A stroller base that can climb stairs

Abstract

The application relates to a stair-climbable bassinet base in the field of bassinets. The stair-climbable bassinet base comprises a vehicle base, a door-shaped handrail hinged to the two sides of the vehicle base at two ends, front wheels connected to the two sides of one end of the vehicle base, brake rods extending along the width direction of the vehicle base arranged at the two sides of the other end of the vehicle base, fixing sleeves rotatably sleeved on the brake rods, and wheel carrier plates, each wheel carrier plate being connected with at least three rotatable rear wheels, the rear wheels being arranged along the circumferential direction of the corresponding wheel carrier plate, rotary rods hinged to the bottom of the two ends of the door-shaped handrail, L-shaped cranks hinged to the two sides of the vehicle base, one end of each crank being hinged to the corresponding rotary rod, and the other end of each crank being connected with the corresponding fixing sleeve; when the door-shaped handrail rotates from a preset angle with the vehicle base to parallel to the vehicle base, the two brake rods rotate from being flush with the vehicle base to being below the vehicle base. The stair-climbable bassinet base can conveniently help the user to smoothly drag the bassinet up and down the stairs.

Description

Technical Field

[0001] This application relates to the field of cradles, and more specifically, to a cradle base with a climbing staircase. Background Technology

[0002] A cradle stroller is a tool used to carry infants and toddlers and to rock them to help them sleep. Therefore, cradle strollers are often used outdoors instead of strollers without a cradle function. However, in some families living in apartment buildings without elevators, going up and down stairs requires carrying the baby in one arm and dragging the stroller with the other, which is extremely inconvenient, increases the burden on the user, and poses a significant safety hazard. Summary of the Invention

[0003] The purpose of this application is to provide a cradle base that can climb stairs, which allows users to easily and smoothly move up and down stairs.

[0004] The embodiments of this application are implemented as follows:

[0005] This application provides a cradle base with a climbing staircase, comprising a vehicle base and gate-shaped handrails hinged to both sides of the vehicle base at both ends. Front wheels are connected to both sides of one end of the vehicle base, and brake levers extending along their width are provided on both sides of the other end of the vehicle base. Fixing sleeves and wheel frames are rotatably mounted on the corresponding brake levers in sequence. Each wheel frame is connected to at least three rotatable rear wheels, which are spaced apart circumferentially along the corresponding wheel frame. Rotating rods are hinged to the bottom of both ends of the gate-shaped handrails. Two L-shaped cranks are hinged to both sides of the vehicle base, with one end of each crank hinged to a corresponding rotating rod and the other end connected to a corresponding fixing sleeve. When the gate-shaped handrails rotate from a preset angle with the vehicle base to parallel, the two brake levers rotate from being flush with the vehicle base to being located below the vehicle base.

[0006] In some alternative implementations, the vehicle base has handrail mounting brackets connected to both sides of the top of the front wheel end. When the portal armrest is rotated to be parallel to the vehicle base, the handrail mounting brackets can be selectively connected to or separated from the portal armrest.

[0007] In some alternative implementations, the handrail mounting brackets are respectively connected to pins that can move axially, and the two ends of the portal handrail are respectively provided with pin holes. When the portal handrail is rotated to be parallel to the vehicle base, the pins move axially to insert into or disengage from the corresponding pin holes.

[0008] In some alternative implementations, at least one brake lever is connected to a brake pad and a brake assembly, and when the brake lever rotates, it drives the corresponding wheel hub disc and each rear wheel to lock or unlock synchronously via the brake assembly.

[0009] In some optional embodiments, the brake assembly includes a brake positioning seat and a brake movable disc slidably sleeved on the brake lever, the brake positioning seat being connected to a fixed sleeve; when the brake positioning seat rotates relative to the brake movable disc, it pushes the brake movable disc to move axially and press against the side of the corresponding wheel frame disc, the brake movable disc having at least one locking hole; the wheel frame disc is connected to wheel frame locking pins corresponding to the locking holes one by one, the wheel frame disc is also connected to rear wheel locking pins and torsion springs corresponding to the rear wheels one by one, the torsion springs are configured to push the rear wheel locking pins to move and press against the corresponding rear wheels when rotated, a first return spring for driving the rear wheel locking pins to return to their original position is also provided between the rear wheel locking pins and the wheel frame disc; when the brake movable disc presses against the side of the wheel frame disc, it pushes each torsion spring to rotate and causes each wheel frame locking pin to insert into the corresponding locking hole; a second return spring is sleeved on the brake lever, with its two ends pressing against the brake movable disc and the corresponding wheel frame disc respectively.

