67 results about "Wedge shaped head" patented technology

A sleeper-support device designed to minimize cervical rotation with respect to the torso for a person lying prone. The device includes a wedge-shaped head support that maintains the head in repose at an intermediate orientation between zero rotation and the traditional 90-degree rotation typical of the prone sleeper. The device also includes a wedge-shaped torso piece that constrains the torso from rotating in the direction that would increase the angle between the head and neck (the head-turn angle). The support this device provides prone sleepers allows them to sleep comfortably without incurring the back and cervical stress and strain commonly associated with sleeping in the prone position.

A sleeper-support device designed to minimize cervical rotation with respect to the torso for a person lying prone. The device includes a wedge-shaped head support that maintains the head in repose at an intermediate orientation between zero rotation and the traditional 90-degree rotation typical of the prone sleeper. The device also includes a wedge-shaped torso piece that constrains the torso from rotating in the direction that would increase the angle between the head and neck (the head-turn angle). The support this device provides prone sleepers allows them to sleep comfortably without incurring the back and cervical stress and strain commonly associated with sleeping in the prone position.

A cemented carbide insert, including an upper side, an under side, a plurality of side surfaces extending between the upper side and the underside, and an inset including a cutting edge. The cutting edge includes a nose edge and two main edges converging toward the nose edge. The inset is formed of a material that is harder than the cemented carbide, and is countersunk in the surrounding cemented carbide and co-ground with the surrounding cemented carbide. The inset is arranged in a front, wedge-shaped head delimited by one chip surface and two clearance surfaces running along the main edges. The inset transforms into an adjacent body part via limiting surfaces situated inside imaginary planes in the extension of the chip surface and the clearance surfaces.

The invention discloses a forming delay mechanism for a die. The forming delay mechanism comprises a die loading part, an unloading part and a female die plate, wherein an elastic male die with a wedge-shaped groove formed in the side surface and a vertical rod parallel to the male die are arranged on the die loading part, and the head part of the vertical rod is wedge-shaped; an elastic push rod and an elastic limiting rod are arranged on the unloading part, the elastic push rod is matched with the wedge-shaped groove of the male die and the head part of the vertical rod by the wedge-shaped head part and an inclined plane at the tail part, a groove is formed in the side surface of the push rod, and the elastic limiting rod is matched with the groove of the push rod by the spherical head part and connected with the female die plate. The forming delay mechanism can prolong the forming action time of the male die and play a pressure maintaining role, has a better forming effect, achieves pressure maintaining to move mechanically, and is reliable in operation.

The invention relates to a horizontal taking-off and landing two stage to orbit (TSTO) reuse aerospace plane layout. A first-stage aircraft and a second-stage aircraft are included, and the second-stage aircraft and the first-stage aircraft are in up-down horizontal parallel layout; the second-stage aircraft is in wing body combination body layout with a wedge-shaped head, a fusion edge strip, a small-span-chord-ratio sweepback thin wing and a central vertical fin; and the first-stage aircraft is in wing body combination body layout of a cathedral sweepback wing with the waverider characteristic, a downwards-folding wing tip and a V tail. The horizontal taking-off and landing TSTO reuse aerospace plane layout meets the TSTO flight principle based on the turbine based combined cycle (TBCC),the design demands of the whole speed domain, the whole airspace lift-drag matching, push-resistance matching, operation-stability matching, volume-weight matching and the like are reached, and the closure of the TSTO technical scheme in the conceptual design stage is achieved.

