A high-safety seesaw

Abstract

The application belongs to the technical field of sports goods, and particularly relates to a seesaw with high safety, which aims at the problem that when the weight difference between two sides of the seesaw is too large, the light side of the seesaw is quickly lifted up, thereby causing collision and falling risk when the seesaw is out of control and rises up, and the following scheme is proposed, which comprises: a supporting bottom plate, two tool supporting legs are symmetrically arranged on one side of the supporting bottom plate; a dynamic balance module arranged above the supporting bottom plate, the dynamic balance module is used for automatically adjusting the gravity center position of the seesaw to avoid the light side from being quickly lifted up; and a stable module arranged on both sides of the supporting bottom plate, the stable module is used for buffering and protecting the two sides of the seesaw. The seesaw with high safety has the effect that the dynamic balance module is used for automatically adjusting the gravity center position when the weight difference between the two sides is large, the light side is prevented from being quickly lifted up, and the problem of the rapid rising and falling risk of the traditional seesaw caused by imbalance is solved.

Description

Technical Field

[0001] This invention relates to the field of sports and leisure products technology, and in particular to a seesaw with high safety. Background Technology

[0002] A seesaw is a children's toy for two people. One person sits at each end, going up while the other goes down. The seesaw works on the principle of leverage; the pressure exerted by the person on the seesaw is the effort arm and the resistance arm, respectively. The downward acceleration causes the seesaw to move up and down; the downward acceleration of the higher seesaw is greater than that of the lower seesaw, so the higher seesaw falls, and simultaneously, due to the leverage principle, it lifts the lower seesaw up, thus creating a cycle.

[0003] In the use of existing seesaw devices, if the weight difference between the two sides is too large, the lighter side of the seesaw will rise rapidly, which will increase the risk of collision and fall when it rises out of control. Summary of the Invention

[0004] This invention discloses a highly safe seesaw, aiming to solve the technical problem in the prior art where, if the weight difference between the two sides is too large, the lighter side of the seesaw will rise rapidly, leading to an uncontrolled rise and the risk of collision and fall.

[0005] The present invention proposes a highly safe seesaw, comprising: A supporting base plate, wherein two tooling legs are symmetrically arranged on one side of the supporting base plate; A dynamic balancing module is installed above the support base plate. The dynamic balancing module is used to automatically adjust the center of gravity of the seesaw to avoid rapid upward tilting. The stabilizing modules are located on both sides of the supporting base plate. The stabilizing modules provide two-stage buffer protection for the seesaw, gradually reducing the downward pressure and preventing impact to the ground.

[0006] In a preferred embodiment, the dynamic balancing module includes: The limiting guide frame is fixedly connected to one side of the supporting base plate. The lifting fixture seat is slidably connected inside the limiting guide frame. Two mounting plates are fixedly connected to one side of the lifting fixture seat. Each of the two mounting plates has a mounting opening on one side. The same dynamic balance wheel is connected inside the two mounting openings through bearings. A horizontal buffer spring is fixedly connected to one side of the support base plate on one side and to one side of the lifting fixture on the other side. The horizontal buffer spring is located inside the limit guide frame.

[0007] In a preferred embodiment, the dynamic balancing module further includes: The rotating shaft is connected to the limiting guide frame via bearings. An angled balance seat is fixedly connected to the outside of the rotating shaft. The two sides of the angled balance seat abut against the outside of the dynamic balance wheel. The crossbeam is fixedly connected to one side of the included angle balance seat. Two balance sleeves are slidably connected to the outside of the crossbeam. Compression springs are distributed in a ring at equal intervals inside the two balance sleeves. The same U-shaped tool rod is fixedly connected to one side of the multiple compression springs located on the same side. The two sides of the multiple U-shaped tool rods are provided with circular holes at equal intervals. The interiors of the two opposite circular holes are connected to the same roller through bearings.

