EP2700553B1 - Passage with a bridge and a tunnel-shaped enveloping bellows between two vehicles joined through an articulated connection - Google Patents

Description

The invention relates to a transition with a bridge and a tunnel-shaped circumferential bellows between two interconnected by an articulated vehicle, the bridge comprising a tread plate and two floor panels, each floor panel in the region of the front side of a vehicle communicating with the vehicle, wherein the tread plate rests on the bottom plates, wherein for centering the tread plate relative to the bottom plates in Seen in the direction of passage on the underside of the bridge at least one centering is provided, wherein the at least one centering on the one hand with the tread plate and on the other hand with the respective vehicle is in communication, between the at least one centering member and the respective vehicle, a first and a second connection means is provided wherein the first and the second connecting means are formed such that the at least one centering member from the region of the bellows base can be brought, wherein the first connecting means comprises a first pivot joint, wherein the first pivot joint is in communication with the one vehicle, the other second connection means provides a releasable connection with the other vehicle.

Bridges of the type mentioned are known. Thus, in particular link bridges are known, which are used in short coupled vehicles with central buffer coupling. The use of link bridges in such short-coupled vehicles with central buffer coupling takes place insofar as sets in these vehicles when driving through curves, a relatively high transverse offset. Link bridges, as for example from the EP 0331121 A2 are known, are in principle able to meet the requirements for the transverse offset when passing through curves. Other embodiments of link bridges are for example from the EP 0669243B1 , of the EP 0958981 B1 and also from the EP 0722873 B1 known.

In addition, bridge constructions are known, consisting essentially of a so-called tread plate, which rests laterally on a respective bottom plate, wherein the two bottom plates are each hinged to a vehicle part. In order to prevent lifting of the tread plate of the floor panels, devices are disposed under the tread plate, which engage under the bottom plate. A bridge of the type described above is for example from the EP 2157006 A1 known or even from the EP 1564101 B1 , Such bridges are used so far for vehicles that have bogies, for example, so-called Jakobs bogies. In a multi-unit vehicle in which the individual vehicle parts rest on such Jakobs bogies, occurs essentially no cross-offset when driving through curves.

In this context is from the US 6,443,070 B1 a bridge of a transition between two articulated vehicles is known in which a tread plate is provided which rests on two floor panels, wherein each floor panel is disposed on a vehicle part. To control the movement of the tread plate relative to the floor panels when driving through curves, a scissor rack is provided under the bridge on both sides of the central longitudinal axis of the bridge. The scissor frame is connected on the one hand in the region of the bottom plates with the respective vehicle part and on the other hand, centered with the footboard. The connection of the respective scissors-type frame with the footboard is obviously carried out by at least one floating bearing. In this respect, this design is capable of briefly coupled vehicles z. B. to be used with a central buffer coupling, so in vehicles in which when driving through curves, a relatively large transverse offset between the tread plate on the one hand and the bottom plates on the other hand occurs.

From the DE 966430 C a transition bridge for coupled railroad cars is known, which rests freely on the car ends and which is held by a support with the Wagenmittelbufferkupplung in its central position between the two car ends.

The JP 2007022213 A also shows a transition bridge for two articulated carriages of a rail vehicle, comprising two floor panels which are articulated articulated to the respective car. On the bottom plates supports a tread plate, wherein the tread plate is held centered by two parallel scissor racks centered between the bottom plates. The scissor racks are received on the underside of the bottom plates by a carrier.

From the EP 24 57 796 A1 For example, there is known a bridge of a transition between two vehicles interconnected by an articulated connection, the bridge comprising a tread plate and two bottom plates. The articulated connection is in this case designed in particular as a central buffer coupling. Each base plate is in the region of the front of the vehicle with the vehicle in conjunction. Between the two floor panels, which are arranged on the vehicle, there is a footboard, which rests on the floor panels. For centering the tread plate relative to the bottom plates seen in the passage direction during the travel movement, at least one centering member is provided on the underside of the bridge. This one centering is on the one hand with the tread plate and on the other hand with the respective vehicle in conjunction, so that the tread plate is always centered centered between the two vehicles on the two floor panels.

