Auxiliary support device and cutting machine including the same

Abstract

The present invention discloses an auxiliary support device and a cutting machine including the same, wherein the auxiliary support device comprises: a support seat, on which a plurality of snap grooves are arranged; an auxiliary support member, which is hinged to the support seat; a snap member, one end of which is hinged to the auxiliary support member and switches with any snap groove to achieve the fixing or rotation of the auxiliary support member and the support seat; wherein a notch is arranged on the inner wall surface of each snap groove, and a first bevel surface is arranged at the end of the other end of the snap member, and the length of the notch along the depth direction of the snap groove is greater than the length of the first bevel surface. The auxiliary support member of this embodiment is hinged to the support seat, and the support surface can be adjusted by switching the snap member and the snap groove, and a notch for preventing disengagement is arranged on the inner wall surface of the snap groove, and a first bevel surface cooperating therewith is arranged on the snap member to prevent the snap member from disengaging from the snap groove when subjected to external force, thereby improving the reliability of the auxiliary support device.

Description

Technical Field

[0001] The invention relates to an auxiliary supporting device and a cutting machine comprising the same. Background Art

[0002] Usually, when a cutting machine is cutting materials, it is basically equipped with a support plate. In order to facilitate miniaturization, current cutting machines often design the support plate to be small. However, sometimes, in order to facilitate construction, it is also necessary to expand the support surface of the support plate for the workpiece to rest against during cutting. General cutting machines are not equipped with auxiliary support devices that can be used to expand the support surface, and some high-end cutting machines are equipped with auxiliary support devices for expanding the support surface. When it is needed, the auxiliary support device is opened to expand the support surface; when it is not needed, the auxiliary support device is retracted to reduce the size of the cutting machine. However, this auxiliary support device that can expand the support surface is not firmly fixed, and when it is subjected to a large support force, the support will fail. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the defect of poor supporting effect of the auxiliary supporting device for expanding the supporting surface in the prior art, and to provide an auxiliary supporting device and a cutting machine comprising the same.

[0004] The present invention solves the above technical problems through the following technical solutions:

[0005] An auxiliary supporting device, comprising:

[0006] A support base, wherein a plurality of buckle grooves are provided on the support base;

[0007] An auxiliary support member, the auxiliary support member having a hinged end, the hinged end being hinged to the support seat;

[0008] A buckle, one end of which is hinged to the auxiliary support and can be switched with any of the buckle slots to achieve fixation or rotation of the auxiliary support and the support seat;

[0009] Wherein, a notch is provided on the inner wall surface of each of the buckle grooves, a first bevel surface is provided at the end of the other end of the buckle member, and the length of the notch along the depth direction of the buckle groove is greater than the length of the first bevel surface;

[0010] When the other end of the buckle is locked in any one of the buckle slots and is in a locked state, and the auxiliary support member and the support seat rotate in a direction of approaching each other, the first bevel surface abuts against the notch.

[0011] In this solution, the auxiliary support member is hinged to the support seat, and the support surface of the support seat is expanded by the rotational dislocation of the support seat and the auxiliary support member. A notch for preventing slipping is provided on the inner wall surface of the buckle groove, and a first beveled surface cooperating therewith is provided on the buckle member. When the buckle member is clamped in the notch and is in a locked state, even if the auxiliary support member is subjected to a large external force, the notch and the first beveled surface cooperate to lock the buckle member in the buckle groove. The external force causes the buckle member to slide out of the slot. When the buckle member slides to the position where the first beveled surface cooperates with the notch, the direction of the reaction force applied by the notch to the buckle member just passes through the hinge axis of the buckle member. At this time, the torque of the reaction force of the notch is zero, and the buckle member is locked in the buckle groove and will not be separated from the buckle groove, thereby improving the reliability of the auxiliary support device. In other alternative embodiments, the buckle member can also be set on the support seat, and the buckle groove can be set on the auxiliary support member, and the two can be used in combination.

[0012] Preferably, the notch is located on the inner wall surface at a side away from the buckle member, and the notch is close to the outer side of the buckle groove in the depth direction.