[0008] In a preferred embodiment, the dynamic balancing module further includes: Two counterweights are fixedly connected to the outside of two balance sleeves, and tooling plates are fixedly connected to the outside of both balance sleeves. The U-shaped linkage frame is fixedly connected to the outside of the rotating shaft. A tooling mounting frame is fixedly connected to one side of the U-shaped linkage frame. Two round holes are opened on both sides of the tooling mounting frame. The two opposite round holes are connected to the same rotating cylinder through bearings. Limiting sleeves are fixedly connected to the outside of the two rotating cylinders. In a preferred embodiment, the dynamic balancing module further includes: The indicator rod is fixedly connected to the outside of the rotating shaft. Two round holes are opened on both sides of the tooling mounting frame. The inside of the two opposing round holes is connected to the same winding cylinder through bearings. The outside of the two winding cylinders is fixedly connected to a winding frame. Two universal motors are set on one side of the tooling mounting frame. The winding and unwinding ends of the universal motors are connected to one side of the winding cylinder via couplings. The inside of both winding frames is wound with winding and unwinding ropes. One end of the winding and unwinding rope passes through the limiting sleeve and is fixedly connected to one side of the tooling plate. Two telescopic springs are fixedly connected to the opposite side of the U-shaped linkage frame and the tooling plate.

[0009] In a preferred embodiment, the stabilization module includes: Two seats are symmetrically and fixedly connected to both ends of the crossbeam; Multiple rotating rods are connected to the bottom of the seat via bearings. One of the rotating rods is fixedly connected to a downward support arm, and a horizontal cylinder is fixedly connected to one side of the downward support arm.

[0010] In a preferred embodiment, the stabilization module further includes: Rotating block one is movably connected to the outside of the horizontal cylinder, and rotating block two is movably connected to the outside of one of the rotating rods. A damping slide rod and a damping movable sleeve are fixedly connected to one side of rotating block one and rotating block two respectively, and the damping slide rod is slidably connected to the inside of the damping movable sleeve. The damping spring has one side fixedly connected to one side of the damping slide rod, and the other side fixedly connected to one side of the damping movable sleeve. The damping spring is located inside the damping movable sleeve.

[0011] In a preferred embodiment, the stabilization module further includes: Two tooling limit plates are fixedly connected to the outside of the horizontal cylinder, and the same limit track is fixedly connected to the opposite side of the two tooling limit plates. Two guide cylinders are fixedly connected inside the grooves of two limit rails. Two buffer sliders are slidably connected to the outside of each guide cylinder. The same counteracting spring is fixedly connected to the opposite side of the two buffer sliders on the same side.

[0012] In a preferred embodiment, the stabilization module further includes: Multiple movable pressure rods are connected to one side of multiple buffer sliders via bearings, and one end of each movable pressure rod is connected to a movable block via a bearing; The movable slide frame has four round holes at equal intervals on both sides, and the interior of each of the two opposite round holes is connected to the same rubber roller through a bearing.

[0013] In a preferred embodiment, the crossbeam is externally and symmetrically fixedly connected to two double-handle armrests.

[0014] As can be seen from the above, the seesaw with high safety provided by the present invention has the beneficial effect of automatically adjusting the center of gravity position when the weights of the two sides are significantly different through the dynamic balancing module, avoiding rapid lifting on the lighter side, and solving the risk of rapid rise and fall caused by imbalance in traditional seesaws. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the main structure of the present invention; Figure 2 This is a schematic diagram of the dynamic balancing module structure of the present invention; Figure 3 This is a schematic diagram of the dynamic balancing module structure of the present invention; Figure 4 This is a schematic diagram of the balancing slip sleeve structure of the present invention; Figure 5 This is a schematic diagram of the stable module structure of the present invention; Figure 6 This is a schematic diagram of the stabilizing module structure of the present invention; Figure 7 This is a schematic diagram of the canceling spring structure of the present invention.

