machinery and equipment | Warren Forensics

Tag Archive: machinery and equipment

Case Study: Fatality Servicing Unsupported Excavator Boom
April 22, 2019 2:27 pm Leave a Comment
A mini-excavator at a job site developed a leak at a hydraulic fitting at the base of the cylinder that raises and lowers the boom. A subcontractor foreman at the site raised the boom to search for the leak. The foreman found and attempted to tighten the leaking fitting. When he did, the fitting separated from the base of the cylinder, releasing the hydraulic pressure that held the boom aloft. The boom fell and the bucket struck a nearby superintendent for the general contractor.

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Defective Vertical Baler Causes Serious Crush Injury to Operator’s Arm
January 29, 2019 5:08 pm Leave a Comment
I recently worked on an interesting case involving a box baler. An employee of a butcher shop put some empty cardboard boxes in a vertical box baler and pushed the control switch to compact the boxes. After the 30 by 60 inch platen weighing 851 pounds returned to its raised position, the employee reached into the open space above the bottom door on the baler and began to clear cardboard from the bale tie slots in the bottom of the raised platen. Suddenly, and without warning, the steel pin attaching the platen to the raised hydraulic cylinder rod failed. The heavy steel platen fell and crushed his arm which was outstretched over the baler door into the compaction space.

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Injury Involving a Capstan Winch
February 22, 2017 9:43 am Leave a Comment
A capstan winch uses a mechanically powered rotating cylinder, called a capstan, to apply pulling force through a rope. When the rope is looped around the rotating capstan and tightened, friction between the rope and capstan allows the winch to apply force to pull a load. A typical capstan winch is shown in Figure 1 below. (more…)
Forensic Examination of Losses that Include Programmable Logic Controllers (PLC’s)
May 7, 2015 2:17 am Leave a Comment
Many modern machines and processes are controlled by Programmable Logic Controllers (PLC’s). PLC’s are essentially computers that have the ability, properly connected and programmed, to interface with the outside world and control the actions of a machine like a robot or conveyor. The PLC has a processor for processing the user programmed logic, and also has input / output (I/O) wiring provisions for both analog (e.g. temperatures and pressure transducers) and digital (e.g. limit switches and indicator lights) devices. (more…)
Hand and Finger Injuries from a Defective Snow Blower
January 8, 2014 4:56 pm Leave a Comment
Nearly everyone who lives in a snowy climate would agree that a gas powered snow blower beats a person powered snow shovel for clearing the sidewalk or driveway. Shoveling heavy, wet snow causes injuries from back problems to heart attacks. No wonder that gas powered snow blowers of all sizes are a popular item this time of year. The larger ones may be ride-on types; smaller ones are typically walk-behind. In either case there is an auger to gather the snow as the device moves forward and a bladed fan (or “blower”) to discharge it out of a chute to one side or the other. (more…)
Protecting Industrial Employees from Workplace Hazards
June 11, 2013 8:12 am Leave a Comment
The recent Texas fertilizer plant explosion has focused the nation’s eyes on the important matter of workplace safety. When an employee is injured or killed on the job, Warren investigators are often called in to identify what went wrong and how it could have been prevented.
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Concrete Core Drill – Reducing Hazard Exposure by Design
May 13, 2013 8:03 am Leave a Comment
The safety hierarchy is a well-established principle among safety professionals. It’s a reliable and widely accepted method to minimize or eliminate exposure to hazards in products and workplaces.
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Fire Investigation Points to Design Failure.
March 20, 2013 12:37 pm Leave a Comment
Defects that cause problems in machines are categorized into two different concepts. Manufacturing defect is a term that applies to a situation where the defect was unintended. For example, a part was installed that did not meet the designer’s specifications or quality. A design defect is another matter. Design defect is a term that applies to a situation where the defect resulted from a purposeful decision or by failing to investigate or heed available design criteria on the part of a designer or builder. (more…)
Machine Safeguarding for an Imperfect Workforce: Humans.
March 14, 2013 2:18 am Leave a Comment
Every day more than 12 people in the United States lose their lives in workplace injuries, according to U.S. Department of Labor data. In 2011, OSHA estimates, 3.3 million people suffered a workplace injury from which they may never fully recover. Two of the top ten most frequently cited OSHA standards that result in injuries and death are lockout/tagout and machine guarding. (more…)

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