Telescopic carrying platform of combined nucleic acid pretreatment equipment

Abstract

The invention provides a telescopic carrying table of combined nucleic acid pretreatment equipment. The telescopic carrying table comprises a working table, a carrying table body, two supporting pieces, two sliding rails and two sliding blocks. The working table is provided with a hollow part, the carrying table is provided with two side edges, and the carrying table covers the hollow part of the working table. The supporting pieces are oppositely arranged and are respectively fixed and adjacent to the bottoms of the two side edges of the carrying table. The sliding rails are oppositely arranged and fixed to the supporting pieces respectively, the sliding blocks are oppositely arranged and each provided with a groove, the grooves of the sliding blocks are matched with the sliding rails respectively, and the sliding rails are located in the grooves of the sliding blocks respectively. According to the telescopic carrying table of the combined nucleic acid pretreatment equipment, a user can conveniently pull out the carrying table to feed and discharge test tubes, the occupied space of the sliding rail and the sliding block in the vertical direction in the equipment can be reduced, and the structural rigidity of the carrying table is enhanced.

Description

Technical Field

[0001] This invention relates to a platform for a combined nucleic acid pretreatment device, and more particularly to a telescopic platform for a combined nucleic acid pretreatment device that is convenient for users to load and unload sample tubes and has a stable structure. Background Technology

[0002] In existing nucleic acid pretreatment equipment, the extraction tray's transport area spans the sample transfer chamber and is located on the side of the equipment closest to the user. However, the sample collection tube loading / unloading platform is located inside the equipment and away from the user, causing inconvenience for users when loading and unloading sample collection tubes and increasing the risk of tube tipping and contamination. To solve this problem, a sliding rail can be installed on the sample collection tube loading / unloading platform, allowing the user to pull it out for easy loading and unloading.

[0003] Existing slide rail designs include general drawer-type slide rails and industrial linear slide rails. General drawer-type slide rails do not require tracks on the operating path; however, they have weak load-bearing capacity and are prone to large displacements under load, resulting in poor position repeatability and instability in automated processes. Industrial linear slide rails require tracks on the operating path, which overlap with the tray conveying area of ​​the extraction orifice plate, causing collisions between the sampling tube loading / unloading platform and the extraction orifice plate.

[0004] Therefore, developing a telescopic platform for a combined nucleic acid pretreatment device that does not require the configuration of tracks on the path, facilitates the loading and unloading of sample tubes by users, enhances the structural rigidity and positioning accuracy of the platform when pulled out to the loading and unloading area, and provides stability for the automated process, is an urgent problem to be solved in this field. Summary of the Invention

[0005] To address the problems of the prior art, the present invention aims to provide a telescopic platform for a combined nucleic acid pretreatment device. By setting a linear slide rail at the bottom of the platform, the present invention facilitates the user to pull out the platform and load / unload test tubes, reduces the vertical space occupied by the slide rail and slider inside the combined nucleic acid pretreatment device, and enhances the rigidity of the telescopic structure of the platform.

[0006] To achieve the above objectives, the present invention provides a telescopic platform for a combined nucleic acid pretreatment device, comprising:

[0007] A workbench includes a hollow section, two opposing side top surfaces and two opposing inner surfaces, the two pairs of opposing inner surfaces surrounding to form the hollow section, and the hollow section being located between the two opposing side top surfaces.

[0008] A platform includes two opposing sides, each side of which is parallel to the two opposing inner sides of the worktable, and the platform covers the hollowed-out part of the worktable.

[0009] Two support members are arranged opposite each other and fixed to the bottom of the two sides of the platform respectively. Each support member is parallel to the two opposite inner sides of the platform.

[0010] Two slide rails, each positioned opposite to and fixed to two supporting members; and

[0011] Two sliders are positioned opposite each other and each has a groove. The groove of each slider mates with a corresponding slide rail, and each slide rail is located within the groove of each slider. The slide rails and sliders together form a linear slide rail.

[0012] In one embodiment, the grooves of each slider face away from each other.

[0013] In one specific embodiment, the platform further includes two support frames, each support frame being disposed between two opposite sides of the platform, and each support frame being parallel to the two opposite sides of the platform, extending from one end of the platform to the opposite end.

