Loose Screws in TV Mounts
Hazard [Health Devices Nov 1992;21(11):427]
A member hospital reported an incident in which
a television set fell from its mounting bracket when a nurse attempted to swivel
it. The TV struck the nurse on the shoulders and back, fell to the floor, and
then shattered. It was subsequently discovered that the locking screw in the
swivel that holds the TV tray to the wall bracket of the mount (see figure) had backed out.
The locking screw is the only
screw in the assembly that is in a circular hole; the other three screws are in
keyhole-shaped holes (this is apparent only when the TV is dismounted). After the locking
screw backed out, the three remaining screws in the assembly were then able to slip out of
the keyhole slots in the swivel, allowing the TV to fall.
The particular device involved in this incident is no longer manufactured,
but its design is similar to that of newer models. However, this is the only reported
failure of this type of mount assembly. Proper tightening of the screws will prevent such
a failure, and a thread locker can also be used during installation.
Although the incidence of this problem is apparently low, the outcome
could be severe. Hospitals typically have numerous TV mounts of various brands that are
used by hospital staff, patients, and visitors. While not all mounts will be of the type
or brand involved in this incident, the designs may be similar. TV mounts are rarely
inspected, and problems with them are infrequently reported; however, other situations
besides the one in this incident could be uncovered and corrected during an inspection.
ECRI believes that, considering the risks, such preventive action should be taken.
Inspect all TV mounts for security. Inspect the mounts to
determine whether the screws holding the TV tray to the wall bracket are tight. Check that
swivel bases are firmly attached to the wall mount bracket. Consider applying a penetrating
thread locker (e.g., Loctite®
Low Viscosity Threadlocker 290) to the
protruding threads of the screws holding a swivel base to the wall
mount; the thread locker will be pulled into the threads and prevent the screw
from backing out during use.
- Contact ECRI concerning similar problems with TV
Mounts, Television Set, Hospital [15-986]
Cause of Device-Related Incident
Device factors: Design/labeling error;
Improper maintenance, testing, repair, or lack or failure of incoming
Mechanism of Injury or Death