Computing system

Abstract

A computing system includes a chassis and a housing. The chassis includes one or more locking hooks. The housing includes a handle, a linkage assembly, and a crank coupled to the handle and the linkage assembly. Rotating the handle from an unlocked position to a locked position lowers the housing relative to the chassis until the housing is locked in the one or more locking hooks of the chassis.

Description

Technical Field

[0001] The present invention relates to a locking mechanism, and more specifically, to a locking mechanism for a switching module in a computing system. Background Technology

[0002] Computing systems typically have electronic components housed in a chassis. Examples of computing systems include desktop computers, blade servers, rack servers, etc. For organization purposes, electronic components may be grouped or housed in enclosures within the computing system chassis. For example, a Peripheral Component Interconnect Express (PCIe) adapter enclosure or PCIe adapter module can be used to house one or more PCIe adapter cards that accept one or more PCIe cards. In some examples, the PCIe card may be a graphics processing unit (GPU) card, a network interface card, a PCIe memory card, etc. Electronic components housed in the chassis may require replacement or repair by a service technician. During repair, electronic components may need to be removed. To access electronic components housed in an enclosure (e.g., a PCIe adapter enclosure) for replacement or repair, the enclosure may need to be removed. The physical force applied by the service technician to remove the enclosure from the chassis may be extremely significant. This invention provides a solution that at least reduces the difficulty associated with assembling and disassembling the internal components of a computing system. Summary of the Invention

[0003] The terms used in the description of embodiments, and similar terms (e.g., implementation, configuration, feature, example, and option), are intended to refer broadly to all aspects of the invention and the appended claims. Several statements containing these terms should be understood as not limiting the subject matter described herein or limiting the meaning or scope of the appended claims. The embodiments of the invention covered herein are defined by the appended claims, not by the scope of the invention itself. This summary is a high-level overview of various features of the invention and introduces some concepts further described in the following description paragraphs. This summary is not intended to identify key or essential features of the subject matter of the claims, nor is it intended to be used independently to determine the scope of the subject matter of the claims. The subject matter should be understood through reference to appropriate portions of the complete specification of the invention, any or all of the accompanying drawings, and each claim.

[0004] According to certain features of the invention, a computing system is disclosed, including a chassis and a housing. The chassis includes one or more locking hooks. The housing includes a handle, a linkage assembly, and a crank coupled to both the handle and the linkage assembly. Rotating the handle from an unlocked position to a locked position lowers the housing relative to the chassis until the housing is locked in one or more locking hooks of the chassis.

[0005] In some embodiments, the linkage assembly includes a first link, a second link, a third link, and a fourth link. A second link is coupled to the first, third, and fourth links. The fourth link is coupled to a crank. The first and third links engage one or more locking hooks of the chassis. In some embodiments, rotating the handle from the unlocked position to the locked position rotates the first link in the same direction as the handle's rotation and rotates the third link in the opposite direction to the rotation of the first link and the handle.

[0006] In some embodiments, rotating the handle from the unlocked position to the locked position increases (i) an angle between the second and first levers, and (ii) an angle between the second and third levers. In some embodiments, the first lever includes a first locking protrusion and the third lever includes a second locking protrusion. The first and second locking protrusions engage one or more locking hooks of the chassis to cause the housing to lower relative to the chassis. In some embodiments, when the handle is rotated from the unlocked position to the locked position, the first and second locking protrusions engaging with one or more locking hooks of the chassis cause the housing to lower relative to the chassis. In some embodiments, when the handle is rotated from the unlocked position to the locked position, the first and second locking protrusions move toward each other.

[0007] In some embodiments, the chassis further includes one or more guides coupled to the second lever to prevent rotation of the second lever. Rotating the handle from the unlocked position to the locked position causes the second lever to move along one or more guides toward the crank. In some embodiments, the first lever includes a first sliding section and the third lever includes a second sliding section, such that rotating the handle from the unlocked position to the locked position causes the second lever to slide along the first sliding section and the second sliding section.

[0008] In some embodiments, at least a portion of the second lever has a curvature that matches the curvature of a crank. In some embodiments, the crank has a teardrop shape, and the crank is coupled to a connecting rod assembly at the apex of the teardrop shape. In some embodiments, the housing includes one or more electronic components having a first connector, such that lowering the housing relative to the chassis allows the first connector to interlock with a second connector on a circuit board of the computing system.

