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"Deadman Controls on Lawn Mowers and Snowblowers" Triodyne Safety Brief v. 5 #2 (July 1988) Ralph L. Barnett and Dennis B. Brickman Consumer Product Safety Commission injury data are examined, and associated
failure modes and effects verify the predictions contained in the literature.
All failure modes involved ergonomic considerations. Zero mechanical state and
its relationship with the current approach to lawn mower and snowblower
maintenance are discussed.
"Changing World of Products Liability Law" Kenneth W. Clarkson and Francisco O. Loriga This paper highlights changes in products liability law in the fifty states
over the last decade.
"Automatic Garage Door Child Entrapment
Hazards" Michael A. Dilich and Gene D. Litwin The hazard of child entrapment injury sustained under a closing automatic
garage door is discussed and a brief history of standards development addressing
the hazard is presented. Although safety door reversal systems are provided to
protect against entrapment, they sometimes fail to perform properly, usually due
to improper installation or maintenance. Two new design concepts are presented
which offer improved protection from entrapment injury.
"Friction Sled" Claudine P. Giebs, Ralph L. Barnett, and Peter J. Poczynok Describes the Triodyne Friction Tester, a new device for measuring the slip
resistance of footwear against compliant surfaces, as opposed to other slip
resistance test devices which measure slip resistance on hard surfaces.
"Portable Luggage Cart Safety: An Application of
the Safety Hierarchy" Dennis B. Brickman Portable luggage carts accommodate large payloads using lightweight
structures. Most current designs adopt the bungee cord for rapidly securing and
unfastening the load. This element is the primary source of luggage cart
injuries because it produces impact hazards that strike the eye. Various
countermeasures appear throughout the family of luggage carts. Use of the Safety
Hierarchy imposes a discipline for the systematic evaluation and application of
safety strategies for mitigating the impact danger.
"Portable Luggage Cart Safety: An
Application of the Safety Hierarchy" Dennis B. Brickman A summarized version of the preceding paper.
"Extension Ladders: Going Out on a
Limb" Ralph L. Barnett and Andrew H. Tudor Sawing off a tree limb in front of you does not conjure up the slightest
portent of danger. However, this activity performed while standing on an
extension ladder can and has led to the telescoping collapse of the ladder.
"Fall Protection: Minimum Weight Lanyards
for Bowhunters" Ralph L. Barnett Bowhunters wear a safety belt for fall protection when climbing to or hunting
from a tree stand. This bulletin focuses on the minimum weight design of the
safety lanyard.
"Ladder Slide Out - First Order
Analysis" Ralph L. Barnett One of the more important collapse modes for straight, combination, and
extension ladders is base slide out; the top of the ladder slides down the
support wall as the base slips away from it. Various fundamental models have
been used to study this behavior. This paper revisits the analytical solutions
associated with these models and describes their implications for the analysis,
design, and testing of ladders.
"Bungee Cord Danger Analysis" Dennis B. Brickman, Ralph L. Barnett and Harry R. Smith The utility of bungee cords is so persistently attractive that they continue
to gain popularity. Unfortunately, one of the characteristics of bungee cords is
the sudden release of stored energy which results from opening of hooks, failure
of the bungee cord and hook connection, inadvertent release of the bungee cord
during application, and failure of the structure receiving the hook. The design
of personal protection equipment and the evaluation of the danger level related
to a released bungee cord require information on hook speed. This paper presents
a first order analysis of the maximum attainable speed.
"Infant Crib Failure Analysis," Dennis B. Brickman and Ralph L. Barnett The full text of this paper was published at the 51st Meeting of the
Society for Machinery Failure Prevention Technology and the 12th Biennial
Conference on Reliability, Stress Analysis and Failure Prevention in April
1997 and is available from Triodyne Inc. at no cost.
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