A forward and reverse multi-functional self-locking sling length adjuster

Abstract

This invention discloses a forward and reverse multi-functional self-locking sling length adjuster, belonging to the technical field of sling length adjusters. It solves the problems of sling length inability to be adjusted during lifting and the inability to achieve self-locking after adjustment. Specifically, it includes a fixed outer frame with a pin inside, and a frame body movably connected to the pin. The frame body includes a roller sleeved on the pin. The roller has an installation cavity containing a central friction block. A groove is formed on the outer side of the roller, and a fixing plate is installed within the groove. In this invention, when the sling is not taut, the frame body can be rotated forward or backward to allow the sling to wrap around it, achieving sling length adjustment; the operation is simple. When lifting heavy objects, the sling is taut, and the portion of the sling wrapped around the roller is pressed against the roller and squeezes the central friction block, causing the central friction block to press inward against the pin, generating friction and preventing relative rotation between the pin and the frame body, thus achieving self-locking.

Description

Technical Field

[0001] This invention relates to the field of sling length adjuster technology, and more particularly to a forward and reverse multi-functional self-locking sling length adjuster. Background Technology

[0002] Because aircraft assemblies consist of numerous and complex components, and because the disassembly and assembly of these components must prevent interference with or collisions with objects on the aircraft, vertical lifting is necessary at the assembly location. However, the presence, quantity, and location of accessories such as oil, connecting pipes, and cable harnesses among the components being lifted are uncertain, leading to a discrepancy between the theoretical and actual center of gravity of the lifted load. This uncertainty makes the lifted load prone to unpredictable tilting during the lifting process. To address this uncertainty, the sling length needs to be adjusted based on trial lifts to achieve the desired length. This requires the sling to have the ability to automatically lock into position under load, ensuring that the center of gravity of the lifted load is aligned vertically with the hook, preventing tilting, rolling, and maintaining a stable vertical lifting posture.

[0003] Currently, slings used for aircraft ground maintenance are typically made of steel wire rope or synthetic fibers. This method results in slings of fixed length, making length adjustment difficult, and locking the sling after adjustment under stress is also challenging. Therefore, this invention provides a sling length adjuster that allows for sling length adjustment and self-locking after adjustment. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a forward and reverse multi-functional self-locking sling length adjuster, which solves the problems of the inability to adjust the sling length during lifting and the inability to achieve self-locking after adjustment.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A multi-functional self-locking sling length adjuster for both forward and reverse rotation includes a fixed outer frame, inside which a pin is installed, and a frame body is movably connected to the pin. Two outer edge friction blocks are respectively installed at the top and bottom of the frame body. The frame body includes a roller, which is sleeved on the pin. Several through-hole mounting cavities are opened on the roller, and a central friction block is installed in each cavity. A groove is opened on the outer side of the roller, and a fixing plate is installed in the groove. The sling enters from the top of the fixed outer frame, then passes around the groove between the roller and the fixing plate, and finally exits from the bottom of the fixed outer frame.

[0007] In this solution, when adjusting the sling length, the frame can be rotated directly in either the forward or reverse direction while the sling is not under stress or taut, allowing the sling to wrap around the frame and thus adjusting the sling length. Once adjusted, the sling length can be maintained. During adjustment, workers can directly observe and perceive the adjustment effect visually, making the operation simple. When the sling lifts a heavy object, it is taut under stress. At this time, the portion of the sling wrapped around the roller is close to the roller and presses against one or more central friction blocks. This causes the central friction blocks to retract inward, pressing against the pin, generating friction between the pin and the frame, preventing relative rotation between the pin and the frame, thus achieving self-locking—the first type of self-locking. In actual operation, the sling length is adjusted and locked based on the trial lift results, ensuring the center of gravity of the lifted object is on a vertical line with the hook, guaranteeing vertical lifting of the object.

[0008] Furthermore, the fixed outer frame includes two support plates, which are respectively set on both sides of the roller and fixedly connected to both ends of the pin shaft; a top guide frame is connected to the top of the two support plates, and a bottom guide frame is connected to the bottom of the two support plates; both the top guide frame and the bottom guide frame have guide holes in the middle for the sling to pass through.

