Hand plate model measuring device

Abstract

The utility model relates to the field of hand plate detection, in particular to a hand plate model measuring device which comprises an adjusting frame, a supporting piece, a measuring assembly, a roller and a filling assembly. The adjusting frame is provided with the supporting piece in a sliding mode and used for adjusting the position of the supporting piece in a first plane. The measuring assembly is slidably arranged on the supporting piece in the Z direction, the Z direction intersects with the first plane, the roller is rotatably arranged at one end of the measuring assembly, the roller is used for abutting against a hand plate model to be measured, and the measuring assembly is used for measuring the position of the roller in the Z direction; the filling assembly is arranged on the side, away from the measuring assembly, of the roller, and the filling assembly is used for filling the hollowed-out part of the hand plate model. The hand plate model measuring device is simple to use, high in detection efficiency, capable of adapting to hand plate models of different types and different specifications, and high in applicability.

Description

Technical Field

[0001] The utility model relates to the field of hand plate detection, and more specifically, to a hand plate model measuring device. Background Art

[0002] Usually, products that have just been developed or designed need to be prototyped. Prototypes are the first step to verify the feasibility of the product. It is the most direct and effective way to find out the defects, deficiencies, and drawbacks of the designed product, so as to make targeted improvements to the defects until no deficiencies can be found from individual prototypes.

[0003] After the design is completed, the product is usually not perfect or even unusable, so some prototypes need to be made for measurement. At the beginning, the dimensions around the prototype were usually measured manually, which was troublesome to operate and had large errors. Later, a measuring device for replica prototypes was derived, which could simply measure the length and width of the prototype. When it was applied to prototypes of different sizes at different heights, the measurement accuracy dropped sharply.

[0004] Later, a Chinese utility model patent with publication number CN213748212U disclosed a flexible gauge for a prototype model, which can measure the thickness at different positions and the depth of a smaller diameter groove by setting a measuring mechanism and a needle bar. However, when measuring multiple different points, the flexible gauge needs to reciprocate to adjust the position of the needle bar, and the needle bar needs to move up and down reciprocatingly, which is complicated to use and has low detection efficiency.

[0005] Therefore, it is necessary to design a hand-plate model measuring device which is easy to use and has high detection efficiency. Utility Model Content

[0006] The main purpose of the utility model is to provide a hand-plate model measuring device, aiming to solve the problems of complicated use and low detection efficiency of the hand-plate model measuring device in the prior art.

[0007] In order to solve the above technical problems, a hand model measuring device is proposed, which is used to measure a hand model with hollowing, including: an adjustment frame, a support, a measuring component, a roller and a filling component;

[0008] The adjustment frame is slidably provided with the support member, and is used to adjust the position of the support member in the first plane;

[0009] The measuring component is slidably arranged on the supporting member along the Z direction, the Z direction intersects with the first plane, the roller is rotatably arranged at one end of the measuring component, the roller is used to abut against the hand model to be measured, and the measuring component is used to measure the position of the roller in the Z direction;

[0010] The filling component is arranged on a side of the roller away from the measuring component, and the filling component is used to fill the hollowing of the prototype model.

[0011] In any of the above technical solutions, further, the filling assembly includes a fixed frame and at least one movable part;

[0012] The fixing frame is provided with at least one fixing hole, and the movable member is movably arranged in the fixing hole. One end of the movable member close to the roller is used to fill the hollow part of the prototype model.

[0013] In any of the above technical solutions, further, the movable members are arranged in N numbers along the first direction, and the movable members are arranged in M ​​numbers along the second direction, N is greater than or equal to 2, and M is greater than or equal to 2;

[0014] A second plane where the first direction and the second direction are located is parallel to the first plane;

[0015] The number of the fixing holes is equal to the number of the movable parts, and each of the movable parts is movably arranged in each of the fixing holes.

[0016] In any of the above technical solutions, further, the fixing hole is a strip-shaped hole, and there are two strip-shaped holes extending in different directions.

[0017] In any of the above technical solutions, further, at least one of the movable parts is provided with an elastic part at one end close to the roller, and the elastic part is used to fill the hollow of the prototype model;

[0018] The length of the elastic portion in the first direction is smaller than the length of the roller in the first direction;

[0019] And / or, the length of the elastic portion in the second direction is smaller than the length of the roller in the second direction.

[0020] In any of the above technical solutions, optionally, it also includes an airbag and an inflation mechanism;

[0021] The airbag is arranged at one end of the movable part close to the roller, and the airbag is connected with the inflation mechanism. The inflation mechanism is used to control the saturation of the airbag, and the airbag is used to fill the hollow of the prototype model.

