TECHNICAL FIELD

The present disclosure relates to the field of protection for cables or conduits, which are typically used in the wellbore industry for recovery of natural resources. In particular, the disclosure relates to couplings to provide said protection.

BACKGROUND

A downhole may refer to a hole drilled for the purpose of exploration or extraction of natural resources, which may include water, gas or oil. A corresponding well may be produced for extraction of said natural resource. A downhole may include a wellbore or a drill hole.

The downhole is generally drilled into the Earth with a globally vertical trajectory. Local portions of the downhole may have a non-vertical trajectory, including substantially horizontal, for example for trajectory correction or to navigate around objects. The trajectory may therefore serpentine.

A pipe may be located within a bore of the downhole, the pipe forming an extraction conduit for extraction of said natural resource between an extraction location and a transmission location. An extraction location may include an underground location. A transmission location include the surface of the ground, or a subsea surface.

The downhole may have an uneven internal surface, and may curve locally. This in turn presents difficulties in inserting and removing components, including the well pipe, from the downhole.

A well pipe is generally formed from a number of sequentially interconnected pipes. Adjacent pipes are connected by a coupling. When a well pipe is lowered into a downhole, the pipes are inserted into the downhole pipe-by-pipe. That is, a first pipe is inserted into the downhole, a coupling is used to attach said first pipe to a second pipe and so on.

Components, including electrical submersible pumps (ESP), may be inserted into the downhole and require cabling for operation thereof. Exampling cabling includes; ESP cables; control lines; umbilicals and; encapsulating bundles. A run of the cable is generally between the outer surface of the well pipe and the surface of the down hole. Said cable run may be susceptible to damage, particularly proximal the coupling, e.g. since the coupling typically protrudes outwardly from the well pipe and/or the coupling may be displaced during use of the well pipe.

Consequently, a cable protector may be implemented, inter alia, to reduce the risk of damage to said cabling proximal the coupling and/or to secure said cable generally.

A known cable protector currently marketed by Slingco ^R includes a pair of interconnected grippers. A lower gripper grips the first pipe below the coupling, and an upper gripper grips the second pipe above the coupling. A spine interconnects the first and second gripper, which spine extends contiguous an outer surface of the coupling. The spine may also extend contiguous a portion of each pipe, proximal the coupling. The spine is arranged to form a passage through which cabling can pass. Proximal the coupling, the cabling is secured within the passage, which may reduce said risk of damage.

Each gripper has an open and closed configuration. In the open configuration, the pipe is movable relative the gripper. In the closed configuration, the gripper grips the pipe by engagement with its outer surface. The gripper includes two hingedly coupled arms. Each arm includes a series of teeth, which are arranged to interdigitate in the closed position. Each tooth has a passage formed therethrough. When interdigitated, a locking member is passed through passages of the teeth of both arms to second the gripper in the closed position.

A drawback is that the locking member may be dropped during insertion/extraction from said passage. If the locking member falls down the downhole, equipment located in the downhole may be damaged. Moreover, it may be difficult to retrieve a dropped locking member from the downhole.

A drawback is that positioning the locking member for insertion in said passages may be difficult, particularly in extreme environmental conditions, which are associated with a downhole.

In spite of the effort already invested in the development of cable protection systems further improvements are desirable.

SUMMARY

The present disclosure provides a gripper. The gripper may be for a cable protector. The cable protector may be for protection of cables extending contiguous pipes. As used herein the term “contiguous” may refer to touching or in close proximity. The pipes may be of a downpipe for a wellbore. In embodiments the gripper may therefore not be limited to wellbore applications.

The gripper comprises a gripping system comprising a first member and a second member movable relative to each other to an engaged position, wherein in the engaged position a pipe is gripped by at least one of said members. The first member and a second member may be movable relative to each other to a disengaged position, wherein a pipe is not gripped by the member.

The gripper comprises a clasp fastening system. The clasp fastening system comprises an arm pivotably connected to the first member, e.g. at an end of the arm. The clasp fastening system comprises a latch pivotably connected to the arm, e.g. between ends of the arm. The arm is actuatable to an open position wherein the latch is engageable with a catch of the second member. With the arm in the open position the latch can engage the catch when the gripping system is in a disengaged position. The arm is actuatable from the open position to a closed position, e.g. with the latch and catch maintaining engagement to progressively tighten the gripping system. With the arm in the closed position, and the catch engaged by the latch, the gripping system is retained in the engaged position for engaging the pipe. As the arm is moved to the closed position the catch engaged by the latch progressively increases a gripping force on a pipe.

