CN216546239U - Shallow and chassis thereof - Google Patents

Abstract

The utility model relates to a cart and a chassis thereof, comprising: a main front wheel support; the main front wheel bracket is coupled with the auxiliary front wheel bracket; a main front wheel disposed on the main front wheel bracket; the auxiliary front wheel is arranged on the auxiliary front wheel bracket; a guide wheel bracket; and a guide wheel disposed on the guide wheel bracket; the main front wheel bracket comprises a first state and a second state, and in the first state, the main front wheel works at a first height; in a second state, the secondary front wheel and the guide wheel operate at a second height, and in the second state the guide wheel operates at the second height earlier than the secondary front wheel, wherein the second height is lower than the first height. This application shallow easy operation is convenient, need not with the help of outside slope alright in pushing away the shallow airtight enclosure, can promote by a wide margin and transport pending article's convenience, security, the efficiency of improvement shallow work that can also be great.

Description

Shallow and chassis thereof

Technical Field

The utility model relates to the field of carts, in particular to a cart for an airtight enclosure and a chassis thereof.

Background

The low-oxygen airtight technology is a mature technology widely applied to the fields of book archives, cultural relics and the like, and can be used for killing insects, storing and the like of the book archives and the cultural relics. The airtight enclosure of the side door is matched with the low-oxygen equipment, so that small batches of book archives, cultural relics, ancient books and the like can be subjected to insect killing and storage treatment, the airtight enclosure of the side door has the advantages of small installation space, short oxygen reduction time, energy consumption saving and the like, and when the airtight enclosure of the side door is used for insect killing or storage of the cultural relics, the ancient books and the like, articles to be treated need to be placed by means of a trolley and pushed into a track in the airtight enclosure. The track in the airtight enclosure has a certain height above the ground, and in order to enable the cart to enter and exit the airtight enclosure, a slope needs to be configured, and the cart is pushed into the track of the airtight enclosure by the slope. However, in the current using process, when the cart pushes up the slope, the articles on the cart easily slip off, and a single person is difficult to push the fully loaded cart up the slope, which is not beneficial to the use of the cart for pushing the articles.

SUMMERY OF THE UTILITY MODEL

Aiming at the technical problems in the prior art, the utility model provides a cart chassis, which comprises: a main front wheel support; the main front wheel bracket is coupled with the auxiliary front wheel bracket; a main front wheel disposed on the main front wheel bracket; the auxiliary front wheel is arranged on the auxiliary front wheel bracket; a guide wheel bracket; and a guide wheel disposed on the guide wheel bracket; the main front wheel bracket comprises a first state and a second state, and in the first state, the main front wheel works at a first height; in a second state, the secondary front wheel and the guide wheel operate at a second height, and in the second state the guide wheel operates at the second height earlier than the secondary front wheel, wherein the second height is lower than the first height.

The stroller chassis as described above, wherein the main front wheel bracket is rotatable about the front axle of the sub front wheel bracket from the first state to the second state.

The stroller chassis as described above, wherein the main front wheel bracket transitions from the first state to the second state upon contacting a front obstacle.

The stroller chassis as described above, wherein the main front wheel carriage is switched from the second state to the first state under its own weight.

The stroller chassis as described above, wherein the main front wheel bracket comprises a bend.

The stroller chassis as described above, further comprising a front wheel control structure configured to lock or release the main front wheel bracket in or from a locked state of the first state.

The cart chassis comprises a front wheel control structure, a front wheel control structure and a rear wheel control structure, wherein the front wheel control structure comprises an eccentric block, a positioning block, a connecting shaft and a pedal; the positioning block is arranged on the front shaft, the eccentric block is arranged on the connecting shaft, and the pedal is arranged on one side, far away from the eccentric block, of the connecting shaft; when the eccentric block is meshed with the positioning block to lock the main front wheel bracket, the main front wheel bracket is locked in a first state, and when the eccentric block is separated from the positioning block through the pedal, the main front wheel bracket is released from the first locking state.

The stroller chassis as described above, wherein the front wheel control structure comprises a handle configured to control a state between the eccentric mass and the locating mass.

The stroller chassis as described above, wherein the front wheel control structure comprises a safety device configured to lock or unlock the handle.