[0016] In the diagram: 1. Support base plate; 2. Tooling support leg; 3. Dynamic balancing module; 301. Limiting guide frame; 302. Horizontal buffer spring; 303. Lifting tooling seat; 304. Mounting plate; 305. Dynamic balancing wheel; 306. Rotating shaft; 307. Angle balancing seat; 308. U-shaped linkage frame; 309. Tooling mounting frame; 310. Rewinding cylinder; 311. Rewinding frame; 312. Rotating cylinder; 313. Limiting sleeve; 314. General motor; 315. Rope winding / unwinding; 316. Telescopic spring; 317. Balancing sleeve; 318. Tooling plate; 319. Balancing counterweight; 320. Indicator. 321. Benchmark; 322. Compression spring; 323. U-shaped tooling rod; 324. Roller; 4. Crossbeam; 5. Seat; 6. Stabilizing module; 601. Rotating round rod; 602. Downward support arm; 603. Horizontal cylinder; 604. Tooling limit plate; 605. Rotating block one; 606. Rotating block two; 607. Damping movable sleeve; 608. Damping slide rod; 609. Limiting rail; 610. Damping spring; 611. Moving slide frame; 612. Rubber roller; 613. Buffer slider; 614. Guide cylinder; 615. Counteracting spring; 616. Movable downward pressure rod; 617. Movable block; 7. Double handle armrest. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0018] The present invention discloses a highly safe seesaw, which is mainly used in scenarios where the weight difference between the two sides is too large, and the lighter side of the seesaw will rise rapidly, resulting in a risk of collision and fall when it rises out of control.

[0019] Reference Figures 1-7 A highly safe seesaw includes: A base plate 1 is provided, and two tooling legs 2 are symmetrically arranged on one side of the base plate 1. The dynamic balancing module 3 is located above the support base plate 1. The dynamic balancing module 3 is used to automatically adjust the center of gravity of the seesaw to avoid sudden upward movement due to slight tilting. The stabilizing module 6 is located on both sides of the supporting base plate 1. The stabilizing module 6 provides two-stage buffer protection for the seesaw, gradually reducing the downward pressure and preventing impact to the ground.

[0020] Reference Figures 1-4 In a preferred embodiment, the dynamic balancing module 3 includes: The limiting guide frame 301 is fixedly connected to one side of the support base plate 1. The lifting fixture seat 303 is slidably connected inside the limiting guide frame 301. Two mounting plates 304 are fixedly connected to one side of the lifting fixture seat 303. Each of the two mounting plates 304 has a mounting opening on one side. The same dynamic balance wheel 305 is connected inside the two mounting openings through bearings. A horizontal buffer spring 302 is fixedly connected to one side of the support base plate 1 on one side and to one side of the lifting fixture seat 303 on the other side. The horizontal buffer spring 302 is located inside the limit guide frame 301.

[0021] In this invention, the dynamic balancing module 3 further includes: The rotating shaft 306 is connected to the limiting guide frame 301 via bearings. An angled balance seat 307 is fixedly connected to the outside of the rotating shaft 306. The two sides of the angled balance seat 307 abut against the outside of the dynamic balance wheel 305 respectively. The crossbeam 4 is fixedly connected to one side of the included angle balance seat 307. Two balance sleeves 317 are slidably connected to the outside of the crossbeam 4. Compression springs 321 are distributed in a ring at equal intervals inside the two balance sleeves 317. The same U-shaped tooling rod 322 is fixedly connected to one side of the multiple compression springs 321 located on the same side. The two U-shaped tooling rods 322 have round holes 1 at equal intervals on both sides. The inside of the two opposite round holes 1 is connected to the same roller 323 through bearings.

[0022] In this invention, the dynamic balancing module 3 further includes: Two counterweights 319 are fixedly connected to the outside of two balance sleeves 317 respectively, and tooling plates 318 are fixedly connected to the outside of both balance sleeves 317. The U-shaped linkage frame 308 is fixedly connected to the outside of the rotating shaft 306. A tooling mounting frame 309 is fixedly connected to one side of the U-shaped linkage frame 308. Two round holes are opened on both sides of the tooling mounting frame 309. The two opposing round holes are connected to the same rotating cylinder 312 through bearings. Limiting sleeves 313 are fixedly connected to the outside of the two rotating cylinders 312. In this invention, the dynamic balancing module 3 further includes: The indicator rod 320 is fixedly connected to the outside of the rotating shaft 306. Two round holes 3 are opened on both sides of the tooling mounting frame 309. The inside of the two opposing round holes 3 is connected to the same winding cylinder 310 through bearings. The outside of the two winding cylinders 310 is fixedly connected to the winding frame 311. Two general-purpose motors 314 are set on one side of the tooling mounting frame 309. The winding and unwinding ends of the general-purpose motors 314 are connected to one side of the winding cylinder 310 via a coupling. The inside of the two winding frames 311 is wound with winding and unwinding ropes 315. One end of the winding and unwinding ropes 315 passes through the limiting sleeve 313 and is fixedly connected to one side of the tooling plate 318. Two telescopic springs 316 are fixedly connected to the opposite side of the U-shaped linkage frame 308 and the tooling plate 318.