[0022] In any of the above technical solutions, further, it also includes a frame and a locking member;

[0023] The adjustment frame is slidably arranged on the frame along a W direction, and the W direction intersects with the first plane;

[0024] The adjustment frame is provided with a locking hole, the locking member is arranged in the locking hole, and the locking member is used to fix the adjustment frame.

[0025] In any of the above technical solutions, further, the measuring assembly includes a slide rail and a measuring instrument;

[0026] The slide rail is slidably arranged on the support member along the Z direction, the roller is rotatably arranged on one end of the measuring component, the measuring instrument is arranged on the slide rail, and the measuring instrument is used to measure the position of the roller in the Z direction.

[0027] When in use, the hand model to be measured is set on the filling component, and the filling component is adjusted accordingly, so that the filling component is partially filled in the hollow part of the hand model, so that the roller is supported by the filling component filled there when passing through the hollow part, so as to avoid the roller from sinking into the hollow part when moving to the hollow part. Then, by adjusting the position of the support frame on the adjustment frame, the measuring component is moved to a point corresponding to the hand model to be measured. At this time, the roller is attached to the hand model to be measured, and the support is pushed to make the roller move on the surface of the hand model. At the same time, the position difference of the hand model in the Z direction under the moving path is measured by the measuring component.

[0028] The beneficial effects are:

[0029] 1. When the hand model measuring device of the present application is used, after the filling component is used to fill the hollow part of the hand model to be measured, the position difference of different parts of the hand model in the Z direction can be obtained by moving the support member. The device is easy to use and has high detection efficiency.

[0030] 2. The hand-board model measuring device of the present application can handle hand-board models of various types and specifications, and has high applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 It is a three-dimensional structural schematic diagram of a hand model measuring device in one embodiment of the utility model;

[0033] Figure 2 It is a front view structural schematic diagram of a hand model measuring device in one embodiment of the utility model;

[0034] Figure 3It is a schematic diagram of the top view of the structure of a hand model measuring device in one embodiment of the utility model;

[0035] Figure 4 This is an application schematic diagram of a hand-plate model measuring device in one embodiment of the utility model;

[0036] Figure 5 It is a structural schematic diagram of a filling component in another embodiment of the utility model;

[0037] Figure 6 It is a front view structural schematic diagram of a hand model measuring device in another embodiment of the utility model.

[0038] The following are the descriptions of the reference numerals:

[0039] 1. Adjust the frame;

[0040] 2. Support parts;

[0041] 3. Measuring assembly; 301. Slide rail; 302. Measuring instrument;

[0042] 4. Roller;

[0043] 5. Filling assembly; 501. Fixed frame; 502. Moving part; 503. Elastic part;

[0044] 6. Airbag;

[0045] 7. Trachea;

[0046] 8. Framework;

[0047] 9. Locking parts;

[0048] 10. Prototype model. DETAILED DESCRIPTION

[0049] Below, the example embodiments according to the present application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application, and it should be understood that the present application is not limited to the example embodiments described herein. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0050] It should be noted that, as shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "a kind" and / or "the" do not specifically refer to the singular, but may also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of clearly identified steps and elements, and these steps and elements do not constitute an exclusive list, and the method or device may also include other steps or elements.

[0051] If the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0052] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0054] The utility model proposes a hand model measuring device, which is mainly used for measuring a hand model with a hollow part. The hollow part of the hand model is filled with a filling component, and then the hand model can be measured by simply pushing or moving a supporting part. The device is easy to use and has high detection efficiency.

[0055] The prototype model measuring device of the present application is described in detail through the following embodiments.

[0056] Embodiment 1:

[0057] In this embodiment, if Figures 1 to 4 As shown, the hand model measuring device includes: an adjustment frame 1, a support member 2, a measuring component 3, a roller 4 and a filling component 5;

[0058] The adjustment frame 1 is slidably provided with a support member 2, which is used to adjust the position of the support member 2 in the first plane;

[0059] The measuring component 3 is slidably arranged on the support member 2 along the Z direction, the Z direction intersects with the first plane, and the roller 4 is rotatably arranged at one end of the measuring component 3, the roller 4 is used to abut against the hand model 10 to be measured, and the measuring component 3 is used to measure the position of the roller 4 in the Z direction;

[0060] The filling component 5 is arranged on a side of the roller 4 away from the measuring component 3 , and the filling component 5 is used to fill the hollowing of the prototype model 10 .

