Detection tool for front cross beam of automobile top cover

Abstract

The invention discloses a testing fixture for a front cross beam of an automobile top cover, and belongs to the technical field of testing fixtures. Comprising a workbench, and a profiling cushion table, a go / no-go gauge, a surface difference gauge, a plug gauge, a plurality of pressing clamps, a profiling turnover gauge and two turnover positioning fixtures which are arranged on the workbench, the front end of the top of the profiling cushion table is provided with a convex edge, and the middle of the rear end of the top of the profiling cushion table is provided with a positioning boss matched with a positioning upper flange in the middle of the rear contour of the top cover front cross beam; the profiling turnover testing fixture and the turnover positioning fixtures are both located behind the profiling cushion table, and the two turnover positioning fixtures are arranged side by side in the left-right direction and located on the left edge and the right edge of a groove in the middle of the top cover front cross beam respectively. The profiling turnover testing fixture is located between the two turnover positioning fixtures, and a T-shaped block is arranged on a turnover arm of the profiling turnover testing fixture; three detection pins are arranged at the end parts of three arms of the T-shaped block and are positioned at three bulges in the middle of the top cover front cross beam; and insertion holes for corresponding plug gauges to pass through are formed in the junction of the three arms and are positioned right above the mounting holes in the middle of the top cover front cross beam.

Description

Technical Field

[0001] The present invention belongs to the technical field of inspection tools, and particularly relates to an inspection tool for the front cross beam of an automobile roof panel. Background Art

[0002] As an important structural component of an automobile, the front cross beam of the roof panel plays a role in supporting and strengthening the roof panel. At the same time, there are installation holes for the ceiling, front dome light, electrical wiring harness, etc. on the front cross beam of the roof panel, which play an important installation role. Since there are a large number of installation holes on the front cross beam of the roof panel, it is necessary to detect them through an inspection tool. For example, the patent with the application number CN201911336789.7 discloses an inspection tool for detecting the welded assembly of the front cross beam of an automobile roof panel, including a bottom plate, a go-no-go gauge, a surface difference gauge, a positioning mechanism, five fixed detection blocks, four clamping pliers, two movable detection blocks, two flipping mechanisms and movable detection pins, wherein: one measurement reference block is respectively arranged at the four corners of the upper surface of the bottom plate; the go-no-go gauge and the surface difference gauge are respectively arranged on the bottom plate; the five fixed detection blocks are respectively a first fixed detection block, a second fixed detection block, a third fixed detection block, a fourth fixed detection block and a fifth fixed detection block, and the first to fifth fixed detection blocks are sequentially arranged in the middle of the upper surface of the bottom plate from left to right; the positioning mechanism includes a main positioning pin, a sub-positioning pin and four positioning surfaces, the main positioning pin is arranged in the middle of the top end of the fifth fixed detection block, and the sub-positioning pin is arranged in the middle of the top end of the first fixed detection block; two of the positioning surfaces are arranged one in front of the other at the top end of the first fixed detection block; the other two positioning surfaces are arranged one in front of the other at the top end of the fifth fixed detection block; each clamping plier is arranged on the bottom plate through a plier support, and the four clamping pliers and the four positioning surfaces are arranged in one-to-one correspondence, and the clamping end of each clamping plier is located directly above the corresponding positioning surface; the two movable detection blocks are respectively located at the top ends of the second fixed detection block and the fourth fixed detection block in one-to-one correspondence; the two movable detection blocks are respectively connected with the two flipping mechanisms, and each flipping mechanism is arranged on the bottom plate through a flipping mechanism support; the movable detection pins are detachably arranged on each fixed detection block and movable detection block.