The stroller chassis as described above, wherein the front wheel control structure further comprises a fixing plate and a spring, wherein one end of the spring is disposed on the connecting shaft, the other end of the spring is disposed on the fixing plate and configured to restore the position of the eccentric block, and the fixing plate is configured to fix the connecting shaft.

The stroller chassis as described above, further comprising a front axle stop, wherein the front axle stop is configured to define a front axle rotation angle.

The cart chassis as described above, wherein the front axle limiting device further comprises a stopper and a limiting post, wherein the stopper is disposed on the sub front wheel bracket, and the limiting post is disposed on the front axle.

The stroller chassis as described above, further comprising a front guide plate disposed on the front axle and configured to guide the front axle to rotate.

The stroller chassis as described above, further comprising a frame configured to connect the secondary front wheel bracket, the guide wheel bracket, and the fixed plate.

The cart chassis as described above, further comprising: a main rear wheel support; the main rear wheel bracket is coupled with the auxiliary rear wheel bracket; a main rear wheel disposed on the main rear wheel support; and an auxiliary rear wheel disposed on the auxiliary rear wheel bracket; the main rear wheel bracket comprises a first state and a second state, and in the first state, the main rear wheel works at a first height; in a second state, the secondary rear wheel operates at a second height, wherein the second height is lower than the first height.

According to another aspect of the present application, there is provided a cart comprising: a vehicle body; and a cart chassis as described above; wherein, the vehicle body is detachably connected with the cart chassis.

The stroller as described above, further comprising a handle provided on the body or on the stroller chassis as described above.

The cart as described above, the body comprising: the frame and set up in a plurality of baffles of frame.

The cart as described above, wherein the frame comprises a bottom plate, a top plate, and a plurality of uprights, wherein the plurality of uprights connect the bottom plate and the top plate and extend beyond the top plate.

The cart as described above, wherein the frame comprises a connecting tube disposed at an end of the plurality of uprights beyond the top plate and configured to connect the plurality of uprights.

This application shallow easy operation is convenient, need not with the help of outside slope alright in pushing away the shallow airtight enclosure, can promote by a wide margin and transport pending article's convenience, security, the efficiency of improvement shallow work that can also be great.

Drawings

Preferred embodiments of the present invention will now be described in further detail with reference to the accompanying drawings, in which:

FIG. 1 is a schematic view of a cart according to one embodiment of the present application; and

fig. 2A and 2B are perspective views of a chassis according to one embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the following detailed description, reference is made to the accompanying drawings that form a part hereof and in which is shown by way of illustration specific embodiments of the application. In the drawings, like numerals describe substantially similar components throughout the different views. Various specific embodiments of the present application are described in sufficient detail below to enable those skilled in the art to practice the teachings of the present application. It is to be understood that other embodiments may be utilized and structural, logical or electrical changes may be made to the embodiments of the present application.

The application provides a shallow when normal walking, can use first truckle to travel, when getting into airtight enclosure, first truckle can be folded, changes the second truckle into and traveles to can avoid using the slope, easily push away the shallow in the cabinet, easy operation is convenient. The cart of the present application may be used in a storage cabinet, display cabinet, pest killing cabinet, warehouse or other location where a certain height is to be spanned.

The technical solution of the present application is further explained by the following specific embodiments. It should be understood by those skilled in the art that the following descriptions are only provided for facilitating the understanding of the technical solutions of the present application, and should not be used to limit the scope of the present application.

FIG. 1 is a schematic view of a cart according to one embodiment of the present application. As shown, the cart 100 includes a chassis 110 and a body 120. The vehicle body 120 is disposed on the chassis 110, the vehicle body 120 may be configured to accommodate an object to be processed, and the chassis 110 may be configured to carry the vehicle body 120 and drive the vehicle body 120 to enter the airtight enclosure. In some embodiments, chassis 110 is integrally formed with body 120. In some embodiments, the chassis 110 is securely attached to the body 120. For example: welding, riveting, etc. In some embodiments, chassis 110 and body 120 may also be removably coupled. For example: the vehicle body is clamped, fixed and limited through bolt connection or the edge of the chassis comprises a clamping groove.

