A mobile driving machine applicable to multiple scenarios

Abstract

The present invention discloses a mobile driving machine applicable to multiple scenarios, including a support base, a fuel tank seat and an armrest. An outer wall of the support base is fixedly provided with the fuel tank seat, and the armrest is arranged on a side of the fuel tank seat. The mobile driving machine further includes: a delivery pump installed on a top of the fuel tank seat, a hydraulic pressure gauge installed on a top of the delivery pump, a connecting pipe connected to a side of the delivery pump, a jacking oil cylinder arranged at an end of the connecting pipe, and a supporting seat arranged at an end of the jacking oil cylinder. For the mobile driving machine applicable to multiple scenarios, a first spring arranged on a side of a docking block is utilized to support positions of the docking block and a runner, so that the runner on a side of a docking seat can rotate normally. When the jacking oil cylinder jacks up an object, the runner drives the docking block to move and compresses the first spring, enabling the docking seat to contact the ground, realizing stable support for the object, and enabling the runner not to be reversed during jacking, avoiding a situation that the runner is damaged due to excessive force.

Description

Technical Field

[0001] The present invention relates to the technical field of driving machines, and particularly to a mobile driving machine applicable to multiple scenarios. Background Art

[0002] Mobile driving machines can be roughly classified into hydraulic mobile driving machines, electro-hydraulic machines, and starting hydraulic machines from types. Mobile driving machines need to have a strong and heavy-duty resistant structure, which can enable the driving machine to have a longer service life. During the daily maintenance of large vehicles, especially during the maintenance of flatbed transport trains, it is often necessary to temporarily lift the maintenance vehicle on the spot, and thus a mobile driving machine is required.

[0003] Currently, the jacking mechanism of the driving machine is relatively fixed, and the distance between the jacking mechanism and the pushing handrail frame is relatively small. When it is necessary to jack the vehicle at a deeper position, it is very easy for the pushing handrail frame to collide with the car frame, resulting in the situation that the jacking position cannot be reached, bringing certain limitations to the use.

[0004] In view of the existing problems, it is urgent to innovate on the basis of the original mobile driving machine. Summary of the Invention

[0005] The purpose of the present invention is to provide a mobile driving machine applicable to multiple scenarios, so as to solve the problems in the above background art that the jacking mechanism of the current driving machine is relatively fixed, and the distance between the jacking mechanism and the pushing handrail frame is relatively small. When it is necessary to jack the vehicle at a deeper position, it is very easy for the pushing handrail frame to collide with the car frame, resulting in the situation that the jacking position cannot be reached, bringing certain limitations to the use.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A mobile driving machine applicable to multiple scenarios, including a support base, a fuel tank seat, and a handrail. The outer wall of the support base is fixedly installed with a fuel tank seat, and a handrail is arranged on the side of the fuel tank seat;

[0007] It further includes:

[0008] A transfer pump, installed on the top of the fuel tank seat, and a hydraulic pressure gauge is installed on the top of the transfer pump. A connecting pipe is connected to the side of the transfer pump. The end of the connecting pipe is provided with a jacking oil cylinder, and the end of the jacking oil cylinder is provided with a supporting seat;

[0009] A first motor, installed on the side of the support base, and a connecting lead screw is arranged at the output end of the first motor. A docking seat is threadedly connected to the outside of the connecting lead screw. At the same time, a limiting column is arranged on the side of the connecting lead screw;

[0010] A second motor is disposed inside the docking seat. The output end of the second motor is fixedly connected to a rotating disk. A ball is disposed at the bottom of the rotating disk. A fixing seat is disposed outside the ball.

[0011] A limiting mechanism is installed on both sides of the fixing seat.

[0012] As an alternative solution of the multi - applicable - scenario mobile driving machine of the present invention, wherein: the limiting posts are nested inside the docking seat. There are two limiting posts symmetrically arranged. The limiting posts are welded to the support base.

[0013] As an alternative solution of the multi - applicable - scenario mobile driving machine of the present invention, wherein: the outer surface of the ball is in mutual contact with the outer surface of the rotating disk. The balls are arranged at equal angles with respect to the center of the fixing seat in a top - view. The diameter of the rotating disk is larger than the diameter of the fixing seat.

