The subject of the invention is an assembly and clamping bolt to be employed under tension, having a shank and a head, wherein the head, situated at a first end of the shank, is provided with a clamping tensioning means with a hydraulic cylinder mounted permanently on the bolt, clamping taking place between a rear shoulder device and the hydraulic cylinder, the rear shoulder device being disposed at a second end of the shank.

The present invention relates to a multi jackbolt tensioner and methods of using the same. The present invention alleviates some of the problems associated with presently available multi jackbolt tensioners.

The present invention refers to a device for tensioning a connecting element fastened to a component to be tightened, which comprises an engagement element having an engagement section receiving and holding the connecting element, a support element configured to support the device against the component, and an actuating unit having a fluid chamber for receiving a fluid, wherein the actuating unit is configured to manipulate a volume of the fluid chamber so as to move the engagement element relative to the support element. The device further comprises a vent opening fluid-communicatively connectable to the fluid chamber which is disposed in the region of the engagement section.

The present invention refers to a device for tensioning a connecting element fastened to a component to be tightened. The device comprises an engagement element connectable to the connecting element, and an actuating unit for translating a rotational movement applied to an actuating element into a translational movement of the engagement element relative to the component. Further, the device comprises a gear unit configured to transform an input torque applied to a transmission input element into an output torque applied to the actuating element which absolute value is higher compared to the input torque.

An apparatus including a threaded member having a head, a shaft extending away from the head, threads disposed on at least a portion of the shaft, and a tip opposite the head. The head, tip, shaft, and threads are sized to pass through a hole in a structure such that the threaded member may be inserted into the structure. The apparatus further includes a tool for mounting to the threaded member that extends out of out the hole when the threaded member is located within the structure. The tool includes a connector that mounts to the tip of the threaded member and a flexible member that extends away from the connector and out of the hole when the threaded member is located within the structure.

A screw for use in joining workpieces, for example automotive body parts, is provided that includes a head portion, an externally threaded shank extending from the head portion, a flow-hole-forming tip disposed at a distal end portion of the externally threaded shank, and a recessed spring washer disposed under the head portion. The recessed spring washer is configured to apply a clamping load to joined workpieces as they expand and contract.

Various embodiments include an apparatus for servicing a turbomachine, along with a related servicing method. In some cases, the apparatus includes: a system for servicing a turbomachine casing having adjacent segments joined with a set of threaded fasteners, the system including: a threaded fastener tensioning device sized to fit over ends of a threaded fastener in the set of threaded fasteners, the threaded fastener tensioning device including: a retention component for retaining a first end of the threaded fastener; and a tensioner for tensioning or de-tensioning a second end of the threaded fastener; and a mounting system coupled with the threaded fastener tensioning device, the mounting system for retaining the threaded fastener tensioning device proximate the adjacent segments of the turbomachine casing.

The invention relates to a device for preventing spills from inside mining mills, said device maintaining a seal around bolts used to secure mill liners, such that the bolt remains under tension within a range of several millimetres along the length between the head and the nut of the bolt, with the length covered by the elements compressed between the head of the bolt and the device for preventing pulp leaks in mills, exerting pressure on the washer that provides a seal against leaks from inside the mill. The device comprises one or more pairs of Belleville washers which include an annular space into which a sleeve with an inner seal is inserted. Said sleeve includes a flange of larger diameter to allow the action of the bolt on the Belleville washers, said Belleville washers exerting pressure on the washer that provides a seal against leaks from inside the mill. The length of the sleeve is greater than or equal to the total thickness of the Belleville washers at maximum compression, and the flange of the sleeve is only required if the diameter inscribed on the contact surface with the bolt is smaller than the annular diameter of the Belleville washers.

A bolt tensioning assembly includes a bolt having a through-hole extending longitudinally through the bolt. A ram is inserted into the through-hole. A top cap is configured to be attached to a first end portion of the bolt. A load distributing member is configured to engage the ram at a location adjacent a second end portion of the bolt to distribute a force exerted thereon by the ram, and an actuator is connected to the top cap to exert a force on the ram to cause the ram to engage the load distributing member such that the bolt is placed under tensile stress.

A method for preloading a bearing includes releasably, threadably, and directly attaching an attaching member to a circumferential outside surface of an exposed end of a threaded shaft of an axle or spindle. A frame is axially separated from, and coupled to, the attaching member. A plurality of extensions extends from the frame axially past the attaching member toward the wheel hub assembly. An adjustment mechanism moves the frame and the plurality of extensions axially towards the wheel hub assembly to contact the wheel hub assembly and/or the bearing to apply a preload to the bearing within the wheel hub assembly.