A Patio Umbrella Primer
April showers may soon be upon us, but it’s not too early to start thinking about the sunny days ahead. Patio umbrellas are a great addition to patio furniture sets; they look nice, provide shade and are good for your health and overall well being. Find out why the best times are made in the shade. Here are some quick specs on the types of umbrella out on the market today.
In general, most umbrellas have a diameter of six to 11 feet wide when open. The smaller models are better suited to tabletops, while the larger ones can more easily cover wider areas. The standard height for umbrella poles is somewhere between seven and nine feet high, high enough to be out of head range, but also within arm’s reach for ease of opening, closing and cleaning purposes.
Poles are usually made from a weatherproof wood or lightweight aluminum, while the umbrella tops can be made from vinyl, nylon or a poly blend. These materials are not only waterproof, but they are also easy to clean and resistant to ripping from the wind, fading in the sun, and even mold and stains. It also allows for umbrellas to come in an endless array of colors, prints and patterns.
There are three main lifting mechanisms used to open umbrellas. The first is a manual open, much like what you would see on a portable umbrella. To open this type of umbrella, the user pushes the gathered spokes at the base in an upward motion, whereupon they spread out as they open and lock into place around a central point.
The pulley style is very commonly seen at pools, beaches and in use with other commercial umbrellas. The simple physics of this lift uses a rope that’s pulled to open the umbrella spokes. To keep in place, a peg is fitted into a notch on the pole, or else the rope is simply tied into place.
The most recent type of lift mechanism is the crank. The easiest and least resistant method, opening the umbrella requires the user to simply turn a crank in one direction, and the opposite direction to close. While the first two mechanisms are typical of traditional wooden umbrellas, the crank is exclusive to metal (typically aluminum) umbrella poles.
Once open, many umbrellas also feature a convenient auto tilt mechanism that allows the umbrella to be tilted at an angle, thereby providing controlled shade at more than just a straight downward position. There are three types of tilt action. In one method, the umbrella can continue to be cranked past an open position to achieve a greater angle. Another method utilizes a collar that fits over the crank and can be manually repositioned. A final method uses a simple push-button.
In the next installment, we’ll discuss the types of umbrella bases and variety of accessories to spiff up your umbrella, as well as why umbrellas are more than just something nice to look at.




