Elastic tightening sleeve extraction tool

Abstract

The application discloses a kind of elastic tensioning sleeve extraction frock, belong to mechanical frock equipment field, including: support component;Clamping assembly is connected to the end of the support component, the clamping assembly includes open state and folding state, when the clamping assembly is in folding state, the clamping assembly can be inserted into the inner hole of elastic tensioning sleeve;When the clamping assembly is inserted into the inner hole of elastic tensioning sleeve and switches from folding state to open state, the clamping assembly is clamped and fixed with elastic tensioning sleeve;Control assembly is located on the support component, for controlling clamping assembly from folding state to open state.The application has reduced the risk of scrapping height control valve caused by the problem of inner hole scratch due to using needle-nose pliers or L-shaped extraction true extraction, improves the extraction efficiency of elastic tensioning sleeve, and the frock can be suitable for disassembly and assembly operation of elastic tensioning sleeve.

Description

Technical Field

[0001] The invention belongs to the field of mechanical tooling equipment, and in particular relates to an elastic tension sleeve extraction tooling. Background Art

[0002] During the self-repair project of the height control valve, it is necessary to replace the inlet and outlet wire mesh of the height control valve. Before the replacement, it is necessary to remove the wire mesh fixing ring (elastic tension sleeve). Figure 1 The elastic tension sleeve currently in use includes a sleeve body 100 with an opening 101 disposed along the axial direction of the sleeve body 100. Two through-holes 102 are disposed coaxially on the sidewall of the sleeve body 101. The two through-holes 102 are equidistant from the opening 101.

[0003] The existing method involves using needle-nose pliers or an L-shaped extraction needle to extract the valve. However, due to the valve's inlet and outlet diameters being only 13mm and the elastic expansion sleeve being a thin, circular sleeve with a wall thickness of 1.25mm, the internal space is narrow. Using needle-nose pliers for extraction presents a lack of grip and makes extraction difficult. Using an L-shaped extraction needle, due to the thinness of the elastic expansion sleeve, can scratch the internal hole, damaging the valve and rendering it useless. Furthermore, the extraction process is unevenly applied, making it time-consuming and labor-intensive.

[0004] In view of this, the present invention is proposed. Summary of the Invention

[0005] To address at least some of the aforementioned issues, the present invention provides a tool for extracting an elastic expansion sleeve. This tool reduces the risk of scrapping a height control valve due to scratches on the inner bore caused by using needle-nose pliers or L-shaped extraction tools, thereby improving the efficiency of extracting the elastic expansion sleeve. Furthermore, the tool is suitable for both disassembly and assembly of the elastic expansion sleeve.

[0006] The basic concept of the technical solution adopted in the present invention is:

[0007] An elastic tension sleeve extraction tool, comprising:

[0008] Support components;

[0009] a clamping assembly connected to an end portion of the support member, wherein the clamping assembly has an open state and a closed state. When the clamping assembly is in the closed state, the clamping assembly can extend into the inner hole of the elastic tension sleeve; when the clamping assembly extends into the inner hole of the elastic tension sleeve and switches from the closed state to the open state, the clamping assembly is clamped and fixed to the elastic tension sleeve;

[0010] The control assembly is located on the support component and is used to control the clamping assembly to switch from a folded state to an open state.

[0011] Furthermore, the clamping assembly includes:

[0012] a fixed arm, fixed to the supporting member;

[0013] a movable arm, arranged side by side with the fixed arm and rotatably connected to the supporting member;

[0014] The control assembly can extend between the fixed arm and the movable arm and push the movable arm to rotate toward a side away from the fixed arm so that the fixed arm and the movable arm are relatively opened;

[0015] Preferably, the clamping assembly further includes a first reset elastic body, which is located between the movable arm and the supporting component. When the fixed arm and the movable arm are relatively opened, the first reset elastic body is compressed to store force.

[0016] Furthermore, a surface of a side of the fixed arm away from the movable arm is a semicircular surface, and / or a surface of a side of the movable arm away from the fixed arm is a semicircular surface.

