KR102178475B1 - Chair caster with self-locking function - Google Patents

Abstract

The present invention relates to a caster combined with various types of chairs. More specifically, a wheel shaft combined with a pair of wheels with respect to a caster housing is moved up and down from the housing by a spring, engaged gear parts are formed on both sides of the housing, and engaging gear parts corresponding to the engaged gear parts are formed on a pair of the wheels such that if the housing is moved down by a load applied by a user to the caster, the engaged gear parts and the engaging gear parts are engaged with each other to lead the rotation of the wheels to come into a locked state. Thus, as soon as a user sits on the chair, the rotation of the caster to the wheels automatically comes into a locked state such that the user can use the chair in a firmly fixed state, and, even if the user just moves or stretches his or her body while sitting on the chair, the chair does not move, which means that there is no need to repetitively adjust the position of the chair because the chair can be prevented from being unnecessarily moved. Moreover, if the user needs to move the chair, the user can get up from the chair or just put his or her hips up from the chair to make the caster wheels automatically unlocked such that the user can move the chair to a desired position in a desired direction, thereby bringing about excellent user convenience, and also, the caster employs an existing housing-and-wheel constitution, which can lead to structural simplification and excellent durability, thereby being economical.

Description

Chair caster with self-locking function by load {Chair caster with self-locking function}

The present invention relates to a caster that is used in combination with various types of chairs, and more particularly, the wheel is made to move up and down by a spring from the housing of the chair caster, but the housing and the wheel correspond to each other. When the housing is lowered from the load acting on the chair, the locking gear portion of the housing and the locking gear portion of the wheel are engaged with each other so that the rotation locking state of the wheel is automatically achieved. It is about a caster for a chair.

In general, various types of casters are mounted below the support angle of a universal chair having a seat plate and a support angle, and the casters serve to easily move the chair itself and the chair at the same time. It has the purpose of moving or correcting the position and posture conveniently while sitting at the table.

Such a chair caster is typically coupled to a caster housing so that a single object or a pair of wheels can be freely rotated by a lateral wheel shaft, and the upper side of the housing is also coupled to allow free rotation from the housing. A vertical fixed shaft is coupled, and the housing is freely rotated from the support angle by the fixed axis coupled to the support angle of the chair, and the caster is freely rotated in the desired direction by a wheel that is freely rotated from the housing. It can be easily moved by switching and rolling of the wheel.

In addition, in recent years, for more free rotation and rolling of the caster, a tansul ring is provided on the shaft into which a pair of wheels is press-fit, as in Utility Model Registration No. 20-0274176, so that the shaft and the wheel can be easily coupled by an instantaneous impact force. By doing so, it is possible to improve workability and productivity by shortening the working time according to the caster assembly, and the combined wheel is free to rotate by the elastic ring, minimizing the friction caused by rotation of the caster Chair casters that can improve the rolling function have been devised and registered.

Next, in the case of Registration Utility Model No. 20-0390709, a fixed structure for chair casters was devised to facilitate insertion of the chair leg support shaft pins that are inserted into the support shaft of casters that are injection-molded made of synthetic resin, prevent separation and smooth rotation. In the chair caster that is injection-molded with synthetic resin, the threaded portion of the upper end of the support shaft pin is coupled to the screw connection pipe of the chair leg, and the coupling ring groove and the shaft ball at the lower end of the support shaft pin are coupled to the coupling ring jaw formed on the support shaft of the caster and the bearing Chair casters, including those formed through the center or the side of the bearing to allow ventilation holes to pass therethrough, have been registered.

In particular, in recent years, casters equipped with various types of locking means have been devised to prevent the chair from moving unnecessarily or in an unintended situation due to the above casters. Patent No. 10-1037763 Like the swivel chair of the user, it is possible to move the chair while the user is sitting on the chair, and at the same time, when the user sits on the chair while the switch member is locked, the movement of the chair can be prevented, and the structure is simple and easy to use. It is possible to reduce the manufacturing cost, as well as easy maintenance/repair chair casters have been devised and registered.

In addition, as in Patent Registration No. 10-1060164, it relates to a caster of a chair that prevents slipping when seated on a chair to provide a stable and comfortable chair. For this purpose, it is possible to rotate on both sides of the shaft penetrating the body. In the caster of the chair consisting of a pair of wheels coupled to each other and a support shaft respectively coupled to the branch support of the chair upward from one side of the body, a shaft operating hole is provided on one side of the body so that the support shaft can be operated vertically. And a slide hole communicating with the shaft operating hole is formed in the body on which the wheel is installed, and a stopper spring capable of maintaining a gap when not pressed is coupled to a wheel boss in which the shaft fixing hole of the wheel is formed. A chair caster that penetrates the slide hole at one end to support the lower end of the support shaft inside the shaft operating hole, and the other end of the stopper spring is fixed to the body so that the stopper spring can tighten the outer circumference of the wheel boss when the support shaft is pressed. It has been drafted and registered.

