33results about How to "Reduce working length" patented technology

The present invention discloses a tool assembly being capable of reducing considerably an axial length of a working member (tool), in particular, a length of a male spigot to be coupled with a coupling member and transmitting a torque to a working member without generating a loss by means of a secure coupling between a male spigot of a working member (tool) having a short length and a coupling member. A tool assembly according to the present invention comprises a tool including a head to be approached to a work-piece, a male spigot extended from a rear end of the head and a flange formed at a border portion between the head and the male spigot and having a ring shaped flat rear surface; and a coupling member consisting of a first section having a cavity formed on a central portion of a front side thereof for receiving the male spigot and a second section formed at a rear side of the first section and connected to a driving means. The male spigot has a tapered surface formed on a side thereof, a through hole communicated with the cavity is formed on a side of the first section of the coupling member, and an end of a coupling screw coupled with the through holes is capable of pressurizing the tapered surface of the male spigot received in the cavity.

The invention relates to a pre-tensioning method plate-beam track movable type steel transverse beam integer tensioning device and a tensioning technology. The pre-tensioning method plate-beam rail movable type steel transverse beam integer tensioning device comprises a tensioning end fixing steel transverse beam, an anchoring end fixing steel transverse beam, steel strands, beam restraining table bases arranged between the tensioning end fix fixing steel transverse beam and the anchoring end fixing steel transverse beam, a force transmission column arranged on one side of each beam restraining table base, a track movable type platform arranged on one side of the tensioning end fix fixing steel transverse beam and up-and down adjusting steel plates, wherein the up-and-down steel plates are connected on the tensioning end fixing steel transverse beam, the anchoring end fixing steel transverse beam and a lifting jack moving transverse beam in a buckling mode, and each steel strand is provided with two dual-connecting elements, a single connecting element and three sections of precision rolling twisted steel bars. The pre-tensioning method plate-beam track movable type steel transverse beam integer tensioning device is further provided with a pre-tensioning plate lifting device. The pre-tensioning method plate-beam track movable type steel transverse beam integer tensioning device can conduct construction on multiple beams simultaneously, saves materials, is safe, reliable, capable of being used in multiple times, suitable for construction of all bridge types, simple in operation, continuous in construction and suitable for construction of all beam-plate types, and improves effects. The pre-tensioning plate lifting device is capable of rotating at 360 degrees, storage of movable beams is convenient, occupation of a crane is reduced, and efficiency is improved.

The invention discloses an expansion and contraction joint for a bridge. The expansion and contraction joint comprises a force transfer device, a hydraulic cylinder and a connecting device, wherein the connecting device is positioned on the hydraulic cylinder, the force transfer device is positioned on the connecting device and adopts a force transfer block body (1), the cross section shape of the force transfer block body (1) is a reverse right-angle trapezoidal shape, the force transfer block body (1) is of a hexahedron structure, and comprises a located plane of a right-angle waist, a located plane of an inclined edge, an upper bottom surface, a lower bottom surface, a front surface and a back surface, the located plane of the inclined edge is a work surface, the connecting device adopts a pad block (2), the hydraulic cylinder comprises a hydraulic container (3) and a piston (4), the hydraulic container (3) is a container with an opening at the upper part, the piston (4) is arranged at the opening part of the hydraulic container (3), and the inside of a cavity defined by the hydraulic container (3) and the piston (4) is filled with pressure bearing liquid. The expansion and contraction joint has the advantages that the manufacturing is simple and convenient, the structure is firm and reliable, and the safety is high.

The invention discloses a non-multiplying-power straight pull type hoist which comprises a winch-type hoist body arranged on an engine base, the winch-type hoist body comprises a winding drum driven by a motor through a speed reducer, steering pulley devices are symmetrically arranged at the left side and the right side of the engine base, each steering pulley device comprises a fixed pulley and a pulley holder, the pulley holder is movably connected with a civil engineering foundation, two ends of the winding drum are respectively and fixedly connected with a steel wire rope, the two steel wire ropes are wound on the winding drum towards opposite directions, one steel wire rope is wound out while the other steel wire rope is wound in, the steel wire rope which is wound in is occupied in a rope slot reserved when the other steel wire rope is wound out; and the other ends of the two steel wire ropes are respectively wound through the corresponding fixed pulleys and connected with a rotating gate. The non-multiplying-power straight pull type hoist disclosed by the invention has the advantages of compact structure, small occupied space, and simple and clear control method of the rotating gate.

