阅读说明：本技术 一种抗扭力连接件 (Torsion-resistant connecting piece ) 是由 陈华安 周苗 何存 于 2020-08-11 设计创作，主要内容包括：本发明公开了一种抗扭力连接件,包括框主体、设置于框主体的端头的连接部、以及设置于框主体内的多个弹力部；框主体包括相互平行的多个竖杆以及连接多个竖杆的横杆,弹力部设置于相邻两竖杆之间,并与其固定；弹力部包括弹性圈以及沿弹性圈径向设置的弹性杆,弹性圈的外周与竖杆固定,弹性杆包括恢复件、设置于恢复件的端头的抵接杆以及支撑杆,支撑杆与抵接杆固定连接,恢复件包括由外到内依次套接的第一壳体、第一弹簧体、第二壳体以及第二弹簧体。本发明适用于各种机器零部件、机构以及设备连接处,减弱扭力影响,能够对机器提供精准缓冲作用力,同时提供复位作用,延长机器使用寿命,并提高操作使用的平稳性、准确性。(The invention discloses an anti-torsion connecting piece which comprises a frame main body, a connecting part arranged at the end head of the frame main body and a plurality of elastic parts arranged in the frame main body, wherein the connecting part is arranged at the end head of the frame main body; the frame main body comprises a plurality of vertical rods which are parallel to each other and a cross rod which is connected with the vertical rods, and the elastic part is arranged between two adjacent vertical rods and is fixed with the vertical rods; elasticity portion includes elastic ring and follows the elastic rod of elastic ring radial setting, and elastic ring's periphery is fixed with the montant, and the elastic rod includes the recovery piece, sets up in butt pole and the bracing piece of the end of recovering the piece, bracing piece and butt pole fixed connection, and the recovery piece includes by outer first casing, first spring body, second casing and the second spring body that cup joints in proper order to interior. The invention is suitable for various machine parts, mechanisms and equipment joints, weakens the torsion influence, can provide accurate buffer acting force for the machine, simultaneously provides the reset action, prolongs the service life of the machine, and improves the stability and the accuracy of operation and use.)

1. An anti-torsion connecting piece is characterized by comprising a frame main body, a connecting part arranged at the end head of the frame main body and a plurality of elastic parts arranged in the frame main body;

the frame main body comprises a plurality of vertical rods which are parallel to each other and a cross rod which is connected with the vertical rods, and the elastic part is arranged between two adjacent vertical rods and is fixed with the vertical rods;

the elastic part comprises an elastic ring and an elastic rod radially arranged along the elastic ring, the periphery of the elastic ring is fixed with the vertical rod, the elastic rod comprises a restoring piece, a butt rod arranged at the end of the restoring piece and a supporting rod, the supporting rod is fixedly connected with the butt rod, the restoring piece comprises a first shell, a first spring body, a second shell and a second spring body which are sequentially sleeved from outside to inside, the first shell and the second shell are respectively provided with an open end and a closed end which are opposite, the closed end of the first shell is provided with an avoiding hole, the second shell penetrates through the avoiding hole to be sleeved with the first shell, the open end of the first shell is arranged opposite to the open end of the second shell, and the two ends of the first spring body are respectively abutted against the closed end and the corresponding butt rod of the first shell, and two ends of the second spring body are respectively abutted against the closed end of the second shell and the corresponding abutting rod.

2. The torsion resistant connector according to claim 1, wherein the connecting portion includes a main lever and a plurality of sub-levers connecting the main lever and the frame main body.

3. The torsion-resistant connecting member according to claim 1, wherein the frame body is a triangular prism, and the elastic portion is provided at a side surface of the frame body.

4. The torsion resistant connection of claim 1 wherein the spring constant of the first spring body and the spring constant of the second spring body are different.

5. The torsion resistant connection of claim 1 wherein the first spring body is selected from a first spring body group and the second spring body is selected from a second spring body group, the first spring body group and the second spring body group each comprising at least three springs of different spring constants.

