JENNMAR CORPORATION Patent applications |
Patent application number | Title | Published |
20100310325 | Truss Shoe with Wedge Retaining Sleeve - A truss shoe for a roof support system includes a bolt receiving section, an intermediate section, and a cable engaging section. The cable receiving section has a passageway having a first open end spaced from, and in facing relationship, to the bolt receiving section and an opposite second end, wherein the passageway has a cone-shaped portion having a decreasing diameter as the distance from the first end of the passageway increases to receive a wedge shaped cable retention assembly. The surface of the intermediate section includes a cut out portion that extends from the first opening of the passageway toward the bolt receiving section and terminating at a riser. A locking tube has one end in the passageway in facing relationship to the retention assembly and the other end in engagement with the riser to prevent the retention assembly from moving out of the first opening of the passageway. | 12-09-2010 |
20100266349 | Impact Resistant Lagging, Method For Designing Impact Resistant Lagging, and Apparatus for Testing Impact Resistant Lagging - A steel set assembly includes a first pair of legs and a second pair of legs with the first pair of legs being spaced from and positioned opposite the second pair of legs. First and second beams are provided with the first beam being secured to one leg of the first pair of legs and one leg of the second pair of legs. The second beam is secured to the other leg of the first pair of legs and the other leg of the second pair of legs. A panel is secured to the first and second beams and includes a base having a top surface and a bottom surface, a block having a top surface and a bottom surface, and a pad. The block is secured to the base and the pad is positioned between the top surface of the base and the bottom surface of the block. | 10-21-2010 |
20100054870 | MINE ROOF AND RIB SUPPORT WITH REINFORCED CHANNEL - A mine roof and rib support can be a support member having a roof support arm and a rib support arm, wherein the roof support arm is provided at an angle to the rib support arm. An aperture for a roof bolt is provided through the support member adjacent an intersection of the roof support arm and the rib support arm. A bearing plate having an upper edge and a lower edge, and a through-hole provided therebetween, can be provided wherein the upper and lower edges are positioned in abutment with the roof and rib support arms, respectively, to simultaneously apply force to each arm when a roof bolt is installed through each of the bearing plate and the support member. A flange can be provided at a distal end of one or both of the roof and rib support arms, each flange projecting toward the mine roof or rib. | 03-04-2010 |
20100042381 | Stress, Geologic, and Support Analysis Methodology for Underground Openings - A method of designing supports for an underground mine opening comprising the steps of: receiving mine slope information including at least one of site location, entry length, entry grade, entry orientation, size of opening, surface topology, adjacent borehole data and rock mechanics test data, historical roof fall height, and expected steel set support capacity; conducting stress and geological condition evaluation of the mine opening using a finite element computer modeling program based on the mine opening information; and designing structural supports for the mine opening utilizing the stress and geological condition evaluation of the mine opening. | 02-18-2010 |
20100028088 | BREAKABLE ROCK BOLT - A rock bolt is disclosed, which includes first and second ends, a shaft extending between the ends, the shaft incorporating a hollow metal rod including at least one breaking zone and wherein the shaft is arranged to preferentially break in the breaking zone when impact loading is applied to the shaft. | 02-04-2010 |
20090317197 | Tension Assembly - A tensioning assembly | 12-24-2009 |
20090074517 | End Coupling for a Rock Bolt - An end coupling | 03-19-2009 |
20090074516 | Self Drilling Rock Bolt - The present invention relates to a self drilling rock bolt which may be used in mining applications. | 03-19-2009 |
20090041550 | Expansion bail anchor and method - An expansion anchor assembly for a mine roof bolt having a tapered plug, expansion leaves, a bail and a removable holding ring configured to hold the expansion anchor assembly in an assembled position is disclosed. The tapered plug is configured to be threaded onto the mine roof bolt and defines plug channels to encourage symmetrical resin flow past the tapered plug. The bail defines a medial opening through which the mine roof bolt extends. | 02-12-2009 |
20090003940 | System And Method For Mine Roof Counter Bore And Cable Bolt Head Securement Therein - A mine roof support includes a plate having a raised portion with an opening, and a mine and roof bolt, e.g. a barrel having a drive end and an opposite second end, and wedge assembly. The plate mates with a recess in a mine roof. In one embodiment, the second end of the barrel extends through the opening in the dome into a bore hole in the mine roof. In another embodiment, a second end of the mine bolt is contoured to match and fill the inner contour of the dome. A drill bit tool used to shape the recess includes a first bit, a second bit, and a third bit between the first and second bits to drill a bore hole, enlarge the end of the bore hole to receive the second end of the mine bolt, and to drill the recess. | 01-01-2009 |
20080260472 | Resin Groutable Expansion Anchor and Method of Installing Same - A rock bolt and a method of installing a rock bolt in a borehole ( | 10-23-2008 |
20080251296 | Countersink Roof Bit Drill And Method For Using The Same - A roof bit drill has a central shaft with a front end and a back end. The drill also has a base secured about the central shaft proximate to the front end, wherein the base has clearance channels extending axially therethrough. At least one cutting element is arranged on the base in a convex cutting pattern to permit loosened material to be evacuated. The roof bit drill may further include a drill depth locator to identify when the drill has been advanced within a mine roof to a predetermined depth. A method for using the roof drill bit is also disclosed herein. | 10-16-2008 |
20080247828 | Cable Bolt - A cable bolt ( | 10-09-2008 |