Patent Description:
In general, a multi-level shelving unit installed in built-in closets or dressing rooms, or prefabricated furniture, especially a prefabricated shelf (angle) used as a piece of office furniture, a table, a work station, an exhibition stand is a frame structure in which vertical frames and horizontal frames are combined, and it is possible to place an item on a shelf by mounting the shelf on the combined horizontal frames.

Such prefabricated furniture or a prefabricated shelf has an assembly structure that allows easy assembling without additional tools and maintains the assembled state firmly. Typically, a plurality of assembly holes are provided on a vertical frame, and assembly protrusions are provided at both ends of a horizontal frame to be inserted into the assembly holes, so that an assembly height of the horizontal frame, that is, the height of a shelf, may be changed.

Prefabricated shelves are widely used because users can freely change the height of the shelf to suit their needs.

Meanwhile, an example of a prefabricated shelf in the related art is introduced in <CIT>.

In the above related art, an assembly hole consisting of an upper part with wide left-right width and a lower part with narrow left-right width in a slit shape is provided on a vertical frame in a pair of left and right, and an assembly protrusion inserted into the assembly hole is provided on a horizontal frame in a pair of left and right, so that the assembly protrusion is assembled by being inserted into the assembly hole in an interference fit manner.

Yet, in the case of the above related art, since the assembly protrusion is supported only on one side of the assembly hole and spaced apart from the other side of the assembly hole, the supporting force for the assembly protrusion is weak, and in the assembled state, there is a risk that the assembly protrusion is bent toward the spaced-apart side, which makes reassembly after disassembly difficult and reduces stability.

Other examples of structures for prefabricated shelfs known in the art are shown in <CIT>, <CIT> and <CIT>.

Accordingly, the present disclosure has been made keeping in mind the above problems occurring in the related art, and the present disclosure is intended to provide a prefabricated shelf with a pressing protrusion portion that presses and holds an assembly protrusion protrudes from a narrow portion of an assembly hole into which the assembly protrusion is inserted in order to increase assembly stability by maintaining the tight fit of the assembly protrusion and the assembly hole more firmly.

In order to achieve the above objective, according to an embodiment of the present disclosure, there is provided a prefabricated shelf, including: a first frame in which a pair of assembly holes, each having a wide portion and a narrow portion, are arranged left-right symmetrically; and a second frame in which a pair of assembly protrusions, corresponding to the pair of assembly holes and each protruding to fit into the narrow portion, are arranged left-right symmetrically, wherein the narrow portion includes a pressing protrusion portion configured to protrude from a first end thereof and press the assembly protrusion to a second side thereof to force the assembly protrusion into place.

In addition, in the prefabricated shelf according to the present disclosure, the pressing protrusion portion consists of a pair of pressing protrusions arranged apart up and down, and the assembly protrusion includes a fixing protrusion portion fitted into a fixing groove located between the pair of pressing protrusions.

In addition, in the prefabricated shelf according to the present disclosure, in the assembly protrusion, upper and lower surfaces of a fitting portion are connected to each other in a downward slope at a predetermined slightly-tilted angle toward the fixing protrusion portion with respect to the fixing protrusion portion, so that an upper support surface of the fitting portion, the fixing protrusion portion, and a lower support surface of the fitting portion are connected in a zigzaged manner.

In addition, in the prefabricated shelf according to the present disclosure, the second frame may include a guide protrusion part protruding from a side of the assembly hole and contacting an end of the first frame.

According to a prefabricated shelf of the present disclosure, a pressing protrusion portion provided in a narrow portion into which an assembly protrusion is fitted presses the assembly protrusion so that the assembly protrusion can be more firmly coupled to an assembly hole, resulting in excellent assembly stability.

According to the prefabricated shelf of the present disclosure, the pressing protrusion portion is composed of a pair of pressing protrusions, and the assembly protrusion is provided with a fixing protrusion portion inserted into a fixing groove between the pressing protrusions, so that the assembly protrusion does not easily fall out of the assembly hole, further increasing the robustness of the assembly.

According to the prefabricated shelf of the present disclosure, a fitting portion of the assembly protrusion has an upper supporting surface and a lower supporting surface connected in a zigzaged manner around the fixing protrusion portion, so that the fixing protrusion portion is tightly fitted into the fixing groove and the pressing protrusions completely adhere to the assembly protrusion, making the fit more stable.