[0017] Furthermore, pins are provided on surfaces of the fixed arm and the movable arm that are away from each other.

[0018] Furthermore, a slide is provided inside the supporting component, the control assembly is slidably connected to the slide, and one of the passage openings of the slide is located between the movable arm and the fixed arm.

[0019] Furthermore, the control component includes a push shaft slidably connected to the slide, the length of the push shaft is longer than the length of the slide, and the push shaft extends to the outside of the support component at one end away from the clamping component.

[0020] Furthermore, a force-applying handle is provided at one end of the pushing shaft extending to the outside of the supporting component, and the force-applying handle is perpendicular to the pushing shaft;

[0021] Preferably, the support component is provided with a holding handle parallel to the pushing handle.

[0022] Furthermore, the control component also includes a second reset elastic body, which is connected to the push shaft and the support component. When the push shaft extends between the fixed arm and the movable arm, the second reset elastic body is compressed to store force.

[0023] Furthermore, the supporting component includes a main body and a pressure cover, the control assembly is located between the main body and the pressure cover, the main body and the pressure cover are detachably connected, and the slide is located on a side surface of the main body facing the pressure cover.

[0024] Further, the main body part is provided with a mounting cavity on the side surface of the gland, the mounting cavity is located on the path of the slide, the mounting cavity is communicated with the slide, and the second reset elastic body is located in the mounting cavity.

[0025] Compared with the prior art, the technical scheme has the following beneficial effects.

[0026] The elastic expansion sleeve is extracted by the extraction tool, the elastic expansion sleeve is smoothly pulled out of the inner hole, the extraction difficulty of the elastic expansion sleeve of the metal wire screen of the air inlet and outlet of the high control valve of the self-maintenance part of the motor train unit is solved, and the elastic expansion sleeve in a narrow space is extracted.

[0027] The elastic expansion sleeve is extracted by the elastic expansion sleeve inner hole positioning, the elastic expansion sleeve wall thickness is increased to increase the pulling force, the elastic expansion sleeve is pulled out of the inner hole, the elastic expansion sleeve is quickly fixed and quickly released by the reset of the movable arm and the elastic reset part.

[0028] The hand-held torque is applied to ensure the reliability of the extraction, the expansion force is controllable, the operation is convenient, and the product appearance is protected.

[0029] The specific embodiments of the present application will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0030] The accompanying drawings are part of the present application and serve to provide a further understanding of the present application, the schematic embodiments of the present application and the description thereof serve to explain the present application, but do not constitute an improper limitation on the present application. Obviously, the accompanying drawings in the following description are only some embodiments, and other drawings can be obtained by those skilled in the art without creative labor. In the drawings:

[0031] Figure 1 is a structure diagram of the elastic expansion sleeve used on the height control valve;

[0032] Figure 2 is a structure diagram of the elastic expansion sleeve extraction tool of the present application when the clamping assembly is in the closed state;

[0033] Figure 3 is a structure diagram of the elastic expansion sleeve extraction tool of the present application when the clamping assembly is in the closed state;

[0034] Figure 4 is a structure diagram of the elastic expansion sleeve extraction tool of the present application when the clamping assembly is in the closed state;

[0035] Figure 5 is an exploded view of the elastic expansion sleeve extraction tool of the present application;

[0036] Figure 6 It is a schematic diagram of the connection structure between the main body of the support component and the control assembly of the present invention.

[0037] In the figure: 1. Support component; 11. Slide; 12. Main body; 13. Holding handle; 14. Concave platform; 15. Pressure cover; 151. Extension portion; 16. Mounting cavity; 2. Snap-fit ​​assembly; 21. Fixed arm; 22. Movable arm; 23. First return spring; 24. Pin; 3. Control assembly; 31. Push shaft; 311. Flange; 32. Force handle; 33. Second return spring; 100. Sleeve; 101. Opening; 102. Through hole.

[0038] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0040] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They 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 direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0041] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; and direct or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0042] like Figures 2 to 6 As shown, the present invention discloses an elastic tension sleeve extraction tool.