[0003] This patent needs to set multiple positioning mechanisms, including a main positioning pin, a sub-positioning pin and four positioning surfaces. The positioning structure is complex. The present patent simplifies the positioning mechanism for the front cross beam of the automobile roof panel with a special structure. Summary of the Invention

[0004] In order to solve the foregoing problems, an embodiment of the present invention provides an inspection tool for the front cross beam of an automobile roof panel. By slightly adjusting the front cross beam of the roof panel, the inspection tool can achieve rapid positioning and clamping of the front cross beam of the roof panel. The technical solution is as follows: An embodiment of the present invention provides a fixture for the front cross member of an automobile roof panel, including a workbench and a profiling pad 1, a go-no-go gauge 2, a surface difference gauge 3, a plug gauge 4, a plurality of clamping clamps 5, a profiling flipping fixture 6 and two flipping positioning fixtures 7 thereon; a convex edge 21 matching the front contour of the front cross member 10 of the roof panel is provided at the front end of the top of the profiling pad 1, and a positioning boss 22 matching the positioning up-turned edge in the middle of the rear contour of the front cross member 10 of the roof panel is provided in the middle of the rear end of its top; the profiling flipping fixture 6 and the flipping positioning fixtures 7 are both arranged on the workbench and are both located behind the profiling pad 1, the two flipping positioning fixtures 7 are arranged side by side left and right and are respectively located at the left and right edges of the groove 11 in the middle of the front cross member 10 of the roof panel; the profiling flipping fixture 6 is located between the two flipping positioning fixtures 7, and a T-shaped block 63 is provided on its flipping arm 62; three detection pins 64 are provided at the ends of the three arms of the T-shaped block 63 and at three protrusions 12 in the middle of the front cross member 10 of the roof panel, and a jack 65 for the corresponding plug gauge 4 to pass through is provided directly above the mounting hole 13 in the middle of the front cross member 10 of the roof panel at the junction of its three arms.

[0005] Among them, the positioning boss 22 in the embodiment of the present invention is arranged in the left-right direction, slopes downward from back to front, and the two front corners thereof are rounded.

[0006] Among them, the profiling pad 1 in the embodiment of the present invention is arranged in the left-right direction, the middle of the front contour of the front cross member 10 of the roof panel arches forward, correspondingly, the middle of the convex edge 21 arches forward; arc-shaped protrusions are provided at both left and right ends of the front contour of the front cross member 10 of the roof panel, correspondingly, arc-shaped grooves 23 matching the arc-shaped protrusions are provided at the rear sides of the corresponding ends of the convex edge 21.

[0007] Specifically, the number of the clamping clamps 5 in the embodiment of the present invention is eight, four clamping clamps 5 are provided in front of and behind the profiling pad 1 respectively, the four clamping clamps 5 in the front are located directly in front of the profiling pad 1 and are arranged side by side left and right, and the four clamping clamps 5 in the rear are located directly behind the profiling pad 1 and are arranged side by side left and right.

[0008] Among them, the flipping positioning fixture 7 in the embodiment of the present invention is arranged along the direction where the edge of the groove 11 is located; the four clamping clamps 5 in the front are respectively located at both left and right ends of the front cross member 10 of the roof panel and in front of the two flipping positioning fixtures 7; the four clamping clamps 5 in the rear are respectively located at both left and right ends of the front cross member 10 of the roof panel and on the adjacent outer sides of the two flipping positioning fixtures 7.

[0009] Specifically, nine plug gauges 4 are provided in the middle of the workbench in the embodiment of the present invention, and four plug gauges 4 are provided at each of its left and right ends.

[0010] More specifically, both the left and right ends of the front cross member 10 of the top cover in the embodiments of the present invention each have four mounting holes 13. The four plug gauges 4 at the end of the workbench are respectively used to detect the four mounting holes 13 at the corresponding end, and one of them is a profiling plug gauge. There are four mounting holes 13 in the groove 11. There are three mounting holes 13 between the left and right ends of the groove 11 and the corresponding ends of the front cross member 10 of the top cover. Three of the nine plug gauges 4 in the middle are used to detect the three mounting holes 13 between the groove 11 and the corresponding ends of the front cross member 10 of the top cover, and one of them is a profiling plug gauge. The remaining six of the nine plug gauges 4 in the middle are used to detect the four mounting holes 13 in the groove 11.

[0011] Specifically, in the embodiments of the present invention, there are three surface difference gauges 3 and four go-no-go gauges 2 provided on the workbench. The four go-no-go gauges 2 are arranged side by side from left to right. They are located in the middle of the workbench and behind the profiling pad 1. There is one surface difference gauge 3 provided on the workbench and in front of the profiling pad 1. There are two other surface difference gauges 3 arranged side by side from left to right and behind the profiling pad 1 on the workbench.

