A chip testing fixture

Abstract

The present invention discloses a chip testing jig, which relates to the field of chip testing technology, and can adjust the downward pressure stroke of the jig, improve the application scope of the jig, and reduce production costs. A chip testing process of a chip testing jig: put the chip into a connecting frame, then fasten the chip pressing seat with the connecting frame, and then use a downward pressure drive component to drive the downward pressure block to press down. After completing the chip pressing and testing work, reset the downward pressure drive component and open the chip pressing seat, take out the chip, and put in the next chip to be tested. If the size of the chip to be tested has not changed, but the thickness has changed, the downward pressure stroke of the downward pressure block can be adjusted by the stroke adjustment component to avoid damaging the chip or failing to press the chip, thereby achieving a set of jigs to adapt to chip tests of various thicknesses.

Description

Technical Field

[0001] The present invention relates to the technical field of chip testing, and in particular to a chip testing fixture. Background Art

[0002] Before the chip leaves the factory, it needs to be tested. Traditional test fixtures mostly use vertical downward pressure fixtures. During the test, the chip is placed in the fixture, and then the chip and the test board are pressed together to complete the test. When the chip thickness changes, the downward pressure stroke of the fixture is fixed and the chip will be damaged. Therefore, the fixture needs to be redesigned, and it is impossible to achieve a set of fixtures that are suitable for testing chips of various thicknesses. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a chip testing fixture, which can adjust the downward stroke of the fixture, improve the application range of the fixture, and reduce production costs.

[0004] A chip testing fixture according to an embodiment of the present invention includes an adapter plate, which is arranged on a chip testing board; a connecting frame, which is detachably arranged on the adapter plate; a chip pressing seat, which is hinged to one side of the connecting frame, and the orthographic projection of the chip pressing seat on the adapter plate coincides with the connecting frame; the chip pressing seat includes: a seat body, a pressing block and a pressing drive assembly, the pressing drive assembly drives the pressing block to rise or fall in a vertical direction, and the pressing block presses the chip on the testing board; the chip pressing seat also includes a stroke adjustment assembly, and the stroke adjustment assembly can adjust the maximum stroke of the pressing block so that the chip is not crushed.

[0005] At least the following beneficial effects are achieved: a chip test fixture comprises an adapter plate, a connection frame and a chip pressing seat. The adapter plate is arranged on the chip test plate. The connection frame is detachably arranged on the adapter plate. The chip pressing seat is hinged to one side of the connection frame, and the positive projection of the chip pressing seat on the adapter plate coincides with the connection frame. The fixture installation process: firstly, the adapter plate is placed on the chip test plate, and then the adapter plate and the chip test plate are fixed by fasteners, and then the connection frame and the adapter plate are connected and fixed by fasteners to complete the installation of the fixture. The chip testing process: the chip is placed in the connection frame, and then the chip pressing seat is fastened with the connection frame, and then the pressing block is driven downward by the pressing drive component, and after the chip pressing and testing work is completed, the pressing drive component is reset and the chip pressing seat is opened, the chip is taken out, and the next chip to be tested is placed. If the size of the chip to be tested does not change, but the thickness changes, the pressing stroke of the pressing block can be adjusted by the stroke adjustment component to avoid damaging the chip or failing to press the chip, thereby realizing a set of fixtures to adapt to chip tests of various thicknesses.

[0006] According to some embodiments of the present invention, the downward pressure driving assembly includes a guide groove, a screw, an adapter plate and a knob, the guide groove is opened on the seat body, the downward pressure block is arranged in the guide groove in a liftable manner, a thread groove is opened on the downward pressure block, the axis of the thread groove is parallel to the vertical direction, the screw is screwed in the thread groove, and the seat body is also provided with an adapter plate accommodating groove, the adapter plate accommodating groove is connected with the guide groove, the adapter plate accommodating groove is located above the guide groove, the adapter plate is fixed at the end of the screw, the knob is rotatably arranged on the seat body, the knob is connected to the adapter plate by a screw, the adapter plate is abutted against the upper edge of the adapter plate accommodating groove, when the knob is rotated, the adapter plate and the screw follow the knob to rotate, and the downward pressure block rises or falls along the guide groove when the screw rotates.

