Multilayer wind spring for a display support and lifting support thereof

A multilayer wind spring for a display support and a lifting support thereof, the multilayer wind spring is formed by tightly attaching and winding multiple elastic metal sheets, each of the elastic metal sheets comprises: a stretching connection portion which is not involved in winding and unwinding and is always kept in an initial state, a movable sheet portion which is involved in winding and unwinding, and an unmovable wound portion which is not involved in stretching and is always kept in a wound state, the stretching connection portion, the movable sheet portion, and the unmovable wound portion are formed integrally and sequentially arranged in an unwinding direction, and the elastic metal sheets of the unmovable wound portions are arranged fixedly relative to one another.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a U.S. National Phase Application of International Application No. PCT/CN2017/100405, filed Sep. 4, 2017, which claims priority to Chinese Application No. 201710550795.7, filed Jul. 7, 2017, each of which are hereby incorporated by reference in their entirety.

TECHNICAL FIELD

The present disclosure relates to the technical field of coil spring, and in particular to a multilayer wind spring for a display support and a lifting support thereof.

BACKGROUND ART

At present, a display screen is usually supported by a lifting support, the lifting support comprises a stand column and a lifting seat, and the display screen is disposed on the stand column via the lifting seat with its height being adjustable.

A constant force spring (a type of wind spring) is disposed between the stand column and the lifting seat, and arbitrary stopping of the display screen during the adjustment of its height can be achieved by means of the constant force spring.

In order to meet the requirement of ultra-thinning development of stand column, those skilled in the art have attempted to replace the existing single-layer constant force spring with a multilayer wind spring, so as to effectively reduce the space occupied by the constant force spring in the stand column, thereby meeting the requirement of ultra-thinning of the stand column.

However, the multilayer wind spring has very short service life. An arching phenomenon of an inner-layer metal sheet frequently occurs during its use. Once the inner-layer metal sheet arches, the multilayer wind spring can no longer be used normally and has to be replaced, thereby resulting in bad user experience while increasing the maintenance cost.

In the prior art, it is necessary to apply a lubricating oil between two adjacent elastic metal sheets, so as to avoid the arching phenomenon to the greatest extent for a long period of time during the use of the multilayer wind spring. The process of manufacturing the multilayer wind spring comprises making elastic metal sheets by rolling forming and heat treatment, and finally combining the multiple elastic metal sheets into a multilayer wind spring by a spring-combining (making) machine. Since the applied lubricating oil is washed away during the heat treatment, the lubricating oil must be applied during the spring-combining process. However, since the elastic metal sheets have all been formed by pressing at this moment, the oil application procedure is complicated with low efficiency.

SUMMARY OF THE DISCLOSURE

An object of the present disclosure is to provide a multilayer wind spring for a display support, so as to solve the technical problem existing in the prior art that the multilayer wind spring has very short service life and the arching phenomenon of inner-layer metal sheet frequently occurs during its use, and to solve the problem that it is necessary to apply a lubricating oil between two adjacent elastic metal sheets and the oil application procedure is complicated with low efficiency.

Another object of the present disclosure is to provide a lifting support having the above-mentioned multilayer wind spring for a display support, which is ultra-thinner and has longer service life and lower maintenance cost compared with those in the prior art.

In order to solve the above technical problems, the present disclosure provides a multilayer wind spring, which is formed by tightly attaching and winding multiple elastic metal sheets,

each of the elastic metal sheet comprises: a stretching connection portion which is not involved in winding and unwinding and is always kept in an initial state (the stretching connection portion is an outwardly extending portion of an outermost layer or an outermost turn of the wound portion of the elastic metal sheet after the multilayer wind spring is wound up to an extreme position), a movable sheet portion which is involved in winding and unwinding, and an unmovable wound portion which is not involved in stretching and is always kept in a wound state (the unmovable wound portion is usually wound for not less than one turn, and for less than one turn in particular situations,

the stretching connection portion, the movable sheet portion, and the unmovable wound portion are formed integrally and sequentially arranged in an unwinding direction,

on the unmovable wound portions, all the elastic metal sheets are fixedly arranged relative to one another.

During use of a multi-sheet type wind spring formed by stacking and winding multiple elastic metal sheets together, the arching phenomenon of the elastic metal sheet frequently occurs. Those skilled in the art have been plagued by this technical problem for many years.

