Swinging door

Swinging doors are often considered practical, since a person can walk through with both hands full. Many types, though, will swing back with a vengeance, causing problems for the next person entering. 

Fig. 8.8 Swinging-door model for mechanism of alanine racemase reaction. (Reproduced with permission from Henderson and Johnston, Biochem. Biophys. Res. Commun., 68, 797 (1976)).

Henderson and Johnston [59] based on their work with alanine racemase from B. subtilis proposed catalysis by a single base with motion of the coenzyme-substrate complex in a process they termed a swinging door mechanism (Scheme IX). Their proposed mechanism is based on the observation of pronounced asymmetry in the interaction of many racemases with their enantiomeric substrates [55], for example, in the inactivation of the enzyme by D- and L-/I-chloroalanine [59]. The position of the door relative to the point of protonation/deprotonation would determine whether a D- or an L-amino acid is interacting with the enzyme, and if one position were more stable than the other, the enzyme would interact differently with a D- and an L-isomer. 

Scheme IX. Swinging door mechanism for PLP-dependent enzymatic amino acid racemization (from [57]).

Cast gear case and swing door for quiet operation... 

E.H. Bristol, Swinging Door Trending Adaptive Trend Recording ISA Conference Proceedings. 749, (1990). 

Bifold door- Doors that are hinged in the middle for opening in a smaller area than standard swing doors. Often used for closet doors. 

Figure 4.17. Swing door assembly. [Adapted Figure 4.18. Details of the seal. [Adapted from from Kellogg, C. F. Dietrich, A. T, US Patent Kellogg, C. R Dietrich, A. T., US Patent...

Everyone that got there was thrown out and followed until he became a rolling ball that thumped and thumped down the stairs, [and when they reached the bottom] a big man caught them and threw them out without bothering to open the swinging doors first. They crashed through with enough momentum to cany them out in the middle of the street. 

A wall oven is the recommended type of oven to be used when accommodating persons with disabilities. This type of oven can be installed at the most appropriate height for the user, and the controls can be placed within reach of a standing or sitting user. Wall ovens come in several widths (24, 27, and 30 in). There are three types of doors that can be used drop-front, side-hinged, and swinging doors. 

Space must be available on the pull side of the door to operate the door latch, pull the door open, and remain out of the way of the swinging door. 

An outward-swinging door is preferable to provide more accessibility. 

Carefully move equipment carts through corridors to avoid collision and tripping hazards. Reduce speed near stairways, corridor intersections, elevators, and down ramps. Workers should puU a cart through swinging doors, rather than pushing it. Never leave carts, equipment, or supplies in a location that creates a hazard or provides access to cart contents. Personnel must immediately report any cart needing repair or wheel replacement. Workers must never push one cart while pulling another (Table 10.2). 

Cabinet. An enclosure designed either for surface or flush mounting, and provided with a frame, mat, or trim in which a swinging door or doors are or may be hung. 

Cutout box. An enclosure designed for surface mounting and having swinging doors or covers secured directly to and telescoping with the walls of the box proper. (See Cabinet. )... 

If the hood is located near a doorway, the door must not be used while the hood is in use. The pumping action of a swinging door can draw vapors out of the faee of the hood chamber, especially if the fume hood face velocity is less than 0.5 meters per second (100 Ifpm). 

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