[0014] As an alternative solution of the multi - applicable - scenario mobile driving machine of the present invention, wherein the limiting mechanism includes a movable seat, a limiting piece, a frosted piece, a connecting block and a first airbag. A limiting piece is fixedly connected to the side of the movable seat. A frosted piece is disposed on the side of the limiting piece. Both the limiting piece and the frosted piece are symmetrically arranged with respect to the central axis of the rotating disk. A mounting seat is disposed on the side of the limiting mechanism.

[0015] As an alternative solution of the multi - applicable - scenario mobile driving machine of the present invention, wherein: a connecting block is disposed at the bottom of the movable seat. The connecting block is slidably connected to the docking seat. A first airbag is disposed on the side of the connecting block.

[0016] As an alternative solution of the multi - applicable - scenario mobile driving machine of the present invention, wherein: a second airbag is disposed inside the mounting seat. A communicating pipe is disposed on the side of the second airbag. The second airbag is in mutual communication with the first airbag through the communicating pipe.

[0017] As an alternative solution of the multi - applicable - scenario mobile driving machine of the present invention, wherein: a docking block is in fitting connection with the bottom of the second airbag. A rotating wheel is disposed on the side of the docking block. A traction wire is disposed at the bottom of the docking block. A movable rod is fixedly connected to the outer wall of the docking block.

[0018] As an alternative solution of the multi - applicable - scenario mobile driving machine of the present invention, wherein: the end of the traction wire is connected to a sliding block. A third spring is fixedly connected to the outer wall of the sliding block. A supporting plate is disposed at the bottom of the sliding block.

[0019] As an alternative solution of the mobile driving machine for multiple applicable scenarios of the present invention, wherein: a first spring is nested outside the movable rod, a sealing mechanism is arranged at the end of the movable rod, and a connecting shell is attached to the outside of the sealing mechanism.

[0020] As an alternative solution of the mobile driving machine for multiple applicable scenarios of the present invention, wherein: the sealing mechanism includes a connecting disc, a connecting through hole, a connecting groove, a sealing disc, a positioning rod and a second spring. A connecting through hole is formed inside the connecting disc, and a connecting groove is arranged on the side of the connecting through hole. The inner wall of the connecting disc is attached to the sealing disc, a positioning rod is fixedly connected to the outer wall of the sealing disc, a second spring is nested outside the positioning rod, and the connecting through holes are arranged at equal angles.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. The mobile driving machine for multiple applicable scenarios is provided with a connecting lead screw. By controlling the rotation of the connecting lead screw, the connecting lead screw drives the docking seat to slide on the limit post, and the limit post is used to limit the movement of the docking seat and the lifting oil cylinder. Moreover, by rotating the rotating disc, the supporting position of the supporting seat on the lifting oil cylinder can be adjusted, so as to facilitate adjusting the lifting position of the lifting oil cylinder according to actual needs and improve its applicability in various scenarios;

[0023] 2. The mobile driving machine for multiple applicable scenarios is provided with a first spring. The first spring arranged on the side of the docking block is used to support the positions of the docking block and the rotating wheel, so that the rotating wheel on the side of the docking seat can rotate normally. When the lifting oil cylinder jacks up an object, the rotating wheel will drive the docking block to move and compress the first spring, so that the docking seat contacts the ground, realizing stable support for the object, and enabling the rotating wheel not to be reversed during jacking, avoiding the situation of damage to the rotating wheel due to excessive force;

[0024] 3. The mobile driving machine for multiple applicable scenarios is provided with a traction wire. When the docking block moves upward, it will pull the traction wire, and the traction wire will drive the sliding block and the supporting plate inside the docking block to move. And there are two supporting plates, which slide to both sides at the same time. When the docking seat contacts the ground, the supporting plate moves to the maximum position and contacts the ground to increase the contact surface with the ground, so as to further improve the support stability. Moreover, when the sliding block moves, it will compress the third spring. When the supporting plate is not pulled by the traction wire, the reset elastic force of the third spring will drive the supporting plate to reset, realizing the effect of automatic contraction;

