Installation and operating instructions for
Rail Clamp DR 085/088 FHM
spring activated
– hydraulically released
E 09.797e
Issue: 14.09.2022
Version: 2
Drawn: BAHS
Checked: OHLM
Pages: 39
Page: 4
1
DESCRIPTION OF THE RAIL CLAMP
1.1 Operating principle
The rail clamp DR 085/088 FHM are hydraulic fail-safe calipers; the braking force is applied by
spring washers whereas hydraulic pressure is necessary to maintain the brake released. The
stack of spring washers is factory-adjusted. This adjustment, combined with adjustment of the
brake pads gap, determines the braking force value.
There is a type plate on the brake with a 16-digit article number. The exact design of the brake is
defined by this article number only.
Furhter to these instructions, please also consider the catalogue data for the brake at
www.ringspann.com and the drawings in the individual sections.
The rail clamps can be optionally delivered with an integrated hydraulic power unit type HCO2R
or type HTP3 (see Fig. 1.2).
The rail clamps are fitted with a manual release device that mechanically maintains the rail
clamp in released position without having to use the power source. This release is useful for
installation and maintenance operations when the power source is not available.
This manual release must be deactivated for the rail clamp to operate correctly.
The brakes have a manual release device mechanically holding the caliper open, without any
need for hydraulic pressure. This release is useful for installation and maintenance work when
there is no hydraulic pressure available.
These rail clamps are also fitted with a guide mechanism on the rail by steel rollers.
The guide rollers ensure the centering of the rail clamp on the rail, in spite of the possible
alignment faults of the latter.
Fig. 1.1
Fig. 1.2