[0013] In this solution, the direction in which the fastener is inserted into the fastener groove from the outside to the inside is the depth direction of the fastener groove, and the notch is set on the outside of the depth direction of the fastener groove. The fastener has a long sliding stroke through the notch, which is convenient for adjustment. At the same time, when the notch cooperates with the first bevel surface, it is ensured that there is a dead point at a certain point where the notch and the first bevel surface cooperate to lock the fastener.

[0014] Preferably, the length of the notch along the depth direction of the buckle groove is not greater than 1 / 2 of the depth of the buckle groove.

[0015] In this solution, the length of the notch is limited to prevent the notch from occupying too large a proportion of the buckle slot and affecting the strength of the buckle slot.

[0016] Preferably, the notch is in a V-shaped structure, a longer end of the V-shaped structure is connected to the outer side of the buckle groove, and the first beveled surface is located on the outer side of the contact surface between the buckle member and the buckle groove;

[0017] When the other end of the buckle is locked in any one of the buckle slots and is in a locked state, and the auxiliary support member and the support seat rotate in a direction close to each other, the first bevel surface abuts against the longer end of the V-shaped structure.

[0018] In this scheme, the V-shaped notch is set asymmetrically, with one end long and the other end short. The long end is set on the outside in the depth direction of the notch, so as to increase the sliding stroke of the first bevel surface at the long end. When a certain point on the long end cooperates with the first bevel surface, there is a dead point, which locks the fastener in the slot and improves the reliability of the auxiliary support device.

[0019] Preferably, the upper surface of the support seat is provided with a first protruding portion protruding upward, and the first protruding portion is an arc-shaped structure centered on the hinge axis of the hinge end, and a plurality of the snap grooves are arranged at intervals at the upper end of the first protruding portion, and the snap part is located on the outside of the arc-shaped structure.

[0020] In this solution, the snap groove is arranged on an arc-shaped structure of the support seat with the hinge axis as the center. The snap groove is on an arc with the same radius. When the auxiliary support rotates around the hinge axis, the snap part also rotates synchronously with the auxiliary support part. This ensures that the snap part can be accurately inserted into different snap grooves each time, thereby realizing the angle switching of the auxiliary support part.

[0021] Preferably, the auxiliary support member has a receiving cavity with an opening at the lower end, the buckle member and the buckle groove are located in the receiving cavity, and a first rib plate and a second rib plate protruding outward are provided on the top surface of the receiving cavity, the first rib plate and the second rib plate are located on a side of the hinge end away from the first protruding portion, and the first rib plate and the second rib plate are arranged in an eight-shaped shape;

[0022] When the auxiliary support member rotates relative to the support seat until the first rib abuts against one side of the first protrusion, the first protrusion prevents the auxiliary support member from continuing to rotate;

[0023] When the auxiliary support member rotates relative to the support seat until the second rib abuts against the other side of the first protrusion, the first protrusion prevents the auxiliary support member from continuing to rotate.

[0024] In this solution, the accommodating cavity of the auxiliary support member can cover other components, making the auxiliary support member and the support seat simple and beautiful in appearance. The first rib plate and the second rib plate cooperate with the first protrusion respectively, which can limit the auxiliary support member and the support seat to a certain rotation angle, thereby improving the reliability of the device.

[0025] Preferably, the buckle member comprises a buckle portion, a hinge portion and a force-applying portion which are connected in sequence, the hinge portion is hinged to the bottom surface of the auxiliary support member, and the buckle portion is connected to the buckle groove.

[0026] In this solution, the buckle is hinged to the auxiliary support, the buckle part is used to buckle the buckle slot, the hinge part is used to realize the rotation of the buckle, and the force-applying part is used to facilitate pressing the buckle. When the force-applying part is pressed, the buckle part is separated from the buckle slot, and the buckle and the buckle slot are unlocked, and the auxiliary support can switch the rotation angle within a certain angle range relative to the support seat; when the force-applying part is released, the buckle falls into the buckle slot, and the auxiliary support and the support seat are relatively fixed.

[0027] Preferably, the auxiliary support device also includes a torsion spring, which is sleeved on the hinge shaft of the hinge part, and the two ends of the torsion spring respectively abut against the bottom surface of the auxiliary support member and the buckle part, so as to apply a force to the buckle part along the direction close to the buckle groove.