[0012] Among them, the profiling flipping fixture 6 in the embodiments of the present invention includes a first fixture support 61 on the workbench and behind the middle of the profiling pad 1, a flipping arm 62 hinged to the first fixture support 61, and a T-shaped block 63 at the front end of the flipping arm 62. The flipping arm 62 is arranged in the front-rear direction. It is directly above the positioning boss 1, in front of the first fixture support 61, and can flip upward. The T-shaped block 63 includes a transverse arm arranged in the left-right direction and a longitudinal arm arranged in the front-rear direction. The longitudinal arm is in the middle of the front side of the transverse arm. The front end of the flipping arm 62 is fixedly connected to the middle of the transverse arm. Detection pins 64 are provided vertically at both the left and right ends of the transverse arm and the front end of the longitudinal arm. There is a predetermined distance between the detection pins 64 and the corresponding protrusions 12. The jack 65 is located at the junction of the longitudinal arms.

[0013] Among them, the flipping positioning fixture 7 in the embodiments of the present invention includes a second fixture support 71 on the workbench and behind the profiling pad 1 and a clamping plate 72 hinged to the second fixture support 71. The clamping plate 72 is in front of the second fixture support 71. It is arranged along the direction of the edge of the groove 11. A protrusion portion that cooperates with the edge of the groove 11 is provided at the front end of its lower side. It can flip upward. The protrusion portion presses against the edge of the groove 11. Its bottom is inclined downward from back to front. A plurality of arc-shaped notches are arranged side by side in the front-rear direction at its bottom. The outer side of its bottom is a slope that cooperates with the edge of the groove 11. The slope is inclined inward from top to bottom. The beneficial effects brought by the technical solution provided in the embodiment of the present invention are as follows: The embodiment of the present invention provides a fixture for the front cross member of an automobile roof. With a slight adjustment of the front cross member of the roof, this fixture can achieve rapid positioning and clamping of the front cross member of the roof. The profiling and flipping fixture can achieve rapid detection of hole positions and protrusions. In short, the fixture of this patent has a relatively fast detection speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic structural diagram of the fixture for the front cross member of the automobile roof in the embodiment of the present invention; Figure 2 is a schematic structural diagram of the middle part of the profiling pad; Figure 3 is a schematic structural diagram of the end part of the profiling pad; Figure 4 is a schematic structural diagram of the clamping plate; Figure 5 is a schematic structural diagram of a profiling plug gauge; Figure 6 is a schematic structural diagram of another profiling plug gauge.

[0015] In the figure: 1 profiling pad, 2 go-no-go gauge, 3 surface difference gauge, 4 plug gauge, 5 clamping pliers, 6 profiling and flipping fixture, 7 flipping and positioning fixture; 10 front cross member of the automobile roof, 11 groove, 12 protrusion, 13 mounting hole; 21 flange, 22 positioning boss, 23 arc groove; 61 first fixture support, 62 flipping arm, 63 T-shaped block, 64 detection pin, 65 jack; 71 second fixture support, 72 clamping plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] To make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings.

[0017] Embodiment 1 See Figure 1-6 , Embodiment 1 provides a fixture for the front cross member of an automobile roof, including a workbench and a profiling pad 1, a profiling and flipping fixture 6, four go-no-go gauges 2, three surface difference gauges 3, seventeen plug gauges 4, eight clamping pliers 5 and two flipping and positioning fixtures 7, etc. on it.

[0018] Among them, the profiling pad 1 is arranged in the left-right direction, and its shape matches that of the front crossbeam 10 of the top cover. A convex edge 21 that matches the front contour of the front crossbeam 10 of the top cover is provided at the front end of its top. A positioning boss 22 that matches the positioning upward flange in the middle of the rear contour of the front crossbeam 10 of the top cover (the front crossbeam 10 of the top cover has been slightly adjusted for easy positioning and fixing) is provided in the middle of the rear end of its top. The middle of the front contour of the front crossbeam 10 of the top cover arches forward. Correspondingly, the middle of the convex edge 21 arches forward. Arc-shaped protrusions are provided at both the left and right ends of the front contour of the front crossbeam 10 of the top cover (the front crossbeam 10 of the top cover has been slightly adjusted for easy positioning and fixing). Correspondingly, arc-shaped grooves 23 (two in total) that match the arc-shaped protrusions are provided at the rear sides of the corresponding ends of the convex edge 21. The positioning boss 22 is arranged in the left-right direction, the top of which is obliquely downward from the rear to the front, the two corners at its front end are rounded, and its length (in the left-right direction) is short (specifically 1-2 cm).

