Seat front-back adjusting mechanism

Abstract

The utility model belongs to the technical field of seats, and relates to a seat front-back adjusting mechanism which comprises a sliding rail and a seat leg fixing structure, the sliding rail is provided with a T-shaped groove in a base plate, arc-shaped grooves are formed in the opposite side faces of the two side walls of the T-shaped groove, and the seat leg fixing structure comprises a shell. A first limiting block which can slide on the T-shaped groove and limit the shell to move in the vertical direction is arranged on the front side or / and the rear side of the shell, a second limiting block which limits the shell to move front and back is arranged in the middle of the shell, a torsion spring is hinged to the position, between the first limiting block and the second limiting block, of the shell through a pin or a screw, and the two ends of the torsion spring abut against the first limiting block and the second limiting block respectively. The pull rod arranged on the shell moves upwards to drive the second limiting block to move upwards to be separated from the arc-shaped groove, the second limiting block drives the torsion spring to rotate at the same time and presses the first limiting block downwards so that a gap can be formed between the first limiting block and the upper wall in the T-shaped groove, the shell can move front and back, and the device has the advantages of being simple in structure, convenient to adjust and stable in performance.

Description

Technical Field

[0001] The invention belongs to the technical field of seats, and in particular relates to a front-rear adjustment mechanism for a seat. Background Art

[0002] Space on airplanes or high-speed trains is very precious. The front-to-back distance of seats installed thereon is mostly relatively fixed. However, the legroom required by different drivers or passengers is different. In addition, airplanes in flight or high-speed trains in travel are constantly bumping and vibrating due to environmental changes such as airflow, pressure, road surface and tracks. Airplane seats, high-speed train seats or vehicle seats are not allowed to shake due to loose fixation. This brings difficulties and troubles to some special situations where the front-to-back distance of seats needs to be adjusted. Currently, airplane or high-speed train seats are basically fixed or professionals use special tools to manually adjust a single locking block to achieve the front-to-back adjustment function of the seat. This cannot meet the needs of users to adjust the seats themselves. It is an adjustment and fixing method that urgently needs to be solved for airplane or high-speed train seats. Summary of the Invention

[0003] The object of the present invention is to provide a seat front and rear adjustment mechanism which has a simple structure and is convenient for adjusting the front and rear position of the seat.

[0004] The object of the present invention is to solve like this:

[0005] The cam is secured to the upper and lower sides of the base frame so that the cam can be adjusted to accommodate the seat frame, and the cam is secured to the upper and lower sides of the base frame so that the cam can be adjusted to accommodate the seat frame.

[0006] As a further optimization of the above technical solution, the front side and / or rear side of the shell is provided with a mounting plate extending toward the front side and / or rear side, and the lower two sides of the first limit block are respectively provided with limit arms extending into the T-slot, and the middle is provided with a first groove, and the mounting plate extends into the first groove, and the first limit block is slid and fixed on the shell by a screw passing through the upper arm plate of the first groove, the first groove, the mounting plate and the bottom wall of the first groove, and a first return spring is mounted on the screw between the upper arm plate of the first groove and the mounting plate.

[0007] As a further optimization of the above technical solution, the second limit block includes a cylinder whose front and rear sides can respectively match the arc groove and can be inserted into the arc groove, and the front and rear cylinders are connected by a connecting block in the middle, and the connecting block is fixed with the pull rod by bolts, and the pull rod passes through the first through hole in the middle of the shell and extends out of the shell. The middle and lower parts of the first through hole are expanded to form a spring chamber, and one end of the second return spring mounted on the pull rod in the spring chamber is connected to the upper wall of the spring chamber, and the other end is connected to the upper surface of the connecting block.

[0008] As a further optimization of the above technical solution, a vertical weight-reducing through hole is provided in the middle of the cylinder.

[0009] As a further optimization of the above technical solution, the arcuate surfaces on the left and right sides of the cylinder match the arcuate surfaces of the arcuate groove.