[0023] In a specific application scenario, the user sits on the seats 5 on both sides, holding the double-handle armrests 7 with both hands. The indicator rod 320 of the dynamic balance module 3 is in a vertical position, and the balance weights 319 on both sides are symmetrically distributed at the center of the crossbeam 4. When the left side sinks, the crossbeam 4 drives the rotating shaft 306 to rotate counterclockwise, the indicator rod 320 tilts, the angled balance seat 307 presses the dynamic balance wheel 305, and pushes the lifting fixture seat 303 to compress the horizontal buffer spring 302, absorbing the initial impact and reducing the shaking of the support base plate 1. The rotating shaft 306 drives the U-shaped linkage frame 308 to deflect, triggering the right-side general motor 3. 14. Release the retractable rope 315, extend the right telescopic spring 316, pull the tooling plate 318 to drive the counterweight block 319 to slide to the right along the crossbeam 4, increase the counterweight on the lighter side. The retractable rope 315 is guided by the limiting sleeve 313 to ensure the stability of the moving trajectory of the tooling plate 318. After the counterweight block moves to the new balance point, the crossbeam 4 tends to be horizontal, the indicator rod 320 returns to the center, and the general motor 314 stops working. When the weights of the two are significantly different, the dynamic balance module 3 automatically adjusts the center of gravity position to avoid the lighter side from rising rapidly, thus solving the risk of rapid rise and fall caused by imbalance in traditional seesaws.

[0024] Reference Figure 1 , Figure 5 , Figure 6 and Figure 7 In a preferred embodiment, the stabilizing module 6 includes: Two seats 5 are symmetrically and fixedly connected to both ends of the crossbeam 4; Multiple rotating rods 601 are connected to the bottom of the seat 5 via bearings. One of the rotating rods 601 is externally fixedly connected to a downward support arm 602, and a horizontal cylinder 603 is fixedly connected to one side of the downward support arm 602.

[0025] In this invention, the stabilizing module 6 further includes: Rotating block 1 605 is movably connected to the outside of the horizontal cylinder 603, and rotating block 2 606 is movably connected to the outside of one of the rotating rods 601. A damping slide rod 608 and a damping movable sleeve 607 are respectively fixedly connected to one side of rotating block 1 605 and rotating block 2 606. The damping slide rod 608 is slidably connected to the inside of the damping movable sleeve 607. The damping spring 610 has one side fixedly connected to one side of the damping slide rod 608, and the other side fixedly connected to one side of the damping movable sleeve 607. The damping spring 610 is located inside the damping movable sleeve 607.

[0026] In this invention, the stabilizing module 6 further includes: Two tooling limit plates 604 are fixedly connected to the outside of the horizontal cylinder 603, and the same limit rail 609 is fixedly connected to the opposite side of the two tooling limit plates 604. Two guide cylinders 614 are fixedly connected inside the grooves of two limit rails 609. Two buffer sliders 613 are slidably connected to the outside of the two guide cylinders 614. The same counteracting spring 615 is fixedly connected to the opposite side of the two buffer sliders 613 located on the same side.

[0027] In this invention, the stabilizing module 6 further includes: Multiple movable pressure rods 616 are connected to one side of multiple buffer sliders 613 via bearings, and one end of each movable pressure rod 616 is connected to a movable block 617 via a bearing. The movable slide frame 611 has four round holes at equal intervals on both sides, and the two opposite round holes are connected to the same rubber roller 612 through bearings.