[0009] In this design, the sling enters through the guide hole of the top guide frame and exits through the guide hole of the bottom guide frame; the top and bottom guide frames guide the sling, ensuring that the portion of the sling before entering the top guide frame and the portion after exiting the bottom guide frame are on a vertical line; at the same time, it ensures that the portion of the sling that is in close contact with the roller can be squeezed against at least one central friction block.

[0010] Furthermore, the frame also includes a front baffle and a rear baffle, which are respectively connected to both ends of the roller;

[0011] The outer edge friction block includes a deflection frame, with two external friction components connected to each side of the deflection frame. The deflection frame laterally abuts against the outer circumference of the front and rear baffles. The two ends of the deflection frame are movably connected to two support plates. The sling passes through the strip hole in the middle of the deflection frame. When the sling drives the deflection frame to deflect, the deflection frame rubs against the outer circumference of the front and rear baffles.

[0012] In this design, the sling enters through the guide hole of the top guide frame, passes through the top deflector frame, goes around the roller, exits through the bottom deflector frame, and finally exits through the guide hole of the bottom guide frame. When lifting heavy objects, the sling is taut, and the force on the sling is transmitted to the two deflector frames at the top and bottom. The sling causes the deflector frames to deflect relative to the position where they are movably connected to the support plate. After deflection, the inner side of the deflector frame rubs against the outer circumference of the front and rear baffles, preventing the pin from rotating relative to the frame body, thus achieving self-locking and realizing the second type of self-locking.

[0013] Furthermore, the ends of the external friction components are designed with bevels; when the deflection frame deflects, it causes the ends of the two external friction components to squeeze into the gap between the front baffle and the support plate and the gap between the rear baffle and another support plate, respectively, generating friction.

[0014] In this scheme, when lifting heavy objects, the sling causes the deflection frame to deflect. At the same time as the deflection, the end of the external friction component is squeezed into the gap between the frame body and the support plate. The friction prevents the frame body from rotating, thus achieving the purpose of self-locking and realizing the third type of self-locking.

[0015] Furthermore, the ends of the guide holes in the middle of the top guide frame and the bottom guide frame are provided with openings;

[0016] An opening is provided in the middle of the strip hole in the deflection frame.

[0017] In this design, openings are provided on both the top guide frame and the deflection frame to facilitate the insertion of the lifting straps.

[0018] Furthermore, a fan-shaped notch is provided on the front baffle of the frame body, and a fan-shaped baffle can be detachably installed at the notch position.

[0019] In this design, the fan-shaped baffle is detachable and can be opened when the sling is inserted, guiding the sling from the side to pass around the groove between the roller and the fixed plate.

[0020] Furthermore, the frame body also includes a front rotating sleeve and a rear rotating sleeve. The front rotating sleeve is fitted onto the end of the roller near the front baffle, and the rear rotating sleeve is fitted onto the end of the roller near the rear baffle. The pin passes through the middle of the front rotating sleeve and the rear rotating sleeve.

[0021] The edge of the front rotating sleeve has a fan-shaped notch, and the bottom of the fan-shaped baffle is embedded in the notch of the edge of the front rotating sleeve.

[0022] Furthermore, the sector-shaped baffle is fixed by two rows of first screws. The first row of first screws passes through the sector-shaped baffle and is threaded onto the fixed plate, while the second row of first screws passes through the sector-shaped baffle and is threaded onto the roller.

[0023] The front rotating sleeve is fixed to the roller by three circumferentially distributed second screws; the topmost second screw is threaded through the fan-shaped baffle and connected to the roller.

[0024] In this design, the fan-shaped baffle is connected to the fixed plate and the roller respectively by two rows of first screws, and the assembled frame forms a stable whole; the design of the front rotating sleeve and the rear rotating sleeve realizes the rotational connection between the roller and the pin.

[0025] Furthermore, both ends of the top guide frame and the bottom guide frame are provided with connecting ears; the connecting ears at both ends of the top guide frame are respectively connected to the top of the two support plates by a third screw; the connecting ears at both ends of the bottom guide frame are respectively connected to the bottom of the two support plates by a third screw.

[0026] A fourth screw is also provided on the support plate, which passes through the support plate and is connected to the middle of the outer edge friction block.

[0027] Furthermore, the roller has three equally spaced mounting cavities, and three central friction blocks are installed in each of the three mounting cavities.

