Adjustable support and bedstead having same

Abstract

Disclosed are adjustable supports and bedsteads. An adjustable support includes an inner bar with one or more cuts and an outer tubular bar with a slot. The inner and outer bars are movably coupled with each other. The adjustable support also includes a mechanism coupled with the outer bar at a position corresponding to the slot of the outer bar. When a cut of the inner bar is aligned with the slot of the outer bar, the mechanism engages with both the cut of the inner bar and the slot of the outer bar, and thus restricts the inner and outer bars from moving with respect to each other.

1 . An adjustable support comprising:
 an outer tubular bar comprising a first end, a second end, and a slot between the first and second ends of the outer tubular bar;   an inner bar slidably coupled with the outer tubular bar, the inner bar comprising a first end, a second end, and a first cut between the first and second ends of the inner bar, wherein the first end of the inner bar is inserted into the outer tubular bar through the second end of the outer tubular bar;   a locking/unlocking mechanism comprising:
 a retainer comprising a groove with an opening to receive the outer tubular bar, wherein a portion of the retainer adjacent the opening of the groove is aligned with the slot of the outer tubular bar; 
 an elastic member disposed at a bottom of the groove of the retainer, the elastic member abutting the outer tubular bar to push the outer tubular bar away from the retainer; and 
 a fastener fixedly coupled with the portion of the retainer adjacent the opening of the groove, wherein a stem portion of the fastener is disposed at the slot of the outer tubular bar and crosses the outer tubular bar such that when the first cut of the inner bar aligns with the slot of the outer tubular bar, the stem portion of the fastener seats at the first cut of the inner bar and the slot of the outer tubular bar, thereby restricting the inner bar and the outer tubular bar from moving with respect to each other 
 wherein the retainer comprises a protrusion at a bottom of the retainer to hold the elastic member. 
   
     
     
         2 . The adjustable support of  claim 1 , wherein the inner bar comprises a second cut between the first end and the first cut of the inner bar, wherein when the second cut of the inner bar aligns with the slot of the outer tubular, the stem portion of the fastener seats at the second cut of the inner bar and the slot of the outer tubular bar, thereby restricting the inner bar and the outer tubular bar from moving with respect to each other. 
     
     
         3 . (canceled) 
     
     
         4 . The adjustable support of  claim 1 , wherein the retainer has a substantially U-shape cross section. 
     
     
         5 . The adjustable support of  claim 1 , wherein the outer tubular bar has a substantially oblong cross section, and the inner bar has a substantially rectangular cross section. 
     
     
         6 . The adjustable support of  claim 1 , wherein the slot of the outer tubular bar is formed at a position proximal to the second end of the outer tubular bar. 
     
     
         7 . The adjustable support of  claim 1 , wherein the fastener includes a bolt, a pin, a latch, a shaft, or a bar. 
     
     
         8 . The adjustable support of  claim 1 , further comprising a guide coupled with the second end of the outer tubular bar to guide insertion of the inner bar into the outer tubular bar or movement of the inner bar with respect to the outer tubular bar. 
     
     
         9 . The adjustable support of  claim 8 , wherein the guide comprises:
 an opening with has a cross section shaped substantially the same as a cross section of the inner bar; and   one or more elastic pieces, each with a retention to fit with a hole formed at or adjacent the second end of the outer tubular bar.   
     
     
         10 . A bedstead comprising:
 a bed frame;   a leg assembly pivotally connected with the bed frame; and   one or more adjustable supports, each comprising:
 an outer tubular bar comprising a first end, a second end, and a slot between the first and second ends of the outer tubular bar; 
 an inner bar slidably coupled with the outer tubular bar, the inner bar comprising a first end, a second end, and a first cut between the first and second ends of the inner bar, wherein
 the first end of the inner bar is inserted into the outer tubular bar through the second end of the outer tubular bar; and 
 of the first end of the outer tubular bar and the second end of the inner bar, one is pivotally connected with the bed frame, and the other is pivotally connected with the leg assembly; 
 
