摘要:
An endless power transmission belt construction and method of making the same are provided, the belt construction comprising an outer tension section, an inner compression section and a load-carrying section secured to and disposed intermediate the tension section and the compression section, the compression section having an inner surface defining a plurality of longitudinally disposed and alternately spaced apart projections and grooves and a plurality of transversely disposed and alternately spaced apart projections and grooves. Each transverse groove has a depth between approximately 0.070 of an inch and approximately 0.080 of an inch and is spaced from the next adjacent transverse groove thereto by a distance between approximately 0.3 of an inch and approximately 0.4 of an inch while each longitudinal groove has a depth of approximately 0.095 of an inch and is spaced from the next adjacent longitudinal groove thereto by a distance of approximately 0.140 of an inch.
摘要:
An elastomer coated bias fabric for reinforcing power transmission belts and the like is disclosed wherein one surface of the fabric is provided with an uncured, tacky, elastomeric composition. The fabric is prepared by pre-impregnating the fabric, transversely stretching the fabric on a tenter frame, coating a latex composition on both surfaces of the fabric while maintaining the fabric in its transversely stretched condition, and after drying the fabric, overcoating one surface only of the coated fabric with a tackified, latex composition which may contain a chemical linking agent which enhances the bond between the elastomer and the fabric by forming a chemical bridge between them. A method for manufacturing coated fabric is also disclosed.
摘要:
An endless power transmission belt construction having power transmitting contact faces and method of making the same are provided, the belt construction comprising an axial tensioning unit, a plurality of lateral stiffening units carried by the tensioning unit, and friction material carried by the units, the tensioning unit and the stiffening units being formed of material that provides an axial and lateral stiffness in excess of that normally provided by polymeric friction material that normally forms the main body of a belt construction that is reinforced with such a tensioning unit and stiffening units. The friction material has a first portion thereof disposed on the units to define the contact faces thereof and has a remaining portion thereof disposed on the units to at least assist in securing the first portion to the units, the thickness of the first portion of the friction material being relatively thin and the thickness of the remaining portion being no thicker than the thickness of the first portion whereby a substantially large amount of the belt construction comprises the material of the units and a substantially small amount of the belt construction comprises the friction material.
摘要:
A belt pulley and method of making the same are provided, the pulley having a hub and a peripheral groove for receiving part of an endless belt therein that is to drive the pulley or be driven thereby whereby the pulley is adapted to be rotated about the axis of the hub. The pulley has a plurality of vanes extending outwardly from at least one of the opposed sides thereof, the vanes comprising a plurality of spaced apart curved vanes of substantially the same size and shape and disposed in a plurality of circular arrays that are generally concentrically disposed relative to each other about the axis and on the one side of the pulley for acting on fluid adjacent the pulley to tend to cool the pulley with the fluid. The curved vanes in each circular array are each disposed substantially evenly between an adjacent pair of curved vanes in the circular array adjacent thereto whereby the number of the curved vanes in each circular array is the same, each curved vane having a convex side and a concave side. The concave side of each curved vane generally faces the axis and is substantially non-symmetric about a radial line intersecting its midpoint and the convex side of each curved vane generally faces in the direction of the peripheral groove.
摘要:
A crimping die assembly comprising a plurality of die fingers, a holding unit for holding the die fingers in a working relationship, the holding unit comprising a retaining ring having a plurality of substantially evenly spaced openings for receiving the die fingers therein for holding the die fingers at one end of the die assembly, each die finger having a connecting part connecting the die finger to the retaining ring, each connecting part permitting radial movement of its respective die finger with respect to the central axis of the retaining ring, and a springing arrangement integrally associated with the connecting parts tending to force the die fingers radially outwardly with respect to the retaining ring, the top surfaces of the die fingers extending beyond the top surface of the retaining ring so as to receive pressing forces directly from a ram through a pusher ring that engages the top surfaces of the die fingers when the crimping die is used to crimp a workpiece.
摘要:
A tensioner for a power transmission belt that is adapted to be operated in an endless path and a method of making the same are provided, the tensioner comprising a support unit for being fixed relative to the belt, a belt engaging unit carried by the support unit and being movable relative thereto, a mechanical spring unit operatively associated with the support unit and the belt engaging unit for urging the belt engaging unit relative to the support unit and against the belt with force to tension the belt, and a dampening unit operatively associated with the support unit and the belt engaging unit to dampen the movement of the belt engaging unit relative to the support unit, the dampening support unit comprising a shaft. The dampening unit and the spring unit are coaxially spaced apart and coaxially aligned on the shaft with the belt engaging unit having a portion thereof disposed between the dampening unit and the spring unit and being rotatably carried by the shaft.
摘要:
A holddown bar for a hatch cover of a railroad car or the like and a railroad car utilizing such a holddown bar are provided, the holddown bar having opposed sides and opposed ends one of which is adapted to be pivotally mounted to the car and the other of which is adapted to be releasably latched to the car while a medial portion thereof intermediate the opposed ends is adapted to extend across the hatch cover and carries a sealing gasket in a channel thereof that is adapted to engage against the hatch cover, the holddown bar having a rain shield secured to one of the opposed sides thereof at the medial portion and opposed ends thereof so as to be adapted to be disposed adjacent and outboard of an end of the hatch cover for protecting the same from the elements. The rain shield comprises a one-piece member formed of a relatively flexible polymeric material.
摘要:
A belt construction provided, the belt construction comprising a tensile member intermediate the opposed sides of the belt construction, a plurality of teeth defining one of the opposed sides of the belt construction and being mainly formed of a first polymeric material that has reinforcing fibers therein, the belt construction having a land area between adjacent teeth, and a backing member defining the other of the opposed sides of the belt construction, the backing member being mainly formed from a second polymeric material that is initially separate from the material of the teeth and is substantially free of fibers therein, the material of the backing member having a surface that joins with a surface of each tooth whereby the joining surfaces define an interface line therebetween, the interface line in each land area having a portion thereof disposed spaced from the tensile member on the side thereof opposite to the side thereof that faces toward the teeth.
摘要:
An endless power transmission belt having a toothed compression section and method of making the same are provided, the belt being formed substantially of polymeric materials and comprising a tension section, a compression section, and a load-carrying section disposed between the tension section and the compression section and having a transverse centerline, the compression section having an outer layer and an inner layer joined to the outer layer and defining an interface therewith that is substantially uniformly spaced from the load-carrying section by the outer layer throughout substantially the entire width and length of the belt. The compression section has an inner surface in the form of alternating transverse teeth and grooves with the grooves respectively defining the roots of the teeth. The inner layer of the compression section is softer than the outer layer thereof and the roots of the teeth are spaced inwardly from the interface of the layers so that the root of each tooth is spaced from the interface of the layers a distance that is approximately 25% of the distance of that tooth from the centerline of the load-carrying section whereby the inner layer tends to prevent cracking of the belt in the toothed area thereof.
摘要:
A system for fastening a rail to a foundation such as railroad ties or sleepers to form a railroad track. The system includes L-shaped inserts which are imbedded into the foundation and extending above it, supports which are laterally located with respect to the rails, and a fastening member or clip securing the rails. The main portion of each clip is mounted between the insert and the foundation, and one end contacts the upper surface of the supports. The other end of the clip contacts the flange of the rail, and has an offset lower surface which applies vertical and lateral pressure to the edge of the flange. The clip is made of a metal material and is a resilient spring having a multiple curved cross-section in order to apply compressive forces to the rail flange, the curved portions having undulating portions which make the various contacts.