The transition includes a bellows next to the bridge. The bellows may be formed tunnel-shaped circumferential between the articulated connection on the one hand and the bridge on the other hand, but it may also include the articulated connection, in particular a central buffer coupling. The space below the bridge, which, as already stated, is formed by the tread plate and the two bottom plates, is not hermetically sealed by the bridge. Especially in winter, dirt, salt, grit and the like accumulates in the bottom area of the bellows. In addition, there is often water on the bottom of the bellows or even ice in winter.

It is therefore necessary that the bellows bottom is cleaned at certain intervals in order to obtain the life of the bellows as a whole, as well as to allow access to the clutch for maintenance purposes.

Insofar is already out of the aforementioned EP 24 57 796 A1 Known to remove the tread to order with the tread plate and swiveled floor panels to clean the bellows floor from the inside. However, located below the tread plate and and the two bottom plates, the two parallel to the longitudinal axis of the vehicle extending centering members, in the case of the aforementioned EP 24 57 796 are designed as double scissors. These scissors prevent easy access to the bellows bottom.

The object underlying the invention is therefore to ensure at a bridge of a transition between two interconnected by an articulated connection vehicles of the type mentioned in that the bottom of the bellows is to clean without restrictions and the clutch is optionally accessible.

The solution of the problem is inventively characterized in that after releasing the second connection means, the complete bridge including the at least one centering member is pivotally upwards in the direction of the bellows roof, so that the bellows bottom is accessible from the inside. The bridge is then almost perpendicular or inclined in the direction of the vehicle, so then from the other side, that is accessible from the other vehicle ago the bellows bottom from the inside. If on both sides of the central longitudinal axis of the vehicle, in each case such a centering member is provided, which is designed in particular as a scissors-type frame and in particular as a pair of scissors, both centering members should be able to be brought together from the region of the bellows base.

Advantageous features and embodiments of the invention can be found in the dependent claims.

In detail, it is provided in this connection that the first connection device comprises a first carrier arranged on the first base plate, which receives the one end of the at least one centering element. In this case, preferably, a first carrier in the horizontal position of the at least one centering member is mounted on a first traverse arranged on the vehicle, wherein the traverse through the

Swivel joint can be connected to the vehicle. That is, the connecting device comprises both the carrier and the cross member, but the traverse forms the bearing point for the carrier. Here, the bottom plate is pivotally mounted on the first pivot joint. The first pivot joint itself is located on the vehicle, in particular in the region of the front side of the car body of the vehicle.

For releasably connecting the at least one centering member to the vehicle, the second base plate has a second carrier for receiving the at least one second end of the at least one centering member. The second bracket communicates with the second floor panel through a second pivot joint, the second pivot joint further showing an overlap panel to the floor of the vehicle. The second carrier rests on a arranged on the corresponding second vehicle second crossmember, which is arranged on the end face of this second vehicle. In order to prevent that this detachable, aufschwenkbare end of the bridge moves in the vertical direction while driving, the second carrier is releasably connected by a locking device with the second vehicle. The locking device has a finger which can be disengaged from an opening arranged on the carrier. Specifically, it is provided in this context that at the respective lateral end of the carrier, a wall is provided which has a corresponding opening for the finger. The finger itself is
mounted in a bearing block, wherein the bearing block is fixed to the front side of the vehicle. The axial displaceability of the finger can be carried out by, for example, pivoting a lever via a rotatable square, wherein the one end of the finger is articulated on the lever in an articulated manner. Preferably, in this case, the finger is under the load of a spring, so that while driving, that is, in the position of use of the bridge, the finger is kept pressed by the spring in the opening. This type of locking is advantageously provided on both sides of the bridge, that is to say with respect to the support on each side of the bridge, so that to remove the tread plate with the centering members, the locking devices on each side of the bridge must be released.

Both at the end of the bridge, where a detachable from the corresponding vehicle connection is provided, as well as at the end of the bridge on which the bridge is pivotally mounted, the bottom plates are held by a respective pivot joint, said pivot joint and the pivot joint for Swing up the bridge can form. This has the consequence that the bottom plates are swung open. The tread plate is preferably releasably connected to the at least one centering, so that after removing the foot plate, the bottom plates are swung open and the floor space of the bellows so far, although limited, because of the centering, but still accessible.