6. The torsion-resistant connecting piece according to claim 1, wherein the inner wall of the elastic ring is provided with a sliding rail, and one end of the elastic rod is slidably connected with the sliding rail.

7. The torsion resistant connector in accordance with claim 1, wherein two of the elastic rods crossing in an x-shape are provided in the elastic ring.

8. The torsion resistant connection in accordance with claim 1, wherein an abutment ring is provided between one of the abutment rods and the first spring body, the abutment ring being movable in a gap formed by the first and second housings.

9. The torsion resistant connection in accordance with claim 1, wherein an abutment piece is provided between one of the abutment rods and the second spring body, the abutment piece being movable within the second housing.

10. The torsion resistant connector in accordance with claim 1, wherein the first housing and the second housing are integrally formed.

Technical Field

The invention relates to the technical field of mechanical connection, in particular to joints of various machine parts, mechanisms, equipment and the like, and particularly relates to an anti-torsion connecting piece.

Background

In various mechanical devices, two parts with relative motion often need to be limited to prevent damage, especially to the rotating parts, and conventionally, hard connection is adopted, so that although the relative motion is limited, the buffering effect is poor, and the joint between the two parts is easy to damage, so that a further solution is needed to solve the problem.

Disclosure of Invention

The invention aims to provide an anti-torsion connecting piece to overcome the defects in the prior art.

In order to solve the technical problems, the technical scheme of the invention is as follows:

an anti-torsion connecting piece comprises a frame main body, a connecting part arranged at the end head of the frame main body and a plurality of elastic parts arranged in the frame main body;

the frame main body comprises a plurality of vertical rods which are parallel to each other and a cross rod which is connected with the vertical rods, and the elastic part is arranged between two adjacent vertical rods and is fixed with the vertical rods;

the elastic part comprises an elastic ring and an elastic rod radially arranged along the elastic ring, the periphery of the elastic ring is fixed with the vertical rod, the elastic rod comprises a restoring piece, a butt rod arranged at the end of the restoring piece and a supporting rod, the supporting rod is fixedly connected with the butt rod, the restoring piece comprises a first shell, a first spring body, a second shell and a second spring body which are sequentially sleeved from outside to inside, the first shell and the second shell are respectively provided with an open end and a closed end which are opposite, the closed end of the first shell is provided with an avoiding hole, the second shell penetrates through the avoiding hole to be sleeved with the first shell, the open end of the first shell is arranged opposite to the open end of the second shell, and the two ends of the first spring body are respectively abutted against the closed end and the corresponding butt rod of the first shell, and two ends of the second spring body are respectively abutted against the closed end of the second shell and the corresponding abutting rod.

In a preferred embodiment of the present invention, the connecting portion includes a main lever and a plurality of branch levers connecting the main lever and the frame main body.

In a preferred embodiment of the present invention, the frame body is a triangular prism, and the elastic portion is disposed on a side surface of the frame body.

In a preferred embodiment of the invention, the spring constant of the first spring body is different from the spring constant of the second spring body.

In a preferred embodiment of the present invention, the first spring body is selected from a first spring body group, the second spring body is selected from a second spring body group, and the first spring body group and the second spring body group respectively comprise at least three springs with different elastic coefficients.

In a preferred embodiment of the present invention, the inner wall of the elastic ring is provided with a sliding rail, and one end of the elastic rod is slidably connected to the sliding rail.

In a preferred embodiment of the present invention, two elastic rods crossing in an x shape are disposed in the elastic ring.

In a preferred embodiment of the present invention, an abutting ring is disposed between the abutting rod and the first spring body, and the abutting ring is capable of moving in a gap formed by the first housing and the second housing.

In a preferred embodiment of the present invention, an abutting piece is disposed between the abutting rod and the second spring body, and the abutting piece is capable of moving in the second housing.

In a preferred embodiment of the present invention, the first housing and the second housing are integrally formed.