By implementing a clasp fastening system, fastening of the gripping system is integrated with the gripper such that it may be particularly convenient to operate compared to an equivalent fastening system which includes a removable locking member. Moreover, parts of the clasp fastening system are not susceptible to being dropped in a wellbore during assembly.

In embodiments, at least part of the arm is profiled to extend contiguous the first member in the closed position. By contiguous it is meant that the arm extends with adjacent surfaces of the first member and arm touching or in close proximity (e.g. within less than 5 mm) of the first member. With said profile of the arm, in the closed position, the clasp fastening system may be particularly compact since few components protrude. In this way it may be less susceptible to damage or to being accidentally opened due to catching on adjacent components or the surface of the wellbore. In the open position the arm extends outwardly from the first member.

In embodiments, the arm is actuatable about an axis parallel to an axis of symmetry of the pipe (which is also parallel to a gripping axis of the gripping system) when the pipe is gripped by the gripping system. By having the arm actuatable about said axis, the fastening system may be particularly compact since in the closed position the arm can extend around said axis and lie contiguous the first member.

In embodiments, the pivoted attachment of the arm to the first member includes an extension of the first member arranged adjacent two opposed extensions of the arm, the extensions pivotably linked about an axis. In embodiments, the extension of the first member extends generally along a circular arc of the first member. The extensions of the first member and the arm may be arranged to lie generally aligned each other with the arm in the closed position. With such an arrangement the fastening system may be particularly compact and may be less susceptible to damage.

In embodiments, the catch of the second member is hook shaped with an opening therefore arranged on an outer surface of the second member. By arranging the opening of the hook on the outer surface the hook may be convenient to engage with the catch. In embodiments, the catch is formed integrally with the second member. By integrating the catch with the second member the gripper may be formed cost effectively and/or with increased strength. In embodiments, the catch is formed to extend contiguous a generally circular arc of the second member. With such an arrangement the fastening system may be particularly compact and may be less susceptible to damage. In embodiments, the first and second member are pivotably connected. With such a configuration they may be moved conveniently between the engaged and disengaged position.

In embodiments, the first and/or second member includes one or more extensions arranged on an interior surface for gripping of a pipe.

In embodiments, the catch is double walled, wherein a wall (e.g. an interior wall) of the double wall forms the pivoted connection of the arm to the first member and/or the arm to the latch. The pivoted connection may be formed by bending of the interior wall to create a slot for receiving an axle. By interior wall it is meant a wall that does not form part of the exterior of the arm when in the closed position. A double wall formation may provide additional strength as well as convenient formation of slots for the pivoted connections.

In embodiments, the first member includes one or more extensions arranged on an outer surface and in operative proximity of the catch when the catch is in the close position. The said extensions may protect the arm from impact, including accidental opening of the clasp fastening system. In embodiments, the or each extension is formed integrally with the first member. By forming the extensions integrally from the first member they may be conveniently and/or cost-effectively formed. In embodiments, the extension may protrude in height to at least the same height as the arm in the closed position in respect to the exterior surface of the first member.

Disclosed herein is a cable protector. The cable protector comprising a first gripper and a second gripper, said first and/or second gripper may be according to any preceding embodiment or another embodiment disclosed herein, wherein the first and second gripper are connected by a spine.

Disclosed herein is a method of securing a gripper of a cable protector to a pipe, said method comprising: arranging first and second members around a pipe; driving, with an arm, the first and second members to an engaged position, wherein in the engaged position a pipe is gripped by at least one of said members, by actuating an arm that is connected to the first member to move a latch in engagement with a catch of the second member.