In some embodiments, the body 120 may be a rack, basket, cage, or the like. In some embodiments, the body 120 may include a frame 121 and a plurality of partitions 122 disposed on the frame. The partition 122 is disposed on the frame for supporting articles, so as to increase the loading capacity of the cart. In some embodiments, the partition plates 122 are detachably disposed on the frame, so that the distance between the partition plates can be arbitrarily combined, the number of the partition plates can be flexibly adjusted according to actual use requirements, the utilization rate of article placement can be improved, and the practicability of the cart can be improved. In some embodiments, the baffle 122 may be formed by a plurality of connected tubes. In some embodiments, the spacer 122 may also be one or more plates. In some embodiments, the spacing between the partitions 122 is 180 and 450 mm.

In some embodiments, frame 121 includes a top plate 123, a bottom plate 124, and a plurality of uprights 125. Wherein a plurality of posts 125 connect the top plate 123 and the bottom plate 124 and extend beyond the top plate 123, the bottom plate 124 and the top plate 123 can be used to carry articles. In some embodiments, a plurality of posts 125 are fixedly connected to the top and bottom plates. For example: welding, bolting, riveting, or the like. In some embodiments, the top plate 123 and the bottom plate 124 may be a plurality of tubes connected together. For example: and (6) welding. In some embodiments, the top plate 123, the bottom plate 124, and the upright 125 may be formed by connecting a plurality of steel pipes. In some embodiments, the distance of the post beyond the top plate is 80-200 mm.

In some embodiments, the frame 121 further includes a plurality of connecting pipes 126 disposed at the ends of the plurality of posts extending beyond the top plate 123 and connecting the plurality of posts to improve the strength and stability of the frame and also to block objects carried on the top plate and prevent the objects from falling off. In some embodiments, the frame 121 may further include a plurality of shelf brackets 127 disposed between the posts, which may be used to carry and snap-fit shelves, so that the shelves may be arbitrarily adjusted to hold objects.

In some embodiments, the frame 121 may further include a handle 128 disposed between the posts, which may be used for an operator to hold the push cart. In some embodiments, the handle 128 may also be disposed on the chassis 110, and the chassis 110 may be pushed by pushing the handle 128, so as to drive the vehicle body 120 to move. In some embodiments, the handle 128 may also have other forms. For example: rods, ropes, etc.

Fig. 2A and 2B are perspective views of a chassis according to one embodiment of the present application.

As shown, the chassis 110 includes main front wheels 201 and 202, sub front wheels 203 and 204, main rear wheels 211 and 212, sub rear wheels 213 and 214, main front wheel brackets 205 and 206, sub front wheel brackets 207 and 208, main rear wheel brackets 215 and 216, and sub rear wheel brackets 217 and 218. Wherein the main front wheels 201 and 202 are respectively provided on main front wheel brackets 205 and 206, the sub front wheels 203 and 204 are respectively provided on sub front wheel brackets 207 and 208, the main rear wheels 211 and 212 are respectively provided on main rear wheel brackets 215 and 216, and the sub rear wheels 213 and 214 are respectively provided on sub rear wheel brackets 217 and 218.

In some embodiments, primary front wheel brackets 205 and 206 are coupled with secondary front wheel brackets 207 and 208, respectively. For example: the main front wheel bracket 205 is connected to the joint of the auxiliary front wheel 203 and the auxiliary front wheel bracket 207 (for example, on the wheel axle of the auxiliary front wheel 203); the main front wheel bracket 206 is connected to the junction of the secondary front wheel 204 and the secondary front wheel bracket 208 (e.g., on the axle of the secondary front wheel 204). In some embodiments, the primary rear wheel brackets 215 and 216 are coupled with the secondary rear wheel brackets 217 and 218, respectively. For example: the main rear wheel bracket 215 is connected to the joint of the sub rear wheel 213 and the sub rear wheel bracket 217 (e.g., on the axle of the sub rear wheel 213); the main rear wheel support 216 is connected to the junction of the secondary rear wheel 214 and the secondary rear wheel support 218 (e.g., on the axle of the secondary rear wheel 214). In some embodiments, secondary front wheel brackets 207 and 208 and secondary rear wheel brackets 217 and 218 may be coupled with body 120.