In a preferred embodiment of the present invention, the elastic ring is made of a metal material.

In a preferred embodiment of the present invention, the restoring member further comprises a first guide member disposed between an outer periphery of the abutment ring and an inner wall of the first housing, and/or between an inner periphery of the abutment ring and an outer wall of the second housing.

In a preferred embodiment of the present invention, the restoring member further includes a second guide member disposed between an outer circumference of the abutting piece and an inner wall of the second housing.

In a preferred embodiment of the present invention, the first guide assembly and the second guide assembly each include a guide block and a mating guide slot.

In a preferred embodiment of the present invention, a protective sleeve is disposed outside the restoring member, and the protective sleeve is sleeved on the supporting rod.

Compared with the prior art, the invention has the beneficial effects that:

(1) the invention is suitable for various machine parts, mechanisms and equipment joints, weakens the torsion influence, can provide accurate buffer acting force for the machine, simultaneously provides the reset action, prolongs the service life of the machine, and improves the stability and the accuracy of operation and use.

(2) The invention connects the external machine parts through the connecting part, realizes primary buffering through the frame main body, realizes secondary buffering through the elasticity of the elastic ring, realizes tertiary buffering through the restoring piece in the elastic rod, synergistically reduces the influence of external force through the tertiary buffering, prolongs the service life of the machine, and further improves the stability and the accuracy of operation and use.

(3) According to the invention, the slide rail on the inner side of the elastic ring is slidably connected with the elastic rod, so that the elastic rod can move in a certain range, the protection on the elastic rod is improved, and the service life of the torsion-resistant connecting piece is prolonged.

(4) According to the invention, the first spring body and the second spring body in the restoring piece realize synchronous buffering at two ends, so that the influence of external force is further reduced; furthermore, two modes of tiny buffering and large-amplitude buffering are provided through the difference of the elastic coefficients of the first spring body and the second spring body, and the situation of various acting forces can be met; still further, through first spring body group and second spring body group respectively including the spring of at least three different elastic coefficient, for the combination realization multiple buffer range of first spring body and second spring body, adapt to different operational environment.

(5) According to the invention, through the arrangement of the abutting ring and the abutting sheet, the contact area between the first spring body and the second spring body is increased, so that the first spring body or the second spring body can stably extend and retract, and the use stability of the recovery piece is improved.

(6) According to the invention, through the arrangement of the first guide assembly and the second guide assembly, the accuracy of the moving direction of the abutting ring or the abutting sheet is ensured, the friction between the abutting ring or the abutting sheet and the shell is reduced, and the moving fluency is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a perspective view of the present invention;

FIG. 2 is a perspective view of the frame body and the connecting portion of the present invention;

FIG. 3 is a perspective view of the elastic portion of the present invention;

FIG. 4 is an enlarged perspective view of a recovery member in accordance with an embodiment of the present invention;

FIG. 5 is an exploded view of the recovery member of FIG. 4;

figure 6 is an enlarged perspective view of a recovery member according to another embodiment of the present invention;

figure 7 is an exploded view of the recovery member of figure 6.

Specifically, 100-frame main body, 110-vertical rod, 120-horizontal rod,

200-connecting part, 210-main rod, 220-branch rod,

300-elastic part, 310-elastic ring, 311-sliding rail, 320-elastic rod, 321-restoring piece, 322-abutting rod, 323-supporting rod, 400-first shell, 401-open end, 402-closed end, 403-avoiding hole, 410-first spring body, 411-abutting ring, 412-guide block, 413-guide groove, 420-second shell, 430-second spring body and 431-abutting piece.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be taken as limiting the scope of the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art from the specific situation.

Figure 1 shows a perspective view of the present torsion resistant connector.

As shown in figure 1, the torsion-resistant connecting piece comprises a frame main body 100, a connecting part 200 arranged at the end of the frame main body 100 and a plurality of elastic parts 300 arranged in the frame main body 100, and is suitable for various machine parts, mechanisms and equipment joints, weakens torsion influence, can provide accurate buffering acting force for a machine, provides resetting effect, prolongs the service life of the machine, and improves stability and accuracy of operation and use.