[0028] The beneficial effects of this invention are:

[0029] The forward and reverse multi-functional self-locking sling length adjuster provided by this invention allows for sling length adjustment when the sling is not under stress or taut. The frame can be rotated directly in either the forward or reverse direction to allow the sling to wrap around the frame, thus achieving sling length adjustment. The operation is simple.

[0030] After length adjustment, the system possesses three self-locking functions when lifting heavy objects. First, when lifting a heavy object, the sling is taut under force. At this time, the portion of the sling wrapped around the roller is tightly pressed against the roller, squeezing one or more central friction blocks. This causes the central friction blocks to retract inward and press against the pin, generating friction between them and preventing relative rotation between the pin and the frame, thus achieving self-locking. Second, because the sling is taut when lifting a heavy object, the force on the sling is transmitted to the two deflecting frames at the top and bottom. The sling causes the deflecting frames to deflect relative to their movable connection with the support plate. After deflection, the inner side of the deflecting frame rubs against the outer circumference of the front and rear baffles, preventing relative rotation between the pin and the frame, thus achieving self-locking. Third, as the sling deflects the deflecting frames, the end of the outer friction component squeezes into the gap between the frame and the support plate, using friction to prevent rotation of the frame, thus achieving self-locking. Attached Figure Description

[0031] Figure 1 This is an exploded view of a forward and reverse multi-functional self-locking sling length adjuster according to the present invention;

[0032] Figure 2 This is a schematic diagram of the forward and reverse multi-functional self-locking sling length adjuster in the first winding state of the present invention;

[0033] Figure 3 This is a front view of the forward and reverse multi-functional self-locking sling length adjuster in the first winding state;

[0034] Figure 4 for Figure 3 Cross-sectional view of section BB in the middle;

[0035] Figure 5 This is a schematic diagram of the forward and reverse multi-functional self-locking sling length adjuster in the second winding state of the present invention;

[0036] Figure 6 This is a front view of the forward and reverse multi-functional self-locking sling length adjuster in the second winding state;

[0037] Figure 7 for Figure 6 Cross-sectional view of section AA.

[0038] Figure label:

[0039] 1. Pin; 2. Frame body; 21. Roller; 22. Front baffle; 23. Rear baffle; 24. Fixing plate; 25. Fan-shaped baffle; 26. Front rotating sleeve; 27. Rear rotating sleeve; 3. Outer edge friction block; 31. Deflection frame; 32. Outer friction component; 4. Sling; 51. Support plate; 52. Top guide frame; 53. Bottom guide frame; 61. First screw; 62. Second screw; 63. Third screw; 64. Fourth screw; 7. Center friction block; Detailed Implementation

[0040] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Specific embodiments of the present invention are described below to facilitate understanding by those skilled in the art. However, it should be understood that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, various modifications are obvious as long as they fall within the spirit and scope of the present invention as defined and determined by the appended claims. All inventions utilizing the concept of the present invention are protected.

[0041] like Figure 1 As shown, this embodiment provides a forward and reverse multi-functional self-locking sling length adjuster. This forward and reverse multi-functional self-locking sling length adjuster can adjust the sling length and achieve self-locking after adjustment; specifically, it includes:

[0042] Pin 1, frame 2, outer edge friction block 3, and center friction block 7;

[0043] The fixed outer frame contains a pin 1, to which a frame body 2 is movably connected. Two outer edge friction blocks 3 are respectively provided at the top and bottom of the frame body 2. The frame body 2 includes a roller 21, a front baffle 22, and a rear baffle 23, with the front baffle 22 and rear baffle 23 respectively connected to both ends of the roller 21. The roller 21 is fitted onto the pin 1. Three through-hole mounting cavities are provided on the roller 21, each housing a central friction block 7, the end of which abuts against the pin 1. A groove is provided on the outer side of the roller 21, within which a fixing plate 24 is installed. A sling 4 enters from the top of the fixed outer frame, passes around the groove between the roller 21 and the fixing plate 24, and finally exits from the bottom of the fixed outer frame.