In some embodiments, the main front wheel brackets 205 and 206 may include two states, a folded state and an unfolded state. Specifically, the method comprises the following steps: the main front wheel brackets 205 and 206 are folded and unfolded with respect to the sub front wheel brackets 207 and 208, respectively, and when the main front wheel brackets 205 and 206 are in the unfolded state, the chassis 110 or the cart 100 moves forward by the rotation of the main front wheels 201 and 202, and the sub front wheels 203 and 204 are not operated. When the main front wheel brackets 205 and 206 are in a folded state, the chassis 110 or the cart 100 moves forwards by rotating the auxiliary front wheels 203 and 204, and the chassis 110 or the cart 100 can adapt to plane motions of different heights by enabling the main front wheel brackets 205 and 206 to be in different states. For example: when the main front wheel supports 205 and 206 are in the unfolded state, the main front wheels 201 and 202 are in the first height rotation work, when the main front wheel supports 205 and 206 are in the folded state, the main front wheels 201 and 202 are folded along with the main front wheel supports 205 and 206, and the auxiliary front wheels 203 and 204 are in the second height rotation work, wherein the first height can be lower than the second height (relative to the ground as a reference). In some embodiments, when the main front wheel brackets 205 and 206 are in the folded position, the main front wheels 201 and 202 may also be operated at a second height. In some embodiments, the main rear wheel supports 215 and 216 also have two states, which are similar to the main front wheel supports 205 and 206 and therefore will not be described in detail.

In some embodiments, the primary front wheel brackets 205 and 206 include bends 2051 and 2061 that can be used to accommodate a step-height platform (the difference in height between the first height and the second height) to facilitate contact of the secondary front wheels 203 and 204 with the upper surface of the step-height platform (the second height) to facilitate continued movement of the cart 100. For example: the bends 2051 and 2061 may accommodate part or all of the rocker when the main front wheel encounters the rocker for facilitating contact between the secondary front wheels 203 and 204 and the upper surface of the rocker. In some embodiments, the primary rear wheel supports 215 and 216 also include bends 2151 and 2161, which may also be used to accommodate a ride-height platform to facilitate contact of the secondary rear wheels 213 and 214 with the upper surface of the ride-height platform.

In some embodiments, chassis 110 may also include guide wheels 221 and 222 and guide wheel brackets 223 and 224. The guiding wheels 221 and 222 are respectively disposed on the guiding wheel brackets 223 and 224, and are disposed in front of the secondary front wheels (referring to the forward direction of the cart, i.e. the side of the secondary front wheels far away from the secondary rear wheels), so that when the chassis 110 or the cart 100 performs the height-spanning action, the primary or the latest surface contacts or separates from the second height surface, and the cart is prevented from being turned over or toppled due to incomplete change of the state of the primary front wheel bracket. For example: when the cart enters the airtight enclosure, the guide wheel is earlier contacted with the inside of the airtight enclosure than the auxiliary front wheel, so that the condition that the main front wheel is folded to cause the cart to topple over due to the fact that the auxiliary front wheel cannot be contacted with the inside of the airtight enclosure or is incompletely contacted with the inside of the airtight enclosure can be avoided; or when the trolley leaves the airtight enclosure, the guide wheel is separated from the airtight enclosure later compared with the auxiliary front wheel, so that the phenomenon that the auxiliary front wheel is separated from the airtight enclosure and the trolley topples due to incomplete resetting of the main front wheel can be avoided. In some embodiments, the guide wheel brackets 223 and 224 may be coupled with the sub front wheel brackets 207 and 208, respectively. In some embodiments, the guide wheel brackets 223 and 224 may be directly coupled with the vehicle body.

In some embodiments, the main rear wheels 211 and 212 are universal wheels to facilitate control of the cart's direction of travel. In some embodiments, the other wheels may also be universal wheels. For example: main front wheels 201 and 202, sub front wheels 203 and 204, sub rear wheels 213 and 214, and guide wheels 221 and 222. In some embodiments, the main rear wheels 211 and/or 212 are provided with brakes to facilitate controlling the speed or stopping of the cart. In some embodiments, the other wheels may also be provided with brakes to facilitate securing the cart when it is stopped. For example: main front wheels 201 and 202, sub front wheels 203 and 204, sub rear wheels 213 and 214, and guide wheels 221 and 222.

According to one embodiment of the present application, the chassis 110 may further include a front axle 209 and a rear axle 219, wherein the front axle 209 is used for connecting the main front wheel brackets 205 and 206 with the auxiliary front wheel brackets 207 and 208, respectively, and may control the main front wheel brackets 205 and 206 to be in different states relative to the auxiliary front wheel brackets 207 and 208, so as to control the synchronous motion of the main front wheel brackets; the rear axle 219 is used to connect the main rear wheel carriers 215 and 216 with the sub rear wheel carriers 217 and 218, respectively, and also to control the main rear wheel carriers 215 and 216 in different states with respect to the sub rear wheel carriers 217 and 218 so as to control the main rear wheel carriers to operate in synchronization. In some embodiments, secondary front wheels 203 and 204 and secondary rear wheels 213 and 214 may be freely rotatable on front axle 209 and rear axle 219, respectively.