[0009] According to certain features of the invention, a computing system is disclosed, including a chassis and a housing. The chassis includes a locking hook. The housing includes a handle, a linkage assembly, and a crank. The handle is movable between an unlocked position and a locked position. The linkage assembly has a plurality of interconnecting links. At least one of the plurality of interconnecting links has a locking protrusion. The crank couples the handle to the linkage assembly. The crank rotates in response to movement of the handle. Rotation of the crank causes engagement or disengagement between the locking protrusion and the locking hook. In the unlocked position, the locking protrusion engages with the locking hook. In the locked position, the locking protrusion disengages from the locking hook.

[0010] In some embodiments, the multiple interconnecting rods include a first rod, a second rod, a third rod, and a fourth rod. A second rod is coupled to the first, third, and fourth rods. The fourth rod is coupled to a crank. The locking protrusions are multiple locking protrusions located on the first and third rods. In some embodiments, movement of the handle from the unlocked position to the locked position includes rotating the handle. Movement of the handle causes the first rod to rotate in the same direction as the direction of rotation of the handle. Movement of the handle causes the third rod to rotate in the opposite direction to the direction of rotation of the first rod and the handle.

[0011] In some embodiments, movement of the handle from the unlocked position to the locked position increases (i) an angle between the second lever and the first lever, and (ii) an angle between the second lever and the third lever. In some embodiments, at least a portion of the second lever has a curvature that matches a curvature of the crank. In some embodiments, when the handle moves from the unlocked position to the locked position, a plurality of locking protrusions engaging with the chassis cause the housing to lower relative to the chassis of the computing system. In some embodiments, when the handle moves from the unlocked position to the locked position, the plurality of locking protrusions move toward each other. In some embodiments, the first lever and the third lever are coupled to the second lever at opposite ends of the second lever.

[0012] The foregoing description is not intended to present every embodiment or feature of the invention. Rather, it provides only examples of some novel features and characteristics set forth herein. The above features and advantages, as well as other features and advantages, will become apparent from the following detailed description of representative embodiments and modes for carrying out the invention, taken in conjunction with the accompanying drawings and appended claims. Additional features of the invention will be apparent to those skilled in the art from the following brief description of various embodiments with reference to the accompanying drawings and the provided symbols. Attached Figure Description

[0013] The invention and its advantages, along with the accompanying drawings, will be better understood from the following description of exemplary embodiments in conjunction with the accompanying drawings. These drawings illustrate exemplary embodiments only and should therefore not be construed as limiting the various embodiments or claims.

[0014] Figure 1 As a feature of the invention, a side view of a locking mechanism on an adapter housing in an unlocked position;

[0015] Figure 2 For certain features of the present invention, Figure 1 The locking mechanism is located in a middle position in the side view;

[0016] Figure 3 For certain features of the present invention, Figure 1 The locking mechanism is located in a locked position in the side view;

[0017] Figure 4 A front perspective view of a computing system and an adapter housing for certain features of the present invention;

[0018] Figure 5 For certain features of the present invention, Figure 4 The side view of the computing system and the adapter housing;

[0019] Figure 6 For certain features of the present invention, Figure 4 A top-view perspective view of the computing system and the adapter housing;

[0020] Figure 7 For certain features of the present invention, Figure 6 A side view of the computing system;

[0021] Figure 8 For certain features of the present invention, Figure 4 A top-down perspective view of the computing system, with the adapter housing positioned inside the computing system's chassis;

[0022] Figure 9 For certain features of the present invention, Figure 8 A side view of the computing system;

[0023] Figure 10 For certain features of the present invention, Figure 4 The top-view perspective of the computing system, with the locking mechanism of the adapter housing located in a central position;

[0024] Figure 11 For certain features of the present invention, Figure 10 A side view of the computing system;

[0025] Figure 12 For certain features of the present invention, Figure 4A top-down perspective view of the computing system, with the locking mechanism of the adapter housing in a locked position;

[0026] Figure 13 For certain features of the present invention, Figure 12 A side view of the computing system.

