CN113323984B - Horizontal vibration-proof base used for being connected with instrument - Google Patents
Horizontal vibration-proof base used for being connected with instrument Download PDFInfo
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- CN113323984B CN113323984B CN202110547633.4A CN202110547633A CN113323984B CN 113323984 B CN113323984 B CN 113323984B CN 202110547633 A CN202110547633 A CN 202110547633A CN 113323984 B CN113323984 B CN 113323984B
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- concave surface
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/021—Decoupling of vibrations by means of point-of-contact supports, e.g. ball bearings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
- F16F15/08—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with rubber springs ; with springs made of rubber and metal
- F16F15/085—Use of both rubber and metal springs
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F7/00—Vibration-dampers; Shock-absorbers
- F16F7/003—One-shot shock absorbers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F2222/00—Special physical effects, e.g. nature of damping effects
- F16F2222/04—Friction
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F2236/00—Mode of stressing of basic spring or damper elements or devices incorporating such elements
- F16F2236/10—Shear
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F2238/00—Type of springs or dampers
- F16F2238/02—Springs
- F16F2238/022—Springs leaf-like, e.g. of thin, planar-like metal
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F2238/00—Type of springs or dampers
- F16F2238/02—Springs
- F16F2238/026—Springs wound- or coil-like
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Aviation & Aerospace Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Vibration Prevention Devices (AREA)
Abstract
The invention discloses a horizontal anti-vibration base for connecting with an instrument, wherein a plurality of lower conical concave surfaces are uniformly arranged on the edge of the top surface of a lower substrate; the upper substrate is correspondingly positioned above the lower substrate and is provided with an upper conical concave surface corresponding to the lower conical concave surface; the rolling pieces are respectively clamped between the lower conical concave surface and the upper conical concave surface which correspond to each group up and down, and roll and support the lower substrate and the upper substrate which are parallel up and down to generate relative motion; the upper ear plate is fixed on one side wall of the upper substrate and is provided with an upper through hole; the lower ear plate is fixed on one side wall of the lower substrate, corresponds to the upper ear plate and is provided with a lower through hole; the cutting pin penetrates through the upper through hole and the lower through hole, and the outer diameter of the cutting pin is matched with the inner diameter of the upper through hole and smaller than the inner diameter of the lower through hole. When the vibration occurs, the upper-layer substrate drives the bearing object to move horizontally relative to the lower-layer substrate, the earthquake shearing force in the horizontal direction is consumed in a rapid conversion mode, the shearing pins realize energy dissipation classification, and the using effect is good.
Description
Technical Field
The invention relates to the technical field of energy dissipation and shock absorption, in particular to a horizontal anti-vibration base for being connected with an instrument.
Background
The destructive force of the seismic waves on the building or the article comprises vertical pressure and horizontal shearing force, wherein the damage caused by the horizontal shearing force is huge. At present, two methods are generally adopted for protecting goods against earthquakes: the first is to strengthen the strength and rigidity of the article or the outer protective structure, so that the article or the outer protective structure can resist the impact of earthquake waves, but the cost is higher, and the anti-seismic titer is lower; the second method is to adopt a rubber pad or a damper shock insulation technology to absorb most of earthquake energy, but the absorption and conversion of the earthquake energy are incomplete and the shock absorption effect is not good. Moreover, many articles cannot be protected in a shock absorption manner by the two ways due to the defects of insufficient structure, insufficient rigidity and the like. Although a plurality of anti-seismic and shock-absorbing devices for protecting articles appear on the market at present, the using effect of the anti-seismic and shock-absorbing devices is not ideal, and the using requirements of users are difficult to meet.
Moreover, for many horizontal anti-seismic structures, the concept of graded anti-seismic is not clear, so that the vibration energy dissipation effect is not obvious for different grades of vibration, or no shock absorption occurs, or the shock absorption effect is too strong, so that unnecessary vibration is generated by the horizontal anti-seismic structure, and the horizontal anti-seismic structure has bad influence on connected instruments.
Therefore, an urgent need exists in the art to provide a horizontal anti-vibration base for connection with an apparatus, which can effectively dissipate energy by vibration and has a good grading effect.
Disclosure of Invention
In view of the above, the present invention provides a horizontal anti-vibration base for connecting with an instrument, which aims to solve the above technical problems.
