A clamping arrangement for the force-fit connection of an outer component to an inner component including an inner conical ring and an outer conical ring wherein one of the rings has leadthrough bores clamping screws and the other ring has threaded bores for the clamping screws to brace the rings against one another via the conical peripheral surfaces, and against the inner and outer component arrangement. At least one leadthrough bore having an ejector thread for an ejector screw and the diameter of the ejector thread being greater than the diameter of the clamping screw. The arrangement including an ejector ring with an ejector bore for the leadthrough of the ejector screw which can be screwed into the ejector thread and an ejector surface for engaging a clamping screw head that is incompletely screwed into the corresponding threaded bore for the transmission of an ejector force onto the clamping screw.

Handle assemblies for coupling to a shaft are provided. Each assembly includes a handle having an end wall with a fastener passage extending therethrough and a side wall extending from the end wall to an open end. In one embodiment, an adapter assembly includes a nut, a collet having a fastener portion carrying the nut and a compression portion receiving the shaft, and a clamp mounted on the compression portion and tightened around the compression portion to compress the collet to the shaft. A fastener extends through the fastener passage and into the nut. In another embodiment, the handle defines a conical pocket in communication with the fastener passage. An adapter in the pocket includes circumferentially spaced jaws having conical outer surfaces and inner surfaces engaging the shaft and hinged connectors extending circumferentially between adjacent jaws. A fastener extends through the fastener passage and into the shaft.

Methods and apparatus are disclosed for retaining components in a downhole motor in the event of a mechanical separation or failure of one or more components therein. As described, the retention mechanism does not require a threaded connection to components of the mud motor drivetrain. Downhole motor assemblies including the new catch mechanism also include a structural element to engage the catch assembly and the components to which it is attached in the event of a mechanical failure within the mud motor assembly.

A connector (10) has a male part (12) connected to a female part (50), and each has a passageway which is coaxial with the other when the parts (12 and 50) are connected. A collet (24) surrounds the male part (12), is coupled thereto, and has an external screwthread which engages an internal screwthread on the female part (50), whereby relative rotation between those screwthreads in a given sense causes the female part (50) to sealingly engage the male part (12). The collet (24) has a slot (40) extending longitudinally with respect to the axis of the screwthreads to enable it to be splayed. A wedge (34) between the male part (12) and the collet (24) is displaceable longitudinally with respect to the axis of the screwthreads to splay the collet (24) and lock the male and female parts (12 and 50) together in a sealing engagement.

Handle assemblies for coupling to a shaft are provided. Each assembly includes a handle having an end wall with a fastener passage extending therethrough and a side wall extending from the end wall to an open end. In one embodiment, an adapter assembly includes a nut, a collet having a fastener portion carrying the nut and a compression portion receiving the shaft, and a clamp mounted on the compression portion and tightened around the compression portion to compress the collet to the shaft. A fastener extends through the fastener passage and into the nut. In another embodiment, the handle defines a conical pocket in communication with the fastener passage. An adapter in the pocket includes circumferentially spaced jaws having conical outer surfaces and inner surfaces engaging the shaft and hinged connectors extending circumferentially between adjacent jaws. A fastener extends through the fastener passage and into the shaft.

An improved bushing assembly comprising an inner bushing having an outwardly-facing frusto-conical surface, an outwardly-facing threaded surface, and an inwardly-facing cylindrical surface adapted to engage a shaft, an outer bushing having first and second bushing bearing surfaces and an inwardly-facing frusto-conical surface in sliding engagement with the outwardly-facing frusto-conical surface of the inner bushing, a nut having an inwardly-facing threaded surface in mating engagement with the outwardly-facing threaded surface of the inner bushing and first and second nut bearing surfaces radially overlapping the first and second bushing bearing surfaces of the outer bushing, whereby rotation of the nut in first and second rotational directions relative to the inner bushing moves the outer bushing in first and second axially directions to operatively tighten or untighten, respectively, the inner bushing around the shaft.

Handle assemblies for coupling to a shaft are provided. Each assembly includes a handle having an end wall with a fastener passage extending therethrough and a side wall extending from the end wall to an open end. In one embodiment, an adapter assembly includes a nut, a collet having a fastener portion carrying the nut and a compression portion receiving the shaft, and a clamp mounted on the compression portion and tightened around the compression portion to compress the collet to the shaft. A fastener extends through the fastener passage and into the nut. In another embodiment, the handle defines a conical pocket in communication with the fastener passage. An adapter in the pocket includes circumferentially spaced jaws having conical outer surfaces and inner surfaces engaging the shaft and hinged connectors extending circumferentially between adjacent jaws. A fastener extends through the fastener passage and into the shaft.

Embodiments of the present disclosure disclose an expansion connector for connecting square tubes comprising a base and a square column movably connected to the base. The square column is movable relatively to an end of the base. A first expansion piece and a second expansion piece are sleeved on the square column. The first expansion piece has a first insertion groove on a side. The first expansion piece has a first insertion piece on one end. The first insertion piece has a first bending portion which is in contact with the square column. The second expansion piece has a second insertion groove on a side. The second expansion piece has a second insertion piece on one end. The second insertion piece has a second bending portion which is in contact with the square column.

A mounting device connects a rotary shaft to a rotatable machine element. The mounting device includes an inner sleeve for clamping onto the shaft and an outer sleeve for clamping onto the machine element. The inner and outer sleeves have cooperating tapered surfaces for tightening the mounting device. The cooperating tapered surfaces include striations. A nut connected with the inner and outer sleeves is rotatable to drive the inner sleeve relative to the outer sleeve in a first direction to tighten the inner sleeve onto the shaft and the outer sleeve onto the machine element.

A quick-release engagement device for a female threaded member includes a tubular member and an actuating unit. The tubular member includes a contractible portion which has a male threaded segment and an actuated segment, and which is divided into a plurality of contractible sectors by a plurality of slits. The actuating unit is configured to press the actuated segment to permit the contractible sectors to deform synchronously from an expanded state, where the female threaded member is permitted to be in threaded engagement with the male threaded segment, to a contracted state, where the female threaded member is permitted to be quickly sleeved on or removed from the male threaded segment.