[0061] In the present technical solution, the first plane is usually a horizontal plane, the Z direction is usually a vertical direction, and the roller 4 is a spherical body or a cylindrical body. The adjustment frame 1 is two mutually perpendicular support rod slider assemblies, and the support member 2 is a block structure. The support member 2 is fixed or integrally arranged on the slider of the adjustment frame 1. The adjustment frame 1 can adjust the position of the support member 2 in the horizontal plane, that is, adjust the position of the support member 2 forward, backward, left or right.

[0062] The right end face of the support 2 is provided with a slide rail guide, and the measuring component 3 is provided with a slide groove adapted to the aforementioned slide rail guide, so that the measuring component 3 can slide up and down along the slide rail guide. The roller 4 is a spherical body, and the roller 4 can be freely rotated and clamped on the lower side end of the measuring component 3. During measurement, the roller 4 is used to abut against the surface of the hand model 10 to be measured. When the roller 4 abuts at different positions, the length of the measuring component 3 extending to the upper side of the support 2 is different, and then the height difference of different positions of the hand model 10 can be known through the different lengths. In order to obtain the height difference more intuitively, numbers can be engraved on the side of the measuring component 3.

[0063] The filling component 5 is located at the lower side of the support member 2 and has a certain distance from the support member 2, and is used to place the hand model 10 to be measured. The filling component 5 includes a fixed frame 501 and at least one movable member 502; the fixed frame 501 is provided with at least one fixed hole, and the movable member 502 is movably arranged in the fixed hole, and the end of the movable member 502 close to the roller 4 is used to fill the hollow part of the hand model 10.

[0064] Specifically, in the present technical solution, the fixing frame 501 is arranged at the lower side of the support member 2, and there is a certain distance between the fixing frame 501 and the support member 2. The fixing frame 501 is a structure with a support platform on the upper side and support legs on the lower side, so that there is also a certain distance between the support platform of the fixing frame 501 and the lower support plane of the fixing frame 501, which is used to adjust the upper and lower positions of the movable member 502, and the fixing hole passes through the support platform on the upper side of the fixing frame 501. The movable member 502 is a rod-shaped structure, which is slidably arranged in the fixing hole up and down, and the top of the movable member 502 needs to be moved to the hollow part of the hand model 10 when in use to support the roller 4.

[0065] In certain usage scenarios, for example, in a scenario where the hand model 10 to be measured has only one hollowed-out portion, only one movable part 502 is required.

[0066] Usually, the movable parts 502 are arranged in a plurality in a rectangular array, which can better adapt to the hand-plate models 10 with different sizes of hollows or different numbers of hollows, thereby improving the application range of the measuring device.

[0067] Specifically, in the present technical solution, the number of movable parts 502 is N along the first direction, and the number of movable parts 502 along the second direction is M, N is greater than or equal to 2, and M is greater than or equal to 2; the second plane where the first direction and the second direction are located is parallel to the first plane; the number of fixing holes is equal to the number of movable parts 502, and each movable part 502 is movably arranged in each fixing hole.

[0068] In the technical solution, the first direction is the left-right direction, the second direction is the front-back direction, and N and M are both 10. The second plane is located below the first plane and is parallel to the first plane. The movable members 502 are set to 100, which are slidably connected to each fixing hole one by one.

[0069] When in use, a portion of the movable part 502 that hinders the placement of the hand model 10 is moved downward, so that the hand model 10 can be placed on the supporting platform of the fixed frame 501; and another portion of the movable part 502 corresponding to the hollow part of the hand model 10 is lifted upward, so that the top of the movable part 502 of this portion is located in the hollow part of the hand model 10, and the top of the movable part 502 of this portion is flush with the surface of the hand model 10, and then the support part 2 can be moved to make the roller 4 move on the surface of the hand model 10, so as to measure the height of different positions of the hand model 10 through the measuring component 3.

[0070] Specifically, when the roller 4 gradually moves from a lower position of the hand model 10 to a higher position, the roller 4 gradually moves the measuring component 3 upward under the reaction force of the surface of the hand model 10, and the length of the measuring component 3 extending to the upper side of the support 2 gradually increases; conversely, when the roller 4 gradually moves from a higher position of the hand model 10 to a lower position, the roller 4 always adheres to the surface of the hand model 10 under the action of the gravity of the measuring component 3 itself, and the length of the measuring component 3 extending to the upper side of the support 2 gradually decreases. It is worth noting that the scale here is marked based on the position of the support 2 in space or in height. In actual use, the numbers on the measuring component 3 can be marked based on any position on the device or in space.