The invention discloses an accumulation mechanism of an accumulation type conveyor. The accumulation mechanism of the accumulation type conveyor is characterized in that a drive motor is fixedly arranged on a rail bed body; the drive motor drives a circulation chain to circulate and move by a transmission chain wheel; tray trolleys are supported by rollers and operate on the rail bed body; a sliding column is arranged on the bottom of each tray trolley; a sliding pair formed by a sliding block is sleeved on each sliding column; a side vertical toothed plate is fixedly arranged on the side part of each sliding block; meshing teeth meshed with the circulation chain are arranged on the bottom edge of each side vertical toothed plate; a rotating wheel is arranged on the outer side of each side vertical toothed plate; a liftable wedge-shaped clamping plate is arranged on the rail bed body and is driven by a drive cylinder; the wedge-shaped head of the wedge-shaped clamping plate faces to the direction opposite to the movement direction of the trolleys, and can be inserted into the bottom of the corresponding rotating wheel to lift the rotating wheel together with the corresponding sliding block and the corresponding side vertical toothed plate, and the rotating wheel, the sliding block and the side vertical toothed plate are separated from the meshing with the circulation chain. The assembly mode is simple, the manufacturing cost is low, and the use is reliable.

A die stamping system includes an upper die, a sliding block, a lower stripper, a die holder connected to the lower stripper, and a lower die-set moveably connected to the die holder. The sliding block includes a body with a wedge-shaped head facing down, a punch connected to the body, and two arms on opposite sides of the body, respectively. The lower stripper matches the upper die-set and has an aperture for passage of the punch therethrough. The die holder is connected to the lower stripper and includes an opening for passage of the body therethrough, and a first notch receiving the two arms. The first notch is larger than the arms. The lower die-set is movably connected to the die holder and includes a wedge-shaped padding block facing up and supporting the wedge-shaped head of the body.

The invention discloses an electrical terminal ground structure and an installation method. The electrical terminal ground structure is characterized in that a bolt is provided with a wedge-shaped head and a threaded section, a shrink-ring is provided with a wedge-shaped face sleeve and a flange, and the wedge-shaped head is sleeved with the sleeve; the external round face of the sleeve is in tight fit with an installation hole of a ground plate in the radial direction; a lock nut and a spacer are installed outside the threaded section; an electrical terminal is axially installed between the flange and the spacer, and an axially screwed nut enables the electrical terminal to make tight contact with the flange of the shrink-ring. The bolt is made of stainless steel, and the shrink-ring is made of aluminum alloy or copper alloy. The installation method comprises the steps that after the surfaces of the bolt and the sleeve are processed, the wedge-shaped head is sleeved with the sleeve, the sleeve is inserted into the installation hole, the bolt is screwed in a riveting device for riveting, and then the bolt is sleeved with the electrical terminal and the nut until axial compression is achieved. The test shows that by the adoption of the structure and size optimization, the properties such as pulling-out force, rotational torque, leakage, a resistance value, impact resistance and vibration resistance can meet the requirements. The existing welding defects are overcome, the connection problem caused when an existing ground plate is made of a composite material is solved, and the electrical terminal ground structure is applied to high-speed trains, railway tracks, buildings and the like and meets the property requirement of ground structures under the complex conditions.

A battering ram system includes an elongated tubular body with an open end and a pair of laterally-extending handles that can be grasped for swinging the body against a door to break a door down. Interchangeable impact heads are provided, each having an elongated male section fit into an open end of the body, a flange abutting the end when the male section is in the body, and an operative end configured to generate a desired impact against the door. A retainer threads into the body to retain the head to the body, but still the flange transfers energy to the body from the impact and not the retainer. The plurality of impact heads are particularly shaped for specific different tasks, such as oversize heads for weight and large surface, undersized heads for high force and damage, and wedge-shaped heads for prying / wedging.

The invention discloses a handle lengthening structure for a hand-operated tool. The structure comprises a handle and a lengthening rod of the hand-operated tool, a spring and a telescopic rod, wherein the rod-shaped handle is inserted into the central hole of the lengthening rod; radial blind holes are distributed on the circumferential surface of the handle at equal angles and consist of a stepped hole on the inner side and a threaded expanded hole on the outer side; the spring is positioned in a small-diameter hole of the stepped hole; the telescopic rod is positioned on the outer side of the spring, and the outer end of the telescopic rod is extended out of the threaded expanded hole; the bottom of the telescopic rod is connected with a large-diameter hole molded surface of the stepped hole; a limiting bolt sleeved on the telescopic rod is connected in the threaded expanded hole; the telescopic rod is provided with a wedge-shaped head part; the end face of the wedge-shaped head part is a curved surface, and is in linear contact with the wall of the central hole; and a contact line is deviated from the central line of the telescopic rod. In the structure, the space between the lengthening rod and the handle can remain at any position so as to fulfill the aim that the lengthened length of the handle can be arbitrarily changed.

