Electric and Mechanical Stretching Apparatus for Movable Sofa

The application is a continuation of U.S. application Ser. No. 16/900,305, filed on Jun. 12, 2020, which is re-issue of U.S. application Ser. No. 14/781,567, filed on Sep. 30, 2015, which is a national phase application of PCT/CN2014/075457, filed on Apr. 16, 2014, which is based upon and claims priority to CN201310719702.0, filed on Dec. 24, 2013. The entire contents of the applications above are hereby incorporated by reference for all purposes.

The present disclosure relates to an electromechanical stretching apparatus of a convertible sofa, and in particular, to a multi-function electromechanical stretching apparatus of a convertible sofa, where a leg can be folded or unfolded, and the angle of a back can be adjusted to a certain degree.

At present, existing electromechanical stretching apparatuses of convertible sofas have four major disadvantages as follows: 1. a convertible sofa on the market has an excessively complex electrically-driven structure, thereby affecting kinetic energy efficiency of a motor; 2. an electrically-driven convertible sofa on the market may shake, so that comfort of the convertible sofa is affected; 3. installation of an electrically-driven convertible sofa on the market is complex, thereby affecting installation efficiency of the convertible sofa; 4. in an electrically-driven convertible sofa on the market, a motor head protrudes from an electrically-driven connecting rod, so that interference may occur when a leg part is completely folded, thereby affecting functions and structural stability of the sofa. Referring to, an electric actuator of an electrically-driven convertible sofa on the market according to the prior art, includes an electrically-driven square tube, an electrically-driven angle iron, a transmission part, a transmission fixed support, a comparison motor head fixing part(the “comparison” herein is used for distinguishing from the embodiment, the same below), a comparison motor connecting tube, a motor fixing part, a motor tail fixing part, a comparison motor movable slider, a comparison motor, a rotor shaft transmission part, a rotary connecting rod, and a comparison electrically-driven connecting rod, where a front end and a rear end of the comparison motorneed to be respectively fastened on the comparison motor connecting rodand the comparison electrically-driven connecting rod, and the transmission part, the transmission fixed supportand the motor fixing partare combined as an electrically-driven rotary connecting part, so that liner movement of the comparison motor movable slideron the comparison motoris transformed to rotary movement of the electrically-driven square tubeand the electrically-driven angle iron, thereby driving the rotor shaft transmission partand the rotary connecting rodon the electrically-driven square tubeto rotate, and then actuating movement of the mechanical stretching apparatus. Iron support self-locking may occur during rotation of the rotor shaft transmission partand the rotary connecting rod, thereby causing a problem of shaking of an original electrically-driven convertible sofa. The present disclosure provides improvement on the basis of the prior art as mentioned above.

The present disclosure provides a mechanical stretching apparatus of a convertible sofa featuring a simple structure, convenient use and a novel electrically-driven function, so as to solve a technical problem, namely, overcome the foregoing disadvantages in the prior art.

To solve the above technical problem, the present disclosure adopts the following technical solution: An electromechanical stretching apparatus of a convertible sofa is provided, consisting of a mechanical stretching apparatus and an electric actuator, the mechanical stretching apparatus being provided with an electrically-driven connecting rod, where the electric actuator consists of a motor, a motor connecting tube, a motor movable slider, and a motor head fixing part, the motor adopted is a motor with a guide rail, the motor movable slider is installed on the guide rail of the motor, the motor head is rotationally connected through a second rotor shaft to the motor head fixing part fastened on the electrically-driven connecting rod, the motor connecting tube is connected to the motor movable slider through a first rotor shaft and the motor connecting tube is fastened on the mechanical stretching apparatus.

In the present disclosure, the motor connecting tube is fastened on a linkage part of the mechanical stretching apparatus.

In the present disclosure, the first rotor shaft and the second rotor shaft are both a bolt.

In the present disclosure, the motor-driven manner features a simple structure, which facilitates improving kinetic energy efficiency of the motor.

In the present disclosure, the electromechanical stretching apparatus has a simple structure, which facilitates improving installation efficiency of the mechanical stretching apparatus.

The present disclosure solves a problem of shaking of an electrically-driven convertible sofa on the market, thereby improving comfort of the convertible sofa.

In the present disclosure, the motor is installed conveniently, where a motor movable slider on the motor is connected to a motor head by means of bolt connection, thereby greatly improving installation and maintenance efficiency of the motor.