However, in the existing chair casters, when weight movement such as moving the upper body or stretching while sitting on the chair occurs, the caster wheel rolls and the chair moves, so there is annoyance due to unnecessary movement of the chair. The improved caster to eliminate unnecessary movement is also very cumbersome in use due to the complicated structure and excessive operation method.

In other words, a chair equipped with a caster has improved movement and movement very conveniently. However, if the movement of the weight and the change of the center of gravity occur even in a state not intended by the user, the chair frequently moves unintentionally. In the case of a caster having a locking means for fixing the rotational state of the wheel or the wheel, the inconvenience of correcting the posture or moving the position is very large, since excessive configuration and complicated devices and parts are added to provide the locking means. Not only the productivity is very low, but also the economic efficiency is also markedly low.

In particular, the non-rotating caster with a complex operation method is composed of a large number of components, so it is not only inferior in durability, but also causes unnecessary noise.The size is inevitably larger than the existing casters, so it does not match the chair, as well as users It is very inconvenient to use because it is frequently caught on the feet of the person.

In addition, in the case of casters whose rotation of the wheel is suppressed by the tightening force or pressing force of the spring, when an excessive movement occurs or a weight above average is applied, the rotation preventing force of the wheel is lost or released, and the target task cannot be faithfully performed. Has.

Korea registered utility model 20-0274176 (2002.04.22. registered) Korea Registered Utility Model 20-0390709 (Registered on July 14, 2005) Korean Patent Registration 10-1037763 (Registered on May 23, 2011) Korean Patent Registration 10-1060164 (2011.08.23 registered)

The present invention is to improve the problems as described above, the wheel shaft to which a pair of wheels is coupled with respect to the caster housing to flow up and down by a spring from the housing, forming locking gears on both sides of the housing, The pair of wheels is provided with a locking gear part and a corresponding locking gear part, and when the housing is lowered by a user's load on the caster, the locking gear part and the locking gear part engage with each other to lock the rotation of the wheel. As configured to be in a state,

As the user's weight is applied to the chair and the rotation of the caster wheel is automatically suppressed, unnecessary movement or movement of the chair is prevented.If the chair needs to be moved, stand up from the chair or lift the hips to the desired direction and position. It is an object of the present invention to provide a caster for a chair having an automatic locking function by a load capable of being moved.

In the present invention for achieving the above object, a pair of wheels is coupled to a housing of a chair caster using a lateral wheel shaft, and a vertical fixed shaft is freely rotated from the housing on the upper side of the housing. In the fixed-coupled chair caster, a wheelhouse is formed on both sides of the housing to accommodate the wheel, and a downwardly protruding support is formed between the wheelhouses, and the wheel shaft is in an up-and-down flow state between the wheelhouses. A long hole to be inserted is formed through the transverse direction, and an elastic spring and a tension support are sequentially inserted and formed so as to be positioned above the wheel shaft inserted into the long hole by forming an insertion groove from the lower side in the support part,

A locking gear part is formed protruding from both sides of the support part, and a locking gear part corresponding to the locking gear part is formed on one side of the wheel, so that the wheel is raised from the support part by the wheel shaft and elastic spring inserted into the long hole. It is configured to be elastically raised and lowered, the locking gear portion and the locking gear portion are engaged or separated from each other according to the elevation of the wheel, and rotational locking or unlocking of the wheel is performed.

In the present invention, the rotation of the wheel of the caster is automatically locked while seating on the chair so that the chair can be used in a solid fixed state, and operations such as simply moving the body or stretching the body while seated on the chair Since the chair does not move even if you take, it is not necessary to repeatedly adjust the position of the chair as unnecessary movement and movement of the chair is prevented.If you need to move the chair, stand up from the chair or raise your hips to lock the caster wheel. Is automatically released and can be moved to a desired direction and position, so it is very convenient in use, and it is very economical because it has excellent structural simplicity and durability because it uses the existing housing and wheel configuration as it is.