Fig. 2 is a perspective view of the middle frame body 100 and the connecting portion 200 of the torsion-resistant connector.

Specifically, as shown in fig. 2, the frame body 100 includes a plurality of vertical bars 110 parallel to each other and a cross bar 120 connecting the plurality of vertical bars 110. At this time, the elastic portion 300 is disposed between and fixed to two adjacent vertical bars 110. In a preferred embodiment of the present invention, the frame body 100 is a triangular prism, and the elastic portion 300 is disposed on the side surface of the frame body 100, so that the frame body 100 with the triangular prism structure is more stable and is beneficial to resisting torsion. Of course, without being limited thereto, the frame body 100 may also be a quadrangular prism, a pentagonal prism, or the like. In this embodiment, the connection part 200 includes a main rod 210 and a plurality of branch rods 220 connecting the main rod 210 and the frame main body 100, and specifically, three branch rods 220 are respectively connected to one corner of the bottom surface of the frame main body 100 having the triangular prism structure and then fixed to the main rod 210, so that the acting force can be uniformly dispersed to the frame main body 100, and the machine part is connected to the main rod 210, and the connection may be hard-wired to improve the connection stability.

Fig. 3 shows a perspective view of the spring 300 of the torsion resistant connector.

As shown in fig. 3, the elastic part 300 includes an elastic ring 310 and an elastic rod 320 disposed along a radial direction of the elastic ring 310. Preferably, the elastic ring 310 is made of a metal material to have certain elasticity and strength at the same time. At this time, the elastic portion 300 is fixed to the stem 110 by the outer circumference of the elastic ring 310. The plurality of elastic rings 310 are preferably spaced apart or connected by springs to provide space for deformation of the single elastic ring 310 and reduce interference between the plurality of elastic rings 310. In this embodiment, two elastic rods 320 crossing in an x shape are used to achieve a better buffering and restoring effect. Of course, without being limited thereto, only one elastic rod 320 may be employed, and three, four, or more elastic rods 320 may also be employed.

Specifically, the elastic rod 320 includes a restoring member 321, an abutting rod 322 disposed at an end of the restoring member 321, and a supporting rod 323, wherein the supporting rod 323 is fixedly connected to the abutting rod 322, and is connected to the elastic ring 310 through the supporting rod 323, and the supporting rod 323 may be fixedly connected to the elastic ring 310 or movably connected thereto. In this embodiment, only two restoring members 321 are disposed in the elastic rod 320, but the present invention is not limited thereto, and only one restoring member 321 may be disposed, or three restoring members may be disposed, or more restoring members may be disposed, as required by those skilled in the art.

The invention connects the external machine parts through the connecting part 200, realizes primary buffering through the frame main body 100, realizes secondary buffering through the elasticity of the elastic ring 310, realizes tertiary buffering through the restoring piece 321 in the elastic rod 320, synergistically reduces the influence of external force through the tertiary buffering, prolongs the service life of the machine, and further improves the stability and the accuracy of operation and use.

Fig. 4 is an enlarged perspective view of the restoring member 321 according to an embodiment of the torsion resistant connector, and fig. 5 is an exploded perspective view of the restoring member 321 according to the embodiment.

The restoring member 321 includes a first housing 400, a first spring body 410, a second housing 420 and a second spring body 430, which are sequentially sleeved from outside to inside. Specifically, the first and second housings 400, 420 each have opposing open and closed ends 401, 402 to facilitate interference mounting of the first and second spring bodies 410, 430. Meanwhile, the closed end 402 of the first housing 400 has an escape hole 403, so that the second housing 420 can be sleeved with the first housing 400 through the escape hole 403. Open end 401 of first casing 400 sets up with open end 401 of second casing 420 mutually, at this moment, the periphery of open end 401 of second casing 420 is fixed with avoiding hole 403 of first casing 400, thereby make the both ends of first spring body 410 respectively with the blind end 402 of first casing 400, the butt pole 322 that corresponds offsets and leans on, the both ends of second spring body 430 respectively with the blind end 402 of second casing 420, the butt pole 322 that corresponds offsets and leans on, realize buffering from two directions through the elastic action of spring body and reset, promote the buffering effect that resets, the efficiency of resetting is improved.