The present disclosure solves a problem that in an electrically-driven convertible sofa on the market, a motor head protrudes from an electrically-driven connecting rod, thereby avoiding interference occurring when a leg part is completed folded, and improving structural stability of the convertible sofa.

In the present disclosure, a convertible sofa is additionally provided with an electrically-driven function, which facilitates development of sofa styles, increases automaticity and comfort of the convertible sofa, and improves installation, removal, maintenance, and operation efficiency of an electric actuator of the convertible sofa.

The following further describes the present disclosure with reference to embodiments and the accompanying drawings.

In an embodiment of the present disclosure, an electromechanical stretching apparatus of a convertible sofa includes a mechanical stretching apparatus in the prior art (having a same left side component and right side component, where the left side component is connected to the right side component in a fixed manner by using a fixing part, for example, as described in US200920200532.4, Patent Publication No. 102657449A, and Patent No. 201220668439.8), the mechanical stretching apparatus being installed with an electrically-driven connecting rod, and has the following structural features: an electric actuator consists of a motor, a motor connecting tube, a motor movable sliderand a motor head fixing part, the motor adopted is a motor with a guide rail, a motor head is rotationally connected through a second rotor shaftto the motor head fixing partfastened on the electrically-driven connecting rod, the motor connecting tubeis fastened through a bolt on a linkage partof the mechanical stretching apparatus (the linkage partis a connecting part used for fixing and transmission in a mechanical stretching apparatus of the prior art, for example, a linkage part as described in Patent No. 200920200532.4, a linkage part as described in Patent Publication No. 102657449A, and a seat supportas described in US201220668439.8, and in some documents, another name such as a transmission connecting part may also be adopted), the motor connecting tubeis rotationally connected to the motor movable sliderthrough a first rotor shaft, and the motor movable slidermoves on the guide railof the motor.

In this embodiment of the present disclosure, the motor movable slidermoves along the guide railof the motor, so that a driving force of the motoris consistent to a greatest degree with an unfolding direction in this embodiment, thereby saving energy, reducing mechanical wear and strengthening overall structure.

In this embodiment, the motion principle is that the motor connecting tuberotationally connected to the motor movable sliderthrough the first rotor shaftis driven by forward movement (toward left side of) of the motor movable slideron the motoralong the guide railof the motor, where a motor head is rotationally connected through the second rotor shaftto the motor head fixing partfastened on the electrically-driven connecting rod, and the motor connecting tubeis fastened on the linkage partof the mechanical stretching apparatus. Due to personal weight and an acting force of the motor connecting tubedriven by the motor movable slider, a leg structure of the mechanical stretching apparatus is unfolded first, and when being fully unfolded to a limit and contacting with a contact surface, the leg structure is prevented from being mechanically unfolded, thereby driving a back structure of the electromechanical stretching apparatus of a convertible sofa to incline horizontally, so that the electromechanical stretching apparatus of a convertible sofa performs a procedure of transformation from a state shown in, to a state shown inand then to a state shown in. On the contrary, when the motor movable slidermoves reversely (backward, namely, toward right side of), the electromechanical stretching apparatus of a convertible sofa can perform a procedure of transformation from the state shown in, to the state shown in, and then to the state shown in. When the electromechanical stretching apparatus of a convertible sofa returns to the state shown inagain, that is, the leg part is completely folded, a complete procedure for electrically driving the electromechanical stretching apparatus of a convertible sofa is implemented.

In this embodiment, a manner of rotational connection of the first rotor shaftand the second rotor shaftis achieved by means of bolt connection, thereby achieving bolt connection of the motor; and the motor connecting tubeis fastened on the linkage partof the mechanical stretching apparatus by using a bolt, which facilitates installation, removal and maintenance of the motor.

In this embodiment, rotational connection of the rotor shaft transmission partand the rotary connecting rodis removed, so as to solve a problem of shaking in an electrically-driven manner.

In this embodiment, a novel electrically-driven manner of a convertible sofa is additionally provided, while an original electrically-driven apparatus is removed, which facilitates improving installation, removal, maintenance and operation efficiency of an electric actuator of the convertible sofa, and increasing automaticity and comfort of the sofa.

It should be recognized that, any simple modification or equivalent change made to the present disclosure shall fall within the protection scope of the present disclosure.