[0019] Among them, the profiling flipping fixture 6 and the flipping positioning fixture 7 are both arranged on the workbench and are both located behind the profiling pad 1. The two flipping positioning fixtures 7 are arranged side by side left and right, and are respectively located at the left and right edges of the groove 11 in the middle of the front crossbeam 10 of the top cover, and are arranged along the direction where the edge of the groove 11 is located. The profiling flipping fixture 6 is located between the two flipping positioning fixtures 7, and a T-shaped block 63 is provided on its flipping arm 62. Three detection pins 64 are provided at the ends of the three arms of the T-shaped block 63 and are located at the three protrusions 12 in the middle of the front crossbeam 10 of the top cover. An insertion hole 65 (specifically a round hole) for the corresponding plug gauge 4 to pass through is provided directly above the intersection of the three arms of the T-shaped block 63 and is located at the mounting hole 13 in the middle of the front crossbeam 10 of the top cover (the third one from right to left among the four mounting holes 13 in the groove 11).

[0020] Specifically, the profiling flipping fixture 6 in the embodiment of the present invention includes a first fixture support 61 on the workbench and located behind the middle of the profiling pad 1, a flipping arm 62 hinged (through a left-right rotating shaft) on the first fixture support 61, a T-shaped block 63 at the front end of the flipping arm 62, etc. The flipping arm 62 is arranged in the front-rear direction, is located directly above the positioning boss 1, is located at the front side of the first fixture support 61, can maintain a horizontal state, and can flip upward. The T-shaped block 63 includes a transverse arm arranged in the left-right direction and a longitudinal arm arranged in the front-rear direction. The longitudinal arm is located in the middle of the front side of the transverse arm. The front end of the flipping arm 62 is fixedly connected to the middle of the transverse arm. Detection pins 64 are provided vertically at the left and right ends of the transverse arm and the front end of the longitudinal arm. There is a predetermined distance between the detection pins 64 and the corresponding protrusions 12 (which can be detected by a surface difference gauge 3). The insertion hole 65 is located at the intersection of the longitudinal arms.

[0021] Among them, the flipping and positioning fixture 7 in the embodiment of the present invention includes a second fixture support 71 on the workbench and located behind the profiling pad 1, a clamping plate 72 hinged to the second fixture support 71, etc. The clamping plate 72 is located on the front side of the second fixture support 71, is arranged along the direction of the edge of the groove 11, has a protruding portion at the front end of its lower side for cooperating with the edge of the groove 11, and can be flipped upward. The protruding portion presses against the edge of the groove 11, its bottom is inclined downward from back to front, there are a plurality of (specifically two) arc-shaped notches arranged side by side in the front and back of its bottom, and the outer side of its bottom is a slope for cooperating with the edge of the groove 11. The slope is inclined inward from top to bottom. Embodiment 2 See Figure 1 , Embodiment 2 provides a fixture for the front cross member of an automobile roof panel, whose structure is basically the same as that of Embodiment 1, the difference being that: in this embodiment, four pressing clamps 5 are provided in front of and behind the profiling pad 1. The four pressing clamps 5 in the front are located directly in front of the profiling pad 1, are arranged side by side left and right, and are respectively located at the left and right ends of the front cross member 10 of the roof panel and in front of the two flipping and positioning fixtures 7. The four pressing clamps 5 in the back are located directly behind the profiling pad 1, are arranged side by side left and right, and are respectively located at the left and right ends of the front cross member 10 of the roof panel and on the adjacent outer sides of the two flipping and positioning fixtures 7. The pressing clamp 5 is specifically a quick clamp.