[0010] In some alternative implementations, the outer wall of the brake lever and the inner wall of the brake disc are slidably connected by an axially extending concave-convex structure, and the end faces of the brake positioning seat and the brake disc are slidably connected by at least two circumferentially alternating arc-shaped grooves and arc-shaped blocks.

[0011] In some alternative implementations, the retaining sleeve is equipped with a control lock for connecting or disconnecting it from the corresponding brake lever.

[0012] In some alternative embodiments, the brake lever has a first keyhole, and the fixed sleeve has a second keyhole communicating with the first keyhole. The control lock includes a lock body and a key connected to the fixed sleeve. The lock body has a third keyhole communicating with the second keyhole, a lock cylinder rotatably disposed in the third keyhole, and a bolt that can move along the third keyhole to insert into or disengage from the first and second keyholes. The third keyhole has a bolt spring with its two ends respectively pressing against the bolt and the fixed sleeve. A rotatable lock block is hinged to the outer wall of the bolt. A lock block spring is also connected between the bolt and the lock block. The outer wall of the lock cylinder has a locking groove that engages with the lock block. When the bolt is inserted into the first and second keyholes, the lock cylinder rotates to cause the lock block to engage or disengage from the locking groove. One end of the lock cylinder extends out of the third keyhole and has a keyhole for inserting the key.

[0013] In some alternative embodiments, the brake lever has a first locking hole, and the fixed sleeve has a second locking hole communicating with the first locking hole. The control lock includes a lock body connected to the fixed sleeve. The lock body has a third locking hole communicating with the second locking hole and a latch that can move along the third locking hole to insert into or disengage from the first and second locking holes. The third locking hole has a latch spring with its two ends respectively pressing against the latch and the fixed sleeve. The outer wall of the latch has a protrusion. The lock body also has a fourth locking hole communicating with the third locking hole and a locking pin that can move along the fourth locking hole to press against or disengage from the top of the protrusion. The fourth locking hole has an electromagnet for driving the locking pin to move along the fourth locking hole and a locking pin spring with its two ends respectively pressing against the locking pin and the electromagnet.

[0014] The beneficial effects of this application are as follows: The cradle base with climbable stairs provided by this application includes a vehicle base, gate-shaped handrails hinged to both sides of the vehicle base at both ends, front wheels connected to both sides of one end of the vehicle base, and brake levers extending along their width and fixed sleeves and wheel frame discs rotatably fitted onto the corresponding brake levers on both sides of the other end of the vehicle base. Each wheel frame disc is connected to at least three rotatable rear wheels, which are spaced apart circumferentially along the corresponding wheel frame disc. Rotating rods are hinged to the bottom of both ends of the gate-shaped handrails, and two L-shaped cranks are hinged to both sides of the vehicle base. One end of each crank is hinged to a corresponding rotating rod, and the other end is connected to a corresponding fixed sleeve. When the gate-shaped handrails rotate from a preset angle with the vehicle base to parallel, the two brake levers rotate from being flush with the vehicle base to being located below the vehicle base. The cradle base with climbable stairs provided by this application allows users to easily and smoothly drag it up and down stairs. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 A schematic diagram of the first usage state of the cradle base with climbable stairs provided in an embodiment of this application;

[0017] Figure 2 A schematic diagram of the second usage state of the cradle base with climbable stairs provided in an embodiment of this application;

[0018] Figure 3 An exploded structural diagram of the brake lever, fixing sleeve, brake positioning seat, brake movable disc and wheel frame disc in the base of the cradle with climbable stairs provided in the embodiments of this application;

[0019] Figure 4 A partial cross-sectional view of the connection between the brake lever and the wheel frame disc in the base of the cradle with climbable stairs provided in an embodiment of this application;