[0027] Symbol Explanation

[0028] 100: Adapter housing

[0029] 101: Main Body

[0030] 102: Handle

[0031] 103: Locking mechanism

[0032] 104: Handle

[0033] 105: Crankshaft and connecting rod pivot

[0034] 106: Crank

[0035] 108: First Axis

[0036] 110: Location

[0037] 112: First Pivot

[0038] 114: First locking protrusion

[0039] 116: First shot

[0040] 118: First sliding segment

[0041] 120: First end

[0042] 122: Second shot

[0043] 124,134: Guide

[0044] 126, 132: Couplers

[0045] 128: Third Pivot

[0046] 130: Fourth shot

[0047] 136: Second End

[0048] 138: Second sliding segment

[0049] 140: Second locking protrusion

[0050] 142: Third shot

[0051] 144: Second Pivot

[0052] 146: Connector

[0053] 202, 204, 206: Direction

[0054] 404: Computing System

[0055] 406: Linkage assembly

[0056] 410: Chassis

[0057] 412, 414: Side

[0058] 416: Circuit Board

[0059] 702: First locking hook

[0060] 704: Second locking hook

[0061] 706: Connector

[0062] 902: First Height

[0063] 1102: Second Altitude Detailed Implementation

[0064] Electronic components housed in one or more enclosures within a computing system may be difficult to access. Sometimes, the enclosure must be removed before access to the electronic components can be obtained. Removing the enclosure can be a time-consuming activity, involving the application of pulling and pushing forces that could damage components within the computing system. Embodiments of the present invention provide a locking mechanism that facilitates the installation and removal of enclosures within a computing system chassis. The locking mechanism reduces the force and effort required by a technician when connecting and / or disconnecting electronic components housed in the enclosure. The locking mechanism also facilitates the connection (or disconnection) of the housed electronic components to a circuit board mounted in the chassis.

[0065] Various embodiments are described with reference to the accompanying drawings, throughout which similar reference numerals are used to designate similar or equivalent elements. The drawings are not drawn to scale and are provided solely to illustrate the features and characteristics of the invention. It should be understood that many specific details, relationships, and methods are set forth to provide a comprehensive understanding. However, those skilled in the art will readily appreciate that various embodiments may be practiced without one or more specific details or in other ways. In some cases, well-known constructions or operations are not shown in detail for illustrative purposes. The various embodiments are not limited to the order in which actions or events are shown, as some actions may occur in a different order and / or simultaneously with other actions or events. Furthermore, not all actions or events shown are necessary for implementing certain features and characteristics of the invention.

[0066] For the purposes of this embodiment, unless explicitly stated otherwise, the singular includes the plural and vice versa. The term "including" means "including but not limited to". Furthermore, approximate words such as "about (about), almost, substantially, approximatelyly" and similar words may be meant herein as, for example, "at," "near, nearly at," "within 3-5% of," "within acceptable manufacturing tolerances," or any logical combination thereof. Similarly, the terms "vertical" or "horizontal" are intended to additionally include "within 3-5%" in the vertical or horizontal direction, respectively. Furthermore, directional terms such as "top," "bottom," "left," "right," "above," and "below" are intended to relate to the equivalent directions depicted in the reference illustrations; to be understood from the context of the referenced object or element, such as from its usual location; or other such descriptions.

[0067] Reference Figure 1 This image shows a side view of a locking mechanism 103 on an adapter housing 100 in an unlocked position, according to certain features of the invention. The adapter housing 100 includes a body 101 for securing the locking mechanism 103 and a connector 146. Figure 2 The body 101 may be metal. The locking mechanism 103 includes a handle 102 connected to a lever 104. The handle 102 provides a ergonomic position for a maintenance technician to operate the lever 104. The lever 104 is coupled to a linkage assembly 406 via a crank 106. The crank 106 is secured to the lever 104 at one or more locations 110 such that rotational movement of the lever 104 is transmitted to the crank 106, causing the crank 106 to also rotate. The crank 106 rotates in the same direction as the rotation of the lever 104. Both the lever 104 and the crank 106 rotate about a first shaft 108. A bearing (not shown) may be provided at the first shaft 108 to facilitate rotational movement of the lever 104 and the crank 106. The crank 106 and the lever 104 are coupled at the first shaft 108 to the body 101 of the adapter housing 100.

[0068] Figure 1The crank 106 has a teardrop shape, but in some embodiments, the crank 106 may be circular. The crank 106 is coupled to the connecting rod assembly 406 at a crank-connecting rod pivot 105. The crank-connecting rod pivot 105 is located at one tip of the teardrop shape of the crank 106. The connecting rod assembly 406 coupled to the crank 106 includes a plurality of interconnecting links. The connecting rod assembly 406 includes a first link 116, a second link 122, a third link 142, and a fourth link 130. The first link 116 is directly coupled to the second link 122, and the second link 122 is directly coupled to both the third link 142 and the fourth link 130.