[0043] The elastic expansion sleeve extraction tool comprises a support component 1 and a clamping assembly 2 connected to the support component 1 and located at the end of the support component 1. The clamping assembly 2 has two states: a first state of opening and a second state of closing. When in the closed state, the clamping assembly 2 can extend into the inner hole of the elastic expansion sleeve. A control assembly 3 is mounted on the support component 1 to control the switching of the clamping assembly 2 from the closed state to the open state.

[0044] When connecting the clamping assembly 2 to the elastic expansion sleeve, the clamping assembly 2 is first placed in a retracted state. Once in the retracted state, the clamping assembly 2 is inserted into the inner hole of the elastic expansion sleeve. After the clamping assembly 2 is inserted into the inner hole of the elastic expansion sleeve, the control assembly 3 controls the clamping assembly 2 to switch from the retracted state to the open state. When the clamping assembly 2 is in the open state, the clamping assembly 2 and the elastic expansion sleeve are clamped and fixed. When the clamping assembly 2 needs to be removed from the inner hole of the elastic expansion sleeve, the control assembly 3 releases control of the clamping assembly 2, returning the clamping assembly 2 to the retracted state, and the clamping assembly 2 can be removed from the inner hole of the elastic expansion sleeve.

[0045] In this embodiment, the end of the support component 1 connected to the clamping assembly 2 is the leading end of the support component 1, and the end of the support component 1 away from the clamping assembly 2 is the trailing end of the support component 1. The control assembly 3 is slidably connected to the support component 1, and the movement direction of the control assembly 3 is set from the leading end of the support component 1 to the trailing end of the support component 1. When the control assembly 3 moves toward the leading end of the support component 1, the control assembly 3 controls the clamping assembly 2 to switch from the retracted state to the extended state. When the control assembly 3 moves toward the trailing end of the support component 1, the clamping assembly 2 gradually resets and returns to the retracted state.

[0046] Specifically, the clamping assembly 2 includes a fixed arm 21 fixed to the end surface of the front end of the support component 1 and a movable arm 22 rotatably connected to the front end of the support component 1 through a hinge, and the movable arm 22 and the fixed arm 21 are arranged side by side with a gap.

[0047] The hinge connecting the movable arm 22 to the support member 1 is located in the middle area between the two ends of the movable arm 22, forming a seesaw structure. One end of the movable arm 22 is located to the side of the support member 1, and the other end of the movable arm 22 is located in front of the head end of the support member 1. The end of the movable arm 22 located in front of the head end of the support member 1 is the front end of the movable arm 22, and the end of the movable arm 22 located to the side of the support member 1 is the rear end of the movable arm 22.

[0048] The clamping assembly 2 also includes a first return spring 23 located between the rear end of the movable arm 22 and the support component 1. One end of the first return spring 23 is relatively fixed to the rear end of the movable arm 22, and the other end of the first return spring 23 is relatively fixed to the support component 1.

[0049] When the movable arm 22 rotates to a position parallel to the fixed arm 21, the rear end of the movable arm 22 applies pressure to the first return spring 23, causing the first return spring 23 to be in a state of compression and stored force. When the first return spring 23 is in a non-compressed state, the first return spring 23 supports the rear end of the movable arm 22, causing the front end of the movable arm 22 to approach the fixed arm 21 and forming an angle between the movable arm 22 and the fixed arm 21.

[0050] In this embodiment, the side of the fixed arm 21 facing away from the movable arm 22 is a semicircular surface. The radius of the semicircular surface is compatible with the radius of the inner hole of the elastic expansion sleeve. When the fixed arm 21 is inserted into the inner hole of the elastic expansion sleeve, the surface of the fixed arm 21 facing away from the movable arm 22 fits against the wall of the inner hole of the elastic expansion sleeve, increasing the contact area between the fixed arm 21 and the elastic expansion sleeve. Alternatively, the surface of the movable arm 22 facing away from the fixed arm 21 is also a semicircular surface, the radius of the semicircular surface being compatible with the radius of the inner hole of the elastic expansion sleeve. After the movable arm 22 is inserted into the inner hole of the elastic expansion sleeve and is clipped and fixed to the elastic expansion sleeve, the surface of the movable arm 22 facing away from the fixed arm 21 fits against the wall of the inner hole of the elastic expansion sleeve, increasing the contact area between the movable arm 22 and the elastic expansion sleeve.