[0020] Figure 5 A schematic diagram of the connection structure of the rear wheel locking pin, torsion spring and rear wheel inside the wheel frame disc of the cradle with climbable stairs provided in the embodiments of this application;

[0021] Figure 6 A partial structural diagram of the wheel frame disc facing the brake disc in the base of the cradle with a climbable staircase provided in an embodiment of this application;

[0022] Figure 7 A schematic cross-sectional view of the connection structure of the control lock, fixing sleeve and outer rod sleeve in the base of the cradle with climbable stairs provided in the embodiment of this application;

[0023] Figure 8 A schematic diagram of the locking tongue of the control lock in the base of the cradle with a climbable staircase provided in this application embodiment;

[0024] Figure 9 A schematic diagram of the lock cylinder of the control lock in the base of the cradle with a climbable staircase provided in this embodiment of the application;

[0025] Figure 10 A cross-sectional view of the connection structure of the control lock, fixing sleeve and outer rod sleeve in the base of a cradle with a climbable staircase provided in another embodiment of this application;

[0026] Figure 11 A schematic diagram of the locking tongue in the base of a cradle with a climbable staircase provided in another embodiment of this application.

[0027] In the diagram: 100, vehicle base; 110, door-shaped handrail; 120, front wheel; 130, rear wheel; 140, rotating rod; 150, crank; 160, handrail fixing bracket; 170, first pin; 180, first pin hole; 190, handrail bracket; 210, brake lever; 211, outer rod sleeve; 212, inner rod body; 213, limiting groove; 214, first locking hole; 220, fixing sleeve; 221, second locking hole; 230, wheel frame disc; 240, brake pad; 250, second pin; 260, second pin hole; 300, brake assembly; 310, brake positioning seat; 311, connecting rod; 320, brake movable disc; 321, limiting block; 3 30. Locking hole; 340. Wheel frame locking pin; 341. Wheel frame locking spring; 350. Rear wheel locking pin; 360. Torsion spring; 361. Torsion spring shaft; 362. Torsion spring wheel; 370. First return spring; 380. Second return spring; 390. Arc groove; 391. Arc block; 400. Control lock; 410. Lock body; 420. Key; 430. Third keyhole; 440. Lock cylinder; 450. Lock tongue; 460. Lock tongue spring; 470. Lock block; 471. Lock block spring; 480. Locking groove; 490. Keyhole; 500. Boss; 510. Fourth keyhole; 520. Lock pin; 530. Electromagnet; 540. Lock pin spring. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0030] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0031] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0032] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0033] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0034] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0035] The features and performance of the cradle base with climbable stairs of this application will be further described in detail below with reference to embodiments.

[0036] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 and Figure 11As shown in the figure, this application embodiment provides a cradle base with a climbing staircase, which includes a vehicle base 100 and gate-shaped handrails 110 with both ends hinged to the two sides of the vehicle base 100. Rotatable front wheels 120 are connected to the bottom of both sides of one end of the vehicle base 100. Brake levers 210 extending along their width are provided on both sides of the other end of the vehicle base 100. Each brake lever 210 is rotatably fitted with a fixing sleeve 220 and a wheel frame disc 230. Each wheel frame disc 230 is connected to three rotatable... The three rear wheels 130 are arranged circumferentially around the corresponding wheel frame discs 230, and the rotation axis of the rear wheels 130 is parallel to the axis of the brake lever 210. The top of each side of the vehicle base 100 near the brake lever 210 is provided with a handrail bracket 190. The two ends of a portal armrest 110 are hinged to the two handrail brackets 190 respectively. Rotating rods 140 are hinged to the bottom of each end of the portal armrest 110. Two L-shaped cranks 150 are hinged to each side of the vehicle base 100 near the brake lever 210. One end of each of the two cranks 150 is hinged to a corresponding rotating rod 140, and the other end is connected to a corresponding fixing sleeve 220. When the door-shaped handrail 110 rotates from a preset angle with the vehicle base 100 to parallel, the two brake levers 210 rotate from being flush with the plane of the vehicle base 100 to being below the vehicle base 100. Handrail fixing brackets 160 are connected to the top of the end of the vehicle base 100 where the front wheel 120 is located. Each handrail fixing bracket 160 is connected to a first pin 170 that can move axially. The top of each end of the portal armrest 110 is provided with a first pin hole 180; when the portal armrest 110 is rotated to be parallel to the vehicle base 100, the first pin 170 moves axially to insert or disengage from the corresponding first pin hole 180. The bottom of each end of the portal armrest 110 is provided with a second pin 250, and the two armrest brackets 190 are provided with a second pin hole 260. When the portal armrest 110 is rotated to be arranged at a 70-degree angle with the vehicle base 100, the second pin 250 moves axially to insert or disengage from the corresponding second pin hole 260.