According to one embodiment of the present application, the chassis 110 may also include front wheel control structures and rear wheel control structures. Wherein a front wheel control structure may be connected to the front axle 209 and may be used to control the main front wheel brackets 205 and 206 in different states, for example: when the main front wheel brackets 205 and 206 are in the deployed state, the front wheel control structure may be in a locked state preventing it from rotating to the collapsed state. Rear wheel control structure may be coupled to the rear axle 219 and may be used to control the main rear wheel carriers 215 and 216 in different states.

In some embodiments, the front wheel control structure includes a positioning block 231, an eccentric block 232, and a connecting shaft 233. Wherein, the locating piece 231 sets up on the front axle 209, and eccentric block 232 links to each other with connecting axle 233 to can interlock mutually with locating piece 231 and be in locking state, can fix a position the front axle, prevent it from taking place to rotate, and then can prevent main front wheel support 205 and 206 from rotating, when eccentric block 232 anticlockwise rotates (with facing to the shallow direction as the reference), eccentric block 232 is in non-locking state with the separation of locating piece 231, and front axle 209 can drive locating piece 231 upwards to rotate, thereby main front wheel support 205 and 206 also can rotate. In some embodiments, the side of the eccentric mass 232 adjacent the locating block is beveled to facilitate the return of the locating block 231 to the engaged position with the eccentric mass under the weight of the main front wheel brackets 205 and 206 and the main front wheels 201 and 202.

According to an embodiment of the present application, the front wheel control structure may further include a front pedal 234 disposed on a side of the connecting shaft away from the eccentric block, which may be used to provide a stepping base for a user to step on to push the eccentric block to rotate and separate from the positioning block, so that the main front wheel brackets 205 and 206 may be controlled to fold. In some embodiments, the front wheel control structure may further include a spring 235 disposed on the connecting shaft 233, which may be used to reset the eccentric mass, and when the pedal 234 is stepped on, the eccentric mass may rotate counterclockwise, the spring 235 is in a compressed state, and when the pedal 234 is released, the spring force may reset the eccentric mass by rotating clockwise due to the existence of the spring force.

In some embodiments, the front wheel control structure may further include a handle 210, which is disposed at a handle of the vehicle body 120 (refer to fig. 1), and may be used to control a state between the eccentric block and the positioning block, thereby further facilitating control of the cart. For example: when the handle 210 is pressed down, the eccentric block 232 and the positioning block 231 are engaged and in a locking state; when the handle 210 is released, the eccentric block 232 is separated from the positioning block 231. In some embodiments, the handle 210 may be connected to the connecting shaft 233 by a connector, so that the state between the eccentric block and the positioning block can be controlled. In some embodiments, the front wheel control structure may further include a safety device (not shown) that can be used to lock or unlock the handle 210, thereby preventing the handle from being operated by mistake and causing the cart to topple over, and increasing the safety of the operation. In some embodiments, the safety feature may be a snap ring that can be locked or unlocked by snapping the control handle 210. For example: when an operator unlocks the handle 210, the handle 210 needs to be pressed down to unlock the handle, then the handle is loosened, and the eccentric block is separated from the positioning block; when the handle is pressed down again, the snap ring snaps over the handle, thereby locking the handle. In some embodiments, the safety device may be other components as well. In some embodiments, the rear wheel control structure may also include a handle 220 and a safety device, and the control method is the same as that of the front wheel control, and therefore, the detailed description thereof is omitted.

According to an embodiment of the present application, the front wheel control structure may further include fixing plates 236 and 237, which may be connected to the vehicle body 120, and may be used to fix the connecting shaft 233 and the spring 235, so as to prevent the connecting shaft 233 from moving when the pedal 234 is stepped on, and thus, the state between the eccentric block and the positioning block is affected. In some embodiments, the front wheel control structure may further include one or more bearings 238, which may be disposed between the connecting shaft 233 and the fixed plates 236 and 237 to facilitate rotation of the connecting shaft. In some embodiments, the rear wheel control structure is similar to the front wheel control structure, and therefore, the description thereof is omitted.

