69results about How to "Quick tension" patented technology

A method and apparatus for tensioning a staggered anchorage comprised of a plurality of tension members, which are anchored in a bore hole at various depths, thus having different free steel lengths. For each staggered anchorage, each tension member is tensioned up to a predetermined maximal load and is then subsequently adjusted to the working load. To achieve a consistent elongation reserve of the individual tension member and thus to increase the security of a staggered anchorage, the staggered anchorage is adjusted to the working load, all tension members are adjusted to a reduced elongation (ΔIw) by a uniform elongation difference (ΔImax−ΔIw) relative to the respective elongation (ΔImax) of the predetermined maximal load. An arrangement for performing the method has a single tensioning plane, which is force interconnected with defined locking elements that are arranged on tension members in clamping planes.

A tie-down and tensioning device including: a device body; an attachment member connected to the device body, the attachment member including an attachment opening; a cord block comprising a cord block hook connected to the device body, and a cord support surface disposed between the cord block hook and the device body; and a cord gripper attached to the device body, the cord gripper comprising a cord gripper hook connected to the device body, the interior surface of the cord gripper hook and the surface of the device body opposing the interior surface of the cord gripper hook defining a wedge-shaped opening, and a cord gripping surface formed on one of the interior surface of the cord gripper hook and the opposing surface of the device body.

The invention discloses a band-sawing machine for carpenters. The band-sawing machine comprises a machine frame, an upper shield, a lower shield, a workbench, an upper saw clamp, a lower saw clamp, an upper wheel and a lower wheel. The upper wheel is arranged in the upper shield, the upper wheel is arranged on a shaft, and the shaft is arranged on a fixing frame. The upper end of the fixing frame is connected with a connecting frame, and the lower end of the fixing frame is connected with an adjusting plate. The connecting frame is fixed to a panel of the upper shield through a bolt. A deviation adjusting nut is arranged at the lower portion of the panel of the upper shield, the deviation adjusting nut is connected with an adjusting pin, and the adjusting pin penetrates through the panel of the upper shield to be in contact with the adjusting plate. An adjusting handle is arranged on the panel of the upper shield, and the adjusting handle is connected with the fixing frame. By the adoption of a novel saw clamping structure, the band-sawing machine for carpenters has better and more stable guiding performance. An air spring is adopted for assisting the workbench in adjusting the inclined degree, and an automatically adjusting function is achieved. An efficient, fast, and convenient adjusting and tension device is adopted to conduct fast adjusting and tensioning on a saw wheel, the use requirement is met, and economic efficiency is improved.

A quick-release device of a bicycle brake cable includes a brake arm mounted on a frame of the bicycle, a guider selectively slidably mounted on a free end of the brake arm and a safe lever pivotally mounted in the brake arm. The brake arm includes a groove defined along an axis thereof. The guider is hollow to allow the brake cable extending therethrough. The safe lever includes a pivot point that divides the safe lever into a press portion and a stop portion extending toward the guider to prevent the guider from an accidental operation due to an improper force.

A method and apparatus for tensioning a staggered anchorage comprised of a plurality of tension members, which are anchored in a bore hole at various depths, thus having different free steel lengths. For each staggered anchorage, each tension member is tensioned up to a predetermined maximal load and is then subsequently adjusted to the working load. To achieve a consistent elongation reserve of the individual tension member and thus to increase the security of a staggered anchorage, the staggered anchorage is adjusted to the working load, all tension members are adjusted to a reduced elongation (ΔIw) by a uniform elongation difference (ΔImax−ΔIw) relative to the respective elongation (ΔImax) of the predetermined maximal load. An arrangement for performing the method has a single tensioning plane, which is force interconnected with defined locking elements that are arranged on tension members in clamping planes.