The applicant has discovered through long-term study that the reason of arching is the dislocation between the elastic metal sheets during the unwinding process, and when the elastic metal sheets are wound up, the wound shape of the wound portion severely hinders the elastic metal sheets from returning to the state before dislocation, so that the arched wind spring cannot be normally used.

In the present disclosure, the unmovable wound portions of the multiple elastic metal sheets are fixedly arranged relative to one another, so as to effectively avoid dislocation between the elastic metal sheets of the winding reel portion of the multilayer wind spring, thereby effectively solving the arching phenomenon of the wind spring, and thereby greatly prolonging the service life of the multilayer wind spring, which makes it possible to popularize and apply the multilayer wind spring.

Further, the elastic metal sheet comprises a wound end at the side of the unmovable wound portion, and the wound ends of two adjacent elastic metal sheets are fixed relative to each other.

Further, the wind spring is formed by tightly attaching and winding 2 to 7 elastic metal sheets.

Further, the wind spring is formed by tightly attaching and winding 2 to 3 elastic metal sheets together.

Further, the unmovable wound portion is wound for 3 to 10 turns.

Further, the elastic metal sheets of the unmovable unwound portions are fixedly connected together by means of a rivet, a screw, a buckle, a pin, a mortise-tenon structure, bundling, welding or bonding.

Further, a through hole is provided in the middle of the unmovable wound portion,

a rotary drum is inserted into the through hole, the rotary drum is rotatably sleeved on a rotating shaft, and the unmovable wound portion of the elastic metal sheet is fixedly connected with the rotary drum.

Specifically, the unmovable wound portion of the elastic metal sheet is fixedly connected to the rotary drum by means of a screw, a pin, a rivet or the like. The winding reel portion of the multilayer wind spring is rotatably disposed on the rotating shaft via the rotary drum, and the rotating shaft is then disposed across a connected component such as a holder, a support or the like.

Further, no lubricating oil is applied between two adjacent elastic metal sheets.

In the prior art, it is necessary to apply lubricating oil between two adjacent elastic metal sheets, so as to avoid the arching phenomenon to the greatest extent for a long period of time during the use of the multilayer wind spring. The process of manufacturing the multilayer wind spring comprises making elastic metal sheets by roll forming and heat treatment, and finally combining the multiple elastic metal sheets into a multilayer wind spring by a spring-combining machine. Since the applied lubricating oil is washed away during the heat treatment, the lubricating oil must be applied during the spring-combining process. However, since the elastic metal sheets have all been formed by pressing at this moment, the oil application procedure is complicated with low efficiency.

In contrast, in the present disclosure, the occurrence of the arching phenomenon is effectively avoided by the arrangement described above, whereby it is possible that no lubricating oil is applied between the elastic metal sheets. Accordingly, the multiple elastic metal sheets can be stacked together and simultaneously subjected to rolling forming and heat treatment, which no longer requires the spring-combining procedure while omitting the complicated oil application procedure, thereby greatly improving the production efficiency.

Further, the elastic metal sheet is a metal sheet having uniform thickness and consistent width for making a constant force spring.

Further, the stretching connection portion is provided with a semi-restricted structure used for connection with a connected component, some or all of the elastic metal sheets are provided with the semi-restricted structures, and the semi-restricted structure is provided to have a movement allowance in an unwinding or winding-up direction of the elastic metal sheets, and during an unwinding or winding process of the multilayer wind spring, the stretching connection portion of the elastic metal sheet provided with the semi-restricted structure is arranged to be slidable within the range of the movement allowance relative to the connected component.

Further, a fastening connector for connecting the stretching connection portion to the connected component is inserted into the semi-restricted structure, and the fastening connector and the semi-restricted structure are provided to have the movement allowance therebetween, wherein the fastening connector does not completely press and lock the stretching connection portion, and the stretching connection portion is arranged to be slidable relative to the fastening connector.

Further, the semi-restricted structure is an elongated hole or an elongated slot or a round hole, and the elongated hole or the elongated slot has its length direction arranged in the unwinding or winding-up direction of the elastic metal sheet. The fastening connector is a screw, a bolt, a pin, a hook, a rivet, or the like. Further, the multiple elastic metal sheets are divided into an outer-layer elastic metal sheet disposed at the outermost side and an inner-layer elastic metal sheet wrapped by the outer-layer elastic metal sheet, the inner-layer elastic metal sheet is provided with the semi-restricted structure, and the stretching connection portion of the outer-layer elastic metal sheet is fixedly connected with the connected component.

Preferably, the elongated hole is an obround kidney-shaped hole.