[0051] More preferably, the side surface of the fixed arm 21 facing away from the movable arm 22 and the side surface of the movable arm 22 facing away from the fixed arm 21 are both semicircular surfaces.

[0052] Specifically, a pin 24 is provided on the surface of the movable arm 22 and the fixed arm 21 on the side facing away from each other. The pin 24 on the movable arm 22 is integrally formed with the movable arm 22 or welded to the movable arm 22. The pin 24 on the fixed arm 21 is integrally formed with the fixed arm 21 or welded to the fixed arm 21. The pins 24 are all cylindrical in structure. When the movable arm 22 and the fixed arm 21 are in a relatively open state, the pin on the fixed arm 21 is coaxially arranged with the pin 24 on the movable arm 22. The diameter of the pin 24 is smaller than the aperture of the through hole 102, so that the pin 24 can extend into the through hole 102 of the elastic tension sleeve.

[0053] Specifically, a slideway 11 is provided within the support member 1, extending from the rear end toward the front end. The opening where the slideway 11 communicates with the front end of the support member 1 is located between the movable arm 22 and the fixed arm 21. The control assembly 3 is slidably connected within the slideway 11. One end of the control assembly 3 located at the rear end of the support member 1 extends to the outside of the rear end of the support member 1, leaving a clearance between the control assembly 3 and the rear end. This clearance allows the control assembly 3 to move toward the front end of the support member 1 and drive the movable arm 22 to rotate.

[0054] When force is applied to the control assembly 3 and the control assembly 3 moves toward the front end of the support member 1, the control assembly 3 extends from the passage opening of the slide 11 located on the end surface of the front end of the support member 1. The control assembly 3 extending from the passage opening pushes the movable arm 22, causing the front end of the movable arm 22 to rotate away from the fixed arm 21, causing the fixed arm 21 and the movable arm 22 to open relative to each other. When the fixed arm 21 and the movable arm 22 are opened relative to each other, this state is the open state of the clamping assembly 2.

[0055] When the control component 3 releases the force applied to the movable arm 22 and moves toward the tail end of the support part 1, the control component 3 gradually retracts into the interior of the support part 1. At this time, the first return spring 23 pushes the rear end of the movable arm 22, so that the front end of the movable arm 22 approaches the direction of the fixed arm 21 until the first return spring 23 no longer applies force to the rear end of the movable arm 22. At this time, the movable arm 22 and the fixed arm 21 are relatively retracted. This state is the retracted state of the clamping component 2.

[0056] The control assembly 3 includes a push shaft 31 that is slidably connected to the interior of the slideway 11. The push shaft 31 is longer than the slideway 11. A force-applying handle 32 is provided at one end of the push shaft 31, located at the rear end of the support member 1. The force-applying handle 32 is perpendicular to the push shaft 31. The force-applying handle 32 is connected to the push shaft 31 at its mid-length. The force-applying handle 32 and the push shaft 31 are integrally formed.

[0057] A second return spring 33 is interposed between the push shaft 31 and the support member 1. One end of the second return spring 33 is fixed relative to the push shaft 31, while the other end is fixed relative to the support member 1. When force is applied to the push shaft 31, causing it to move toward the leading end of the support member 1, the second return spring 33 is compressed and stored. When the force applied to the push shaft 31 is released, the second return spring 33 is released, driving the push shaft 31 toward the trailing end of the support member 1.

[0058] Specifically, the support component 1 includes a main body 12 in a rectangular shape. It should be noted that the shape of the main body 12 is not limited to a rectangle, and may also be a cylinder or other shapes.