[0022] Embodiment 3 See Figure 1 , Embodiment 3 provides a fixture for the front cross member of an automobile roof panel, whose structure is basically the same as that of Embodiment 1, the difference being that: in this embodiment, nine plug gauges 4 are provided in the middle of the workbench, and four plug gauges 4 are provided at each of its left and right ends. Specifically, both the left and right ends of the front cross member 10 of the roof panel have four mounting holes 13. The four plug gauges 4 at the end of the workbench are respectively used to detect the four mounting holes 13 at the corresponding end (two mounting holes 13 need to be detected by two plug gauges 4, and the two plug gauges 4 are reused), and one of them is a profiling plug gauge (as Figure 5 shown). There are four mounting holes 13 in the groove 11, there are three mounting holes 13 between the left and right ends of the groove 11 and the corresponding ends of the front cross member 10 of the roof panel. Three of the nine plug gauges 4 in the middle are used to detect the three mounting holes 13 between the groove 11 and the corresponding ends of the front cross member 10 of the roof panel, and one of them is a profiling plug gauge (as Figure 6 shown), and the remaining six of the nine plug gauges 4 in the middle are used to detect the four mounting holes 13 in the groove 11 (two mounting holes 13 need to be detected by two plug gauges 4). For the mounting holes 13 that need to be detected by two plug gauges 4, they are usually in the state of spot nuts and stamping parts. One plug gauge 4 has only one detection end, and the other plug gauge 4 has two detection ends (one end detects the position degree of the hole, and the other end is a scribing pin).

[0023] Embodiment 4 See Figure 1 Figure 1 , Embodiment 4 provides a checking fixture for the front cross member of an automobile roof cover, whose structure is basically the same as that of Embodiment 1, except that: in this embodiment, the four go-no-go gauges 2 are arranged side by side from left to right, located in the middle of the workbench, behind the profiling pad 1, and arranged along the left-right direction.

[0024] Embodiment 5 See Figure 1 Figure 1 , Embodiment 5 provides a checking fixture for the front cross member of an automobile roof cover, whose structure is basically the same as that of Embodiment 1, except that: on the workbench of this embodiment and in front of the profiling pad 1, there is a surface difference gauge 3 (specifically located at the front left or front right, arranged along the left-right direction), and on the workbench and behind the profiling pad 1, there are two other surface difference gauges 3 arranged side by side from left to right (located at the rear right and rear left respectively, arranged along the front-back direction and left-right direction respectively).

[0025] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A checking fixture for a front cross beam of a car roof, comprising a workbench and a contoured pad (1) thereon, a go / no-go gauge (2), a face difference gauge (3), a plug gauge (4) and a plurality of clamps (5); characterized in that: It also includes a profiling flipping checker (6) and two flipping positioning clamps (7); the front end of the top of the profiling pad (1) is provided with a convex edge (21) that matches the front contour of the front cross beam (10) of the top cover, and the middle of the rear end of the top is provided with a positioning boss (22) that matches the positioning upper flange in the middle of the rear contour of the front cross beam (10) of the top cover; the profiling flipping checker (6) and the flipping positioning clamp (7) are both arranged on the workbench and are both located behind the profiling pad (1); the two flipping positioning clamps (7) are arranged side by side on the left and right and are respectively located on the top The profiling turning inspection fixture (6) is located between the two turning positioning fixtures (7), and a T-shaped block (63) is provided on the turning arm (62); three detection pins (64) are provided at the ends of the three arms of the T-shaped block (63) and at the three protrusions (12) located in the middle of the front cross beam (10) of the top cover, and a plug hole (65) for the corresponding plug gauge (4) to pass through is provided at the intersection of the three arms and directly above the mounting hole (13) in the middle of the front cross beam (10) of the top cover.

2. The inspection fixture for the front cross beam of the automobile roof according to claim 1, characterized in that: The positioning boss (22) is arranged in the left-right direction, and is arranged obliquely downward from the back to the front, and the two corners at the front end are rounded.

3. The inspection fixture for the front cross beam of the automobile roof according to claim 1, characterized in that: The contoured pad (1) is arranged in the left-right direction, the middle part of the front contour of the front cross beam (10) of the top cover is arched forward, and correspondingly, the middle part of the convex edge (21) is arched forward; the left and right ends of the front contour of the front cross beam (10) of the top cover are both provided with arc-shaped protrusions, and correspondingly, the rear side of the corresponding end of the convex edge (21) is provided with an arc-shaped groove (23) that cooperates with the arc-shaped protrusion.