1 is an overall exploded perspective view of a caster according to the present invention
Figure 2 is a cross-sectional view of the entire combination of the caster according to the present invention
3 is an overall exploded cross-sectional view of a caster according to the present invention
Figure 4 is an overall side cross-sectional view of the caster according to the present invention
Figure 5 is another side cross-sectional view of the caster according to the present invention
Figure 6 is a front cross-sectional operation state diagram of the caster according to the present invention
Figure 7 is a side cross-sectional operation state diagram of the caster according to the present invention
Figure 8 is a cross-sectional view showing another embodiment of a caster according to the present invention
9 is an explanatory view of the operation of the caster according to FIG. 8
10 is a combined cross-sectional view showing another embodiment of a caster according to the present invention
11 is an explanatory view of the operation of the caster according to FIG. 10
12 is an exemplary view of the use of the caster according to the present invention

Additional objects, features, and advantages of the present invention may be more clearly understood from the following detailed description and accompanying drawings.

Prior to the detailed description of the present invention, the present invention is capable of various modifications and various embodiments, and the examples described below and shown in the drawings are intended to limit the present invention to specific embodiments. It should be understood as including all changes, equivalents, and substitutes included in the spirit and scope of the present invention.

In addition, when a component is referred to as being "connected" or "connected" to another component, it may be directly connected or connected to the other component, but other components may exist in the middle. It should be understood that there is. On the other hand, when a component is referred to as being "directly connected" or "directly connected" to another component, it should be understood that there is no other component in the middle.

Subsequently, the terms used in the present specification are used only to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as "comprise" or "have" are intended to designate the presence of features, numbers, steps, actions, components, parts, or a combination thereof described in the specification, but one or more other features. It is to be understood that the presence or addition of elements or numbers, steps, actions, components, parts, or combinations thereof, does not preclude in advance.

In addition, terms such as "... unit", "... unit", and "... module" described in the specification mean a unit that processes at least one function or operation, which is hardware, software, or hardware and It can be implemented as a combination of software.

In addition, in the description with reference to the accompanying drawings, the same reference numerals are assigned to the same components regardless of the reference numerals, and redundant descriptions thereof will be omitted. In describing the present invention, when it is determined that a detailed description of related known technologies may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an overall exploded perspective view of a caster according to the present invention, FIG. 2 is a combined cross-sectional view of a caster according to the present invention, FIG. 3 is an overall exploded cross-sectional view of a caster according to the present invention, and FIG. 4 is a view of the caster according to the present invention. An overall side cross-sectional view, FIG. 5 is an overall side cross-sectional view of another caster according to the present invention.

As shown in the figure, the chair caster according to the present invention is coupled so that a pair of wheels 200 and 200 ′ are freely rotated by the wheel shaft 210 on both sides of the caster housing 100 made using synthetic resin as before. The fixed shaft 300 made of a metal material is coupled to one side to be deflected to allow free rotation from the housing 100 on the upper side of the housing 100, and the fixed shaft 300 supports the chair. As the housing 100 is rigidly coupled and fixed to each lower end, the housing 100 can freely rotate from the support angle, and the wheels 200 and 200 ′ from the housing 100 are also freely rotated and freely rotated with respect to the chair. It is possible to convert and move.

Accordingly, in the present invention, wheel houses 101 and 101 ′ in which the wheels 200 and 200 are accommodated are formed on both sides of the housing 100 and protrude downward between these wheel houses 101 and 101 ′. In the support part 102, a long hole 103 through which the wheel shaft 210 is inserted in an upward and downward flow state is formed through the support part 102 in the transverse direction, and the support part 102 has The elastic spring 110 and the tension support 120 are sequentially inserted so as to be positioned above the wheel shaft 210 inserted into the long hole 103 by forming the insertion groove 104 upward from the lower side.

In addition, engaging gear portions 105 and 105 ′ positioned on the upper side of the long hole 103 are formed to protrude outward on both side surfaces of the support part 102, and the locking gear portions 105 and 105 ′ are formed on one side of the wheel 200 and 200 ′. It is configured by forming the circular locking gear portions 201 and 201' corresponding to the gear portions 105 and 105'.

Accordingly, by the wheel shaft 210 and the elastic spring 110 inserted into the long hole 103, the wheel 200, 200 ′ is elastically raised and lowered from the support part 102, and the wheel According to the elevation of (200) (200'), the locking gear portion 105, 105' and the locking gear portion 201, 201' are engaged or separated from each other, and rotated about the wheel 200, 200'. It is configured to be locked or unlocked.

Subsequently, the tension support 120 has a curved groove 121 that matches the outer diameter of the wheel shaft 210 on the bottom surface, and a guide formed in the middle portion of the wheel shaft 210 in the curved groove 121 By forming the locking protrusion 122 to be inserted into the groove 211, the wheel shaft 210 is configured to be in close contact with the lower portion of the tension support 120, and the wheel shaft 210 by the curved groove 121 The bottom surface of the tension support 120 is in contact with the outer surface of the wheel so that a stable close contact can be achieved without mutual slip, and the locking protrusion 122 is inserted into the guide groove 211 of the wheel shaft 210 and the wheel shaft 210 While it does not interfere with the rotation of the wheel shaft 210, it serves to suppress the flow in the transverse direction.