[0071] In addition, a spring can be arranged at the end of the measuring component 3 away from the roller 4, and the other end of the spring abuts against a side wall above the measuring device, so that the measuring component 3 is subjected to an elastic force approaching the filling component 5. In this way, the measuring component 3 replaces its own gravity with the elastic force, so that the measuring device can measure the position of the roller 4 in the left and right direction or the front and back direction. At this time, the Z direction is the front and back direction or the left and right direction.

[0072] In this embodiment, if Figures 1 to 4 As shown, the fixing holes are strip-shaped holes, and there are two strip-shaped holes extending in different directions.

[0073] In the present technical solution, the strip holes are also called waist holes, a part of the strip holes extend in the left-right direction, and another part of the strip holes extend in the front-back direction. Specifically, the extending directions of every two adjacent strip holes are different.

[0074] This makes it easy to adjust the position of the movable part 502 left and right and front and back, so that the movable part 502 can better correspond to the hollow part of the prototype model 10, thereby improving the filling saturation and reducing the jamming degree during movement.

[0075] In this embodiment, if Figures 1 to 4 As shown, at least one movable member 502 is provided with an elastic portion 503 at one end close to the roller 4, and the elastic portion 503 is used to fill the hollow of the prototype model 10;

[0076] The length of the elastic portion 503 in the first direction is smaller than the length of the roller 4 in the first direction;

[0077] And / or, the length of the elastic portion 503 in the second direction is smaller than the length of the roller 4 in the second direction.

[0078] In the present technical solution, each movable part 502 is provided with an elastic part 503 at the top thereof, and the elastic part 503 is made of a polymer material and has elastic deformation capability. The elastic part 503 is hemispherical, that is, the length of the elastic part 503 in the first direction is equal to the length in the second direction, and the roller 4 is spherical, and the radius of the elastic part 503 is smaller than the radius of the roller 4. The elastic part 503 is arranged in this way so that the movable part 502 can better fill the hollow part of the prototype model 10.

[0079] In some other technical solutions, the elastic portion 503 is ellipsoidal, the longer radius of the ellipsoidal elastic portion 503 is larger than the radius of the roller 4 , and the shorter radius of the ellipsoidal elastic portion 503 is smaller than the radius of the roller 4 .

[0080] Furthermore, the fixing hole is set as a stepped hole, and the elastic part 503 is stored through one step, and the movable part 502 is clamped and guided through another step. In this way, the elastic part 503 of the movable part 502 that hinders the placement of the hand model 10 can be moved into the stepped hole, so that the hand model 10 can be better placed on the support platform of the fixing frame 501.

[0081] In this embodiment, if Figures 1 to 4 As shown, it also includes a frame 8 and a locking member 9;

[0082] The adjustment frame 1 is slidably arranged on the frame 8 along the W direction, and the W direction intersects with the first plane; the adjustment frame 1 is provided with a locking hole, and a locking member 9 is arranged in the locking hole, and the locking member 9 is used to fix the adjustment frame 1.

[0083] In the present technical solution, the W direction is the vertical direction, which is perpendicular to the first plane. The frame 8 is provided with four vertically arranged guide columns. The adjustment frame 1 is slidably arranged on the guide columns up and down. The locking member 9 is usually arranged as a bolt, and the locking hole is provided with a thread adapted to the bolt, so that the height of the adjustment frame 1 in the space can be adjusted.

[0084] Furthermore, a threaded hole is provided on the slider of the adjustment frame 1, and the adjustment frame 1 includes a bolt adapted to the threaded hole, so as to lock the relative position of the slider in the adjustment frame 1 and stabilize the moving path of the roller 4 during measurement.

[0085] Embodiment 2

[0086] The difference between this embodiment and the first embodiment is that:

[0087] In this embodiment, if Figures 1 to 5 As shown, it also includes an air bag 6 and an inflation mechanism (not shown);

[0088] The airbag 6 is arranged at one end of the movable part 502 close to the roller 4 , and the airbag 6 is connected to the inflation mechanism, the inflation mechanism is used to control the saturation of the airbag 6 , and the airbag 6 is used to fill the hollow of the prototype model 10 .

[0089] In the present technical solution, the airbag 6 is a balloon-like elastically deformable structure, the airbag 6 is fixed at the top of the movable part 502, the air inlet and outlet of the airbag 6 are connected to the inflation mechanism through the trachea 7, the inflation mechanism (not shown in the figure) is an air pump, and the inflation mechanism inflates the airbag 6 when it is turned on, and the airbag 6 is deflated by the external air pressure when it is closed. When in use, the airbag 6 is placed in correspondence with the hollow part of the hand model 10, the inflation mechanism is turned on to inflate the airbag 6 to a certain degree, and then closed, the airbag 6 is restricted by the side wall of the hand model 10 at the hollow part and deformed to fill the hollow part, and can support the roller 4 moving to this part.

