A side slide adjustment linkage for an aircraft mechanic seat

Abstract

The utility model discloses a kind of side slide adjustment connecting rod mechanisms of aeronautical machinery seat, belong to aeronautical seat mechanical technical field.The mechanism includes side slide adjustment rotating wheel, chair pipe, side slide adjustment locking pin, first connecting sheet and second connecting sheet, rotating sheet and rear slider that are connected in turn.The rotating sheet is driven by rotating wheel, and the locking pin is driven to complete unlocking by the first connecting sheet and the second connecting sheet that are shortened and arranged in arc shape;While the rotating sheet length is lengthened, width is thinned, and longitudinal avoiding space is formed with rear slider when the lowest position of seat.The utility model significantly increases the stroke of locking pin under the premise of not changing the appearance of seat and installation boundary, ensures that the lowest position side slide function is reliable, improves man-machine efficacy.

Description

Technical Field

[0001] This utility model relates to the field of aircraft seat mechanical technology, and in particular to a side-sliding adjustment linkage mechanism for an aircraft mechanical seat. Background Technology

[0002] When a certain type of aircraft seat is adjusted to its lowest position, the seat surface sinks, causing the rear slider to approach the side-sliding adjustment mechanism. This compresses the movement space of the rotating plate and connecting plate, resulting in insufficient travel of the locking pin and failure of the side-sliding function. Traditional solutions require increasing the overall size of the mechanism or seat envelope, which introduces weight, cost, and airworthiness risks. Therefore, a lightweight improvement solution that can reliably unlock the seat within existing limitations is urgently needed. Utility Model Content

[0003] The purpose of this invention is to provide a side-sliding adjustment linkage mechanism for an aircraft mechanical seat, thereby solving the aforementioned problems existing in the prior art.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A side-sliding adjustment linkage mechanism for an aircraft mechanical seat includes:

[0006] The side-sliding adjustment wheel is installed on the side of the seat frame for occupant operation;

[0007] The chair tube extends along the front-to-back direction of the seat and has a locking hole;

[0008] The side-sliding adjustment locking pin is slidably set in the locking hole of the chair tube;

[0009] The rear slider is fixed below the seat surface assembly and moves with the seat as it is raised and lowered.

[0010] The rotating plate is pivotally connected to the seat frame and is driven by the side-sliding adjustment wheel;

[0011] The first connecting piece and the second connecting piece are connected in series between the rotating piece and the side sliding adjustment locking pin;

[0012] The pivot points of the rotating plate and the first connecting plate, the pivot points of the first connecting plate and the second connecting plate, and the pivot points of the second connecting plate and the side-sliding adjustment locking pin are arranged in the same plane. The first connecting plate is arc-shaped and shortened to increase the unlocking stroke of the side-sliding adjustment locking pin in a limited space. The rotating plate extends along the length direction and narrows along the width direction, so as to maintain longitudinal avoidance with the rear slider when the seat is at its lowest position.

[0013] In some specific embodiments, the connecting piece includes a first connecting piece and a second connecting piece. The first end of the first connecting piece is hinged to the first pivot hole of the rotating piece via a first pivot, and the second end is hinged to the first end of the second connecting piece via a second pivot. The second end of the second connecting piece is hinged to the rear end of the side-sliding adjustment locking pin via a third pivot.

[0014] In some specific embodiments, the first connecting piece is arc-shaped, and the relative angle between the holes at its two ends is 44.1°, in order to increase the curvature and shorten the effective length.

[0015] In some specific embodiments, the rotating plate is an elongated cylindrical plate that is lengthened along the length direction and thinned along the width direction, with its upper edge maintaining a longitudinal gap of ≥2mm with the lower edge of the rear slider when the seat is at its lowest position.

[0016] In some specific embodiments, the rotating plate is provided with a drive hole, a first pivot hole and a second pivot hole. The drive hole is connected to the side-sliding adjusting wheel through a cable or connecting rod. The first pivot hole is hinged to the first connecting plate. The second pivot hole is empty or used to assemble an elastic reset component.

