Bar Member, Assembled Component and Robot
20170036357 ยท 2017-02-09
Assignee
Inventors
Cpc classification
B25J9/08
PERFORMING OPERATIONS; TRANSPORTING
A63H33/12
HUMAN NECESSITIES
F16H21/00
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
International classification
F16H21/00
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
B25J11/00
PERFORMING OPERATIONS; TRANSPORTING
Abstract
The present invention relates to a bar member, an assembled component comprising the bar member, and a robot comprising the bar member. The bar member has a width and a thickness, wherein the width of the bar member is four times of the thickness thereof, and connecting holes running through the bar member along a thickness direction of the bar member are provided on the bar member. By using the bar member to form an assembled component, the need of conveniently realizing the most variety of movement mechanisms may be satisfied, and the most variety of movement functions may be achieved.
Claims
1. A bar member, wherein: the bar member has a width four times longer than its thickness; and the bar member comprises a set of connecting holes running through the bar member along a thickness direction of the bar member.
2. The bar member in claim 1, wherein: the set of connecting holes comprises a subset of connecting holes A and a subset of connecting holes B; and the dimension of the subset of connecting holes A is greater than the dimension of the subset of connecting holes B.
3. The bar member in claim 2, wherein: a distance between the centers of adjacent connecting holes A is four times longer than the thickness of the bar member; a distance between the centers of adjacent connecting holes B is four times longer than the thickness of the bar member; and a distance between the center of a connecting hole A and the center of an adjacent connecting hole B is four times longer than the thickness of the bar member.
4. The bar member in claim 2, wherein: the bar member is a bent bar member, which includes a bent portion formed in the middle of the bent bar member or formed at both ends of the bent bar member; and the bent portion is bent within a plane vertical to the thickness direction of the bent bar member.
5. The bar member in claim 4, wherein the angle defined by the bent portion is 135.
6. The bar member in claim 2, wherein: the set of connecting holes further comprises a subset of connecting holes C; an edge of each of the connecting holes C includes an enclosed shape defined by successively and sequentially connecting a first line segment, a first semicircular arc, a second line segment and a second semicircular arc; the length of the first line segment is four times longer than the thickness of the bar member; the length of second line segment is four times longer than the thickness of the bar member; the first semicircular arc opens towards the middle of the connecting hole C; the second semicircular arc opens towards the middle of the connecting hole C; the radius of the first semicircular arc is equal to one of the radius of the connecting hole A and the radius of the connecting hole B; and the radius of the second semicircular arc is equal to one of the radius of the connecting hole A and the radius of the connecting hole B.
7. The bar member in claim 6, wherein a connecting hole B, a connecting hole C or both are arranged between a pair of connecting holes A.
8. The bar member in claim 2, wherein: an outer flange is protruded from a sidewall of the bar member on an outside of the subset of connecting holes A; the thickness of the outer flange is the same as the thickness of the bar member; and a distance from an outside edge of the outer flange to the edges of the connecting holes A is the same as a distance from the sidewall of the bar member to the edges of the connecting holes B.
9. An assembled component, comprising a moving member, which includes a fixed member and one of a multi-hole bar member and a multi-hole circular plate, wherein: the width of the multi-hole bar member is four times greater than the thickness of the multi-hole bar member; the multi-hole bar member includes a set of connecting holes running through the multi-hole bar member along a thickness direction of the multi-hole bar member; the multi-hole circular plate has a central hole and a plurality of fixed holes distributed around the central hole and arranged circumferentially; the fixed member comprises a multi-hole plate and a multi-hole bent plate; the thickness of the multi-hole plate is the same as the thickness of the multi-hole bar member; a plurality of fixed holes are arranged in a matrix on the multi-hole plate; a bent portion is formed by bending at least one end of the multi-hole bent plate; and a plurality of fixed holes are distributed on the multi-hole bent plate in a matrix.
10. The assembled member in claim 9, wherein: the set of connecting holes comprises a subset of connecting holes A and a subset of connecting holes B; and the dimension of the subset of connecting holes A is greater than the dimension of the subset of connecting holes B.
11. The assembled member in claim 10, wherein: a distance between the centers of adjacent connecting holes A is four times longer than the thickness of the bar member; a distance between the centers of adjacent connecting holes B is four times longer than the thickness of the bar member; and a distance between the center of a connecting hole A and the center of an adjacent connecting hole B is four times longer than the thickness of the bar member.