[0037] The brake lever 210 located on one side of the vehicle base 100 is connected to the brake pad 240 and the brake assembly 300. When the brake lever 210 rotates, it drives the corresponding wheel frame disc 230 and each rear wheel 130 to lock or unlock synchronously through the brake assembly 300. Brake assembly 300 includes a brake positioning seat 310 and a brake movable disc 320 slidably sleeved on a brake lever 210. The brake lever 210 comprises an outer rod sleeve 211 and an inner rod body 212, one end of which is slidably inserted into the end of the outer rod sleeve 211. The outer rod sleeve 211 and the inner rod body 212 are coaxially connected by screws. A fixing sleeve 220 is sleeved on the outer rod sleeve 211. The brake positioning seat 310, the brake movable disc 320, and the wheel frame disc 230 are sleeved on the inner rod body 212. The brake positioning seat 310 and the brake movable disc 320 are located between the corresponding fixing sleeve 220 and the wheel frame disc 230. The outer wall of the inner rod body 212 has a protruding limiting groove 213 extending axially. The brake positioning seat 310 and... The brake disc 320 is connected to the fixed sleeve 220. The inner wall of the brake disc 320 is provided with a limiting block 321 that slides within the limiting groove 213. The brake positioning seat 310 is provided with a connecting rod 311 for connecting to the corresponding side crank 150. The end faces of the brake positioning seat 310 and the brake disc 320 adjacent to each other are respectively provided with two arc-shaped grooves 390 and two arc-shaped blocks 391 arranged alternately along the circumference. When the brake positioning seat 310 rotates relative to the brake disc 320, it pushes the brake disc 320 to move axially and press against the side of the corresponding wheel frame disc 230. The brake disc 320 has three locking holes 330 arranged at intervals along its circumference. The wheel frame disc 230 is connected with three locking holes 330 that are paired one-to-one with each locking hole 330. A corresponding wheel frame locking pin 340 is provided, with one end of the wheel frame locking pin 340 extending through the wheel frame disc 230 towards the brake disc 320. A wheel frame locking spring 341 is provided between each wheel frame locking pin 340 and the wheel frame disc 230, and the wheel frame locking spring 341 is used to push the wheel frame locking pin 340 out of the wheel frame disc 230. The wheel frame disc 230 is also connected to a rear wheel locking pin 350 and a torsion spring 360 corresponding to each rear wheel 130. The rear wheel locking pin 350 is axially movable within the wheel frame disc 230 and, when axially moving, presses against or stops pressing against the outer wall of the corresponding rear wheel 130. The torsion spring 360 is rotatably connected to the wheel frame disc 230 via a torsion spring shaft 361, with one end of the torsion spring extending out... A torsion spring wheel 362 is connected inside the wheel frame disc 230 to press against the rear wheel locking pin 350 away from the corresponding rear wheel 130. When the torsion spring 360 rotates, it pushes the corresponding rear wheel locking pin 350 to move axially to press against the corresponding rear wheel 130. A first return spring 370 for resetting the rear wheel locking pin 350 is also provided between the rear wheel locking pin 350 and the wheel frame disc 230 for driving the movement. When the brake movable disc 320 presses against the side of the wheel frame disc 230, it pushes each torsion spring 360 to rotate and causes each wheel frame locking pin 340 to insert into the corresponding locking hole 330. A second return spring 380 is sleeved on the inner rod body 212 of the brake lever 210, with both ends pressing against the brake movable disc 320 and the corresponding wheel frame disc 230 respectively.