[0017] In some specific embodiments, the second connecting piece is a straight piece with holes at both ends that are hinged to the first connecting piece and the side sliding adjustment locking pin, and the movement plane of the second connecting piece is coplanar with the movement plane of the first connecting piece.

[0018] In some specific embodiments, the side-slip adjustment locking pin is horizontally arranged between the front and rear seat tubes on the same side of the seat. Its front end can be inserted into or removed from the locking hole of the seat tube, and its rear end is hinged to the second connecting piece through a pin.

[0019] In some specific embodiments, the rear slider is fixed to the bottom crossbeam of the seat seat assembly by bolts or rivets, and when the seat is lowered to its lowest position, the rear slider is located directly above the rotating plate.

[0020] In some specific embodiments, the side-slip adjustment wheel is mounted on a fixed bracket on the outside of the seat frame, and its central axis is connected to the drive hole of the rotating plate by a steel wire rope to achieve remote operation.

[0021] In some specific embodiments, all pivot shafts are axially limited by cotter pins or elastic retaining rings, and the entire linkage mechanism is enclosed within the seat side panel to prevent foreign object interference and ensure long-term reliable operation.

[0022] The beneficial effects of this utility model are as follows: This utility model discloses a novel linkage mechanism for adjusting the lowest position side slide of an aircraft mechanical seat, belonging to the field of aircraft seat mechanical technology. The mechanism includes a side slide adjustment wheel, a seat tube, a side slide adjustment locking pin, a first connecting plate and a second connecting plate connected in series, a rotating plate, and a rear slider. The rotating plate is driven by the wheel, and through the shortened and arc-shaped first and second connecting plates, it drives the locking pin to unlock; simultaneously, the length of the rotating plate is increased and its width reduced, creating a longitudinal clearance space with the rear slider when the seat is in its lowest position. The increased curvature of the connecting plates in this utility model effectively improves the space utilization of the side slide adjustment mechanism, increasing the travel of the locking pin within a limited space; the optimized dimensions of the rotating plate, while increasing its length and changing the mating position, reduce its width, increasing the longitudinal distance between it and the rear slider, and increasing the movement space of the side slide adjustment mechanism. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the interference of the seat side-sliding mechanism;

[0024] Figure 2 This is a schematic diagram showing the optimized angle of the hole position on the first connecting piece.

[0025] In the attached diagram: 1. Side-sliding adjustment wheel; 2. Chair tube; 3. Side-sliding adjustment locking pin; 4. Second connecting piece; 5. Rear slider; 6. First connecting piece; 7. Rotating piece. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model.

[0027] Reference Figure 1 and Figure 2 The illustrated side-sliding adjustment linkage mechanism for an aircraft mechanical seat includes:

[0028] Side-sliding adjustment wheel 1 is installed on the side of the seat frame for occupant operation;

[0029] Chair tube 2 extends along the front-to-back direction of the seat and has a locking hole;

[0030] The side-sliding adjustment locking pin 3 is slidably set in the locking hole of the chair tube 2;

[0031] The rear slider 5 is fixed below the seat surface assembly and moves with the seat as it is raised and lowered.

[0032] The rotating plate 7 is pivotally connected to the seat frame and is drivenly connected to the side-sliding adjustment wheel 1;

[0033] The first connecting piece 6 and the second connecting piece 4 are connected in series between the rotating piece 7 and the side-sliding adjustment locking pin 3.

[0034] The pivot points of the rotating plate 7 and the first connecting plate 6, the pivot points of the first connecting plate 6 and the second connecting plate 4, and the pivot points of the second connecting plate 4 and the side sliding adjustment locking pin 3 are arranged in the same plane. The first connecting plate 6 is arc-shaped and shortened to increase the unlocking stroke of the side sliding adjustment locking pin 3 in a limited space. The rotating plate 7 extends along the length direction and narrows along the width direction, so as to maintain longitudinal avoidance with the rear slider 5 when the seat is at its lowest position.

[0035] In this embodiment, the connection method of the above structure is described in detail below:

[0036] I. Detailed Structural Description

[0037] 1. Side-sliding adjustment wheel

[0038] Location: On the fixed bracket on the outside of the right side frame of the seat, with the pivot horizontal and a handle at the outer end.