[0007] According to some embodiments of the present invention, the stroke adjustment assembly includes a limit plate, a limit groove, a limit column and a limit plate adjustment mechanism, the limit plate can be rotatably mounted on the seat body, a limit plate fixing groove is provided on the seat body, a plurality of pin shaft holes are evenly arranged around the limit plate, a plurality of pin shafts are inserted in the plurality of pin shaft holes, the pin shafts are fitted with the groove walls of the limit plate fixing groove, the pin shafts are arranged to slide along the limit plate fixing groove, the limit groove is provided on the limit plate, the limit column is provided on the knob, the limit column slides in the limit groove, when the knob is rotated, the limit column moves from one end of the limit groove to the other end of the limit groove, and the limit plate adjustment mechanism can adjust the relative angle between the limit plate and the knob to realize the adjustment of the rotation angle of the knob.

[0008] According to some embodiments of the present invention, the limit plate adjustment mechanism includes a plurality of locking grooves, a hinge, a locking block, a first compression spring and a first spring seat, a plurality of the locking grooves are arranged on the outer periphery of the limit plate, the hinge is hinged to the seat body, the locking block is arranged on the hinge, and the locking block can be accommodated in the locking grooves, there are two first spring seats, and the two first spring seats are respectively arranged on the seat body and the hinge, the two ends of the first compression spring are respectively mounted on the two first spring seats, and the first spring seat drives the hinge to rotate so that the locking block is locked in the locking groove.

[0009] According to some embodiments of the present invention, the lower pressure block includes a threaded connection block, a pressure block body and a guide sleeve, the threaded connection block is threadedly connected to the screw rod, the pressure block body is sleeved on the threaded connection block, the guide sleeve is covered on the pressure block body, and the pressure block body is configured to contact the chip.

[0010] According to some embodiments of the present invention, the pressing block body has an extension portion extending out of the guide sleeve, and the extension portion is provided with an air guide groove.

[0011] According to some embodiments of the present invention, the threaded connection block and the guide sleeve are made of metal materials, the pressing block body is made of rubber, and the pressing block body, the threaded connection block and the guide sleeve are bonded.

[0012] According to some embodiments of the present invention, a chip slot is provided at the center of the adapter plate, and a slope is provided around the chip slot.

[0013] According to some embodiments of the present invention, a chip pressing seat locking mechanism is further included, and the chip pressing seat locking mechanism is configured to lock the connection frame and the chip pressing seat.

[0014] According to some embodiments of the present invention, the chip pressing seat locking mechanism includes a hinge plate, a second spring seat, a second compression spring, a hanging plate and a hook, the hinge plate is hinged to the seat body, the second spring seat is divided into two groups, the two groups of second spring seats are respectively arranged on the seat body and the hinge plate, the two ends of the second compression spring are respectively mounted on the two second spring seats, the hook is arranged at one end of the hinge plate, the hanging plate is arranged on the connecting frame, the hook is configured to be hung with the hanging plate, and pressing the end of the hinge plate away from the hook can tend to separate the hook from the hanging plate.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0017] Figure 1 The structure of the preferred embodiment of the present invention is shown in FIG. Figure 1 ;

[0018] Figure 2 The structure of the preferred embodiment of the present invention is shown in FIG. Figure 2 ;

[0019] Figure 3 A top view of a preferred embodiment of the present invention;

[0020] Figure 4 for Figure 3 Cross-sectional view of section AA (test plate omitted);

[0021] Figure 5 for Figure 3 Cross-sectional view of the middle BB section;

[0022] Figure 6 This is a schematic diagram of the structure of the adapter board of a preferred embodiment of the present invention;

[0023] Figure 7 This is a structural schematic diagram of a connection frame of a preferred embodiment of the present invention;

[0024] Figure 8 This is a schematic diagram of the structure of a knob in a preferred embodiment of the present invention;

[0025] Fig. 9 It is a schematic structural diagram of a limiting plate according to a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0026] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0027] In the description of the present invention, if there is a description of first and second, it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0028] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0029] Reference Figures 1 to 9 A chip test fixture includes an adapter plate 10, a connecting frame 20 and a chip pressing seat 30. The adapter plate 10 is arranged on the chip test board. The connecting frame 20 is detachably arranged on the adapter plate 10. The chip pressing seat 30 is hinged to one side of the connecting frame 20, and the positive projection of the chip pressing seat 30 on the adapter plate 10 coincides with the connecting frame 20.