A long strip shaped, elongated hole or elongated slot, or a U-shaped opening is provided on the stretching connection portion of the elastic metal sheet and is disposed in the unwinding direction of the elastic metal sheet, so that when a certain elastic metal sheet tends to arch due to dislocation during use, the stretching connection portion of this elastic metal sheet freely stretches and retracts via the elongated hole, the elongated slot or the U-shaped opening, so as to eliminate the stress that causes arching of the elastic metal sheet, and prevent the elastic metal sheet from arching, thereby further ensuring the service life of the multilayer wind spring.

With the technical solutions described above, the present disclosure has the following beneficial effects:

A multilayer wind spring provided by the present disclosure has a simple structure and provides a stronger supporting force, and the present disclosure occupies smaller space while providing the same supporting force. In the present disclosure, the plurality of elastic metal sheets are fixedly connected to one other at corresponding parts of the unmovable wound portions, so as to effectively avoid dislocation between the plurality of elastic metal sheets of the winding reel portion of the wind spring, thereby effectively solving the arching phenomenon of the wind spring, and thereby greatly prolonging the service life of the multilayer wind spring, which makes it possible to popularize and apply the multilayer wind spring.

In addition, the present disclosure also discloses a lifting support having the above-mentioned multilayer wind spring for a display support, which comprises a stand column and a lifting seat,

wherein the lifting seat is disposed on the stand column in such a manner that it is slidable up and down,

the stretching connection portion of the multilayer wind spring is connected to the lifting seat or the stand column,

the unmovable wound portion of the multilayer wind spring is rotatably disposed on the stand column or the lifting seat, and

the multilayer wind spring tends to force the lifting seat to move upwards, thereby providing a supporting force for supporting the lifting seat.

Further, the stretching connection portion of the elastic metal sheet provided with the semi-restricted structure is arranged to be slidable within the range of the movement allowance relative to the lifting seat or the stand column.

Further, the unmovable wound portion of the multilayer wind spring is rotatably disposed on the stand column or the lifting seat via a rotary drum or a semi-wrapped spring base for constant force spring.

Further, the lifting support is a display screen support, and a display screen is disposed on the lifting seat.

By using a multilayer wind spring in the lifting support disclosed in the present disclosure, the number of wind springs arranged is greatly reduced, while the supporting force is kept unchanged, and therefore the sliding chute space used for accommodating the wind springs is effectively reduced. Since the sliding chute space is usually arranged inside the stand column, it is possible to achieve a thinner stand column, or a higher supporting strength of the stand column in the case where the requirement for the sliding chute space is reduced.

REFERENCE NUMERALS

DETAILED DESCRIPTION OF EMBODIMENTS

The technical solutions of the present disclosure will be clearly and completely described below with reference to the drawings. It is apparent that the embodiments to be described are some, but not all of the embodiments of the present disclosure. All the other embodiments obtained by those of ordinary skill in the art in light of the embodiments of the present disclosure without inventive efforts would fall within the scope of the present disclosure as claimed.

In the description of the present disclosure, it should be noted that orientation or positional relations indicated by the terms such as “center”, “up”, “down”, “left”, “right”, “vertical”, “horizontal”, “inner”, and “outer” are the orientation or positional relations shown based on the figures, and these terms are intended only to facilitate the description of the present disclosure and simplify the description, but not intended to indicate or imply that the referred devices or elements must be in a particular orientation or constructed or operated in the particular orientation, and therefore should not be construed as limiting the present disclosure. In addition, the terms “first”, “second”, and “third” are used for descriptive purpose only, and should not be understood as an indication or implication of relative importance.

In the description of the present disclosure, it should be noted that unless otherwise expressly specified or defined, terms “mount”, “connect with”, and “connect” should be understood in a broad sense. For example, connection may be fixed connection or detachable connection or integral connection, may be mechanical connection or electric connection, or may be direct coupling or indirect coupling via an intermediate medium or internal communication between two elements. The specific meanings of the above-mentioned terms in the present disclosure could be understood by those of ordinary skill in the art according to specific situations.

The present disclosure will be further explained and described below in connection with specific embodiments.

