|Section installing pitch, m.||1,5||1,5||1,5||1,5|
|Quantity of hydraulic props in the section, pcs.||4||4||4||4|
|Installation height of the section, mm.||1000…2100||1150…2400||1300…2700||1400…3100|
|Resistivity of the support, kN/m², not less||900…940||880||900||850|
|Section resistance, kN, not less||6300||6325||6850||6450|
|Average ground pressure, MPa, not more||2,5||2,5||2,5||2,5|
|Operating pressure, MPa||40||40||40||40|
|Section advance pitch, m.||0,8||0,8||0,8||0,8|
|Section weight, t.||11,1||12,0||13,5||15|
The powered support 1М4 consists of four-props sections with the barrier, equipped with the rigid-linked or controllable visor with four-chain linking system of the basis with the barrier; the basis – rigid-linked catamaran-type; extension ceiling and barrier boards – one-sided or double-sided. It is equipped with the device for face keeping by extracting seam thickness above 2.5 m.
It differs from the supports with the reverse advance scheme – the section advance is carried out with plunger end of the hydraulic cylinder. In comparison with two-props single-row supports it has reduced weight through more equitable load distribution by four props. Almost vertical installation of hydraulic props is ensuring constant resistivity in the whole working power range.