[0028] In this solution, the torsion spring applies a force to the buckle member, pressing the buckle portion of the buckle member firmly into the buckle groove, thereby ensuring that the buckle member does not loosen or fall off.

[0029] Preferably, a second beveled surface is further provided on the outer peripheral surface of the buckle portion, the second beveled surface is adjacent to the first beveled surface, and the second beveled surface is close to the buckle groove.

[0030] In this solution, when the auxiliary support is subjected to external force and the buckle tends to rotate around its hinge axis, the second beveled surface can prevent the vertex of the buckle part from contacting the buckle groove, thereby increasing the contact area between the buckle and the buckle groove and improving the reliability of the device.

[0031] A cutting machine comprises a base, and the cutting machine also comprises the above-mentioned auxiliary supporting device, the base is the supporting seat, the number of the auxiliary supporting devices is two, and the two auxiliary supporting devices are respectively arranged at both ends of the base.

[0032] In this solution, two auxiliary support devices are installed at both ends of the cutting machine, so that the operator can expand the support surface of the base as needed during operation and increase the rotation angle of both ends of the cutting machine.

[0033] On the basis of being in accordance with the common sense in the art, the above-mentioned preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present invention.

[0034] The positive and progressive effects of the present invention are that the auxiliary support member of the present embodiment is hinged to the support seat, and the support surface can be adjusted by switching the buckle member and the buckle groove, thereby improving the use range of the auxiliary support device, and a notch for preventing disengagement is provided on the inner wall surface of the buckle groove, and a first beveled surface cooperating therewith is provided on the buckle member to prevent the buckle member from disengaging from the buckle groove when subjected to external force, thereby improving the reliability of the auxiliary support device. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 The figure is a schematic structural diagram of an auxiliary supporting device and a cutting machine including the same according to a preferred embodiment of the present invention.

[0036] Figure 2 The figure is a schematic structural diagram of an auxiliary supporting device and a cutting machine including the same according to a preferred embodiment of the present invention.

[0037] Figure 3 for Figure 1A schematic diagram of the enlarged structure of part A.

[0038] Figure 4 It is a schematic structural diagram of an auxiliary support member according to a preferred embodiment of the present invention.

[0039] Figure 5 It is a schematic structural diagram of a buckle according to a preferred embodiment of the present invention.

[0040] Figure 6 for Figure 5 The enlarged structural diagram of part B is shown in the figure.

[0041] Description of reference numerals:

[0042] Support seat 1

[0043] The first protrusion 11

[0044] Buckle slot 111

[0045] Gap1111

[0046] First hinge axis 110

[0047] Auxiliary support 2, hinge end 2a

[0048] Accommodating chamber 21

[0049] First rib plate 22

[0050] Second rib 23

[0051] The third rib 24

[0052] Fourth rib 25

[0053] Buckle 3, buckle portion 3a, hinge portion 3b, force application portion 3c

[0054] First bevel surface 31

[0055] Second bevel surface 32

[0056] Second hinge axis 30

[0057] Torsion spring 4

[0058] Unlocking piece 5 DETAILED DESCRIPTION

[0059] The present invention will be described more clearly and completely below by way of embodiments in conjunction with the accompanying drawings, but the present invention is not limited to the scope of the embodiments.

[0060] like Figure 1-Figure 6As shown, the present embodiment discloses an auxiliary support device, which includes: a support seat 1, on which a plurality of snap grooves 111 are arranged; an auxiliary support member 2, wherein the auxiliary support member 2 has a hinged end 2a, and the hinged end 2a is hinged to the support seat 1; a snap member 3, one end of which is hinged to the auxiliary support member 2 and can be switched with any snap groove 111 to achieve the fixation or rotation of the auxiliary support member 2 and the support seat 1; wherein a notch 1111 is arranged on the inner wall surface of each snap groove 111, and a first beveled surface 31 is arranged at the end of the other end of the snap member 3, and the length of the notch 1111 along the depth direction of the snap groove 111 is greater than the length of the first beveled surface 31; when the other end of the snap member 3 is inserted into any snap groove 111 and is in a locked state, and the auxiliary support member 2 and the support seat 1 rotate in a relatively close direction, the first beveled surface 31 abuts against the notch 1111.