[0025] 4. The multi-scenario mobile driving machine is provided with a first airbag. When the docking block moves upward, it will simultaneously compress the second airbag, allowing the gas in the second airbag to enter the first airbag through the connecting pipe, and causing the first airbag to expand. The first airbag drives the connecting block and the movable seat to move, thereby driving the two limit pieces to move towards the rotating disk, and the abrasive sheets on the limit pieces squeeze and lock the rotating disk, preventing the rotating disk from rotating when the jacking cylinder on the rotating disk jacks up an object, and maintaining the stability of the object during jacking. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a three-dimensional structural schematic diagram of the present invention;

[0027] Figure 2 is a sectional structural schematic diagram of the docking seat and the rotating wheel of the present invention;

[0028] Figure 3 is a structural schematic diagram of the connection between the connecting screw rod and the docking seat of the present invention;

[0029] Figure 4 is a sectional structural schematic diagram of the mounting seat of the present invention;

[0030] Figure 5 of the present invention Figure 4 is an enlarged structural schematic diagram at A in;

[0031] Figure 6 is a structural schematic diagram of the connection between the ball and the fixed seat of the present invention;

[0032] Figure 7 is a sectional structural schematic diagram of the limiting mechanism of the present invention;

[0033] Figure 8 of the present invention Figure 7 is an enlarged structural schematic diagram at B in.

[0034] In the figure: 1. Support base; 2. Fuel tank seat; 3. Armrest; 4. Delivery pump; 5. Hydraulic pressure gauge; 6. Connecting pipe; 7. Jacking oil cylinder; 8. Supporting seat; 9. First motor; 10. Connecting screw rod; 11. Limit column; 12. Docking seat; 13. Second motor; 14. Rotating disk; 15. Ball; 16. Fixed seat; 17. Limiting mechanism; 171. Movable seat; 172. Limit piece; 173. Abrasive sheet; 174. Connecting block; 175. First airbag; 18. Mounting seat; 19. Second airbag; 20. Connecting pipe; 21. Docking block; 22. Rotating wheel; 23. Tensile wire; 24. Movable rod; 25. First spring; 26. Connecting housing; 27. Sealing mechanism; 271. Connecting disk; 272. Connecting through hole; 273. Connecting groove; 274. Sealing disk; 275. Positioning rod; 276. Second spring; 28. Sliding block; 29. Third spring; 30. Supporting plate. Detailed implementation manners

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0036] Embodiment 1

[0037] The purpose of this embodiment is to facilitate the solution of the problem of how to improve the applicable scenarios of a mobile driving machine. Please refer to Figures 1 to 3 , Figure 6 and Figure 7 , the present invention provides a technical solution: a mobile driving machine with multiple applicable scenarios, including a support base 1, a fuel tank seat 2, and an armrest 3. The outer wall of the support base 1 is fixedly installed with the fuel tank seat 2, and an armrest 3 is arranged on the side of the fuel tank seat 2;

[0038] It further includes:

[0039] A transfer pump 4, installed on the top of the fuel tank seat 2, and a hydraulic pressure gauge 5 is installed on the top of the transfer pump 4. A connecting pipe 6 is connected to the side of the transfer pump 4. The end of the connecting pipe 6 is provided with a jacking oil cylinder 7, and the end of the jacking oil cylinder 7 is provided with a supporting seat 8;

[0040] A first motor 9, installed on the side of the support base 1, and a connecting lead screw 10 is arranged at the output end of the first motor 9. A docking seat 12 is threadedly connected to the outside of the connecting lead screw 10. At the same time, a limiting column 11 is arranged on the side of the connecting lead screw 10;

[0041] A second motor 13, arranged inside the docking seat 12, and a rotating disk 14 is fixedly connected to the output end of the second motor 13. A ball 15 is arranged at the bottom of the rotating disk 14. At the same time, a fixing seat 16 is arranged outside the ball 15;

[0042] A limiting mechanism 17, installed on both sides of the fixing seat 16;

