Mounting and dismounting tool for oil pump joint

Abstract

The utility model discloses a mounting and dismounting tool for an oil pump joint, which comprises a tool base body, a fixing assembly and a torsion assembly, the fixing assembly is used for fixing the tool base body and the oil pump joint, and the tool base body and the oil pump joint can coaxially rotate under the condition that the tool base body and the oil pump joint are fixed; the torsion assembly is used for bearing torsion force applied externally and transmitting the torsion force to the oil pump connector through the tool base body and the fixing assembly.

Description

Technical Field

[0001] This application relates to the field of X-ray tube technology, and in particular to a tool for installing and removing oil pump connectors. Background Technology

[0002] Existing X-ray tube assemblies are all equipped with external heaters, which consist of three main parts: oil circuit, air circuit, and electrical system. The oil circuit includes the power source—the oil pump. The oil pump is a standard outsourced component. Its inlet and outlet ports have standard threads, while the oil pump connector is a non-standard part. One end of the oil pump connector has machined threads to match the oil pump, and the other end matches other components in the piping. This allows the power source—the oil pump—to be placed within the oil circuit. The oil pump connector serves to fix and lock onto the external radiator, ensuring a secure and reliable installation of the oil pump.

[0003] Because of its fixing function, the oil pump connector is made into a rotating body. When installing the oil pump connector onto the oil pump, the existing tool is a pipe wrench. However, using a pipe wrench is inconvenient and has low assembly efficiency. Furthermore, using a pipe wrench can easily damage the rotating surface of the oil pump connector, affecting its fixing function.

[0004] There is currently no effective solution to the technical problems of pipe wrenches directly acting on oil pump joints, which are inconvenient to operate and have low assembly efficiency in the existing technology. Utility Model Content

[0005] This utility model provides a tool for installing and disassembling oil pump connectors, which at least solves the technical problems of existing technologies, such as pipe wrenches directly acting on oil pump connectors, inconvenient operation, and low assembly efficiency.

[0006] According to one aspect of this application, an installation and removal tool for an oil pump connector is provided, comprising: a tooling base, a fixing component, and a torsion component: the fixing component is used to fix the tooling base to the oil pump connector, and when the tooling base and the oil pump connector are fixed, the tooling base and the oil pump connector can rotate coaxially; and the torsion component is used to withstand externally applied torsional force and to transmit the torsional force to the oil pump connector through the tooling base and the fixing component.

[0007] Optionally, the fixing component extends and protrudes from a first side of the tooling base, and the torsion component extends and protrudes from a second side of the tooling base, wherein the first side and the second side are arranged opposite to each other relative to the tooling base.

[0008] Optionally, the fixing assembly includes a plurality of force-bearing shafts extending from a first side of the tooling base, wherein the force-bearing shafts correspond to the force-bearing holes of the oil pump connector.

[0009] Optionally, the tooling base is provided with a mounting hole corresponding to the force-bearing shaft, and one end of the force-bearing shaft is provided with a flange, wherein the force-bearing shaft passes through the mounting hole from the second side of the tooling base, and the flange of the force-bearing shaft abuts against the second side of the tooling base.

[0010] Optionally, a mounting post extending from the second side is provided at the center of the second side of the tooling base, and a positioning ring surrounding the mounting post is also provided on the second side of the tooling base.

[0011] Optionally, the torsion assembly includes: a flange and a torsion column, wherein a first side of the flange is disposed opposite to a second side of the tooling base; and the torsion column is disposed on the second side of the flange and extends protruding from the second side of the flange, wherein the side surface of the torsion column is provided with at least one force-bearing surface.

[0012] Optionally, it also includes a plurality of screws for fixing the torsion assembly to the tooling base, and the flange is provided with mounting holes corresponding to the screws, and the tooling base is provided with threaded holes corresponding to the screws.

[0013] This application provides a tool for installing and removing an oil pump connector. The tool includes a fixture base, a fixing component, and a torsion component. The fixing component secures the fixture base to the oil pump connector, and the fixture base and oil pump connector can rotate coaxially while fixed. Furthermore, the torsion component withstands externally applied torsional forces and transmits these forces to the oil pump connector through the fixture base and the fixing component.