[0030] It is understandable that the use process of the embodiment of the present invention is as follows:

[0031] The fixture installation process: first place the adapter board 10 on the chip test board, then fix the adapter board 10 and the chip test board with fasteners, and then use fasteners to connect and fix the connecting frame 20 and the adapter board 10 to complete the installation of the fixture.

[0032] The chip pressing seat 30 includes a seat body 31, a pressing block 32 and a pressing driving assembly 33. The pressing driving assembly drives the pressing block 32 to rise or fall in a vertical direction. The pressing block 32 presses the chip onto the test board.

[0033] The chip pressing seat 30 further includes a stroke adjustment component 34. The stroke adjustment component 34 can adjust the maximum stroke of the lower pressing block 32 so that the chip is not crushed.

[0034] Chip testing process: Place the chip into the connecting frame 20, then fasten the chip clamping seat 30 to the connecting frame, and then use the downward pressing drive component 33 to drive the downward pressing block 32 to press down. After completing the chip pressing and testing work, reset the downward pressing drive component 33 and open the chip clamping seat 30, take out the chip, and put in the next chip to be tested.

[0035] It is worth noting that if the size of the chip to be tested does not change, but the thickness changes, the pressing stroke of the pressing block 32 can be adjusted by the stroke adjustment component 34 to avoid damaging the chip or failing to press the chip.

[0036] Reference Figures 1 to 4 The downward pressure driving assembly 33 includes a guide groove 331, a screw rod 332, an adapter plate 333 and a knob 334. The guide groove 331 is provided on the seat body 31. The downward pressure block 32 is arranged in the guide groove 331 so as to be liftable. A thread groove is provided on the downward pressure block 32. The axis of the thread groove is parallel to the vertical direction. The screw rod 332 is screwed in the thread groove. An adapter plate receiving groove 311 is also provided on the seat body 31. The adapter plate receiving groove 311 is connected to the guide groove 331. The adapter plate receiving groove 311 is located above the guide groove 331. The adapter plate 333 is fixed at the end of the screw rod 332. The knob 334 is rotatably arranged on the seat body 31. The knob 334 is connected to the adapter plate 333 by a screw. The adapter plate 333 abuts against the upper edge of the adapter plate receiving groove 311. When the knob 334 rotates. The transfer plate 333 and the screw rod 332 rotate along with the knob 334. The lower pressing block 32 rises or falls along the guide groove 331 when the screw rod 332 rotates.

[0037] In an embodiment of the present invention, the knob 334 and the adapter plate 333 are connected by screws, and the adapter plate 333 is fixed at the end of the screw rod 332. The rotation of the knob 334 can drive the screw rod 332 to rotate through the adapter plate 333. The screw rod 332 is screwed in the lower pressure block 32, and the vertical freedom of the lower pressure block 32 is not restricted. Therefore, the rotation of the screw rod 332 will drive the lower pressure block 32 to rise and fall, thereby realizing the function of clamping the chip.

[0038] Furthermore, the angle of the knob 334 that needs to be rotated for the stroke of the lower pressing block 32 can be accurately calculated by the pitch of the screw rod 332. The stroke adjustment component 34 can adjust the rotation angle of the knob 334 to achieve stroke adjustment of the lower pressing block 32.