Fig. 1

zeigt die Brücke als Teil eines Übergangs zwischen zwei Fahrzeugteilen in perspektivischer Darstellung in einer Ansicht von oben;

Fig. 2

zeigt eine Ansicht gemäß Figur 1 von unten auf die Brücke;

Fig. 3

zeigt die Anbindung der Trittplatte an das Scherengestell;

Fig. 3a

zeigt einen Schnitt gemäß der Linie III a - III a aus Figur 3, wobei die Trittplatte der besseren Übersicht wegen weggelassen wurde;

Fig. 3b

zeigt die Kupplung gemäß Figur 3 in perspektivischer Darstellung;

Fig. 4

zeigt eine Schnittdarstellung gemäß der Linie IV - IV aus Figur 2;

Fig. 5

zeigt das sphärische Lager zur Anbindung des Scherengestells an dem Fahrzeugteil;

Fig. 6

zeigt die erste Verbindungseinrichtung zur schwenkbaren Verbindung der Brücke mit dem Fahrzeug;

Fig. 7

zeigt die zweite Verbindungseinrichtung zur lösbaren Verbindung mit dem Fahrzeug;

Fig. 8

zeigt die Riegeleinrichtung bei der zweiten lösbaren Verbindungseinrichtung in einer Ansicht von oben.

With reference to the drawings, the invention will be explained in more detail below by way of example.

Fig. 1

shows the bridge as part of a transition between two vehicle parts in a perspective view in a view from above;

Fig. 2

shows a view according to FIG. 1 from below onto the bridge;

Fig. 3

shows the connection of the tread plate to the scissor frame;

Fig. 3a

shows a section along the line III a - III a FIG. 3 with the tread plate omitted for the sake of clarity;

Fig. 3b

shows the clutch according to FIG. 3 in perspective view;

Fig. 4

shows a sectional view along the line IV - IV FIG. 2 ;

Fig. 5

shows the spherical bearing for connection of the scissors-type frame to the vehicle part;

Fig. 6

shows the first connecting means for pivotally connecting the bridge to the vehicle;

Fig. 7

shows the second connection means for releasably connecting to the vehicle;

Fig. 8

shows the locking device in the second releasable connection device in a view from above.

As shown FIG. 1 the bridge has the reference numeral 1 as a whole. The bridge 1 connects the two vehicles 2, 3, the bridge comprising the two base plates 4, 5, on which the foot plate designated 6 supports. The bridge is surrounded by the schematically arranged between the vehicles bellows 1 a. The bellows 1 a forms with the bridge 1 the transition. That's the two vehicles connecting joint has been omitted for the sake of clarity. The bottom plate 4 is connected to the bottom 2 a of the vehicle body 2 by a pivot joint 4 a in the form of a hinge. The bottom plate 5 also shows a pivot joint 5a in the form of a hinge which communicates with an overlap plate 7 with the bottom 3a of the car body of the vehicle 3. That is, the overlapping plate forms the transition to the bottom 3a of the car body of the vehicle 3. This means that the bottom plates 4, 5 can be swung open after lifting the tread plate.

The details of the structural design of the bridge are now in intuition FIG. 2 , In particular, it can be seen that on both sides of the central longitudinal axis 8 in each case a scissors-type frame 10 is arranged as a centering element for the tread plate 6 between the two vehicles 2, 3. The scissors-type frame 10 comprises scissor arms 13, 14, 15 as double scissors, wherein at the point of intersection 12 of the two scissor arms 13, 14 the connection between the scissor frame 10 on the one hand and the step plate 6 on the other hand is effected by the coupling device 20. As already stated, each of the two scissor racks 10 in the region of the respective crossing point 12 is connected to the tread plate 6 by the coupling device 20.

The coupling device 20 is described in detail in the FIG. 3 and also in the FIGS. 3a . 3b shown. In the following, the connection of the tread plate to the scissor frame will first be shown as a detachable bearing (floating bearing). The tread plate 6 has on its underside on a support plate 6a, wherein on the support plate 6a, two guide rails 23, 24 are arranged. The guide rails 23, 24 each have a slot 23 a, 24 a, wherein between the two guide rails 23, 24 as this continues to be in the view of FIG. 3a results, the carriage 22 is provided, which has two guide pins 25, wherein by means of the guide pins 25, which protrude on both sides of the carriage and in the slot 23a, 24a are guided, a displacement of the carriage 22 in the direction of the arrow 26 is made possible, which means that this connection of the tread plate is formed on the scissors frame as a floating bearing. The carrier plate 6a, the guide rails 23, 24 and the carriage 22 form the carrier 21st

The arranged on the opposite scissors frame coupling device may be formed as a fixed bearing, which means that the mobility of the carriage 22 is prevented in the direction of the double arrow 26.