[0059] The clamping assembly 2 is connected to the main body 12 and is located at one end of the main body 12 in the length direction. The end of the main body 12 connected to the clamping assembly 2 is the head end of the main body 12, and the end of the main body 12 away from the clamping assembly 2 is the tail end of the main body 12.

[0060] A gripping handle 13 is provided at the tail end of the main body 12, and the gripping handle 13 is perpendicular to the main body 12. The middle position of the gripping handle 13 in the longitudinal direction is connected to the main body 12. The gripping handle 13 and the main body 12 are integrally formed.

[0061] A recessed platform 14 is provided on the side wall of one side of the main body 12 and the grip 13. A pressure cover 15 is provided on the recessed platform 14. The pressure cover 15 is pressed on the recessed platform 14 and fixed to the main body 12 by bolts. When the pressure cover 15 is pressed on the recessed platform 14, the surface of the pressure cover 15 is flush with the surface of the main body 12.

[0062] The recessed platform 14 extends onto the gripping handle 13. The pressure cover 15 is provided with an extension portion 151 extending onto the gripping handle 13. The extension portion 151 is integrally formed with the pressure cover 15. The shape of the extension portion 151 matches the shape of the area where the recessed platform 14 extends onto the gripping handle 13. When the extension portion 151 presses against the area where the recessed platform 14 extends onto the gripping handle 13, the surface of the extension portion 151 is flush with the surface of the gripping handle 13.

[0063] Specifically, the slide 11 is located on the recessed platform 14. The recessed platform 14 also has a mounting cavity 16 disposed along the extension path of the slide 11. The mounting cavity 16 is wider than the width of the slide 11, and the centerline of the mounting cavity 16 in the width direction coincides with the centerline of the width direction of the slide 11. A step forms the connection between the mounting cavity 16 and the slide 11.

[0064] The second return spring 33 of the control assembly 3 is located in the installation cavity 16 , and the second return spring 33 is sleeved on the outside of the pushing shaft 31 .

[0065] Specifically, a flange 311 extending outward is provided on the push shaft 31, and the flange 311 is integrally formed with the push shaft 31. The second return spring 33 is located between the flange 311 and the step formed between the mounting cavity 16 and the slide 11. The second return spring 33 is located on the side of the flange 311 facing the clamping assembly 2. When force is applied to the push shaft 31 and the push shaft 31 is moved in the direction of the clamping assembly 2, the flange 311 transfers force to the second return spring 33, and the second return spring 33 is compressed and stores force. When the force applied to the push shaft 31 is released, the second return spring 33 pushes the flange 311, driving the push shaft 31 to move away from the clamping assembly 2 until the push shaft 31 is completely retracted into the slide 11.

[0066] The second return spring 33 and the flange 311 are fixedly connected or in contact with each other, as well as the second return spring 33 and the step formed between the installation cavity 16 and the slideway 11 .

[0067] When removing the elastic sleeve, first place the clamping assembly 2 in the folded state, then insert the folded clamping assembly 2 into the inner hole of the elastic sleeve. After the clamping assembly 2 is inserted into the inner hole of the elastic sleeve, align the pin 24 on the fixed arm 21 with one of the through holes 102 on the elastic sleeve, and insert the pin 24 into the opposite through hole 102.

[0068] By applying force to the control component 3, the control component 3 moves toward the head end of the support component 1. When the control component 3 moves toward the head end of the support component 1, the push shaft 31 of the control component 3 pushes the movable arm 22, causing the front end of the movable arm 22 to rotate toward the side away from the fixed arm 21, and the pin shaft 24 on the movable arm 22 is inserted into another through hole 102.

[0069] Once the pin 24 of the movable arm 22 is inserted into the through-hole 102, force can be applied to the extraction tool as a whole to extract the elastic tension sleeve. Once the elastic tension sleeve is extracted, the force applied to the control assembly 3 is released, and the second return spring 33 releases its stored force, pushing the push shaft 31 toward the rear end of the support component 1. As the push shaft 31 moves toward the rear end of the support component 1, the first return spring 23 pushes the movable arm 22 to rotate, causing the front end of the movable arm 22 to rotate toward the fixed arm 21, placing the clamping assembly 2 in the retracted state. Once the clamping assembly 2 is in the retracted state, remove it from the inner hole of the elastic tension sleeve to separate the extraction tool from the elastic tension sleeve.