12. The assembled member in claim 10, wherein: the bar member is a bent bar member, which includes a bent portion in the middle of the bent bar member or at both ends of the bent bar member; and the bent portion is bent within a plane vertical to the thickness direction of the bent bar member.
13. The assembled member in claim 12, wherein the angle defined by the bent portion is 135.
14. The assembled member in claim 10, wherein: the set of connecting holes further comprises a subset of connecting holes C; an edge of each of the connecting holes C includes an enclosed shape defined by successively and sequentially connecting a first line segment, a first semicircular arc, a second line segment and a second semicircular arc; the length of the first line segment is four times longer than the thickness of the bar member; the length of the second line segment is four times longer than the thickness of the bar member; the first semicircular arc opens towards the middle of the connecting hole C; the second semicircular arc opens towards the middle of the connecting hole C; the radius of the first semicircular arc is equal to one of the radius of the connecting hole A and the radius of the connecting hole B; and the radius of the second semicircular arc is equal to one of the radius of the connecting hole A and the radius of the connecting hole B.
15. The assembled member in claim 14, wherein a connecting hole B, a connecting hole C or both are arranged between a pair of connecting holes A.
16. The assembled member in claim 10, wherein: an outer flange is protruded from a sidewall of the bar member on an outside of the set of connecting holes A; the thickness of the outer flange is the same as the thickness of the bar member; and a distance from an outside edge of the outer flange to the edge of the connecting hole A is the same as a distance from the sidewall of the bar member to the edge of the connecting hole B.
17. An assembled component for teaching purposes, comprising a moving member, a multi-hole circular plate and a fixed member, wherein: the moving member comprises a multi-hole bar member having a width-to-thickness ratio of 4, a multi-hole circular plate having a central hole, and a plurality of fixed holes distributed on a circumferential surface of the multi-hole circular plate; the fixed member includes a plurality of multi-hole plates and a plurality of multi-hole bent plates; the thickness of each of the plurality of multi-hole plates is the same as the thickness of the multi-hole bar member; a plurality of fixed holes are arranged on the multi-hole plates in a matrix; a bent portion is formed by bending at least one end of the multi-hole bent plates; a plurality of fixed holes are distributed on the multi-hole bent plates in a matrix; and the moving member and the fixed member are assembled together through a plurality of connecting members.
18. The assembled component in claim 17, wherein the fixed hole comprises: a connecting hole B, which is circular and has a diameter in the range of from 3 to 3.2 mm; a connecting hole A, which is circular and has a diameter in the range of from 4 to 4.2 mm; a third fixed hole, which is circular and has a diameter in the range of from 10 to 10.2 mm; a connecting hole C, which is strip-shaped and has a longer diameter and a shorter diameter; the longer diameter is in one of ranges from 13 to 13.2 mm and from 14 to 14.2 mm; and the shorter diameter is in one of the ranges from 3 to 3.2 mm and from 4 to 4.2 mm.
19. The assembled component in claim 18, wherein the multi-hole bar member comprises: a first bar member having a connecting hole B and a connecting hole A distributed thereon at intervals; and a second bar member having a connecting hole A at both ends and a connecting hole C adjacent to the connecting hole A.
20. The assembled component in claim 18, wherein: the connecting hole B and the connecting hole C are distributed at intervals; the multi-hole circular plate further comprises a first circular plate and a second circular plate; the first circular plate has a plurality of fixed holes circumferentially arranged on a circumferential surface of the first circular plate; and the second circular plate has transmission teeth on a circumferential edge of the second circular plate.
21. The assembled component in claim 20, wherein: the multi-hole plate further comprises a multi-hole square plate having two circular fixed holes formed along a midline of the multi-hole square plate; the pitch of the fixed hole is four times greater than the thickness of the multi-hole square plate; and two sets of connecting holes C are provided on both sides of the two fixed holes, respectively.
22. The assembled component in claim 21, wherein: the multi-hole bent plate further comprises a first bent member and a second bent member; two ends of the first bent member are vertically bent to form a first bent portion; a plurality of fixed holes are formed on the first bent portions; only one of the ends of the second bent member is vertically bent to form a second bent portion; and a plurality of fixed are formed on the second bent portion holes in a parallel array.
