Abstract: A lower works construction for a machine such as a large mining shovel or dragline having a center journal and an upper frame rotatable about a vertical axis of its center journal generally consisting of a lower frame section having a housing for the center journal, a plurality of leg sections mounted on the lower frame section and projecting laterally therefrom and a pair of propelling unit support frame sections, the lower frame section having a plurality of radially projecting bulkheads emanating from the center journal housing, the leg sections having laterally projecting bulkheads disposed in registry with the radially projecting bulkheads of the lower frame section and the support frame sections having laterally projecting bulkheads disposed in registry with the laterally projecting bulkheads of the leg sections whereby vertical and radial loads applied to the upper frame and imposed on the lower frame section will be transferred through the lower frame section to the support frame sections along the bu

Abstract: A system comprising a read-only memory storing output data relating to the stitching movement of the needle for a plurality of stitch patterns or to the feeding movement of the feed dog for the stitch patterns and order instructing data specifying the order in which the output data is to be read out, the output data and order instructing data being stored in the memory as divided into bight relating data and feed relating data, and an address unit including a bight register and a feed register. Based on the data read out from the memory with each advancement of the stitching and feeding timings alternately given in timed relation to the machine main shaft, the register stores the address data for the data to be read out with the next same stitching or feeding timing. When forming a stitch pattern such as a symmetric pattern which requires the use of data codes representing the same amount of movement, the same stored data is repeatedly read out according to the order instructing data.

Abstract: A power shovel comprising a support unit: a stiffleg operatively connected to the support unit for pivotal movement about a stiffleg pivot axis, the stiffleg comprising a pair of transversely spaced, longitudinally disposed side beams each having an I-shaped cross-sectional configuration including upper and lower flange portions and an interconnecting web portion, a cross-piece section interconnecting the side beam sections and a web section interconnecting the web portions of the side beam sections; a handle operatively connected to the stiffleg for pivotal movement about a handle pivot axis; a dipper mounted on the handle; a crowd system operatively connected to the handle for crowding and retracting the dipper; and a hoist system for hoisting and lowering the dipper comprising at least one upper fluid actuated rod and cylinder assembly operatively connected at a lower end thereof to the stiffleg and operatively connected at an upper end thereof to the handle on one side of the handle pivot axis, at least o

Abstract: A method of making a sight glass assembly generally including forming a housing having an opening therethrough provided with an annular wall, forming a lens having an annular peripheral wall provided with a diameter greater than the diameter of the housing wall at predetermined equilibrium conditions, effecting a change in the predetermined equilibrium conditions of the lens and housing sufficient to cause a dimensional change between the diameters of the housing and lens walls sufficient to permit the insertion of the lens into the opening of the housing, inserting the lens into the housing opening while maintaining the change in conditions so that the lens wall is positioned in opposed relation to the housing wall, and maintaining the lens in the opening with the lens and housing walls disposed in opposed relation while permitting a return to the equilibrium conditions of the lens and housing whereby the housing and lens wall will engage to place the lens in radial compression and form a fluid tight seal th

Abstract: A sight glass assembly including a housing structure mountable on a vessel for containing fluid, the housing structure having an opening therethrough, the opening having an enlarged section providing a shoulder, a face plate having an opening registered with the opening in the housing structure, mounted on the housing structure so that a portion thereof is disposed in opposed relation to the shoulder, a lens disposed in the enlarged section of the opening in the housing structure and interposed between the shoulder and the portion of the face plate, a packing member disposed in the enlarged section of the opening between the housing structure and the periphery of the lens, the packing member being hollow and filled with a fluid and means for securing the face plate to the housing structure and applying a force on the packing member causing the packing member to exert a uniform compressive force about the periphery of the lens and effect the seal between the housing structure and the periphery of the lens.

Abstract: A method of making a sight glass assembly generally including forming a housing having an opening therethrough provided with an annular wall, forming a lens having an annular peripheral wall provided with a diameter greater than the diameter of the housing wall at predetermined equilibrium conditions, effecting a change in the predetermined equilibrium conditions of the lens and housing sufficient to cause a dimensional change between the diameters of the housing and lens walls sufficient to permit the insertion of the lens into the opening of the housing, inserting the lens into the housing opening while maintaining the change in conditions so that the lens wall is positioned in opposed relation to the housing wall, and maintaining the lens in the opening with the lens and housing walls disposed in opposed relation while permitting a return to the equilibrium conditions of the lens and housing whereby the housing and lens wall will engage to place the lens in radial compression and form a fluid tight seal.