Collapsible playpen with safety device

Abstract: A safety device for collapsible playpen (20) is provided. The playpen includes four upper corner seats (21), four lower corner seats (22), four vertical posts (28) respectively their upper ends being secured to the upper corner seats (21) and their lower ends to the lower corner seats (22), four upper railings (24) which include a pair of identical parts pivoted together by an adapter having their outer ends respectively pivoted to the upper corner seat (21), a central seat (23) positioned at a lower center of the playpen, four drive rods (25) their inward ends diagonal pivoted to the central seat (23) and their outward ends to the lower corner seats (22) respectively, a pair of linking rods of two identical parts pivoted together by a connector parallel disposed and having their outer ends respectively being pivoted to the drive rods (25), a strip (27) connecting the linking rod and extending through a pair of hooks on the top of the central seat (23) and a casing attached to the peripheral portion of the playpen. This disclosure is characterized in four reinforcement rods (30) which are disposed under the drive rods (25) to prevent the top of the vertical posts (28) from falling inward so as to prevent the playpen from inadvertently collapsing.

Description: The present invention relates to nursery apparatus and more particularly to for a collapsible playpen including a safety device which can prevent the playpen from unintentionally being collapsed by a user. For easy movement collapsible playpens are therefore available in the market. My previous disclosure of a Control Device for Folding and Expanding a Base Portion of a Playpen is stated in U.S. Pat. Nr.5,497,517 as shown in Fig. 1, which includes four upper corners 11, four lower corners 12, a base portion 13, four upper railings 14, four drive posts 15 their ends respectively being pivoted to the lower corners 12 and a base portion 13, four vertical stands 18 respectively securing to the upper and lower corners 11 and 12, a pair of linking rods 16 pivoted to the four drive posts 15 a pair of resilient strips 17 respectively connecting to the base portion 13 and the linking rods 17 and a casing 19 covering the peripheral portion of the playpen with its bottom being placed on the base portion 13. When the base portion 13 is pulled upward and the upper railings 14 are pushed downward, the four vertical stands 18 will move centripetally thereby folding the playpen into a small rectangular form. However, if any of the upper railings 14 is inadvertently pushed downward (as shown in Fig. 2) by a user, the vertical stands 18 will move inward to eventually collapse the playpen. This dangerous situation is caused because the playpen lacks a safety device. The present invention has a main object to provide a collapsible playpen including a safety device which can prevent the vertical stands from falling inward in order to protect a child to be safe in the playpen. Another object of the present invention is to provide a collapsible playpen including a safety device which controls the four vertical stands parallel moving inward when the playpen is collapsed. Further object of the present invention is to provide a collapsible including a safety device playpen by which the playpen can be collapsed more rapidly and readily. Accordingly, the safety device of the present invention comprises four reinforcement posts added under the drive posts or under the upper railings or under both the drive posts and the railings of the conventional playpen of Fig. 1. So that the four additional reinforcement posts can provide appropriate tension to protect the upper portion of the vertical stands from falling inward in order to prevent the playpen from inadvertently collapsing. The present invention will become more fully understood by reference to the following detailed description when read in connection with the attached drawings. Figure 1 is a perspective view of a collapsible playpen of a prior art, Figure 2 is a side view of Fig. 1, Figure 3 is a perspective view showing a first preferred embodiment of the present invention, Figure 4 is an exploded perspective view showing a lower portion of the first preferred embodiment of Fig. 3, Figure 5 is a side view of Fig. 3 while the playpen is collapsed, Figure 6 is a vertical view indicating collapsed stands of the playpen according to the present invention, Figure 7 is a perspective view of second preferred embodiment of the present invention, and Figure 8 is a perspective view showing a third preferred embodiment of the present invention. With reference to Figs. 3 and 4 of the drawings, the collapsible playpen 20 of the present invention generally comprises four upper corner seats 21, four lower corner seats 22, four vertical posts 28 respectively secured to the upper and lower corner seats 21 and 22, four upper railings 24 peripherally and pivotally connected to the four upper corner seats 21 respectively so as to define a structure of rectangular configuration. The collapsible playpen further comprises a central seat 23 placed in the center of the playpen 20, four drive rods 25 disposed diagonally and respectively pivoted to the central seat 23 and the four lower corner seats 22, a pair of linking rods 26 parallel and respectively connected to a pivot 251 on each of the drive rods 25, a strip 27 connecting a connector 261 at a