In order to achieve the purpose, the invention adopts the following technical scheme:
a horizontal anti-vibration mount for connection with an instrument, comprising:
a lower substrate; a plurality of lower conical concave surfaces are uniformly formed on the edge of the top surface of the lower substrate;
an upper substrate; the upper substrate is correspondingly positioned above the lower substrate and is provided with an upper conical concave surface corresponding to the lower conical concave surface;
a rolling member; the rolling pieces are respectively clamped between the lower conical concave surface and the upper conical concave surface which correspond to each group up and down, and roll and support the lower substrate and the upper substrate which are parallel up and down to generate relative motion;
a stop member; the limiting component comprises an upper lug plate, a lower lug plate and a cutting pin; the upper ear plate is fixed on one side wall of the upper substrate and is provided with an upper through hole; the lower ear plate is fixed on one side wall of the lower substrate, corresponds to the upper ear plate and is provided with a lower through hole; the cutting pin penetrates through the upper through hole and the lower through hole, and the outer diameter of the cutting pin is matched with the inner diameter of the upper through hole and smaller than the inner diameter of the lower through hole.
According to the technical scheme, the lower substrate and the upper substrate are arranged in parallel up and down, the rolling pieces are used as rolling supports, the upper substrate and the lower substrate can move horizontally relative to each other, a bearing object needing vibration prevention is placed on the upper substrate, when vibration occurs, the upper substrate drives the bearing object to move horizontally relative to the lower substrate, the earthquake shearing force in the horizontal direction is quickly converted and consumed, and a good earthquake-proof effect is achieved; through setting up the shear pin, because there is the clearance between shear pin and the lower through-hole, when the shake for a short time, the shear pin can restrict the motion stroke of upper and lower base plate, when the shake for a long time, can cut short shear pin, the action of shock absorption by a wide margin carries out, and is hierarchical clear and definite, excellent in use effect.
Preferably, in the horizontal anti-vibration base for connecting with an instrument, a plurality of mounting holes are uniformly formed in the top surface of the upper substrate; a spring is fixed on the bottom surface of the mounting hole; and a cylindrical rubber seat is fixed at the top end of the spring, and the lower part of the cylindrical rubber seat is positioned in the mounting hole. The top surface of the upper substrate adopts the plurality of elastically connected cylindrical rubber seats, so that energy dissipation in the vertical direction of a bearing object can be realized, the cylindrical rubber seats with corresponding number can be pressed down according to the sizes of different bearing objects, and the surrounding cylindrical rubber seats can play a role in limiting and stabilizing.
Preferably, in the horizontal anti-vibration base for connection with an instrument as described above, the mounting holes are arranged in a 9 × 9 square matrix. The layout is compact and reasonable, and the use requirements can be met.
Preferably, in the horizontal vibration-proof base for connecting with the instrument, the rolling members are steel balls. The rolling piece directly selects the steel ball to realize the use effect simply and effectively.
Preferably, in the horizontal anti-vibration base for connecting with an instrument, a connecting column is fixed at the center of the top surface of the lower substrate; the outer side of the steel ball is rotatably connected with a limiting ring, and the top end and the bottom end of the steel ball protrude out of the limiting ring; the limiting ring is fixedly connected with the connecting column through a rope body. The steel ball can be prevented from falling off.
Preferably, in the horizontal anti-vibration base for connecting with the instrument, the number of the lower conical concave surfaces is 8. The layout is reasonable and uniform, and the stability is stronger.
Preferably, in the horizontal vibration-proof base for connecting with the instrument, in an initial state, the steel ball is positioned in the center of the concave surface of the lower cone. The structure is stable.
Preferably, in the horizontal vibration-proof base for connection to an instrument described above, the shear pin has a plurality of annular fracture lines formed thereon. Can be easily broken under the condition of large earthquake.
Preferably, in the horizontal anti-vibration base for connection with an instrument as described above, a counter bore is formed at the top of the upper through hole. The connection is stable, and the replacement is convenient.
Preferably, in the horizontal vibration-proof base for connection with an instrument described above, the lower substrate and the upper substrate are both square plates. The structural parts are convenient to arrange.
Through the technical scheme, compared with the prior art, the invention discloses the horizontal anti-vibration base for being connected with the instrument, and the horizontal anti-vibration base has the following beneficial effects:
1. according to the invention, the lower substrate and the upper substrate are arranged in parallel up and down, and the rolling piece is used as rolling support, so that the upper substrate and the lower substrate can generate relative horizontal movement, a bearing object needing vibration prevention is placed on the upper substrate, when vibration occurs, the upper substrate drives the bearing object to generate horizontal movement relative to the lower substrate, the seismic shearing force in the horizontal direction is quickly converted and consumed, and a good vibration prevention effect is achieved.
2. According to the invention, the shearing pin is arranged, and because a gap exists between the shearing pin and the lower through hole, the shearing pin can limit the movement stroke of the upper substrate and the lower substrate when the vibration is small, and can be used for shearing the shearing pin to perform large-amplitude shock absorption action when the vibration is large, so that the grading is clear, and the using effect is good.