As shown inFIG. 1andFIG. 2, the present embodiment provides a multilayer wind spring for a display support. The multilayer wind spring is formed by tightly attaching and winding a plurality of elastic metal sheets10,

each of the elastic metal sheet10comprises: a stretching connection portion11which is not involved in winding and unwinding and is always kept in an initial state (the stretching connection portion11is an outwardly extending portion of an outermost layer or an outermost turn of the wound portion of the elastic metal sheet10after the multilayer wind spring is wound up to an extreme position), a movable sheet portion12which is involved in winding and unwinding, and an unmovable wound portion13which is not involved in stretching and is always kept in a wound state (the unmovable wound portion13is usually wound for not less than one turn, and for less than one turn in particular situations,

the stretching connection portion11, the movable sheet portion12, and the unmovable wound portion13are sequentially arranged in an unwinding direction,

the plurality of elastic metal sheets10of the unmovable wound portions13are fixedly arranged relative to one another.

During use of a multi-sheet type wind spring formed by stacking and winding a plurality of elastic metal sheets10together, the arching phenomenon of the elastic metal sheet10frequently occurs. Those skilled in the art have been plagued by this technical problem for many years.

The applicant has discovered through long-term study that the reason for the arching is the dislocation between the elastic metal sheets10during the unwinding process, and when the elastic metal sheets10are wound up, the wound shape of the wound portion severely hinders the elastic metal sheets10from returning to the state before dislocation, so that the arched wind spring cannot be normally used.

In the present disclosure, the unmovable wound portions13of the plurality of elastic metal sheets10are fixedly arranged relative to one another, so as to effectively avoid dislocation between the plurality of elastic metal sheets10of the winding reel portion of the multilayer wind spring, thereby effectively solving the arching phenomenon of the wind spring, and thereby greatly prolonging the service life of the multilayer wind spring, which makes it possible to popularize and apply the multilayer wind spring.

In other words, the fully unwound elastic metal sheet10comprises a wound end at the side of the unmovable wound portion, and the wound ends of two adjacent elastic metal sheets10are fixed relative to each other.

In general, the multilayer wind spring is formed by tightly attaching and winding 2 to 5 elastic metal sheets10. More preferably, the wind spring is formed by tightly attaching and winding 2 to 3 elastic metal sheets10.

Specifically, the wound ends of the plurality of elastic metal sheets10, that is, the unmovable wound portions13of the plurality of elastic metal sheets10, are fixedly connected by a rivet(s)20.

Of course, they may also be fixedly connected by using other means such as a screw, a buckle, bundling, welding or bonding.

Alternatively, as shown inFIG. 3, a through hole16is provided in the middle of the unmovable wound portion13.

A rotary drum40is inserted into the through hole16, the rotary drum40is rotatably sleeved on a rotating shaft, and the plurality of elastic metal sheets10are fixedly connected with the rotary drum40.

Specifically, the unmovable wound portion13of the elastic metal sheet10is fixedly connected to the rotary drum40by means of a screw, a pin, a rivet or the like. The unmovable wound portion13(otherwise referred to as the winding reel portion of the multilayer wind spring) is rotatably disposed on the rotating shaft via the rotary drum40, and the rotating shaft is then disposed across a connected component such as a holder, a support or the like.

No lubricating oil is applied between two adjacent elastic metal sheets10.

As shown inFIG. 4, in the prior art, it is necessary to apply lubricating oil30between two adjacent elastic metal sheets10, so as to avoid the arching phenomenon to the greatest extent for a long period of time during the use of the multilayer wind spring. The process of manufacturing the multilayer wind spring comprises making elastic metal sheets by roll forming and heat treatment, and finally combining the multiple elastic metal sheets10into a multilayer wind spring by a spring-combining machine. Since the applied lubricating oil30is washed away during the heat treatment, the lubricating oil must be applied during the spring-combining process. However, since the elastic metal sheets have all been formed by pressing at this moment, the oil application procedure is complicated with low efficiency.

In contrast, in the present disclosure, the occurrence of the arching phenomenon is effectively avoided by the arrangement described above, whereby it is possible that no lubricating oil is applied between the elastic metal sheets10. Accordingly, the multiple elastic metal sheets10can be stacked together and simultaneously subjected to rolling forming and heat treatment, which no longer requires the spring-combining procedure while omitting the complicated oil application procedure, thereby greatly improving the production efficiency.

In the above, the elastic metal sheet10is a metal sheet having uniform thickness and consistent width for making a constant force spring.

A multilayer wind spring provided by the present disclosure has a simple structure and provides a stronger supporting force, and the present disclosure occupies smaller space while providing the same supporting force. In the present disclosure, the plurality of elastic metal sheets10are fixedly connected to one other at corresponding parts of the unmovable wound portions13, so as to effectively avoid dislocation between the plurality of elastic metal sheets10of the winding reel portion of the wind spring, thereby effectively solving the arching phenomenon of the wind spring, and thereby greatly prolonging the service life of the multilayer wind spring, which makes it possible to popularize and apply the multilayer wind spring.