[0070] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with this patent can make slight changes or modifications to equivalent embodiments of equivalent changes using the above-mentioned technical contents without departing from the scope of the technical solution of the present invention. The implementation schemes in the above-mentioned embodiments can also be further combined or replaced. However, any simple modifications, equivalent changes and modifications made to the above-mentioned embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the solution of the present invention.

Claims

1. An elastic tension sleeve extraction tool, characterized in that: Includes: Support member (1); A clamping assembly (2) is connected to the end of the supporting component (1), and the clamping assembly (2) includes an open state and a closed state. When the clamping assembly (2) is in the closed state, the clamping assembly (2) can extend into the inner hole of the elastic tensioning sleeve; when the clamping assembly (2) extends into the inner hole of the elastic tensioning sleeve and switches from the closed state to the open state, the clamping assembly (2) is clamped and fixed to the elastic tensioning sleeve; A control component (3), located on the support component (1), is used to control the clamping component (2) to switch from a retracted state to an extended state; The clamping assembly (2) comprises: A fixed arm (21) fixed on the supporting component (1); A movable arm (22) is arranged side by side with the fixed arm (21) and is rotatably connected to the support component (1); The control assembly (3) is capable of extending between the fixed arm (21) and the movable arm (22) and pushing the movable arm (22) to rotate toward a side away from the fixed arm (21) so that the fixed arm (21) and the movable arm (22) are relatively opened; The surfaces of the fixed arm (21) and the movable arm (22) facing away from each other are both provided with pin shafts (24); A slideway (11) is provided inside the support component (1), the control assembly (3) is slidably connected to the slideway (11), and one of the passage openings of the slideway (11) is located between the movable arm (22) and the fixed arm (21); The control assembly (3) includes a push shaft (31) slidably connected in the slideway (11), the length of the push shaft (31) is longer than the length of the slideway (11), and the end of the push shaft (31) away from the clamping assembly (2) extends to the outside of the support component (1); A force-applying handle (32) is provided at one end of the pushing shaft (31) extending to the outside of the supporting component (1), and the force-applying handle (32) is perpendicular to the pushing shaft (31); The support component (1) is provided with a holding handle (13) parallel to the pushing handle.

2. The elastic tension sleeve extraction tool according to claim 1, characterized in that: The clamping assembly (2) further comprises a first resetting elastic body, which is located between the movable arm (22) and the supporting component (1). When the fixed arm (21) and the movable arm (22) are relatively opened, the first resetting elastic body is compressed to store force.

3. The elastic tension sleeve extraction tool according to claim 2, characterized in that: The surface of one side of the fixed arm (21) facing away from the movable arm (22) is a semicircular surface, and / or the surface of one side of the movable arm (22) facing away from the fixed arm (21) is a semicircular surface.

4. The elastic tension sleeve extraction tool according to claim 1, characterized in that: The control assembly (3) further comprises a second resetting elastic body, which is connected to the pushing shaft (31) and the supporting component (1). When the pushing shaft (31) extends between the fixed arm (21) and the movable arm (22), the second resetting elastic body is compressed to store force.

5. The elastic tension sleeve extraction tool according to claim 4, characterized in that: The support component (1) includes a main body (12) and a pressure cover (15), the control assembly (3) is located between the main body (12) and the pressure cover (15), the main body (12) and the pressure cover (15) are detachably connected, and the slideway (11) is located on a side surface of the main body (12) facing the pressure cover (15).

6. The elastic tension sleeve extraction tool according to claim 5, characterized in that: A mounting cavity (16) is further provided on a surface of one side of the main body (12) facing the pressure cover (15). The mounting cavity (16) is located on the path of the slideway (11). The mounting cavity (16) is connected to the slideway (11), and the second reset elastic body is located in the mounting cavity (16).

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