[0061] In this embodiment, the support seat 1 and the auxiliary support member 2 are hinged together, and the support surface of the support seat 1 can be adjusted by rotating the support seat 1 and the auxiliary support member 2. A notch 1111 for preventing slipping is provided on the inner wall surface of the buckle groove 111, and a first beveled surface 31 cooperating therewith is provided on the buckle member 3. When the buckle member 3 is locked in the notch 1111 and is in a locked state, even if the auxiliary support member 2 is subjected to a large external force, the notch 1111 cooperates with the first beveled surface 31 to lock the buckle member 3 in the buckle groove 111. The external force causes the buckle 3 to slide outward from the buckle slot 111. When the buckle 3 slides to the position where the first bevel surface 31 and the notch 1111 match, the direction of the reaction force applied to the buckle 3 by the notch 1111 just passes through the second hinge axis 30. At this time, the moment of the reaction force of the notch 1111 is zero, and the buckle 3 is locked in the buckle slot 111 and will not be separated from the buckle slot 111, thereby improving the reliability of the auxiliary support device. In other alternative embodiments, the buckle 3 can also be set on the support seat 1, and the buckle slot 111 can be set on the auxiliary support 2, and the two can be used together.

[0062] The notch 1111 is located on the inner wall surface at a side away from the buckle member 3 , and the notch 1111 is close to the outer side of the buckle groove 111 in the depth direction.

[0063] In this embodiment, the direction in which the fastener 3 is inserted into the fastener groove 111 from the outside to the inside is the depth direction of the fastener groove 111, and the notch 1111 is set on the outside of the fastener groove 111 in the depth direction. The fastener 3 has a long stroke for sliding through the notch 1111, which is convenient for adjustment. At the same time, when the notch 1111 cooperates with the first beveled surface 31, it is ensured that there is a dead point at a certain point on the notch 1111 and the first beveled surface 31 to lock the fastener 3.

[0064] Preferably, the length of the notch 1111 along the depth direction of the buckle slot 111 is not greater than 1 / 2 of the depth of the buckle slot 111. Limiting the length of the notch 1111 prevents the notch 1111 from occupying too large a proportion of the buckle slot 111 and affecting the strength of the buckle slot 111.

[0065] On this basis, the notch 1111 is a V-shaped structure, the long end of the V-shaped structure is connected to the outside of the snap groove 111, and the first beveled surface 31 is located on the outside of the contact surface between the snap member 3 and the snap groove 111; when the other end of the snap member 3 is inserted into any snap groove 111 and is in a locked state, and the auxiliary support member 2 and the support seat 1 rotate in a relatively close direction, the first beveled surface 31 abuts against the long end of the V-shaped structure.

[0066] In this embodiment, the V-shaped notch 1111 is asymmetrically arranged, with one end being long and the other end being short. The long end is arranged on the outside in the depth direction of the notch 1111, so as to increase the sliding stroke of the first bevel surface 31 at the long end. When a certain point on the long end cooperates with the first bevel surface 31, there is a dead point, which locks the fastener 3 in the slot, thereby improving the reliability of the auxiliary support device.

[0067] A first protruding portion 11 protruding upward is provided on the upper surface of the support seat 1. The first protruding portion 11 is an arc-shaped structure centered on the first hinge axis 110. A plurality of snap grooves 111 are spaced apart at the upper end of the first protruding portion 11, and the snap member 3 is located on the outside of the arc-shaped structure.

[0068] In this embodiment, the snap groove 111 is arranged on an arc-shaped structure of the support base 1 with the first hinge axis 110 as the center. The snap groove 111 is on an arc with the same radius. When the auxiliary support member 2 rotates around the first hinge axis 110, the snap member 3 rotates synchronously with the auxiliary support member 2, thereby ensuring that the snap member 3 can be accurately inserted into different snap grooves 111 each time, thereby realizing the angle switching of the auxiliary support member 2.

