Mechanical part bending device
By designing mechanical parts bending devices for brackets, workbenches and purification devices, the problems of bending inconvenience and debris in the existing technology are solved, and the rapid, automatic bending and size adjustment of different models of parts are achieved, improving the Processing quality and stability.
Patent Information
- Application Number
- CN202411816989.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-11
- Publication Date
- 2025-01-14
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
The existing bending technology is difficult to effectively bending and processing different models of mechanical parts, and residues are easily generated during bending, affecting the processing quality.
A mechanical component bending device is designed, including a bracket, a workbench, a clamping device and a purification device. The universal performance of bending arc is achieved through the cooperation of circular shapes and long strip notches, and the servo motor and wire stalk are realized. Automatic bending and size adjustment of parts, and waste chips are collected and processed through purification devices to improve cleanliness and processing quality.
It realizes rapid and automatic bending and size adjustment of different models of parts, reduces residue pollution, and improves processing quality and equipment stability.
Smart Images
Figure CN119304004A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of stamping technology, in particular to a mechanical component bending device. Background Art
[0002] The bending machine is an important equipment for bending and forming workpieces. Its function is to press steel plates into parts of various shapes according to process requirements. The bending machine is a machine that can bend thin plates. When in use, the coil is energized by a wire, and after power is turned on, a gravitational force is generated on the pressure plate, thereby clamping the thin plate between the pressure plate and the base. It is often used to bend mechanical parts, steel bars, and plates to meet people's needs.
[0003] In the bending technology in the prior art, the diameter of the actual bending material is mainly determined by rotating and adjusting the position of the baffle rod, and finally the baffle rod and the parts are used to extrude to achieve the purpose of completely bending materials of different sizes. However, the processing limitations are large, and it is difficult to bend parts of different models. In addition, debris is likely to appear at the bending point of the parts during bending, which can easily affect the internal use. Summary of the invention
[0004] In view of the deficiencies in the prior art, the present invention provides a mechanical component bending device to solve the above problems.
[0005] In order to achieve the above-mentioned purpose of automatically improving the universal performance of the bending arc and reducing the pollution of debris, the present invention is implemented through the following technical scheme: a mechanical parts bending device, including a bracket, a workbench is provided on the upper surface of the bracket, and the upper surface of the bracket is fixedly connected to the lower surface of the workbench, and a clamping device is provided at the right end of the bracket. Through the setting of the clamping device, it is ensured that the bending arc has certain universal performance, and through the cooperation of the circular and long strip-shaped notches and the clamping device, the function of expanding the universal performance is achieved, the stability effect is increased, and the use effect when the internal workpiece is stable is improved, and the right end of the bracket is fixedly connected to the left end of the clamping device, and the right end of the clamping device is provided with a connecting piece, and the right end of the clamping device is movably connected to the lower end of the connecting piece.
[0006] The workbench includes a side plate, a table top is provided at the left end of the side plate, and the left end of the side plate is fixedly connected to the right end of the table top, a purification device is provided in the middle of the left end of the side plate, and the middle of the left end of the side plate is fixedly connected to the right end of the purification device. Through the setting of the purification device, a certain clean effect is guaranteed inside, the neatness of the interior is improved, and the processing quality of the equipment is more outstanding. A central axis is provided in the inner cavity of the purification device, and the inner cavity of the purification device is fixedly connected to the outer surface of the central axis. A cylindrical member is sleeved on the outer side of the central axis, and the outer side of the central axis is fixedly connected to the inner surface of the cylindrical member. A socket member is provided at the right end of the cylindrical member, and the right end of the cylindrical member is fixedly connected to the left end of the socket member. A central axis is provided on the lower surface of the socket member, and the lower surface of the socket member is fixedly connected to the upper surface of the central axis. A blocking rod member is provided on the top of the purification device, and the top of the purification device is fixedly connected to the lower surface of the blocking rod member.