[0014] As described above, this application provides an installation and disassembly tool. Unlike existing methods that use pipe wrenches to directly act on the rotating surface of the oil pump connector for installation or disassembly, this application designs an installation and disassembly tool. Workers can install and disassemble the oil pump connector using an external hex wrench and this tool. This avoids direct contact between the pipe wrench and the oil pump connector, preventing damage. Furthermore, since the installation and disassembly tool is detachably connected to the oil pump connector via a fixing component, and the tooling base and fixing component can rotate coaxially when fixed, when the worker applies torque to the torque component using the external hex wrench, the torque can be transmitted to the oil pump connector through the tooling base and fixing component, thereby achieving the installation and disassembly of the oil pump connector and improving assembly efficiency. This solves the technical problems of existing technologies where pipe wrenches directly act on the oil pump connector, resulting in inconvenient operation and low assembly efficiency. Attached Figure Description

[0015] The following sections will describe some specific embodiments of this application in detail by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or components. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0016] Figure 1 This is a schematic diagram showing the connection relationship of the oil pump, oil pump connector, and installation / disassembly tools according to the embodiments of this application.

[0017] Figure 2 This is a schematic diagram of the installation and disassembly tools according to the embodiments of this application;

[0018] Figure 3 This is a disassembly diagram of the installation and disassembly tools according to the embodiments of this application;

[0019] Figure 4 This is a schematic diagram of one side of the mounting base according to an embodiment of this application;

[0020] Figure 5 This is a schematic diagram of the other side of the mounting base according to the embodiments of this application;

[0021] Figure 6 This is a schematic diagram of the torsion assembly according to an embodiment of this application. Detailed Implementation

[0022] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0023] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0024] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate for the embodiments of the utility model described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0025] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0026] Figure 1 This is a schematic diagram illustrating the connection relationship between the oil pump, oil pump connector, and installation / disassembly tools according to embodiments of this application. (Reference) Figure 1 As shown, an installation and removal tool 100 for an oil pump connector 200 includes: a tooling base 110, a fixing component 120, and a torsion component 130. The fixing component 120 is used to fix the tooling base 110 to the oil pump connector 200, and the tooling base 110 and the oil pump connector 200 can rotate coaxially when the tooling base 110 and the oil pump connector 200 are fixed. The torsion component 130 is used to withstand externally applied torsional force and transmit the torsional force to the oil pump connector 200 through the tooling base 110 and the fixing component 120.

[0027] As described in the background section, the oil pump connector is designed as a rotating body for its fixing function. When installing the oil pump connector onto the oil pump, the existing tool is a pipe wrench because the oil pump connector is a rotating body. Using a pipe wrench is inconvenient and has low assembly efficiency. Furthermore, using a pipe wrench can easily damage the rotating surface of the oil pump connector, affecting its fixing function.

[0028] In view of this, this application provides an installation and removal tool 100 for an oil pump connector 200. And refer to... Figure 1 As shown, the installation and disassembly tool 100 includes a tooling base 110 and a fixing component 120.

[0029] The fixing component 120 on the installation / removal tool 100 is detachably connected to the oil pump connector 200 and is used to fix the tooling base 110 to the oil pump connector 200. Thus, when the fixing component 120 is inserted into the oil pump connector 200 (i.e., when the tooling base 110 is fixed to the oil pump connector 200), the tooling base 110 and the oil pump connector 200 can rotate coaxially.

[0030] In addition, the installation and disassembly tool 100 also includes a torsion assembly 130. The torsion assembly 130 is used to withstand externally applied torsional forces and can transmit the torsional forces to the oil pump connector 200 through the tooling base 110 and the fixing assembly 120.

[0031] The following are the operating procedures for installing the oil pump connector 200 using the installation and disassembly tool 100:

[0032] First, the operator can hand-tighten the oil pump connector 200 onto the oil pump and stop when they feel resistance. Then, the operator inserts the fixing component 120 of the installation / removal tool 100 into the oil pump connector 200, ensuring that the mounting surface of the tooling base 110 is flush with the oil pump connector 200, thus securing the installation / removal tool 110 and the oil pump connector 200 in place.

[0033] Furthermore, for example, the operator can install an external hex wrench on the torsion assembly 130 of the installation and disassembly tool 100, and use the external hex wrench to twist the torsion assembly 130, thereby applying a certain torsion force to the torsion assembly 130.

[0034] Furthermore, since the tooling base 110 and the oil pump connector 200 can rotate coaxially, when the torsional force applied to the torsion assembly 130 is transmitted to the oil pump connector 200 through the tooling base 110 and the fixing assembly 120, the tooling base 110 and the fixing assembly 120 can drive the oil pump connector 200 to rotate together until the oil pump connector 200 is tightened.