[0028] In a specific application scenario, when the heavier side of the seat 5 sinks, the downward support arm 602 pushes the horizontal cylinder 603 downward. The rotating block 605 drives the damping slide rod 608 to slide within the damping movable sleeve 607, compressing the damping spring 610 and consuming some kinetic energy. The horizontal cylinder 603 presses down on the limiting track 609, pushing the buffer slider 613 to slide along the guide cylinder 614 and squeeze the counteracting spring 615. The movable downward pressure rod 616 hinges to the movable block 617 to push the moving slide frame 611, causing the rubber roller 612 to contact the ground. Through elastic deformation, it further absorbs the remaining impact force. When the pressure is released, the damping spring 610 and the counteracting spring 615 release their stored energy, pushing each component back to its position, ready for the next buffering. The stabilizing module 6 forms a two-stage buffer protection, attenuating the downward pressure in stages, avoiding impact to the ground, and making the device move smoothly.

[0029] Reference Figure 1 and Figure 2 In a preferred embodiment, the crossbeam 4 is externally and symmetrically fixedly connected to two double-handle armrests 7.

[0030] Working principle: When using, The user sits on either side of the seats 5, holding the double-handle armrests 7. The indicator rod 320 of the dynamic balance module 3 is in a vertical position. The balance weights 319 on both sides are symmetrically distributed at the center of the crossbeam 4. When the left side sinks, the crossbeam 4 drives the rotating shaft 306 to rotate counterclockwise, the indicator rod 320 tilts, the angled balance seat 307 presses against the dynamic balance wheel 305, and pushes the lifting fixture seat 303 to compress the horizontal buffer spring 302, absorbing the initial impact and reducing the swaying of the support base plate 1. 306 drives the U-shaped linkage frame 308 to deflect, triggering the right-side general motor 314 to release the take-up and release rope 315. The right-side telescopic spring 316 extends, pulling the tooling plate 318 to drive the counterweight block 319 to slide to the right along the crossbeam 4, increasing the counterweight on the lighter side. The take-up and release rope 315 is guided by the limit sleeve 313 to ensure the stability of the tooling plate 318's movement trajectory. After the counterweight block moves to the new balance point, the crossbeam 4 tends to be horizontal, the indicator rod 320 returns to center, and the general motor 314 stops working. When the heavier side of the seat 5 sinks, the downward support arm 602 pushes the horizontal cylinder 603 downward. The rotating block 605 drives the damping slide rod 608 to slide within the damping movable sleeve 607, compressing the damping spring 610 and consuming some kinetic energy. The horizontal cylinder 603 presses down on the limiting track 609, pushing the buffer slider 613 to slide along the guide cylinder 614 and squeeze the counteracting spring 615. The movable downward pressure rod 616 hinges to the movable block 617, pushing the moving slide frame 611 so that the rubber roller 612 contacts the ground. Through elastic deformation, it further absorbs the remaining impact force. When the pressure is released, the damping spring 610 and the counteracting spring 615 release their stored energy, pushing all components back to their positions, ready for the next buffering.

[0031] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A highly safe seesaw, characterized in that, include: A support base plate (1) is provided, and two tooling legs (2) are symmetrically arranged on one side of the support base plate (1). A dynamic balancing module (3) is set above the support base plate (1). The dynamic balancing module (3) is used to automatically adjust the center of gravity of the seesaw to avoid rapid upward movement on one side. The dynamic balancing module (3) includes: The limiting guide frame (301) is fixedly connected to one side of the supporting base plate (1). The limiting guide frame (301) is slidably connected to the lifting fixture seat (303). Two mounting plates (304) are fixedly connected to one side of the lifting fixture seat (303). Each of the two mounting plates (304) has a mounting opening on one side. The two mounting openings are connected to the same dynamic balance wheel (305) through bearings. A horizontal buffer spring (302) is fixedly connected to one side of the support base plate (1) on one side and to one side of the lifting fixture seat (303) on the other side. The horizontal buffer spring (302) is located inside the limit guide frame (301). The rotating shaft (306) is connected to the limiting guide frame (301) via a bearing. An angled balance seat (307) is fixedly connected to the outside of the rotating shaft (306). The two sides of the angled balance seat (307) abut against the outside of the dynamic balance wheel (305). The crossbeam (4) is fixedly connected to one side of the included angle balance seat (307), and the outside of the crossbeam (4) is slidably connected to two balance sleeves (317). Two counterweights (319) are fixedly connected to the outside of two balance sleeves (317), and tooling plates (318) are fixedly connected to the outside of both balance sleeves (317). The U-shaped linkage frame (308) is fixedly connected to the outside of the rotating shaft (306). A tooling mounting frame (309) is fixedly connected to one side of the U-shaped linkage frame (308). Two round holes are opened on both sides of the tooling mounting frame (309). The interior of the two opposite round holes is connected to the same rotating cylinder (312) through a bearing. Limiting sleeves (313) are fixedly connected to the outside of the two rotating cylinders (312). Two circular holes are provided on both sides of the tooling mounting frame (309). The two opposite circular holes are connected to the same winding cylinder (310) through bearings. The two winding cylinders (310) are fixedly connected to the outside of the winding frame (311). Two general-purpose motors (314) are set on one side of the tooling mounting frame (309). The winding and unwinding ends of the general-purpose motors (314) are connected to one side of the winding cylinder (310) via a coupling. The inside of the two winding frames (311) is wound with winding and unwinding ropes (315). One end of the winding and unwinding ropes (315) passes through the limiting sleeve (313) and is fixedly connected to one side of the tooling plate (318). Two telescopic springs (316) are fixedly connected to the opposite side of the U-shaped linkage frame (308) and the tooling plate (318). The stabilizing module (6) is set on both sides of the supporting base plate (1). The stabilizing module (6) provides two-stage buffer protection for the seesaw and reduces the downward pressure in stages.

