초록 ▼

A foldable dolly in which the arms are rotatably mounted to the frame preferably by means of interengaging sleeves formed with opposed ramps and opposed shoulders and positioned in relatively vertical alignment such that the ramps and shoulders of the first sleeve mate with the ramps and shoulders o

A foldable dolly in which the arms are rotatably mounted to the frame preferably by means of interengaging sleeves formed with opposed ramps and opposed shoulders and positioned in relatively vertical alignment such that the ramps and shoulders of the first sleeve mate with the ramps and shoulders of the second sleeve. The sleeves are thereby found to permit rotation of the arms between a folded, collapsed position and an extended deployed position, while at the same time providing enhanced rigidity and stability of the arms at the extended, deployed position.

대표청구항 ▼

1. A foldable dolly including frame means, arm means, and mounting means movably mounting said arm means to said frame means for rotation of said arm means with respect to said frame means between an outwardly extending deployed position and a collapsed stored position, said mounting means including

1. A foldable dolly including frame means, arm means, and mounting means movably mounting said arm means to said frame means for rotation of said arm means with respect to said frame means between an outwardly extending deployed position and a collapsed stored position, said mounting means including interengaging shoulders providing stop means formed to limit rotation of said arm means at said deployed position, and said mounting means further including a first ramp carried by said frame means and a second ramp formed for mating sliding engagement with said first ramp and carried by said arm, said first ramp and said second ramp being formed and positioned to urge said shoulders into interengagement in said deployed position and formed to permit rotational movement of said arm means from said deployed position to said collapsed position, wherein the improvement comprises: said stop means is provided by a first substantially vertically oriented shoulder carried by said frame means in opposed relation to said first ramp, and a second substantially vertically oriented shoulder carried by said arm means in opposed relation to said second ramp. 2. The foldable dolly as defined in claim 1 wherein, said first ramp and said first shoulder are formed in a first sleeve mounted to said frame means, and said second ramp and said second shoulder are formed in a second sleeve mounted to said arm means. 3. The foldable dolly as defined in claim 2 wherein, said first sleeve is formed with a pair of spaced apart first ramps and a pair of spaced apart opposed first shoulders, said second sleeve is formed with a pair of spaced apart second ramps and a pair of spaced apart opposed second shoulders positioned to mate respectively with said ramps and shoulders on said first sleeve. 4. The foldable dolly as defined in claim 3 wherein, said first sleeve is formed with auxiliary stop means mounted and positioned to limit rotation of said arm means at said deployed position. 5. A foldable dolly including: frame means and arm means movably mounted to said frame means by a first sleeve mounted to said frame means and a second sleeve mounted to said arm means, said first sleeve being formed with a pair of spaced apart first ramps and oppositely positioned pair of spaced apart first shoulders, said second sleeve being formed with a pair of spaced apart second ramps and oppositely positioned pair of spaced apart second shoulders, and said second sleeve being positioned in relatively vertical alignment to mate with said ramps and said shoulders in said first sleeve the arm means folded together in an overlapping collapsed position, said first shoulder and said second shoulder being formed for interengagement upon rotation of said arm means to said deployed position auxiliary stop means mounted and positioned on said first sleeve to additionally limit rotation of said arm means at said deployed position.