[0010] As a further optimization of the above technical solution, a connecting joint is fixed on the pull rod extending out of the shell, and the lower end surface of the connecting joint is in contact with the upper surface of the shell to limit the downward extension length of the second limit block.

[0011] As a further optimization of the above technical solution, a wire terminal mounting hole is provided on the connecting block.

[0012] As a further optimization of the above technical solution, two or more seat leg mounting holes are arranged at intervals on the shell.

[0013] As a further optimization of the above technical solution, the lower surface of the shell is provided with a second groove connected front to back for the first limit block and the second limit block to move up and down, and a torsion spring abutment position is provided on the opposite sides of the first limit block and the second limit block. The torsion spring is hinged in the second groove between the first limit block and the second limit block through a pin or a screw, and one end of the torsion spring abuts on the torsion spring abutment position of the first limit block, and the other end abuts on the torsion spring abutment position of the second limit block.

[0014] The advantages of the present invention over the prior art are:

[0015] 1. The present invention can unlock and lock the entire mechanism by adjusting the pull-wire terminal, so that passengers can easily adjust the front and rear distance of the seat without the help of special tools, which is simple and convenient.

[0016] 2. The present invention adopts the seat slide rails commonly used in current large aircraft, and invents and innovates on this basis, so that the seats installed with the current mechanism can be adjusted without replacing the slide rails on airplanes or high-speed trains, which is simple and worry-free for airlines and OEMs.

[0017] 3. The present invention has a simple and compact structure, is easy to install, and does not significantly increase the weight of the seat, thus meeting the strict weight requirements of airlines and also meeting large-scale production, with obvious cost-effectiveness.

[0018] 4. The present invention is modular and easy to assemble and disassemble, making it convenient for repair and maintenance of the seat.

[0019] 5. The torsion spring of the present invention has pre-stress. When installed, the torsion spring is compressed by the force of the second limit block to prevent loosening and the noise caused by it. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional schematic diagram of the present invention.

[0021] Figure 2 yes Figure 1 A partial enlarged view of .

[0022] Figure 3 It is a three-dimensional schematic diagram of the housing of the present invention.

[0023] Figure 4 It is a cross-sectional view of the housing of the present invention.

[0024] Figure 5 It is a three-dimensional schematic diagram of the seat leg fixing structure of the present invention with the shell removed.

[0025] Figure 6 It is a cross-sectional view of the seat leg fixing structure of the present invention.

[0026] Figure 7 yes Figure 6 AA magnified image.

[0027] Figure 8 yes Figure 6 BB-direction enlarged view. DETAILED DESCRIPTION

[0028] The present invention will be further described below with reference to specific embodiments of the present invention. Figures 1-8 :

[0029] A seat front and rear adjustment mechanism includes a slide rail 01 and a seat leg fixing structure 02 slidably mounted on the slide rail 01. The slide rail 01 is provided with a T-slot 12 on the upper surface of a base plate 10 along the length direction. The T-slot 12 of the base plate 10 has arcuate grooves 11 symmetrically and spaced apart on the opposite side walls. The seat leg fixing structure 02 includes a shell 20. The front and / or rear sides of the shell 20 are mounted with a first limit block 30 that can slide on the T-slot 12 and limit the vertical movement of the shell 20 through a mounting plate. The middle portion is provided with a stop block 30 that can be snapped onto the arcuate groove 11 to limit the front and rear movement of the shell 20. The second limit block 40 is provided, and a torsion spring 36 is hingedly connected to the shell 20 between the first limit block 30 and the second limit block 40 through a pin or a screw 34. The two ends of the torsion spring 36 are respectively positioned on the first limit block 30 and the second limit block 40. The upward movement of the pull rod 46 provided on the shell 20 drives the second limit block 40 to move upward through the pin shaft 45 to disengage from the arc groove 11. The second limit block 40 simultaneously drives the torsion spring 36 to rotate and presses the first limit block 30 downward so that a gap appears between the first limit block 30 and the upper wall of the T-slot 12, which can enable the shell 20 to move forward and backward.