According to the prefabricated shelf of the present disclosure, a guide upper surface provided on the upper pressing protrusion makes it easier for the fixing protrusion portion to be inserted, thereby increasing the convenience of assembly.

According to the prefabricated shelf of the present disclosure, a guide protrusion part protruding from one side of the assembly hole guides and holds one end of a frame, preventing damage such as bending of the assembly protrusion.

Since the present disclosure may be variously modified and may have various forms, aspects (or embodiments) will be described in detail in the text.

In each drawing, the same reference numeral, particularly reference numerals having the same number of tens digits and ones digits, or tens digits, ones digits, and alphabets indicate members having the same or similar functions, and unless otherwise specified, members indicated by each reference numeral in the drawings may be identified as members conforming to these standards.

In addition, although components in each drawing are expressed in exaggeratedly large (or thick) or small (or thin) in size or thickness, or simplified in consideration of the convenience of understanding, the protection scope of the present disclosure should not be construed as being limited thereby.

Terms used in this specification are only used to describe a specific aspect (or embodiment), and are not intended to limit the present disclosure. Singular expressions include plural expressions unless the context clearly indicates otherwise.

It should be understood that the terms "comprise," "include", "have", and/or "consist of" when used herein, specify the presence of stated features, numbers, steps, operations, elements, and/or components but do not preclude the presence or addition of one or more other features, numbers, steps, operations, elements, components, and/or groups thereof.

Also, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person skilled in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application.

The terms such as "first" and "second" described in this specification are only used to distinguish between different components from each other, and are not limited to the order in which they are manufactured, and may not match the names in the detailed description of the invention and the claims.

For convenience in describing a prefabricated shelf according to the present disclosure, if a rough direction standard that is not strict is specified with reference to <FIG>, the direction in which gravity acts is set as the bottom, and the top, bottom, left, and right directions are set accordingly as shown. In the detailed description related to other drawings and in the claims, directions are specified and described according to this criterion unless otherwise specified.

Hereinafter, the prefabricated shelf according to the present disclosure will be described with reference to the accompanying drawings.

As shown in <FIG>, the present disclosure is a frame structure in which a first frame having assembly holes <NUM> and a second frame having assembly protrusions <NUM> are combined.

In the drawing, an embodiment in which a vertical frame <NUM> is provided with the assembly holes <NUM> and a horizontal frame <NUM> is provided with the assembly protrusions <NUM> is shown as a representative example, but a conversely configured case is also possible. Nevertheless, it is more preferable to be configured with a structure having the vertical frame <NUM> and the horizontal frame <NUM> as shown in the drawing for convenience of assembly and enhancement of assembly strength.

To be specific, the present disclosure includes: the vertical frame <NUM> in which a pair of assembly holes <NUM> having a wide portion <NUM> and a narrow portion <NUM> are arranged left-right symmetrically; and the horizontal frame <NUM> in which a pair of assembly protrusions <NUM>, corresponding to the pair of assembly holes <NUM> and each protruding to fit into the narrow portion <NUM>, are arranged left-right symmetrically.

The narrow portion <NUM> includes a pressing protrusion portion <NUM> that protrudes from one end thereof and presses the assembly protrusion <NUM> to the other side thereof so that the assembly protrusion <NUM> is forcibly fitted.

The vertical frame <NUM> is a first support part <NUM> and a second support part <NUM> bent and connected at right angles, and in each support part <NUM>, <NUM>, a plurality of assembly holes <NUM> in left/right pairs are arranged at a predetermined interval in the longitudinal direction.

The assembly hole <NUM> is composed of the upper wide portion <NUM> and the lower narrow portion <NUM>. The narrow portion <NUM> is biasedly connected to the lower part of the inner side of the wide portion <NUM> (on the right side in the case of the left-side wide portion <NUM> and on the left side in the case of the right-side wide portion <NUM>), and the width of each end thereof is formed to become narrower toward the lower side. Especially, the other (outer) end of the narrow portion <NUM> is connected downwardly at a slight angle toward one end.