The invention provides a rolling method for expanding the capacity of a coiling machine and eliminating impressions of the heads of coiled materials. Plate strips are rolled by a plurality of machine frames through the rolling method. The rolling method is characterized by comprising the steps of 101, determining the thickness specification and the thickness adjusting amount of the plate strips needing to be rolled with the variable specification, 102, determining the rolling reduction of a first machine frame during rolling, 103, checking rolling force of the first machine frame, 104, calculating the length of the heads of the plate strips needing to the rolled with the variable thickness of each machine frame, 105, determining the roller gap adjusting amount of each machine frame, and adjusting a roller gap of each machine frame. According to the rolling method, a user can conveniently roll the plate strips of the four machine frames, and the plate strips sequentially pass through the first machine frame, the second machine frame, the third machine frame and the fourth machine frame and form the wedge-shaped heads, so that the maximum allowed coiling thickness of the coiling machine and an assisting coiling device is improved, and the capacity of the coiling machine is expanded; the impressions caused by the excessively-thickened strip heads in the middles of the coiled materials are eliminated, the yield of the coiled materials is improved, the material yield is improved, and losses are reduced.

The invention discloses an expansion bolt which comprises a bolt main body and an expansion sleeve, wherein the bolt main body comprises a hexagon head and a screw rod; a threaded part is arranged on the middle part of the screw rod; a wedge-shaped head part is arranged at the outer end of the screw rod; a gasket is sleeved on the screw rod; an inner threaded hole which is matched with the threaded part is formed in the expansion sleeve; one end of the expansion sleeve penetrates through the wedge-shaped head part and then is sleeved on the threaded part; a plurality of opening expansion gaps are formed in the end face at the other end of the expansion sleeve; and a plurality of bar-shaped flanges are bulged on an outer side wall of the expansion sleeve at intervals. According to the invention, in a mounting process, after the hexagon head is tightened, the wedge-shaped head part of the screw rod is jacked toward the interior of the expansion sleeve, the expansion sleeve is expanded due to the existence of the expansion gaps, meanwhile, the wall is more tightly clamped by the bar-shaped flanges on the outer side wall of the expansion sleeve, and the expansion bolt can be reliably fixed and can not become loosened; and in a dismounting process, the whole bolt main body is screwed out, and only the expansion sleeve is left in the wall, so that the whole expansion sleeve can not be exposed on the ground or the exterior of the wall and no potential safety hazard is caused.

The invention relates to a ball valve type core sediment collector. A grip is T-shaped, the lower end of the grip is connected with an external casing and a sampling pipe, and the external casing is coaxial with the sampling pipe and sleeved outside the sampling pipe which is a circular pipe and has the cross section smaller than that of the external casing; the external casing has the same length as the sampling pipe, the other end of the external casing is connected with a wedge-shaped head which is hollow and communicated with the sampling pipe, the outer edge of the wedge-shaped head corresponds to the external casing, and the other end of the wedge-shaped head is saw-toothed; the wedge-shaped head is conically connected to the ends of the external casing and the sampling pipe, larger than the other saw-toothed end of the wedge-shaped head; the upper part of the sampling pipe, near the grip, is provided with a driving chain wheel, the axis of the driving chain wheel is superposed with the diameter of the sampling pipe, the lower part of the sampling pipe, near the wedge-shaped head, is provided with a ball valve, and a rotary shaft of the ball valve is parallel to the axis of the driving chain wheel and provided with a driven chain wheel; and the rotary shaft of the driving chain wheel is fixedly connected with a rotary handle, and the other end of the rotary handle penetrates through the external casing and the grip. The ball valve type core sediment collector is durable, convenient to operate on the sea, low in manufacture cost as well as high in visibility and practicality.