[0039] Connection: The center hole of the wheel is directly connected to the drive hole of the rotating plate through a steel wire rope.

[0040] Function: When the occupant pulls the handle, the rotating plate rotates clockwise or counterclockwise around the central pivot.

[0041] 2. Chair tube

[0042] Location: Symmetrical on the left and right, extending along the front and back direction of the seat, also serving as a slide rail.

[0043] Structure: Several locking holes are equidistantly provided on the side wall.

[0044] Function: The locking hole works in conjunction with the side-sliding adjustment locking pin to lock the seat in the desired position.

[0045] 3. Side-sliding adjustment locking pin

[0046] Position: It is horizontally inserted into the locking hole of the front and rear seat tubes on the same side, and can slide axially.

[0047] Connection: The tail end is hinged to the far end hole of the second connecting piece via a pin.

[0048] Function: The seat locks when the front end is inserted into the locking hole; the seat can slide laterally when fully withdrawn.

[0049] 4. Rear slider

[0050] Location: Bolts are fixed to the lower part of the rear crossbeam of the seat surface assembly, and rise and fall synchronously with the seat surface.

[0051] Function: When the seat is lowered to its lowest position, the longitudinal gap between the lower edge of the rear slider and the upper edge of the rotating plate is minimized; the width of the rotating plate has been reduced to ensure that the gap is not less than two millimeters, thus avoiding interference.

[0052] 5. Rotating plate

[0053] Location: Mounted on the vertical ear plate of the seat frame via a central pivot, located below the rear slider.

[0054] Structure: The upper end is provided with a drive hole for connecting the steel wire rope; the lower end is provided with a first pivot hole, which is hinged to the first end hole of the first connecting piece through a pin; the length is increased by eight millimeters compared to the original design, and the width is reduced by four millimeters.

[0055] Function: To convert the rotational motion of the wheel into the oscillation of the first connecting plate.

[0056] 6. The first connecting piece is located between the rotating piece and the second connecting piece.

[0057] Structure: The arc-shaped thin sheet has its angle between the line connecting the centers of the holes at both ends and the baseline reduced from 53.7 degrees to 44.1 degrees, shortening the overall length by about 6 millimeters and reducing the bending radius.

[0058] Connection: The first end hole is hinged to the rotating plate, and the last end hole is hinged to the first end hole of the second connecting plate through a pin.

[0059] Function: By utilizing the shortened and bent lever effect, the unlocking stroke of the locking pin is amplified.

[0060] 7. The second connecting piece is located between the first connecting piece and the locking pin.

[0061] Structure: A straight, thin sheet, the same length as the original.

[0062] Connection: The first end hole is hinged to the first connecting piece, and the last end hole is hinged to the tail end of the locking pin.

[0063] Function: To continue transmitting the swing of the first connecting piece to the locking pin.

[0064] II. Operating Method

[0065] Step 1 Preparation

[0066] The seat has been lowered to its lowest position, and the rear slider and the rotating plate maintain a longitudinal safety gap of no less than two millimeters; the locking pin is in the inserted position, and the seat cannot move to the side.

[0067] Step Two Unlock

[0068] The occupant pulls the handle of the side-sliding adjustment wheel upwards, and the wheel rotates clockwise by about 25 to 30 degrees.

[0069] →The steel wire rope pulls the rotating plate to rotate counterclockwise around the central pivot by the same angle.

[0070] →The rotating plate causes the first connecting plate to swing, and through the action of the shortened and bent lever, the second connecting plate moves backward by six to seven millimeters.

[0071] →The locking pin is fully pulled out of the chair tube locking hole, thus unlocking the chair.

[0072] Step 3: Sideslide

[0073] By holding the handle, the seat can slide laterally along the rail to the next position.

[0074] Step Four: Lock

[0075] Release the handle, and the return spring will cause the rotating plate to return to its original position clockwise; the locking pin will be pushed back into the new locking hole by the second connecting plate to complete the locking.

[0076] Through the above structural optimization and operation process, the seat can still smoothly complete the entire process of "unlocking - sliding - locking" in the lowest position without increasing weight or volume.