[0038] The outer wall of the fixed sleeve 220 is connected to a control lock 400 for connecting or separating it from the corresponding brake lever 210. The outer sleeve 211 has a first lock hole 214, and the fixed sleeve 220 has a second lock hole 221 communicating with the first lock hole 214. The control lock 400 includes a lock body 410 connected to the fixed sleeve 220 and a key 420. The lock body 410 has a third lock hole 430 communicating with the second lock hole 221, a lock cylinder 440 rotatably disposed within the third lock hole 430, and a latch 450 movable along the third lock hole 430 to insert into or disengage from the first lock hole 214 and the second lock hole 221. A latch spring 460 is sleeved on the bottom outer wall of the latch 450 within the third lock hole 430. The two ends of the latch spring 460 press against the top of the latch 450 and the fixing sleeve 220 respectively. The outer wall of the latch 450 is hinged with a locking block 470 that can rotate along a vertical plane. The outer wall of the lock cylinder 440 is provided with a locking groove 480 that corresponds to and engages with the locking block 470. When the latch 450 is inserted into the first lock hole 214 and the second lock hole 221, the lock cylinder 440 rotates to make the locking block 470 engage or disengage from the locking groove 480. The top of the lock cylinder 440 extends out of the third lock hole 430 and is provided with a key hole 490 for the key 420 to be inserted.

[0039] The braking principle of the cradle base that can climb stairs is as follows: In the unbraked state, the second return spring 380 on the inner rod 212 of the brake lever 210 pushes the brake movable disc 320 to move to fit the brake positioning seat 310. At this time, the arc groove 390 and arc block 391 provided on the end face of the brake movable disc 320 and the brake positioning seat 310 are connected in a sliding fit. When the user needs to brake, they press the brake pad 240. The brake pad 240 rotates, causing the brake lever 210 to rotate. When the brake lever 210 rotates, the limiting groove 213 protruding from the outer wall of the inner rod 212 and the limiting block 321 inserted into the limiting groove 213 cause the brake movable disc 320 to rotate. At this time, the brake positioning seat 310 is connected and fixed to the fixed sleeve 220 and the corresponding side crank 150 and does not rotate, thereby causing relative rotation between the brake movable disc 320 and the brake positioning seat 310. This causes the arc-shaped block 391 on the end face of the brake movable disc 320 to move along the arc groove 390 on the end face of the brake positioning seat 310 to the arc block 391. This causes the brake positioning seat 310 to push the brake movable disc 320 to move axially along the brake lever 210, compressing the second return spring 380 until it is in contact with the side wall of the corresponding wheel frame disc 230. When the brake movable disc 320 presses against the side of the wheel frame disc 230, it pushes the wheel frame. The three torsion springs 360 on the side of disc 230 rotate. When the torsion springs 360 rotate, they drive the torsion spring wheel 362 to press against the corresponding rear wheel locking pin 350 and move axially to compress the first return spring 370 until it presses against the corresponding rear wheel 130, thereby locking the position of the rear wheel 130 and preventing it from moving. When the brake movable disc 320 presses against the side of the wheel frame disc 230, the three wheel frame locking pins 340 connected to the wheel frame disc 230 are respectively inserted into the three locking holes 330 on the brake movable disc 320, thereby synchronizing the wheel frame disc 230 and the brake movable disc 320 circumferentially. At this time, since the brake movable disc 320 and the inner rod body 212 of the brake lever 210 are connected through the limiting groove 213 and the limiting block 321, the wheel frame disc 230 and the brake lever 210 cannot rotate axially synchronously, thereby locking the wheel frame disc 230 and the three corresponding rear wheels 130 and preventing them from rotating at the same time as the brake pad 240 is pressed. When the brake is released, the compressed second return spring 380 pushes the brake disc 320 to move in the opposite direction to fit the brake positioning seat 310 and move away from the wheel frame disc 230. This causes the three wheel frame locking pins 340 connected to the wheel frame disc 230 to disengage from the three snap-fit ​​holes on the brake disc 320, and the brake disc 320 to stop pressing against the three torsion springs 360. The torsion springs 360 rotate in the opposite direction to reset and stop driving the torsion spring wheel 362 to press against the corresponding rear wheel locking pin 350. The compressed first return spring 370 pushes the rear wheel locking pin 350 to move in the opposite direction to stop pressing against the corresponding rear wheel 130, thereby releasing the locking of the wheel frame disc 230 and the three rear wheels 130.