middle portion of each of the linking rods 26 and four reinforcement rods 30 disposed under the drive rods and diagonally pivoted between the central seat 23 and the lower corner seats 22 respectively and a casing attached to the peripheral potion and the bottom portion of the playpen above the top of the central seat. The upper corner seats 21 are of a generally shaped hollow interior body composed of two identical inverse U-shaped extensions perpendicular to each other and a first vertical recess in the conjunction point of the V-shaped body and directed downward to receive the upper ends of the vertical posts 28. Each of the inverse U-shaped extensions includes a pair of aligned through holes in the lateral walls thereof which pivotally engage with the outer ends of the upper railing 24 each of which is composed of two rods of equal length and pivotally connected at their inner ends by a fist adapter 241 so that the upper railings may be bent downward to become a roughly V-shaped configuration when the playpen is collapsed. Each of the lower corner seats 22 includes a second vertical recess directed upward to receive the lower ends of the vertical posts 28 and a flat U-shaped extension directed inward relative to the playpen 20. The flat U-shaped extension includes a pair of aligned through holes in the upper lateral walls to pivot with the outer ends of the drive rods 25 by an axial pin 252 and a pair of aligned through holes in the lower lateral walls to pivot with the outer ends of the reinforcement rods 30. The central seat 23 includes a roughly octagon upper portion, a rectangular lower portion, four first lugs symmetrically extending outward each having a pair of aligned through holes being pivoted to the inner ends of the drive rods 25, four second lugs symmetrically extending outward from the lower portion thereof and being pivoted to the inner ends of the reinforcement rods 30. The pivots 251 include a tubular body frictionally attached to each of the drive rods 25 at appropriate position and an askew extension of U-shaped section parallel to the linking rods 26 so as to respectively pivot with the outer ends of the linking rods 26 which are also pivotally combined with two rods of equal length by a connector 261. A strip 27 connects to the connectors respectively and extends through a pair of hooks on the top of the central seat 23 to define a pulling portion 271 between the hooks. Based on the above discussed embodiment the vertical posts 28 will not fall inward because of the addition of the reinforcement rods 30 which provide appropriate tensions to prevent the top of the vertical posts 28 from inward movement. So the playpen 20 will not be inadvertently collapsed even if the upper railing 24 is bent downward unintentionally. Referring to Figs. 5 and 6, the playpen 20 is folded by pulling up the pulling portion 271 of the strip 27 to drive the central seat 23 upward to break up the balance of lower portion of the playpen. So that all the linking rods 26, the drive rods 25 and the reinforcement rods 70 are bent upward to become inverse V-shapes (as shown in the broken lines of Fig. 5), then adapter 241 of the upper railings 24 is pushed downward to bend them to become V-shapes so that the playpen 20 is collapsed into a rectangular configuration (as shown in Fig.6). When the playpen is expanded the user only operates the above steps conversely and the playpen will be readily risen up. Referring to Fig. 7, a second embodiment of the playpen 20 of the present invention is provided in which the structure and function are mostly similar to the above embodiment described in Figs. 3-6 and the above discussions are applicable in the most instances. The only modification is that a second reinforcement rod 31 is disposed under each of the upper railings 24. Each of the second reinforcement rods 21 is also combined with two rods of equal length having their inner ends pivoted to the first connector 241 and their outer ends pivoted to the upper corner seat 21. It is known that the second reinforcement rods 31 can be bent downward together with the upper railings 24. However, it makes the playpen more durable. Referring to Fig. 8, a third embodiment of the playpen of the present invention is provided, which is generally a conventional playpen 50 of rectangular structure and includes four upper corner seats 51, four lower corner seat 52, four upper railings 54 perpendicularly pivoted to the four upper corner seat 51, four lower rods 55 including four reinforcement rods thereunder pivoted with the four lower corner seats 52 and four vertical posts 58 respectively secured into the upper and lower corner seats 51 and 52. According to this embodiment the upper railings 54 are combined with a pair of rods of equal length and their inner ends are pivoted to a first adapter 541. Both the lower rods 55 and the reinforcement rods 33 are also combined with two rods of equal length and pivoted to a second adapter 551 at their inner ends. When the playpen is folded the upper railings 54 are pushed downward and the lower rods 55 an the reinforcement rods 33 are simultaneously pushed upward so as to drive the four vertical posts 58 to move centripetally and the playpen 50 is therefore collapsed. For expanding the playpen 50 the operation is done conversely. This embodiment is characterized in simple structure and durability because of the addition of the reinforcement rods 33.