23. The assembled component in claim 19, wherein the flange is formed on both sides of the first bar member corresponding to the connecting hole A.
24. A robot, comprising an assembled component, wherein: the assembled component includes a fixed member and a moving member; the moving member includes one of a multi-hole bar member and a multi-hole circular plate; the multi-hole bar member has a width four times longer than its thickness; the multi-hole bar member comprises a set of connecting holes running through the multi-hole bar member along a thickness direction of the multi-hole bar member; the multi-hole circular plate has a central hole and a plurality of fixed holes distributed around the central hole and arranged circumferentially; the fixed member comprises a multi-hole plate and a multi-hole bent plate; the thickness of the multi-hole plate is the same as the thickness of the multi-hole bar member; a plurality of fixed holes are arranged in a matrix on the multi-hole plate; a bent portion is formed by bending at least one end of the multi-hole bent plate; and a plurality of fixed holes are distributed on the multi-hole bent plate in a matrix.
25. The robot in claim 24, wherein: the set of connecting holes comprises a subset of connecting holes A and a subset of connecting holes B; and the dimension of the subset of connecting holes A is greater than the dimension of the subset of connecting holes B.
26. The robot in claim 25, wherein: a distance between the centers of adjacent connecting holes A is four times longer than the thickness of the bar member; a distance between the centers of adjacent connecting holes B is four times longer than the thickness of the bar member; and a distance between the center of a connecting hole A and the center of an adjacent connecting hole B is four times longer than the thickness of the bar member.
27. The robot in claim 25, wherein: the bar member is a bent bar member, which includes a bent portion in the middle of the bent bar member or at both ends of the bent bar member; and the bent portion is bent within a plane vertical to the thickness direction of the bent bar member.
28. The robot in claim 27, wherein the angle defined by the bent portion is 135.
29. The robot in claim 25, wherein: the set of connecting holes further comprises a subset of connecting holes C; an edge of the connecting holes C includes an enclosed shape defined by successively and sequentially connecting a first line segment, a first semicircular arc, a second line segment and a second semicircular arc; the length of the first line segment is four times longer than the thickness of the bar member; the length of the second line segment is four times longer than the thickness of the bar member; the first semicircular arc opens towards the middle of the connecting hole C; the second semicircular arc opens towards the middle of the connecting hole C; the radius of the first semicircular arc is equal to one of the radius of the connecting hole A and the radius of the connecting hole B; and the radius of the second semicircular arc is equal to one of the radius of the connecting hole A and the radius of the connecting hole B.
30. The robot in claim 29, wherein a connecting hole B, a connecting hole C or both are arranged between a pair of connecting holes A.
31. The robot in claim 25, wherein: an outer flange is protruded from a sidewall of the bar member on an outside of the set of connecting holes A; the thickness of the outer flange is the same as the thickness of the bar member; and a distance from an outside edge of the outer flange to the edge of the connecting hole A is the same as a distance from the sidewall of the bar member to the edge of the connecting hole B.
Description
BRIEF DESCRIPTION OF FIGURES
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DETAILED DESCRIPTION OF THE EMBODIMENTS
[0071] The present invention will be described below in detail with reference to the accompanying drawings, such that those skilled in the art can implement the present invention with reference to the text of the description.
[0072]
[0073] The fixed holes 600 include, for example: connecting holes B 601, which are circular and each have an aperture of 3 mm; connecting holes A 602, which are circular and each have an aperture of 4 mm; third fixed holes 603, which are circular and each have an aperture of 10 mm; and connecting holes C, which are strip-shaped and each have an inner diameter length of 13.2 mm or 14.2 mm and an inner diameter width of 3 mm or 4 mm.
[0074] For example, the fixed holes further include, for example, square holes 605 for fixing an eccentric wheel. The aperture of each of the square holes is for example 15 mm, and round angles inverted by 2.5 mm are formed at four corners of each of the square holes, respectively. For example, the fixed holes further include circular holes each having an aperture of 15 mm, for fixing a driving eccentric wheel.
[0075] As shown in
[0076] The multi-hole bar member 100 further includes at least one second bar member 104, two ends of which are provided with connecting holes A 601, respectively, and also provided with connecting holes C 604 adjacent to the connecting holes A. Strip-shaped connecting holes 604 capable of adjusting a position of the component are provided on the second bar member 104. Thus, it is convenient to realize walking components or arm components for assembling a robot.