4. The inspection fixture for the front cross beam of the automobile roof according to claim 1, characterized in that: The number of the clamping clamps (5) is eight, and four clamping clamps (5) are respectively arranged in front and rear of the profiling pad (1). The four clamping clamps (5) in front are located directly in front of the profiling pad (1) and are arranged side by side on the left and right, and the four clamping clamps (5) in the rear are located directly behind the profiling pad (1) and are arranged side by side on the left and right.

5. The inspection fixture for the front cross beam of the automobile roof according to claim 4, characterized in that: The flip positioning clamp (7) is arranged along the direction of the edge of the groove (11); the four front clamps (5) are respectively located at the left and right ends of the front cross beam (10) of the top cover and in front of the two flip positioning clamps (7); the four rear clamps (5) are respectively located at the left and right ends of the front cross beam (10) of the top cover and adjacent outer sides of the two flip positioning clamps (7).

6. The inspection fixture for the front cross beam of the automobile roof according to claim 1, characterized in that: Nine plug gauges (4) are arranged in the middle of the workbench, and four plug gauges (4) are arranged at each of the left and right ends.

7. The inspection fixture for the front cross beam of the automobile roof according to claim 6, characterized in that: The left and right ends of the front cross beam (10) of the top cover each have four mounting holes (13); the four plug gauges (4) at the end of the workbench are respectively used to detect the four mounting holes (13) at the corresponding ends, and one of them is a profile plug gauge; the groove (11) has four mounting holes (13); three mounting holes (13) are provided between the left and right ends of the groove (11) and the corresponding ends of the front cross beam (10) of the top cover; three of the nine plug gauges (4) in the middle are used to detect the three mounting holes (13) between the groove (11) and the corresponding ends of the front cross beam (10) of the top cover, and one of them is a profile plug gauge; and the remaining six of the nine plug gauges (4) in the middle are used to detect the four mounting holes (13) in the groove (11).

8. The inspection fixture for the front cross beam of the automobile roof according to claim 1, characterized in that: The workbench is provided with three face difference gauges (3) and four go / no-go gauges (2); the four go / no-go gauges (2) are arranged side by side on the left and right, and are located in the middle of the workbench and behind the profiling pad (1); a face difference gauge (3) is arranged on the workbench and in front of the profiling pad (1), and another two face difference gauges (3) are arranged side by side on the workbench and behind the profiling pad (1).

9. The inspection fixture for the front cross beam of the automobile roof according to claim 1, characterized in that: The profiling flipping inspection fixture (6) comprises a first fixture support (61) on a workbench and located at the rear of the middle of the profiling pad (1), a flipping arm (62) hinged on the first fixture support (61) and a T-shaped block (63) at the front end of the flipping arm (62); the flipping arm (62) is arranged in the front-to-back direction, is located directly above the positioning boss (1), is located at the front side of the first fixture support (61), and can flip upward; the T-shaped block (63) comprises a transverse arm arranged in the left-right direction and a longitudinal arm arranged in the front-to-back direction, the longitudinal arm is located at the middle of the front side of the transverse arm, the front end of the flipping arm (62) is fixedly connected to the middle of the transverse arm, the left and right ends of the transverse arm and the front end of the longitudinal arm are both provided with detection pins (64) in the vertical direction, and there is a predetermined distance between the detection pins (64) and the corresponding protrusions (12); the insertion hole (65) is located at the intersection of the longitudinal arms.

10. The inspection fixture for the front cross beam of the automobile roof according to claim 1, characterized in that: The flip positioning fixture (7) comprises a second fixture support (71) on the workbench and located behind the contour pad (1) and a clamp (72) hinged on the second fixture support (71); the clamp (72) is located on the front side of the second fixture support (71), and is arranged along the direction of the edge of the groove (11), and a protrusion that cooperates with the edge of the groove (11) is provided at the front end of its lower side, and it can be flipped upward; the protrusion is pressed against the edge of the groove (11), and its bottom is arranged obliquely downward from back to front, and a plurality of arc-shaped notches are arranged side by side at the front and back of the bottom, and the outer side of the bottom is an inclined surface that cooperates with the edge of the groove (11); the inclined surface is arranged obliquely inward from top to bottom.

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