[0043] The limiting column 11 is nested inside the docking seat 12, and there are two symmetrically arranged limiting columns 11. The limiting column 11 is welded to the support base 1. The outer surface of the ball 15 is in mutual contact with the outer surface of the rotating disk 14. The balls 15 are arranged at equal angles with respect to the center of the fixing seat 16 in a top view, and the diameter of the rotating disk 14 is larger than the diameter of the fixing seat 16;

[0044] First, by pushing the armrest 3 on the fuel tank seat 2, the rotating wheels 22 on the support base 1 and the docking seat 12 are driven to rotate, facilitating the pushing of the lifting oil cylinder 7 to a suitable lifting position. Moreover, the rotation of the first motor 9 can be controlled. The first motor 9 drives the connecting lead screw 10 to rotate within the docking seat 12. When the connecting lead screw 10 rotates, it drives the docking seat 12 to rotate on the limit posts 11. And there are two limit posts 11 to limit the sliding of the docking seat 12, realizing the adjustment of the distance between the docking seat 12 and the support base 1, and further adjusting the lifting position of the lifting oil cylinder 7 on the docking seat 12, facilitating the adjustment of a suitable lifting position according to requirements and improving the applicable scenarios of the mobile vehicle lifter.

[0045] Before lifting, the rotation of the second motor 13 can be controlled. The second motor 13 drives the rotating disk 14 and the lifting oil cylinder 7 to rotate, adjusting the supporting position of the supporting seat 8 on the lifting oil cylinder 7, further improving the applicability of the mobile vehicle lifter. Moreover, balls 15 are provided at the bottom of the rotating disk 14, and the balls 15 are embedded in the fixed seat 16, using the balls 15 to achieve the effect of auxiliary support.

[0046] Embodiment 2

[0047] This embodiment aims to promote the solution of the problem of how to make the rotating wheel 22 not subject to the lifting pressure when lifting an object while improving the lifting stability. This embodiment is an improvement based on Embodiment 1. Specifically, please refer to Figure 2 、 Figure 4 and Figure 7 Inside the mounting seat 18, a second airbag 19 is provided. And at the side of the second airbag 19, a connecting pipe 20 is provided. And the second airbag 19 is interconnected with the first airbag 175 through the connecting pipe 20. The bottom of the second airbag 19 is in fit connection with a docking block 21. And at the side of the docking block 21, a rotating wheel 22 is provided. And at the bottom of the docking block 21, a towing wire 23 is provided. At the same time, a movable rod 24 is fixedly connected to the outer wall of the docking block 21. The end of the towing wire 23 is connected to a sliding block 28. And a third spring 29 is fixedly connected to the outer wall of the sliding block 28. And at the bottom of the sliding block 28, a supporting plate 30 is provided. A first spring 25 is nested outside the movable rod 24. And at the end of the movable rod 24, a blocking mechanism 27 is provided. And a connecting housing 26 is in fit connection with the outside of the blocking mechanism 27.

[0048] Using the supporting effect provided by the first spring 25 provided on the docking block 21 to limit the positions of the docking block 21 and the rotating wheel 22. When the lifting oil cylinder 7 is not stressed and the docking block 21 and the rotating wheel 22 are in rotational connection, the rotating wheel 22 can support the docking seat 12 while rotating. When the delivery pump 4 operates to allow the oil fluid in the fuel tank seat 2 to enter the lifting oil cylinder 7 through the connecting pipe 6, the supporting seat 8 moves upward accordingly to lift an object.

[0049] During the jacking process, the runner 22 drives the docking block 21 to move, drives the movable rod 24 to move within the connecting housing 26, squeezes the first spring 25, causes the runner 22 to move upward. During the upward movement of the runner 22, finally makes the support base 1 and the docking seat 12 contact the ground, to improve its stable support effect, and makes the runner 22 not subject to the support pressure, avoiding the situation that the runner 22 is damaged due to excessive support pressure;

[0050] When the docking block 21 moves upward, the docking block 21 will simultaneously pull the traction wire 23. The end of the traction wire 23 is connected with a sliding block 28, driving the sliding block 28 and the supporting plate 30 to slide within the docking seat 12. When the sliding block 28 moves, it will compress the third spring 29, and there are two supporting plates 30. When the docking seat 12 contacts the ground, the supporting plate 30 moves to the maximum position and contacts the ground, to increase the contact surface with the ground and further improve its support stability. And when the supporting plate 30 is not subject to the pulling force of the traction wire 23, the restoring elastic force of the third spring 29 will drive the supporting plate 30 to reset, making the supporting plate 30 automatically retract into the docking seat 12, reducing the space occupied during placement.