[0077] The multi-hole bar member 100 further includes at least one bar member 105, which is for example a bent member, an extension line of at least one end of which forms an included angle of for example 135 with the axis of a main body. Of course, the third bar member may also have an included angle at two ends. The included angle may be formed at one end of the third bar member, or may also be formed at two ends of the third bar member. The multi-hole bar member may also be deformed to be a multi-hole bar member having circular holes each having an aperture of 15 mm on one end thereof. Of course, the circular holes for fixing the driving wheel may also be provided at any middle position of the multi-hole bar member.
[0078] As shown in
[0079] As shown in
[0080] As shown in
[0081] As shown in
[0082] As shown in
[0083] As shown in
[0084] To further understand the summary, features and effects of the present invention, the following embodiments will be helpful.
Embodiment 1
[0085] As shown in
[0086] Through trial and error, the application has found that, when the ratio of the width to thickness of the bar member is 4:1, the need of conveniently realizing the most variety of movement mechanisms may be satisfied, and the most variety of movement functions may be achieved.
[0087] Specifically, the connecting holes include connecting holes A 602 and connecting holes B 601, where the aperture of each of the connecting holes A 602 is greater than that of the connecting holes B 601. For example, the connecting holes A 602 may each have a diameter of 4 mm to 4.2 mm, while the connecting holes B 601 may each have a diameter of 3 mm to 3.2 mm. The size of each hole may refer to
[0088] By providing connecting holes A and B 601 of different sizes, when the same connecting members (for example, bolts 901 or screws) are sheathed with shaft sleeves 902, the relative rotation of connected parts at the connecting through holes may be realized, so that the wear of the connected bar member at these places is reduced while the precision of rotation is ensured. Or, by directly penetrating the connecting members through the smaller connecting holes B 601, the fixation of the connected bar member is realized.
[0089] Further, specifically, a hole center diameter between two adjacent connecting holes A 602, or between two adjacent connecting holes B 601, or between a connecting hole A 602 and a connecting hole B 601 which are adjacent, is four times of the thickness of the bar member. The size may refer to
[0090] By setting the center distance of the holes to be four times of the thickness of the bar member, i.e., to be the same as the width of the bar member, two connected bar members may rotate freely without interference when the bar members are connected through two adjacent holes.
[0091] Specifically, the connecting holes further include connecting holes C 604. An edge of each of the connecting holes C 604 is an enclosed shape formed by successively and sequentially connecting a first line segment, a first semicircular arc, a second line segment and a second semicircular arc. The length of each of the first line segment and the second line segment is four times of the thickness of the bar member. The opening direction of each of the first semicircular arc and the second semicircular arc faces the middle of the connecting holes C 604. The radius of each of the first semicircular arc and the second semicircular arc is equal to that of the connecting holes A 602 or that of the connecting holes B 601. The connecting holes C 604 may refer to the bar member at the lowest part of
[0092] By providing long holes in a shape of the connecting holes C 604, through holes of other parts may be allowed to slide in the connecting holes C 604 after passing through the connecting members, so that the constraint of one degree of freedom is provided to the planar movement of other parts. Moreover, by setting the length of each of the first line segment and the second line segment of each of the connecting holes C 604 to be four times of the thickness of the bar member, it may be directly connected to two adjacent connecting holes A 602 or connecting holes B 601, thereby realizing two-point fixation of a part.
[0093] Furthermore, specifically, there are the connecting holes B 601 and/or the connecting holes C 604 arranged between two of the connecting holes A 602. In
[0094] By providing connecting holes A 602 having a larger aperture on both sides of the connecting holes B and the connecting holes C 604, the connecting holes A 602 may be allowed to be close to the ends of a connecting bar as far as possible, so as to connect other connecting bars by making the most of the length of the connecting bar, so that it is advantageous to expand the movement range.
[0095] Further, specifically, on the bar member, an outer flange is protruded from a sidewall of the bar member on an outside of the connecting holes A 602, where the thickness of the outer flange is the same as that of the bar member, and a distance from an outside edge of the outer flange to the edges of the connecting holes A 602 is a distance from the sidewall of the bar member to the edges of the connecting holes B 601.
