Accionadores lineales RH 1250

Principal use
• Height adjustment of hospital and nursing beds as well as mobile nursing chairs
• Height adjustment of patient transporters and therapy couches
• Adjustment of examination and care chairs as well as childbirth beds
• Height adjustment of instrument tables
• Actuator for lifting modules and lifting tables

Description
Linear actuators RH 1250 are manually operated, hermetically sealed, hydro-mechanical actuators for linear adjusting procedures.
The compact design contains the pump piston and the valve technology. Also the oil reservoir and the plunger cylinder are integrated. The hydraulic transmission in connection with the manual operation allows a good dosage of very high forces. Important for that are also the mechanics with minimum clearance as well as the sensitive responding valves with exactly defined switching points.
In principle only push forces can be generated.

The plunger rod is extended by reversible rotation of approx. 40° by an operating lever at the operating shaft. The recommended lever length is approx. 300 mm.
To retract the plunger cylinder, the operating shaft has to be turned to the opposite direction by approx. 10°. The operating shaft returns automatically.

Functioning
All versions of the RH 1250 are operated with an operating lever, that is pinned at the operating shaft. The integrated flow control valve provides for an uniform descent speed in all load conditions.
Due to the possibility to get a drilled operating shaft, the actuator can quickly be installed and put into operation.
It has to be considered that the user's construction always acts with push force onto the actuator.
The actuator has a high safety against overload. In the case of overload it is not possible to continue pumping the actuator, but descent is possible. The operator has to make sure that the actuator is not overloaded.

The linear actuators RH 1250 have 1 location hole Ø 12.1 mm in the plunger and 2 centring pivots Ø 38 mm for the connection of user's constructions.
Besides the standard mounting with centring pivot Ø 38 mm mounted at the housing, the RH 1250 can be delivered with fork mounting or flange mounting.
The user's construction must exclude side loads and forced conditions. The centring pivots Ø 38 mm are unlacquered.

There are two different operating directions of the pump lever. 
Dependent on the operating direction, the admissible mounting positions have to be considered.
Operating direction A
Pump lever counterclockwise (figure 5a)
Admissible mounting positions as per figure 5b.

Operating direction D 
Pump lever clockwise (figure 6a)
Admissible mounting positions as per figure 6b.