The invention discloses a rope pressing device of an endless rope continuous-traction system. The rope pressing device comprises a pair of rope pressing wheels. Each one of the rope pressing wheels is provided with an opening / closing mechanism, and the opening / closing mechanism comprises a cylinder body, a piston, a piston compression spring, two side frames, two translational blocks respectively with two wedge-shaped heads, an upper-frame, a lifting block between the two wedge-shaped heads of the two translational blocks, a pair of translational guide rods, and a pair of lifting guide rods; opposite surfaces of the two translational blocks are respectively provided with locating pins; the locating pins pass through pin holes of the cylinder body and are located at the back of the piston; the two translational guide rods are fixedly connected respectively to the corresponding parts of the cylinder body; translational springs are arranged between the side frames and the translational blocks; the two lifting guide rods respectively pass through the upper-frame and are fixedly connected to the lifting block; lifting compression springs are arranged between the lifting block and the cylinder body; an idler wheel base is fixed between upper parts of the two lifting guide rods; and an idler wheel is hinged to the idler wheel base. Two supports are fixed respectively to heads of two piston rods. The two rope pressing wheels are fixed respectively to the two supports. The rope pressing device can be used under complex conditions and has good rope pressing effects.

The invention relates to an apparatus used for soil sampling and moisture measuring in drip irrigation tests. The apparatus comprises a positioning device, a sampling scale plate, a pushing device and a sampling drilling pipe; the pushing device comprises a threaded support rod; the bottom of the threaded support rod and a connecting rod are connected via a pushing device fixing hole; the top part of the threaded support rod is provided with a rocking handle; the threaded support rod is provided with a spring; the spring is arranged below a movable scale plate; the sampling drilling pipe is a hollow circular pipe provided with a side seam; the top part of the hollow circular pipe is provided with a hollow circular pipe threaded mouth; the end part of the hollow circular pipe is provided with a wedge-shaped head; and the circle center of an outer ring, the circle center of an inner ring, the center of the pushing device fixing hole, and the center of a pushing device installing hole are on a same line. The apparatus is capable of avoiding time consumption and labor consumption of sampling using existing single soil drills, and influences on test results, reducing test cost, and increasing test precision and work efficiency as far as possible.

The invention discloses a one-way air intake component, which comprises a straight tube-shaped elastic body, the elastic body has a blind hole, at least one hole is opened on the side wall or bottom of the blind hole, and can be operated under the action of suction or pressure. The opening or closing of the air inlet slot; there is a wedge-shaped head protruding downward at the bottom of the blind hole and communicating with the blind hole, and the tip of the wedge-shaped head has one or two inlets communicating with the blind hole. gasp. Install the one-way air intake member on the container. When the air in the container is sucked away, there will be an air pressure difference between the outside of the container and the inside of the container, and the scribing track of the one-way air intake component will automatically open until the air pressure values ​​outside the container and inside the container are balanced, and the slit of the one-way air intake will The channel will be closed automatically; the function of continuous smoking can be realized.

The invention provides a mechanical equipment disassembling tool capable of keeping a disassembled part to be in a clamped state. The mechanical equipment disassembling tool is characterized by being provided with a screwdriver and a pair of open mouth tongs, wherein the screwdriver is provided with a handle and a rotating rod body; the tail of the rotating rod body is provided with a thin wedge-shaped head; the rotating rod body of the screwdriver is provided with a clamping groove; the pair of open mouth tongs is provided with two crossed handles; the handles are provided with tong heads; the tail ends of the tong heads are provided with relative extension structures; the two handles are movably connected by virtue of a connecting shaft; the handles are provided with round open holes; the rotating rod body passes through the round open holes; the inner-diameter peripheries of the round open holes are provided with clamping mechanisms which are matched with the clamping grooves; one end, which is away from the corresponding tong head, of each handle is provided with a limiting device; each limiting device specifically comprises a limiting bulge and a plurality of levels of limiting grooves. By virtue of the arrangement, in a process of screwing down or unscrewing mini components such as the disassembled bolts and nuts or gaskets and washers, the mini components are kept in a clamped state and can not fall into mechanical equipment, so that potential safety hazards are reduced.