The invention relates to a low-heat expansion quartz gauge rod as well as a demarcating method and application thereof. The low-heat expansion quartz gauge rod is characterized by being in a the structural form of taking a low-heat expansion coefficient quartz rod as a main body; two ends of the quartz rod are sleeved with metal sleeves; the end surfaces of the metal sleeves arranged on the two ends are respectively provided with cone sockets; the cone angles and the depths of the cone sockets arranged on the two end surfaces are same; and centre lines of the cone sockets arranged on the two ends are overlapped. The invention is very little influenced by temperature, only needs a small number of survey stations when in use, effectively reduces the influence of measurement temperature errors, machining precision and data fitting errors on the working lengths of gauge blocks and is especially suitable for demarcating parameters of an articulated type coordinate measuring machine.

A screw time ascending type elevator comprises a rail rack, a sliding seat unit arranged on the rail rack in a sliding manner, a transmission screw set, a driving screw set, a driven screw set, a driving unit, a transmission unit and a load sliding seat. The transmission screw set comprises a transmission nut part fixedly arranged on the sliding seat unit and a transmission screw in screwed jointwith the transmission nut part. The driving unit is used for driving the transmission screw to rotate. The driving screw set comprises a driving nut part fixedly arranged on the rail rack and a driving screw in screwed joint with the driving nut part. The driven screw set comprises a driven screw. The transmission screw, the driving screw and the driven screw are all rotationally connected with the sliding seat unit. The transmission unit is used for enabling the driving screw and the driven screw to rotate at the same time. The load sliding seat is arranged on the rail rack and connected withthe driven screw.

The invention relates to indoor ventilation equipment, in particular to indoor ventilation equipment capable of controlling ventilation quantity. The indoor ventilation equipment comprises an air duct, an inner channel of the air duct is circular, a plurality of inlets are formed below the air duct, baffles are arranged on the inlets, bottom covers are arranged in the inlets, straight rods are arranged above the bottom covers, electric push rods are arranged above the straight rods, the electric push rods are fixed in the air duct, movable shafts of the electric push rods are fixedly connected with the straight rods, through holes are formed in round balls, and rotating shafts are arranged on the upper portions and the lower portions of the round balls; and the multiple balls are located behind the multiple inlets, and transmission structures are connected with the rotating shafts and the bottom covers and used for driving the multiple balls to rotate. According to the indoor ventilation equipment, the opening states of the multiple inlets are controlled through the arranged electric push rods, specifically, the multiple inlets are sequentially opened along with the increase of the rotating speed of a fan, and the inlets in different positions have different effective ventilation ranges, so that the indoor ventilation efficiency is improved on the whole, and meanwhile, the problem that the ventilation effect is poor due to the fact that a ventilation pipeline is too long is solved.

The invention relates to a trocar sleeve and a method for using the inner and outer tubes thereof, which are mainly suitable for the operation of the abdominal cavity and thoracic cavity of a human body. The casing assembly of the present invention includes a casing lower cover, a sealed cabin and a casing upper cover, and is characterized in that: a locking seat, a locking clip, and circular inner and outer pipes are also provided, and the inner and outer pipes are movably connected , the lock card seat is fixed with the inner tube, and the lock card is fixed on the lock card seat; the outer tube is provided with an outer tube boss, which can move up and down in the chute of the inner tube, and make the lock card extend or retract Advance; the lock card is an elastic part that expands outwards, and is made of memory alloy wire; the inner and outer tube usage method of the present invention is realized by rotating the outer tube so that the lock card is expanded outwards and fixed on the inner cavity wall of the human body. The structure design of the present invention is more reasonable, the casing will not fall off during use, and the use is safer and more reliable.

The invention discloses a lifting starting and stopping system for rotating a gate, which comprises a drive mechanism for driving a cylindrical gate to forwardly and reversely rotate; the drive mechanism is two lifting starting and stopping machines which are arranged at both shores of a river channel symmetrical to the cylindrical gate; two ends of a winding cylinder of each lifting starting andstopping machine are respectively fixed with a steel wire rope and is reversely wound on the winding cylinder, and the other ends of the two steel wire ropes are respectively connected with the upperpart of the cylindrical gate by a plurality of guide slide wheels; a plurality of pulley wheel seats of the guide slide wheels are top / down adjustable structures; and motors of the two lifting starting and stopping machines are in driving connection with the winding cylinder by a speed reducer. The lifting starting and stopping system has the advantages of being simple and compact in structure, and low in manufacture cost, so that the requirement of a urban ecological water system is met, and the aims of flood drainage and flood protection are achieved.

Wave-guide laser working medium with certain width is divided into three pieces along longitudinal direction. Then, after roughing side face of the divided pieces, they are assembled. The said wave-guide laser working medium is composed of Nd:YAG wve-guide working medium and bound edge at two surfaces. Nd:YAG wave-guide working medium is YAG crystal with Nd in ion concentration 1.1% being adulterated. Bound edge is YAG crystal without Nd being adulterated. The invention restrains parasitic oscillation effectively and outputs double laser output power.