Structure of a foldable baby bed base

A base of a foldable baby bed base comprises a middle member, two pivotal rods, two turning members and four connecting rods; middle parts of the pivotal rods are pivoted to the middle member; inner ends of the pivotal rods are pivoted to each other, and are biased downwardly by springs; a belt is connected to the inner ends of the pivotal rods such that pivotal rods can be pivoted on the middle member by pulling the belt; the turning members are connected to two outer ends of the middle member with rod parts thereof turnably received in outer end holes of the middle member; the rod parts each has stopping elements opposing each other; the upper ones of the stopping elements are located adjacent to end walls of the middle member for the rod parts to be stopped from turning inwardly; the lower ones of the stopping elements are located in curved recesses at outer ends of the pivotal rods to prevent the rod parts from turning outwardly unless the pivotal rods are pivoted for the curved recesses thereof to be separated from the lower stopping elements; the connecting rods are pivoted to the turning members for the bed to be foldable.

BACKGROUND OF THE INVENTION
 The present invention relates to a base of a foldable baby bed, which an be
 folded to a smaller size when not in use.
 A heretofore known foldable bed base, referring to FIGS. 9 and 10,
 comprises a connecting rod combination 9, supporting members 10 and
 movable members 20 as the main parts.
 The connecting rod combination 9 consists of straight rods 91 and bent rods
 92. The straight rods 91 are respectively pivoted to the bent rods 92. The
 rods 91 and 92 each has an elongated hole 911, 921 at inner ends thereof.
 Stationary supports 94 are connected to the rods 91 and 92 for supporting
 them at the position where the rods 91 and 92 are pivoted to each other.
 The stationary supports 94 each has a curved recess 941 for the
 corresponding bent rod 92 to be located thereon, and a through hole 942
 for receiving a bolt used to pivot the rods 91 to the coresponding rod 92.
 Each of the stationary supports 94 further has a supporting leg 943.
 Each of inner ends of the rods 91 and 92 is connected with a connecting
 member 93; the connecting members 93 each has a tube part 931 having a
 through hole 932, and a connecting tube 933 having a sloped locating
 surface 934 and a through hole 935.
 The supporting members 10 each has two opposing gaps 101, a hole 102, a
 supporting leg 105 and a locating trench 106. The supporting legs 105 are
 arranged under the transverse rods 104; holes 107 are provided on the
 transverse rods 104 into order for a bolt 108 to pass therethrough to
 pivot one of transverse rods to the other.
 The movable members 20 each has a C-shaped gap 201 at one end, and a
 platform portion 202 at the opposing end; the platform portions 202 each
 has a supporting leg 203 thereunder.
 In combination, the connecting plate parts 933 of the connecting members 93
 are passed into and, by means of a bolt, pivoted to a respective one of
 the gaps 101 of the supporting members 10. The inner ends of the rods 91,
 92 are each passed into a respective one of the connecting members 93. A
 bolt for a pivotal connection pivots the through hole 932 and the
 elongated hole 921.
 A bolt 108 is passed through the through holes 107 of the transverse rods
 104 for pivotally connecting the transverse rods 104; washers 109, 100 are
 used on the holes 107 before the bolt 108 is passed into the holes 107.
 Furthermore, the movable members 20 are pivoted to the supporting members
 10 by connecting the C-shaped gaps 201 to a respective one of the annular
 recesses 103 of the supporting members 10.
 However, it can be seen that the base of the foldable bed has too many
 components, making the structure very complicated, and the assembling
 relatively labor-costing.
 SUMMARY
 Therefore, it is a main object of the present invention to provide a base
 of a foldable baby bed which has relatively few components and can be
 assembled very easily in order for the manufacturing cost to become lower
 than the prior art one.
 The base of a foldable baby bed of the present invention comprises:
 a connecting rod combination consisting of four connecting rods;
 a middle member having a supporting pole, two hollows at two sides of the
 supporting pole, second connecting protrusions at two ends of the middle
 member, and first connecting protrusions between the hollows and the
 second connecting protrusions; springs being received in the hollow;
 a first pivotal rod having a curved recess at an outer end thereof; the
 first pivotal rod being pivoted to one of the first connecting protrusions
 from a middle part thereof; the first pivotal rod further having a
 locating block at an inner end, passed into the corresponding one of
 springs in the hollows;
 a second pivotal rod having a curved recess at an outer end thereof; the
 second pivotal rod being pivoted to the other first connecting protrusions
 from a middle part, and being biased downwards by the other spring of the
 hollow at an inner end; the inner end of the first pivotal rod being
 pivoted to the inner end of the second pivotal rod, and connected with a
 belt such that the inner end of the rods can be lifted to pivot the rods
 by pulling the belt;
 two turning members each having a rod part pivot a respective one of the
 second connecting protrusions; the connecting rods being pivoted to the
 turning members; the rod parts each having two stopping elements opposing
 each other; the upper ones of the stopping elements are located adjacent
 to a wall of the middle member between the second connecting protrusions
 to stop the rod parts from turning inwardly; the lower ones of the
 stopping elements being each located in a respective one of curved
 recesses on the outer ends of the first and the second rods when the belt
 is not pulled, stopping the rod parts of the turning members from turning
 when the foldable bed is stretched to an in-use position.