[0044] The fixed outer frame includes two support plates 51, a top guide frame 52, and a bottom guide frame 53. The two support plates 51 are respectively disposed on both sides of the roller 21 and are fixedly connected to both ends of the pin shaft 1. The top guide frame 52 is connected to the top of the two support plates 51, and the bottom guide frame 53 is connected to the bottom of the two support plates 51. The top guide frame 52 and the bottom guide frame 53 are both provided with guide holes for the sling 4 to pass through. The sling 4 passes through the guide hole of the top guide frame 52 and exits through the guide hole of the bottom guide frame 53. The top guide frame 52 and the bottom guide frame 53 guide the sling 4, ensuring that the part of the sling 4 before entering the top guide frame 52 and the part after exiting the bottom guide frame 53 are on the same vertical line. At the same time, it ensures that the part of the sling 4 that is in close contact with the roller 21 can press against at least one central friction block 7.

[0045] The outer edge friction block 3 includes a deflection frame 31 and two outer friction elements 32; the two outer friction elements 32 are respectively connected to the two sides of the deflection frame 31; the deflection frame 31 is laterally abutted against the outer edge of the front baffle 22 and the rear baffle 23, and the two ends of the deflection frame 31 are movably connected to two support plates 51 respectively, and the sling 4 passes through the strip hole in the middle of the deflection frame 31. After the sling 4 enters through the guide hole of the top guide frame 52, it first passes through the top deflector frame 31, then around the roller 21, then out through the bottom deflector frame 31, and finally out through the guide hole of the bottom guide frame 53. When lifting heavy objects, the sling 4 is in a taut state. The force on the sling 4 is transmitted to the two deflector frames 31 at the top and bottom. The sling 4 causes the deflector frame 31 to deflect relative to the position where it is movably connected to the support plate 51. After deflection, the inner side of the deflector frame 31 rubs against the outer circumference of the front baffle 22 and the rear baffle 23, preventing the pin 1 from rotating relative to the frame body 2, thus achieving self-locking and realizing the second type of self-locking.

[0046] The ends of the external friction components 32 are designed with bevels. When the deflecting frame 31 deflects, the ends of the two external friction components 32 are respectively squeezed into the gaps between the front baffle 22 and the support plate 51 and the gap between the rear baffle 23 and another support plate 51 to generate friction. When lifting heavy objects, the sling 4 drives the deflecting frame 31 to deflect. At the same time as the deflection, the ends of the external friction components 32 are squeezed into the gaps between the frame body 2 and the support plate 51, using friction to prevent the frame body 2 from rotating, thus achieving self-locking and realizing the third type of self-locking.

[0047] The top guide frame 52 and the bottom guide frame 53 have openings at the ends of the guide holes in the middle, and the deflection frame 31 has an opening in the middle of the strip hole in the middle, so that the sling 4 can be inserted.

[0048] The front baffle 22 of the frame body 2 has a fan-shaped notch, and a fan-shaped baffle 25 can be detachably installed at the notch position. When the sling 4 is inserted, the fan-shaped baffle 25 is opened, and the sling 4 is guided from the side to pass around the groove between the roller 21 and the fixing plate 24.

[0049] The frame body 2 also includes a front rotating sleeve 26 and a rear rotating sleeve 27. The front rotating sleeve 26 is sleeved on the end of the roller 21 near the front baffle 22, and the rear rotating sleeve 27 is sleeved on the end of the roller 21 near the rear baffle 23. The pin 1 passes through the middle of the front rotating sleeve 26 and the rear rotating sleeve 27. The edge of the front rotating sleeve 26 is provided with a fan-shaped notch, and the bottom of the fan-shaped baffle 25 is embedded in the notch on the edge of the front rotating sleeve 26.

[0050] The sector-shaped baffle 25 is fixed by two rows of first screws 61, each of which is equipped with a spring washer. The first row of first screws 61 passes through the sector-shaped baffle 25 and is threaded onto the fixed plate 24. The second row of first screws 61 passes through the sector-shaped baffle 25 and is threaded onto the roller 21. The sector-shaped baffle 25 is connected to the fixed plate 24 and the roller 21 by the two rows of first screws 61 respectively. After assembly, the frame body 2 forms a stable whole.

[0051] The front rotating sleeve 26 is fixed to the roller 21 by three circumferentially distributed second screws 62, and spring washers are provided on the second screws 62; the topmost second screw 62 passes through the fan-shaped baffle 25 and is threaded onto the roller 21.

