KR102202846B1 - Chair back manufacturing device - Google Patents

Abstract

The present invention relates to a chair back manufacturing device capable of finishing a backrest frame so that the tension of a mesh sheet for supporting the back can be maintained, and a manufacturing method thereof. The chair back manufacturing device comprises: a jig for fixing a lower part of a backrest frame consisting of both frames to which both ends of the mesh sheet are coupled and a lower frame which connects lower parts of both the frames; tension members for applying tension to the mesh sheet by respectively holding upper parts of the rear surfaces of both the frames fixed by the jig and externally tensioning the same; and elastic pressing members for elastically pressing upper parts of the front surfaces of both the frames held and tensioned by the tension members. The elastic pressing members each include: a slider having an elastic pressing cushion to elastically press each of the upper parts of the front surfaces of both the frames, respectively; a screw jack connected to move the slider forward and backward; a drive motor connected to drive the screw jack; and a jack support for supporting the drive motor and the screw jack.

Description

Chair back manufacturing device {CHAIR BACK MANUFACTURING DEVICE}

The present invention relates to a chair back manufacturing apparatus, and more particularly, to a chair back manufacturing apparatus capable of closing the back frame to maintain the tension of a mesh sheet supporting the back.

As is well known, a chair is a device used by a person to sit on the floor, and such a chair includes a seat plate for supporting the buttocks, legs for supporting the seat plate from the ground, and a back support for a back.

Recently, mesh sheets with excellent ventilation are used as backrests, and as a conventional technology related to these mesh sheets, Korean Utility Model Registration No. 20-0347149 (registration date March 29, 2004)'Structure of chair backrest' It is disclosed.

As described in the claims, the prior art features "a chair back structure characterized in that a mesh insertion groove is formed at both ends of the backrest frame of the chair so that the reinforcement bands that are cut and coupled to both ends of the backrest net can be inserted forcibly" To do.

However, in the above-described prior art, since the operator grabs the reinforcement strip and inserts it into the mesh insertion groove of the backrest frame by force, it is difficult to maintain the tension of the backrest network, so that the defect rate is very high during manufacturing, and the worker maintains the tension of the backrest network. Due to the hassle of having to be tense in order to do so, workability and productivity are low, and there is a problem that leads to an increase in cost in terms of economy.

(0001) Republic of Korea Utility Model Registration No. 20-0347149 (Registration Date March 29, 2004)

The present invention was conceived to solve the conventional problems as described above, and an object of the present invention is to easily finish the backrest frame to maintain the tension of the mesh sheet to improve workability and productivity, and to expect cost reduction. It is to provide a chair back manufacturing apparatus.

In order to achieve the above object, the apparatus for manufacturing a chair back according to an embodiment of the present invention includes a jig for fixing the lower portion of the back frame consisting of both side frames to which both ends of a mesh sheet are coupled and a lower frame connecting the lower portions of the both side frames. , A tension member for imparting tension to the mesh sheet by holding and tensioning the upper portions of the rear surfaces of the both side frames fixed with the jig respectively, and elastically pressing the upper front surfaces of the both side frames held and tensioned by the tension member A slider having an elastic pressing cushion so as to elastically press the front upper portions of the both sides of the frame, a screw jack connected to move the slider in the front-rear direction, and the screw jack The technical idea is to include a drive motor connected to drive the drive motor, the drive motor and a jack support for supporting the screw jack.

According to an embodiment of the present invention, a sliding rail may be provided on the upper and lower surfaces of the slider, and a guide rail may be provided on the jack support to guide the sliding of the sliding rail.

At this time, the jig includes a front jig and a rear jig installed at predetermined intervals on an upper portion of the base member to fix the lower portion of the backrest frame, and the base member includes a base plate and a base plate on which the front jig and rear jig are installed. It includes a leg for supporting from the ground, and the jack support may be supported by support brackets connected to both sides of the support plate fixed to the upper surface of the base plate.

According to an embodiment of the present invention, the screw jacks on both sides are rotatably installed in the case, a worm connected to the drive shaft of the driving motor, a worm wheel meshed with the worm and having a female thread at the center, and screwed to the female thread of the worm wheel It may include a screw shaft for moving the slider in the front-rear direction.

At this time, the worms on both sides are connected by connecting rods so that the driving force of one screw jack can be transmitted to the other screw jack.

In order to achieve the above object, the method for manufacturing a chair back according to an embodiment of the present invention includes the steps of: providing a back frame comprising both side frames to which both ends of a mesh sheet are coupled and a lower frame connecting the lower portions of the both side frames, the Fixing the lower part of the backrest frame with a jig, holding the upper rear surfaces of the both side frames with a holder, elastically pressing the upper front surfaces of the both side frames held by the holder, the elastically pressed both sides It is a technical idea to include the step of applying tension to the mesh sheet by stretching the upper part of the frame outward, and fastening the finishing frame to the upper ends of the two side frames to maintain the shape of the mesh sheet to which the tension is applied. .