[0007] Preferably, a connecting piece is provided at the top of the workbench, and the top of the workbench is fixedly connected to the lower end of the connecting piece, and a groove is provided in the inner cavity of the connecting piece. Through the setting of the clamping device, it is ensured that the bending arc has certain universal performance, and through the cooperation of the circular and elongated notches with the clamping device, the function of expanding the universal performance is achieved, the stability effect is increased, and the use effect when the internal workpiece is stable is improved, and the workbench is connected to the clamping device through the steel wire stem in the inner groove of the connecting piece.
[0008] Preferably, the number of the purification devices is two, and the purification devices are divided into upper and lower sides, the center points of the purification devices and the central axis are on the same straight line, the purification device also includes a support body, the inner cavity of the support body is provided with an adsorption groove, the adsorption groove opened at the support body will collect and process floating waste chips, and when the central axis swings, the central axis will squeeze the metal cavity to move, and the inner cavity of the support body is fixedly connected to the outer surface of the adsorption groove, the upper part of the inner wall of the support body is provided with a metal cavity, and the upper part of the inner wall of the support body is fixedly connected to the side of the metal cavity, the inner cavity of the metal cavity is provided with a spray column, and the inner cavity of the metal cavity is fixedly connected to the outer surface of the spray column, the metal cavity and the support body are coated with adhesive, and there are three pairs of metal cavities, the adsorption grooves are symmetrically arranged with reference to the edge line of the support body, there are two supports, the metal cavity is a cube, and the support body and the spray column are placed vertically.
[0009] Preferably, the clamping device includes a cavity seat, the traction member is movably connected to the cavity seat, the cavity seat is expanded by the tightening force of the wire stem exerted on the traction member, the traction member swings to a certain extent, and the cavity seat will support the extrusion rod to move when it is expanded, the traction member is provided on the side of the cavity seat, and the side of the cavity seat is movably connected to the outer surface and inner surface of the traction member, the inner wall of the cavity seat is provided with an extrusion rod, and the inner wall of the cavity seat is fixedly connected to the outer surface of the extrusion rod, the outer cavity of the extrusion rod is provided with a support member, and the outer cavity of the extrusion rod is movably connected to the inner cavity of the support member, the extrusion rod A column is arranged on the side of the pressure rod, and the side of the extrusion rod is fixedly connected to the lower end of the column, an auxiliary part is arranged on the bottom end of the column, and the bottom end of the column is fixedly connected to the upper end of the auxiliary part, there are two support parts in total, and the height of the support part is higher than the height of the extrusion rod, when the extrusion rod is expanded outward, the extrusion rod at the rear end is operated by the reverse force, and the support part acts as a fulcrum, and adhesive is coated between the column and the auxiliary part, there are two auxiliary parts in total, and there are two pairs of extrusion rods in total, and the center line of the traction part and the cavity seat are in the same straight line.
[0010] The present invention provides a mechanical parts bending device having the following beneficial effects: (I) The mechanical parts bending device has round holes and long inner grooves opened inside the side vertical plate, and the plate parts or steel bar parts to be bent are passed through the inside of the side vertical plate and inserted into the outside of the blocking rod, so that the equipment has a certain processing function, improves the internal processing effect, and lays the foundation for subsequent processing.
[0011] (ii) The mechanical parts bending device drives the cylindrical part to move by energizing the central shaft. The cylindrical part is fixedly connected to the socket part, and the socket part moves accordingly. The socket part rotates at a certain angle and is socketed on the top of the central shaft. The socket part drives the central shaft to bend the parts inside the stop rod. The parts tend to bend as the central shaft moves, so that the internal parts have an automatic bending effect, so that the purpose of adjusting the bending degree at will is achieved, and the function of rapid bending is realized.
[0012] (III) The bending device for mechanical parts is unfolded by the tightening force of the wire stem on the traction member of the cavity seat. The traction member swings to a certain extent. When the cavity seat is unfolded, it will support the extrusion rod to move. The extrusion rod moves along the inner cavity of the support member. The extrusion rod gradually pulls the column to run. When the extrusion rod is unfolded outward, the extrusion rod at the rear end is operated by the reverse force. The support member acts as a fulcrum. The extrusion rod at the rear end swings with the column. The column moves toward the middle and gradually squeezes the thickness of the placed parts. The two columns are affected by the clamping force and gradually move relative to each other. The columns are brought together and fixed in the middle, thereby improving the general performance of parts processing, realizing the effect of automatically adjusting the size of parts, and achieving the purpose of automatically adjusting the length.
