Leg supports

Leg Supporting body Forcing foot on ground while sitting in constrained posture... 

Leg supports may be braced or unbraced. Braced legs are those which are reinforced with either cross-bracing or swaybracing. Sway braces are the diagonal members which transfer the horizontal loads, but unlike cross braces, they operate in tension only. The diagonal members in a sway-braced system are called tie rods, which transfer the load to each adjacent panel. Turnbucldes may be used for adjustments of the tie rods. 

Whereas sldrt-supported vessels are more common in refinery service, leg-supported vessels are more common in the chemical industry. This may be due in part to the ventilation benefits and the toxicity of the stored or processed chemicals. Legs should not be used to support vessels in hi -vibration, shock, or cyclic service due to the high localized stresses at the attachments. 

Mat type, with three or more legs supported by a common mat. 

Load cell systems. By mounting load cells either on the lower side wall section or structural leg supports of a silo, direct measurement of material weight can be taken. This method is accurate and the only choice where certified weight requirements exist. 

The dimensions of the links are chosen so that the maximum width of the holder does not exceed the width of most standard operating tables, which is 60 mm. This frees the sides of the operating table and allows the accommodation of other equipment that is necessary for the procedure such as the patient s leg supports (Figure 24.6), which are needed for the prostate brachytherapy procedure. It also allows the use of a specially designed robot for the procedure [18-19] which extends from the side of the operating table. 

Probe holder design and dimensions allow the accommodation of other mechanisms necessary for prostate brachytherapy, such as leg supports and other robot arms that may extend from the sides. 

Within the limits set above the design can vary widely. The seat can be attached to the rest of the chair frame by leg supports at the four corners, or it can be cantilevered from the back with a floor pad support, or, in another version, from the front (Fig. 14-6). The seat construction can range from a formed sheet in two or three dimensions to one with rolled edges for reinforcement. It can have structural ribs molded in or it can be a sandwich panel construction made up of two molded parts cemented together. If can also be a structural foam molding, which is a sandwich panel construction. In each of the configurations there are tradeoffs of stiffness and strength which... 

Four columns or legs supporting the Citicorp Center s frame are positioned at the middle of each side of the building. LeMessurier designed a unique system of V-shaped wind braces on each facade, arranged in a chevron pattern, to transfer loads to the column. Construction of the Citicorp Center was completed in 1977. 

Leg-supported vessels are normally lightweight and the legs provide easy access to the bottom of the vessel. An economic design is shown in Fig. 12. b, where the legs attach directly to the vessel and the loads are transfened by shear action. 

Fabric overshoes with hard soles, and booties and fabric overshoes with leggings supported at the knee by elastic or drawstrings, provide further inexpensive options. 

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