Disclosed herein is a Cable Protector hereby named Clasp Cable Protector. Said Clasp Cable Protector consisting of a Spine, at both ends of said Spine is a Clasp Cable Protector End, connected to said Clasp Cable Protector End is a Clasp, said Clasp is connected by a Clasp Pin. At both ends of said Spine is a Clasp Latch, said Clasp Latch is connected via a Clasp Latch Pin. Said Clasp Latch has a Clasp Latch Hook. Connected to said Clasp is a Clasp Lever. Said Clasp Lever has Clasp Lever Pins, said Clasp Lever Pins connect said Clasp Lever to said Clasp. During assembly said Clasp Cable Protector is located around the Well Pipe and Coupling, once the Cables are correctly located along said Spine said Clasp is pivoted allowing said Clasp Lever to be located around said Clasp Latch Hook. To fix said Clasp Cable Protector to said Well Pipe said Clasp is closed thereby constricting said Clasp Cable Protector around said Well Pipe by applying forced through Compression Pads located on said Clasp Latch and the ends of said Spine. To prevent pick up from the Well Bore on said Clasp are Anti-Snag features which are located on the Clasp Cable Protector Ends.

The preceding summary is provided for purposes of summarizing some embodiments to provide a basic understanding of aspects of the subject matter described herein. Accordingly, the above- described features are merely examples and should not be construed to narrow the scope or spirit of the subject matter described herein in any way. Moreover, the above and/or proceeding embodiments may be combined in any suitable combination to provide further embodiments. Other features, aspects, and advantages of the subject matter described herein will become apparent from the following Detailed Description, Figures, and Claims.

BRIEF DESCRIPTION OF THE FIGURES

Aspects, features and advantages of embodiments of the present disclosure will become apparent from the following description of embodiments in reference to the appended drawings in which like numerals denote like elements.

Figure 1 is a perspective view showing an embodiment cable protector and a downpipe formed of coupled pipes.

Figure 2 is a perspective view showing the cable protector of figure 1 , with a first gripper in an disengaged position and a second gripper in an engaged position.

Figure 3 is a perspective view showing a gripper of the cable protector of figure 1.

DETAILED DESCRIPTION OF EMBODIMENTS

Before describing several embodiments of a cable protection system, it is to be understood that the system is not limited to the details of construction or process steps set forth in the following description. It will be apparent to those skilled in the art having the benefit of the present disclosure that the system is capable of other embodiments and of being practiced or being carried out in various ways.

The present disclosure may be better understood in view of the following explanations:

As used herein the term“cable protector” or“clasp cable protector” may refer to a mechanical device operable to guide and/or protect a cable as defined herein contiguous a pipe as defined herein. The cable protector may be of the configuration wherein two grippers are interconnected by a spine. The cable protector may be of a single gripper configuration, which is referred to as a midjoint cable protector, wherein the cable protector includes the single gripper and a cable guide for guiding of cables. A mid-joint cable protector may be deployed mid-joint rather than over a coupling as for the dual gripper and spine implementation.

As used herein the term“cable” or“cables” may refer to an arrangement of one or more control lines for remote communication with componentry. Cable may include wires for electrical transmission as well as pneumatic and fluid lines. A cable may be generally cylindrical or alternatively shaped, such as square or elliptical or flat. A cable may have a diameter (or a longest dimension in a section for non-circular cables) of 4 mm to 50 mm.

As used herein the term“wellbore” may refer to a bore suitable for a well for extraction of natural resources, including water, gas or oil. Said bore may be formed by drilling through a surface of the Earth.

As used herein the term“pipe” may refer to a downpipe or other type of pipe, which may be adapted for use in a wellbore. A pipe may be generally cylindrical or alternatively shaped, such as square or elliptical. As used herein the term“downpipe” may refer to a pipe adapted for use in a wellbore. A downpipe may have a diameter (or a longest dimension in a section for non-circular pipes) of 5 cm to 20 cm.

As used herein the term“gripped pipe” may refer to a pipe as defined herein gripped by a gripper as defined herein. Said gripping may provide sufficient force to fix the cable protector to the pipe without movement thereof in general use. Said gripping is typically by means of friction and is nondestructive. As used herein the term“gripper” or“clamp” may refer to a system of components, e.g. a gripping system and locking member.

As used herein the term“gripping system” or“clamp” may refer to a system of components, e.g. a first and second member (or respective RHS and LHS clamps) adapted to grip a pipe as defined herein. As used herein the term“pivotably connected” may refer to any connection capable of pivoting. It may include a connection that pivots about an axle or other configurations such as flexible material to implement the same effect as said axle connection.

In the following examples, a cable protector with dual grippers interconnected by a spine is described. It will be understood that the disclosure is not limited to such a cable protector and the gripper may be suitably extended to other implementations of cable protectors, e.g. a mid-joint cable protector.