[0014] In one embodiment, the platform further includes a pull plate. The pull plate has a handle disposed on its surface. The pull plate is fixed to the surface of the platform and covers a portion of the platform and a portion of the two support frames.

[0015] In one specific embodiment, the sampling tube loading and unloading platform further includes at least one first positioning pin and at least one second positioning pin. The first positioning pin and the second positioning pin are disposed on the support frame or the platform. The first positioning pin and the second positioning pin are disposed opposite to each other or diagonally. The size of the first positioning pin is different from the size of the second positioning pin.

[0016] In one specific embodiment, the number of first positioning pins is one, and the number of second positioning pins is one.

[0017] In one specific embodiment, the stage further includes a positioning detection element disposed on one side of the stage.

[0018] In one specific embodiment, the positioning detection element is a metal sheet.

[0019] In one specific embodiment, the telescopic platform of the combined nucleic acid pretreatment device further includes two parallelism adjustment components. Each parallelism adjustment component is arranged opposite to each other and includes a base plate, a side plate, at least two first threads, and at least two second threads. The base plate and the side plate are connected in an L-shape. The base plate of each parallelism adjustment component is fixed to the worktable and is adjacent to the inner side of the worktable and located below the platform. At least two first threads are provided on the base plate of each parallelism adjustment component, and at least two second threads are provided on the side plate of each parallelism adjustment component.

[0020] In one specific embodiment, the telescopic platform of the combined nucleic acid pretreatment device further includes two positioning components, each positioned opposite to the other and each including a fixing seat and a positioning bead. The fixing seat is disposed on the outer side of the support member of the sample collection tube loading and unloading platform, and the fixing seat has a recess. The positioning bead is disposed on the side top surface of the platform, and the positioning bead includes a round bead, the round bead of which is located in the recess of the fixing seat.

[0021] In one specific embodiment, the telescopic platform of the combined nucleic acid pretreatment device further includes two blocking components. Each blocking component is arranged opposite to the other and includes a first abutment and a first stop. The first abutment is disposed on the outer side of the support member of the sample collection tube loading and unloading platform and is adjacent to the fixed base. The first stop is disposed on the top side of the worktable and is adjacent to the positioning bead. The first abutment abuts against the first stop.

[0022] In one specific embodiment, the telescopic platform of the combined nucleic acid pretreatment device further includes two height limiting components, each of which is arranged opposite to each other and includes a second stop and a second abutment. The second stop is disposed on the outer side of the support member of the sample collection tube loading and unloading platform, and is adjacent to the side of the first abutment adjacent to the fixed seat. The second abutment is disposed on the top side of the worktable, and is adjacent to the side of the first stop adjacent to the positioning bead. The second abutment includes a roller, the top of which abuts against the bottom of the second stop.

[0023] In one specific embodiment, the telescopic platform of the combined nucleic acid pretreatment device further includes a photoelectric sensor, which is disposed on the top side of the platform and adjacent to the other side of the second abutment member and the first stop member.

[0024] The telescopic platform of the combined nucleic acid pretreatment device of the present invention has the following advantages: (1) By sliding the linear slide rail, the user can pull the platform 50 cm from the working area toward the user to the loading and unloading area, so as to facilitate the user's loading and unloading, and can enhance the structural rigidity and positioning accuracy of the platform when pulled out to the loading and unloading area, providing the stability required for the automated process; (2) By fixing the slider to the working table and fixing the slide rail to the platform, the platform can be moved by the slide rail, and a long stroke (50 cm) movement can be achieved, and no track needs to be configured on the path; (3) By setting the linear slide rail below the platform, the platform and the linear slide rail located on both sides below the platform form an M-shaped structure, which can reduce the vertical space occupied by the linear slide rail inside the combined nucleic acid pretreatment device, and increase the stability of the platform. The structural rigidity of the stage pulled out to the loading and unloading area (i.e., it can withstand a large torque in the direction of movement) can prevent the structure from being damaged or deformed by external forces when the stage is pulled out to the loading and unloading area for loading and unloading in an overhang state; (4) the parallelism adjustment resolution of the stage can be improved by the first and second threads of the parallelism adjustment component; (5) the positioning component can provide the user with a feel when pushing the stage to the working area, so as to reduce the user's uncertainty when pulling the stage; (6) the blocking component can prevent the stage from moving excessively toward the interior of the combined nucleic acid pretreatment device; (7) the height limiting component can maintain the height of the stage in the working area; and (8) the photoelectric sensor and positioning detection component can confirm that the stage is in the working area. Attached Figure Description

[0025] Figure 1 This is a top view of the telescopic platform of the combined nucleic acid pretreatment device of the present invention.