The carriage 22 as part of the carrier 21 has on its underside the locking member 27. The locking member 27, which is fixedly connected to the carriage 22, has on its circumference a circumferential groove 27 a. The groove 27a is part of the latching device 28, comprising a latching tooth 29, a spring 30 and a pull cable 31. The latching device is mounted in the head bolt 33, which is in communication with the scissor rack. In the circumferential groove 27a engages the designated notch tooth 29, as this is in the view of FIG. 3 results. The latching tooth 29 is under the load of the spring 30, wherein the latching tooth 29 is also in communication with the pull cable 31 that through the corresponding openings 6 b (FIG. Fig. 2 ) is guided in the lateral edge region of the tread plate 6 upwards to disengage the locking tooth 29 against the force of the spring 30 from the circumferential groove 27 a. The latching tooth 29 is mounted in a sleeve 29 a, which is firmly connected to the scissors frame. That is, move the scissor arms 13, 14 due to a movement of the scissors-type frame 10, then the locking tooth 29 rotates relative to the locking member 27 in the circumferential groove 27 a. In the starting position, that is, when standing in a line vehicle, it is, however, so that the locking tooth 29 extends in its longitudinal direction transverse to the longitudinal axis of the vehicle, that is, that the traction cable 31 does not engage at an angle to the locking tooth.

The scissors-type frame 10 is articulated on the spherical bearing 11 (FIG. Fig. 5 Each of these scissor arms is a spring element 40 is arranged as a support element, the end has a head 41, wherein the head 41 made of a plastic resiliently against the respective bottom plate 4, 5, is pressed. Thus, if the bottom plate 4, 5 under the load of the spring elements 40, then this is the bottom plate 4, 5, since it is connected by the hinge 4a, 5a with the vehicle part, held pressed against the footboard. This with the result that due to the elastically yielding design of the tread plate itself, for example by the use of a PU material, the step formation between the bottom plates on the one hand and the tread plate on the other hand is prevented. From this it is clear that in extreme roll, pitch and kink movements possibly also with transverse offset of the vehicles, by the pressure of the bottom plate against the tread plate, the tread plate is deformed in the installed state upwards and thus biased in the vertical direction. The support member may also be a buck, z. B. plastic.

Out FIG. 4 is also the connection of the scissors-type frame 10 to the vehicle 2, 3 recognizable, wherein the FIG. 5 an enlarged view of the detail V from FIG. 4 shows. This in FIG. 5 shown spherical bearing 11 comprises a bearing pin 11 a with a spherical collar 11 b on which a likewise spherically formed saddle 11 c rests, which is in communication with the scissor arm 15, 14. Such spherical bearings are state of the art, and so a detailed description of this bearing is unnecessary.

Out Fig. 6 In detail, the pivotable connection of the bridge 1 to the car body of the vehicle 2 by the first connection means 53. In this case, a pivot joint 4a is provided in the form of a hinge or hinge strip, for example, in the region of the bottom 2a of the car body of the vehicle 2 is attached by a weld. Bridge side takes the pivot joint 4 a, the bottom plate 4 pivotally. Approximately at right angles to the bottom plate 4, the first cross member 50 extends. The Traverse is hereby arranged directly on the car body. It can also be additionally attached to the pivot joint 4a. This first cross member 50 is formed at right angles in the cross section in the manner of an "L". In the direction of the bridge 1, a likewise right-angled, L-shaped first carrier 51 is arranged on the bottom plate immediately in front of the pivot joint 4 a, which runs approximately parallel to the also right-angled cross member 50. The first carrier 51 serves to receive the spherical bearing 11. The first carrier 51 is supported relative to the cross member 50 via plastic buffer 55 both laterally and downwardly, as shown directly in the view of FIG Fig. 6 results.