According to one embodiment of the present application, the chassis 110 may further include one or more front guide plates 239 and one or more rear guide plates 240. Wherein, the front guiding board 239 is disposed on the front axle 209, and pushes the front axle to rotate, so as to drive the main front wheel brackets 205 and 206 to rotate to the folded state, the rear guiding board 240 is disposed on the rear axle 219, and pushes the rear axle to rotate, so as to drive the main rear wheel brackets 215 and 216 to rotate to the folded state. For example: when the front pedal 234 is stepped on, the eccentric block 232 is separated from the positioning block 231, the front shaft 209 is in an unlocked state, the chassis 110 or the cart 100 is continuously pushed, and when the front guide plate 239 touches the frame height platform, the front shaft 209 can be pushed to rotate, so that the main front wheel brackets 205 and 206 are driven to rotate to a folded state.

In some embodiments, the shape of the front deflector 239 is similar to the shape of the main front wheel brackets 205 or 206, and the front deflector 239 is positioned in line with or slightly forward of the main front wheel brackets 205 and 206. In some embodiments, the shape of the rear guide plate 240 is similar to the shape of the front guide plate 239, and the rear guide plate 240 is positioned in line with the main rear wheel brackets 215 and 215 or slightly forward of the main rear wheel brackets 215 and 216.

According to an embodiment of the present application, the chassis 110 may further include a front limiting device and a rear limiting device, wherein the front limiting device is configured to limit the position of the main front wheel brackets 205 and 206, prevent the main front wheel brackets 205 and 206 and the main front wheels 201 and 202 from rotating excessively when returning due to their own weight, affect the rotation of the main front wheels 201 and 202, and improve the stability and safety of returning the main front wheel brackets 205 and 206; the rear limiting means is used to limit the position of the main rear wheel brackets 215 and 216 and prevent them from rotating too much when returning.

In some embodiments, the front restraint device includes a stop 241 and a restraint post 242. The limit post 242 is disposed on the front axle 209, and the stop 241 may be disposed on the secondary front wheel bracket 207 and/or the secondary front wheel bracket 208. The spacing posts 242 are in contact with the stoppers 241 when the main front wheel brackets 205 and 206 are in the unfolded state, and the spacing posts 242 are separated from the stoppers 241 when the main front wheel brackets 205 and 206 are in the folded state. In some embodiments, the rear limiting device is similar to the front limiting device, and thus, the description thereof is omitted.

In some embodiments, chassis 110 may further include a frame (not shown) that may connect secondary front wheel brackets 207 and 208, secondary rear wheel brackets 217 and 218, leading wheel brackets 221 and 222, and the fixed plates of the front and rear wheel control structures as a single unit, and may also be connected to body 120. In some embodiments, the frame may be in other forms. Such as: flat plates, etc.

When the cart of the present application is in operation, for example, entering an airtight enclosure, first, the main front wheel brackets 205 and 206 and the main rear wheel brackets 215 and 216 are both in the unfolded state, that is, the main front wheels 201 and 202 and the main rear wheels 211 and 212 are in the operation state and rotate forward. When the trolley needs to enter the airtight enclosure, the guide wheel is firstly contacted with the airtight enclosure inner platform, the trolley is continuously pushed, the auxiliary front wheels 203 and 204 are contacted with the airtight enclosure inner platform, the main front wheel brackets 205 and 206 are contacted with the airtight enclosure inner platform, the front pedal 234 is stepped or the handle 210 is loosened, the eccentric block 232 is controlled to rotate and be separated from the positioning block 231, at the moment, the spring 235 is in a compressed state, the trolley 100 is continuously pushed into the airtight enclosure, the auxiliary front wheels 203 and 204 move forwards in a rotating manner, the front guide plate 239 is contacted with the airtight enclosure, the front guide plate is pushed to drive the front shaft 209 to rotate, the main front wheel brackets 205 and 206 are further driven to rotate to be in a folded state, the front pedal 128 or the handle 210 can be loosened, the spring 235 returns to the original state to drive the eccentric block 232 to reset, the trolley is continuously pushed, and when the auxiliary rear wheels 213 and 214 are contacted with the airtight enclosure, the main rear wheel brackets 215 and 216 are controlled to be in a folded state (the main rear wheel bracket is controlled to be in the folded state and the main rear wheel bracket is controlled to be in the folded state Similar to the stack and therefore not described in detail), continued pushing may push the cart into the airtight enclosure.

