A heavy duty punch for piercing armor plate and the like has a shank by which the punch may be held when in use and a piercing end projecting axially from the shank. The piercing end terminates in a sharp-edged tip. The tip is connected to the shank by a reduced-diameter portion defined by a curved sidewall extending axially from the tip toward the shank and a straight-sided sidewall extending axially from the curved sidewall toward the shank. The straight-sided sidewall is spaced from the tip a...

A swivelable journal bearing for a shaft of a converter or other heavy-duty equipment comprises a spherically convex inner ring on the shaft and an annular array of rigidly interconnected socket elements each forming at least one seat for an inwardly projecting low-friction insert having a spherically concave face in contact with the ring surface. The socket elements may be short tubes welded to one another or embedded in a shell of concrete; they could also be perforated strips welded together ...

A heavy duty shackle for use under great loads, such as in anchor lines. The shackle is formed from a cylindrical bar rod by shaping the ends to a reduced diameter, and forging the central portion into a flattened shape having the cross-section of a wide shallow U shape. The bottom surface of the central section is in the form of a portion of a circular cylinder. The ends of the bar are flattened and a central opening is forged and based for a pin. The formed bar is then bent in the form of a bo...

A heavy duty pneumatic tire comprises a tread portion having a pitch pattern and provided with at least two circumferential main grooves extending circumferentially of the tire, wherein at least one dimple is arranged in a region of an island part ranging from a side end of the tread to a position corresponding to not more than 20% of a tread width per one pitch, and a pair of sipes are disposed at opposed positions of each dimple to a widthwise direction of the tire so as to extend in the width...

A circuit for determining the duty cycle of a control signal includes an oscillator that operates at a frequency that is a predetermined multiple of ten higher than the frequency of the control signal. The oscillator output is connected to the count input of a digital counter, and the control signal is connected to a count inhibit input of the counter. Thus, the counter only counts the oscillator output pulses during the active interval of each cycle of the control signal. Timer means are provid...

A rearview mirror includes a mirror body pivotally connecting thereto a securing frame mounting therein a rotatable carrier mounting therein a transparent glass capable of being set in rotation by an energized motor. When the securing frame is held against a door window of a vehicle, the transparent glass will be rotated and enable the driver to clearly see the rearview mirror through the door window and the transparent glass in a rainy or snowy day. The height of the securing frame can optional...

In a heavy duty pneumatic tire, a protrusion is disposed in an intersect portion between circumferential groove and transverse groove in a tread of block pattern, whereby stone capturing is prevented. Furthermore, blind sipe is formed in each block of at least center and second block rows, whereby heel and toe wear as well as shoulder wear are prevented.

A precision heavy duty indexer characterized in that the indexing member thereof is positively locked to the indexer housing in desired precise axial, radial and angular indexed position by interengaged gear means of said indexing member and said housing, and is unlocked for indexing movement by disengaging said gear means, the gear means of said housing being carried by the outer peripheral portion of a laterally flexible pneumatic or hydraulically-actuated diaphragm having its inner peripheral...

In a heavy duty pneumatic tire having a lug pattern and used for truck, bus, construction vehicle and the like, at least two lug grooves located in each half region of the tread portion are connected to each other through an auxiliary groove containing a step protrusion therein, and the widths and depths of the auxiliary groove and step protrusion satisfy particular relationships.

Heavy duty spools having the capacity to hold at least about 375 to 675 pounds of product, such as between about 2,800 and about 3,000 unfilled plastic or paper bags which are sized to hold disposable diapers, are disclosed. The heavy duty spools of the instant invention are preferably fabricated from paperboard materials and include two flange plates connected by a hollow outer core. The hollow outer core is formed from a plurality of corrugated interlocks, each having locking arms on the ends ...