The invention provides a device for adjusting plant spacing of a potato seeder, which is characterized in that a driving shaft and a driven shaft are supported on a support, a driving sprocket wheel is arranged on an stretching end of the driving shaft through the support, a driven sprocket wheel is arranged on an stretching end of the driven shaft through the support, one end of a revolving shaft arranged with an adjusting wheel is fixed on the support, two pins arranged with tensioner sprockets are fixed on a transverse plane of the adjusting wheel, a same chain is hanged on the driving sprocket wheel, the driven sprocket wheel and two tensioner sprockets, the chain is hanged on the tensioner sprocket close to a center line of the driving sprocket wheel and the driven sprocket wheel and close to one side of the center line of the driving sprocket wheel and the driven sprocket wheel, and far from the tensioner sprocket of the center line of the driving sprocket wheel and the driven sprocket wheel, and far from one side of the center line of the driving sprocket wheel and the driven sprocket wheel, one end of a spring is hanged on a hook of the adjusting wheel, and the other end is hanged on an end which is clamped on a pair of arc hooks of a circle chain. The device has the advantages of convenient adjustment of plant spacing and wide application scope.

The invention discloses a pre-tightening and force-limiting anti-attenuation mechanism of a pre-tightening and force-limiting safety belt. The pre-tightening and force-limiting anti-attenuation mechanism comprises a mounting disc, a ratchet wheel which is rotatably arranged in the mounting disc, a pre-tightening wheel which is rotatably arranged in the mounting disc and is connected with the bottom end of the ratchet wheel to form a whole body, and an instantaneous transmission mechanism which is communicated with the circumferential direction of the mounting disc and is used for transmittinga driving force to the pre-tightening wheel when the safety belt needs to be tightened, wherein the ratchet wheel is connected with a winding shaft for winding the safety belt. Therefore, the pre-tightening wheel is connected with the ratchet wheel to form the whole body; when the instantaneous transmission mechanism transmits the driving force to the pre-tightening wheel, the pre-tightening wheelcan drive the ratchet wheel to rotate synchronously, and the ratchet wheel is connected with the winding shaft, so that the winding shaft is driven to rotate synchronously, and furthermore, the safety belt is rapidly wound; the safety belt is rapidly tensioned and a passenger in a vehicle is fastened on a seat. The invention further discloses the pre-tightening and force-limiting safety belt andthe pre-tightening and force-limiting safety belt has the beneficial effects above.

According to some embodiments, a winch tightening apparatus comprises a mounting plate; a first moment arm coupled to the mounting plate and configured to provide leverage for rotating the mounting plate; and a pawl comprising a first end and a second end. The first end is pivotally coupled to the mounting plate such that the second end pivots to engage a ratchet gear when the mounting plate is rotated in a first direction and pivots to disengage the ratchet gear when the mounting plate is rotated in a second direction opposite the first direction. Some embodiments include a second moment arm coupled to the mounting plate and configured to provide leverage for rotating the mounting plate. Some embodiments include a counterweight coupled to the mounting plate and positioned to rotate the mounting plate in the second direction.

A quick-release device of a bicycle brake cable includes a main frame mounted to a handlebar of the bicycle, a lever pivotally mounted to the main frame and a push device mounted in the main frame to normally push the lever for selective changing the position between the lever and the push device and the tension of the brake cable.

The invention discloses a quick tensioning mechanism for a woodworking band saw machine and the woodworking band saw machine. The quick tensioning mechanism comprises a tensioning frame, a tensioning assembly, a cam assembly, a guiding element and an upper wheel shaft assembly, and the tensioning frame is fixed to a machine body of the woodworking band saw machine; the tensioning assembly penetrates the tensioning frame and can perform lifting movement relative to the tensioning frame; the cam assembly is connected with the tensioning assembly; when the cam assembly is driven, the tensioning assembly can be lifted and released; the guiding element is connected with the tensioning assembly, so that the guiding element and the tensioning assembly can synchronously move; the guiding element is connected with the tensioning frame at the same time, so that the guiding element and the tensioning frame can perform lifting movement; the upper wheel shaft assembly is connected with the guiding element, so that the upper wheel shaft assembly can swing around the axis of the guiding element; and the upper wheel shaft assembly is connected with an upper saw wheel of the woodworking band saw machine, so that when the upper wheel shaft assembly is driven, the upper saw wheel can be driven to synchronously move. The quick tensioning mechanism has the beneficial effects that the quick tensioning mechanism is applicable to operation of the small band saw machine, the space of the band saw machine is saved, split swinging of the quick tensioning mechanism can be achieved, and the swinging precision is improved.