[0051] Embodiment 3

[0052] This embodiment aims to facilitate the solution of the problem of how to reduce the jitter between the docking seat 12 and the runner 22 when the mobile driving machine moves. This embodiment is an improvement based on Embodiment 1. Specifically, please refer to Figure 2 、 Figure 4 and Figure 5 . The blocking mechanism 27 includes a connecting disk 271, a connecting through hole 272, a connecting groove 273, a blocking disk 274, a positioning rod 275 and a second spring 276. The inside of the connecting disk 271 is provided with a connecting through hole 272, and a connecting groove 273 is arranged on the side of the connecting through hole 272. The inner wall of the connecting disk 271 is fitted with a blocking disk 274, the outer wall of the blocking disk 274 is fixedly connected with a positioning rod 275, and a second spring 276 is nested outside the positioning rod 275. At the same time, the connecting through holes 272 are arranged at equal angles;

[0053] Using the plugging mechanism 27 provided at the top of the movable rod 24, when the movable rod 24 moves, it will drive the connecting disk 271 to slide within the connecting housing 26. There is damping hydraulic fluid within the connecting housing 26, enabling the plugging disk 274 on one side of the connecting disk 271 to drive the positioning rod 275 to move and compress the second spring 276. When the plugging disk 274 moves to the connecting groove 273, the connecting channel on the connecting disk 271 will be opened, allowing the damping hydraulic fluid to flow through the connecting through-hole 272 to the other end of the connecting disk 271. Moreover, there are two structures on the plugging disk 274, arranged in opposite directions. When the connecting disk 271 moves, one channel is opened and the other channel is closed, increasing the resistance when the movable rod 24 drives the plugging mechanism 27 to move. Thus, when the movable rod 24 drives the first spring 25 to expand and contract, the jitter during the movement of the first spring 25 is reduced, making the movement of the lifting oil cylinder 7 driven by the runner 22 more stable.

[0054] Embodiment 4

[0055] This embodiment aims to facilitate the solution to the problem of how to avoid the rotation of the lifted object during the lifting process. This embodiment is an improvement based on Embodiment 1. Specifically, please refer to Figure 2 、 Figure 7 and Figure 8 . The limiting mechanism 17 includes a movable seat 171, a limiting piece 172, a frosted piece 173, a connecting block 174, and a first airbag 175. The side of the movable seat 171 is fixedly connected to the limiting piece 172, and a frosted piece 173 is arranged on the side of the limiting piece 172. At the same time, both the limiting piece 172 and the frosted piece 173 are symmetrically arranged about the central axis of the rotating disk 14. An installation seat 18 is arranged on the side of the limiting mechanism 17. A connecting block 174 is arranged at the bottom of the movable seat 171, and the connecting block 174 is in sliding connection with the docking seat 12. A first airbag 175 is arranged on the side of the connecting block 174;

[0056] When the docking block 21 slides upward, it will simultaneously squeeze the second airbag 19 in the mounting seat 18. The second airbag 19 is connected to the first airbag 175 through the connecting pipe 20. When the second airbag 19 is squeezed, the gas in the second airbag 19 will enter the first airbag 175 through the connecting pipe 20, causing the first airbag 175 to expand. When the first airbag 175 expands, it will drive the connecting block 174 and the movable seat 171 to slide on the docking seat 12. The movable seat 171 is provided with a limiting piece 172 and a frosted piece 173. The movement of the connecting block 174 is used to drive the limiting piece 172 and the frosted piece 173 to move. There are two limiting pieces 172 and frosted pieces 173, which are located on both sides of the rotating disk 14. As the first airbag 175 expands, the frosted piece 173 on the limiting piece 172 will finally come into contact with the rotating disk 14. The frosted piece 173 is used to increase the friction during contact, squeeze the rotating disk 14, and limit the rotation of the rotating disk surface 14 to avoid the situation where the rotating disk 14 drives the jacking oil cylinder 7 to rotate accidentally during the jacking process.