[0052] Both ends of the top guide frame 52 and the bottom guide frame 53 are provided with connecting ears; the connecting ears at both ends of the top guide frame 52 are respectively connected to the top of the two support plates 51 by the third screw 63; the connecting ears at both ends of the bottom guide frame 53 are respectively connected to the bottom of the two support plates 51 by the third screw 63, and a spring washer is provided on the third screw 63.

[0053] A fourth screw 64 is also provided on the support plate 51. The fourth screw 64 passes through the support plate 51 and is connected to the middle of the outer edge friction block 3. A spring washer and a flat washer are provided on the fourth screw 64.

[0054] The roller 21 has three equally spaced mounting cavities, and three central friction blocks 7 are installed in the three mounting cavities respectively.

[0055] The working principle of this embodiment is as follows:

[0056] In this embodiment, the forward and reverse multi-functional self-locking sling 4 length adjuster adjusts the length of the sling 4 by directly rotating the frame 2 in either the forward or reverse direction when the sling 4 is not under force and is not taut, so that the sling 4 is wrapped around the frame 2, thereby achieving the adjustment of the sling 4 length.

[0057] like Figure 2 and Figure 3 As shown, Figure 2 and Figure 3 This is a schematic diagram of the sling 4 in the first winding state; in this state, the length of the sling 4 wound on the roller 21 is relatively short, such as... Figure 4 As shown.

[0058] like Figure 5 and Figure 6 As shown, Figure 5 and Figure 6 This is a schematic diagram of the sling 4 in the second winding state; in this state, the length of the sling 4 wound on the roller 21 is relatively long, such as... Figure 7 As shown.

[0059] After length adjustment, it possesses three self-locking functions when lifting heavy objects. When lifting a heavy object, the sling 4 is taut under force. At this time, the portion of the sling 4 wrapped around the roller 21 is tightly pressed against the roller 21, squeezing one or more central friction blocks 7. This causes the central friction blocks 7 to move inward and press against the pin 1, generating friction between them and preventing relative rotation between the pin 1 and the frame 2, thus achieving self-locking, realizing the first type of self-locking. Because the sling 4 is taut when lifting a heavy object, the force on the sling 4 is transmitted to the two deflection frames 31 at the top and bottom. 4. The deflection frame 31 is deflected relative to the position where it is movably connected to the support plate 51. After deflection, the inner side of the deflection frame 31 rubs against the outer circumference of the front baffle 22 and the rear baffle 23, preventing the pin 1 from rotating relative to the frame body 2, thus achieving self-locking and realizing the second type of self-locking. The sling 4 drives the deflection frame 31 to deflect. At the same time as the deflection, the end of the outer friction element 32 is squeezed into the gap between the frame body 2 and the support plate 51, using friction to prevent the frame body 2 from rotating, thus achieving self-locking and realizing the third type of self-locking.

[0060] Those skilled in the art will recognize that the embodiments described herein are intended to help the reader understand the principles of the invention and should be understood as not limiting the scope of protection of the invention to such specific statements and embodiments. Those skilled in the art can make various other specific modifications and combinations based on the technical teachings disclosed herein without departing from the spirit of the invention, and these modifications and combinations are still within the scope of protection of the invention.

Claims

1. A reversible multi-functional self-locking type sling length adjuster, characterized by: The utility model provides a fixed outer frame, the fixed outer frame is internally provided with a pin shaft (1), the pin shaft (1) is movably connected with frame body (2), the top and bottom of frame body (2) are provided with two outer edge friction blocks (3) respectively, frame body (2) includes roller (21), the roller (21) is sleeved on the pin shaft (1), a plurality of through installation cavities are formed in the roller (21), and each installation cavity is provided with a center friction block (7) respectively, the outer side of roller (21) is provided with a recess, and the recess is provided with a fixed plate (24), a sling (4) is inserted from the top of fixed outer frame, then passes through the recess between roller (21) and fixed plate (24), and finally is taken out from the bottom of fixed outer frame, The fixed outer frame includes two supporting plates (51), the two supporting plates (51) are arranged on the two sides of the roller (21) respectively, and the two supporting plates (51) are fixedly connected with the two ends of the pin shaft (1) respectively, the top of the two supporting plates (51) is connected with a top guide frame (52), the bottom of the two supporting plates (51) is connected with a bottom guide frame (53), and the middle parts of the top guide frame (52) and the bottom guide frame (53) are provided with guide holes for the sling (4) to pass through. The frame body (2) further includes a front baffle (22) and a rear baffle (23), and the front baffle (22) and the rear baffle (23) are connected to the two ends of the roller (21) respectively. The outer edge friction block (3) includes a deflection frame (31), the two sides of the deflection frame (31) are connected with two outer friction members (32) respectively, the deflection frame (31) is transversely abutted on the circumferential outer edges of the front baffle (22) and the rear baffle (23), the two ends of the deflection frame (31) are movably connected to the two supporting plates (51), and the sling (4) passes through the strip-shaped hole in the middle of the deflection frame (31); when the deflection frame (31) is deflected by the sling (4), the deflection frame (31) is rubbed against the circumferential outer edges of the front baffle (22) and the rear baffle (23).