[0039] Reference Figures 1 to 5 , the stroke adjustment assembly 34 includes a limit plate 341, a limit groove 342, a limit column 343 and a limit plate adjustment mechanism 344. The limit plate 341 is rotatably sleeved on the seat body 31. A limit plate fixing groove 312 is provided on the seat body 31. The limit plate 341 is evenly provided with a plurality of pin holes 341a in the circumferential direction. A plurality of pins 341b are inserted into the plurality of pin holes 341a. The pins 341b are fitted with the groove wall of the limit plate fixing groove 312. The pins 341b are arranged to slide along the limit plate fixing groove 312. The limit groove 342 is provided on the limit plate 341. The limit column 343 is arranged on the knob 334. The limit column 343 slides in the limit groove 342. When the knob 334 is turned, the limit column 343 moves from one end of the limit groove 342 to the other end of the limit groove 342. The limit plate adjustment mechanism 344 can adjust the relative angle between the limit plate 341 and the knob 334 to adjust the rotation angle of the knob 334 .

[0040] Reference Figures 1 to 5 The limiting plate adjustment mechanism 344 includes a plurality of snap-in grooves 344a, a hinge 344b, a snap-in block 344c, a first compression spring 344d and a first spring seat 344e. The plurality of snap-in grooves 344a are arranged on the periphery of the limiting plate 341. The hinge 344b is hinged to the seat body 31. The snap-in block 344c is arranged on the hinge 344b. The snap-in block 344c can be accommodated in the snap-in groove 344a. There are two first spring seats 344e, and the two first spring seats 344e are respectively arranged on the seat body 31 and the hinge 344b. The two ends of the first compression spring 344d are respectively sleeved on the two first spring seats 344e. The first spring seat 344e drives the hinge 344b to rotate so that the snap-in block 344c is snapped into the snap-in groove 344a.

[0041] It can be understood that the limit plate 341 can rotate on the base body 31, and the limit groove 342 on the limit plate 341 is an incomplete annular groove. When the knob 334 is rotated to a certain angle, the limit column 343 under the knob 334 will abut against the end of the limit groove 342, so that the screw rod 332 cannot rotate and drive the lower pressure block 32 to press the chip downward.

[0042] When the chip thickness changes, the hinge 344b can be pressed to separate the locking block 344c from the current locking slot 344a and switch to other locking slots 344a, so that the position of the limiting slot 342 on the limiting plate 341 changes, and the maximum and minimum rotation angles of the knob 334 change, thereby realizing the stroke adjustment of the lower pressure block 32.

[0043] Reference Figure 3 to Figure 4The lower pressing block 32 includes a threaded connection block 321, a pressing block body 322 and a guide sleeve 323. The threaded connection block 321 is threadedly connected to the screw rod 332. The pressing block body 322 is sleeved on the threaded connection block 321. The guide sleeve 323 is covered on the pressing block body 322. The pressing block body 322 is configured to contact the chip.

[0044] It is worth noting that, in some embodiments of the present invention, the threaded connection block 321 and the guide sleeve 323 are made of metal materials, the pressing block body 322 is made of rubber, and the pressing block body 322, the threaded connection block 321 and the guide sleeve 323 are bonded.

[0045] It is worth noting that, in some embodiments of the present invention, the lower pressing block 32 is formed by polyurethane and has good self-lubricating properties.

[0046] It is worth noting that in some other embodiments of the present invention, the lower pressing block 32 is formed by bonding three parts: a threaded connection block 321, a pressing block body 322, and a guide sleeve 323. The threaded connection block 321 is made of metal with high structural strength to avoid thread creep. The guide sleeve 323 that rubs against the guide groove 331 is made of wear-resistant metal, such as copper. The pressing block body 322 that contacts the chip is made of rubber.

[0047] Reference Figure 3 to Figure 4 The pressing block body 322 has an extension portion 322a extending out of the guide sleeve 323. The extension portion 322a is provided with an air guide groove 322b.

[0048] It is worth noting that if the contact surface between the pressing block body 322 and the chip is uneven, a cavity is likely to be generated. In this case, the air needs to be discharged through the air guide groove 322b to compact the chip.

[0049] Reference Figure 3 to Figure 4 A chip slot 11 is provided at the center of the adapter plate 10. An inclined surface 12 is provided around the chip slot 11.