Claims: A collapsible playpen (20) including a safety device the collapsible playpen comprising: four upper corner seats (21) each including a V-shaped body of hollow interior having a pair of identical inverse U-shaped extensions perpendicular to each other, a first vertical recess in the conjunction point of the U-shaped extensions directed downward and said inverse U-shaped extensions each having a plurality of aligned through holes formed in upper and lower lateral walls thereof; four lower corner seats (22) each including a hollow flat body, a second vertical recess in one end of the body directed upward and a flat U-shaped extension extending outward from the second recess having a plurality of aligned through holes in the upper and lower walls of said U-shaped extensions; four vertical posts (28) each respectively being secured to the upper end to the first vertical recess of one of said upper corner seats (21) and at the lower end to the second vertical recess of one of said lower corner seats (22); four upper railings (24) each having a pair of outward ends pivoting to the aligned through holes in upper lateral side of the inverse U-shaped extension of one of said upper corner seats (21) to define a rectangular structure, said upper railings (24) each including a pair of identical rods pivoted at their inward ends to first connector; a central seat (23) positioned at a lower center of said playpen including a octagon upper portion, a rectangular lower portion, four first lugs symmetrically extending outward from the upper portion, four second lugs symmetrically extending outward from the lower portion and a pair of hook means spacedly formed on a top of the upper portion, said first and second lugs each having a pair of aligned through holes in their lateral walls; four drive rods (25) their inward ends being diagonally pivoted to the first lugs of said central seat (23) and their outward ends to upper portion of the U-shaped extension of said lower corner seats (22) respectively and each having a pivot sleeved on and in proximity of the outward end thereof, said pivots each including a tubular body, an askew extension of U-shaped section extending outward from a lateral side of the tubular body and a pair of aligned through holes in the lateral walls of the askew extension; a pair of linking rods each of which is combined with a pair of identical parts and is pivoted at their inner ends to a second connector parallel pivoting their outward ends to the askew extensions of a pair of said pivots respectively, a strip (27) having two ends respectively connected to the second connectors of said linking rods (26) and extending through the hook means of said central seat (23) to define a pulling portion (271) therebetween; a casing attached to the peripheral portion of said playpen including a bottom positioned above said central seat (23);. extensions of said lower corner seats (22) respectively; whereby said playpen is collapsed when the pulling portion (271) of said strip (27) is pulled up and the upper railings (24) are pushed down simultaneously characterized in that the playpen further comprises four first reinforcement rods (30) disposed under said drive rods (25) and having their inward ends pivoting to the second lugs of said central seat (23) and the lower walls of the U-shaped. The playpen as recited in claim 1 further including four second reinforcement rods (30) disposed under said upper railings (24), said second reinforcement rods (30) each including a pair of identical parts having their inward ends pivoted to a lower portion of said first connector and their outward ends to a lower wall of the inverse U-shaped extension of said upper corner seats (21) respectively. A collapsible playpen (50) including a safety device, the collapsible playpen (50) comprising: four upper corner seats (51); four lower corner seats (52); four vertical posts (58) having their upper ends secured to said upper corner seats (51) and their lower ends secured to said lower corner seats (52) respectively; four upper railings (54) having their outward ends pivoted to an upper portion of said upper corner seats (51) respectively, said upper railings (54) each including a pair of identical parts having their inward ends pivoted to a first connectors respectively; a casing attached to peripheral portion of said playpen including a bottom positioned under said first reinforcement rods (33); whereby said playpen is collapsible when said upper railings (54) are pushed downward and said lower railings together with said first reinforcement rods (33) are pushed upward simultaneously characterized by four lower railings (55) having their outward ends pivoted to an upper portion of said lower corner seats (52) respectively said lower railings each including a pair of identical parts pivoted at their inward ends to an upper portion of a second connector; four first reinforcement rods (33) disposed under said lower railings (55) respectively, said first reinforcement rods (33) each including a pair of identical parts having their inward ends pivoted to a lower portion of said second connector (551) and their outward ends to a lower portion of said lower corner seat (52) respectively. The playpen according to claim 3 further including four second reinforcement rods (33) disposed under said upper railings (54), said second reinforcement rods (33) each including a pair of identical parts having their inward ends pivoted to a lower portion of said first connector and their outward ends to a lower portion of said upper corner seat respectively.

Inventors: WANG KUN, WANG, KUN
Applicants: WANG KUN, WANG, KUN
Application year: 1999
Main classification: A47D13
IPC codes: A47D13