According to the present invention embodied by the above-described solution, the mesh sheet to which tension is applied because the finishing frame is fastened in a state where the front upper portion of the mesh sheet is elastically pressed by the elastic pressing member and stretched outward by the tension member. It has a very useful effect that can maintain the shape of the product, improve workability and productivity, and expect cost reduction.

1 is a plan view according to an embodiment of the present invention.
2 is a cross-sectional view taken along line AA of FIG. 1.
3 is a right side view according to an embodiment of the present invention.
4 is an enlarged view showing an enlarged portion'B' of FIG.
5 and 7 are operation diagrams showing an operation state from the rear according to the embodiment of the present invention.
6 and 8 are operational diagrams respectively showing the operating states of FIGS. 5 and 7 in plan view.
Figure 9 is a rear view showing a chair back made according to an embodiment of the present invention.

In order to fully understand the present invention, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

The embodiments of the present invention may be modified in various forms, and the scope of the present invention should not be construed as being limited to the embodiments described in detail below. This embodiment is provided to more completely explain the present invention to those with average knowledge in the art.

Accordingly, the shape of the constituent elements expressed in the drawings may be exaggerated to emphasize a more clear description. It should be noted that in each drawing, the same member may be indicated by the same reference numeral. In addition, detailed descriptions of known functions and configurations determined to unnecessarily obscure the subject matter of the present invention will be omitted.

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

The chair back manufacturing apparatus of the present invention is composed of both side frames 110 and 120 to which both ends of the mesh sheet 200 are coupled and a lower frame 130 connecting the lower portions of the two side frames 110 and 120 Tension is applied to the mesh sheet 200 by holding a jig 330 fixing the lower portion of the backrest frame 100 and the upper rear surfaces of the two side frames 110 and 120 fixed by the jig 330 and stretching them outward. And an elastic pressing member 500 for elastically pressing the upper front surfaces of the two side frames 110 and 120 held and tensioned by the tension member 400 and the tension member 400.

The chair back includes a back frame 100 and a mesh seat 200 and a finishing frame 140.

The back frame 100 includes a left frame 110 and a right frame 120 disposed vertically on both left and right sides, and a lower frame 130 connecting the lower portions of the both side frames 110 and 120, as shown in FIG. As shown, it is formed in an approximately'┗┛' shape.

Referring to FIG. 4, which is an enlarged view of the'B' portion of FIG. 1, a sheet slit 111 is formed in a vertical direction at the front center of both sides frames 110 and 120 so that the ends of the mesh sheet 200 are inserted. In the inner center of the two side frames 110 and 120, a sheet coupling groove 112 is formed long in a vertical direction so as to connect and communicate with the sheet slit 111, and the coupling bar 210 of the mesh sheet 200 to be described later Is fitted.

And referring to FIG. 9, the finishing frame 140 is fitted to the upper ends of the two side frames 110 and 120 to maintain the shape of the mesh sheet 200 to which the tension is applied. To this end, fastening convex portions 141 are formed at both ends of the closing frame 140, and fastening convex portions 150 are formed at the upper ends of the both side frames 110 and 120, respectively, and fastening convex portions of the closing frame 140 ( 141).

The left and right ends of the mesh sheet 200 are provided with coupling bars 210 formed to be elongated in the vertical direction, and are fixed by fitting into the sheet coupling grooves 112 of the frames 110 and 120 at this time. Both ends of) are fitted to the seat slit 111.

The jig 330 is configured to fix the lower portion of the back frame 100, and the jig 330 is formed of a front jig 331 and a rear jig 332 and is installed on the base member 300.

Referring to FIG. 3 showing a right side view according to an embodiment of the present invention, the base member 300 includes a base plate 310 and a leg 320.

The front jig 331 and the rear jig 332 are installed at predetermined intervals at the rear of the upper surface of the base plate 310, and the rear jig 332 is formed to have a vertical length longer than that of the front jig 331, and the front jig ( The lower portion of the backrest frame 100 is seated and fixed between the 331 and the rear jig 332. A vertically long support plate 340 is installed in front of the upper surface of the base plate 310 to support the elastic pressing member 500.

The leg 320 is connected to the lower portion of the base plate 310 to support the base plate 310 from the ground.

The tension member 400 holds the upper portions of the rear surfaces of the two side frames 110 and 120 fixed by the jig 330 and tensions them to the outside, thereby imparting tension to the mesh sheet 200.

Referring to FIG. 1 showing a plan view according to an embodiment of the present invention, the tension member 400 includes a holder 410 for holding the upper rear surfaces of the frames 110 and 120 respectively, and the holders 410 on both sides of the back frame It includes an actuator that pulls outward of 100 to tension the upper portions of both side frames 110 and 120.

