Loher Str. 4
58332 Schwelm
Germany
fon: +49 2336 92 98-0
fax: +49 2336 92 98-100
info@henning-gmbh.de
www.henning-gmbh.de
www.henning-cnc.de
Operating Instructions Elevator Buffers LP Page 2 Edition 3.3.1 EN of 03.04.2017
In the case of a buffer stroke the piston rod 2 is
forced into the cylinder tube 1 and the hydraulic
fluid 3 in the tube is displaced and forced to the
outside through small throttling ports 4 in the
tube wall. The fluid accumulates within the jack-
et tube 5.
At the same time the gas volume 6 above the
hydraulic medium is further compressed. The
sealing system 7 maintains a reliable seal be-
tween the hard chromium-plated piston rod and
the atmosphere.
After the buffer stroke and return to hydraulic
balance the compressed gas volume forces the
displaced fluid back into the cylinder and ex-
tends the piston rod.
The level of the hydraulic fluid at the gas inter-
face can be read at any time through the sight
glass 9 without opening the unit.
An elastic impact plate 16 damps the impact and
reduces the noise.
The limit switch 13 monitors the extended ready
position of the buffer. The limit switch is actuated
by pressure on the piston rod by the linear slide
17 or the protection tube 10 respectively.
In the case of buffers equipped with a protection
tube 10, for maintenance work the screws 12 on
the buffer head 11 are removed. Subsequently,
the protection tube can be lowered, which simul-
taneously actuates the switch 13. The oil filler
screw 14 and the gas-filling valve 15 will then be
accessible.
In the normal operating state the protection tube
avoids damage and contamination of the piston
rod.
3 General Instructions
If people are working in the elevator shaft a
suitable refuge must be ensured.
For this purpose the general safety instructions
of the elevator manufacturer have to be ob-
served.
Warning!
Buffers are safety devices. Mounting, inspection and maintenance work
may only be carried out by expert personnel! Observe the
applicable safety instructions!
4 Preparations
4.1 Design Data
Among the data on the buffer type plate there is
included:
• Piston diameter and stroke
• Minimum impact mass,
• Maximum impact mass and
• Rated speed
4.2 Ambient Temperature Limit
The ambient temperature should be between
-10 °C and 50 °C.
The buffer can be supplied in a special design
filled with a special hydraulic oil for low ambient
The first check should be to ensure that the op-
erating conditions do not exceed this design
data.
temperatures. This buffer can be used between
-20 °C and +40 °C and is labelled with a special
designation for this temperature range. An en-
hanced EC type examination is also provided.
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