[0035] Finally, the staff removed the external hex wrench from the installation and disassembly tool 100 and removed the installation and disassembly tool 100 from the oil pump connector 200, thus completing the installation of the oil pump connector 200.

[0036] The following are the operating procedures for disassembling the oil pump connector 200 using the installation and disassembly tool 100:

[0037] First, the worker inserts the fixing component 120 of the installation and disassembly tool 100 into the oil pump connector 200, and with the mounting surface of the tooling base 110 completely in contact with the oil pump connector 200, the worker installs the external hex wrench into the torsion component 130 of the installation and disassembly tool 100.

[0038] Then, the staff applies a certain torque to the torsion assembly 130 using an external hex wrench, and the torque is transmitted to the oil pump connector 200 through the tooling base 110 and the fixing assembly 120.

[0039] Furthermore, since the fixing component 120 and the tooling base 110 can rotate coaxially when fixed, when the torsional force applied to the torsion component 130 is transmitted to the oil pump connector 200 through the tooling base 110 and the fixing component 120, the tooling base 110 and the fixing component 120 can drive the oil pump connector 200 to rotate together until the oil pump connector 200 is disassembled.

[0040] Finally, the staff will remove the installation and disassembly tool 100 from the oil pump connector 200 and remove the external hex wrench from the installation and disassembly tool 100, thereby completing the disassembly of the oil pump connector 200.

[0041] Unlike existing methods that use pipe wrenches to directly act on the rotating surface of the oil pump connector 200 for installation or removal, this application designs an installation / removal tool 100. Workers can install and remove the oil pump connector 200 using an external hex wrench and the tool 100. This avoids direct contact between the pipe wrench and the oil pump connector 200, preventing damage. Furthermore, since the installation / removal tool 100 is detachably connected to the oil pump connector 200 via a fixing component 120, and the tooling base 110 and the fixing component 120 can rotate coaxially when fixed, when a worker applies torque to the torsion component 130 using an external hex wrench, the torque can be transmitted to the oil pump connector 200 through the tooling base 110 and the fixing component 120, thus enabling the installation and removal of the oil pump connector 200 and improving assembly efficiency. This solves the technical problems of existing technologies, such as pipe wrenches directly acting on oil pump joints, inconvenient operation, and low assembly efficiency.

[0042] Optionally, the fixing component 120 extends and protrudes from a first side of the tooling base 110, and the torsion component 130 extends and protrudes from a second side of the tooling base 110, wherein the first side and the second side are arranged opposite to each other relative to the tooling base 110.

[0043] Specifically, refer to Figure 1 As shown, the fixing component 120 extends and protrudes from the first side of the tooling base 110, so that the fixing component 120 can be inserted into the oil pump connector 200. The torsion component 130 extends and protrudes from the second side of the tooling base 110, so that an external hex wrench can be mounted on the torsion component 130.

[0044] Furthermore, when the fixing component 120 is inserted into the oil pump connector 200 and the external hex wrench is installed in the torsion component 130, a certain torsion force can be applied to the torsion component 130 using the external hex wrench, and the torsion force can be transmitted to the oil pump connector 200 through the fixing component 120.

[0045] Thus, when the torsional force is transmitted to the oil pump connector 200 through the fixing component 120, the oil pump connector 200 can be tightened and fixed to the oil pump or removed from the oil pump.

[0046] Optionally, the fixing assembly 120 includes a plurality of force-bearing shafts 121a to 121d extending from a first side of the tooling base 110, wherein the force-bearing shafts 121a to 121d correspond to the force-bearing holes 201a to 201d of the oil pump connector 200.

[0047] Specifically, Figure 2 This is a schematic diagram of the installation / removal tool 100 according to an embodiment of this application. (Reference) Figure 2 As shown, the fixing assembly 120 includes a plurality of force-bearing shafts 121a to 121d extending and protruding from the first side of the tooling base 110. This allows the operator to insert the plurality of force-bearing shafts 121a to 121d into the force-bearing holes 201a to 201d of the oil pump connector 200, thereby ensuring that the installation / disassembly tool 100 can be interconnected with the oil pump connector 200.

