A multi-purpose lift device for use with vehicles and the like to elevate portions thereof, the device consisting of three concentric spaced apart telescoping pipe sections identified as an outer pipe section, an intermediate pipe section, and an inner pipe section, the outer pipe section being supported in a vertical position on a base, a cable supporting winch affixed to the outer pipe section adjacent the top end thereof, a pair of aligned tandemly disposed pulleys diametrically affixed to opposite points at the bottom end of the intermediate pipe section, a pulley affixed to the top end of the intermediate pipe section and in vertical alignment with one of the bottom pulleys, a pulley affixed to the top end of the outer pipe section adjacent the winch, the cable being reeved over the outer pipe section pulley and thence about the intermediate pipe section bottom pulleys and thence about the intermediate pipe section top pulley and thence secured to the bottom end of the inner pipe section such that operation of the winch effects the simultaneous lifting of the intermediate and inner pipe sections relative to the outer pipe section in a manner telescoping outwardly therefrom.
The present invention relates to an adjustable support element for use in underground mining or tunnel construction, particularly for securing mining cavities at the longwall face and headway. The invention is a single use prop made of inner and outer telescopable tubes which can be filled with a hardenable building material core. The tubes have drainage boreholes for draining excess water from a liquid filling material pumped within the tubes after the prop has been braced between the roof and floor of the mines. Plural bands connected between the outer and inner tubes enable the telescopic movement of the tubes.
A telescopic device with two telescopic members (1, 2) comprises a control means with a flexible transmission element (4) for bringing the telescopic members in relative movement. The transmission element (10) is in engagement with a driving wheel (5), which is fixed relative to one (1) of the telescopic members in that the driving wheel is journalled at a base part (3) attached to said one telescopic member and from which the transmission element extends in a loop, which is arranged about a diverting wheel (8) arranged within a space limited by the telescopic members. The diverting wheel (8) is likewise fastened relative to the first telescopic member (1). The second telescopic member (2) is connected to a part (10) of the transmission element which extends between the driving member (5) and the diverting member (8), whereby thus a rotation of the driving member in a first direction causes contraction of the telescopic members while a rotation of the driving wheel in a second direction causes extension of the telescopic members.
A lifter is constructed to include a hollow main upright, a frame pivoted to the main upright to carry a hand winch, a link coupled between the frame and the main upright, a hollow auxiliary upright axially movably mounted in the hollow main upright, a lifting upright axially movably mounted in the hollow auxiliary upright, two first pulley blocks coupled between the hand winch and the hollow auxiliary upright and adapted to lift the hollow auxiliary upright upon operation of the hand winch, and two second pulley blocks coupled between the hollow main upright and the lifting upright and adapted to lift the lifting upright upon operation of the hand winch after the hollow auxiliary upright has been extended out of the hollow main upright.
The invention comprises a panel lifting apparatus having at least three telescoping elongated sections telescoping into one another and all telescoping into a non-telescoping elongated frame member. Three separate chain length segaments not directly connected to one another act to raise and lower the telescoping sections. The first chain segament has its upper and lower end mounted to the upper and lower end of the first telescoping section. The second chain segament has its upper end connected to the upper end of the non-telescoping section and its lower end connected to the lower end of the second telescoping section. The third chain segament has its upper end connected to the upper end of the first telescoping section and its lower end connected to the lower end of the third telescoping section. The non-telescoping section has a gear drive with its output gear engaging the first chain segament to raise and lower the first chain segament to thereby raise and lower the first telescoping section. The raising and lowering of the first telescoping section raises and lowers simultaneously the second and third telescoping sections through the chain segament connections.
A mechanically operated, cable driven jack includes a base, a hollow upright support member secured to the base, a first hollow support tube telescopically received in the support member, and a second hollow support tube telescopically received within the first support tube. The first and second support tubes are interconnected by means of a cable and a series of sheaves and driven by a winch employing a worm gear drive principle so as to move the first and second support tubes from collapsed condition to an extended position. Safety means are also provided to limit the downward movement of the tubes and the arrangement of the pulley sheaves and the cable drive is such that upward movement is also controlled. Modifications of the jack include the provision of selected alternate attachment points for the free end of the cable so as to enable the jack to be modified for fast or slow movement, depending upon the precise engagement point of the free end of the cable. A further feature of the invention is the provision of an improved saddle capable of use with any of the forms of the invention and also capable of adjustment to accommodate varying sizes of transmissions and of tilting in several planes so as to facilitate removal of the transmission from particularly restricted environments, depending upon the make and model of the vehicle involved.