[0077] In some specific embodiments, the connecting piece includes a first connecting piece 6 and a second connecting piece 4. The first end of the first connecting piece 6 is hinged to the first pivot hole of the rotating piece 7 via a first pivot, and the second end is hinged to the first end of the second connecting piece 4 via a second pivot. The second end of the second connecting piece 4 is hinged to the rear end of the side-sliding adjustment locking pin 3 via a third pivot.

[0078] In this embodiment, the positions of the first connecting piece 6 and the second connecting piece 4 are as follows:

[0079] 1.1 The first connecting piece is located between the rotating piece and the second connecting piece, and is situated in the vertical plane inside the right side frame of the seat; its swing plane is completely coincident with the plane of the rotating piece and the plane of the second connecting piece to prevent additional torque from being generated due to spatial misalignment.

[0080] 1.2 The second connecting piece is located between the first connecting piece and the side sliding adjustment locking pin, with its front end facing the chair tube and its rear end facing the first connecting piece.

[0081] II. Shape and Size

[0082] 2.1 First connecting piece

[0083] Shape: Curved thin plate, two millimeters thick, made of high-strength alloy steel.

[0084] The center distance between the two circular holes was shortened from 28 mm to 22 mm, and the bending radius was 18 mm.

[0085] The angle between the line connecting the centers of the two holes and the reference horizontal line was optimized from 53.7 degrees to 44.1 degrees, making the sheet body more curved and shorter.

[0086] 2.2 Second connecting piece

[0087] Shape: Straight strip thin plate, two millimeters thick, made of the same material as the first connecting piece.

[0088] The center distance between the two round holes is kept at 25 mm to ensure consistency with the original side-sliding adjustment locking pin end interface.

[0089] III. Hinged Relationship

[0090] 3.1 First hinge pin

[0091] The first pivot hole of the rotating plate passes through the first end hole of the first connecting plate.

[0092] The shaft has a diameter of four millimeters and is axially limited at the outer end by a cotter pin, forming a first rotating pair that allows the first connecting piece to swing relative to the rotating piece within a range of zero to thirty-five degrees.

[0093] 3.2 Second hinge pin

[0094] It passes through the end hole of the first connecting piece and the beginning hole of the second connecting piece.

[0095] The shaft has a diameter of four millimeters and is also limited by a cotter pin at the outer end, forming a second rotating pair that allows the second connecting piece to swing relative to the first connecting piece within a range of zero to forty-five degrees.

[0096] 3.3 Third hinge

[0097] The transverse through hole passes through the end hole of the second connecting piece and the end of the side-sliding adjustment locking pin.

[0098] With a shaft diameter of three millimeters, an elastic retaining ring is used for axial positioning, forming a third rotating pair. This ensures that the locking pin only performs linear reciprocating motion within the chair tube, preventing jamming.

[0099] IV. Fit Clearance

[0100] 4.1 The radial clearance of the three rotary joints is controlled within 0.05 to 0.1 mm to ensure flexible rotation and eliminate backlash.

[0101] 4.2. A 0.2 mm thick axial washer is placed between the side of the first connecting piece and the rotating piece, between the first connecting piece and the second connecting piece, and between the second connecting piece and the end of the locking pin to avoid direct contact and friction between the pieces.

[0102] V. Functions and Roles

[0103] 5.1 Increased travel: The arc-shaped and shortened first connecting piece allows the second connecting piece to obtain a greater horizontal displacement while the swing angle of the rotating piece remains unchanged. This increases the unlocking travel of the locking pin from the original five millimeters to more than six millimeters, ensuring that the seat can be fully unlocked even in the lowest position.

[0104] 5.2 Spatial Avoidance: The arc design of the first connecting piece makes its curvature center biased forward and upward, avoiding the projection area of ​​the rear slider when it is at its lowest position during the swing process, thus avoiding structural interference.

[0105] 5.3 Continuous force transmission: The two plates are connected in series to form a two-stage lever, which ensures smooth movement and reduces the elastic deformation and lateral instability that may occur with a single long arm.