In addition, the pressing protrusion portion <NUM> includes a pair of pressing protrusions <NUM> and <NUM> spaced apart from each other up and down.

Each of the pressing protrusions <NUM> and <NUM> protrudes in an angular or curved shape, and a fixing groove <NUM> curvedly connected in a semicircular shape is formed between the pair of pressing protrusions <NUM> and <NUM>.

In addition, the upper pressing protrusion <NUM> of the pressing protrusion portion <NUM> includes a first guide upper surface <NUM> that is inclined downward in the other direction and guides a fixing protrusion portion <NUM> of the assembly protrusion <NUM> to the other side.

At the upper end of the other end of the narrow portion <NUM>, a second guide upper surface <NUM> that is inclined downward in the opposite direction at an angle corresponding to the first guide upper surface <NUM> is provided so as to guide the assembly protrusion <NUM> fitted into the narrow portion <NUM>, especially both sides of a fitting portion <NUM>.

Meanwhile, <FIG> shows a hidden-type vertical frame <NUM>'.

The hidden-type vertical frame <NUM>' has a form in which each of support parts <NUM> and <NUM> is bent <NUM> degrees inward from each end of outer shielding parts <NUM> and <NUM> that are bent and connected at right angles. As assembly holes <NUM> are provided in the support parts <NUM> and <NUM>, the assembly holes <NUM> are not exposed to the outside and are covered.

Again, as shown in <FIG>, the horizontal frame <NUM> is a connection part <NUM> and a support part <NUM> bent and connected at right angles, and in the connection part <NUM>, a pair of left and right assembly protrusions <NUM> are arranged at a predetermined interval up and down, so that four assembly protrusions <NUM> are provided at the left and right ends of the horizontal frame <NUM>, respectively.

The assembly protrusion <NUM> is formed by cutting a part of the connection part <NUM> and consists of a fitting portion <NUM> and a hooking portion <NUM> bent at right angles and connected. The left and right assembly protrusions <NUM> are symmetrical to each other as respective hooking portions thereof <NUM> are bent in the outward opposite direction.

At this time, the hooking portion <NUM> has a smaller size than the wide portion <NUM>, and the fitting portion <NUM> has a thickness corresponding to the left-right width of the narrow portion <NUM>.

The narrow portion <NUM> is vertically longer than the fitting portion <NUM>, and the pressing protrusions <NUM> and <NUM> and the fixing groove <NUM> are formed at the end of the narrow portion <NUM> corresponding to the vertical length of the fitting portion <NUM>.

In addition, the fixing protrusion portion <NUM> is formed to protrude in an embossed shape so as to be convex to one side from the other side of the fitting portion <NUM>.

At this time, based on the fixing protrusion portion <NUM>, the fitting portion <NUM> has the upper and lower surfaces connected to each other in a downward slope at a predetermined slightly-tilted angle toward the fixing protrusion portion <NUM>, so that an upper support surface <NUM> of the fitting portion <NUM>, the fixing protrusion portion <NUM>, and a lower support surface <NUM> of the fitting portion <NUM> are connected in a zigzaged manner.

At this time, the left and right assembly protrusions <NUM> are formed so that the gap D1 between the fixing protrusion portions <NUM> is narrower than the gap D2 between the upper support surfaces <NUM> and the lower support surfaces <NUM>. Accordingly, as the pressing protrusions <NUM> and <NUM> are closely attached to the upper support surface <NUM> and the lower support surface <NUM>, the fixing protrusion portion <NUM> is tightly fitted and inserted into the fixing groove <NUM>, so that the assembly protrusion <NUM> is more firmly coupled to the assembly hole <NUM> and the coupled state is maintained.

In addition, the horizontal frame <NUM> includes a guide protrusion part <NUM> protruding from one side of the assembly protrusion <NUM> and contacting one end of the vertical frame <NUM>.

The guide protrusion part <NUM> protrudes in the form of a bridge as a part of the connection part <NUM> is incised, and a pair of the guide protrusion parts <NUM> arranged on the upper and lower collinear lines are provided in one set.

Meanwhile, <FIG> shows an intermediate support type horizontal frame <NUM>' in which a part of the middle portion of the connection part <NUM> is bent into an inner wedge shape to form a support portion 22A. The intermediate support type horizontal frame <NUM>' is used such that a shelf is mounted on the support portion 22A located at the middle-end height of the horizontal frame <NUM>.