[0069] A first rod 116 is coupled to the body 101 of a transition housing 100 at a first pivot 112. The first pivot 112 may include a bearing that causes the first rod 116 to rotate in a plane parallel to the body 101 of the transition housing 100. The first rod 116 includes a first sliding section 118. The first sliding section 118 is a gap in the first rod 116 that allows a second rod 122 to slide along the first rod 116. The first sliding section 118 also causes the first rod 116 to rotate relative to the second rod 122.

[0070] Similarly, the third link 142 is coupled to the body 101 of the transition housing 100 at a second pivot 144. The second pivot 144 causes the third link 142 to rotate in the same plane as the first link 116. The third link 142 includes a second sliding section 138. The second sliding section 138 is a gap in the third link 142 that allows the second link 122 to slide along the third link 142. The second sliding section 138 also causes the third link 142 to rotate relative to the second link 122. In some embodiments, when the locking mechanism 103 is in the unlocked position, an angle of approximately 115 degrees is formed between the first link 116 and the second link 122, and the angle between the third link 142 and the second link 122 is also approximately 115 degrees. The first link 116 and the third link 142 each include a first locking protrusion 114 and a second locking protrusion 140.

[0071] The second lever 122 is coupled to the first lever 116 and the third lever 142 at a first end 120 and a second end 136, respectively. The first end 120 and the second end 136 include a bearing, button, fastener, or some other type of coupler for engaging the first lever 116 and the third lever 142 to the second lever 122. When the locking mechanism 103 is in... Figure 1When in the unlocked position, the first end 120 and the second end 136 of the second rod 122 are positioned at the ends of both the first rod 116 and the third rod 142. The second rod 122 may have multiple couplers 126 and 132 that couple the second rod 122 to one or more guides 124 and 134 in the body 101 of the adapter housing 100. The multiple couplers 126 and 132 and the one or more guides 124 and 134 restrict the movement of the second rod 122, preventing lateral movement of the second rod 122 and ensuring that the second rod 122 only moves up and down.

[0072] When handle 104 is rotated counterclockwise and clockwise, the fourth lever 130, coupled to crank 106, is lifted upward and downward respectively via crank 106. The fourth lever 130 is coupled to the second lever 122 at a third pivot 128. When crank 106 moves the fourth lever 130 up and down, the fourth lever 130 pulls the second lever 122 up and down at the third pivot 128. Figure 2 The display shows that the second lever 122 moves upward in response to a slight counterclockwise rotation of the handle 104. Figure 1 The locking mechanism 103 is located in a middle position in the side view.

[0073] exist Figure 2 In this configuration, rotating handle 104 counterclockwise, as indicated by direction 204, causes first lever 116 to rotate counterclockwise, as indicated by direction 202. First lever 116 rotates about first pivot 112, increasing the angle between first lever 116 and second lever 122. Similarly, rotating handle 104 counterclockwise causes third lever 142 to rotate clockwise, as indicated by direction 206. Third lever 142 rotates about second pivot 144, increasing the angle between third lever 142 and second lever 122. Second lever 122 slides along first sliding segment 118 and second sliding segment 138 to cause rotation of first lever 116 and third lever 142. Second lever 122 also shows upward movement along one or more guides 124 and 134.

[0074] Figure 3 This demonstrates certain features according to the present invention. Figure 1 The locking mechanism 103 is shown in a side view in a locked position. In the locked position, the first end 120 and the second end 136 of the second lever 122 are aligned with the first lever 116 and the third lever 142. The second lever 122 is in the first sliding section 118 ( Figure 2 ) and the second sliding segment 138 ( Figure 2 The very end of the second rod (122) cannot be moved upwards any further.

[0075] In some implementations, the second rod 122 is not... Figure 1 as well as Figure 2The shown link is a single rod, but includes a curvature that matches crank 106. The curvature of the second rod 122 allows the first pivot 112 and the second pivot 144 to be positioned at a height similar to that of crank 106. Rotating the first rod 116 and the third rod 142 at the first pivot 112 and the second pivot 144, respectively, causes the second rod 122 to move upward toward crank 106. Therefore, the curvature of the second rod 122 allows the first end 120 and the second end 136 of the second rod 122 to move upward to the same height as the first pivot 112 and the second pivot 144.