Accordingly, the caster of the present invention is in a state in which the fixed shaft 300 is coupled to the chair support angle as shown in FIGS. 6 and 7, and when the user sits on the chair, the user's weight is transmitted through the chair seat plate and the support angle. It is transmitted to the caster, the load acting on the fixed shaft 300 lowers the housing 100, and due to the lowering of the housing 100, the wheel shaft 210 is a long hole 103 formed in the support part 102 As it is positioned above the elastic spring 110, compression occurs.

In addition, when the housing 100 is lowered, the engaging gear portions 105 and 105 ′ on both sides of the support unit 102 are lowered together, and the lower engaging gear portions 105 and 105 ′ include the wheel 200 ( 200') is formed in a state of engagement with the locking gear portions 201, 201'.

Accordingly, the locking gear portions 201 and 201 ′ of the wheels 200 and 200 ′ are engaged with the engaging gear portions 105 and 105 ′ of the housing 100, so that the wheels 200 and 200 The rotation of') is suppressed, and a rotation lock state for the wheels 200 and 200' is achieved by the user's weight simply by sitting on a chair.

In such a state, when the user stands up from the chair or lifts the buttocks, the wheel shaft 210 is pushed out through the tension support 120 due to the restoring force of the elastic spring 110 in a compressed state while being lost by the load acting on the chair. And, since the force pushing the wheel shaft 210 will act as a force to lift the housing 100 instead of the wheels 200 and 200 ′ located on the floor, the seat plate and the support angle of the chair rise to a certain height. The locking gear portions 105 and 105 ′ of the housing 100 and the locking gear portions 201 and 201 ′ of the wheels 200 and 200 ′ are separated from each other, and accordingly, the wheel 200 ( 200') is in a free rotation state, so it is possible to freely change the direction and move the chair.

Therefore, the moment the user sits in the chair, the wheel 200, 200' is locked by the weight, and when the user stands up from the chair or removes the load, the wheel 200, 200' is freely rotated. As a result, the movement of the chair can be made easily, and the entire housing 100 can be rotated due to the fixed shaft 300 coupled in a free rotation state from the housing 100, so that the direction change for the chair is also possible. It can be done freely together.

Next, in the present invention, as shown in FIG. 8, a locking protrusion 301 is formed on the upper side of the fixed shaft 300 so as to be positioned between the upper surface of the housing 100 and the locking protrusion 301. A separately provided rebound spring 310 is inserted into and the lower end of the fixed shaft 300 penetrates through the housing 100 and is configured to be exposed downward, so that a separate support block is provided at the lower end of the exposed fixed shaft 300 ( 320) is fixedly formed, but the support block 320 is made of an outer diameter larger than the outer diameter of the fixed shaft 300 and is bolted to the lower end of the fixed shaft 300, and the outer surface of the support block 320 is made of a soft elastic material. The cushion member 330 may be configured to be coupled to each other.

Thus, when seating on a chair equipped with a caster of the present invention, the user's weight acts on the fixed shaft 300 to lower the fixed shaft 300 as shown in FIG. 9 and compress the rebound spring 310. As the fixed shaft 300 descends, the support block 320 and the cushion member 330 at the lower end of the fixed shaft 300 also descend toward the bottom surface.

In addition, the user's body weight is transferred to the housing 100 by the rebound spring 310 during the descending process of the fixed shaft 300, and the lowering of the housing 100 together with the lowering of the fixed shaft 300 Wheel 200, 200' due to mutual engagement between the locking gears 105, 105' in the housing 100 and the locking gears 201, 201' of the wheels 200, 200' while rising Of course, the fixed shaft 300 that continues to descend is the cushion member 330 at the lower end in contact with the bottom surface as well as the occurrence of the locked state.

At this time, in a state in which the fixed shaft 300 descends and the cushion member 330 abuts the floor surface, the engagement state between the locking gear portions 105, 105' and the locking gear portions 201, 201' is incomplete. To avoid this, a strict design for the entire length of the fixed shaft 300 should be made.

Therefore, the fixed shaft 300 that penetrates the housing 100 and protrudes downward as described above is rotated with respect to the wheels 200 and 200 ′ in a mutually meshed state due to the lowering of the housing 100 and the As the cushion member 330 touches the floor, a double movement prevention measure is established, and even if damage or a problem occurs with one of the movement prevention means, another movement prevention means, that is, a wheel lock state or a cushion member ( Since the floor support state by 330) is continuously operated in the form of mutual complementation, it is possible to more effectively prevent the chair from moving unnecessarily while sitting on the chair.