In order to make the expansion and contraction buffering process smooth and prolong the service life of the restoring member 321, the axes of the restoring member 321, the abutting rod 322 and the supporting rod 323 preferably coincide with each other, that is, the axes of the restoring member 321, the abutting rod 322 and the supporting rod 323 coincide with each other to form a straight line.

In a preferred embodiment of the present invention, the spring constant of the first spring body 410 is different from the spring constant of the second spring body 430, thereby providing two modes of small damping and large damping, being capable of coping with various force levels, and controlling the damping force more precisely. Further, the first spring body 410 is selected from a first spring body group, the second spring body 430 is selected from a second spring body group, and the first spring body group and the second spring body group respectively comprise at least three springs with different elastic coefficients, so that various buffer ranges are realized for the combination of the first spring body 410 and the second spring body 430, and different working environments are adapted. Specifically, for example, the first spring group comprises 100N springs, 200N springs and 300N springs, and the second spring group comprises 25N springs, 50N springs and 75N springs, so that technicians can choose and adjust the springs according to field conditions, and the optimal buffering and resetting effects are combined.

In a preferred embodiment of the present invention, as shown in fig. 3, the inner wall of the elastic ring 310 is provided with a sliding rail 311, and one end of the elastic rod 320 is slidably connected to the sliding rail 311. Through the arrangement of the inner slide rail 311 of the elastic ring 310 and the sliding connection of the elastic rod 320, the elastic rod 320 can move within a certain range, so that the protection of the elastic rod 320 is improved, and the service life of the torsion-resistant connecting piece is prolonged. In this embodiment, the slide rail 311 is disposed in the elastic ring 310 and integrally formed therewith, and of course, the slide rail 311 may be additionally disposed in the elastic ring 310. Meanwhile, a locking device may be further disposed at one end of the elastic rod 320 slidably connected to the sliding rail 311, so that the elastic rod 320 is fixed at a certain position in the sliding rail 311 and cannot slide. The slide rail 311 is generally set to have a length such that the elastic rod 320 can swing by 20 to 50 degrees, thereby achieving a good protection effect, reducing the influence of external force, prolonging the service life of the machine, and further improving the stability and accuracy of operation and use.

Fig. 6 is an enlarged perspective view of a restoring member 321 in another embodiment of the torsion resistant connector; fig. 7 shows an exploded view of the restoring member 321 in the present embodiment; in this embodiment, the abutting rod 322 and the first spring body 410 and/or the second spring body 430 are abutted by a complicated structure, so as to improve the stability of the abutment.

In a preferred embodiment of the present invention, as shown in fig. 6 and 7, an abutting ring 411 is disposed between an abutting rod 322 and the first spring body 410, and the abutting ring 411 can move in a gap formed between the first casing 400 and the second casing 420 to increase a contact area between the abutting rod 322 and the first spring body 410, so that the first spring body 410 can be extended and retracted smoothly, and the stability of the restoring member 321 is improved. Further, the abutting rod 322 may be provided in plural in the direction, and arranged along the circumferential direction of the abutting ring 411, so as to achieve the uniform transmission of the acting force. Simultaneously, in order to improve a plurality of butt joint pole 322's overall stability, set up the connection piece at a plurality of butt joint pole 322's the other end for butt joint ring 411, a plurality of butt joint pole 322 and connection piece form a whole, improve the mobility stability.

