3 results about "Left handed" patented technology

The present invention is directed to a geared chalk line preferably configured for a left-handed user. The geared chalk line may comprise an enclosure, a reel, a string line, a hook, a plurality of gears, and a crank. The geared chalk line may be a tool for striking a straight line across a work surface using chalk. The enclosure may comprise a chalk box and a gear box. The chalk box may house the reel and the chalk. The string line may be deployed from the reel for use. The plurality of gears may be configured for the crank to rewind the string line faster than if ungeared. The plurality of gears be housed in the gear box separate from the chalk such that the chalk does not impede the plurality of gears. The string line may be stretched across the work surface and snapped to deposit the chalk on the work surface.

A kind of annular saw, including shell and circular saw blade being arranged at the end of shell, the driving mechanism being arranged in the shell and capable of driving circular saw blade rotation, the handle being arranged close to the circular saw blade of the shell, the handle includes the mounting portion in the middle and the first handle and the second handle at the two sides of mounting portion, the first handle and the second handle are located at the upper and lower sides of shell respectively, the mounting portion of the handle is fixed on shell and circular saw blade is located at the outside of shell and handle in its axial direction.The handle and the handle structure of the utility model annular saw are innovatively designed, can realize annular saw 180 ° rotation and hold as comfortable as before;It meets the ergonomic innovative design structure, right-handed and left-handed people can use normally, and meet the different working condition requirements that can be pasted to left side wall and also can be pasted to right side wall to groove front wall, adapt to left-handed, right-handed and wiring direction simultaneously, different working conditions are convenient to switch and use.

This utility model discloses a writing friction force detection device with improved accuracy, belonging to the field of detection devices. It includes a detection platform with a detection mechanism on its top surface. The dynamic angle adjustment mechanism uses a third cylinder to drive a rack and pinion gear, which in turn drives a concave frame to rotate around a rotating rod, allowing for arbitrary angle adjustment of the writing platform within the range of 0-90°. This precisely adapts to the personalized writing needs of left-handed users tilting to the left and right-handed users tilting to the right, while also accommodating the 25°-35° tilt angle required for English writing and the 10°-25° tilt angle commonly used for Chinese character writing. This precise angle adjustment capability ensures that the pen tip and paper make contact in a realistic writing state, avoiding uneven force distribution caused by angle deviations. This ensures that the friction and pressure distribution matches actual writing conditions, thereby eliminating detection misjudgments caused by angle mismatches and significantly improving the accuracy of the detection data.