Did You Know...
...that two musicians were responsible for the invention of color print film? Fascinated by photography, Leopold Godowsky and Leopold Mannes worked together to produce an easy-to-use, practical color film. They worked full time as music teachers and gave concerts while experimenting during their off hours in Mannes' kitchen. Their success earned them full-time, well-paying jobs at Kodak and their efforts resulted in Kodachrome film, which was introduced in 1935.
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| Number | Title | Issue Date |
| 7232103 | Load-bearing pressurized liquid column A load-bearing, pressurized-fluid column apparatus and method for supporting a load or mine ceiling with respect to a support surface or mine floor includes an elongated, flexible sleeve and bladder retain a substantially incompressible liquid. The sleeve and bladde... | 06/19/2007 |
| 6395359 | Power cylinder non-metallic liner seal assembly Corrosion resistance is provided for a power cylinder by providing a preloaded molded urethane elastomer sleeve liner within an outer cylinder of material such as a copper/nickel alloy which is subject to corrosion from long-term exposure to ambient fluid... | 05/28/2002 |
| 5961254 | Hydraulic advancing support frame An advancing support frame is connected to the face conveyor (9) via an advancing rod (7) engaging with the advancing cylinder (5). A lifting cylinder (10) is supported on the advancing rod (7), with which the base shoes (1) are lifted during the advancin... | 10/05/1999 |
| 5348425 | Piston cylinder device with a protective coating and method of producing such a coating A method is described for protecting piston cylinder devices against corrosion by a pressure resistant thermoset or cured material coating. At least the outer and inner cylindrical surfaces, for example, of a mine prop, that cooperate with a sealing devic... | 09/20/1994 |
| 5252006 | Mine roof support A mine roof support employs a pair of floor skids carrying hydraulic props on which a roof-engaging structure is mounted. A goaf-shield is pivotably mounted to the roof-engaging structure and is connected with a lever system to the floor skids. A shifting... | 10/12/1993 |
| 5190414 | Walking prop for mine tunnels A walking mining prop has a skid-lifting assembly in the region of the ram which braces the roof cap with respect to the skid formed by a bridge from which lifting cylinders are articulated and suspended. The pistons of these lifting cylinders are articul... | 03/02/1993 |
| 5133626 | Mobile stope support apparatus The mobile stope support apparatus comprises a number of individual units (10) which are interconnected by hydraulic cylinders (12). Each of the units (10) has a series of upright, double-acting legs (20). The legs (20) have independent bases of rounded s... | 07/28/1992 |
| 5100263 | Mine roof support assembly A mine roof support includes a ground engaging base section, a roof engageable canopy, and hydraulic props for raising and lowering the canopy relative to the base section. An advancing mechanism is provided for advancing the roof support towards the mine... | 03/31/1992 |
| 5039257 | Mine roof supports Mine roof support comprising a base including a pair of skids, a roof engaging canopy, jacks acting between the base and the canopy, an auxiliary jack connected to the base for lifting or lowering at least part of the base when the support advances and a ... | 08/13/1991 |
| 4946316 | Method and device for moving a shield-type support trestle A method and device is provided for the moving of a shield-type support trestle 1 having stamps 4, 5 arranged between a roof pressure cap 3 and a lying skid 2, a pushing ram 6 is in the lying skid 2, and control valves 11, 12, 13, 14 for controlling the d... | 08/07/1990 |
| 4662796 | Supporting pillar for mines The invention relates to a travelling support pillar for use in underground mines. The support pillar has a link subjected to the action of a positioning jack. The positioning jack extends between a gate and the rear of the top of the pillar. The position... | 05/05/1987 |
| 4605341 | Mine roof support and attachment means therefor Attachment means are provided for attaching a mine roof support to an abutment, (e.g. a flexible conveyor) the attachment means comprising a ram arrangement in the form of at least two rams 25, 26 operable to effect relative movement between the mine roof... | 08/12/1986 |
| 4600340 | Mine roof support unit A mine roof support unit includes a pair of generally parallel floor girders, and an advance mechanism positioned between the floor girders. The advance mechanism comprises a hydraulic advance ram and a guide rod system. The advance ram is pivotally conne... | 07/15/1986 |
