41 results about "Movement quality" patented technology

An exercise machine for performing barbell type free weight lifting exercises has a power cage or Smith press type frame, an elongated bar held on the frame in a substantially horizontal resting position, and an adjustable exercise mass assembly that allows a user to select an exercise weight from among a plurality of choices of different exercise weights provided by the exercise mass assembly. The exercise mass assembly is separate from the bar and any auxiliary weight plates carried on the bar. A cable and pulley system operatively connects the bar to a movable portion of the exercise mass assembly that provides the selected exercise weight. A powered actuator sets up the bar for performing a weight lifting exercise by lifting the movable portion of the exercise mass assembly up above a second portion of the exercise mass assembly that remains stationary during the particular weight lifting exercise.

A hybrid plane lower-mobility virtual axis machine tool belongs to the technical field of mechanical manufacturing. The main structure of the hybrid plane lower-mobility virtual axis machine tool generally includes a fixed platform, an AC axis, a movable platform, four connection branched chains, two sliding seats and two upright posts. A parallel connection part of the machine tool has two translational freedom degrees on a plane, while a series connection part (that is, the AC axis) has two rotation freedom degrees in a space. In order to apply the machine tool in the processing industry successfully, a relatively weak link, that is, the static stiffness of the non-plane direction, of the structure needs to be improved. In the invention, four connecting bars are used for strengthening the connection branched chains, the integrity is improved, and the whole static stiffness, especially the static stiffness of the non-plane direction, of the machine tool is enhanced. The invention canraise the static stiffness of the non-plane direction of the machine tool and is characterized by small motion mass, low manufacturing cost, easy maintenance, and so on.

The invention relates to a contact-type three-dimensional scanning measuring head measuring device and belongs to the field of precision measurement. The measuring device is suitable for micrometric displacement measuring and three-dimensional microsize measuring. The measuring device comprises a mechanical measuring head part and a grating signal processing part. An elastic parallelogram structure composed of a parallel spring piece structure and four double-hinge rods in the y direction, the x direction and the z direction is arranged in the mechanical measuring head part. When the scanning measuring head measuring device is used, measuring force and displacement in any direction are decomposed to measuring force and displacement in plane horizontal motion and motion perpendicular to the plane direction, compared with displacement which is directly decomposed in three directions, the mechanical structure of a measuring head is greatly simplified, a three-dimensional Abbe arm of the measuring head is reduced, an error transmission chain is shortened, in addition, motion weight and measuring force in the three directions are equal, deflecting force is even, dynamic property is identical, part machining is easy, cost is low, and mounting and debugging are easy.

The invention relates to a method for designing double-curvature automobile door glass on the basis of drum-shaped line theories. The method includes steps of (1), determining geometric input models according to characteristics of double-curvature glass and modeling A surfaces; (2), determining parameterized drum shaft positions according to the geometric input models; (3), determining contour lines of front and rear boundaries of glass surfaces according to characteristics of drum-shaped lines; (4), generating double-curvature glass surfaces by means of sweeping according to parameterized waist lines and the contour lines. The method has the advantages that the coincidence degrees of the double-curvature glass surfaces and the modeling A surfaces can be upgraded, interference between the double-curvature glass and automobile door accessories in lifting procedures can be reduced, and the movement stability and reliability can be improved; the traditional ring surface design models are improved, the drum shaft positions are optimized, the drum-shaped double-curvature glass is designed, accordingly, standard guidance effects can be realized, the method is favorable for improving the fitting precision and the movement quality of the double-curvature glass and reducing the failure rate and has high engineering practical value, and major requirements on improving the automobile body development capacity of the automobile industry can be met.