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Hole Type |
Description:
This application will accommodate front openings as well
as front and rear opening configurations. This is the
traditional hydraulic design used for decades. The hydraulic
cylinder (Jack) is in the ground directly under the Car
platform. This arrangement can accommodate high low capacity
cars for both passenger and freight applications.
Advantages:
Generally the lowest material cost application if the
Jack is a single stage unit. This Car Type is generally
the simplest to design and easiest to install.
Disadvantages:
A single stage cylinder must go down into the ground roughly
the same distance as the desired travel. Possible oil
contamination in the ground is the most detrimental aspect
of this car type. Precautions can be taken in the form
of encapsulating the Cylinder within PVC pipe. High seismic
activity areas will experience the greatest risk of under
ground cylinder leakage. In some geographic areas, the
cost of drilling a jack hole can be very expensive, if
it is possible at all. |
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| Holeless |
Description:
This arrangement allows for a 1 to 2 roped ratio. That
means that for every 1 foot of movement by the Piston,
the Car moves 2 feet. Here the Jacks, with all the associated
Rope equipment, are located on each side of the Car. As
was the case with the Twin Jack Holeless, maximum structural
strength is attained with this arrangement and high capacity
cars can be accommodated. This design can accommodate
both passenger and freight elevator applications.
Advantages:
No Jack holes are required even though the travel can
be as great as 100 feet. Without any Jacks in the ground,
the risk of oil contamination in the ground is eliminated.
No extensive pit or overhead is required. Because of the
1 to 2 roped arrangement, the Jack’s length is roughly
equivalent to half of the Travel. The jack also moves
at one half the speed of the car. High capacity Cars can
be accommodated.
Disadvantages:
Additional hoistway width may be required to accommodate
the Jack and Rope equipment installed on both sides of
the Car. The installation time is greater than that of
hole type applications because of the additional equipment
(Ropes, Safeties, Governor, and Sling). |
 
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