[0076] In some embodiments, the second rod 122 does not include the curvature and position of the crank 106, and the second pivot 144 is at a height below the crank 106. In some embodiments, when the second rod 122 is a straight rod, the first sliding segment 118 ( Figure 2 The length of the first sliding segment and the second sliding segment 138 ( Figure 2 The length of the second rod 122 is designed such that the first end 120 and the second end 136 of the second rod 122 cannot be moved to the same height as the first pivot 112 and the second pivot 144.

[0077] Figure 4 A front perspective view of a computing system 404 and an adapter housing 100, according to certain features of the present invention. Figure 5 Side view of the computing system 404 and the adapter housing 100, according to certain features of the invention. (See reference) Figure 4 as well as Figure 5 Both, the adapter housing 100 can be installed in the computing system 404. The computing system 404 includes a circuit board 416 and a chassis 410 for holding the components of the computing system 404. The adapter housing 100 is slidable along the sides 412 and 414 of the chassis 410. Opposite to the sides 412 and 414, the chassis 410 also includes one or more locking mechanisms 103 that can engage with the adapter housing 100. Figure 1 (e.g., a first locking hook 702 and a second locking hook 704) are engaged with locking hooks.

[0078] Figure 6 According to certain features of the invention, a top perspective view of the computing system 404 and the adapter housing 100 is provided. A side perspective view of the linkage assembly 406 of the adapter housing 100 is also provided. The perspective view shows a three-dimensional representation of the first locking protrusion 114 and the second locking protrusion 140. The first locking protrusion 114 and the second locking protrusion 140 are protrusions that cause the adapter housing 100 to be secured to the chassis 404. Figure 7A side view of the computing system 404 and the adapter housing 100 according to certain features of the invention. A first locking protrusion 114 can be received by a first locking hook 702, and a second locking protrusion 140 can be received by a second locking hook 704. When the adapter housing 100 is properly installed in the computing system 404, the connector 146 will be properly engaged with a connector 706 located on a circuit board 416 (e.g., a motherboard) in the computing system 404. Locking mechanism 103 ( Figure 1 The locking protrusion 114 and the second locking protrusion 140 should be in the unlocked position so that the first locking protrusion 114 and the second locking protrusion 140 are received by the first locking hook 702 and the second locking hook 704, respectively.

[0079] Figure 8 According to certain features of the invention, a top perspective view of the computing system 404 is provided, with the adapter housing 100 positioned within the chassis 410 of the computing system 404. For better viewing of the locking mechanism 103 (… Figure 1 The first locking hook 702 and the second locking hook 704 are not in the state of ) Figure 8 It is displayed in the middle. Figure 9 According to certain features of the present invention, Figure 8 A side view of the computing system 404 and the positioning adapter housing 100. Figure 9 The side view shows the locking mechanism 103 ( Figure 1 When unlocked, how the adapter housing 100 is located within the computing system 404. The adapter housing 100 extends a first height 902 above the computing system 404.

[0080] Figure 10 According to certain features of the invention, a top perspective view of the computing system 404 is shown, with the locking mechanism 103 of the adapter housing 100 located in an intermediate position. Figure 11 According to certain features of the present invention, Figure 10 A side view of the computing system 404. When handle 104 is rotated counterclockwise, first lever 116 rotates counterclockwise and third lever 142 rotates clockwise, as described above. Figure 2 As described. The counterclockwise movement of the first lever 116 and the clockwise movement of the third lever 142 pull the first locking protrusion 114 and the second locking protrusion 140 toward each other along one or more locking hooks 702 and 704. When the second locking protrusion 140 and the first locking protrusion 114 are pulled toward each other, the rotation of the first lever 116 and the third lever 142 pulls the adapter housing 100 downward, causing the connector 146 to engage with the connector 706. Figure 11 The display adapter housing 100 extends a second height 1102 above the computing system 404. In some embodiments, the second height 1102 is smaller than the first height 902.