Looking now at the Fig. 7 , the following results with respect to the second connecting device 63: The car body of the vehicle 3 receives the second cross member 60. The second cross member 60 is formed in cross section as well as the first cross member substantially rectangular (L-shaped). This second cross member 60 is attached to the end wall of the vehicle 3, as is shown in the view of Fig. 7 results. Furthermore, a pivot joint 5a is provided, wherein the pivot joint 5a on the bridge side receives the bottom plate 5. Running at the opposite end in an alignment with the base plate 5, there is the so-called overlap plate 7 on the pivot joint 5a. The overlap plate 7 rests on the floor 3a of the car body of the vehicle 3. Running at right angles to the bottom plate 5, the joint also has the also in cross section rectangular, L-shaped second carrier 61, wherein the carrier 61, the spherical bearing 11 of the scissors frame 10 absorbs. Also, the carrier 61 is supported on plastic buffer 65 both laterally and vertically on the second cross member 60 from.

As can be seen, the second carrier is mounted on the horizontal leg of the second cross-member 60. That is, when driving the vehicle, there is the possibility, especially on uneven road, that the bridge lifts unintentionally. This means that the overlap plate or the entire bridge in the region of the second cross member pivots vertically upwards. To prevent this, a locking device 70 is provided ( Fig. 8 ). This locking device 70 comprises a finger 71, which is connected by a lever 72 with a rotatable square 73, wherein the lever is pivotally mounted on the finger 71. By pivoting the lever 72 is pivoted in the clockwise direction by turning the square 73 of the fingers 71 from an opening 67, wherein the opening 67 is located in a vertical wall 68 on the horizontal leg of the second carrier. This wall 68 is arranged at the end of the carrier, so that the locking device 70 is fixed by the bearing block 69 for receiving the square 73 on the front side of the car body of the vehicle 3. The finger 71 is under the load of a spring 71 a, which ensures that the finger is always in the opening 67.

There is the possibility of the formation of the second connection means 63 according to the FIGS. 7 and 8th provided to both ends of the bridge, so that then after releasing the fingers 71 of the locking devices 70, the complete bridge including the centering, that is, the scissor racks and the bottom plates, can be removed. It is also conceivable to show the locking device on both sides of the bridge.

However, the connection of the bridge is taken in the form as they are in the FIGS. 6 on the one hand and 7 and 8 on the other hand, so only the finger 71 of the locking device 70 is released at the first end of the bridge to then pivot the entire bridge including the overlap plate 7 in the direction of the bellows roof, and thus free access to get to the bellows bottom, since, as stated, the centering members so in the present case, the two scissor racks are swung with.

LIST OF REFERENCE NUMBERS

1

bridge

1a

bellows

2

vehicle

2a

Floor of the vehicle 2

3

vehicle

3a

Floor of the vehicle 3

4

baseplate

4a

Swivel joint (hinge)

5

baseplate

5a

Swivel joint (hinge)

6

footboard

6a

support plate

6b

Opening in the footboard

7

splice plate

8th

central longitudinal axis

10

Scissor frame (centering element)

11

spherical bearing

11a

bolt

11b

spherical collar

11c

spherical saddle

12

intersection

13

Scherenarm

14

Scherenarm

15

Scherenarm

20

coupling device

21

carrier

22

carriage

23

guide rail

23a

Long hole

24

guide rail

24a

Long hole

25

guide pin

26

double arrow

27

locking member

27a

circumferential groove in the locking member

28

locking device

29

ratchet

29a

Sleeve for locking tooth

30

Spring of the ratchet tooth

31

rope

33

studs

40

Support element (spring element)

41

Head of the spring element

50

first traverse

51

first carrier

53

first connecting device (pivotable)

55

Plastic buffer

60

second traverse

61

second carrier

63

second connection device (detachable)

65

Plastic buffer

67

Opening in wall

68

Wall on second support

69

bearing block

70

locking device

71

finger

71a

feather

72

lever

73

square

Claims (14)