3. The top surface of the upper substrate adopts the plurality of elastically connected cylindrical rubber seats, so that energy dissipation in the vertical direction can be realized for a bearing object, a corresponding number of cylindrical rubber seats can be pressed down according to the sizes of different bearing objects, and the peripheral cylindrical rubber seats can play a role in limiting and stabilizing.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural view of a horizontal anti-vibration base provided by the present invention;
fig. 2 is an exploded view of the horizontal vibration-proof base provided by the present invention;
fig. 3 is a cross-sectional view of a horizontal anti-vibration mount provided by the present invention;
FIG. 4 is a schematic structural diagram of a lower substrate according to the present invention;
FIG. 5 is a schematic top view of an upper substrate according to the present invention;
fig. 6 is a schematic structural view of the upper substrate from a bottom view according to the present invention.
Wherein:
1-lower substrate;
11-lower conical concavity; 12-a connecting column;
2-an upper substrate;
21-upper conical concave surface; 22-mounting holes; 23-a spring; 24-cylindrical rubber seat;
3-rolling elements;
31-a spacing ring; 32-a rope body;
4-a stop member;
41-upper ear plate; 411-upper via; 412-a counterbore; 42-lower ear plate; 421-lower via; 43-cutting the pin.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Referring to fig. 1 to 6, an embodiment of the present invention discloses a horizontal anti-vibration base for connecting with an instrument, including:
a lower substrate 1; a plurality of lower conical concave surfaces 11 are uniformly arranged on the edge of the top surface of the lower substrate 1;
an upper substrate 2; the upper substrate 2 is correspondingly positioned above the lower substrate 1 and is provided with an upper conical concave surface 21 corresponding to the lower conical concave surface 11;
the rolling members 3; the rolling pieces 3 are respectively clamped between the lower conical concave surface 11 and the upper conical concave surface 21 which correspond to each group up and down, and roll and support the lower substrate 1 and the upper substrate 2 which are parallel up and down to generate relative motion;
a stop member 4; the stop member 4 comprises an upper ear plate 41, a lower ear plate 42 and a cutting pin 43; the upper ear plate 41 is fixed on one side wall of the upper substrate 2 and is provided with an upper through hole 411; the lower ear plate 42 is fixed on one side wall of the lower substrate 1, corresponds to the upper ear plate 41, and is provided with a lower through hole 421; cutting pin 43 passes through upper through hole 411 and lower through hole 421, and the outer diameter of cutting pin 43 is adapted to the inner diameter of upper through hole 411 and is smaller than the inner diameter of lower through hole 421.
In order to further optimize the above technical solution, a plurality of mounting holes 22 are uniformly formed on the top surface of the upper substrate 2; a spring 23 is fixed on the bottom surface of the mounting hole 22; a cylindrical rubber seat 24 is fixed at the top end of the spring 23, and the lower part of the cylindrical rubber seat 24 is positioned in the mounting hole 22.
In order to further optimize the above technical solution, the mounting holes 22 are arranged in a 9 × 9 square matrix.
In order to further optimize the above technical solution, the rolling members 3 are steel balls.
In order to further optimize the technical scheme, a connecting column 12 is fixed at the center of the top surface of the lower substrate 1; the outer side of the steel ball is rotatably connected with a limiting ring 31, and the top end and the bottom end of the steel ball protrude out of the limiting ring 31; the limiting ring 31 is fixedly connected with the connecting column 12 through a rope body 32.
In order to further optimize the above technical solution, the number of the lower conical concave surfaces 11 is 8.
In order to further optimize the technical scheme, in an initial state, the steel ball is positioned in the center of the lower conical concave surface 11.
In order to further optimize the above solution, the shear pin 43 is formed with a plurality of ring-shaped fracture lines.
In order to further optimize the above technical solution, a counterbore 412 is formed at the top of the upper through hole 411.
In order to further optimize the above technical solution, the lower substrate 1 and the upper substrate 2 are both square plates.