2. The reversible multifunction self-locking sling length adjuster according to claim 1, wherein: The end of the outer friction member (32) is designed as an inclined surface; when the deflection frame (31) is deflected, the ends of the two outer friction members (32) are respectively squeezed into the gaps between the front baffle (22) and the supporting plate (51) and between the rear baffle (23) and the other supporting plate (51) to generate friction.

3. The reversible multifunction self-locking type halter chest piece length adjuster according to claim 2, characterized in that: The end of the guide hole in the middle of the top guide frame (52) and the bottom guide frame (53) is provided with an opening; The middle of the strip-shaped hole in the deflection frame (31) is provided with an opening.

4. The reversible multifunction self-locking sling length adjuster according to claim 1, wherein: The front baffle (22) of the frame body (2) is provided with a sector-shaped notch, and a sector-shaped baffle (25) is detachably installed at the notch position. The end of the guide hole in the middle of the top guide frame (52) and the bottom guide frame (53) is provided with an opening; The middle of the strip-shaped hole in the deflection frame (31) is provided with an opening. The front baffle (22) of the frame body (2) is provided with a sector-shaped notch, and a sector-shaped baffle (25) is detachably installed at the notch position.

5. The reversible multifunction self-locking sling length adjuster according to claim 4, wherein: The frame body (2) further comprises a front rotating sleeve (26) and a rear rotating sleeve (27), the front rotating sleeve (26) is sleeved on one end of the roller (21) close to the front baffle (22), and the rear rotating sleeve (27) is sleeved on one end of the roller (21) close to the rear baffle (23); the pin shaft (1) passes through the middle of the front rotating sleeve (26) and the rear rotating sleeve (27). The edge of the front rotating sleeve (26) is provided with a fan-shaped notch, and the bottom of the fan-shaped baffle (25) is embedded in the notch of the edge of the front rotating sleeve (26).

6. The reverse direction multifunction self-locking type sling length adjuster according to claim 5, characterized in that: The fan-shaped baffle (25) is fixed by two rows of first screws (61), the first row of first screws (61) penetrates the fan-shaped baffle (25) and is threadedly connected to the fixed plate (24), and the second row of first screws (61) penetrates the fan-shaped baffle (25) and is threadedly connected to the roller (21). The periphery of the front rotating sleeve (26) is fixed to the roller (21) by three circumferentially distributed second screws (62); wherein the topmost second screw (62) penetrates the fan-shaped baffle (25) and is threadedly connected to the roller (21).

7. The reverse multi-functional self-locking type sling length adjuster according to claim 1, characterized by: Both ends of the top guide frame (52) and the bottom guide frame (53) are provided with connecting ears; the connecting ears at both ends of the top guide frame (52) are connected to the top of the two support plates (51) by third screws (63) respectively; the connecting ears at both ends of the bottom guide frame (53) are connected to the bottom of the two support plates (51) by third screws (63) respectively. The support plate (51) is further provided with a fourth screw (64), the fourth screw (64) penetrates the support plate (51) and is threadedly connected to the middle of the outer edge friction block (3).

8. The reversible multifunction self-locking type sling length adjuster according to any one of claims 1 to 7, characterized in that: The roller (21) is provided with three equidistantly distributed mounting cavities, and three central friction blocks (7) are respectively mounted in the three mounting cavities.

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