[0040] When the cradle base with climbing stairs is in normal use, the user rotates the gate-shaped handrail 110 to an angle of approximately 70 degrees with the vehicle base 100, so that the second pins 250 connected to the bottom of both ends of the gate-shaped handrail 110 are aligned with the second pin holes 260 on the two handrail brackets 190 respectively. Then, the two second pins 250 are pushed axially to insert into the corresponding second pin holes 260, locking the position of the gate-shaped handrail 110 in place. At this time, the bottom of both ends of the gate-shaped handrail 110 drives the two L-shaped cranks 150 to rotate through the hinged rotating rods 140, causing the fixing sleeves 220 connected to the two cranks 150 to move the fitted brake lever 210 to the plane of the vehicle base 100. Figure 1 As shown, due to gravity, the three rear wheels 130 connected to each wheel frame disc 230 are arranged in a top-bottom, two-top configuration to roll and support the bottom surface. The user can normally push the vehicle base 100 along the bottom surface. When climbing stairs is required, the user only needs to push the two second pins 250 to move in the opposite direction along the axial direction to disengage from the corresponding second pin holes 260 to unlock the gate-shaped handrail 110. Rotate the gate-shaped handrail 110 until it is parallel to the vehicle base 100, so that the first pins 170 connected to the two handrail fixing brackets 160 are aligned with the first pin holes 180 respectively provided at the top of the two ends of the gate-shaped handrail 110. Then push the first pins 170 to move axially and insert them into the corresponding first pin holes 180, fixing and locking the gate-shaped handrail 110 to the vehicle base 100. At this time, the bottom of the two ends of the gate-shaped handrail 110 drives the two L-shaped cranks 150 to rotate through the hinged rotating rods 140, so that the fixing sleeves 220 connected to the two cranks 150 drive the fitted brake lever 210 to move to the position below the vehicle base 100. Figure 2 As shown, the user can hold the door-shaped handrail 110 to go up and down the stairs. When going up the stairs, due to the pulling force of the front wheel 120 at the front end of the vehicle base 100 and the door-shaped handrail 110, and the compression of the stairs, the crank 150 drives the wheel frame disc 230 to rotate until the two rear wheels 130 connected to the wheel frame disc 230 roll up and down simultaneously, pressing against the side wall of the stairs and no longer moving forward. At this time, due to the pulling force of the front wheel 120 and the door-shaped handrail 110, the crank 150 pushes the two rear wheels 130 rolling against the side wall of the stairs to roll up simultaneously until the upper rear wheel 130 is suspended in the air. The wheel frame disc 230 rotates to make the upper rear wheel 130 roll against the top wall of the previous step and continue to move until the lower rear wheel 130 rises along the side wall of the stairs and rolls against the top wall of the previous step, thus realizing the climbing of one step of stairs. After that, the above actions are repeated to climb the stairs. When going down the stairs, the operation is reversed.

[0041] Simultaneously, the user can connect or disconnect the fixed sleeve 220 from the corresponding brake lever 210 via the control lock 400 connected to the outer wall of the fixed sleeve 220. When it is necessary to separate the fixed sleeve 220 from the corresponding brake lever 210 for unlocking, the user inserts the key 420 into the keyhole 490 at the top of the lock cylinder 440 and rotates it to rotate the lock cylinder 440. When the lock cylinder 440 rotates, it causes the locking groove 480 to rotate, pushing the lock block 470, which is engaged in the locking groove 480, to compress the lock block spring 471 and disengage from the locking groove 480. This stops the locking groove 480 from engaging and restricting the position of the lock block 470, causing the compressed latch spring 460 to push the latch 450 upward until the bottom of the latch 450 disengages from the first lock hole 214 and the second lock hole 221, releasing the connection between the fixed sleeve 220 and the corresponding brake lever 210. Unlocking; when it is necessary to lock the position of the fixing sleeve 220 and the corresponding brake lever 210, first press down the latch 450 to compress the latch spring 460, so that the bottom of the latch 450 is inserted into the first lock hole 214 and the second lock hole 221 to lock the position of the fixing sleeve 220 and the corresponding brake lever 210. Then, use the key 420 to drive the reverse lock cylinder 440 to rotate, so that when the lock cylinder 440 rotates, it drives the locking groove 480 to rotate to align with the lock block 470. At this time, the compressed lock block spring 471 pushes the lock block 470 to rotate in the opposite direction and get into the locking groove 480 on the outer wall of the lock cylinder 440 to restrict the position of the lock block 470 and the latch 450, thus completing the locking operation.