[0048] That is, when the operator inserts the multiple force-bearing shafts 121a-121d of the fixing component 120 into the force-bearing holes 201a-201d of the oil pump connector 200, the operator applies a torsional force to the torsion component 130 using an external hex wrench. This torsional force is transmitted through the fixing component 120 to the multiple force-bearing shafts 121a-121d. Since the multiple force-bearing shafts 121a-121d are inserted into the force-bearing holes 201a-201d of the oil pump connector 200, the torsional force is transmitted to the oil pump connector 200 through the multiple force-bearing shafts 121a-121d and the force-bearing holes 201a-201d. This ensures that the oil pump connector 200 can also rotate along with the installation / removal tool 100.

[0049] Optionally, the tooling base 110 is provided with mounting holes 111a-111d corresponding to the force-bearing shafts 121a-121d, and one end of the force-bearing shafts 121a-121d is provided with a flange, wherein the force-bearing shafts 121a-121d pass through the mounting holes 111a-111d from the second side of the tooling base 110, and the flange of the force-bearing shafts 121a-121d abuts against the second side of the tooling base 110.

[0050] Specifically, Figure 3 This is a disassembly diagram of the installation and disassembly tools according to the embodiments of this application. Figure 4This is a schematic diagram of one side of the mounting base according to an embodiment of this application. (Reference) Figure 3 and Figure 4 As shown, the tooling base 110 is provided with mounting holes 111a to 111d corresponding to the force-bearing shafts 121a to 121d. The force-bearing shafts 121a to 121d can pass through the mounting holes 111a to 111d into the tooling base 110.

[0051] Furthermore, a flange is provided at one end of the force-bearing shafts 121a to 121d, and when the force-bearing shafts 121a to 121d pass through the mounting holes 111a to 111d of the tooling base 110, the flange of the force-bearing shafts 121a to 121d can abut against the second side of the tooling base 110, thereby ensuring that the force-bearing shafts 121a to 121d are fixed on the tooling base 110.

[0052] Since the force-bearing shafts 121a to 121d are detachably mounted on the tooling base 110, it is convenient to replace the faulty or damaged force-bearing shafts 121a to 121d in the event of a fault or damage.

[0053] Optionally, a mounting post 112 extending from the second side is provided at the center of the second side of the tooling base 110, and the mounting post 112 corresponds to the inner diameter 202 of the oil pump connector 200; and a positioning ring 113 surrounding the mounting post 112 is also provided on the second side of the tooling base 110.

[0054] Specifically, Figure 5 This is a schematic diagram of the other side of the mounting base 100 according to an embodiment of this application. (See reference) Figure 1 and Figure 5 As shown, a protruding mounting post 112 is provided at the center of the second side of the tooling base 110. When the operator inserts the multiple force-bearing shafts 121a-121d of the fixing assembly 120 into the force-bearing holes 201a-201d of the oil pump connector 200, the mounting post 112 can be inserted precisely into the inner diameter 202 of the oil pump connector 200. Furthermore, since the mounting post 112 is inserted into the interior of the oil pump connector 200 (i.e., into the inner diameter 202), it prevents the installation / removal tool 100 from falling off the oil pump connector 200 when the operator uses an external hex wrench to twist it, thus ensuring proper installation.

[0055] Further, refer to Figure 5As shown, a positioning ring 113 surrounding the mounting post 112 is also provided on the second side of the tooling base 110. When the operator inserts the installation and disassembly tool 100 into the oil pump connector 200, the positioning ring 113 can fit against the inner diameter 202 of the oil pump connector 200, indicating that the installation and disassembly tool 100 and the oil pump connector 200 are installed in place.

[0056] Optionally, the torsion assembly 130 includes: a flange 131 and a torsion column 132, wherein a first side of the flange 131 is disposed opposite to a second side of the tooling base 110; and the torsion column 132 is disposed on the second side of the flange 131 and extends protruding from the second side of the flange 131, wherein at least one force-bearing surface 133 is provided on the side surface of the torsion column 132.

[0057] Specifically, Figure 6 This is a schematic diagram of a torsion assembly according to an embodiment of this application. (Reference) Figure 6 As shown, the torsion assembly 130 includes a flange 131 and a torsion rod 132. A first side of the flange 131 is positioned opposite a second side of the tooling base 110. The torsion rod 132 is located on the second side of the flange 131 and extends protruding from it. This allows an operator to mount an external hex wrench onto the torsion rod 132 and apply torque to the installation / removal tool 100 by rotating the torsion rod 132. The shape of the torsion rod 132 corresponds to the shape of the external hex wrench.