Referring to figure 1 , pipes 2 are coupled with a coupler 4. Cables 6 extend contiguous the pipes 2 and coupler and are retained by an embodiment cable protector 8. The cable protector 8 includes a first and second grippers 10, which are interconnected by a spine 11. The cable protector 8 extends generally parallel to an axis of symmetry 13 of the pipes 2.

Referring to figures 1 to 3, a gripper 10 of the cable protector may implement features of any of the preceding embodiment, or another embodiment disclosed herein.

The gripper 10 includes a gripping system 14 comprising a first member 16 and a second member 18. The first member 16 and second member 18 are movable relative to each other to an engaged position (as shown for gripper 10A in figure 2) and to a disengaged position (as shown for gripper 10B in figure 2). In the engaged position a pipe is gripped by at least one of said members 16, 18 (as shown in figure 1 ).

The gripper includes a clasp fastening system 20. The clasp fastening system 20 comprises an arm 22, which is pivotably connected at pivot 24 to the first member 16. The clasp fastening system 20 comprises a latch 26, which is pivotably connected at pivot 29 to the arm 22. The arm 22 is actuatable to an open position (as shown for gripper 10B in figure 2) wherein the latch 26 is engageable with a catch 28 of the second member 18, with the gripping system in a disengaged position. The arm 22 is actuatable from the open position to a closed position (as shown for gripper 10A in figure 2), wherein the clasp fastening system 22 retains the gripping system 14 in an engaged position for engaging the pipe 2.

With the catch 28 and latch 26 engaged, it will be understood that the arm 22 conveniently snaps to the open or closed position based on said positions applying the least force through the clasp fastening system.

In the illustrated embodiment the first member 16 and second member 18 are pivotably connected at pivot 34. In embodiments (which are not shown), the first and second members are alternatively connected, including, integrally formed, interconnected by a body, which may be formed as part of the spine.

The first member 16 includes a body 30. The second member 18 includes a body 32. Opposed ends of said body include loops for receiving an axle of the pivot 34. In embodiments (which are not shown) the pivot is alternatively implemented, e.g. by an axle integrated with one of said members.

At an end of the first member 16, distal the pivot 34, the arm 22 and latch 26 are arranged. At an end of the second member 18, distal the pivot 34, the catch 28 is arranged.

The body 32 of the first member 18 is connected to the spine 11 , said connection may include a removable connection, e.g. by bolts, or both components may be integrally formed (as shown).

Referring to figure 1 and figure 2, gripper 10, 10A illustrates the arm 22 in the closed position, wherein the arm 22 is profiled to extend contiguous the first member 16. In particular, the arm 22 and the first member 16, comprise adjacent surfaces that correspond in shape to each other, such that they may be placed touching or in close proximity (e.g. within 2 or 5 mm of each other) when the arm is in the closed position. The arm 22 and first member 18 are generally circular in shape and are arranged to extend generally about axis 13 in the closed position. In other embodiments (which are not shown) other shapes are possible, e.g. elliptical or square.

Referring to figure 2, the pivoted connection 24 of the arm 22 to the first member 16, includes an extension 36 of the first member 16 arranged adjacent two opposed extensions 38, 40 of the arm 22. The extensions 36 to 40 are pivotably linked about an axis 42 by an axle that extends through slots as will be discussed. The axis 42 is generally parallel to axis 13. In embodiments (which are not shown) the pivot is alternatively implemented, e.g. by an axle integrated with one of said members, or the first member includes a one or more extensions and the arm includes a one or more extension. In embodiments (which are not shown), the clasp fastening system may be alternatively orientated, e.g. with actuation of the arm about an axis parallel to a radii of a gripped pipe, wherein overlapping extensions on the first member connect the arm and catch respectively.

The extension 36 of the first member 16 extends generally along a circular arc of the body 30 of the first member 18. With the arm 22 in the closed position, the extensions 38, 40 extend along a circular arc, which is generally coincident that of the extension 36.

The catch 28 of the second member 18 is hook shaped with an opening therefore arranged on an outer surface of the second member 18. The catch 28 is formed integrally with the second member 18. The catch 28 is formed to at least partially extend along the same generally circular arc of the body 32 of the second member 18.

In embodiments (which are not shown) other formations are possible, e.g. L-shaped, non-integral formation.

