Patent Description:
Table is a piece of quadrilateral furniture for placing things thereon, and chair is piece of furniture for a user to rest on. The bottom of a table or chair is usually supported by four legs, and the balance of the table or chair is usually adjusted through a balancing device. This is often done with a screw-type mechanism commonly found at the bottom of the legs.

The table and chair balancing device includes screws, nuts, and connecting rods. To adjust the balance at the bottom of the table or chair, the nut is rotated to change the height of the screw, thereby adjusting the imbalanced leg at the bottom of the table or chair to the same height as other legs.

In the prior art, when the balance of the table or chair is adjusted, it is usually necessary to manually adjust the nut up and down, and it is troublesome to adjust the nuts one by one. This cannot meet the needs of people with an increasingly fast pace of life nowadays. To solve this problem, a table and chair self-balancing device is needed. A table and chair self-balancing device is known from <CIT>.

To solve the problem existing in the prior art, the invention proposes a table and chair self-balancing device.

In order to solve the technical problem, the invention adopts the following technical solution. The table and chair self-balancing device includes a mounting housing, where an inner wall of the mounting housing is provided with an adjustment assembly; and
the adjustment assembly includes a cylinder shell; the cylinder shell is fixedly connected with the inner wall of the mounting housing; a bottom of an inner wall of the cylinder shell is fixedly connected with a return spring; a top end of the return spring is fixedly connected with a piston; an outer wall of the piston is sleeved with a first washer; a top end of the piston is provided with a push rod; a bottom of the push rod is fixedly connected with a threaded element; the threaded element is inserted into an inner wall of the piston; the top end of the piston is further provided with an adjusting spring; the adjusting spring is sleeved on an outer wall of the push rod; a top end of the adjusting spring is fixedly connected with a cover; the inner wall of the cylinder shell is provided with a silicone oil chamber; an inner wall of the silicone oil chamber is filled with silicone oil; the top end of the piston is further provided with a first flow port, and a side of the piston is provided with a second flow port; and an inner diameter of the second flow port is larger than an inner diameter of the first flow port.

Preferably, a bottom of the adjusting spring is fixedly connected with a gasket; the gasket is made of a metal material; and a bottom of the gasket is provided at the top end of the piston.

Preferably, the top end of the piston is fixedly connected with a second washer; the second washer and the first washer are both made of a rubber material; and the second washer is provided at a bottom of the gasket.

Preferably, the mounting housing is made of a plastic material; an outer wall of the mounting housing is provided with multiple arc-shaped grooves; and the multiple arc-shaped grooves are distributed circumferentially on the outer wall of the mounting housing.

Preferably, a top side of the push rod is fixedly connected with an L-shaped connection element; a top end of the mounting housing is provided with a slot; and the connecting rod is inserted into the slot.

Preferably, the cylinder shell is made of a stainless steel material; a top end of the cylinder shell is provided with a groove; and the cover is provided in the groove.

The invention has the following beneficial effects:.

To describe the technical solutions in the embodiments of the invention or in the prior art more clearly, the following briefly introduces the drawings required for describing the embodiments or the prior art. Apparently, the drawings in the following description show merely some embodiments of the invention, and those of ordinary skill in the art may still derive other drawings from these drawings without creative efforts.

Reference Numerals: <NUM>. mounting housing; <NUM>. cylinder shell; <NUM>. return spring; <NUM>. piston; <NUM>. adjusting spring; <NUM>. push rod; <NUM>. first washer; <NUM>. second washer; <NUM>. gasket; <NUM>. connection element; <NUM>. cover; <NUM>. silicone oil chamber; <NUM>. first flow port; <NUM>. second flow port.

As shown in <FIG>, a table and chair self-balancing device includes mounting housing <NUM>. An inner wall of the mounting housing <NUM> is provided with an adjustment assembly.

The adjustment assembly includes cylinder shell <NUM>. The cylinder shell <NUM> is fixedly connected with the inner wall of the mounting housing <NUM>. A bottom of an inner wall of the cylinder shell <NUM> is fixedly connected with return spring <NUM>. A top end of the return spring <NUM> is fixedly connected with piston <NUM>. An outer wall of the piston <NUM> is sleeved with first washer <NUM>. A top end of the piston <NUM> is provided with push rod <NUM>. A bottom of the push rod <NUM> is fixedly connected with a threaded element. The threaded element is inserted into an inner wall of the piston <NUM>. The top end of the piston <NUM> is further provided with adjusting spring <NUM>. The adjusting spring <NUM> is sleeved on an outer wall of the push rod <NUM>. A top end of the adjusting spring <NUM> is fixedly connected with cover <NUM>. The inner wall of the cylinder shell <NUM> is provided with silicone oil chamber <NUM>. An inner wall of the silicone oil chamber <NUM> is filled with silicone oil. The top end of the piston <NUM> is further provided with first flow port <NUM>, and a side of the piston <NUM> is provided with second flow port <NUM>. An inner diameter of the second flow port <NUM> is larger than an inner diameter of the first flow port <NUM>.