[0050] It is worth noting that a slope 12 is arranged around the chip slot 11. If the position where the chip is placed is offset, the chip will slide along the slope 12 into the chip slot 11 under the action of gravity. The slope 12 has a certain positioning function.

[0051] Reference Figure 3 to Figure 4 A chip test fixture further includes a chip pressing seat locking mechanism 40. The chip pressing seat locking mechanism 40 is configured to lock the connection frame 20 and the chip pressing seat 30.

[0052] Reference Figure 3 to Figure 4The chip pressing seat locking mechanism 40 includes a hinge plate 41, a second spring seat 42, a second compression spring 43, a hanging plate 44 and a hook 45. The hinge plate 41 is hinged to the seat body 31, and the second spring seat 42 is in two groups. The two groups of second spring seats 42 are respectively arranged on the seat body 31 and the hinge plate 41. The two ends of the second compression spring 43 are respectively sleeved on the two second spring seats 42. The hook 45 is arranged at one end of the hinge plate 41. The hanging plate 44 is arranged on the connecting frame 20. The hook 45 is configured to hang with the hanging plate 44. Pressing one end of the hinge plate 41 away from the hook 45 can separate the hook 45 from the hanging plate 44.

[0053] It should be noted that before chip testing, the chip pressing seat 30 can be locked and fixed with the connecting frame 20 through the chip pressing seat locking mechanism 40 to avoid detection errors leading to detection failures and affecting the chip yield.

[0054] In the embodiment of the present invention, locking is achieved by hooking the hook 45 with the hook plate 44. When unlocking is required, the end of the hinge plate 41 away from the hook 45 is pressed, and the hook 45 is separated from the hook plate 44 to complete unlocking. When locking is required, the second compression spring 43 can push one end of the hinge plate 41 to prevent the hook 45 from separating from the hook plate 44. The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of the technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0055] Of course, the present invention is not limited to the above-mentioned embodiments, and those skilled in the art may make equivalent modifications or substitutions without violating the spirit of the present invention, and these equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A chip testing fixture, characterized in that: include: An adapter board (10), wherein the adapter board (10) is arranged on a chip testing board; A connecting frame (20), the connecting frame (20) being detachably arranged on the adapter plate (10); A chip pressing seat (30), the chip pressing seat (30) being hinged to one side of the connecting frame (20), and the orthographic projection of the chip pressing seat (30) on the adapter plate (10) coincides with the connecting frame (20); The chip pressing seat (30) comprises: a seat body (31), a pressing block (32) and a pressing drive assembly (33), wherein the pressing drive assembly drives the pressing block (32) to rise or fall in a vertical direction, and the pressing block (32) presses the chip onto the test board; The chip pressing seat (30) further comprises a stroke adjustment component (34), wherein the stroke adjustment component (34) is capable of adjusting the maximum stroke of the lower pressing block (32) so that the chip is not crushed; The stroke adjustment assembly (34) comprises a limit plate (341), a limit groove (342), a limit column (343) and a limit plate adjustment mechanism (344); the limit plate (341) is rotatably sleeved on the seat body (31); a limit plate fixing groove (312) is provided on the seat body (31); a plurality of pin holes (341a) are evenly arranged on the limit plate (341) in a circumferential direction; a plurality of pins (341b) are inserted into the plurality of pin holes (341a); the pins (341b) are in contact with the groove wall of the limit plate fixing groove (312); and the pins (341b) are arranged In order to slide along the limiting plate fixing groove (312), the limiting groove (342) is opened on the limiting plate (341), the limiting column (343) is arranged on the knob (334), and the limiting column (343) slides in the limiting groove (342). When the knob (334) is rotated, the limiting column (343) moves from one end of the limiting groove (342) to the other end of the limiting groove (342), and the limiting plate adjustment mechanism (344) can adjust the relative angle between the limiting plate (341) and the knob (334) to achieve the adjustment of the rotation angle of the knob (334).