 a locking/unlocking mechanism comprising:
 a retainer comprising a groove with an opening to receive the outer tubular bar, wherein a portion of the retainer adjacent the opening of the groove is aligned with the slot of the outer tubular bar; 
 an elastic member disposed at a bottom of the groove of the retainer, the elastic member abutting the outer tubular bar to push the outer tubular bar away from the retainer; and 
 a fastener fixedly coupled with the portion of the retainer adjacent the opening of the groove, wherein a stem portion of the fastener is disposed at the slot of the outer tubular bar and crosses the outer tubular bar such that when the first cut of the inner bar aligns with the slot of the outer tubular bar, the stem portion of the fastener seats at the first cut of the inner bar and the slot of the outer tubular bar, thereby restricting the inner bar and the outer tubular bar from moving with respect to each other and accordingly restricting the leg assembly and the bed frame from rotating with respect to each other 
 wherein the retainer comprises a protrusion at a bottom of the retainer to hold the elastic member. 
 
   
     
     
         11 . The bedstead of  claim 10 , wherein the first end of the outer tubular bar is pivotally connected with the bed frame, and the second end of the inner bar is pivotally connected with the leg assembly. 
     
     
         12 . The bedstead of  claim 10 , wherein when the first cut of the inner bar aligns with the slot of the outer tubular, the leg assembly is unfolded with respect to the bed frame. 
     
     
         13 . The bedstead of  claim 10 , wherein the inner bar comprises a second cut between the first end and the first cut of the inner bar, wherein when the second cut of the inner bar aligns with the slot of the outer tubular, the stem portion of the fastener seats at the second cut of the inner bar and the slot of the outer tubular bar, thereby restricting the inner bar from moving with respect to the outer tubular bar and accordingly restricting the leg assembly from rotating with respect to the bed frame. 
     
     
         14 . The bedstead of  claim 10 , wherein when the second cut of the inner bar aligns with the slot of the outer tubular, the leg assembly is folded onto the bed frame. 
     
     
         15 . (canceled) 
     
     
         16 . The bedstead of  claim 10 , wherein the outer tubular bar has a substantially oblong cross section, and the inner bar has a substantially rectangular cross section. 
     
     
         17 . The bedstead of  claim 10 , wherein the slot of the outer tubular bar is proximal to the second end of the outer tubular bar. 
     
     
         18 . The bedstead of  claim 10 , wherein the fastener includes a bolt, a pin, a latch, a shaft, or a bar. 
     
     
         19 . The bedstead of  claim 10 , wherein each adjustable support further comprises a guide coupled with the second end of the outer tubular bar to guide insertion of the inner bar into the outer tubular bar or movement of the inner bar with respect to the outer tubular bar. 
     
     
         20 . The bedstead of  claim 19 , wherein the guide comprises:
 an opening with has a cross section shaped substantially the same as a cross section of the inner bar; and   one or more elastic pieces, each with a retention to fit with a hole formed at or adjacent the second end of the outer tubular bar.   
     
     
         21 . An adjustable support comprising:
 an outer tubular bar comprising a first end, a second end, and a slot between the first and second ends of the outer tubular bar;   an inner bar slidably coupled with the outer tubular bar, the inner bar comprising a first end, a second end, and a first cut between the first and second ends of the inner bar, wherein the first end of the inner bar is inserted into the outer tubular bar through the second end of the outer tubular bar;   a locking/unlocking mechanism comprising:
 a retainer comprising a substantially rectangular base having four sides, two of the four sided extended to form a groove with an opening to receive the outer tubular bar, wherein a portion of the retainer adjacent the opening of the groove is aligned with the slot of the outer tubular bar; 
 an elastic member disposed at a bottom of the groove of the retainer, the elastic member abutting the outer tubular bar to push the outer tubular bar away from the retainer; and 
 a fastener fixedly coupled with the portion of the retainer adjacent the opening of the groove, wherein a stem portion of the fastener is disposed at the slot of the outer tubular bar and crosses the outer tubular bar such that when the first cut of the inner bar aligns with the slot of the outer tubular bar, the stem portion of the fastener seats at the first cut of the inner bar and the slot of the outer tubular bar, thereby restricting the inner bar and the outer tubular bar from moving with respect to each other.