Holeless vs Roped Hydraulic Elevators: Key Differences

JDRK’s ascenseur domestique hydraulique is documented as zero-pit or shallow-pit, with a 150 mm minimum pit, no machine room, and no counterweight. What JDRK’s public specifications don’t state is whether its cylinder is holed, holeless, or roped, so those labels shouldn’t be assumed. Confirm cylinder configuration in writing before comparing quotes.
Compared with explainers that define the three hydraulic sub-types without any manufacturer specification attached, this guide separates what is general industry usage from what JDRK has actually published. That matters because “holeless,” “shallow-pit,” and “roped” describe three different design choices, and quotes that use the words interchangeably are hard to compare.

Holed, Holeless, and Roped Compared

The terms below reflect general industry usage; exact designs vary by manufacturer, so treat the table as a vocabulary guide, not a specification.

Dimension	Holed (In-Ground Cylinder)	Holeless	Roped Hydraulic
Cylinder Location	Extends into a bore drilled below the pit floor	Mounted in or beside the shaft; no bore drilled	Cylinder connected to the cab through ropes and a sheave
Site Drilling	Required	Not required	Depends on the roping layout
Cab Travel vs. Ram Stroke	Equal (direct-acting)	Equal or telescoping	Cab travels a multiple of the ram stroke, so the cylinder can be shorter
Main Site Constraint	Ground conditions and groundwater at the bore	Space beside the cab for the cylinder	Sheave and rope clearance overhead
Typical Pairing	Sites where drilling is practical	Retrofits where drilling is impractical	Often combined with a holeless layout

Are Holeless and Roped Mutually Exclusive?

No, and this is the most common misreading of the title question. “Holeless” answers whether a bore is drilled below the pit. “Roped” answers how the cylinder’s motion reaches the cab. A roped design can be holeless, and some manufacturers describe two-cylinder roped layouts as “dual roped holeless.” Choosing between them as if they were rival categories leads to quotes that don’t line up.
A second misreading: zero-pit or shallow-pit does not automatically mean holeless. Pit depth is one measurement; whether a cylinder bore is drilled is another.

JDRK’s Hydraulic Domestic Elevator: Published Specs

Parameter	Published Value
Drive Principle	Pressure-driven rise, gravity-driven descent
Speed Control	Imported high-precision proportional valve; stepless speed regulation
Machine Room	None; installable where top-floor clearance exceeds approx. 2 m
Pit	Zero-pit or shallow-pit options; minimum pit depth 150 mm where a pit is used
Minimum Customized Shaft Size	Approx. 1,100 × 1,100 mm
Minimum Top-Level Height	2,600 mm
Counterweight	None; shaft space utilization up to approx. 70%
Safety Features	Light curtain, overspeed governor, safety gear, one-touch emergency dial, Automatic Rescue Device (ARD)
Certification Marks	SGS, SGC, SGRZ, CNCA, CNAS, ISO 9001 (company-stated; certificate numbers not publicly disclosed)
Prix	Not published; quote required

5 Questions to Ask Before You Compare Quotes

1.Is the cylinder direct-acting or roped, and what is the roping ratio?
2.Is the cylinder single-stage or telescoping?
3.Is any bore drilled below the pit floor, and if so, to what depth?
4.What pit depth applies to my specific configuration: 150 mm, or zero-pit?
5.What top-floor clearance does the ram or sheave assembly need in my shaft?

Getting a Quote That Can Be Compared

JDRK quotes are built around your shaft, pit, and load requirements. Send the five questions above with your shaft measurements so the quote states cylinder configuration explicitly.

FAQ

Is a holeless hydraulic elevator the same as a zero-pit elevator?

No. Holeless refers to not drilling a bore below the pit for the cylinder; zero-pit refers to the pit depth itself. JDRK documents zero-pit and shallow-pit options (minimum 150 mm where a pit is used) but does not state its cylinder configuration.