The invention discloses an assembly type finish hanging plate system component. The assembly type finish hanging plate system component comprises a fastening part, a gasket, a nut, a nut with a handleand a screw cap for hanging, wherein the fastening part comprises an expanding tube, a screw and a wedge-shaped head; a plurality of axial cutting seams are formed in the outer side surface of the front part of the expanding tube; one end of a bolt is inserted into the expanding tube, and the end is bulged to the front end of the wedge-shaped head; the wedge-shaped head sleeves the bulged part ofthe bolt; the gasket sleeves the screw; one end surface of the gasket abuts against one end, back to the wedge-shaped head, of the expanding tube; the nut sleeves the screw; one end of the nut abutsagainst one end, back to the expanding tube, of the gasket; the nut with the handle sleeves the screw; the nut with the handle is positioned at the rear side of the screw; and the screw cap for hanging is arranged at the rear end of the screw. A fixed plate is fixedly arranged on a board, and the fixed plate is hung on the inverted-H-shaped screw cap, so that the board is fixed onto a wall body.

The invention relates to a piston connecting rod structure of an internal-combustion engine. A piston is hinged with a connecting rod small end through a piston pin. The piston connecting rod structure is characterized in that the left and right symmetrical sides of the connecting rod small end are provided with inclined planes so that the connecting rod small end forms a wedge-shaped head; the center of the inclined plane at the symmetrical side of the wedge-shaped head is provided with a through hole for assembling the piston pin; the part of the piston for assembling a connecting rod is provided with a wedge-shaped groove; and a pin hole formed on a piston pin seat of the piston passes through the wedge-shaped groove. The connecting rod small end adopts a wedge-shaped structure, so a reciprocating inertia force of the connecting rod is reduced by subtracting the residual mass of the connecting rod, and meanwhile the strength and rigidity of the piston connecting rod can be satisfied.

The invention discloses a jaw vice anchorage anchor device used for single-hole steel strand fatigue test. The jaw vice anchorage anchor device comprises an oil cylinder; a fixed disc and a pressing disc are fixedly arranged on the upper part of a piston rod of the oil cylinder successively; the pressing disc is provided with a center circular hole used for accommodating steel strands and at least two installation holes used for accommodating vertical guide rods; the lower part of the pressing disc is provided with a radial opening groove; the installation holes are communicated with the radial opening groove; a vertical spring is arranged between each vertical guide rod and the fixed disc; each vertical guide rod and the corresponding spring are slidingly connected with an integral groove formed by the radial opening groove and a corresponding installation hole; a wedge-shaped head of each vertical guide rod is inserted into a gap of sub-jaws; a radial rod fixedly connected with the vertical guide rods is arranged in the radial opening groove, and is stretches out from the pressing disc; a cylinder body of the oil cylinder is fixedly arranged on a counterforce frame; the counterforce frame is provided with a pressing plate and limiting bolts; the lower end of the pressing plate is pressed against the upper end of an anchor ring; the pressing plate is penetrated by one end of a steel strand with a jaw vice anchorage, and the other end of the steel strand is arranged to be right above the center circular hole; and the limiting bolts are arranged right above one rod end of the radical rod stretched out from the pressing disc. The jaw vice anchorage anchor device is capable of realizing automatic anchoring of a jaw vice anchorage on single-hole steel strands.

The invention discloses an LED (Light Emitting Diode) illuminating device for plant pot culture, which is characterized by comprising an insert part and an illuminating part, wherein the insert part is inserted into the soil for the plant pot culture so as to support the whole body; the illuminating part is formed on the head part of the insert part and is used for illuminating the roots of the plant; the insert part comprises an insert nail, a main body rod and a close switch; the insert nail is provided with a wedge-shaped head and is inserted into the soil; the main body rod is arranged in the top of the insert nail and is provided with an opening battery chamber; the close switch is used for closing the opening battery chamber of the main body rod and is provided with a control switch; the illuminating part comprises an energy-saving LED illuminator for illuminating, and a sealing casing pipe; and the sealing casing pipe is used for packaging the LED illuminator and is provided with a light-transmitting window. The LED illuminating device for the plant pot culture has the beneficial effects: the structure is simple and practical, the rootstocks of the pot plant and the soil can be effectively illuminated according to the smart design, and the observation becomes more convenient.

