Patent Application
20120272504
The present invention relates to a method for fastening strips to leisure chairs and particularly to a method for fastening strips to a frame of a leisure chair.
These days increasing of living standard has made people to raise even higher expectation on life quality. To improve comfort and aesthetic appeal at home, many people don't hesitate to purchase various types of household goods, including a wide variety of furniture, such as sofas, chairs and the like. Chairs are some of indispensable furniture to provide comfort for people in the houses, offices and leisure activities.
There are myriad types of chairs on the market with different structures made according to different functions or requirements. Take leisure chairs for instance, R.O.C. patent No. 488244 provides a chair that can be stacked over one another. It mainly has a frame including a seat and a backrest with a plurality of elastic strips fastened to the frame so that resilient support can be provided to the back or the hip of a user to enhance comfort during sitting.
Referring to
1. In general, the distal ends of the strip is wound on the outmost layer, but the distal ends of the strip 20 of the aforesaid leisure chair is wound on the inmost layer during the second winding, which creates difficulty in assembly. As a result, production speed of the leisure chair is adversely affected.
2. Before winding of the strip 20 is performed for the second time, the strip 20 has to be stretched to the side tube 10 at another side. Every worker exerts different stretching forces, hence each strip 20 is stretched with various degree of forces. As a result, each strip 20 has different tensions that also affect sitting comfort and impact product quality.
The primary object of the present invention is to solve the problems of the conventional method that winding and fastening strips to leisure chairs are difficult and time-consuming and also result in uneven tensions on the strips and impact sitting comfort.
To achieve the foregoing object, the present invention provides a method for fastening strips to leisure chairs that mainly includes steps of: first, preparing a plurality of strips and a frame of a leisure chair with two side tubes, each side tube including one end connected to a coupling tube; second, bending inversely two ends of each strip towards the center and fastening the two ends to the strip to form respectively a coupling opening at the two ends; third, heating and softening the strips; then coupling the softened strip on the two side tubes through the coupling openings; and finally bridging a support tube to another two ends of the two side tubes opposite to the coupling tube to stretch the strips coupled on the two side tubes to finish fastening.
According to an embodiment of the invention, each strip is made of PVC with two ends fastened to the strip by high-frequency welding to form the coupling openings. To facilitate stretching and coupling on the two side tubes, the strips are submerged in hot water for heating and softening. Another two ends of the two side tubes opposite to the coupling tube can be expanded through a pneumatic cylinder driving machine to couple with the support tube. The two side tubes also have respectively an insertion hole on corresponding sides for holding the support tube.
The foregoing, as well as additional objects, features and advantages of the invention will be more readily apparent from the following detailed description, which proceeds with reference to the accompanying drawings.
The present invention aims to provide a method for fastening strips to leisure chairs that mainly fastens strips 40 to a leisure chair to support sitting of a user. Please refer to
Next, preparing a plurality of elongated strips 40, and each of which is made of PVC. Each strip 40 is formed at a length slightly greater than the interval between the two side tubes 31. Then, proceeding to step S2 to fasten the strips 40 to the frame 30. First, bending inversely two ends 41 of each strip 40 towards the center (as shown in
Then proceeding to step S3, submerging the strip 40 with the coupling openings 42 in hot water for heating and softening (referring to
Finally, proceeding to step S5, stretching the two side tubes 31 through a pneumatic cylinder driving machine 60 to return to the original interval between the two side tubes 31 and bridging a support tube 33 to the two side tubes 31. As shown in the drawings, the two side tubes 31 have respectively an insertion hole 311 on two corresponding sides to be inserted by the support tube 33 after the two side tubes 31 are stretched by the pneumatic cylinder driving machine 60. Thereby the two side tubes 31 are braced to stretch the strips 40 (referring to
Also referring to
In short, the invention mainly changes the conventional winding and fastening approach by forming the coupling openings 42 at two ends of each strip 40 first, and then the strip 40 is heated and softened to directly couple on the two side tubes 31 through the coupling openings 42. Finally, the two side tubes 31 are braced through the support tube 33 to stretch the strips 40 between them. Compared with the conventional technique, the present invention provides many advantages, notably:
1. Assembly can be done quickly to greatly reduce assembling time and increase production speed and quantity of leisure chairs.
2. Each strip 40 receives substantially the same force and forms a uniform tension, thus improves sitting comfort.
While the preferred embodiment of the invention has been set forth for the purpose of disclosure, modifications of the disclosed embodiment of the invention as well as other embodiments thereof may occur to those skilled in the art. Accordingly, the appended claims are intended to cover all embodiments which do not depart from the spirit and scope of the invention.