| 4568222 | Mine-roof supports A mine-roof support has a floor beam, an advancing ram and a relay bar. A bell-crank lever is pivotally-connected to the floor beam and the advancing ram is pivotally-connected to the bell-crank lever. One arm of the bell-crank lever has a member which ma... | 02/04/1986 |
| 4557635 | Shield-type support frame A shield-type support frame for serving as a face support in underground mining operations having a bottom structure, a one-piece roof cap, at least one hydraulic plunger connecting the bottom structure and the roof cap and two shield elements arranged si... | 12/10/1985 |
| 4526495 | Mine roof support assembly A mobile mine roof support assembly has three mine roof support units coupled together by a common transverse beam. Roller devices are mounted beneath the floor sills of the support units. The roller devices are spring biased away from their floor sills s... | 07/02/1985 |
| 4480946 | Gob canopy for a mine roof support A support for the roof in longwall mining operations includes a gob canopy at the rear of a roof canopy. The gob canopy can move about a vertical pivot and a horizontal pivot by operation of a hydraulic actuator. To stabilize the support, the gob canopy m... | 11/06/1984 |
| 4380410 | Mine-roof support A self-advancing mine roof support has a beam-like abutment adapted to be disposed generally adjacent and parallel to a work face. Three roof support elements are spaced apart along the abutment and are pivoted to the abutment. The abutment may be angled ... | 04/19/1983 |
| 4348138 | Sliding supporting gallery A gantry support for supporting a roof of a passage is advanceable along a floor of the passage. The support has two parallel supporting elements mutually spaced apart laterally of the support, each element including at least two pairs of frames provided ... | 09/07/1982 |
| 4311417 | Mine roof support A self-advancing, hydraulically powered mine roof support comprises a base means, a double-acting hydraulic advancing ram extending in the intended direction of advance of the support in use, the cylinder of the advancing ram being located towards the for... | 01/19/1982 |
| 4307982 | Mobile mine roof support system A mobile self-propelled mine roof support system employing pairs of individually self-propelled roof support units movable along opposite ribs of a mine room to follow an advancing mine face. Each support unit comprises an elongated, wheel-mounted frame p... | 12/29/1981 |
| 4274764 | Mine roof supporting system A stabilizing arrangement for mine roof support systems of the type in which a series of support units, each including a transverse beam supported at opposite ends by extensible props, are interconnected by extensible struts in a manner to be self-advanci... | 06/23/1981 |
| 4118939 | Mine roof support This invention provides a mine roof support in which the cover, or canopy, is connected to a framework in such a way that the canopy can tilt relatively to the framework both in the fore-and-aft sense of the support and from side to side of the support. T... | 10/10/1978 |
| 4095432 | Mine roof supports A mine roof support comprises a plurality of hydraulically extensible chock legs attached at their upper ends to one or more elongate roof bars by means of a projection on each chock leg passing through an aperture in the underside of the roof bar(s) to b... | 06/20/1978 |
| 4094153 | Breast roof support system for longwall mining In a longwall mining operation the roof of the breast extending laterally from a heading or gangway is supported by at least two pairs of pit props. Each pair is substantially identical, having an elongated upper part and an elongated lower part displacea... | 06/13/1978 |
| 4062194 | Mine roof supports A roof-engaging assembly for a mine roof support having prop or jack means to engage and support the roof-engaging assembly, comprises a rigid part to engage said prop or jack means, and a roof-engaging part positioned over and resiliently urged away from... | 12/13/1977 |
| 4027489 | Mine roof support A mine roof support comprising a roof engaging canopy, a floor-engaging means, a pair of shields pivotally secured to the canopy and extending downwardly and rearwardly in side-by-side relation over the floor-engaging means, a quadrilateral linkage securi... | 06/07/1977 |
| 4008578 | Pit prop assembly A pit prop assembly for use in a mine having a floor, a roof, and a face, comprises a pair of pit props having parallel elongated floor-engaging bases on each of which is pivoted a roof-engaging arm which may be pressed against the roof by means of a hydr... | 02/22/1977 |