In the present disclosure of the above configuration, first, when the horizontal frame <NUM> is pressed downwards while the hooking portion <NUM> penetrates the wide portion <NUM> from the inside to the outside of the vertical frame <NUM>, the fitting portion <NUM> is inserted into the narrow portion <NUM>, and the assembly protrusion <NUM> is forcibly fitted to the assembly hole <NUM> to assemble the vertical frame <NUM> and the horizontal frame <NUM>.

At this time, when the fitting portion <NUM> on the wide portion <NUM> is pressed downward, as the lower end of the fitting portion <NUM> contacts the second guide upper surface <NUM>, respective fitting portions <NUM> of the left and right assembly protrusions <NUM> are fitted while receiving a force in the direction of inward retraction.

In this state, the fixing protrusion portion <NUM> rides the first guide upper surface <NUM> to pass over the upper pressing protrusion <NUM> and is inserted into the fixing groove <NUM>, and as the upper pressing protrusion <NUM> and the lower pressing protrusion <NUM> are respectively in contact with the upper support surface <NUM> and the lower support surface <NUM> of the fitting portion <NUM>, respective fitting portions <NUM> of the left and right assembly protrusions <NUM> are fitted under force in the direction of opening outwards.

In conclusion, the fitting portion <NUM> of the assembly protrusion <NUM> is fitted in such a way that both sides thereof are supported by the pressing protrusions <NUM> and <NUM> of one side of the narrow portion <NUM> and the other end of the narrow portion <NUM>, so that the assembly protrusion <NUM> is more firmly assembled to the assembly hole <NUM>, and thus the assembly protrusions <NUM> are not bent by external pressure in the left and right direction acting on the horizontal frame <NUM>.

Furthermore, as one end of the vertical frame <NUM> is supported by the guide protrusion part <NUM>, the vertical frame <NUM> is sandwiched between the assembly protrusions <NUM> and the guide protrusion part <NUM>, so that left-right sway of the horizontal frame <NUM> does not occur. Therefore, while there is no problem such as bending of the fitting portion <NUM> of the assembly protrusion <NUM>, the assembly protrusion <NUM> and the assembly hole <NUM> are combined with each other with strong force, thereby further improving the assembly strength of the vertical frame <NUM> and the horizontal frame <NUM>.

In particular, in the present disclosure, since the fixing protrusion portion <NUM> having an embossing shape is not bent due to the pressing protrusions <NUM> and <NUM> and the fixing groove <NUM>, it is possible to prevent the fixing protrusion portion <NUM> from bursting or breaking.

Claim 1:
A prefabricated shelf, comprising:
a first frame (<NUM>) in which a pair of assembly holes (<NUM>), each having a wide portion(<NUM>) and a narrow portion(<NUM>), are arranged left-right symmetrically; and
a second frame (<NUM>) in which a pair of assembly protrusions (<NUM>), corresponding to the pair of assembly holes(<NUM>) and each protruding to fit into the narrow portion(<NUM>), are arranged left-right symmetrically,
wherein the narrow portion(<NUM>) comprises a pressing protrusion portion(<NUM>) configured to protrude from a first end thereof and press the assembly protrusion(<NUM>) to a second side thereof to force the assembly protrusion(<NUM>) into place; and
wherein the pressing protrusion portion(<NUM>) consists of a pair of pressing protrusions (<NUM>, <NUM>) arranged apart up and down, and
wherein the assembly protrusion(<NUM>) comprises a fixing protrusion portion(<NUM>) fitted into a fixing groove(<NUM>) located between the pair of pressing protrusions(<NUM>, <NUM>), characterized in that
the assembly protrusion(<NUM>), upper and lower surfaces of a fitting portion(<NUM>) are connected to each other in a downward slope at a predetermined slightly-tilted angle toward the fixing protrusion portion(<NUM>) with respect to the fixing protrusion portion (<NUM>), so that an upper support surface (<NUM>) of the fitting portion(<NUM>), the fixing protrusion portion(<NUM>), and a lower support surface(<NUM>) of the fitting portion(<NUM>) are connected in a zigzaged manner.