[0096] By enlarging the edge of the bar member at a position outside the larger connecting holes A 602, it is advantageous to ensure the material width of the bar member besides the connecting holes A 602 and thus improve the rigidity and intensity of the bar member. Meanwhile, when the bar member is formed by stamping, it is also advantageous ti improve the manufacturability of processing.
Embodiment 2
[0097]
[0098] An assembled component is provided, including a moving member and a fixed member, the moving member includes at least one of a multi-hole bar member and a multi-hole circular plate, the multi-hole bar member being the above-described bar member, the multi-hole circular plate having a central hole and a plurality of fixed holes that are distributed around the central hole and arranged circumferentially; and the fixed member includes a multi-hole plate and a multi-hole bent plate, the thickness of the multi-hole plate being the same as that of the multi-hole bar member, and a plurality of fixed holes arranged in a matrix being provided on the multi-hole plate, and a bent portion being formed by bending at least one end of the multi-hole bent plate, and a plurality of fixed holes being distributed on the multi-hole bent plate in a matrix.
[0099] By using the above-described bar member to form an assembled component and matching with a fixed member having the same thickness, the size is even, and it is convenient to construct robots, teaching aids or movement mechanisms in various forms to research or verify the feasibility of movement mechanisms. By enlarging models assembled by the assembled component in scale to different degrees, specific movement mechanisms may be formed. When these movement mechanisms are applied in production practices, it is advantageous to shorten the development cycle and quicken the development progress of new products.
[0100] Specifically, the assembled component further includes a connecting member for connecting a fixed member and/or a connecting member to a fixed member and/or a connecting member.
[0101] By assembling a connecting member together with the assembled component, a connecting member of an appropriate size may be conveniently found by a user, so as to connect the moving member and/or the fixed member, so that a common connecting member is not needed. Taking lapping a robot as example, for example, if a common bolt or screw is selected, the size may be too large; moreover, when in use, if there is interference to the movement of other parts, it is required to saw off the bolt or screw, so that the workload of lapping will be greatly increased, and the usability of the assembled component is reduced. Therefore, the fixed member and the moving member are mated with connecting members of a special size, so it is ensured that a user may conveniently connect the fixed member and the moving member, without selecting and processing existing connecting members.
[0102] The driving mechanism shown in
Embodiment 3
[0103] A robot is provided with the assembled component.
[0104]
[0105] By using the above-described bar member to form an assembled component and matching with a fixed member having the same thickness, the size is even, and it is convenient to construct robots, teaching aids or movement mechanisms in various forms to research or verify the feasibility of movement mechanisms. By enlarging models assembled by the assembled component in scale to different degrees, specific movement mechanisms may be formed. When these movement mechanisms are applied in production practices, it is advantageous to shorten the development cycle and quicken the development progress of new products.
Embodiment 4
[0106] The difference between this embodiment and Embodiment 1 lies in that the bar member in Embodiment 1 is a straight bar member while the bar member in this embodiment is a bent bar member.
[0107] As shown in
[0108] By bending the middle of the bent bar member in a length direction thereof, the coverage range of the bar member may be expanded, and a bar having a certain bevel is constructed without lapping three straight bar members into a triangle, so that it is greatly convenient to construct a mechanism. For example,
[0109] After the two ends of the bent bar member are bent, the occurrence of the following problem may be avoided. The problem is that there will be interference between a connected part or connecting member and straight bar members because holes close to the ends are connected to other parts when two straight bar members are hinged at ends, such that the included angle between the two straight bar member cannot be rotated to a very small angle. However, after the bent bar member which is bent at ends is employed, a part or connecting member connected to the middle of two bent bar members has no direct influence on rotating the angle between the two bent bar members to a very small angle because the ends are bent, such that the two bent members may be rotated to a smaller included angle, and the rotation range of the relative included angle between two bar members is expanded.
[0110] For example, as shown in
[0111] More specifically, the angle of bending of the bent portion is 135. The presentation of the angle of 135 may refer to
[0112] For the bent bar member which is bent at the ends, the angle of bending is set as 135. Thus, parts connected at the ends may be allowed to have a larger relative movement range while two parts connected to the connecting holes at the ends have a larger angle movement range, and the parts connected at the ends will have no apparent movement interference with parts connected at the second holes from the ends. For the bent bar member which is bent in the middle, it is also possible to have some movement interference between a part connected at the connecting hole of the bent portion and a part connected on one side of the bent portion.