[0106] 5.4 Interchangeable maintenance: The first connecting piece and the second connecting piece have independent dimensions and uniform interfaces, and can be replaced separately without disassembling the rotating piece or locking pin, making maintenance convenient.

[0107] In some specific embodiments, the first connecting piece 6 is arc-shaped, and the relative angle between the holes at its two ends is 44.1°, in order to increase the curvature and shorten the effective length.

[0108] In a preferred embodiment, the first connecting piece is an arc-shaped thin plate, two millimeters thick, made of high-strength alloy steel. It has a circular hole at each end, and the angle between the line connecting the centers of the two holes and the horizontal baseline is 44.1 degrees, significantly reduced from the original 53.7 degrees. This reduction in angle shortens the bending radius of the piece, reducing the center distance from 28 millimeters to 22 millimeters, thereby significantly shortening the effective length while maintaining strength.

[0109] The arc-shaped design causes the center of curvature of the first connecting piece to be biased towards the front and upper part of the seat during the swing process. This increases the leverage ratio and effectively avoids the projection area of ​​the rear slider when it is at its lowest position, ensuring that the locking pin gets extra travel and enabling reliable unlocking of the seat at its extreme position.

[0110] In some specific embodiments, the rotating plate 7 is an elongated cylindrical plate that is lengthened along the length direction and thinned along the width direction. Its upper edge maintains a longitudinal gap of ≥2mm with the lower edge of the rear slider 5 when the seat is at its lowest position.

[0111] In one specific embodiment, the rotating plate is generally in the shape of an elongated oval plate, with a thickness of two millimeters, and is made of high-strength alloy steel. Its length is increased by eight millimeters along the front-to-back direction of the seat compared to the original design; its width is reduced by four millimeters along the left-to-right direction of the seat, forming an "elongated and narrowed" shape.

[0112] Due to the reduced width, the upper edge of the rotating plate and the lower edge of the rear slider maintain a longitudinal gap of at least two millimeters even when the seat is at its lowest position, effectively preventing interference between them. At the same time, the increased length extends the lever arm of the rotating plate, enabling it to output a larger horizontal displacement at the same swing angle, thereby amplifying the unlocking stroke of the locking pin and ensuring that the seat can smoothly complete the side-sliding unlocking action even at its lowest position.

[0113] In some specific embodiments, the rotating plate 7 is provided with a drive hole, a first pivot hole and a second pivot hole. The drive hole is connected to the side-sliding adjusting wheel 1 through a cable or connecting rod. The first pivot hole is hinged to the first connecting plate 6. The second pivot hole is empty or used to assemble an elastic reset component.

[0114] In one specific embodiment, the rotating plate is an elongated cylindrical plate with a thickness of two millimeters, made of high-strength alloy steel. A drive hole is centrally located at its upper end for threading a cable or connecting rod. The other end of the cable is connected to a side-sliding adjustment wheel. When the occupant pulls the handle, the cable pulls the drive hole, causing the rotating plate to rotate around its central pivot.

[0115] The lower end of the rotating plate has a first pivot hole and a second pivot hole in sequence:

[0116] The first pivot hole is located below the drive hole and is hinged to the first end round hole of the first connecting piece by a pin, for transmitting swing.

[0117] The second pivot hole is located on the same side or the other side of the first pivot hole. It can be left unused as needed, or a flexible reset component such as a torsion spring or tension spring can be installed so that the rotating plate automatically returns to its original position after the handle is released, ensuring that the locking pin quickly inserts into the chair tube locking hole to achieve reliable locking.

[0118] In some specific embodiments, the second connecting piece 4 is a straight piece with holes at both ends that are hinged to the first connecting piece 6 and the side sliding adjustment locking pin 3, and the movement plane of the second connecting piece 4 is coplanar with the movement plane of the first connecting piece 6.

[0119] In one specific embodiment, the second connecting piece is a long, thin, straight plate, two millimeters thick, and made of high-strength alloy steel. The entire piece is arranged horizontally along the front-to-back direction of the seat, with a round hole at both the front and rear ends: the front round hole is hinged to the end round hole of the first connecting piece via a pin, and the rear round hole is hinged to the end round hole of the side-sliding adjustment locking pin via a pin.