Referring to figure 2, the latch 26 is formed of a single piece construction, generally in the form of a buckle. Lateral members 44 are generally circular in shape and are interconnected by a transverse member 46. The transverse member 46 and catch 28 are configured for removable engagement with each other. Distal the transverse member 46 the lateral members 44 are connected to opposed ends 50 that sit in corresponding slots 52 formed in the arm 22, to form the pivot 29 to the arm 22.

In embodiments (which are not shown) other configurations of the latch and pivot 29 are possible, e.g. integral axles formed on the arm and a non-integrally formed latch.

The arm 22 integrates slots of the pivots 29 and 24 by means of a single-piece folded construction. The slots 52 of pivot 24 are formed by a first fold back on itself and slots 53 of pivot 29 are formed by a loop at the end of the preformed member. In a similar manner slots are formed in the extension of the first member 16 for pivot 24. The arm 22 therefore includes a double wall configuration, which may increase strength. The interior wall of the double wall configuration forms the slots of the pivots. In embodiments (which are not shown) other configurations of the arm are possible, e.g. a multiple piece construction, an exterior wall forming said pivots.

Referring to figure 2, the first member 16 and second member 18 includes two gripping extensions 54 arranged on an interior surface for gripping of a pipe. The gripping extensions 54 are formed integrally with the first member, e.g. by pushing an indentation out of the material. In embodiments (which are not shown), other arrangements of extensions are possible, e.g. one or more and nonintegral configurations.

The first member 16 includes one or more protection extensions 56 arranged on an outer surface and in operative proximity of the catch in the close position. By operative proximity it is meant that they are positioned anywhere, e.g. within 5 mm or 10mm, to protect the arm 22 from impact. The protection extensions 56 are formed integrally with the first member, e.g. by pushing an indentation out of the material. In embodiments (which are not shown), other arrangements of extensions are possible, e.g. one or more and non-integral configurations.

Referring to Fig. 1 of the accompanying drawings, there is shown a Clasp Cable Protector Overview which has a Clasp Cable Protector 8, said Clasp Cable Protector is connected around Well Pipes 2, said Well Pipes are joined by a Coupling 4. Routed around said Coupling by said Clasp Cable Protector are the Cables 6.

Referring to Fig. 2 of the accompanying drawings, there is shown a Clasp Cable Protector Overview, detailing a Closed Clasp and detailing an Open Clasp. Said Clasp Cable Protector has a Spine 11 , at both ends of said Spine is a Clasp Cable Protector End, which may be referred to as a gripper 10. Connected via a Clasp Latch Pin at pivot 34 to said Clasp Cable Protector End is a Clasp Latch, which may be referred to as the second member 18. Said Clasp Latch rotates about said Clasp Latch Pin as indicated. At the free end of said Clasp Latch is a Clasp Latch Hook, which may be referred to as the catch 26. Connected to said Clasp Cable Protector End via a Clasp Pin at pivot 24 is the Clasp 22. Said Clasp retains the Clasp Lever, which may be referred to as a latch 26 via Clasp Lever Pins at pivot 29. Located on Said Clasp Cable Protector End and said Clasp Latch are Pipe Gripper Pads, which may be referred to as gripping extensions 54.

Referring to Fig. 3 of the accompanying drawings, there is shown a Clasp Cable Protector Overview . Said Clasp Cable Protector view shows the Spine 11 , connected to said Spine is a Clasp Cable Protector End 10, connected to said Clasp Cable Protector End via a Clasp Pin is the Clasp 22. Located on said Clasp Cable Protector Ends are Anti-Snag features which may refer to protection extensions 56, said Anti-Snag features prevent said Clasp from being caught during operation. Connected to said Clasp Cable Protector end via a Clasp Latch Pin at pivot 34 is the Clasp Latch 18, at the end of said Clasp Latch is a Clasp Latch Hook 26. Connected to said Clasp via Clasp Lever Pins is the Clasp Lever 26 During operation said Clasp Lever is located in said Clasp Latch Hook. Pipe Gripper Pads 54 apply forces to the Pipes (shown in Fig. 1 ).