2. The seesaw with high safety according to claim 1, characterized in that, The dynamic balancing module (3) also includes: Inside the two balancing sleeves (317), compression springs (321) are distributed in a ring at equal intervals. On one side of the multiple compression springs (321) located on the same side, the same U-shaped tooling rod (322) is fixedly connected. On both sides of the multiple U-shaped tooling rods (322), there are circular holes I at equal intervals. The interiors of the two opposite circular holes I are connected to the same roller (323) through bearings.

3. A highly safe seesaw according to claim 2, characterized in that, The dynamic balancing module (3) also includes: The indicator rod (320) is fixedly connected to the outside of the rotating shaft (306).

4. A highly safe seesaw according to claim 3, characterized in that, The stabilizing module (6) includes: Two seats (5) are symmetrically fixed to both ends of the crossbeam (4); Multiple rotating rods (601) are connected to the bottom of the seat (5) via bearings. One of the rotating rods (601) is fixedly connected to a downward support arm (602), and a horizontal cylinder (603) is fixedly connected to one side of the downward support arm (602).

5. A highly safe seesaw according to claim 4, characterized in that, The stabilization module (6) also includes: Rotating block one (605) is movably connected to the outside of the horizontal cylinder (603), and rotating block two (606) is movably connected to the outside of one of the rotating rods (601). A damping slide rod (608) and a damping movable sleeve (607) are respectively fixedly connected to one side of rotating block one (605) and rotating block two (606). The damping slide rod (608) is slidably connected to the inside of the damping movable sleeve (607).

6. A highly safe seesaw according to claim 5, characterized in that, The stabilization module (6) also includes: The damping spring (610) has one side fixedly connected to one side of the damping slide rod (608) and the other side fixedly connected to one side of the damping movable sleeve (607). The damping spring (610) is located inside the damping movable sleeve (607).

7. A highly safe seesaw according to claim 6, characterized in that, The stabilization module (6) also includes: Two tooling limit plates (604) are fixedly connected to the outside of the horizontal cylinder (603), and the same limit rail (609) is fixedly connected to the opposite side of the two tooling limit plates (604). Two guide cylinders (614) are fixedly connected inside the grooves of two limit rails (609). Two buffer sliders (613) are slidably connected to the outside of the two guide cylinders (614). The same counteracting spring (615) is fixedly connected to the opposite side of the two buffer sliders (613) located on the same side.

8. A highly safe seesaw according to claim 7, characterized in that, The stabilization module (6) also includes: Multiple movable pressure rods (616) are connected to one side of multiple buffer sliders (613) via bearings, and one end of each movable pressure rod (616) is connected to a movable block (617) via a bearing. The movable slide frame (611) has four round holes at equal intervals on both sides, and the two opposite round holes are connected to the same rubber roller (612) through bearings.

9. A highly safe seesaw according to claim 8, characterized in that, The crossbeam (4) is externally and symmetrically fixedly connected to two double-handle armrests (7).

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