DE2342839A1 - Childs carriage or play car - has linked self pivoting front wheels which automatically take up a forwards drive position - Google Patents

Abstract

The front wheels run on a double angled pivot bracket whereby the frame bearer is offset to the wheel centre point by about 75 mm. Both brackets are linked by a track rod. An arched slide area with a vertical slit is fixed to the track rod to act as a centraliser locking mechanism. A self locking angle lever actuated by a pull wire engages with the vertical slit. The advantage is that the push chair can be turned without tilting and scrubbing the wheels simply by pulling the wire which allows the front wheels to pivot freely. The wheels automatically take up a forwards drive position owing to their turning point being advanced in respect of the wheels bearing point.

Description

Josef Mayr jun. 8901 ReiihaytHhauser., Ha, No. 96 2342839

8/20/73

Strollers etc. with self-swiveling wheels

In the case of prams or pushchairs, it is common to arrange both pairs of wheels on rigid axles. To change the direction of travel, the front axle must be raised by pressing the handlebar. When the car is loaded, this requires a lot of effort and endangers balance and smoothness. On the other hand, it is known to equip trolleys with z \ re ± or four running wheels, which can be pivoted separately and, because of the eccentric position of the pivot point relative to the support point, adapt themselves to any direction of movement. However, if you equip a stroller with individually movable front wheels, the following serious disadvantages arise:

1) Straight travel can only be achieved if the carriage is permanently guided in the center of the bracket. Every slide outside of the Middle immediately leads to deflections.

2) Sloping lanes or small obstacles also cause deflections. Repositioning after using the escalator is disabled.

3) When the car is parked on a sloping track, the unbraked front part breaks out to the side.

4) When changing over to backward travel occurs during the swiveling the front wheels a completely uncontrolled movement behavior of the car.

The construction of a positive steering that can be handled from the guide bracket, on the other hand, would be too complex and inconvenient to handle.

The invention described below avoids these disadvantages and allows for all practically occurring operating conditions on roads, in supermarkets etc. easy and safe handling. Afterwards a stroller or Stroller equipped with two swiveling front wheels, the pivot point opposite the point of contact of the wheel in the direction of travel is arranged brought forward. The wheels therefore adjust themselves in the desired forward direction of travel. According to the invention the swiveling levers of the wheels are still connected to a tie rod, thereby breaking out the individual wheels, prevented. In addition, a locking device is installed, which can be operated from the handlebar while driving can be.

509811/0061

BATH ORIGINAL

This allows the tie rod or the front wheels to be fixed in their straight-ahead position. Straight forward and backwards, transport over stairs etc. as well as parking the car is normally done with the closed Lock and the carriage behaves like the usual design.

If, on the other hand, a deflection is to take place, the lock is opened and a slight sideshift on the guide handle is already carried out then brings the car effortlessly and without jarring in the desired direction. If you want to continue straight ahead, see this the lock can be reset and then locks automatically when the front wheels are in the straight-ahead position back on. The combination of self-steering wheels with tie rods and locking leads to such in carts Applications for a previously unknown driving and operating comfort.

A possible and tested embodiment for a steering system according to the invention is outlined in Figs. 1 and 2 and illustrates its principle.

The vehicle frame (1) is somewhat compared to a conventional car modified designed to give room for the swiveling of the front wheels. The front wheels (2) run on double angled ones Swivel brackets (3), with e.g. an offset between the bearing (4) of the bracket (3) and the wheel center point (5) in a Of the order of 75 mm has been found to be useful. Both brackets (3) are articulated to one another by a tie rod (6). This tie rod also allows a simple structural design of the wheel bearing, because the circular plane of the wheel (2) does not have to be precisely aligned with the pivot point (4) of the bracket. An off-center force attack on both Wheels works in the opposite direction and therefore balances each other out. The lock is appropriate somewhere depending on the frame construction Attached to the tie rod; but it would also be possible to lock one of the two swivel brackets (3). A The embodiment is shown in Fig. 1. On the tie rod (6) is a curved sliding surface (7) with a vertical one Slit attached, in which an angle lever (8) engages by itself, if it is released for this purpose. Its operation takes place via a linkage or more appropriately via a Bowden cable (9) from the guide bracket of the carriage. This type of construction is particular easy to use with collapsible trolleys and enables the same component to be used for different ones Car types.

Constructively expedient individual design of the storage and locking (series production, insensitivity to dirt, etc.), the operating _{handle on the guide bracket (button 4} rotary handle, etc.) and the carriage frame including aesthetic aspects is a matter of course for successful application of the invention.

509811/0061

BATH ORIGINAL

Claims (1)

S c hutzansρ ru ch: 1) Strollers or strollers, etc., characterized in that the front wheels (2) on swivel brackets (3) are pivotably mounted with pivot point (4) moved forward in the direction of travel, articulated to a tie rod (6) and can be locked in the straight ahead position by a locking device (7, 8, 9). 5098 11/0061
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