Embodiments are also provided according to the following clauses:

Clause 1. A Cable Protector Device comprising on or more Clasp Cable Protectors: a Spine; a Clasp Cable Protector End; a Clasp Pin; a Clasp; a Clasp Lever; a pair of Clasp Lever Pins; a Clasp Latch; a Clasp Latch Pin; a Clasp Latch Hook; a series of Pipe Gripper Pads; a series of Anti-Snags.

Clause 2: The Cable Protector according to clause 1 or another embodiment as disclosed herein, wherein the forces applied to the Well Bore Pipe to hold said Clasp Cable Protector in place are created by the closing mechanism of the Clasp;

Clause 3: The Cable Protector according to any preceding clause or another embodiment as disclosed herein comprising one or more Clasp Cable Protectors: a Spine; a Clasp Cable Protector End; a Clasp Pin; a pair of Clasps; a Clasp Lever; a series of Clasp Lever Pins; a Clasp Latch; a Clasp Latch Pin; a Clasp Latch Hook; a series of Pipe Gripper Pads; a series of Anti-Snags.

Clause 4: The Cable Protector according to any preceding clause or another embodiment as disclosed herein comprising, wherein the forces applied to the Well Bore Pipe to hold said Clasp Cable Protector in place are created by the closing mechanism of multiple Clasps on each Clasp Cable Protector End.

As used in this specification, any formulation used of the style“at least one of A, B or C”, and the formulation“at least one of A, B and C” use a disjunctive“or” and a disjunctive“and” such that those formulations comprise any and all joint and several permutations of A, B, C, that is, A alone, B alone, C alone, A and B in any order, A and C in any order, B and C in any order and A, B, C in any order. There may be more or less than three features used in such formulations.

In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word‘comprising’ does not exclude the presence of other elements or steps then those listed in a claim. Furthermore, the terms“a” or“an,” as used herein, are defined as one or more than one. Also, the use of introductory phrases such as“at least one” and“one or more” in the claims should not be construed to imply that the introduction of another claim element by the indefinite articles "a" or "an" limits any particular claim containing such introduced claim element to inventions containing only one such element, even when the same claim includes the introductory phrases "one or more" or "at least one" and indefinite articles such as "a" or "an." The same holds true for the use of definite articles. Unless stated otherwise, terms such as“first” and“second” are used to arbitrarily distinguish between the elements such terms describe. Thus, these terms are not necessarily intended to indicate temporal or other prioritization of such elements. The mere fact that certain measures are recited in mutually different claims does not indicate that a combination of these measures cannot be used to advantage.

Unless otherwise explicitly stated as incompatible, or the physics or otherwise of the embodiments, example or claims prevent such a combination, the features of the foregoing embodiments and examples, and of the following claims may be integrated together in any suitable arrangement, especially ones where there is a beneficial effect in doing so. This is not limited to only any specified benefit, and instead may arise from an“ex post facto” benefit. This is to say that the combination of features is not limited by the described forms, particularly the form (e.g. numbering) of the example(s), embodiment(s), or dependency of the claim(s). Moreover, this also applies to the phrase “in one embodiment”,“according to an embodiment” and the like, which are merely a stylistic form of wording and are not to be construed as limiting the following features to a separate embodiment to all other instances of the same or similar wording. This is to say, a reference to‘an’,‘one’ or‘some’ embodiment(s) may be a reference to any one or more, and/or all embodiments, or combination(s) thereof, disclosed. Also, similarly, the reference to“the” embodiment may not be limited to the immediately preceding embodiment.

As used herein, any machine executable instructions, or compute readable media, may carry out a disclosed method, and may therefore be used synonymously with the term method, or each other.

The foregoing description of one or more implementations provides illustration and description, but is not intended to be exhaustive or to limit the scope of the invention to the precise form disclosed. Modifications and variations are possible in light of the above teachings or may be acquired from practice of various implementations of the present disclosure.

LIST OF REFERENCES

2 Pipe

13 Axis of symmetry

4 Coupler

6 Cables

8 Cable protector

10, 10A, 10B Gripper (first and/or second)

14 Gripping system

16 First member

30 Body

36 Extension

54 Gripping extensions 56 Protection extensions

18 Second member

32 Body

20 Clasp fastening system

22 Arm

38, 40 Extension 24 Pivot (arm to first member) 42 Axis

52 Slot

26 Latch

44 Axial members 46 T ransverse member 50 Ends

29 Pivot (arm to latch)

53 Slot

28 Catch

34 Pivot

11 Spine