LOWER-BACK SUPPORTING STRUCTURE FOR A BED OR A CHAIR
A lower-back supporting structure for a bed or a chair includes a sliding base, two scissor lifts, a driver and a supporting member. The sliding base has a pair of slide slots and a pair of rotating pins, a securing portion between the two rotating pins, and a plurality of the locking apertures. Two scissor lifts both have an X-shaped frame having a pivot. A driver has a positioning end, an extendable rod, a through hole and a sliding rod placed through the slide slot, the through hole and the first front cotter holes. A supporting member has a pair of slide tracks and a pair of rotating holes. The driver drives the sliding rod along the slide slot of the sliding base to shorten the extendable rod, the scissor lifts rotate around the pivots to lift such that the supporting member is pushed away from the sliding base.
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1. Field of the Invention
The present invention relates to a lower-back supporting structure for a bed or a chair, and more particularly to a lower-back supporting assembly that provides lower-back support to improve the comfort afforded by a bed frame or chair, which employs scissor lifts that are capable of a scissoring movement to increase the lift height of the supporting member, thereby providing a lower-back supporting structure that can help users suffering from lower-back pain.
2. Description of the Related Art
Currently, most bed frames are designed for a user to lay flat while sleeping, and a typical bed frame includes four legs and supports. However, due to the stresses of modern life, many people suffer from insomnia and therefore suffer from a lack of sufficient rest. Consequently, many bed frames have included additional features, such as providing head or leg lifting capabilities, and the user can select and adjust a suitable position for him or herself. However, these prior art bed frames all lack a lower-back support function. The lower-back of the human body supports the upper-body weight and has a concaved shape, which is the narrowest portion in the upper body; therefore, the lower-back endures tremendous pressure. If, when the user is laying flat, his or her lower-back is not supported by the bed surface, the user cannot experience the most comfortable posture or release the stresses around the lower-back.
Some typical chairs have lower-back support structures, but the user must manually do the adjustment. The prior structure utilizes an elastic sheet to provide support to a back board, and the back board is attached to a string. With a tightening rotation or release of the string, the back board is placed in different positions to provide lower-back support. However, the prior art lower-back support structure requires manual operation which is inconvenient, and the elastic sheet cannot provide sufficient support height.
Therefore, it is desirable to provide a lower-back supporting structure for a bed or a chair to mitigate and/or obviate the aforementioned problems.
SUMMARY OF THE INVENTIONAn objective of the present invention is to provide a lower-back supporting structure for a bed or a chair.
In order to achieve the above-mentioned objective, a lower-back supporting structure for a bed or a chair comprises a sliding base, two scissor lifts, a driver and a supporting member. The sliding base is a rectangular frame, and front ends and rear ends of two length-wise sides respectively have a pair of slide slots and a pair of rotating pins. Each slide slot is an elongate slot having an inner arcuate region and an outer arcuate region at two respective ends. A securing portion is disposed on a down-extended portion between the two rotating pins, and the sliding base includes a plurality of locking apertures. The two scissor lifts both are an X-shaped frame having a pivot; two bottom ends of each has a first front cotter hole and a rear cotter hole, and two top ends of each has a second front cotter hole and rear rotating pin. The first front cotter hole of each scissor lift is aligned with the slide slot of the sliding base, the rear cotter hole of each scissor lift is pivoted to the rotating pin, and a sliding pin is placed through the two second front cotter holes of the two scissor lifts. A first spacer tube and a first pair of washers are jacketed on the sliding pin. The driver is an electric motor or a hydraulic device. The driver has a positioning end; the positioning end is pivoted to the securing portion of the sliding base, and the securing portion of the sliding base and the positioning end of the driver are pivoted together by a pin. Another end of the driver has an extendable rod and a through hole disposed at an end of the extendable rod. The through hole is aligned with the slide slot of the sliding base. A sliding rod is placed through the slide slot, the through hole and the first front cotter holes. Furthermore, two second spacer tubes and a second pair of washers are jacketed on the sliding rod among the slide slot, the through hole and the first front cotter holes. Therefore, the driver and the sliding base are capable of moving relative to each other. A supporting member has four corners corresponding to the four top ends of the two scissor lifts, a pair of slide tracks and a pair of rotating holes; each slide track corresponds with the sliding pin, and each rotating hole is pivoted to a corresponding rear rotating pin. Subsequently, the driver drives the sliding rod along the slide slot of the sliding base to shorten the extendable rod, the scissor lifts rotate around the pivots to lift such that the supporting member is pushed away from the sliding base.