The structure of the present embodiment is basically the same as that of the first embodiment, except that:

as shown inFIG. 5, the stretching connection portion11of the elastic metal sheet10is provided with a connection structure used for connection with a connected component,

the connection structure of some or all of the elastic metal sheets10(inner-layer elastic metal sheets102in the present embodiment) is a semi-restricted structure14.

As shown inFIG. 6andFIG. 7, the semi-restricted structure14is provided to have a movement allowance δ in an unwinding or winding-up direction of the elastic metal sheets10, and

during an unwinding or winding process of the multilayer wind spring, the stretching connection portion11of the elastic metal sheet10provided with the semi-restricted structure14is arranged to be slidable within the range of the movement allowance δ relative to the connected component.

When in use, after the stretching connection portions11of the multilayer wind spring are connected via the connection structure, the stretching connection portions11of some or all of the elastic metal sheets10are arranged to be slidable relative to each other in the unwinding or winding direction.

In the above, the number of the elastic metal sheets is set to be n, where n is a natural number greater than zero. The number of elastic metal sheets10provided with the semi-restricted structure14is preferably in the range of 1 to n−1. That is, a connection structure of retaining one elastic metal sheet10is not a semi-restricted structure14, and the stretching connection portion of this elastic metal sheet is fixedly connected with the connected component.

Specifically, the plurality of elastic metal sheets10are divided into an outer-layer elastic metal sheet101disposed at the outermost side, and one or more inner-layer elastic metal sheets102wrapped by the outer-layer metal sheet, the inner-layer elastic metal sheet102is provided with the semi-restricted structure, and the stretching connection portion11of the outer-layer elastic metal sheet101is fixedly connected with the connected component.

That is, the connection structure of the stretching connection portion11of the outer-layer elastic metal sheet101is a round connection hole15, the stretching connection portion11of the outer-layer elastic metal sheet101is fixedly connected with the connected component, and the connection structure of the inner-layer elastic metal sheet102is the semi-restricted structure14.

For the winding reel portion (or the unmovable wound portion13) of the multilayer wind spring, the outer-layer elastic metal sheet101is the outermost elastic metal sheet10, and for the stretching connection portion11of the multilayer wind spring, the outermost side is the side most distant from the unmovable wound portion13, and when the stretching connection portion11is disposed horizontally, the winding reel portion (or the unmovable wound portion13) is at a higher position, then the outer-layer elastic metal sheet101refers to an elastic metal sheet10disposed at the lowest position.

As shown inFIG. 6, the semi-restricted structure14is an elongated hole (a kidney-shaped hole or an obround hole) or an elongated slot, the elongated hole or the elongated slot is arranged in the unwinding or winding-up direction of the elastic metal sheet10, a fastening connector1such as a screw, a bolt or a rivet is inserted into the elongated hole or the elongated slot for connecting the stretching connection portion11to the connected component, and after the fastening connector1is inserted into the elongated hole or the elongated slot, a gap which serves as the movement allowance δ is present between the fastening connector1and the elongated hole or the elongated slot, wherein the fastening connector does not completely press and lock the stretching connection portion, and the stretching connection portion is arranged to be slidable relative to the fastening connector.

As shown inFIG. 7, the semi-restricted structure14is a round connection hole, and the fastening connector1such as a screw, a bolt or a rivet is inserted into the connection hole for connecting the stretching connection portion11to the connected component. After the fastening connector1is inserted into the connection hole, the hole diameter of the connection hole is larger than the outer diameter of the fastening connector1, and therefore a gap which serves as the movement allowance δ is present between the fastening connector1and the round connection hole. The movement allowance δ is the difference between the hole diameter of the connection hole and the outer diameter of the fastening connector. Here, the fastening connector does not completely press and lock the stretching connection portion, and the stretching connection portion is arranged to be slidable relative to the fastening connector.

In the above, the movement allowance δ is 0.5 to 5 mm, more preferably 0.6 to 2 mm.

That is, the length of the elongated hole or the elongated slot is 0.5 to 5 mm larger than the outer diameter of the fastening connector1, and when the semi-restricted structure14is a connection hole, the hole diameter of the connection hole is 0.5 to 5 mm larger than the outer diameter of the fastening connector1.

