Base seat for bed or chair

Abstract

A base seat, which is adapted for being used with a bed or a chair, includes a fixation base, a rocking mount, a drive device, and a swivel mount. The rocking mount is disposed above the fixation base and reciprocatingly and inclinedly moveable relative to the fixation base. The drive device is disposed between the fixation base and the rocking mount to drive the rocking mount to reciprocatingly and inclinedly move relative to the fixation base. The swivel mount is disposed above the rocking mount and rotatable relative to the rocking mount. By rotating the swivel mount and driving the rocking mount to reciprocatingly and inclinedly move, the bed or chair, which is fixedly mounted to the swivel mount, is swingable in a desired direction.

What is claimed is: 
     
         1 . A base seat for being used with a bed or a chair, the base seat comprising:
 a fixation base;   a rocking mount disposed above the fixation base in a way that the rocking mount is reciprocatingly and inclinedly moveable relative to the fixation base;   a drive device disposed between the fixation base and the rocking mount to drive the rocking mount to reciprocatingly and inclinedly move relative to the fixation base; and   a swivel mount disposed above the rocking mount in a way that the swivel mount is rotatable relative to the rocking mount.   
     
     
         2 . The base seat of  claim 1 , wherein the rocking mount comprises a pivot portion, and the swivel mount comprises a coupling portion coupled with the pivot portion of the rocking mount. 
     
     
         3 . The base seat of  claim 1 , further comprising an actuator having two ends pivotally connected with the rocking mount and the swivel mount, respectively. 
     
     
         4 . The base seat of  claim 1 , wherein the swivel mount comprises an abutment portion, and the rocking mount is disposed with at least one sliding contact member in contact with the abutment portion of the swivel mount; whereby the swivel mount is smoothly rotatable relative to the rocking mount. 
     
     
         5 . The base seat of  claim 1 , wherein the rocking mount comprises an abutment portion, and the swivel mount is disposed with at least one sliding contact member in contact with the abutment portion of the rocking mount; whereby the swivel mount is smoothly rotatable relative to the rocking mount. 
     
     
         6 . The base seat of  claim 1 , wherein the fixation base comprises a bottom portion and a plurality of rollers disposed above the bottom portion; the rocking mount comprises a bearing portion and an arc rail, which is located under the bearing portion and in contact with the rollers. 
     
     
         7 . The base seat of  claim 6 , wherein the rollers comprise at least two lower rollers, which are located under the arc rail, and one upper roller located above the arc rail and between the two lower rollers. 
     
     
         8 . The base seat of  claim 7 , wherein the fixation base comprises two supporting arms upwardly extending from the bottom portion of the fixation base; the upper roller is rotatably disposed between the two supporting arms, and the arc rail of the rocking mount extends through a space between the two supporting arms. 
     
     
         9 . The base seat of  claim 1 , wherein the drive device comprises a power source, a crank and a link; the power source is disposed to the fixation base and provided with a power output shaft; the crank has an end connected with the power output shaft; the link has two ends pivotally connected with the crank and the rocking mount, respectively. 
     
     
         10 . The base seat of  claim 1 , wherein the fixation base comprises a bottom portion and an arc rail disposed above the bottom portion; the rocking mount comprises a bearing portion and a plurality of rollers, which are located under the bearing portion and in contact with the arc rail. 
     
     
         11 . The base seat of  claim 10 , wherein the rollers comprise at least two upper rollers, which are located above the arc rail, and one lower roller located under the arc rail and between the two upper rollers. 
     
     
         12 . The base seat of  claim 1 , wherein the swivel mount is omitted.