[0042] In other optional embodiments, the control lock 400 includes a lock body 410 connected to the fixed sleeve 220. The lock body 410 is provided with a third lock hole 430 communicating with the second lock hole 221 and a latch 450 that can move along the third lock hole 430 to insert into or disengage from the first lock hole 214 and the second lock hole 221. The third lock hole 430 is provided with a latch spring 460 whose two ends respectively abut against the latch 450 and the fixed sleeve 220. The outer wall of the latch 450 is provided with a boss 500. The lock body 410 is also provided with a fourth lock hole 510 communicating with the third lock hole 430 and a lock pin 520 that can move along the fourth lock hole 510 to abut against or disengage from the top of the boss 500. The fourth lock hole 510 is provided with an electromagnet 530 for driving the lock pin 520 to move along the fourth lock hole 510 and a lock pin spring 540 whose two ends respectively abut against the lock pin 520 and the electromagnet 530. When it is necessary to separate and unlock the fixing sleeve 220 from the corresponding brake lever 210, the user controls the electromagnet 530 to be energized. The electromagnet 530 attracts the locking pin 520 and moves it along the fourth locking hole 510 to disengage from the top of the boss 500 and compress the locking pin spring 540. At this time, the compressed locking tongue spring 460 pushes the locking tongue 450 upward until the bottom of the locking tongue 450 disengages from the first locking hole 214 and the second locking hole 221, releasing the locking sleeve 220 from the corresponding brake lever 210. When it is necessary to lock the fixing sleeve 220 from the corresponding brake lever 210, the user controls the electromagnet 530 to be energized. The electromagnet 530 attracts the locking pin 520 and moves it along the fourth locking hole 510 to disengage from the top of the boss 500 and compresses the locking pin spring 540. At this time, the compressed locking tongue spring 460 pushes the locking tongue 450 upward until the bottom of the locking tongue 450 disengages from the first locking hole 214 and the second locking hole 221, releasing the locking sleeve 220 from the corresponding brake lever 210. When the brake lever 210 is in position, the user first presses down on the latch 450 to compress the latch spring 460, so that the bottom of the latch 450 is inserted into the first lock hole 214 and the second lock hole 221 to lock the fixing sleeve 220 to the corresponding position of the brake lever 210. Then, the electromagnet 530 is de-energized, and the electromagnet 530 stops attracting the locking pin 520. The compressed locking pin spring 540 pushes the locking pin 520 to move in the opposite direction along the fourth lock hole 510 to press against the top of the boss 500 to limit the position of the latch 450, thus completing the locking operation.

[0043] In other alternative embodiments, the control lock 400 may also be a conventional electromagnetic lock or mechanical lock to lock or separate the brake lever 210 and the fixing sleeve 220 sleeved on the brake lever 210.

[0044] The embodiments described above are some, but not all, of the embodiments of this application. The detailed description of the embodiments of this application is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