[0069] The auxiliary support member 2 has a receiving cavity 21 with an opening at the lower end, the snap member 3 and the snap groove 111 are located in the receiving cavity 21, and a first rib plate 22 and a second rib plate 23 protruding outward are provided on the top surface of the receiving cavity 21, the first rib plate 22 and the second rib plate 23 are located on the side of the hinge end 2a away from the first protrusion 11, and the first rib plate 22 and the second rib plate 23 are arranged in an eight-shaped shape; when the auxiliary support member 2 rotates relative to the support seat 1 to the point where the first rib plate 22 abuts against one side of the first protrusion 11, the first protrusion 11 prevents the auxiliary support member 2 from continuing to rotate; when the auxiliary support member 2 rotates relative to the support seat 1 to the point where the second rib plate 23 abuts against the other side of the first protrusion 11, the first protrusion 11 prevents the auxiliary support member 2 from continuing to rotate.

[0070] In this embodiment, the receiving cavity 21 of the auxiliary support member 2 can cover other components, so that the appearance of the auxiliary support member 2 and the support seat 1 is simple and beautiful. The first rib plate 22 and the second rib plate 23 cooperate with the first protrusion 11 respectively, and the auxiliary support member 2 and the support seat 1 can be limited to a certain rotation angle, thereby improving the reliability of the device.

[0071] The buckle member 3 includes a buckle portion 3a, a hinge portion 3b and a force-applying portion 3c which are connected in sequence. The hinge portion 3b is hinged to the bottom surface of the auxiliary support member 2 , and the buckle portion 3a is connected to the buckle groove 111 .

[0072] In this embodiment, the buckle 3 is hinged to the auxiliary support 2, the buckle portion 3a is used to buckle the buckle slot 111, the hinge portion 3b is used to realize the rotation of the buckle 3, and the force-applying portion 3c is used to facilitate pressing the buckle 3. When the force-applying portion 3c is pressed, the buckle portion 3a is disengaged from the buckle slot 111, and the buckle 3 and the buckle slot 111 are unlocked, and the auxiliary support 2 can switch the rotation angle within a certain angle range relative to the support seat 1; when the force-applying portion 3c is released, the buckle 3 falls into the buckle slot 111, and the auxiliary support 2 and the support seat 1 are relatively fixed.

[0073] The auxiliary support device also includes a torsion spring 4, which is sleeved on the second hinge shaft 30, and the two ends of the torsion spring 4 respectively abut against the bottom surface of the auxiliary support member 2 and the buckle portion 3a, so as to apply a force to the buckle portion 3a along the direction close to the buckle groove 111.

[0074] In this embodiment, the torsion spring 4 applies a force to the buckle member 3 to firmly press the buckle portion 3 a of the buckle member 3 into the buckle groove 111 , thereby ensuring that the buckle member 3 does not loosen or fall off.

[0075] A second beveled surface 32 is also provided on the outer circumferential surface of the buckle portion 3a, the second beveled surface 32 is adjacent to the first beveled surface 31, and the second beveled surface 32 is close to the buckle groove 111. When the auxiliary support member 2 is subjected to an external force and the buckle member 3 has a tendency to rotate around the second hinge axis 30, the vertex of the buckle portion 3a is prevented from contacting the buckle groove 111, the contact surface between the buckle member 3 and the buckle groove 111 is increased, and the reliability of the device is improved.

[0076] The auxiliary support member 2 has a receiving cavity 21 with an opening at the lower end, the fastener 3 and the fastener groove 111 are located in the receiving cavity 21, and a third rib 24 and a fourth rib 25 protruding outward are also provided on the top surface of the receiving cavity 21. The third rib 24 is located at the hinge between the fastener 3 and the auxiliary support member 2, one end of the torsion spring 4 abuts against the third rib 24, and the fourth rib 25 is intersecting with the fastener 3 and located above it, and the upper surface of the fastener 3 abuts against the lower surface of the fourth rib 25.

[0077] The third rib 24 is used to fix one end of the spring, and the fourth rib 25 is used to limit the movement of the buckle 3 within a certain range to prevent the buckle 3 from tilting and the buckle portion 3a from failing to smoothly fit into the buckle groove 111, thereby improving the reliability of the device.

[0078] The auxiliary support device also includes an unlocking member 5, one end of which is hinged to the force-applying portion 3c, and the other end of which extends out of the end surface of the auxiliary support member 2. The operator can unlock the buckle member 3 on the end surface of the auxiliary support member 2 by pressing the unlocking member 5, which is easy to operate.