2. A chip testing fixture according to claim 1, characterized in that: The pressing-down driving assembly (33) comprises a guide groove (331), a screw rod (332), an adapter plate (333) and the knob (334); the guide groove (331) is provided on the seat body (31); the pressing-down block (32) is arranged in the guide groove (331) so as to be liftable; a thread groove is provided on the pressing-down block (32); the axis of the thread groove is parallel to the vertical direction; the screw rod (332) is screwed in the thread groove; the seat body (31) is further provided with an adapter plate accommodating groove (311); the adapter plate accommodating groove (311) is communicated with the guide groove (331); the adapter plate accommodating groove (311) is arranged in a vertical direction; ) is located above the guide groove (331), the adapter plate (333) is fixedly arranged at the end of the screw rod (332), the knob (334) is rotatably arranged on the base (31), the knob (334) is connected to the adapter plate (333) by a screw, and the adapter plate (333) abuts against the upper edge of the adapter plate accommodating groove (311), when the knob (334) rotates, the adapter plate (333) and the screw rod (332) rotate along with the knob (334), and the lower pressing block (32) rises or falls along the guide groove (331) when the screw rod (332) rotates.

3. A chip testing fixture according to claim 2, characterized in that: The limit plate adjustment mechanism (344) comprises a plurality of locking grooves (344a), a hinge (344b), a locking block (344c), a first compression spring (344d) and a first spring seat (344e); the plurality of locking grooves (344a) are arranged on the periphery of the limit plate (341); the hinge (344b) is hinged to the seat body (31); the locking block (344c) is arranged on the hinge (344b); and the locking block (344c) can accommodate In the locking groove (344a), there are two first spring seats (344e), the two first spring seats (344e) are respectively arranged on the seat body (31) and the hinge (344b), the two ends of the first compression spring (344d) are respectively sleeved on the two first spring seats (344e), and the first spring seat (344e) drives the hinge (344b) to rotate so that the locking block (344c) is locked into the locking groove (344a).

4. A chip testing fixture according to claim 2, characterized in that: The lower pressing block (32) comprises a threaded connection block (321), a pressing block body (322) and a guide sleeve (323); the threaded connection block (321) is threadedly connected to the screw rod (332); the pressing block body (322) is sleeved on the threaded connection block (321); the guide sleeve (323) is covered on the pressing block body (322); and the pressing block body (322) is configured to contact the chip.

5. A chip testing fixture according to claim 4, characterized in that: The pressing block body (322) has an extension portion (322a) extending out of the guide sleeve (323), and an air guide groove (322b) is provided on the extension portion (322a).

6. A chip testing fixture according to claim 4, characterized in that: The threaded connection block (321) and the guide sleeve (323) are made of metal material, the pressing block body (322) is made of rubber, and the pressing block body (322), the threaded connection block (321) and the guide sleeve (323) are bonded together.

7. A chip testing fixture according to claim 1, characterized in that: A chip slot (11) is provided at the centre of the adapter plate (10), and an inclined surface (12) is provided in the circumferential direction of the chip slot (11).

8. A chip testing fixture according to claim 1, characterized in that: It also includes a chip pressing seat locking mechanism (40), wherein the chip pressing seat locking mechanism (40) is configured to lock the connection frame (20) and the chip pressing seat (30).

9. A chip testing fixture according to claim 8, characterized in that: The chip clamping seat locking mechanism (40) comprises a hinge plate (41), a second spring seat (42), a second compression spring (43), a hanging plate (44) and a hook (45), wherein the hinge plate (41) is hinged to the seat body (31), the second spring seat (42) is divided into two groups, and the two groups of the second spring seats (42) are respectively arranged on the seat body (31) and the hinge plate (41), and the two ends of the second compression spring (43) are respectively sleeved on the two second spring seats (42), the hook (45) is arranged at one end of the hinge plate (41), and the hanging plate (44) is arranged on the connecting frame (20), and the hook (45) is configured to be hung with the hanging plate (44), and pressing the end of the hinge plate (41) away from the hook (45) can cause the hook (45) to separate from the hanging plate (44).

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