[0030] As a further optimization of the above technical solution, the front side and / or rear side of the shell 20 is provided with a mounting plate 21 extending toward the front side and / or rear side, and the lower two sides of the first limit block 30 are respectively provided with limit arms 31 extending into the T-slot 12, and the middle is provided with a first groove 32. The mounting plate 21 extends into the first groove 32, and the first limit block 30 is slid and fixed on the shell 20 by a screw 37 passing through the upper arm plate 35 of the first groove 32, the first groove 32, the mounting plate 21 and the bottom wall of the first groove 32. A first return spring 33 is mounted on the screw 37 between the upper arm plate 35 of the first groove 32 and the mounting plate 21.

[0031] As a further optimization of the above technical solution, the second limit block 40 includes a cylinder 41 whose front and rear sides can respectively match the arc groove 11 and can be inserted into the arc groove 11. The front and rear cylinders 41 are connected by a connecting block 43 in the middle. The connecting block 43 is fixed with the pull rod 46 by a pin 45 or a bolt. The pull rod 46 passes through the first through hole 23 in the middle of the shell 20 and extends out of the shell 20. The middle and lower parts of the first through hole 23 are expanded to form a spring chamber 26. One end of the second return spring 44 mounted on the pull rod 46 in the spring chamber 26 is connected to the upper wall of the spring chamber 26, and the other end is connected to the upper surface of the connecting block 43.

[0032] As a further optimization of the above technical solution, a vertical through hole 42 for weight reduction is provided in the middle of the cylinder 41 .

[0033] As a further optimization of the above technical solution, the arcuate surfaces on the left and right sides of the cylinder 41 match the arcuate surfaces of the arcuate groove 11 .

[0034] As a further optimization of the above technical solution, a connecting joint 48 is fixed to the pull rod 46 extending out of the shell 20, and the lower end surface of the connecting joint 48 abuts against the upper surface of the shell 20 to limit the downward extension length of the second limit block 40.

[0035] As a further optimization of the above technical solution, a wire terminal mounting hole 47 is provided on the connecting block 43 .

[0036] As a further optimization of the above technical solution, two or more seat leg mounting holes 24 are spaced apart on the shell 20 .

[0037] As a further optimization of the above technical solution, the lower surface of the shell 20 is provided with a second groove 22 connected front to back for the first limit block 30 and the second limit block 40 to move up and down, and the first limit block 30 and the second limit block 40 are provided with torsion spring abutment positions 38 and 49 on the opposite sides thereof. The torsion spring 36 is hinged in the second groove 22 between the first limit block 30 and the second limit block 40 through a pin or a screw 34, and one end of the torsion spring 36 abuts against the torsion spring abutment position 38 of the first limit block 30, and the other end abuts against the torsion spring abutment position 49 of the second limit block 40.

[0038] When the present invention is used, the seat leg is installed on the mounting hole 24 of the shell 20 with a bolt, and the second limit block 40 is pulled upward by the pull wire installed on the pull wire terminal mounting hole 47 to disengage the arc groove 11 of the slide rail 01, thereby unlocking the second limit block 40. While the second limit block 40 is unlocked, the torsion spring simultaneously drives the first limit block downward, and also disengages the contact with the upper surface in the T-shaped groove 12 to unlock; the pull wire terminal is released, and the second limit block 40 moves downward into the arc groove 11 of the slide rail 01 under the action of the return elastic force of the second return spring 44, so that the second limit block 40 is locked. At the same time, the force of the torsion spring is released, and under the action of the return elastic force of the first return spring 33, the limit arm 31 of the first limit block 30 moves upward and contacts the upper wall in the T-shaped groove 12. The downward unlocking of the first limit block is to completely avoid the occurrence of friction and prevent the sliding situation; the upward locking of the first limit block is to prevent the entire seat from sliding upward out of the slide rail when locked, causing danger.