[0079] A cutting machine includes a base and the above-mentioned auxiliary supporting device. The base is the supporting seat 1 of this embodiment. There are two auxiliary supporting devices, which are respectively arranged at both ends of the base.

[0080] In this embodiment, two auxiliary support devices are installed at both ends of the cutting machine, so that the operator can expand the support surface of the base as needed during operation and increase the rotation angle of the two ends of the cutting machine.

[0081] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. An auxiliary support device, characterized in that: The auxiliary supporting device comprises: A support base, wherein a plurality of buckle grooves are provided on the support base; An auxiliary support member, the auxiliary support member having a hinged end, the hinged end being hinged to the support seat; A buckle, one end of which is hinged to the auxiliary support and can be switched with any of the buckle slots to achieve fixation or rotation of the auxiliary support and the support seat; Wherein, a notch is provided on the inner wall surface of each of the buckle grooves, a first bevel surface is provided at the end of the other end of the buckle member, and the length of the notch along the depth direction of the buckle groove is greater than the length of the first bevel surface; When the other end of the buckle is locked in any one of the buckle slots and is in a locked state, and the auxiliary support member and the support seat rotate in a direction of approaching each other, the first bevel surface abuts against the notch.

2. An auxiliary support device according to claim 1, characterized in that: The notch is located on the inner wall surface at a side away from the buckle member, and the notch is close to the outer side of the buckle groove in the depth direction.

3. An auxiliary support device according to claim 2, characterized in that: The length of the notch along the depth direction of the buckle groove is no greater than 1 / 2 of the depth of the buckle groove.

4. An auxiliary support device as claimed in claim 2, characterized in that: The notch is in a V-shaped structure, a longer end of the V-shaped structure is connected to the outer side of the buckle groove, and the first bevel surface is located on the outer side of the contact surface between the buckle member and the buckle groove; When the other end of the buckle is locked in any one of the buckle slots and is in a locked state, and the auxiliary support member and the support seat rotate in a direction close to each other, the first bevel surface abuts against the longer end of the V-shaped structure.

5. An auxiliary support device according to claim 1, characterized in that: The upper surface of the support seat is provided with a first protruding portion protruding upward, and the first protruding portion is an arc-shaped structure centered on the hinge axis of the hinge end. A plurality of snap grooves are arranged at intervals at the upper end of the first protruding portion, and the snap member is located on the outside of the arc-shaped structure.

6. An auxiliary support device as claimed in claim 5, characterized in that: The auxiliary support member has a receiving cavity with an opening at the lower end, the buckle member and the buckle groove are located in the receiving cavity, and a first rib plate and a second rib plate protruding outward are provided on the top surface of the receiving cavity, the first rib plate and the second rib plate are located on a side of the hinge end away from the first protruding portion, and the first rib plate and the second rib plate are arranged in an eight-shaped shape; When the auxiliary support member rotates relative to the support seat until the first rib abuts against one side of the first protrusion, the first protrusion prevents the auxiliary support member from continuing to rotate; When the auxiliary support member rotates relative to the support seat until the second rib abuts against the other side of the first protrusion, the first protrusion prevents the auxiliary support member from continuing to rotate.

7. An auxiliary support device according to claim 1, characterized in that: The buckle member comprises a buckle portion, a hinge portion and a force-applying portion which are connected in sequence, the hinge portion is hinged to the bottom surface of the auxiliary support member, and the buckle portion is connected to the buckle groove.

8. An auxiliary support device according to claim 7, characterized in that: The auxiliary support device also includes a torsion spring, which is sleeved on the hinge shaft of the hinge part. The two ends of the torsion spring respectively abut against the bottom surface of the auxiliary support member and the buckle part to apply a force to the buckle part in a direction close to the buckle groove.

9. An auxiliary support device according to claim 7, characterized in that: A second beveled surface is also provided on the outer peripheral surface of the buckle portion, the second beveled surface is adjacent to the first beveled surface, and the second beveled surface is close to the buckle groove.

10. A cutting machine, comprising a base, characterized in that: The cutting machine also includes an auxiliary supporting device as described in any one of claims 1 to 9, the base is the supporting seat, the number of the auxiliary supporting devices is two, and the two auxiliary supporting devices are respectively arranged at both ends of the base.

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