 It can be seen that the base of a foldable bed of the present invention has
 relatively few components, and can be assembled with less labor than the
 prior art one.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
 A base of a foldable baby bed of the present invention, referring to FIGS.
 1,2 and 8, comprises a connecting combination 1, a middle member 2, a
 first pivotal rod 3, a second pivotal rod 4 and two turning members 5 as
 the main parts.
 The connecting rod combination 1 includes four connecting rods 11 and two
 supporting rods 12 each connected to a connecting rod 11 in an opposite
 position. The supporting rods 12 are provided for supporting the bed base
 from the ground.
 The middle part 2 has a supporting pole 21, two hollows 22 at two sides of
 the supporting pole 21, first connecting protrusions 24, and second
 connecting protrusions 25 at outer ends thereof. The hollows 22 each has a
 spring 23 received therein. The supporting pole 21 is provided for
 supporting the bed base from the ground. Each of the first and the second
 connecting protrusions 24 and 25 has a through hole 241, 251. The middle
 part 2 further has an elongated hole 27. Gaps 26 are formed between the
 adjacent ones of the connecting protrusions 25 of the middle part. Each of
 the gaps 26 has a wall (not numbered).
 Referring specifically to FIG. 1, the first pivotal rod 3 has a curved
 recess 31 at outer end thereof, and has two connecting protrusions 32
 opposing each other at a middle portion thereof. Each of the connecting
 protrusions 32 has a through hole 321. The first pivotal rod 3 further has
 a locating block 33 and a plate part 34 having an elongated hole 341. A
 pivotal hole 342 is provided above the elongated hole 341 on the plate
 part 34.
 The second pivotal rod 4 has a curved recess 41 at an outer end thereof,
 and has two connecting protrusions 42 opposing each other. Each of the
 connecting protrusions 42 has a through hole 421. The second pivotal rod
 further has a locating block 43, and a plate part 44 having a pivotal hole
 441.
 Referring specifically to FIG. 2, the turning members 5 each includes a rod
 part 51, two connecting parts 53, a stopping block 54 and a stopping
 element 56. Fixing elements 52 are used to connect two ends of the rod
 part 51 to the connecting parts 53. The stopping blocks 54 and the
 stopping elements 56 are fixed on two sides of the rod part 51 by means of
 fixing elements 55 past through a hole 541 of the stopping block 54, a
 through hole 511 of the rod part 51 and the stopping element 56.
 In combination, the springs 23 are positioned in the hollows 22 of the
 middle part 2. The first pivotal rod 3 is pivoted to the middle part 2 by
 inserting a pivotal revet 6 into the through holes 321 of the first
 pivotal rod 3 and the through holes 241 of the first connecting
 protrusions 24 of the middle part 2 with the locating block 33 inserted
 into a lower end portion of the corresponding spring 23 of the middle part
 2. The second pivotal rod 4 is pivoted to the middle part 2 by inserting
 another pivotal rivet 6 into the through holes 421 and 241 with the
 locating block 43 inserted into a lower end portion of the corresponding
 spring 23 in the middle part 2. Next, a pivotal rivet 8 is inserted into
 the pivotal holes 441 of the first and the second pivotal rods to pivot
 the second pivotal rod 4 to the first one 3. A belt 7 is passed through
 the elongated holes 27 and 341, and connected to the first pivotal rod 3
 such that a user can pull the belt 7 to control the position of the first
 pivotal rod 3. Then, the rod parts 51 of the turning members 5 are
 inserted into the through holes 251 of the connecting protrusions 25 of
 the middle member 2 with the stopping blocks 54, and the stopping elements
 56 located adjacent to the walls of the gaps 26 of the middle member 2,
 and the curved recesses 31,41 of the pivotal rods 3, 4 respectively. Then,
 the connecting parts 53 are connected to two ends of the rod parts 51 by
 means of the fixing elements 52. And, the connecting rods 11 of the
 connecting rod combination 1 are each pivoted to a corresponding one of
 the connecting parts 53.
 When the foldable baby bed is stretched to an in-use position, the stopping
 blocks 54 and the stopping elements 56 contact the walls of the gaps 26,
 and the curved recesses 31, 41 of the pivotal rods 3, 4 respectively,
 prevent the rod parts 51 of the turning members 5 from turning, firmly
 locating the related parts in an unfolded in-use position.
 To fold the bed from an in-use position to a folded not-in-use position,
 referring to FIGS. 6 and 7, the belt 7 is pulled upwards to pivot the
 pivotal rods 3 and 4 on the middle member 2, moving the curved recesses
 31, 41 of the pivotal rods away from the stopping elements 56 of the
 turning members 5. Thus, the rod members 51 of the turning members 5 are
 no longer stopped from turning. Therefore, a user can turn the turning
 members 5, and pivot the connecting rods 11 on the turning members 5 to
 fold the baby bed. From the above description, it can be seen that the
 base of the foldable baby bed has advantages as follows.
 1. The foldable bed can be folded and unfolded very easily.
 2. The foldable bed base has fewer components than the prior art one.
 Therefore, the manufacturing cost is lower, and the assembling labor is
 less.
 3. The stopping element and the stopping block of the turning member are
 stopped from moving by the curved recess, and the wall of the gap of the
 middle member, preventing the bed, after unfolded, from being unwarily
 folded.