[0120] To ensure smooth movement, the surface of the second connecting piece is completely overlapped with the surface of the first connecting piece in the same vertical plane; in this way, the two pieces will not be misaligned or subject to additional torque during the swinging process, and all forces are transmitted in the same plane, ensuring that the locking pin only performs linear reciprocating motion and avoiding jamming.

[0121] In some specific embodiments, the side-slip adjustment locking pin 3 is horizontally arranged between the front and rear seat tubes 2 on the same side of the seat. Its front end can be inserted into or removed from the locking hole of the seat tube 2, and its rear end is hinged to the second connecting piece 4 through a pin.

[0122] In one specific embodiment, the side-sliding adjustment locking pin adopts a cylindrical long rod structure, horizontally inserted between the front and rear seat tubes on the same side of the seat. The front end of the rod is formed with a conical guide surface, which can smoothly insert into or retract into the locking holes equidistantly opened on the side wall of the seat tube; the rear end of the rod is flat and has a horizontally opened circular hole, in which a pin is inserted and hinged to the end of the second connecting piece. The entire locking pin only performs linear reciprocating motion within the seat tube hole: when the second connecting piece is pulled backward, the locking pin completely retracts from the locking hole, and the seat enters a side-sliding state; when the second connecting piece is pushed forward, the locking pin re-inserts into the corresponding locking hole, and the seat immediately locks. Cotter pins at both ends of the pin prevent it from falling off and ensure long-term reliable operation.

[0123] In some specific embodiments, the rear slider 5 is fixed to the bottom crossbeam of the seat seat assembly by bolts or rivets, and when the seat is lowered to the lowest position, the rear slider 5 is located directly above the rotating plate 7.

[0124] In one specific embodiment, the rear slider is a rectangular block made of high-strength aluminum alloy. Two countersunk holes are machined on its top surface, which are secured to the rear crossbeam of the seat assembly with two bolts or rivets, ensuring that it rises and falls with the crossbeam without relative displacement. When the seat is lowered to its lowest working position along the slide rail, the rear slider is positioned directly above the rotating plate: the lower surface of the rear slider and the upper surface of the rotating plate completely overlap in their longitudinal projections, with a vertical gap of at least two millimeters between them. This arrangement avoids direct contact and interference, while also providing safe space for the rotating plate to swing. This arrangement ensures that the rear slider remains coaxially aligned with the rotating plate throughout the entire seat raising and lowering process, guaranteeing that the mechanism can still unlock or lock smoothly even at its lowest extreme position.

[0125] In some specific embodiments, the side-slip adjustment wheel 1 is mounted on a fixed bracket on the outside of the seat frame, and its central axis is connected to the drive hole of the rotating plate 7 by a steel wire rope to achieve remote operation.

[0126] In one specific embodiment, the side-sliding adjustment wheel is disc-shaped, mounted on a fixed bracket on the outside of the seat frame via rolling bearings. The disc surface is perpendicular to the seat sidewall, and a handle extends outward from the outer edge for easy gripping by the occupant. A short shaft extends inward from the center of the disc, with a high-strength stainless steel wire rope fixed to its end. The other end of the wire rope passes through a guide tube pre-installed in the frame and is securely connected to the drive hole at the upper end of the rotating plate. The wire rope is covered with a wear-resistant sheath to prevent friction with the sharp edges of the frame. When the occupant pulls the handle up or down, the disc rotates accordingly, tightening or loosening the wire rope and causing the rotating plate to swing around its pivot, achieving remote, unobstructed unlocking or locking. The entire transmission path is simple and compact, occupying no extra space, and avoiding assembly errors and jamming risks that may arise from rigid linkages.

[0127] In some specific embodiments, all pivot shafts are axially limited by cotter pins or elastic retaining rings, and the entire linkage mechanism is enclosed within the seat side panel to prevent foreign object interference and ensure long-term reliable operation.