[0081] Figure 12 According to certain features of the present invention, a top perspective view of the computing system 404 is shown, with the locking mechanism of the adapter housing 100 in the locked position. Figure 13 According to certain features of the present invention, Figure 12 Side view of computing system 404. Figure 12 as well as Figure 13 The adapter housing 100 is shown in a position where connectors 146 and 706 are fully overlapped. (Comparison) Figures 11 to 13 The adapter housing 100 is contained within the computing system 404, and no part of the adapter housing 100 extends above the computing system 404. In some embodiments, the adapter housing 100 uses Airmax connectors (e.g., connectors 146 and 706 are interlocking Airmax connectors). A locking mechanism 103 allows a service technician to install the adapter housing 100 overcoming the force (approximately 18 kgf) generated by the interlocking of the Airmax connectors. The locking mechanism 103 allows the service technician to easily disassemble and reassemble the adapter housing 100.

[0082] Although embodiments of the invention have been shown and described with respect to one or more implementations, equivalents and modifications will arise in those skilled in the art upon reading and understanding this specification and the accompanying drawings. Furthermore, while specific features of the invention may have been disclosed with respect to only one of several implementations, such features may be combined with one or more other features of other implementations, as may be desired and advantageous for any given or particular application.

[0083] While various embodiments of the invention have been described above, it should be understood that they are presented by way of example only and not as limiting. Various modifications may be made to the embodiments disclosed herein without departing from the spirit or scope of the invention. Therefore, the breadth and scope of the invention should not be limited by any of the foregoing embodiments. Rather, the scope of the invention should be defined by the appended claims and their equivalents.

Claims

1. A computing system, comprising: The chassis includes one or more locking hooks; The housing includes a handle, a linkage assembly, and a crank coupled to both the handle and the linkage assembly, such that rotating the handle from an unlocked position to a locked position lowers the housing relative to the chassis until the housing is locked in one or more locking hooks of the chassis; The linkage assembly includes a first rod, a second rod, a third rod, and a fourth rod, wherein the second rod is coupled to the first rod, the third rod, and the fourth rod, wherein the fourth rod is coupled to the crank, and wherein the first rod and the third rod engage with one or more locking hooks of the chassis; Rotating the handle from the unlocked position to the locked position will rotate the first lever in the same direction as the handle's rotation, and rotate the third lever in the opposite direction to both the first lever and the handle's rotation.

2. The computing system of claim 1, wherein rotating the handle from the unlocked position to the locked position increases the angle between the second lever and the first lever, and the angle between the second lever and the third lever.

3. The computing system of claim 1, wherein the first lever includes a first locking protrusion and the third lever includes a second locking protrusion, the first locking protrusion and the second locking protrusion engaging one or more locking hooks of the chassis to cause the housing to be lowered relative to the chassis.

4. The computing system of claim 3, wherein when the handle is rotated from the unlocked position to the locked position, the first locking protrusion and the second locking protrusion, which engage with one or more locking hooks of the chassis, cause the housing to lower relative to the chassis.

5. The computing system of claim 3, wherein when the handle is rotated from the unlocked position to the locked position, the first locking protrusion and the second locking protrusion move toward each other.

6. The computing system of claim 1, wherein the chassis further includes one or more guides coupled to the second lever to prevent rotation of the second lever, wherein rotating the handle from the unlocked position to the locked position causes the second lever to move along the one or more guides toward the crank.

7. The computing system of claim 1, wherein the first lever includes a first sliding segment and the third lever includes a second sliding segment, such that rotating the handle from the unlocked position to the locked position causes the second lever to slide along the first sliding segment and the second sliding segment.

8. A computing system, comprising: The chassis includes a locking hook; as well as The housing includes: The handle can move between the unlocked and locked positions; A linkage assembly having a plurality of interconnecting rods, at least one of the plurality of interconnecting rods having a locking protrusion; and A crank that couples the handle to the linkage assembly rotates in response to movement of the handle. The rotation of the crank causes engagement or disengagement between the locking protrusion and the locking hook. In the unlocked position, the locking protrusion engages with the locking hook, and in the locked position, the locking protrusion disengages from the locking hook. The plurality of interconnecting rods include a first rod, a second rod, a third rod, and a fourth rod, wherein the second rod is coupled to the first rod, the third rod, and the fourth rod, wherein the fourth rod is coupled to the crank, and wherein the locking protrusions are a plurality of locking protrusions located on the first rod and the third rod; Rotating the handle from the unlocked position to the locked position will rotate the first lever in the same direction as the handle's rotation, and rotate the third lever in the opposite direction to both the first lever and the handle's rotation.

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