[0113] There are the connecting holes B and/or the connecting holes C arranged between two of the connecting holes A.
[0114] By providing connecting holes A 602 having a larger aperture on both sides of the connecting holes B and the connecting holes C 604, the connecting holes A 602 may be allowed to be close to the ends of a connecting bar as far as possible, so as to connect other connecting bars by making the most of the length of the connecting bar, so that it is advantageous to expand the movement range.
[0115] In addition, on the bent bar member, an outer flange is protruded from a sidewall of the bar member on an outside of the connecting holes A 602, where the thickness of the outer flange is the same as that of the bar member, and a distance from an outside edge of the outer flange to the edges of the connecting holes A 602 is a distance from the sidewall of the bar member to the edges of the connecting holes B 601. The specific structure is as shown in
[0116] By enlarging the edge of the bar member at a position outside the larger connecting holes A 602, it is advantageous to ensure the material width of the bar member besides the connecting holes A 602 and thus improve the rigidity and intensity of the bar member. Meanwhile, when the bar member is formed by stamping, it is also advantageous to improve the manufacturability of processing.
Embodiment 5
[0117]
[0118] An assembled component is provided, including a moving member and a fixed member, the moving member includes at least one of a multi-hole bar member and a multi-hole circular plate, the multi-hole bar member being the above-described bar member, the multi-hole circular plate having a central hole and a plurality of fixed holes that are distributed around the central hole and arranged circumferentially; and the fixed member includes a multi-hole plate and a multi-hole bent plate, the thickness of the multi-hole plate being the same as that of the multi-hole bar member, and a plurality of fixed holes arranged in a matrix being provided on the multi-hole plate, and a bent portion being formed by bending at least one end of the multi-hole bent plate, and a plurality of fixed holes being distributed on the multi-hole bent plate in a matrix.
[0119] By using the above-described bar member to form an assembled component and matching with a fixed member having the same thickness, the size is even, and it is convenient to construct robots, teaching aids or movement mechanisms in various forms to research or verify the feasibility of movement mechanisms. By enlarging models assembled by the assembled component in scale to different degrees, specific movement mechanisms may be formed. When these movement mechanisms are applied in production practices, it is advantageous to shorten the development cycle and quicken the development progress of new products.
[0120] Specifically, the assembled component further includes a connecting member for connecting a fixed member and/or a connecting member to a fixed member and/or a connecting member.
[0121] By assembling a connecting member together with the assembled component, a connecting member of an appropriate size may be conveniently found by a user, so as to connect the moving member and/or the fixed member, so that a common connecting member is not needed. Taking lapping a robot as example, for example, if a common bolt or screw is selected, the size may be too large; moreover, when in use, if there is interference to the movement of other parts, it is required to saw off the bolt or screw, so that the workload of lapping will be greatly increased, and the usability of the assembled component is reduced. Therefore, the fixed member and the moving member are mated with connecting members of a special size, so it is ensured that a user may conveniently connect the fixed member and the moving member, without selecting and processing existing connecting members.
[0122] The clamping mechanism shown in
Embodiment 6
[0123] A robot is provided with the assembled component.
[0124]
[0125] In the shown robot, a single-sided triangle frame is formed by a bar member, a platform for containing an article to be transported is formed by a multi-hole plate member and a bent member, and a mounting platform of a driving motor is formed on the top by using a bent member.
[0126] By using the above-described bar member to form an assembled component and matching with a fixed member having the same thickness, the size is even, and it is convenient to construct robots, teaching aids or movement mechanisms in various forms to research or verify the feasibility of movement mechanisms. By enlarging models assembled by the assembled component in scale to different degrees, specific movement mechanisms may be formed. When these movement mechanisms are applied in production practices, it is advantageous to shorten the development cycle and quicken the development progress of new products.
[0127] The front portion of the clamping mechanism shown in
[0128] Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited thereto. The above specific implementations are merely illustrative but not limiting. A person of ordinary skill in the art may make various forms under the teaching of the present invention without departing from the idea of the present invention and the protection scope of the appended claims. These forms shall fall into the protection scope of the present invention.