In the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed in the embodiment corresponds to the method disclosed in the embodiment, so that the description is simple, and the relevant points can be referred to the description of the method part.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A horizontal anti-vibration mount for connection with an instrument, comprising:
a lower substrate (1); a plurality of lower conical concave surfaces (11) are uniformly arranged on the edge of the top surface of the lower substrate (1);
an upper substrate (2); the upper substrate (2) is correspondingly positioned above the lower substrate (1) and is provided with an upper conical concave surface (21) corresponding to the lower conical concave surface (11);
a rolling member (3); the rolling pieces (3) are respectively clamped between the lower conical concave surface (11) and the upper conical concave surface (21) which correspond to each group up and down, and roll and support the lower substrate (1) and the upper substrate (2) which are parallel up and down to move relatively; the rolling piece (3) is a steel ball; a connecting column (12) is fixed at the center of the top surface of the lower substrate (1); the outer side of the steel ball is rotatably connected with a limiting ring (31), and the top end and the bottom end of the steel ball protrude out of the limiting ring (31); the limiting ring (31) is fixedly connected with the connecting column (12) through a rope body (32);
a stop member (4); the limiting component (4) comprises an upper ear plate (41), a lower ear plate (42) and a cutting pin (43); the upper ear plate (41) is fixed on one side wall of the upper substrate (2) and is provided with an upper through hole (411); the lower ear plate (42) is fixed on one side wall of the lower substrate (1), corresponds to the upper ear plate (41) and is provided with a lower through hole (421); the cutting pin (43) penetrates through the upper through hole (411) and the lower through hole (421), and the outer diameter of the cutting pin (43) is matched with the inner diameter of the upper through hole (411) and is smaller than the inner diameter of the lower through hole (421).
2. The horizontal anti-vibration base for connecting with an instrument according to claim 1, characterized in that the top surface of the upper base plate (2) is uniformly provided with a plurality of mounting holes (22); a spring (23) is fixed on the bottom surface of the mounting hole (22); a cylindrical rubber seat (24) is fixed at the top end of the spring (23), and the lower part of the cylindrical rubber seat (24) is positioned in the mounting hole (22).
3. A horizontal anti-vibration mount for connection to an instrument according to claim 2, characterized in that the mounting holes (22) are arranged in a 9 x 9 square matrix.
4. Horizontal anti-vibration mount for connection to instruments according to claim 1, characterized in that the number of said lower conical concavities (11) is 8.
5. Horizontal anti-vibration base for connection to instruments according to claim 4, characterized in that the steel ball is located in the center of the lower conical concavity (11) in the initial state.
6. Horizontal anti-vibration mount for connection to instruments according to claim 1, characterized in that said cutting pin (43) is formed with a plurality of annular fracture lines.
7. A horizontal anti-vibration mount for connection to an instrument according to claim 1, characterized in that the top of the upper through hole (411) is formed with a counter bore (412).
8. Horizontal anti-vibration mount for connection to instruments according to claim 1, characterized in that said lower base plate (1) and said upper base plate (2) are both square plates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110547633.4A CN113323984B (en) | 2021-05-19 | 2021-05-19 | Horizontal vibration-proof base used for being connected with instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110547633.4A CN113323984B (en) | 2021-05-19 | 2021-05-19 | Horizontal vibration-proof base used for being connected with instrument |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113323984A CN113323984A (en) | 2021-08-31 |
| CN113323984B true CN113323984B (en) | 2022-12-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110547633.4A Active CN113323984B (en) | 2021-05-19 | 2021-05-19 | Horizontal vibration-proof base used for being connected with instrument |
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| CN (1) | CN113323984B (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2507332B2 (en) * | 1986-06-30 | 1996-06-12 | 安之助 石黒 | Lateral vibration damping mat device |
| JP3278806B2 (en) * | 1999-05-07 | 2002-04-30 | 小泉 恵三郎 | Seismic isolation device |
| WO2003093585A1 (en) * | 2002-04-28 | 2003-11-13 | Liping Jiang | An seismic isolator |
| KR100914032B1 (en) * | 2009-05-15 | 2009-08-28 | (주)중원기업 | Ball bearing type seismic isolator with conic groove |
| US8926180B2 (en) * | 2013-03-18 | 2015-01-06 | R. J. Watson, Inc. | Disc and spring isolation bearing |
| CN210423555U (en) * | 2019-05-28 | 2020-04-28 | 王守政 | Partition plate type anti-seismic pedestal |
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2021
- 2021-05-19 CN CN202110547633.4A patent/CN113323984B/en active Active
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| CN113323984A (en) | 2021-08-31 |
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Effective date of registration: 20230802 Address after: No. 18, Yizheng Smart Industrial Park, No. 6 Jinhua Road, Yizheng Economic Development Zone, Yangzhou City, Jiangsu Province, 225000 Patentee after: YANGZHOU LUOTUOKE CONTROL TECHNOLOGY Co.,Ltd. Address before: 458 Wenchang West Road, Yangzhou City, Jiangsu Province Patentee before: Yangzhou Vocational University (Yangzhou Radio and TV University) |
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