[0057] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0058] The content not described in detail in this specification belongs to the prior art well known to those skilled in the art.

[0059] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A mobile driving machine applicable to multiple scenarios, comprising a support base, a fuel tank seat and an armrest. The outer wall of the support base is fixedly installed with a fuel tank seat, and an armrest is arranged on the side of the fuel tank seat; It is characterized in that It further includes: A delivery pump installed on the top of the fuel tank seat, with a hydraulic gauge installed on the top of the delivery pump. A connecting pipe is connected to the side of the delivery pump, and a jacking cylinder is arranged at the end of the connecting pipe, and a supporting seat is arranged at the end of the jacking cylinder; A first motor installed on the side of the support base, with a connecting lead screw arranged at the output end of the first motor. A docking seat is threadedly connected to the outside of the connecting lead screw, and a limiting column is arranged on the side of the connecting lead screw; A second motor arranged inside the docking seat, with a rotating disk fixedly connected to the output end of the second motor. There are balls arranged at the bottom of the rotating disk, and a fixed seat is arranged outside the balls; A limiting mechanism is installed on both sides of the fixed seat. The limiting mechanism includes a movable seat, a limiting piece, a grinding piece, a connecting block and a first airbag. A limiting piece is fixedly connected to the side of the movable seat, and a grinding piece is arranged on the side of the limiting piece. An installation seat is arranged on the side of the limiting mechanism. A connecting block is arranged at the bottom of the movable seat, and a first airbag is arranged on the side of the connecting block. A second airbag is arranged inside the installation seat, and a communicating pipe is arranged on the side of the second airbag, and the second airbag is communicated with the first airbag through the communicating pipe; The bottom of the second airbag is adhesively connected with a docking block, and a rotating wheel is arranged on the side of the docking block. A traction wire is arranged at the bottom of the docking block, and a movable rod is fixedly connected to the outer wall of the docking block; A first spring is nested outside the movable rod, and a plugging mechanism is arranged at the end of the movable rod, and the outside of the plugging mechanism is adhesively connected with a connecting shell; The plugging mechanism includes a connecting disk, a connecting through hole, a connecting groove, a plugging disk, a positioning rod and a second spring. A connecting through hole is opened inside the connecting disk, and a connecting groove is arranged on the side of the connecting through hole. A plugging disk is adhesively connected to the inner wall of the connecting disk, and a positioning rod is fixedly connected to the outer wall of the plugging disk, and a second spring is nested outside the positioning rod.

2. The mobile driving machine applicable to multiple scenarios according to claim 1, wherein: The limiting column is nested inside the docking seat, and there are two limiting columns arranged symmetrically, and the limiting column is welded to the support base.

3. The mobile driving machine applicable to multiple scenarios according to claim 1 is characterized in that: The outer surface of the ball is mutually attached to the outer surface of the rotating disk, and the balls are arranged at equal angles with respect to the center of the fixed seat in a top view, and the diameter of the rotating disk is larger than the diameter of the fixed seat.

4. A multi-applicable-scenario mobile driving machine according to claim 1, characterized in that: Both the limiting piece and the grinding piece are symmetrically arranged with respect to the central axis of the rotating disk.

5. The multi - applicable - scenario mobile driving machine according to claim 4, characterized in that: The connecting block is slidably connected to the docking seat.

6. The multi-applicable-scenario mobile driving machine according to claim 5, characterized in that: The end of the traction wire is connected with a sliding block, and a third spring is fixedly connected to the outer wall of the sliding block, and a supporting plate is arranged at the bottom of the sliding block.

7. A mobile driving machine applicable to multiple scenarios according to claim 6, characterized in that: The connecting through holes are arranged at equal angles.

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