The invention discloses a semicircular pile plate which comprises wing plates, concave semicircles, convex semicircles, web plates and a pile head. The semicircular pile plate is characterized in that the left sides of an A plate and a B plate are respectively provided with a concave semicircle, the right sides of the A and B plates are respectively provided with a convex semicircle, the convex semicircle of the A plate is just inserted into the concave semicircle of the B plate, and the convex semicircle of the B plate is just inserted into the concave semicircle of the A plate. The A and B vibration plates are both steel plates made of structural steel and respectively provided with a reinforced wing plate; and the pile head is a wedge-shaped head and can be hammered into the ground well.

The invention discloses a wedge-shaped plug L-shaped pile forming machine. During a downward feeding process, an L-shaped hole with a concave wedge-shaped head at the left end and a convex wedge-shaped head at the right end is formed in a main rod, concrete casting is performed in the L-shaped hole, namely an L-shaped pile with the concave wedge-shaped head at the left end and the convex wedge-shaped head at the right end is formed, a second L-shaped concrete plug pile is manufactured in the left side of the L-shaped plug pile at an interval of one L-shaped plug pile distance, and in the way, a plurality of L-shaped concrete plug piles at intervals of one L-shaped plug pile distance are manufactured; when the concrete strength of the L-shaped concrete plug piles on two sides reach a certain value, an L-shaped hole is made in a space between every two L-shaped plug piles, concrete casting is performed in the L-shaped holes so as to form L-shaped plug piles, therefore, a plurality of L-shaped concrete plug piles with mutual wedged plugs are formed, and are used for soil blocking and leakage preventing for a building foundation.

The invention relates to a convenient sanitary chalk cover which comprises a chalk cover body, a chalk clamp for clamping a chalk, a sliding assembly for placing the chalk into the chalk cover body, and a laser assembly. The chalk cover body is in a cylindrical shape; an opening is formed in the head part of the chalk cover body; the laser assembly is arranged at the tail part of the chalk cover body; the chalk clamp is located in the chalk cover body and comprises a fixing sleeve for fixing the chalk, a clamping iron sheet, a clamping iron sheet fixing seat and a chalk clamp switch; the clamping iron sheet fixing seat is fixed onto an annular connecting piece; the chalk clamp switch is pressed down, a wedge-shaped head opens an opening of the fixing sleeve, and one end of the chalk is clamped into the fixing sleeve from the head part of the chalk sleeve body; through backwards sliding a sliding piece, a lug of the sliding piece enables the back end of the clamping iron sheet to be separated from sawteeth, and then the clamping iron sheet fixing seat and the fixing sleeve are driven to move backwards, so that the chalk is loaded into the chalk sleeve body. According to the convenient sanitary chalk cover provided by the invention, the chalk can be placed into the chalk sleeve and is then used.

The invention discloses a steel feeding platform of a steel-pushing-type heating furnace. The steel feeding platform of the steel-pushing-type heating furnace comprises sliding platforms, sliding platform connecting plates I and sliding platform connecting plates II. The steel feeding platform of the steel-pushing-type heating furnace is characterized in that the left ends of the sliding platforms, the sliding platform connecting plates I and the sliding platform connecting plates II are chamfered to form wedge-shaped heads, and the right ends of the sliding platforms, the sliding platform connecting plates I and the sliding platform connecting plates II are designed to form wedge-shaped grooves matched with the wedge-shaped heads; the slide platforms are connected with one another sequentially by the sliding platform connecting plates I and the sliding platform connecting plates II; the components are connected end to end by the match of the wedge-shaped heads and the wedge-shaped grooves and press against one other so as to form the steel feeding platform of the heating furnace. According to the steel feeding platform, the sliding platforms and the sliding platform connecting plates are connected in a pressing manner by the match of the wedge-shaped heads and the wedge-shaped grooves; an original sliding platform connecting plate is disassembled into two blocks with the length being half of the length of the original connecting plate, and meanwhile, the thickness is increased, so that the sliding platform connecting plates are free of deformation and arching because of high temperature, steel blanks can enter the furnace smoothly along the steel feeding platform, and the phenomenon of knocking the sliding platforms or the sliding platform connecting plates cannot be generated.