In prior art, when the balance of the table or chair is adjusted, it is usually necessary to manually adjust the nut up and down, and it is troublesome to adjust the nuts one by one. This cannot meet the needs of people with an increasingly fast pace of life. The invention aims to solve the problem of inconvenient adjustment of the height of a table and chair. In the invention, the cover <NUM> is provided to facilitate the mounting of the return spring <NUM>, the piston <NUM>, and the adjusting spring <NUM> in the cylinder shell <NUM>. To mount the mounting housing <NUM> at a bottom of a table or chair leg, the push rod <NUM> is inserted into a threaded hole at the bottom of the table or chair leg. Thus, through the push rod <NUM>, the mounting housing <NUM> is mounted at the bottom of the table or chair leg. When the exposed height of the mounting housing <NUM> and the push rod <NUM> is above a horizontal plane of other table or chair leg, the threaded element at the bottom of the push rod <NUM> is subjected to an external force, thereby pushing the piston <NUM> to slide downward. Under the external force, the silicone oil in the silicone oil chamber <NUM> of the cylinder shell <NUM> flows from the first flow port <NUM> of the piston <NUM> to the other end. Due to a small diameter of the first flow port <NUM>, a flow rate of the silicone oil decreases, resulting in a reaction force on the piston <NUM>. Thus, the piston <NUM> descends slowly or stops. When the threaded element at the bottom of the push rod <NUM> is not subjected to the external force, only a force of the return spring <NUM> acts on the piston <NUM>. Due to a large diameter of the second flow port <NUM>, the flow rate of silicone oil increases. Thus, the piston <NUM> quickly slides upwards until the push rod <NUM> is pushed outward to increase the overall height. After the mounting housing is mounted at the bottom of the table or chair leg, when the mounting housing is suspended from the ground, the push rod <NUM> automatically extends until it contacts the ground. Therefore, the invention can achieve balance of the table and chair.

Further, as shown in <FIG>, a bottom of the adjusting spring <NUM> is fixedly connected with gasket <NUM>. The gasket <NUM> is made of a metal material. A bottom of the gasket <NUM> is provided at the top end of the piston <NUM>.

The metal gasket <NUM> is provided at the bottom of the adjusting spring <NUM>. The gasket <NUM> increases a contact area between the adjusting spring <NUM> and the piston <NUM>, so as to ensure stable movement of the piston <NUM>.

Further, as shown in <FIG>, the top end of the piston <NUM> is fixedly connected with second washer <NUM>. The second washer <NUM> and the first washer <NUM> are both made of a rubber material. The second washer <NUM> is provided at a bottom of the gasket <NUM>.

The second washer <NUM> made of a rubber material is provided at the top end of the piston <NUM>. The second washer <NUM> reduces an impact force of the gasket <NUM> on the piston <NUM> when the gasket <NUM> contacts the piston <NUM>.

Further, as shown in <FIG>, the mounting housing <NUM> is made of a plastic material. An outer wall of the mounting housing <NUM> is provided with arc-shaped grooves. There are multiple arc-shaped grooves distributed circumferentially on the outer wall of the mounting housing <NUM>.

The multiple arc-shaped grooves are arranged on the outer wall of the mounting housing <NUM>. The arc-shaped grooves enhance a friction force on the outer wall of the mounting housing <NUM>, thereby facilitating gripping and fixing of the mounting housing <NUM> when it is necessary to grip and mount the mounting housing <NUM>.

Further, as shown in <FIG>, a top side of the push rod <NUM> is fixedly connected with connection element <NUM>. The connection element <NUM> is L-shaped. A top end of the mounting housing <NUM> is provided with a slot, and the connecting rod is inserted into the slot.