As shown in FIG. 4, the holder 410 is formed in an approximately “a” shape to serve as both a function of holding and supporting the upper and inner rear surfaces of the frames 110 and 120.

The actuator is preferably implemented as a hydraulic or pneumatic cylinder 420 that is supported by a cylinder bracket 430 installed on the base plate 310 and connected to pull the holder 410 outward of the backrest frame 100. Optionally, the actuator may be implemented as a motor connected to pull the holder 410 outward of the backrest frame 100.

Since the elastic pressurizing member 500 elastically presses the upper front surfaces of the both side frames 110 and 120 held and tensioned by the tension member 400, the front and rear sides of the side frames due to the driving of the tension member 400 are stretched. It prevents the flow so that it does not move in the direction.

1 and 3, the elastic pressing member 500 includes a slider 520 having an elastic pressing cushion 510 and a slider 520 to elastically press the upper front surfaces of the frames 110 and 120 respectively. ) And a screw jack 530 for moving each of the forward and backward directions, a driving motor 540 for driving the screw jack 530, a driving motor 540 and a jack support 550 for supporting the screw jack 530. .

The slider 520 is installed to be movable in the front-rear direction on the jack support 550 to support an elastic pressing cushion 510 that elastically presses the upper front of the two side frames 110 and 120, such an elastic pressing cushion The 510 is made of a material having elasticity and elastically presses the front upper portions of the both side frames 110 and 120 formed in various shapes, so that the front and rear flows are prevented when the both frames 110 and 120 are stretched. One side of the slider 520 is provided with a bush or a bearing so that the end of the screw shaft 533 of the screw jack 530 to be described later is rotatably connected, so that it is moved together with the screw shaft 533 moving in the front and rear direction when rotating. . Sliding rails 521 are formed on the upper and lower surfaces of the slider 520 to slide along the guide rail 552 of the jack support 550 to be described later.

Screw jacks 530 are connected to move both sliders 520 in the front and rear directions, and these screw jacks 530 are rotatably installed in the case 531 and the case 531 so that the driving motor 540 A worm 532 connected to the drive shaft, a worm wheel (not shown) with a female screw (not shown) in the center by meshing with the worm 532, a screw shaft 533 that is screwed to the female screw of the worm wheel to move the slider 520 back and forth Includes. The screw jack 530 rotates the worm wheel meshed orthogonally as the worm 532 is rotated by the driving of the driving motor 540, and the screw shaft 533 is rotated by the rotation of the worm wheel to move in the front and rear direction. do.

The jack support 550 is fixed with support brackets 551 on both sides of the support plate 340 so as to firmly support both screw jacks 530 as shown in FIGS. 1 and 3. Screw jacks 530 are respectively installed on both jack supports 550, and guide rails 552 are formed on the upper and lower surfaces to guide the front and rear sliding of the sliding rails 521 provided in the slider 520, thereby The 520 prevents left and right flow when sliding back and forth.

The drive motor 540 drives any one screw jack 530, and the drive shaft of this drive motor 540 is connected to the worm 532 of the screw jack 530 to move the screw shaft 533 in the front and rear direction. Will be ordered.

And the worm 532 of both screw jacks 530 is connected to the connecting rod 560 to transfer the driving force of the driving motor 540 connected to the right screw jack 530 to the left screw jack 530 and at the same time, the left and right screw jacks The balance of 530 is maintained.

In addition, both sliders 520 are connected by a balance bar 570 to maintain a left and right balance when sliding back and forth.

The overall operational relationship of the present invention configured as described above will be described in detail with reference to the accompanying drawings.

First, as shown in FIG. 3, the lower portion of the backrest frame 100 to which the mesh sheet 200 is coupled is seated and fixed between the front jig 331 and the rear jig 332, and both sides frame 110 ( The upper rear surface of 120) is disposed to be supported by the holder 410 of the tension member 400.

Subsequently, the rotational force generated by the driving of the driving motor 540 is transmitted to the right screw jack 530, and the screw shaft 533 of the right screw jack 530 is rotated in the direction of the arrow in FIG. It is moved to press 120.

At this time, the rotational force of the right screw jack 530 is transmitted to the left screw jack 530 through the connecting rod 560.

Next, by driving the screw jack 530, the slider 520 slides forward, whereby the elastic pressing cushion 510 elastically presses the upper front surfaces of the both side frames 110 and 120.

Thereafter, as shown in Figs. 7 and 8, when the cylinder 420 is driven in the direction of the arrow, the holder 410 tensions both side frames 110 and 120 in the outward direction, at which time both frames 110 and 120 ) Is kept pressed by the elastic pressing member 500 so that it does not flow in the front and rear directions.