[0013] (IV) The mechanical parts bending device collects and processes the floating waste chips through the adsorption groove opened at the support body. When the central axis swings, the central axis squeezes the metal cavity to move. The metal cavity contains a capsule, and the purification solution inside the capsule is squeezed out. The purification solution contains carboxylic acid components, so as to achieve the purpose of treating the internal rust stains and realize the effect of rapid operation. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a structural schematic diagram of the side standing plate of the present invention; Figure 3 It is a schematic diagram of the structure of the purification device of the present invention; Figure 4 It is a structural schematic diagram of the central axis of the present invention; Figure 5 It is a structural schematic diagram of the cavity seat of the present invention; Figure 6 It is a schematic structural diagram of the clamping device of the present invention; Figure 7 It is a structural schematic diagram of the support member of the present invention; Figure 8 It is a schematic diagram of the metal cavity structure in the purification device of the present invention.
[0015] In the figure: 1. bracket; 2. workbench; 3. clamping device; 4. connecting part; 21. side plate; 22. table; 23. purification device; 24. central axis; 25. cylindrical part; 26. sleeve part; 27. central axis; 28. blocking rod part; 31. cavity seat; 32. traction part; 33. extrusion rod part; 34. support part; 35. column; 36. auxiliary part; 231. support body; 232. adsorption tank; 233. metal cavity; 234. spray column body. DETAILED DESCRIPTION
[0016] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses. Example
[0017] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 8 , the present invention provides a technical solution: a mechanical parts bending device, comprising a bracket 1, a workbench 2 is arranged on the upper surface of the bracket 1, and the upper surface of the bracket 1 is fixedly connected to the lower surface of the workbench 2; The workbench 2 includes a side plate 21, a table top 22 is provided at the left end of the side plate 21, and the left end of the side plate 21 is fixedly connected to the right end of the table top 22, a purification device 23 is provided in the middle of the left end of the side plate 21, and the middle of the left end of the side plate 21 is fixedly connected to the right end of the purification device 23. Through the setting of the purification device 23, it is ensured that the interior has a certain cleaning effect, the cleanliness of the interior is improved, and the processing quality of the equipment is more outstanding. The inner cavity of the purification device 23 is provided with a central axis 24, and the inner cavity of the purification device 23 and the central axis are connected. The outer surface of the purifying device 23 is fixedly connected, the outer side of the central axis 24 is sleeved with a cylindrical member 25, and the outer side of the central axis 24 is fixedly connected to the inner surface of the cylindrical member 25, the right end of the cylindrical member 25 is provided with a sleeve member 26, and the right end of the cylindrical member 25 is fixedly connected to the left end of the sleeve member 26, the lower surface of the sleeve member 26 is provided with a central shaft 27, and the lower surface of the sleeve member 26 is fixedly connected to the upper surface of the central shaft 27, and the top of the purifying device 23 is provided with a blocking rod member 28, and the top of the purifying device 23 is fixedly connected to the lower surface of the blocking rod member 28.
[0018] A connecting piece 4 is provided at the top of the workbench 2, and the top of the workbench 2 is fixedly connected to the lower end of the connecting piece 4. A groove is provided in the inner cavity of the connecting piece 4. Through the setting of the clamping device 3, it is ensured that the bending arc has certain universal performance. Through the cooperation of the circular and long strip-shaped notches with the clamping device 3, the function of expanding universal performance is achieved, the stability effect is increased, and the use effect when the internal workpiece is stable is improved. The workbench 2 is connected to the clamping device 3 through the steel wire stem in the inner groove of the connecting piece 4.