[0026] Figure 2 This is a perspective view of the telescopic platform of the combined nucleic acid pretreatment device of the present invention in the working area.

[0027] Figure 3 This is a perspective view of the telescopic platform of the combined nucleic acid pretreatment device of the present invention in the loading and unloading area.

[0028] Figure 4 Showing a front view of the telescopic platform of the combined nucleic acid pretreatment device of the present invention.

[0029] Figure 5 This shows a cross-sectional view of the telescopic platform of the combined nucleic acid pretreatment device of the present invention.

[0030] Figure 6 This is a perspective view of the parallelism adjustment component of the telescopic platform of the combined nucleic acid pretreatment device of the present invention combined with the loading and unloading platform of the sampling tube.

[0031] Figure 7This is a perspective view of the telescopic platform of the combined nucleic acid pretreatment device of the present invention.

[0032] Figure 8 This is a perspective view of the positioning component, blocking component, height limiting component, and photoelectric sensor of the telescopic platform of the combined nucleic acid pretreatment device of the present invention, combined with the loading and unloading platform for the sampling tube.

[0033] Figure 9 This is a perspective view of the fixed base, first abutment, second stop, and positioning detection component of the telescopic platform of the combined nucleic acid pretreatment device of the present invention, combined with the support component of the sampling tube loading and unloading platform.

[0034] Figure 10 This is a perspective view of the positioning bead, first stop, second abutment, and photoelectric sensor of the telescopic platform of the combined nucleic acid pretreatment device of the present invention, combined with the worktable of the sampling tube loading and unloading platform.

[0035] Explanation of reference numerals in the attached figures

[0036] 1: Modular nucleic acid pretreatment equipment; 112: Inner side;

[0037] 10: Inspection and sampling tube loading / unloading platform; 12: Platform;

[0038] 11: Workbench, 121: Pull-out plate,

[0039] 111: Side top surface; 122: Support frame;

[0040] 13: Support components

[0041] 14: Slide rail,

[0042] 15: Slider

[0043] 16: First locating pin,

[0044] 17: Second locating pin,

[0045] 18: Positioning detection components

[0046] 20: Parallelism adjustment component

[0047] 21A: First thread,

[0048] 21B: Second thread,

[0049] 30: Positioning components

[0050] 31: Fixed base,

[0051] 311: dent,

[0052] 32: Positioning bead

[0053] 40: Blocking components

[0054] 41: First supporting document

[0055] 42: First stop component

[0056] 50: Height limiting component,

[0057] 51: Second stop component

[0058] 52: Second supporting document,

[0059] 60: Photoelectric sensor

[0060] A1: Work area

[0061] A2: Loading and unloading area. Detailed Implementation

[0062] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can understand other advantages and effects of the present invention through the content disclosed in this specification. However, the exemplary embodiments disclosed in this invention are for illustrative purposes only and should not be considered as limiting the scope of the invention. In other words, the present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified and changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0063] Unless otherwise stated herein, the singular forms “a” and “the” used in the specification and the appended claims include the numerals.

[0064] Unless otherwise stated herein, the term “or” as used in the specification and the appended claims includes the meaning of “and / or”.

[0065] The term "working area" as used in this invention refers to the area where automated processes such as the transfer of sample collection tubes or the opening and closing of sample collection tube caps are performed. In an embodiment of this invention, the furthest distance of the working area A1 from the inlet and outlet of the combined nucleic acid pretreatment equipment (i.e., the side closer to where the user loads and unloads sample collection tubes) is, for example, 80 cm.

[0066] The term "loading and unloading area" used in this invention refers to the area where the sample collection tubes are loaded and unloaded. The furthest distance between the loading and unloading area and the inlet and outlet of the combined nucleic acid pretreatment equipment is, for example, 30 centimeters.