1. A gangway with a bridge and a tunnel-shaped circumferential bellows between two cars (2, 3) connected to each other by way of an articulated connection, wherein the bridge (1) comprises a tread plate (6) and two floor plates (4, 5), wherein each floor plate is connected to the car in the area of the front side of a car, wherein the tread plate (6) rests on the floor plates (4, 5), wherein at least one centering member (10) is provided on the underside of the bridge (1), as seen in the direction of passage, for centering the tread plate relative to the floor plates (4, 5), wherein the at least one centering member (10) is connected on the one hand with the tread plate (6) and on the other hand with the respective car (2, 3), wherein a first and a second connection arrangement (53, 63) is provided between the at least one centering member (10) and the respective car (2, 3), wherein the first and the second connection arrangement (53, 63) are designed in such a manner that the at least one centering member (10) is adapted to be brought out of the area of the bellows floor,
   wherein the one first connection arrangement (53) comprises a first pivot joint (4a), wherein the first pivot joint (4a) is connected with the one car (2), wherein the other second connection arrangement (63) provides a detachable connection with the other car (3),
   characterized in that
   after releasing the second connection arrangement (63) the entire bridge (1) including the at least one centering member (10) is pivotable upwards in the direction of the bellows roof, so that the bellows floor is accessible from the inside.
2. The gangway with a bridge and a tunnel-shaped circumferential bellows between two cars (2, 3) connected to each other by way of an articulated connection according to claim 1,
   characterized in that
   the bridge (1) is connected at both ends with the respective car (2, 3) by a respectively detachable connection arrangement (63).
3. The gangway with a bridge and a tunnel-shaped circumferential bellows between two cars (2, 3) connected to each other by way of an articulated connection according to one of the afore-mentioned claims,
   characterized in that
   the first connection arrangement (53) comprises a first support (51) disposed on the first floor plate (4), said support receiving the first end of the at least one centering member (10).
4. The gangway with a bridge and a tunnel-shaped circumferential bellows between two cars (2, 3) connected to each other by way of an articulated connection according to claim 3,
   characterized in that
   in the horizontal position of the at least one centering member (10), the one first support (51) is mounted on a first cross-beam (50) disposed on the car (2).
5. The gangway with a bridge and a tunnel-shaped circumferential bellows between two cars (2, 3) connected to each other by way of an articulated connection according to one of the afore-mentioned claims,
   characterized in that
   the floor plate (4) is pivotably disposed on the first pivot joint (4a).
6. The gangway with a bridge and a tunnel-shaped circumferential bellows between two cars (2, 3) connected to each other by way of an articulated connection according to one of the afore-mentioned claims,
   characterized in that
   the second connection arrangement (63) is provided for a detachable connection of the at least one centering member (10) from the car (3), and a second floor plate (5) has a second support for receiving the one end of the at least one centering member.
7. The gangway with a bridge and a tunnel-shaped circumferential bellows between two cars (2, 3) connected to each other by way of an articulated connection according to claim 6,
   characterized in that
   the second support (61) is detachably connected to a second cross-beam (60).
8. The gangway with a bridge and a tunnel-shaped circumferential bellows between two cars (2, 3) connected to each other by way of an articulated connection according to claim 6 or 7,
   characterized in that
   the second support (61) is connected with the second floor plate (5) by a second pivot joint (5a).
9. The gangway with a bridge and a tunnel-shaped circumferential bellows between two cars (2, 3) connected to each other by way of an articulated connection according to claim 8,
   characterized in that
   the second pivot joint (5a) has an overlapping plate (7) for connecting it with the floor (3a) of the car (3).
10. The gangway with a bridge and a tunnel-shaped circumferential bellows between two cars (2, 3) connected to each other by way of an articulated connection according to one of the claims 7 to 9,
    characterized in that
    the second support (61) is mounted on the second cross-beam (60) disposed on the car (3).
11. The gangway with a bridge and a tunnel-shaped circumferential bellows between two cars (2, 3) connected to each other by way of an articulated connection according to one of the claims 6 to 10,
    characterized in that
    the second support (61) is detachably connected to the second car (3) by way of a locking arrangement (70).
12. The gangway with a bridge and a tunnel-shaped circumferential bellows between two cars (2, 3) connected to each other by way of an articulated connection according to claim 11,
    characterized in that
    the locking arrangement (70) has a finger (71) that is disengageable from an aperture (67) disposed on the support (61).
13. The gangway with a bridge and a tunnel-shaped circumferential bellows between two cars (2, 3) connected to each other by way of an articulated connection according to one of the afore-mentioned claims,
    characterized in that
    respectively one centering member (10) is disposed on each side of the center longitudinal axis of the bridge (1).
14. The gangway with a bridge and a tunnel-shaped circumferential bellows between two cars (2, 3) connected to each other by way of an articulated connection according to one of the afore-mentioned claims,
    characterized in that
    the centering member (10) is configured as a scissor-type frame, more specifically as double scissors.

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