The L-shaped connection element <NUM> is provided at the top side of the push rod <NUM>. To mount the push rod <NUM> into the threaded hole at the bottom of the table or chair leg, it is easy to pull out the connection element <NUM>. By rotating the connection element <NUM>, the push rod <NUM> is rotated into the threaded hole at the bottom of the table or chair leg.

Further, as shown in <FIG>, the cylinder shell <NUM> is made of a stainless steel material. A top end of the cylinder shell <NUM> is provided with a groove, and the cover <NUM> is provided in the groove.

The cylinder shell <NUM> is made of a stainless steel to enhance the strength of the cylinder shell <NUM>. The groove is provided at the top end of the cylinder shell <NUM> to receive the cover <NUM>.

The invention aims to solve the problem of inconvenient adjustment of the height of a table and chair. In the invention, the cover <NUM> is provided to facilitate the mounting of the return spring <NUM>, the piston <NUM>, and the adjusting spring <NUM> in the cylinder shell <NUM>. The top side of the push rod <NUM> is provided with the L-shaped connection element <NUM>. To insert the push rod <NUM> into a threaded hole at a bottom of a table or chair leg, the connection element <NUM> is easily pulled out. The connection element <NUM> is rotated, so as to rotate the push rod <NUM> into the threaded hole at the bottom of the table or chair leg. Thus, the mounting housing <NUM> is mounted at the bottom of the table or chair leg. When the exposed height of the mounting housing <NUM> and the push rod <NUM> is above a horizontal plane of other table or chair leg, the threaded element at the bottom of the push rod <NUM> is subjected to an external force, thereby pushing the piston <NUM> to slide downward. Under the external force, the silicone oil in the silicone oil chamber <NUM> of the cylinder shell <NUM> flows from the first flow port <NUM> of the piston <NUM> to the other end. Due to a small diameter of the first flow port <NUM>, a flow rate of the silicone oil decreases, resulting in a reaction force on the piston <NUM>. Thus, the piston <NUM> descends slowly or stops. When the threaded element at the bottom of the push rod <NUM> is not subjected to the external force, only a force of the return spring <NUM> acts on the piston <NUM>. Due to a large diameter of the second flow port <NUM>, the flow rate of silicone oil increases. Thus, the piston <NUM> quickly slides upwards until the push rod <NUM> is pushed outward to increase the overall height. The metal gasket <NUM> is provided at the bottom of the adjusting spring <NUM>. The gasket <NUM> increases a contact area between the adjusting spring <NUM> and the piston <NUM>, so as to ensure stable movement of the piston <NUM>. The second washer <NUM> made of a rubber material is provided at the top end of the piston <NUM>. The second washer <NUM> reduces an impact force of the gasket <NUM> on the piston <NUM> when the gasket <NUM> contacts the piston <NUM>. After the mounting housing is mounted at the bottom of the table or chair leg, when the mounting housing is suspended from the ground, the push rod <NUM> automatically extends until it contacts the ground. Therefore, the invention can achieve balance of the table and chair.

Claim 1:
A table and chair self-balancing device, comprising a mounting housing (<NUM>), wherein an inner wall of the mounting housing (<NUM>) is provided with an adjustment assembly; and
the adjustment assembly comprises a cylinder shell (<NUM>); the cylinder shell (<NUM>) is fixedly connected with the inner wall of the mounting housing (<NUM>); a bottom of an inner wall of the cylinder shell (<NUM>) is fixedly connected with a return spring (<NUM>); a top end of the return spring (<NUM>) is fixedly connected with a piston (<NUM>); an outer wall of the piston (<NUM>) is sleeved with a first washer (<NUM>); a top end of the piston (<NUM>) is provided with a push rod (<NUM>); a bottom of the push rod (<NUM>) is fixedly connected with a threaded element; the threaded element is inserted into an inner wall of the piston (<NUM>); the top end of the piston (<NUM>) is further provided with an adjusting spring (<NUM>); the adjusting spring (<NUM>) is sleeved on an outer wall of the push rod (<NUM>); a top end of the adjusting spring (<NUM>) is fixedly connected with a cover (<NUM>); the inner wall of the cylinder shell (<NUM>) is provided with a silicone oil chamber (<NUM>); an inner wall of the silicone oil chamber (<NUM>) is filled with silicone oil; the top end of the piston (<NUM>) is further provided with a first flow port (<NUM>), and a side of the piston (<NUM>) is provided with a second flow port (<NUM>); and an inner diameter of the second flow port (<NUM>) is larger than an inner diameter of the first flow port (<NUM>).