[0067] See Figure 1 , Figure 4 , Figure 6 and Figure 8The combined nucleic acid pretreatment equipment 1 includes a sample tube loading and unloading platform 10, two parallelism adjustment components 20, two positioning components 30, two blocking components 40, two height limiting components 50, and a photoelectric sensor 60.

[0068] See Figures 1 to 7 The sample collection tube loading / unloading platform 10 is located in the working area A1 of the combined nucleic acid pretreatment equipment 1. The sample collection tube loading / unloading platform 10 includes a workbench 11, a platform 12, two support members 13, two slide rails 14, two sliders 15, three first positioning pins 16, three second positioning pins 17, and a positioning detection member 18. The workbench 11 has a hollow section, two opposing side top surfaces 111, and two opposing inner surfaces 112. The two sets of two opposing inner surfaces 112 together form the hollow section, and the hollow section is located between the two opposing side top surfaces 111. The platform 12 has two opposing sides, a pull plate 121, and two support frames 122. Each side of the platform 12 is parallel to the two opposing inner surfaces 112 of the workbench 11, and the platform 12 covers the hollow section of the workbench 11. The pull plate 121 has a handle 1211, which is disposed on the surface of the pull plate 121. The pull plate 121 is fixed to the surface of the platform 12 and covers a portion of the platform 12, such that the bottom of a portion of the pull plate 121 overlaps with the surface of a portion of the platform 12. Each support frame 122 is disposed below the pull plate 121, and each support frame 122 is disposed between two opposite sides of the platform 12, and each support frame 122 is parallel to the two opposite sides of the platform 12, extending from one end of the platform 12 adjacent to the pull plate 121 to the opposite end.

[0069] Two support members 13 are arranged opposite to each other and fixed to the bottom of two sides adjacent to the platform 12. The two support members 13 are parallel to the two opposite inner sides 112 of the worktable 11. Two slide rails 14 are arranged opposite to each other and fixed to the two support members 13. Each slider 15 is arranged opposite to each other and has a groove. The grooves of each slider 15 face away from each other. The grooves of each slider 15 mate with each slide rail 14, and the two slide rails 14 are located in the grooves of each slider 15. The slide rails 14 and sliders 15 form a linear slide rail. The user P1 can use the handle 1211 on the pull plate 121 to slide the linear slide rail and pull the platform 12 50 cm from the working area A1 toward the loading and unloading area A2 to facilitate loading and unloading by the user P1. Furthermore, by fixing the slider 15 to the worktable 11 and the slide rail 14 to the platform 12, and by moving the platform 12 via the slide rail 14, the structural rigidity and positioning accuracy of the platform 12 when pulled out to the loading / unloading area A2 can be enhanced. Moreover, see... Figure 5By placing the linear slide rails below the stage 12, the stage 12 and the linear slide rails located on both sides below the stage 12 form an M-shaped structure, which can reduce the vertical space occupied by the linear slide rails inside the combined nucleic acid pretreatment equipment 1 and enhance the structural rigidity of the stage 12 when it is pulled out to the loading and unloading area A2.

[0070] Each first positioning pin 16 is tapered and is respectively disposed on the support frame 122 and the platform 12 adjacent to the pull plate 121. Each second positioning pin 17 is tapered and is respectively disposed on the support frame 122 and the platform 12 away from the pull plate 121. The size of each second positioning pin 17 is larger than the size of each first positioning pin 16, and the second positioning pins 17 are arranged opposite to and diagonally to the first positioning pins 16. The arrangement of the first positioning pins 16 and the second positioning pins 17 can assist in the positioning of the sampling tube rack on the platform 12, avoiding the situation where the sampling tube rack is placed in the wrong direction on the platform 12.

[0071] See Figure 4 and Figure 5 The positioning detection element 18 is L-shaped and is respectively disposed on the right side of the stage 12. The positioning detection element 18 can confirm that the stage 12 has indeed returned to the working area A1, preventing the combined nucleic acid pretreatment device 1 from proceeding with subsequent processes and causing danger before the stage 12 has returned to the working area A1. In this embodiment, the positioning detection element 18 is a metal part.

