Hydraulic torque wrench system
View Patent ↗A hydraulic torque wrench having a separate ratchet unit and hydraulic cylinder drive unit connectable by an overlapping cylindrical connection at selected angles of rotation providing clearance in use. The hydraulic cylinder actuates the ratchet mechanism by a connecting rod traveling through the overlapping cylindrical connection and engaging a pivotable drive plate. The ratchet may have a male drive shaft for driving a socket, or a female driver such a hex or spline wrench. The ratchet unit case may be integral, or split for removable accesses to the ratchet mechanisms. The cylinder unit hydraulic connections may be separate rotatable connections or a single connection and collar, allowing three-way rotation. Attachments for the hydraulic unit include a pipe flange spreader, a nut splitter, scissor action shears, and a lift/spreader for lifting an object from a flat surface or spreading surfaces apart. A reaction bar affixes to the drive unit body.
1. A hydraulically operated flange spreader comprising:
a hydraulic drive unit having a generally cylindrical body having a front wall and an end cap and defining a hydraulically operated piston driving a piston rod, said front wall having an axially located bushing for reciprocally supporting said piston rod, said piston rod having an actuating end opposed to said piston, said piston rod actuating end having opposing connectors extending from the periphery of said actuating end having a threaded bore for threadingly receiving a hub screw, said cylindrical body having a female cylindrical boss extending axially from the front wall of said cylindrical body; and
a flange spreader for spreading flanges after removal of fasteners comprising:
a wedge rod having an upper end and a lower end, said lower end having a wedge connected thereto, said wedge having a lower edge oriented for insertion between flanges;
a horizontally disposed, elongated spreader plate having a lengthwise central axis and an upper surface, a lower surface, and a peripheral edge surface and having a wide central portion tapering to two relatively narrow opposed end portions, said spreader plate tapering from said central portion to said end portions, respectively, said spreader plate defining a large centrally located aperture for receiving a cylindrical male connector body, and a plurality of spaced vertical bores located along said central axis at each end portion of said spreader plate;
a threaded rod extending vertically through one of said plurality of spaced vertical bores at each of said end portions of said spreader plate, each said threaded rod being diametrically attached as by welding to a respective pin ring having an outer circumferential peripheral surface thereof such that said pin rings extend downwardly;
a horizontally disposed pin of such length and diameter as to be collectively received and supported by said pin rings;
a tightening nut located on each said threaded rod above said spreader plate, and a horizontally disposed pin extending through said pin rings;
a cylindrical male connector body extending vertically through said centrally located aperture and extending upward for axial insertion within said female cylindrical boss, said cylindrical male body having a collar extending from its base, said collar being at least partially countersunk into said spreader plate through its lower surface; and
an inverted “U”-shaped piston connector mounted on the upper end of said wedge rod and having such size as to be received in said piston rod actuating end connectors and removably attached thereto by a hub screw;
said female boss being removably mountable over said male connector body and having a plurality of radially directed, circumferentially spaced, threaded through-bores and said male cylindrical body having a plurality of outward opening, radially directed, circumferentially spaced bores corresponding in location to said bores of said female cylindrical boss; and
said female boss and said male connector body having a plurality of connecting pins, each having an outer threaded portion and an inwardly tapered inner portion, each pin being threadably insertable through said through-bore of said female boss and into a said tapered male body bore such that said female boss and said male connector body may be connected at one of a plurality of selected radial angles;
whereby said pin is removed from said rings, said flange splitter is aligned such that said edge of said wedge is located at the connected surfaces of two flanges having all fasteners removed, said threaded rod is extended on opposite sides of the connected flanges so as to align the depending rod rings with aligned fastener bores of said connected flanges, said threaded rod is placed through the depending rings and tightened against the outer peripheral surfaces of said connected flanges by means of said tightening nuts pulling said flange spreader plate and thereby said wedge against said flange connection, and applying hydraulic pressure against said wedge thereby separating said flanges.
2. A hydraulic nut splitter comprising:
a hydraulic drive unit having a generally cylindrical body having a front wall and an end cap and defining a hydraulically operated piston driving a piston rod, said front wall having an axially located bushing for reciprocally supporting said piston rod, said piston rod having an actuating end opposed to said piston, said piston rod actuating end having opposing connectors extending from the periphery of said actuating end having a threaded bore threadingly receiving a hub screw and surrounding a spherical bore, said cylindrical body having a female cylindrical boss extending axially from the front wall of said cylindrical body; and
a nut splitter unit comprising:
an elongated housing having a nut receiving head portion, a cutter head recess portion, a neck portion and a male cylindrical drive connector portion, said head portion, said cutter head recess portion, and said neck portion having upper and lower horizontal faces, said male cylindrical drive connector portion defining a central axis extending through said neck portion;
said neck portion and said male cylindrical drive connector portion defining a bore extending axially therethrough;
a wedge rod slidingly mounted within said bore and having a forward end portion having a replaceable cutter secured therein, said cutter having a cutter head extending forward therefrom a distance about equal to the minimum thickness of a nut wall, said wedge rod having an axially located rear piston rod receiving boss extending from the rear thereof;
said nut receiving head portion defining a generally cylindrical nut receiving opening extending between said upper and lower faces and having a nut bearing forward flat opposite said wedge rod;
said cutter head recess portion defining a rectangular cutter head recess extending between said upper and lower faces and opening into a nut receiver opening, said cutter head recess having a width sufficient to provide clearance for said wedge rod to extend therethrough;
said cutter head being triangular in cross section forming a vertically oriented forward splitting edge extending toward said nut bearing forward flat;
said rear piston rod receiving boss having a spherical connector configured for actuated connection with said piston rod actuating end opposing connectors by means of a hub screw and said spherical bore;
said male cylindrical portion having a plurality of outward opening, radially disposed, tapered, circumferentially spaced attachment bores
said female cylindrical boss of said hydraulic drive unit having a plurality of radially directed, circumferentially spaced, threaded through-bores corresponding in location to said bores of said male cylindrical bores and removably mountable over said male cylindrical portion; and
a plurality of connecting pins, each having an outer threaded portion and an inwardly tapered inner portion, each pin being threadably insertable through said through-bore of said female boss and into a said tapered male body bore such that said female boss and said male portion may be connected at one of a plurality of selected radial angles;
whereby said nut receiving head portion is placed over a seized nut of a fastener such that said cutter splitting edge bisects a flat of said nut, the opposite flat of the nut being located against said nut bearing forward flat; and
whereby said hydraulic unit is actuated, driving said piston rod against said wedge rod, forcing said cutter splitting edge against seized nut and thereby splitting said seized nut for removal from the fastener, the wedge rod forward end acting as a stop against the split nut wall, thereby avoiding damage to the threads of the fastener.