[0019] The number of purification devices 23 is two layers, and the purification device 23 is divided into upper and lower sides. The center points of the purification device 23 and the central axis 24 are on the same straight line. The purification device 23 also includes a support body 231. The inner cavity of the support body 231 is provided with an adsorption groove 232. The adsorption groove 232 opened at the support body 231 will collect and process the floating waste, and when the central axis 27 swings, the central axis 27 will squeeze the metal cavity 233 to move, and the inner cavity of the support body 231 is fixedly connected to the outer surface of the adsorption groove 232, and the upper part of the inner wall of the support body 231 is provided with a metal cavity The metal cavity 233 is provided with a spray column 234 in the inner cavity of the metal cavity 233, and the inner cavity of the metal cavity 233 is fixedly connected to the outer surface of the spray column 234. Adhesive is coated between the metal cavity 233 and the support body 231, and there are three pairs of metal cavities 233. The adsorption grooves 232 are symmetrically arranged with reference to the edge line of the support body 231. There are two support bodies 231, and the metal cavity 233 is a cube, and the support body 231 and the spray column 234 are placed vertically.
[0020] When in use, first check the installation and safety protection of the present invention, start the servo motor, and open a round hole and a long inner groove inside the side plate 21. Pass the plate or steel bar parts that need to be bent through the inside of the side plate 21 and insert them on the outside of the blocking rod 28, so that the equipment has a certain processing function, improves the internal processing effect, and lays the foundation for subsequent processing.
[0021] When waste chips appear in the parts processed by the equipment, the waste chips will fall to the bottom and be located inside the support body 231. The adsorption groove 232 opened at the support body 231 will collect and process the floating waste chips. Moreover, when the central shaft 27 swings, the central shaft 27 will squeeze the metal cavity 233 to move. The metal cavity 233 contains a capsule inside, and the purification solution inside the capsule is squeezed out. The purification solution contains carboxylic acid components, so as to achieve the purpose of treating the internal rust stains and realize the effect of rapid operation.
[0022] The central shaft 27 is in a fitted state with the stop rod 28 by default. When it needs to be bent, the servo motor is started, the central shaft 24 is energized to drive the cylindrical member 25 to run, the cylindrical member 25 is fixedly connected to the socket 26, the socket 26 moves accordingly, the socket 26 rotates at a certain angle, the socket 26 is socketed on the top of the central shaft 27, the socket 26 drives the central shaft 27 to bend the parts inside the stop rod 28, the parts tend to bend as the central shaft 27 moves, and the internal parts have an automatic bending effect, so that the purpose of adjusting the bending degree at will and the function of rapid bending are realized.
[0023] In addition, when the central shaft 24 rotates, the central shaft 24 will link the steel wire stem inside the connecting member 4 to run. One end of the steel wire stem in the inner cavity of the connecting member 4 is connected to the central shaft 24, and the other end is connected to the traction member 32 along the inner groove of the connecting member 4. The traction member 32 is movably connected to the cavity seat 31. The cavity seat 31 is unfolded by the tightening force of the steel wire stem exerted on the traction member 32. The traction member 32 swings to a certain extent. When the cavity seat 31 is unfolded, it will support the extrusion rod 33 to move. The extrusion rod 33 moves along the inner cavity of the support member 34, and the extrusion rod 33 gradually pulls the column When the extrusion rod 33 is running, when the extrusion rod 33 is expanded outward, the extrusion rod 33 at the rear end is operated by the reverse force, and the support member 34 acts as a fulcrum. The extrusion rod 33 at the rear end and the column 35 swing with each other, and the column 35 moves toward the middle, and the column 35 gradually squeezes the thickness of the placed parts. The two columns 35 are gradually moved relative to each other due to the clamping force, and the columns 35 are brought together. The columns 35 fix the middle part, thereby improving the general performance of parts processing, realizing the effect of automatically adjusting the size of parts, and achieving the purpose of automatically adjusting the length. Example
[0024] See also Figure 1-Figure 8 The present invention provides a technical solution: on the basis of embodiment 1, a clamping device 3 is provided at the right end of the bracket 1. Through the setting of the clamping device 3, it is ensured that the bending curvature has certain universal performance. Through the cooperation of the circular and long strip-shaped notches with the clamping device 3, the function of expanding the universal performance is achieved, the stability effect is increased, and the use effect when the internal workpiece is stable is improved. The right end of the bracket 1 is fixedly connected to the left end of the clamping device 3, and the right end of the clamping device 3 is provided with a connecting piece 4, and the right end of the clamping device 3 is movably connected to the lower end of the connecting piece 4.