[0128] In one specific embodiment, a transverse through hole is provided at the end of each rotating shaft, and a cotter pin is inserted into the hole. The tail end of the cotter pin is bent outward to form a firm axial stop. For locations where space is limited and bending is inconvenient, an elastic retaining ring is used to embed into the shaft end annular groove, achieving axial locking in the same way. After all rotating pairs are assembled, an integral side guard plate is installed on the outside of the seat frame. The guard plate is made of thin-walled metal or high-strength plastic, and its edges are tightly fitted to the frame with buckles and screws, completely enclosing the rotating plates, connecting plates, locking pins, pulleys, and wire ropes. The inner wall of the side guard plate is lined with shock-absorbing pads to prevent abnormal noises caused by driving vibrations; the outer surface only has a handle hole and a ventilation grille, which not only isolates dust, water droplets, and foreign objects from intrusion but also facilitates daily observation and operation. The enclosed design protects the linkage mechanism from corrosion and impacts throughout its entire life cycle, ensuring long-term reliable operation.

[0129] The working principle of this utility model:

[0130] When the occupant needs to slide the seat to the side, they turn the side-sliding adjustment wheel, which drives the rotating plate to rotate around the central axis via a steel cable. The oscillation of the rotating plate is amplified by a two-stage lever system consisting of the first connecting plate (arc-shaped, shortened, with a 44.1° included angle) and the second connecting plate (straight plate), and is converted into the horizontal linear motion of the side-sliding adjustment locking pin.

[0131] Unlock: The locking pin is pulled out of the seat tube locking hole, and the seat can slide laterally along the slide rail.

[0132] Locking: Release the handle, the return spring returns the rotating plate to its original position, the locking pin re-inserts into the corresponding locking hole, and the seat is fixed.

[0133] The rotating plate is lengthened and width reduced, maintaining a longitudinal gap of ≥2mm with the rear slider, ensuring that the seat can still be fully unlocked without interference when it is in the lowest position.

[0134] Example 1: AW325 Operator Seat

[0135] The rotating plate, the first connecting plate, and the second connecting plate are manufactured according to the dimensions of this utility model and the original parts are replaced.

[0136] One end of the wire rope is fixed to the drive hole of the rotating plate, and the other end is connected to the side-sliding adjustment wheel.

[0137] Adjust the preload of the reset spring to ensure that the locking pin can quickly return to its original position after the handle is released.

[0138] After the seat is lowered to its lowest position, a 1000-cycle side-slip test is conducted. The locking pin travel is ≥6mm, with no jamming or abnormal noise, meeting airworthiness requirements.

[0139] Example 2: AW326 / A Driver's Seat

[0140] Replace the connecting rod as in Example 1.

[0141] Simply adjust the length of the wire rope to suit different wiring configurations.

[0142] After completing 500 cycles, the parts were disassembled and inspected. The wear of each rotating part was less than 0.05 mm, which meets the continuous airworthiness standard.

[0143] Through the practical application of the two types of seats mentioned above, it has been verified that this utility model can significantly improve the reliability of the lowest position side-sliding function of the seat without increasing weight or changing the shape.

[0144] By adopting the above-disclosed technical solution of this utility model, the following beneficial effects are obtained:

[0145] This utility model discloses a novel linkage mechanism for adjusting the lowest position side slide of an aircraft mechanical seat, belonging to the field of aircraft seat mechanical technology. The mechanism includes a side slide adjustment wheel, a seat tube, a side slide adjustment locking pin, a first connecting plate and a second connecting plate connected in series, a rotating plate, and a rear slider. The rotating plate is driven by the wheel and, through the shortened and arc-shaped first and second connecting plates, drives the locking pin to unlock. Simultaneously, the rotating plate is lengthened and its width reduced, creating a longitudinal clearance space with the rear slider when the seat is in its lowest position. The increased curvature of the connecting plates in this utility model effectively improves the space utilization of the side slide adjustment mechanism, increasing the travel of the locking pin within a limited space. The optimized dimensions of the rotating plate, while increasing its length and changing the mating position, reduce its width, increasing the longitudinal distance between it and the rear slider, and thus increasing the movement space of the side slide adjustment mechanism.