When the cart is moved out of the airtight enclosure, and the auxiliary rear wheels 213 and 214 of the cart are moved to the edge of the airtight enclosure, the main rear wheel brackets 215 and 216 rotate under the action of gravity, so that the main rear wheels 211 and 212 are in contact with the ground and enter a working state, the main rear wheel brackets 215 and 216 are in an unfolded state, the positioning block is meshed with the eccentric block and is in a locked state, and the main rear wheels 211 and 212 are prevented from rotating (or the handle 220 can be pressed to control the main rear wheel brackets to be unfolded). Continuing to move the cart outward, the main front wheels 201 and 202 are likewise rotated by gravity into operation (or the handle 210 can be depressed to control the deployment of the main front wheel support). In some embodiments, counter weights may be added to the front and rear main wheels to facilitate the main wheels entering into service under their own weight when pushed out. And continuously moving the cart outwards, and removing the cart from the airtight enclosure when the wheels to be guided leave the airtight enclosure.

This application shallow easy operation is convenient, need not with the help of outside slope alright in pushing away the shallow airtight enclosure, can promote by a wide margin and transport pending article's convenience, security, the efficiency of improvement shallow work that can also be great.

The above embodiments are provided only for illustrating the present invention and not for limiting the present invention, and those skilled in the art can make various changes and modifications without departing from the scope of the present invention, and therefore, all equivalent technical solutions should fall within the scope of the present invention.

Claims (10)

1. A cart chassis, comprising:

a main front wheel support;

the main front wheel bracket is coupled with the auxiliary front wheel bracket;

a main front wheel disposed on the main front wheel bracket;

the auxiliary front wheel is arranged on the auxiliary front wheel bracket;

a guide wheel bracket; and

a guide wheel provided on the guide wheel bracket;

the main front wheel bracket comprises a first state and a second state, and in the first state, the main front wheel works at a first height; in a second state, the secondary front wheel and the guide wheel operate at a second height, and in the second state the guide wheel operates at the second height earlier than the secondary front wheel, wherein the second height is lower than the first height.

2. The stroller chassis of claim 1, wherein the primary front wheel support is rotatable about a front axis of the secondary front wheel support from the first state to the second state.

3. The stroller chassis of claim 2, further comprising a front wheel control structure configured to lock or release the main front wheel bracket in or from a locked state of the first state.

4. The stroller chassis of claim 3, wherein the front wheel control structure comprises an eccentric block, a positioning block, a connecting shaft, and a pedal; the positioning block is arranged on the front shaft, the eccentric block is arranged on the connecting shaft, and the pedal is arranged on one side, far away from the eccentric block, of the connecting shaft; when the eccentric block is meshed with the positioning block to lock the main front wheel bracket, the main front wheel bracket is locked in a first state, and when the eccentric block is separated from the positioning block through the pedal, the main front wheel bracket is released from the first locking state.

5. The stroller chassis of claim 4, wherein the front wheel control structure comprises a handle configured to control a state between the eccentric mass and the locating block.

6. The stroller chassis of claim 5, wherein the front wheel control structure comprises a safety configured to lock or unlock the handle.

7. The cart chassis of claim 1, further comprising: a main rear wheel support; the main rear wheel bracket is coupled with the auxiliary rear wheel bracket; a main rear wheel disposed on the main rear wheel support; and an auxiliary rear wheel disposed on the auxiliary rear wheel bracket; the main rear wheel bracket comprises a first state and a second state, and in the first state, the main rear wheel works at a first height; in a second state, the secondary rear wheel operates at a second height, wherein the second height is lower than the first height.

8. A cart, comprising:

a vehicle body; and

the cart chassis of any of claims 1-7;

wherein the body is detachably connected to a cart chassis according to any of claims 1-7.

9. The cart of claim 8, wherein the body comprises: the frame and set up in a plurality of baffles of frame.

10. The cart of claim 9, wherein the frame comprises a bottom plate, a top plate, a plurality of posts connecting the bottom plate and the top plate and extending beyond the top plate, and connecting tubes connecting ends of the plurality of posts extending beyond the top plate.

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