[0025] The clamping device 3 includes a cavity seat 31, a traction member 32 movably connected to the cavity seat 31, the cavity seat 31 is unfolded by the tightening force of the wire stem exerted on the traction member 32, and the traction member 32 swings to a certain extent. When the cavity seat 31 is unfolded, it will support the extrusion rod 33 to move. The traction member 32 is provided on the side of the cavity seat 31, and the side of the cavity seat 31 is movably connected to the outer surface and inner surface of the traction member 32. The inner wall of the cavity seat 31 is provided with an extrusion rod 33, and the inner wall of the cavity seat 31 is fixedly connected to the outer surface of the extrusion rod 33. The outer cavity of the extrusion rod 33 is provided with a support member 34, and the outer cavity of the extrusion rod 33 is movably connected to the inner cavity of the support member 34. The extrusion rod A column 35 is provided on the side of 33, and the side of the extrusion rod 33 is fixedly connected to the lower end of the column 35, an auxiliary part 36 is provided at the bottom end of the column 35, and the bottom end of the column 35 is fixedly connected to the upper end of the auxiliary part 36, there are two support members 34, and the height of the support member 34 is higher than the height of the extrusion rod 33. When the extrusion rod 33 is expanded outward, the extrusion rod 33 at the rear end is operated by the reverse force, and the support member 34 acts as a fulcrum. Adhesive glue is coated between the column 35 and the auxiliary part 36. There are two auxiliary parts 36, and there are two pairs of extrusion rods 33, and the traction member 32 is on the same straight line with the center line of the cavity seat 31.
[0026] When in use, first check the installation and safety protection of the present invention, start the servo motor, and open a round hole and a long inner groove inside the side plate 21. Pass the plate or steel bar parts that need to be bent through the inside of the side plate 21 and insert them on the outside of the blocking rod 28, so that the equipment has a certain processing function, improves the internal processing effect, and lays the foundation for subsequent processing.
[0027] In addition, when the central shaft 24 rotates, the central shaft 24 will link the steel wire stem inside the connecting member 4 to run. One end of the steel wire stem in the inner cavity of the connecting member 4 is connected to the central shaft 24, and the other end is connected to the traction member 32 along the inner groove of the connecting member 4. The traction member 32 is movably connected to the cavity seat 31. The cavity seat 31 is unfolded by the tightening force of the steel wire stem exerted on the traction member 32. The traction member 32 swings to a certain extent. When the cavity seat 31 is unfolded, it will support the extrusion rod 33 to move. The extrusion rod 33 moves along the inner cavity of the support member 34, and the extrusion rod 33 gradually pulls the column When the extrusion rod 33 is running, when the extrusion rod 33 is expanded outward, the extrusion rod 33 at the rear end is operated by the reverse force, and the support member 34 acts as a fulcrum. The extrusion rod 33 at the rear end and the column 35 swing with each other, and the column 35 moves toward the middle, and the column 35 gradually squeezes the thickness of the placed parts. The two columns 35 are gradually moved relative to each other due to the clamping force, and the columns 35 are brought together. The columns 35 fix the middle part, thereby improving the general performance of parts processing, realizing the effect of automatically adjusting the size of parts, and achieving the purpose of automatically adjusting the length.
[0028] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without creative work should fall within the scope of protection of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention are implemented according to the conventional means in the field unless otherwise specified and limited.
