012-10-31 Nissan Motor Manufacturing (UK) Ltd. Improvements in or relating to doors
EP1633588B1 (en) * 2003-05-30 2012-11-07 Wilhelm Karmann GmbH Device for selectively moving a tailgate of a vehicle from a closed position into a receiving position and a loading position
CN203285216U (en) * 2013-04-15 2013-11-13 许姜德 Double-pipe damping anti-bouncing cupboard upper wheel
CN203684879U (en) * 2013-07-17 2014-07-02 龙海和宾日用品有限公司 Positioning self-sliding closing door shaft and cabinet comprising same

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050241106A1 (en) * 2002-11-18 2005-11-03 Sosa Saul S Adjustable gate hinge having stamped metal pivot components
CN2591181Y (en) * 2002-12-04 2003-12-10 振躍有限公司 Sliding rail structure
EP1633588B1 (en) * 2003-05-30 2012-11-07 Wilhelm Karmann GmbH Device for selectively moving a tailgate of a vehicle from a closed position into a receiving position and a loading position
CN201339403Y (en) * 2008-09-08 2009-11-04 官兴华 Omnibearing movable door
CN201416325Y (en) * 2009-06-10 2010-03-03 振跃精密滑轨股份有限公司 Hinge sliding rail with damping function
EP2517912A2 (en) * 2011-04-26 2012-10-31 Nissan Motor Manufacturing (UK) Ltd. Improvements in or relating to doors
CN203285216U (en) * 2013-04-15 2013-11-13 许姜德 Double-pipe damping anti-bouncing cupboard upper wheel
CN203684879U (en) * 2013-07-17 2014-07-02 龙海和宾日用品有限公司 Positioning self-sliding closing door shaft and cabinet comprising same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112428755A (en) * 2020-11-26 2021-03-02 浙江东腾智能装备有限公司 Magnetic attraction type pulling device for platform trailer

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