Saturday, August 19, 2017

Simple Design Innovations

Shopping cart is one design that has not evolved since its introduction in 1937.  The major development came in 1946 with the nesting carts.  After that, the only advances have been in minor tweaks like steerable rear wheels, adjustable height/volume, etc.

Of late, with the advent of digital technology, the cart is getting a fresh look.  IDEO is a design firm that looked at reinventing the shopping cart and came up with this design:


Several other companies are incorporating a digital display into the shopping cart to enhance the user experience.  Some of these displays show the store planogram whereas some display coupons or both.


These are slow evolutions of the shopping cart and taking it over the digital hump.  For all we know, the innovations will halt abruptly because online shopping and home deliveries are taking over all over the world.

Here is a minor design change I noticed.  I was at a shopping mall in Copenhagen recently and saw that it had sloped flat escalators taking visitors from the underground parking garages into the mall upstairs.  They were pretty steep.  I noticed several shoppers taking their shopping cart (the usual big ones) filled with goods down the escalator.  The carts were standing on the inclined escalator without slipping.  My first thought was that there must be a brake that the user applies to hold it in place.  Then, it would be a bad and dangerous design: what if the user forgot to apply the brakes?  what is the brakes failed?  What if the user accidentally released the brakes?  All of this would lead to serious repercussions.  Imagine a fully loaded shopping cart racing towards you on an inclined escalator.  You wouldn't be a happy customer.


Upon closer scrutiny, I noticed the clever design that held the carts in place and stopped them from rolling.  The design of the shopping cart used the escalator design to its advantage.  It was a very simple design change to the wheels that accomplished the task automatically and without failure.



Below is a drawing depicting the wheel design.  Instead of a flat wheel, these wheels had a straight groove tread.  Beside the wheels were pads that were affixed to the shopping cart frame.  Whenever the cart was rolled on a flat floor, the wheels would be in contact of the floor and hence they would roll.  But, whenever the cart was rolled onto an escalator, the wheel treads would fall into the escalator grooves and the pads would grab hold of the 'floor' (escalator floor) thereby arresting the cart since the pads were flat and non-rotating.  Clever way to solve the problem.


The beauty of the design was the simplicity.  This design requires no moving parts and it is fail safe and idiot proof..  Based on the design, irrespective of how you place the cart on the escalator, at least three of the wheels would lock.  Note that the carts were wide enough that you could not turn them sideways on the narrow escalators.

Reminds me that great designs are always simple designs.