Land vehicles – Wheeled – Extensible
Patent
1984-05-30
1987-05-12
Mitchell, David M.
Land vehicles
Wheeled
Extensible
280 37, 280647, 280 4738, B62B 710
Patent
active
046643974
DESCRIPTION:
BRIEF SUMMARY
The present invention is concerned with a perambulator.
In prior art perambulators, the carriage body is supported by lateral supports attached to arms that can be folded up and down like scissors, the rear pair of arms being extended so as to form the pushing bow of the perambulator. Thereby, the body can be lowered so as to rest directly on the undercarriage, whereas the frame remains as of substantially unchanged size, despite the fact that the wheels of the perambulator can usually be detached from the wheel axles passing through the undercarriage. A push carriage of so-called normalsize and designed mainly for sitting is folded together in the same way. Moreover, there are carriages of very light construction that are folded together side-ways, the said light constructions being, however, not suitable for perambulators.
The object of the present invention is to provide a novel perambulator of simple construction and operation and which can be folded together to a considerably smaller size than prior-art perambulators.
The perambulator in accordance with the invention is mainly characterized in that the wheels of the peraxbulator are, in pairs at each side of the perambulator, mounted to the undercarriage by means of a pivoting element pivotable around one longitudinal axle, attached to the undercarriage, between an outer driving position and an inner resting position inside the undercarriage, over an angle of about 270.degree..
In a preferred embodiment, the pivoting element comprises a pivoting profile provided with a part that, in the driving position of the pivoting element, projects from the undercarriage, means of suspension of the respective pairs of wheels being fixed to the said projecting part, and with a part extending from the said projecting part towards the undercarriage, the pivoting element being arranged to be locked in the driving position by co-operation with supporting arms of the carriage body.
Thus, in the perambulator in accordance with the invention, the wheels can be swung in completely in the lateral direction, e.g. into a basket for merchandise placed on the frame structure of the undercarriage, the said basket being preferably narrow enough so that it can be, in its turn, placed into the carriage body, whereby a decisive economy of space is achieved as compared with prior-art perambulators. In the inner position, the wheels are placed in pairs one pair above the other, in the outer position the pivoting element is locked at each side of the undercarriage automatically when the supporting arms of the carriage body are turned up to the supporting position.
The part of the pivoting profile of the pivoting element projecting from the undercarriage and the suspension means of the respective pairs of wheels are advantageously dimensioned in such a way in relation to each other in the lateral direction that the wheel suspension means alternatively can be fixed to the inside of the pivoting profile, whereat the width of the wheels can be varied; a narrower width can be used if a carriage seat is mounted on the undercarriage.
The wheel suspension means attached to the pivoting profile is preferably provided with a hood with pivot shafts for the forks of the front and rear wheels and with mutually compensating springs for the latter, e.g., in the form of a leaf spring attached to one fork above its pivot shaft and to the other fork below its pivot shaft.
Such a compensating suspension remarkably reduces the tendency of the perambulator to tip forwards or rearwards in the case of uneven loading at either end, and, at the same time, it is capable of noticeably attenuating the inclination of the perambulator forwards and rearwards when moving over recesses or elevations, such as pavement edges.
In order to avoid unnecessary weight and consumption of material, the extension of the pivoting element in the longitudinal direction of the carriage is relatively little, whereby the supporting arms are mounted near the middle of the undercarriage. The upper parts of the supporting arms are there
REFERENCES:
patent: 1113280 (1914-10-01), Ambler
patent: 2873820 (1959-02-01), Rizzuto
patent: 3442527 (1969-05-01), Gottfried
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