When the extendable rod of the driver is extended, the extendable rod pushes the sliding rod towards the outer arcuate regions of the slide slots, and the first front cotter holes of the scissor lifts are pushed in the same direction so the scissor lifts rotate around their pivots. A maximum distance between the first front cotter hole and the rear cotter hole is then reached. Alternatively, when the extendable rod of the driver contracts, the through hole of the extendable rod pulls the sliding rod to slide towards the inner arcuate regions of the slide slots, and with the sliding rod being pivoted to the first front cotter holes of the scissor lifts the sliding rod simultaneously pulls the first front cotter holes to slide towards the rear cotter holes. Meanwhile, the scissor lifts rotate around their pivots, and a minimum distance between the first front cotter holes and the rear cotter holes is then reached. Additionally, the second front cotter holes and the rear rotating pins of the scissor lifts also move to closer to each other. The rear rotating pins are pivoted on the rotating holes of the supporting member, and the rear rotating pins of the scissor lifts lift the ends having the rotating holes of the supporting member. The second front cotter holes with the sliding pin slides and pushes against the slide track of the supporting member. Therefore, with the contraction of the driver and the simultaneous rotation of the scissor lifts, the supporting member is able to lift up while remaining horizontal.
The lower-back supporting structure utilizes the driver to push the sliding rod along the slide slots, and with the scissoring movement of the scissor lifts the supporting is lifted horizontally. This simple assembly structure can provide lower-back support to improve the comfort of the bed frame or chair. Moreover, the scissor lifts both are an X-shaped frame and capable of scissoring movement around the pivots to increase the lift height of the supporting member. Therefore, the lower-back supporting structure can help users to ease their lower-back pain.
Other objects, advantages, and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
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With the above-mentioned structure, the following benefits can be obtained: the lower-back supporting structure 100 utilizes the driver 30 to push the sliding rod 34 along the slide slots 11, and with the scissoring movement of the scissor lifts 20 the supporting 40 is lifted horizontally. This simple assembly structure can provide lower-back support to improve the comfort of the bed frame 50 or chair. Moreover, the scissor lifts 20 both are an X-shaped frame and capable of scissoring movement around the pivots 21 to increase the lift height of the supporting member 40. Therefore, the lower-back supporting structure 100 can help users to ease their lower-back pain.
Although the present invention has been explained in relation to its preferred embodiment, it is to be understood that many other possible modifications and variations can be made without departing from the spirit and scope of the invention as hereinafter claimed.
Claims
1. A lower-back supporting structure for a bed or a chair comprising:
- a sliding base forming a rectangular frame, front ends and rear ends of two length-wise sides respectively having a pair of slide slots and a pair of rotating pins, a securing portion disposed on a down-extended portion between the two rotating pins, and the sliding base including a plurality of the locking apertures;
- two scissor lifts both forming an X-shaped frame having a pivot, two bottom ends of each having a first front cotter hole and a rear cotter hole, two top ends of each having a second front cotter hole and rear rotating pin, the first front cotter hole of each scissor lift aligned with the slide slot of the sliding base, the rear cotter hole of each scissor lift pivoted to the rotating pin, and a sliding pin is placed through the two second front cotter holes of the two scissor lifts;
- a driver having a positioning end, the positioning end pivoted to the securing portion of the sliding base, another end of the driver having an extendable rod and a through hole disposed at an end of the extendable rod, the through hole aligned with the slide slot of the sliding base; and a sliding rod is placed through the slide slot, the through hole and the first front cotter holes; and
- a supporting member having four corners corresponding to the four top ends of the two scissor lifts, a pair of slide tracks and a pair of rotating holes, each slide track corresponding to the sliding pin, and each rotating hole pivoted to the rear rotating pins;
- wherein the driver drives the sliding rod along the slide slot of the sliding base to shorten the extendable rod, the scissor lifts rotate around the pivots to lift such that the supporting member is pushed away from the sliding base.
2. The lower-back supporting structure for a bed or a chair as claimed in claim 1, wherein the slide slot is an elongate slot having an inner arcuate region and an outer arcuate region at two respective ends.
3. The lower-back supporting structure for a bed or a chair as claimed in claim 1, wherein the securing portion of the sliding base and the positioning end of the driver are pivoted together.
4. The lower-back supporting structure for a bed or a chair as claimed in claim 1, wherein the driver is an electric motor.
5. The lower-back supporting structure for a bed or a chair as claimed in claim 1, wherein the driver is a hydraulic device.
6. The lower-back supporting structure for a bed or a chair as claimed in claim 1, wherein a first spacer tube and a first pair of washers are jacketed on the sliding pin between the two slide tracks of the supporting member.
7. The lower-back supporting structure for a bed or a chair as claimed in claim 1, wherein at least two second spacer tubes and a second pair of washers are jacketed on the sliding rod among the slide slot, the through hole and the first front cotter hole.
8. The lower-back supporting structure for a bed or a chair as claimed in claim 1, wherein a soft padding is disposed on the supporting member.
Type: Application
Filed: Nov 2, 2009
Publication Date: May 5, 2011
Applicant: RUOEY LUNG ENTERPRISE CORP. (LUKANG TOWN)
Inventor: Lung-Tan Shih (LUKANG TOWN)
Application Number: 12/610,372
International Classification: A47C 7/46 (20060101); A47C 3/00 (20060101); A47C 16/00 (20060101); A47C 21/00 (20060101); A47C 31/00 (20060101);