The invention discloses a rotary cutting beveling machine. The rotary cutting beveling machine includes two automatic feeding copying tool posts, a telescopic transmission device, a telescopic guide track and a pushing rod mechanism, and the telescopic transmission device is installed on the telescopic guide track; the telescopic transmission device includes a sprocket-wheel case and a track trolley chain, the track trolley chain is formed by hinging a plurality of track trolleys end to end, the two automatic feeding copying tool posts are fixed to two of the track trolleys, a cutting tool isinstalled on one of the tool posts, and a beveling tool is installed on the other tool post; and the telescopic guide track includes a guide track body, a locking chain, a spring and a tensioning assembly. The rotary cutting beveling machine can meet the cutting beveling of all pipes of different diameters, completely realize cold cutting, and is extremely wide in use, all parts are connected by aquick tension mechanism, and disassembly and installation are convenient.

A quick-release device of a bicycle brake cable includes a brake arm mounted on a frame of the bicycle, a guider selectively slidably mounted on a free end of the brake arm and a safe lever pivotally mounted in the brake arm. The brake arm includes a groove defined along an axis thereof. The guider is hollow to allow the brake cable extending therethrough. The safe lever includes a pivot point that divides the safe lever into a press portion and a stop portion extending toward the guider to prevent the guider from an accidental operation due to an improper force.

According to some embodiments, a winch tightening apparatus comprises a mounting plate; it first moment arm coupled to the mounting plate and configured to provide leverage for rotating the mounting plate; and a pawl comprising a first end and a second end. The first end is pivotally coupled to the mounting plate such that the second end pivots to engage a ratchet gear when the mounting plate is rotated in a first direction and pivots to disengage the ratchet gear when the mounting plate is rotated in a second direction opposite the first direction. Some embodiments include a second moment arm coupled to the mounting plate and configured to provide leverage for rotating the mounting plate. Some embodiments include a counterweight coupled to the mounting plate and positioned to rotate the mounting plate in the second direction

Safe transport of bulk materials is assured by a lashing system that suspends a flexible end face panel adjacent to rear doors of a shipping container, and that restrains the end face panel during loading and subsequent transport, so that the adjacent container door may be opened and closed without difficulty. The lashing may for instance be done by threading a strap through a ring in a central part of the panel and several cargo rings in the corners of a door opening of the container, and after tightening the strap, the strap is secured by passing a clasp through two holes in the strap that are aligned when under the desired tension. A triangular shaped strap may be sewn into the panel with a ring at the apex as an embodiment.

A quick-release device of a bicycle brake cable includes a main frame mounted to a handlebar of the bicycle, a lever pivotally mounted to the main frame and a push device mounted in the main frame to normally push the lever for selective changing the position between the lever and the push device and the tension of the brake cable.

A device for producing fiber preforms includes a plurality of unwind stations, a plurality of grippers and at least one first molding tool. Each gripper is movable on a path between a maximum position and a pick-up position. The pick-up position is provided at a thread transfer point and is closer to the unwind station than the maximum position. The first molding tool has a draping position in the region of the connecting lines between the maximum position and the thread transfer points, and a starting position outside the connecting lines. A thread tension control for the threads or rovings is provided.

The invention discloses a string drawing tension device for a racket. The string drawing tension device comprises a base (1), a reinforcing piece (2), a force transfer piece (3) and a connecting piece (4), which are matched with a racket shelf bracket (21), wherein the force transfer piece (3) passes through the base (1), one end of the force transfer piece (3) is connected with the connecting piece (4), and the reinforcing piece (2) is arranged at the other end of the force transfer piece (3). The string drawing tension device has the advantage of simple structure, and is convenient to manufacture and install; and when the string drawing tension device is used, net strings of the racket can be tensioned quickly, so the service life of the net strings is prolonged, and the cost is also saved.