[0090] Changing the elastic part 503 to a combination of the airbag 6 and the inflation mechanism can make use of the high deformation property of the airbag 6 to better fill the hollow part, thereby better improving the filling saturation and smoothness during mobile measurement.

[0091] Specifically, in order to simplify the complexity of the air path, the movable part 502 is set to a hollow structure, and the air pipe 7 connected to the airbag 6 is connected to the bottom end of the movable part 502 to indirectly supply air to the airbag 6.

[0092] Embodiment 3

[0093] The difference between this embodiment and the first embodiment is that:

[0094] In this embodiment, if Figures 1 to 6 As shown, the measuring assembly 3 includes a slide rail 301 and a measuring instrument 302;

[0095] The slide rail 301 is slidably disposed on the support member 2 along the Z direction, the roller 4 is rotatably disposed at one end of the measuring component 3, and the measuring instrument 302 is disposed on the slide rail 301, and the measuring instrument 302 is used to measure the position of the roller 4 in the Z direction.

[0096] In the present technical solution, the Z direction is the vertical direction, and the measuring instrument 302 is a one-dimensional automatic digital height measuring instrument, which can be purchased on the market. The roller 4 is rotatably connected to the bottom end of the slide rail 301, and the measuring instrument 302 is fixed to one side of the slide rail 301. When in use, the height difference between the current position of the roller 4 and the preset position is directly displayed by the measuring instrument 302. Compared with the measuring component 3 engraved with numbers, the measuring device of this embodiment has higher accuracy and more direct measurement results.

[0097] The embodiments of the present disclosure have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A hand model measuring device, used for measuring a hand model with a hollow, characterized in that: include: An adjustment frame (1), a support member (2), a measuring assembly (3), a roller (4) and a filling assembly (5); The adjustment frame (1) is slidably provided with the support member (2) and is used to adjust the position of the support member (2) in the first plane; The measuring component (3) is slidably arranged on the support member (2) along a Z direction, the Z direction intersects with the first plane, the roller (4) is rotatably arranged on one end of the measuring component (3), the roller (4) is used to abut against a hand model to be measured, and the measuring component (3) is used to measure the position of the roller (4) in the Z direction; The filling component (5) is arranged on a side of the roller (4) away from the measuring component (3), and the filling component (5) is used to fill the hollowing of the prototype model; The filling assembly (5) comprises a fixed frame (501) and at least one movable part (502); The fixing frame (501) is provided with at least one fixing hole, and the movable member (502) is movably arranged in the fixing hole, and one end of the movable member (502) close to the roller (4) is used to fill the hollow part of the prototype model; The movable members (502) are arranged in N numbers along the first direction, and the movable members (502) are arranged in M ​​numbers along the second direction, N is greater than or equal to 2, and M is greater than or equal to 2; A second plane where the first direction and the second direction are located is parallel to the first plane; The number of the fixing holes is equal to the number of the movable parts (502), and each movable part (502) is movably arranged in each fixing hole.

2. The hand model measuring device according to claim 1, characterized in that: The fixing holes are strip-shaped holes, and there are two strip-shaped holes extending in different directions.

3. The hand model measuring device according to claim 1, characterized in that: At least one of the movable parts (502) is provided with an elastic part (503) at one end close to the roller (4), and the elastic part (503) is used to fill the hollow of the prototype model.

4. The hand model measuring device according to claim 1, characterized in that: Also includes an air bag (6) and an inflation mechanism; The airbag (6) is arranged at one end of the movable part (502) close to the roller (4), and the airbag (6) is connected to the inflation mechanism, the inflation mechanism is used to control the saturation of the airbag (6), and the airbag (6) is used to fill the hollow of the prototype model.

5. The hand model measuring device according to claim 1, characterized in that: It also includes a frame (8) and a locking member (9); The adjustment frame (1) is slidably arranged on the frame (8) along a W direction, and the W direction intersects with the first plane; The adjustment frame (1) is provided with a locking hole, the locking member (9) is arranged in the locking hole, and the locking member (9) is used to fix the adjustment frame (1).

6. The hand model measuring device according to claim 1, characterized in that: The measuring assembly (3) comprises a slide rail (301) and a measuring instrument (302); The slide rail (301) is slidably arranged on the support member (2) along the Z direction, the roller (4) is rotatably arranged at one end of the measuring component (3), and the measuring instrument (302) is arranged on the slide rail (301), and the measuring instrument (302) is used to measure the position of the roller (4) in the Z direction.

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