[0072] See Figure 5 and Figure 6 Each parallelism adjustment component 20 includes a base plate, a side plate, two first threads 21A, and two second threads 21B. The base plate and the side plate are connected in an L-shape. The two first threads 21A are disposed on the base plate of each pair of parallelism adjustment components, and the two second threads 21B are disposed on the side plate of each pair of parallelism adjustment components. The two parallelism adjustment components 20 are respectively arranged opposite to each other, and the base plate of each parallelism adjustment component 20 is fixed to the worktable 11 and adjacent to the inner side 112 of the worktable 11 and located below the platform 12. Each slider 15 is respectively fixed to the inner side of the side plate of each parallelism adjustment component 20. The parallelism of the plane of the platform 12 can be adjusted by rotating the two second threads 21B to the left (loosening) from the side plate of each parallelism adjustment component 20 and rotating the two first threads 21A upward as needed. The first threads 21A and the second threads 21B both use fine threads to improve the resolution of the parallelism adjustment of the platform 12.

[0073] See Figure 1 and Figures 8 to 10Two positioning components 30 are arranged opposite to each other, and each positioning component 30 includes a fixed seat 31 and a positioning bead 32. The fixed seat 31 is located on the outer side of the support member 13 of the sampling tube loading and unloading platform 10, and is adjacent to the pull plate 121 of the platform 12; the fixed seat 31 has a recess 311. The positioning bead 32 is located on the side top surface 111 of the worktable 11, and the positioning bead 32 has a round ball. When the user P1 pushes the platform 12 to the working area A1, the positioning bead 32 engages with the fixed seat 31, and the round ball inside the positioning bead 32 enters the recess 311 of the fixed seat 31. The positioning components 30 provide the user P1 with a tactile feel when pushing the platform 12 to the working area A1, thereby reducing the user P1's uncertainty when pulling the platform 12.

[0074] Two blocking components 40 are arranged opposite to each other, and each blocking component 40 includes a first abutment 41 and a first stop 42. The first abutment 41 is disposed on the outer side of the support member 13 of the sample collection tube loading and unloading platform 10 and is adjacent to the fixed base 31; the first stop 42 is disposed on the side top surface 111 of the worktable 11 and is adjacent to the positioning bead 32. When the user P1 pushes the platform 12 to the working area A1, the first abutment 41 will abut against the first stop 42 to prevent the platform 12 from moving excessively toward the interior of the combined nucleic acid pretreatment device 1.

[0075] Two height limiting components 50 are arranged opposite to each other, and each height limiting component 50 includes a second stop 51 and a second abutment 52. The second stop 51 is disposed on the outer side of the support member 13 of the sampling tube loading and unloading platform 10, and is adjacent to the other side of the first abutment 41 and the fixed seat 31. The second abutment 52 is disposed on the side top surface 111 of the worktable 11, and is adjacent to the other side of the first stop 42 and the positioning bead 32; the second abutment 52 has a roller. When the user P1 pushes the platform 12 to the working area A1, the top of the roller of the second abutment 52 will abut against the bottom of the second stop 51 to maintain the height of the platform 12 in the working area A1.

[0076] A photoelectric sensor 60 is disposed on the side top surface 111 of the worktable 11. The photoelectric sensor 60 is adjacent to the other side of the second abutment 52 and the first stop 42. When the user P1 pushes the platform 12 to the working area A1, the photoelectric sensor 60 corresponds to the positioning detection element 18, and the photoelectric sensor 60 projects light in the direction of the positioning detection element 18. If the light is blocked by the positioning detection element 18, it can be confirmed that the platform 12 is located in the working area A1.

[0077] See Figure 3 and Figure 8In this embodiment, from the loading / unloading area A2 toward the working area A1, two positioning components 30, two blocking components 40, two height limiting components 50 and a photoelectric sensor 60 are sequentially arranged on both sides of the sampling tube loading / unloading platform 10.

[0078] Although the present invention has been disclosed with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art may make various modifications and alterations without departing from the spirit and scope of the invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A telescopic platform for a combined nucleic acid pretreatment device, wherein, Includes a sampling and testing tube loading and unloading platform, which includes: A workbench includes a hollow section, two opposing side top surfaces and two opposing inner surfaces, two sets of two opposing inner surfaces surround to form the hollow section, and the hollow section is located between the two opposing side top surfaces. A platform includes two opposing sides, each side of which is parallel to two opposing inner sides of the worktable, and the platform covers the hollowed-out portion of the worktable. Two support members are arranged opposite each other and fixed to the bottom of two sides adjacent to the platform. Each of the two support members is parallel to two opposite inner sides of the platform. Two slide rails, each slide rail being arranged opposite to and respectively fixed to the two support members; and Two sliders are arranged opposite each other and each has a groove. The grooves of the two sliders respectively mate with the two slide rails, and the two slide rails are located in the grooves of the two sliders respectively. The two slide rails and the two sliders together form a linear slide rail.