[0146] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A side-sliding adjustment linkage mechanism for an aircraft mechanical seat, characterized in that, include: Side-sliding adjustment wheel (1) is installed on the side of the seat frame for occupant operation; The chair tube (2) extends along the front-to-back direction of the seat and has a locking hole; The side-sliding adjustment locking pin (3) is slidably disposed in the locking hole of the chair tube (2); The rear slider (5) is fixed below the seat surface assembly and moves with the seat as it rises and falls; The rotating plate (7) is pivotally connected to the seat frame and is connected in drive to the side-sliding adjustment wheel (1); The first connecting piece (6) and the second connecting piece (4) are connected in series between the rotating piece (7) and the side-sliding adjustment locking pin (3); The pivot points of the rotating piece (7) and the first connecting piece (6), the pivot points of the first connecting piece (6) and the second connecting piece (4), and the pivot points of the second connecting piece (4) and the side-sliding adjustment locking pin (3) are arranged in the same plane. The first connecting piece (6) is arc-shaped and shortened to amplify the unlocking stroke of the side-sliding adjustment locking pin (3) in a limited space. The rotating piece (7) extends along the length direction and narrows along the width direction, so as to maintain longitudinal avoidance with the rear slider (5) when the seat is at its lowest position.

2. The side-sliding adjustment linkage mechanism according to claim 1, characterized in that, The connecting piece includes a first connecting piece (6) and a second connecting piece (4). The first end of the first connecting piece (6) is hinged to the first pivot hole of the rotating piece (7) through a first pivot, and the second end is hinged to the first end of the second connecting piece (4) through a second pivot. The second end of the second connecting piece (4) is hinged to the rear end of the side-sliding adjustment locking pin (3) through a third pivot.

3. The side-slip adjustment linkage mechanism according to claim 2, characterized in that, The first connecting piece (6) is arc-shaped, and the relative angle between the holes at both ends is 44.1°, in order to increase the curvature and shorten the effective length.

4. The side-slip adjustment linkage mechanism according to claim 3, characterized in that, The rotating plate (7) is an elongated plate that is lengthened along the length direction and thinned along the width direction. When the upper edge of the plate is at its lowest position, it maintains a longitudinal gap of ≥2mm with the lower edge of the rear slider (5).

5. The side-sliding adjustment linkage mechanism according to claim 4, characterized in that, The rotating plate (7) is provided with a drive hole, a first pivot hole and a second pivot hole. The drive hole is connected to the side-sliding adjusting wheel (1) by a cable or a connecting rod. The first pivot hole is hinged to the first connecting plate (6). The second pivot hole is empty or used to assemble an elastic reset component.

6. The side-sliding adjustment linkage mechanism according to claim 2, characterized in that, The second connecting piece (4) is a straight piece, with holes at both ends that are hinged to the first connecting piece (6) and the side sliding adjustment locking pin (3), and the movement plane of the second connecting piece (4) is coplanar with the movement plane of the first connecting piece (6).

7. The side-sliding adjustment linkage mechanism according to claim 1, characterized in that, The side-slip adjustment locking pin (3) is horizontally arranged between the front and rear seat tubes (2) on the same side of the seat. Its front end can be inserted into or removed from the locking hole of the seat tube (2), and its rear end is hinged to the second connecting piece (4) through a pin.

8. The side-slip adjustment linkage mechanism according to claim 1, characterized in that, The rear slider (5) is fixed to the bottom crossbeam of the seat seat assembly by bolts or rivets. When the seat is lowered to the lowest position, the rear slider (5) is located directly above the rotating plate (7).

9. The side-slip adjustment linkage mechanism according to claim 1, characterized in that, The side-slip adjustment wheel (1) is mounted on a fixed bracket on the outside of the seat frame. Its central axis is connected to the drive hole of the rotating plate (7) by a steel wire rope to achieve remote operation.

10. The side-slip adjustment linkage mechanism according to any one of claims 1 to 9, characterized in that, All pivots are axially limited by cotter pins or elastic retaining rings, and the entire linkage mechanism is enclosed within the seat side panel to prevent interference from foreign objects and ensure long-term reliable operation.

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