In the above, the elongated hole or the elongated slot is used for disposing the stretching connection portion11of the multilayer wind spring on the stand column2or the lifting seat3of the lifting support.

Preferably, the elongated hole is an obround kidney-shaped hole. When a certain elastic metal sheet10tends to arch due to dislocation during use, the stretching connection portion11of this elastic metal sheet10freely stretches and retracts within the range of the movement allowance δ via the semi-restricted structure14such as an elongated hole or an elongated slot, so as to eliminate the stress that causes the arching of the elastic metal sheet10, and prevent the elastic metal sheet10from arching, thereby further ensuring the service life of the multilayer wind spring.

As shown inFIG. 8, another implementation of the semi-restricted structure is as follows: the ends of the stretching connection portions11of n elastic metal sheets10are bent towards the opposite side of the unmovable wound portion13to form a hook17used as a connection structure, and the hook17and the unmovable wound portion13have an S shape, and the hook17is hooked onto the connected component, and the hook17of from the 2ndmetal sheet to the nthmetal sheet can move unidirectionally in a stretching direction away from the unmovable wound portion13.

The movement allowance δ is calculated as follows:

the thickness of the elastic metal sheet is h, after the movable sheet portion12is wholly wound up and wound around the outer side of the unmovable wound portion13, the maximum number of wound turns of the movable sheet portion12of the elastic metal sheet is m, and the movement allowance δ of the jthmetal sheet is 2π mh±0.5 mm,
whereinh>0,m>0, 2≤j≤n.

In the winding and unwinding processes, the elastic metal sheet10at a different turn displaces or arches at a different degree. In order to ensure that each elastic metal sheet10can be fully unwound to eliminate all the stresses which cause arching, it should be met that the movement allowance δ is 2π mh±0.5 mm, that is, after a fastener such as a screw runs through the semi-restricted structure14such as an elongated hole or an elongated slot, the semi-restricted structure14at least retains a movement allowance δ of 2π mh±0.5 mm.

A long strip shaped, elongated hole or elongated slot, or a U-shaped opening is provided on the stretching connection portion11of the elastic metal sheet10and is disposed in the unwinding direction of the elastic metal sheet10, so that when a certain elastic metal sheet10tends to arch due to dislocation during use, the stretching connection portion11of this elastic metal sheet10freely stretches and retracts via the elongated hole, the elongated slot or the U-shaped opening, so as to eliminate the stress that causes the arching of the elastic metal sheet10, and prevent the elastic metal sheet10from arching, thereby further ensuring the service life of the multilayer wind spring.

As shown inFIG. 1andFIG. 9, the present embodiment discloses a lifting support having the above-mentioned multilayer wind spring, which comprises a stand column2and a lifting seat3,

wherein, the lifting seat3is disposed on the stand column2in such a manner that it is slidable up and down,

the stretching connection portion11of the multilayer wind spring is connected to the lifting seat3or the stand column2,

the stretching connection portion11of the elastic metal sheet10provided with the semi-restricted structure14is arranged to be slidable within the range of the movement allowance relative to the lifting seat3or the stand column2,

the unmovable wound portion13of the multilayer wind spring is rotatably disposed on the stand column2or the lifting seat, and

the multilayer wind spring tends to force the lifting seat3to move upwards, thereby providing a supporting force for supporting the lifting seat3.

The unmovable wound portion13of the multilayer wind spring is rotatably disposed on the stand column2or the lifting seat3via a rotary drum or a semi-wrapped spring base for constant force spring.

The lifting support is a display screen support, and a display screen is disposed on the lifting seat3.

By using a multilayer wind spring in the lifting support disclosed in the present disclosure, the number of wind springs arranged is greatly reduced, while the supporting force is kept unchanged, and therefore the sliding chute space used for accommodating the wind springs is effectively reduced. Since the sliding chute space is usually arranged inside the stand column, it is possible to achieve a thinner stand column2, or a higher supporting strength of the stand column2in the case where the requirement for the sliding chute space is reduced.

Finally, it should be noted that the above embodiments are only used to illustrate, rather than limit, the technical solutions of the present disclosure, although the present disclosure has been described in detail in connection with the above embodiments, it should be understood by those of ordinary skill in the art that the technical solutions described in the foregoing embodiments can still be modified, or equivalent substitution can be made to some or all of the technical features therein, and the modification or substitution would not cause the substance of the corresponding technical solutions to depart from the scope of the technical solutions of the embodiments of the present disclosure.