[0039] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still make simple replacements or modifications of similar technologies to the technical solutions or technical features described in the aforementioned embodiments, and these simple replacements or modifications do not deviate the essence of the corresponding technical solutions from the spirit and essence of the technical solutions of the various embodiments of the present invention, and they are still within the scope of protection of the present invention.

Claims

1. A seat fore-aft adjustment mechanism, comprising a slide rail and a seat leg fixing structure slidably mounted on the slide rail, characterized in that: The slide rail is provided with a T-shaped groove along the length direction on the upper surface of the base plate, and arc grooves are symmetrically and spaced apart on the opposite side walls of the T-shaped groove of the base plate. The seat leg fixing structure includes a shell, the front side and / or the rear side of the shell are provided with a first limit block that can slide on the T-shaped groove and limit the vertical movement of the shell, and the middle part is provided with a second limit block that can be clamped on the arc groove to limit the forward and backward movement of the shell. A torsion spring is hinged on the shell between the first limit block and the second limit block through a screw, and the two ends of the torsion spring are respectively positioned on the first limit block and the second limit block. The upward movement of the pull rod provided on the shell drives the second limit block to move upward to disengage from the arc groove. The second limit block simultaneously drives the torsion spring to rotate and presses the first limit block downward so that a gap appears between the first limit block and the upper wall of the T-shaped groove, which can enable the shell to move forward and backward.

2. A seat front and rear adjustment mechanism according to claim 1, characterized in that: The front side and / or rear side of the shell is provided with a mounting plate extending to the front side and / or rear side, and the lower two sides of the first limit block are respectively provided with limit arms extending into the T-slot, and the middle is provided with a first groove, and the mounting plate extends into the first groove, and the first limit block is slidably fixed to the shell by a screw passing through the upper arm plate of the first groove, the first groove, the mounting plate and the bottom wall of the first groove, and a first return spring is mounted on the screw between the upper arm plate of the first groove and the mounting plate.

3. The seat front and rear adjustment mechanism according to claim 1, characterized in that: The second limit block includes a cylinder whose front and rear sides can respectively match the arc groove and can be inserted into the arc groove. The front and rear cylinders are connected by a connecting block in the middle. The connecting block is fixed with the pull rod by a pin or bolt. The pull rod passes through the first through hole in the middle of the shell and extends out of the shell. The middle and lower parts of the first through hole are expanded to form a spring chamber. One end of the second return spring mounted on the pull rod in the spring chamber is connected to the upper wall of the spring chamber, and the other end is connected to the upper surface of the connecting block.

4. The seat front-rear adjustment mechanism according to claim 3, characterized in that: A vertical weight-reducing through hole is provided in the middle of the cylinder.

5. The seat front-rear adjustment mechanism according to claim 3, characterized in that: The arcuate surfaces on the left and right sides of the cylinder match the arcuate surfaces of the arcuate groove.

6. The seat front and rear adjustment mechanism according to claim 1, characterized in that: A connecting joint is fixed on the pull rod extending out of the shell, and the lower end surface of the connecting joint is in contact with the upper surface of the shell to limit the downward extension length of the second limiting block.

7. The seat front-rear adjustment mechanism according to claim 3, characterized in that: The connecting block is provided with a wire terminal mounting hole.

8. The seat front-rear adjustment mechanism according to claim 1, characterized in that: The shell is provided with two or more seat leg mounting holes at intervals.

9. A seat fore-aft adjustment mechanism according to any one of claims 1 to 8, characterized in that: The lower surface of the shell is provided with a second groove connected front to back for the first limit block and the second limit block to move up and down. The first limit block and the second limit block are provided with torsion spring abutment positions on the opposite sides. The torsion spring is hinged in the second groove between the first limit block and the second limit block through a screw. One end of the torsion spring abuts against the torsion spring abutment position of the first limit block, and the other end abuts against the torsion spring abutment position of the second limit block.

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