A hand-operated pulley for a substation comprises a pulley support. A supporting shaft is fixed in the middle of the pulley support, a pulley wheel is installed on the supporting shaft, a crank is installed on the pulley wheel, a safety hook head is installed at the lower end of the pulley support, the pulley wheel is provided with a through hole, two straight rods are arranged in the through hole, two ends of every straight rod are positioned on the outer portion of the through hole, the lower ends of the straight rods are provided with wedge-shaped heads, tips of the wedge-shaped heads are downwards, wedge blocks are arranged on the upper portions of the straight rods, tips of the wedge blocks are upwards, the upper portions of the two straight rods are connected with a cylinder block, the bottom of the cylinder block is provided with a blind hole, the straight rods are inserted in the blind hole, a hole wall of the blind hole is provided with a wedge block hole, the wedge blocks penetrate through the wedge block hole, the top of the cylinder block is connected with a pull rope, and a spring piece is arranged between the two straight rods. The pull rope is fixedly connected with the pulley wheel, slippage of the pull rope and the pulley wheel is avoided, a device lifts stably, the pull rope is stressed evenly, and safety in pull rope use is guaranteed; different pull ropes can be replaced conveniently according to the difference of transported devices, the pull rope and the pulley wheel are convenient to dismantle and install, and working efficiency is improved.

A cemented carbide insert, including an upper side, an under side, a plurality of side surfaces extending between the upper side and the underside, and an inset including a cutting edge. The cutting edge includes a nose edge and two main edges converging toward the nose edge. The inset is formed of a material that is harder than the cemented carbide, and is countersunk in the surrounding cemented carbide and co-ground with the surrounding cemented carbide. The inset is arranged in a front, wedge-shaped head delimited by one chip surface and two clearance surfaces running along the main edges. The inset transforms into an adjacent body part via limiting surfaces situated inside imaginary planes in the extension of the chip surface and the clearance surfaces.

The invention discloses an unmanned aerial vehicle with a conveniently replaced battery. The unmanned aerial vehicle comprises a machine body, wherein the middle of the machine body is provided with mounting heads, a mounting is transversely arranged between the mounting heads, the outer side of the mounting plate is connected with a battery box, one end of the battery box is rotationally connected with a battery mounting frame through a hinge, an electrode elastic piece is fixed to one end of the battery mounting frame, a wedge-shaped head is hinged to the other end of the battery mounting frame, the other end of the battery box is provided with a wedge-shaped groove corresponding to the wedge-shaped head, a storage battery is in clamped connection between the wedge-shaped head and the electrode elastic piece, and the ends of the mounting heads is provided with limiting grooves corresponding to fixing heads. The unmanned aerial vehicle with the conveniently replaced battery has the advantages that through the arranged battery mounting frame, the storage battery is placed between the wedge-shaped head and the electrode elastic piece, then the battery mounting frame is rotated to the inner portion of the battery box and in clamped connection and fixed, the cooperation of the wedge-shaped head and the wedge-shaped groove provides convenience for turnover, picking and placing of the battery mounting frame on the battery box, so that the assembly and disassembly of a battery are very convenient, and the operation is simple.

A tool for removing sheathing, decking material and the like includes a generally wedge-shaped head and a handle having a base end portion integrally connected to the head and a free end portion projecting rearwardly from a rear end of the head. A fulcrum member removably connects to the head proximate the rear end thereof so as to extend in a direction transverse to the handle to provide a fulcrum during operation of the tool.