1. Field of the Invention
The present invention is related to an improved structure for a seat supporting frame of a chair, especially is related to having a horizontal a support, front leg, a vertical support piece, and a stop abutment to be held together secure and tightly, and thereby preventing the chair from loosening because of having a heavy people sitting in the chair.
2. The Prior Arts
With reference to
It is observed that the stop abutment C1 connected to the vertical support piece C of the front leg B would be fractured or moved to the outer portion of the horizontal support A easily, because of the seat D having to support a person with a heavy load, and the fact that typically people changing their sitting postures constantly. If the above situation is prolonged for an extended duration, the joining together between the seat D, the front leg B, and the back leg E of the chair will be loosened, so that the stop abutment of the chair abutting on the horizontal support A will be fractured and becomes useless. It is another disadvantage that the chair will not be folded smoothly towards the inner side of the front leg B when the stop abutment C1 is moved to the outside.
In addition, the horizontal support A of the typical conventional folding chair is formed with the two ends bent into a wavy shape. The wave crest section of one end is welded to the curled edge B1 along the circumference of the front leg B; and the wave trough section is extended and welded inside the channel B2 of the front leg B. The horizontal support A is connected to the front leg B by means of the two wavy shaped ends of the support. The welded portion between the horizontal support A and the front leg B is not flat but is curved; therefore, it is more difficulty to weld it than to weld flat surfaces, saying nothing of the worker's inadequate welding technique. As a result, some folding chairs may be of unacceptable quality. The horizontal support A would not able to support the seat D if it is loosened. Additionally, it is very dangerous for the person sitting if the stud C2 above the stop abutment C1 is loosened as well.
With reference to
According to the above disadvantage of the conventional folding chair, the inventor intends to improve the engaging and positioning structure between the stop abutment and the horizontal support. The two ends of a horizontal support at the back of a chair are formed with curved sections, respectively, so as to ensure that a stop abutment on the lower portion of a vertical support piece to not to move and bend towards the outer portion of the horizontal support resulting in all of the frame become distorted and loosened, or unable to be properly positioned due to the heavy load of a person sitting or people changing postures frequently. As a result, the chair is thereby completely damaged, become useless, and has its lifespan reduced.
Based upon the aforementioned, the present invention intends to solve two problems. One is to ensure the stop abutment to not move or bend from the out side of the horizontal support for resulting in inclining and fracturing because of people's changes in posture. The other problem to be solved is to ensure the stop abutment to be consistently firmly abutting against the inner portion of the curved section on the two ends of the horizontal support for the proper support, balancing, and placement on the horizontal support. The method to solve the problems is as follows.
First, a horizontal support is designed. And the two ends of the horizontal support are made to be flattened and bent to form a curved section, in which the outside surface of the folded bent section is flat, and can be evenly welded on the inner side of the two long beams of the front leg so as to solve the problem that the support to dislodge from the front leg. The horizontal support is mounted horizontally below the seat, and the two ends that are bent end sections are both each formed to a curved section, respectively.
A vertical support piece is riveted onto the seating frame by means of a stud, and the upper section of the vertical support piece is welded on the inner side of a front leg. A stop abutment is extended along the lower part of the vertical support piece, which can be firmly abutted against the inside edge of the curved section on the two ends of the horizontal support and is not overextending past the curved section, when the chair is unfolded. Because the space between the curved section of the horizontal support and the edge surface of the seat is small, the stop abutment, which is firmly abutted and positioned on the horizontal support, has only a small offset gap; therefore, the stop abutment would only shift a tiny amount of distance, and would not move past the surface of the curved section of the horizontal support even when the chair is to be supporting a very heavy load, or that the user on the chair changes his posture again and again.
For the horizontal support according to the present invention because of having flat surfaces at the two ends, it is easier to weld the horizontal support with the front leg and to weld more tightly than the conventional horizontal support, whose two ends extend to the front leg and must be welded along the curled edge of the front leg. The welding technique for the conventional horizontal support is difficult, and the welded part is not very firm. In addition, the raised curved surface formed at the curved section at the end of the horizontal support according to the present invention can prevent the stop abutment from moving beyond the outside of the ends. Compared to the horizontal support in the present invention, the conventional horizontal support does not have the curved section, and the stop abutment would shift, tilt, and move toward the outer sides of the front leg when the user is moving frequently on the chair. Thus the entire seating frame will be loosened, and would be unsuitable for sitting. In more severe cases, the curled edge may even be fractured, and cannot be positioned and firmly abutted against the horizontal support. As a result, the chair is no longer usable, and has its lifespan reduced.
The loosening and sliding due to the horizontal support and the stop abutment moving passing the outside may not have occurred instantly, but instead can be accumulated over a longer period of time. Furthermore, the loosening can also be due to the user on the chair changing his postures more frequently. As a result, the user's safety must be considered in order to avoid accidents during the manufacturing process of the chair.
The present invention will be apparent to those skilled in the art by reading the following detailed description of a preferred embodiment thereof, with reference to the attached drawings, in which:
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The present invention will be apparent to those skilled in the art by reading the following detailed description of a preferred embodiment and those skilled in the art can operate it according to the reference.
The present invention relates to an improved structure for a seat supporting frame of the folding chair.
The inventor mainly improves the abutting structure of the horizontal support 14 and the vertical support piece 15 in order to solve the dislocation problem of the supporting spot because of excessive load on the chair.
With Reference to
Although the present invention has been described with reference to the preferred embodiment thereof, it is apparent to those skilled in the art that a variety of modifications and changes may be made without departing from the scope of the present invention which is intended to be defined by the appended claims.
Number | Name | Date | Kind |
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2247236 | Johannsen | Jun 1941 | A |
2548098 | Clarin | Apr 1951 | A |
2675062 | Clarin | Apr 1954 | A |
2982339 | Clarin | May 1961 | A |
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4319779 | Leonhart | Mar 1982 | A |
4564212 | Orlandino et al. | Jan 1986 | A |
6478375 | Richardson | Nov 2002 | B2 |