[0058] Furthermore, those skilled in the art should understand that the above is merely an example of the shape of the torsion column 132, and the actual situation is not limited to this, as long as the torsion column 132 is provided with at least one force-bearing surface 133.

[0059] Thus, the above product structure achieves the technical effect of ensuring the tightening of the installation and disassembly tool 100.

[0060] Optionally, it also includes a plurality of screws 141a to 141d for fixing the torsion assembly 130 to the tooling base 110, and the flange 131 is provided with mounting holes 134a to 134d corresponding to the screws 141a to 141d, and the tooling base 110 is provided with threaded holes 114a to 114d corresponding to the screws 141a to 141d.

[0061] Specifically, refer to Figure 3 As shown, the installation and disassembly tool 100 also includes a plurality of screws 141a to 141d. The flange 131 of the torsion assembly 130 is provided with mounting holes 134a to 134d corresponding to the screws 141a to 141d. Thus, the plurality of screws 141a to 141d can be installed on the torsion assembly 130 through the mounting holes 134a to 134d.

[0062] Furthermore, the tooling base 110 is provided with threaded holes 114a-114d corresponding to the screws 141a-141d, so that when the screws 141a-141d pass through the mounting holes 134a-134d, they can be further inserted into the corresponding threaded holes 114a-114d. And when the screws 141a-141d are tightened, the screws 141a-141d can connect the torsion assembly 130 and the tooling base 110, thereby ensuring the complete assembly and disassembly of the tool 100.

[0063] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0064] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0065] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0066] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A mounting and demounting tool (100) for an oil pump connection (200), characterized in that Comprising: a tool base (110), a fixing assembly (120), and a torsion assembly (130): the fixing assembly (120) is used to fix the tool base (110) and the oil pump joint (200), and the tool base (110) and the oil pump joint (200) can rotate coaxially when the tool base (110) and the oil pump joint (200) are fixed; and the torsion assembly (130) is used to bear an externally applied torsion force and transmit the torsion force to the oil pump joint (200) through the tool base (110) and the fixing assembly (120).

2. The installation and removal tool (100) according to claim 1, wherein the fixing assembly (120) extends and protrudes from a first side of the tool base (110), and the torsion assembly (130) extends and protrudes from a second side of the tool base (110), wherein the first side and the second side are oppositely arranged with respect to the tool base (110).

3. The mounting and demounting tool (100) according to claim 1 or 2, characterized in that the fixing assembly (120) comprises a plurality of force receiving shafts (121a-121d) extending and protruding from the first side of the tool base (110), wherein the force receiving shafts (121a-121d) correspond to (201a-201d) force receiving holes of the oil pump joint (200).

4. The mounting and demounting tool (100) according to claim 3, characterized in that the tool base (110) is provided with mounting holes (111a-111d) corresponding to the force receiving shafts (121a-121d), and one end of the force receiving shafts (121a-121d) is provided with a flange, wherein the force receiving shafts (121a-121d) pass through the mounting holes (111a-111d) from the second side of the tool base (110), and the flanges of the force receiving shafts (121a-121d) abut against the second side of the tool base (110).

5. The mounting and demounting tool (100) according to claim 1 or 2, characterized in that a mounting column (112) extending and protruding from the second side of the tool base (110) is arranged at a central position of the second side, and the mounting column (112) corresponds to an inner diameter (202) of the oil pump joint (200); and the second side of the tool base (110) is further provided with a positioning ring (113) surrounding the mounting column (112).

6. The mounting and demounting tool (100) according to claim 1 or 2, characterized in that the torsion assembly (130) comprises a flange plate (131) and a torsion column (132), wherein a first side of the flange plate (131) is oppositely arranged with respect to the second side of the tool base (110); and the torsion column (132) is arranged at a second side of the flange plate (131) and extends and protrudes from the second side of the flange plate (131), wherein at least one force receiving surface (133) is arranged on a side surface of the torsion column (132).

7. The mounting and demounting tool (100) according to claim 6, characterized in that a plurality of screws (141a-141d) are further included for fixing the torsion assembly (130) and the tool base (110), and The flange plate (131) is provided with mounting holes (134a-134d) corresponding to the screws (141a-141d), and the tool base body (110) is provided with threaded holes (114a-114d) corresponding to the screws (141a-141d).

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