Claims
1. A mechanical component bending device, comprising a bracket (1), characterized in that: A workbench (2) is provided on the upper surface of the bracket (1), and the upper surface of the bracket (1) is fixedly connected to the lower surface of the workbench (2); a clamping device (3) is provided at the right end of the bracket (1), and the right end of the bracket (1) is fixedly connected to the left end of the clamping device (3); a connecting piece (4) is provided at the right end of the clamping device (3), and the right end of the clamping device (3) is movably connected to the lower end of the connecting piece (4); The workbench (2) comprises a side plate (21), a table top (22) is arranged at the left end of the side plate (21), and the left end of the side plate (21) is fixedly connected to the right end of the table top (22), a purification device (23) is arranged in the middle of the left end of the side plate (21), and the middle of the left end of the side plate (21) is fixedly connected to the right end of the purification device (23), the inner cavity of the purification device (23) is provided with a central axis (24), and the inner cavity of the purification device (23) is fixedly connected to the outer surface of the central axis (24), and the outer side of the central axis (24) is sleeved with A cylindrical member (25) is provided, and the outer side of the central axis (24) is fixedly connected to the inner surface of the cylindrical member (25); a sleeve member (26) is provided at the right end of the cylindrical member (25), and the right end of the cylindrical member (25) is fixedly connected to the left end of the sleeve member (26); a central axis (27) is provided on the lower surface of the sleeve member (26), and the lower surface of the sleeve member (26) is fixedly connected to the upper surface of the central axis (27); a blocking rod member (28) is provided at the top of the purification device (23), and the top of the purification device (23) is fixedly connected to the lower surface of the blocking rod member (28).
2. A mechanical component bending device according to claim 1, characterized in that: The top of the workbench (2) is provided with a connecting piece (4), and the top of the workbench (2) is fixedly connected to the bottom of the connecting piece (4), the inner cavity of the connecting piece (4) is provided with a groove, and the workbench (2) is connected to the clamping device (3) through a steel wire rod in the inner groove of the connecting piece (4).
3. A mechanical component bending device according to claim 1, characterized in that: The number of the purification devices (23) is two in total, and the purification devices (23) are divided into upper and lower sides, and the center points of the purification devices (23) and the central axis (24) are on the same straight line.
4. The mechanical component bending device according to claim 1, characterized in that: The purification device (23) further comprises a support body (231); an inner cavity of the support body (231) is provided with an adsorption groove (232), and the inner cavity of the support body (231) is fixedly connected to the outer surface of the adsorption groove (232); a metal cavity (233) is provided on the upper part of the inner wall of the support body (231), and the upper part of the inner wall of the support body (231) is fixedly connected to the side of the metal cavity (233); a spray column (234) is provided in the inner cavity of the metal cavity (233), and the inner cavity of the metal cavity (233) is fixedly connected to the outer surface of the spray column (234).
5. A mechanical component bending device according to claim 4, characterized in that: An adhesive is coated between the metal cavities (233) and the support body (231), and there are three pairs of metal cavities (233) in total. The adsorption grooves (232) are symmetrically arranged with reference to the edge line of the support body (231).
6. A mechanical component bending device according to claim 4, characterized in that: There are two support bodies (231) in total, and the metal cavity (233) is a cube, and the support body (231) and the spray column body (234) are placed vertically.
7. The mechanical component bending device according to claim 1, characterized in that: The clamping device (3) comprises a cavity seat (31), a traction member (32) is arranged on a side of the cavity seat (31), and the side of the cavity seat (31) is movably connected to the outer surface and inner surface of the traction member (32), an extrusion rod (33) is arranged on the inner wall of the cavity seat (31), and the inner wall of the cavity seat (31) is fixedly connected to the outer surface of the extrusion rod (33), a support member (34) is arranged on the outer cavity of the extrusion rod (33), and the outer cavity of the extrusion rod (33) is movably connected to the inner cavity of the support member (34), a column (35) is arranged on the side of the extrusion rod (33), and the side of the extrusion rod (33) is fixedly connected to the lower end of the column (35), and an auxiliary member (36) is arranged at the bottom end of the column (35), and the bottom end of the column (35) is fixedly connected to the upper end of the auxiliary member (36).
8. A mechanical component bending device according to claim 7, characterized in that: There are two support members (34) in total, and the height of the support members (34) is higher than the height of the extrusion rod member (33). Adhesive glue is coated between the upright column (35) and the auxiliary member (36).
9. The mechanical component bending device according to claim 7, characterized in that: There are two auxiliary members (36) in total, and two pairs of extrusion rods (33) in total, and the center lines of the traction member (32) and the cavity seat (31) are on the same straight line.