Similarly, an abutting piece 431 may be disposed between an abutting rod 322 and the second spring body 430, and the abutting piece 431 may move in the second housing 420 to increase a contact area between the abutting rod 322 and the second spring body 430, so that the second spring body 430 is smoothly extended and retracted, and the stability of the restoring member 321 is improved. Further, only one abutting rod 322 in the direction may be provided, and the abutting rod 322 in the direction may be provided at a central position of the abutting piece 431, but is not limited thereto, and a plurality of abutting rods 322 in the direction may be provided.

In a preferred embodiment of the present invention, as shown in fig. 6 and 7, the restoring member 321 further includes a first guiding component disposed between the outer periphery of the abutting ring 411 and the inner wall of the first casing 400, and/or between the inner periphery of the abutting ring 411 and the outer wall of the second casing 420, so as to ensure the accuracy of the moving direction of the abutting ring 411, reduce the friction between the abutting ring 411 and the first casing 400 or the second casing 420, and improve the smoothness of the movement. Likewise, the restoring member 321 may further include a second guide assembly disposed between the outer circumference of the abutting piece 431 and the inner wall of the second housing 420 to ensure the accuracy of the moving direction of the abutting piece 431 and reduce friction between the abutting piece 431 and the second housing 420, thereby improving the smoothness of the movement.

Generally, the first and second guide assemblies each include a guide block 412 and a mating guide slot 413. In this embodiment, the guide block 412 is provided on the outer periphery of the abutment ring 411, a plurality of guide grooves 413 are provided on the inner wall of the first housing 400, and the guide block 412 is provided to ensure the accuracy of the moving direction of the abutment ring 411 by the guide of the guide block 412, and the guide block contacts the guide grooves, so that the radius of the abutment ring 411 is smaller than the inner radius of the first housing 400, thereby reducing the friction between the abutment ring 411 and the inner wall of the first housing 400, and enabling the abutment ring 411 to slide smoothly. To further improve the guiding effect and reduce friction, the inner circumference of the abutment ring 411 may also be provided with a plurality of guide blocks 412, in which case a plurality of corresponding guide grooves 413 are provided on the outer wall of the second housing, so that both the outer and inner circumferences of the abutment ring 411 can be guided and, by reducing the width of the abutment ring 411, the friction of the abutment ring 411 with the first and second housings 400, 420 can be reduced. On the other side, the guide block 412 is provided on the abutting piece 431 along the circumferential direction thereof, the guide groove 413 is provided on the inner wall of the second housing 420, the accuracy of the moving direction of the abutting piece 431 is ensured by the guide of the guide block 412, and the radius of the abutting piece 431 can be made smaller than the inner radius of the second housing 420 by the contact of the guide block 412 with the guide groove 413, thereby reducing the friction between the abutting piece 431 and the inner wall of the second housing 420, and enabling the abutting piece 431 to slide smoothly.

In a preferred embodiment of the present invention, the first casing 400 and the second casing 420 are integrally formed, so as to enhance the strength of the restoring member 321 and to make the connection between the first casing 400 and the second casing 420 more stable.

In a preferred embodiment of the present invention, a protective sleeve is disposed outside the restoring member 321, and the protective sleeve is sleeved on the supporting rod 323, so as to enhance the strength of the joint of the restoring member 321, the abutting rod 322 and the supporting rod 323, and prolong the service life. Further, a limiting device is disposed between the sheath and the supporting rod 323 to prevent the sheath from sliding off the restoring member 321.

In conclusion, the invention is suitable for various machine parts, mechanisms and equipment joints, reduces torsion influence, can provide precise buffering acting force for a machine, simultaneously provides a reset action, prolongs the service life of the machine, improves the stability and accuracy of operation and use, realizes primary buffering through the frame main body, realizes secondary buffering through the elasticity of the elastic ring, realizes tertiary buffering through the restoring piece in the elastic rod, synergistically reduces the influence of external force through the tertiary buffering, prolongs the service life of the machine, and further improves the stability and accuracy of operation and use.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should be able to make the description as a whole, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.