2. The telescopic platform of the combined nucleic acid pretreatment device according to claim 1, wherein, The grooves of the two sliders face away from each other.

3. The telescopic platform of the combined nucleic acid pretreatment device according to claim 1, wherein, The platform also includes two support frames, each of which is disposed between two opposite sides of the platform and is parallel to the two opposite sides of the platform, extending from one end of the platform to the opposite end.

4. The telescopic platform of the combined nucleic acid pretreatment device according to claim 1, wherein, The platform also includes a pull plate; the pull plate has a handle disposed on the surface of the pull plate; the pull plate is fixed to the surface of the platform and covers a portion of the platform and a portion of the two support frames.

5. The telescopic platform of the combined nucleic acid pretreatment device according to claim 3, wherein, The sampling and inspection tube loading and unloading platform also includes at least one first positioning pin and at least one second positioning pin. The first positioning pin and the second positioning pin are disposed on the support frame or the platform, and the first positioning pin and the second positioning pin are disposed opposite to each other or diagonally. The size of the first positioning pin is different from the size of the second positioning pin.

6. The telescopic platform of the combined nucleic acid pretreatment device according to claim 5, wherein, The number of the first locating pin is one, and the number of the two locating pins is one.

7. The telescopic platform of the combined nucleic acid pretreatment device according to claim 1, wherein, The platform also includes a positioning detection component, which is disposed on one side of the platform.

8. The telescopic platform of the combined nucleic acid pretreatment device according to claim 7, wherein, The positioning and detection component is a metal sheet.

9. The telescopic platform of the combined nucleic acid pretreatment device according to claim 1, wherein, It also includes two parallelism adjustment components, each of which is arranged opposite to each other and includes a base plate, a side plate, at least two first threads and at least two second threads. The base plate and the side plate are connected in an L-shape. The base plates of the two parallelism adjustment components are fixed to the worktable and are adjacent to the inner side of the worktable and located below the platform. The at least two first threads are disposed on the base plates of the two parallelism adjustment components, and the at least two second threads are disposed on the side plates of the two parallelism adjustment components.

10. The telescopic platform of the combined nucleic acid pretreatment device according to claim 1, wherein, It also includes two positioning components, each of which is arranged opposite to each other and includes a fixed seat and a positioning bead; the fixed seat is disposed on the outer side of the support of the sampling tube loading and unloading platform; the fixed seat has a recess; the positioning bead is disposed on the side top surface of the worktable, and the positioning bead includes a round bead, the round bead of which is located in the recess of the fixed seat.

11. The telescopic platform of the combined nucleic acid pretreatment device according to claim 10, wherein, It also includes two blocking components, each of which is arranged opposite to each other and includes a first abutment and a first stop. The first abutment is disposed on the outer side of the support of the loading and unloading platform of the sampling tube and is adjacent to the fixed seat; the first stop is disposed on the side top surface of the workbench and is adjacent to the positioning bead; the first abutment abuts against the first stop.

12. The telescopic platform of the combined nucleic acid pretreatment device according to claim 11, wherein, It also includes two height limiting components, each of which is arranged opposite to each other and includes a second stop and a second abutment. The second stop is disposed on the outer side of the support of the sampling tube loading and unloading platform, and is adjacent to the side of the first abutment adjacent to the fixed seat. The second abutment is disposed on the side top surface of the worktable, and is adjacent to the side of the first stop adjacent to the positioning bead. The second abutment includes a roller, and the top of the roller of the second abutment abuts against the bottom of the second stop.

13. The telescopic platform of the combined nucleic acid pretreatment device according to claim 12, wherein, It also includes a photoelectric sensor, which is disposed on the top side of the worktable and is adjacent to the other side of the second abutment member and the first stop member.

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