Claims

1. A cradle base with a climbing staircase, comprising a vehicle base, gate-shaped handrails hinged at both ends to the sides of the vehicle base, and front wheels connected to both sides of one end of the vehicle base, characterized in that, The vehicle base has brake levers extending along its width on both sides at the other end, and fixed sleeves and wheel carrier discs rotatably fitted onto the corresponding brake levers. Each wheel carrier disc is connected to at least three rotatable rear wheels, which are spaced apart circumferentially along the corresponding wheel carrier disc. Rotating rods are hinged to the bottom of both ends of the portal armrest. Two L-shaped cranks are hinged to both sides of the vehicle base, one end of each crank being hinged to a corresponding rotating rod, and the other end connecting to a corresponding fixed sleeve. When the portal armrest rotates from a preset angle with the vehicle base to parallel, the two brake levers rotate from being flush with the vehicle base to being below the vehicle base. At least one brake lever is connected to a brake pad and a brake assembly. When the brake lever rotates, the brake assembly drives the corresponding wheel carrier disc and each rear wheel to lock or unlock synchronously. The brake assembly includes a slidably fitted onto the wheel carrier disc. The brake lever has a brake positioning seat and a brake movable disc, the brake positioning seat being connected to the fixed sleeve; when the brake positioning seat rotates relative to the brake movable disc, it pushes the brake movable disc to move axially and press against the side of the corresponding wheel frame disc, the brake movable disc having at least one locking hole; the wheel frame disc is connected to wheel frame locking pins corresponding to the locking holes one by one, the wheel frame disc is also connected to rear wheel locking pins and torsion springs corresponding to the rear wheels one by one, the torsion springs being configured to push the rear wheel locking pins to move and press against the corresponding rear wheels when rotated, a first return spring for driving the rear wheel locking pins to return to their original position between the rear wheel locking pins and the wheel frame disc; when the brake movable disc presses against the side of the wheel frame disc, it pushes each of the torsion springs to rotate and causes each of the wheel frame locking pins to insert into the corresponding locking hole; the brake lever is fitted with a second return spring at both ends that press against the brake movable disc and the corresponding wheel frame disc respectively.

2. The cradle base with climbable stairs according to claim 1, characterized in that, The vehicle base has handrail fixing frames connected to both sides of the top of the front wheel end. When the gate-shaped handrail is rotated to be parallel to the vehicle base, the handrail fixing frame can be selectively connected or separated from the gate-shaped handrail.

3. The cradle base with climbable stairs according to claim 2, characterized in that, The handrail fixing frame is connected to a first pin that can move axially. The two ends of the gate-shaped handrail are respectively provided with first pin holes. When the gate-shaped handrail is rotated to be parallel to the vehicle base, the first pin moves axially to insert into or disengage from the corresponding first pin hole.

4. The cradle base with climbable stairs according to claim 1, characterized in that, The outer wall of the brake lever and the inner wall of the brake disc are slidably connected by an axially extending concave-convex structure, and the end faces of the brake positioning seat and the brake disc are slidably connected by at least two circumferentially alternating arc-shaped grooves and arc-shaped blocks.

5. The cradle base with a climbable staircase according to claim 1, characterized in that, The fixed sleeve is equipped with a control lock for connecting or disconnecting it from the corresponding brake lever.

6. The cradle base with a climbable staircase according to claim 5, characterized in that, The brake lever has a first lock hole, and the fixed sleeve has a second lock hole communicating with the first lock hole. The control lock includes a lock body and a key connected to the fixed sleeve. The lock body has a third lock hole communicating with the second lock hole, a lock cylinder rotatably disposed in the third lock hole, and a lock tongue that can move along the third lock hole to insert into or disengage from the first lock hole and the second lock hole. The third lock hole has a lock tongue spring with its two ends respectively pressing against the lock tongue and the fixed sleeve. The outer wall of the lock tongue is hinged with a rotatable lock block, and a lock block spring is also connected between the lock tongue and the lock block. The outer wall of the lock cylinder has a locking groove that corresponds to and engages with the lock block. When the lock tongue is inserted into the first lock hole and the second lock hole, the lock cylinder rotates to cause the lock block to engage or disengage from the locking groove. One end of the lock cylinder extends out of the third lock hole and has a keyhole for the key to be inserted.

7. The cradle base with a climbable staircase according to claim 6, characterized in that, The brake lever has a first locking hole, and the fixed sleeve has a second locking hole communicating with the first locking hole. The control lock includes a lock body connected to the fixed sleeve. The lock body has a third locking hole communicating with the second locking hole and a latch that can move along the third locking hole to insert into or disengage from the first locking hole and the second locking hole. The third locking hole has a latch spring with its two ends respectively pressing against the latch and the fixed sleeve. The outer wall of the latch has a protrusion. The lock body also has a fourth locking hole communicating with the third locking hole and a locking pin that can move along the fourth locking hole to press against or disengage from the top of the protrusion. The fourth locking hole has an electromagnet for driving the locking pin to move along the fourth locking hole and a locking pin spring with its two ends respectively pressing against the locking pin and the electromagnet.

Images