In this way, in a state in which the two side frames 110 and 120 are stretched outward, the fastening convex portions 141 of the finishing frame 140 are inserted into the fastening portions 150 of the two side frames 110 and 120, and the mesh sheet ( The back of the chair is completed with the tension of 200) maintained.

On the other hand, the method of manufacturing a chair back according to an embodiment of the present invention is a lower portion connecting both side frames 110 and 120 to which both ends of the mesh sheet 200 are coupled and the lower portions of the two side frames 110 and 120 The step of preparing the backrest frame 100 made of the frame 130 (S1), the step of fixing the lower part of the backrest frame 100 to the jig 330 (S2), the upper back of the two side frames 110, 120 Holding the holder 410 (S3), elastically pressing the upper front surfaces of the held both side frames 110 and 120 (S4), elastically pressing both side frames 110 and 120 The step of providing tension to the mesh sheet 200 by tensioning the upper part of the mesh sheet 200 (S5), the finishing frame at the upper end of the both side frames 110 and 120 to maintain the shape of the tensioned mesh sheet 200 ( 140) and fastening (S6).

In the backrest frame preparation step (S1), as described above, a backrest including the left and right side frames, the lower frame, and the mesh sheet is prepared.

In the fixing step (S2), the lower portion of the backrest frame 100 is seated and fixed between the front jig 331 and the rear jig 331.

In the holding step (S3), the upper rear surfaces of the two side frames 110 and 120 are held by the holder 410 of the tension member 400 described above.

In the pressing step (S4), the upper front surfaces of the both side frames 110 and 120 are elastically pressed using the elastic pressing member 500 described above.

In the step of applying tension (S5), the upper portions of the frames 110 and 120 are stretched outward using the tension member 400 described above, so that the mesh sheet 200 is tensioned to achieve a taut state. .

In the step of fastening the finishing frame (S6), the shape of the mesh sheet 200 to which tension is applied is maintained as it is by fastening the finishing frame 140 to the upper ends of the frames 110 and 120 on both sides.

The embodiments of the present invention described above are merely exemplary, and those of ordinary skill in the art to which the present invention pertains will appreciate that various modifications and other equivalent embodiments are possible.

Therefore, it will be appreciated that the present invention is not limited to the form mentioned in the detailed description above.

Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims. In addition, the present invention is to be understood as including the spirit of the present invention as defined by the appended claims and all modifications, equivalents and substitutes within the scope thereof.

100: back frame 110: left frame
120: right frame 130: lower frame
140: finishing frame 141: fastening convex
150: fastening part 200: mesh sheet
210: coupling bar 300: base member
310: base plate 320: leg
330: jig 331: front jig
332: rear jig 400: tension member
410: holder 420: cylinder
500: elastic pressing member 510: elastic pressing cushion
520: slider 521: sliding rail
530: screw jack 533: screw shaft
540: drive motor 550: jack support
560: connecting rod 570: balance bar

Claims (5)

A jig for fixing the lower portion of the backrest frame consisting of a lower frame connecting the lower frames of both sides of the mesh sheet and the two side frames coupled to each other, and the upper portions of the rear surfaces of the both side frames fixed with the jig are held and stretched outward. A tension member for imparting tension to the mesh sheet, and an elastic pressing member for elastically pressing the upper front surfaces of the both frames held and tensioned by the tension member
The tensioning member includes a holder formed in a'L' shape to support upper rear surfaces of the both side frames and hold the inner side surfaces, and an actuator that pulls the holder to the outside of the backrest frame to tension the upper portions of the both side frames, ,
The elastic pressing member includes a slider having an elastic pressing cushion to elastically press the upper front surfaces of the both side frames, a screw jack connected to move the slider in the front and rear directions, respectively, and a driving motor connected to drive the screw jack. , A jack support for supporting the driving motor and the screw jack, a guide rail formed on the inner upper and lower surfaces of the jack support, and a sliding rail provided on the slider so as to guide forward and backward sliding along the guide rail,
Each of the screw jacks is screwed to a case, a worm rotatably installed in the case and connected to the drive shaft of the drive motor, a worm wheel meshing with the worm and having a female screw at the center, and screwed to the female screw of the worm wheel to move the slider forward and backward. A moving screw shaft, a connecting rod connecting both sides of the worm so that the driving force of one screw jack is transmitted to the other screw jack, and a balance bar connecting both sides of the slider to maintain a left and right balance when sliding back and forth,
The jig includes a front jig and a rear jig installed at predetermined intervals on an upper portion of the base member to fix the lower portion of the backrest frame, and the base member comprises a base plate and a base plate on which the front jig and rear jig are installed. And a leg supported from, wherein the jack support is supported by support brackets connected to both sides of a support plate fixed to an upper surface of the base plate. delete delete delete delete

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