In addition, in the present invention, as shown in Figs. 10 and 11, brake grooves 202 and 202' having a tapered shape are formed on the circumferential surfaces of the wheels 200 and 200', and the wheel of the housing 100 Inside the house 101, 101', a taper-shaped brake protrusion 106, 106' corresponding to the brake groove 202, 202' is formed, so that the brake protrusions 106, 106' As the brake grooves 202 and 202 ′ are inserted into and interfere with each other, a rotation suppression force for the wheels 200 and 200 ′ may be generated.

That is, as described above, when a user is seated on a chair equipped with a caster of the present invention, the housing 100 is lowered due to the user's weight. When the housing 100 is lowered, the housing 100 is The wheelhouse 101, 101', the lower brake protrusions 105, 105' also descend together, and the brake protrusions 105, 105 ′ become the brake grooves 202 and 202 of the wheels 200 and 200 ′. ').

In this process, as the brake protrusions 105 and 105 ′, which are also tapered, are inserted into the taper-shaped brake grooves 202 and 202 ′, strong frictional resistance is generated. Due to the friction, the wheel 200 and 200 ′ are naturally locked in rotation.

Accordingly, the caster of the present invention can prevent unnecessary movement of the chair by applying a single or multiple rotation locking means and unlocking means for the wheels 200 and 200 ′, and these locking means and unlocking means Is not operated separately by the user, but is operated automatically simply by sitting on a chair or standing up from a chair, so the convenience in use is very excellent.

In addition, it is very efficient because the locking and unlocking states of the wheels 200 and 200 ′ can be achieved quickly and effectively with only a relatively simple configuration, and it is made by applying and improving the basic components of the existing casters. There is no external difference such as changes in the original size and shape, so it can be applied to various types of chairs as shown in Fig. 12, as well as rejection or incongruity in removing the existing casters and replacing them with the casters of the present invention. There is very little this is very reasonable.

The configurations shown in the embodiments and drawings as described above are only the most preferred embodiment of the present invention, and do not represent all the technical spirit of the present invention, so various equivalents and modifications that can replace them It should be understood that there may be examples.

100: housing 101,101': wheel house
102: support 103: long hole
104: insertion groove 105,105': locking gear portion
106,106': brake protrusion
110: tongue spring
120: tension support 121: curved groove
122: interstitial protrusion
200,200': wheel 201,201': gauge fisherman
202,202': brake groove
210: wheel shaft 211: guide groove
300: fixed shaft 301: locking jaw
310: rebound spring
320: support block
330: cushion member

Claims (4)

A pair of wheels 200 and 200 ′ are coupled to the housing 100 of the chair caster using a wheel shaft 210 in the transverse direction, and a vertical fixed shaft 300 is provided on the upper side of the housing 100. Provided with a caster for a chair coupled and fixed so as to freely rotate from the housing 100,
Wheel houses 101 and 101 ′ in which the wheels 200 and 200 ′ are accommodated on both sides of the housing 100 are formed, and between the wheel houses 101 and 101 ′ are formed downwardly protruding support portions ( 102) is formed, and in the support part 102, a long hole 103 through which the wheel shaft 210 is inserted in an upward and downward flow state is formed through the transverse direction, and the support part 102 is inserted upward from the lower side. The elastic spring 110 and the tension support 120 are sequentially inserted and formed so as to be positioned above the wheel shaft 210 inserted into the long hole 103 by forming the groove 104,
Engaging gear portions 105 and 105' are protruded on both sides of the support portion 102, and a side surface of the wheel 200, 200' corresponds to the engaging gear portions 105 and 105'. The wheel 200 and 200 ′ are formed from the support part 102 by the wheel shaft 210 and the elastic spring 110 inserted into the long hole 103 by forming the locking gear parts 201 and 201 ′. , Lower elastically, and according to the lifting of the wheel 200, 200', the locking gear portion 105, 105' and the locking gear portion 201, 201' are mutually engaged or separated, and the wheel In the chair caster having an automatic locking function by a load configured to be rotated locking or unlocking for (200) (200'),
The tension support 120 has a curved groove 121 in the bottom surface that matches the outer diameter of the wheel shaft 210, and the curved groove 121 has a guide groove 211 formed in the middle of the wheel shaft 210 ) By forming the locking protrusion 122 to be inserted into the chair caster having an automatic locking function by a load, characterized in that the wheel shaft 210 is configured to be tightly locked to the lower portion of the tension support 120.
delete delete delete

Images