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Straight bar push-down is a variation that involves connecting a straight bar attachment to a cable machine. In executing this variation, the bar is gripped with the knuckles facing up and the elbows are held close to the body. This variation targets the long head of the triceps (coloured red in Figure 2). [1]
Do not hold the arms straight over the face at 12 o'clock, but rather at an angle more like 10 o'clock, with feet at 3 o'clock. All of the weight should be on the triceps. Now bend the arms at the elbow, bringing the bar down close to the top of the forehead. Keep the elbows in the same position, do not let them sway outward.
Five bar linkages often have meshing gears for two of the links, creating a one DOF linkage. They can provide greater power transmission with more design flexibility than four-bar linkages. Jansen's linkage is an eight-bar leg mechanism that was invented by kinetic sculptor Theo Jansen. Klann linkage is a six-bar linkage that forms a leg mechanism;
The Evans 'grasshopper' linkage is a variant of a Scott Russell linkage which uses a long link to create a large enough arc to approximate a line. The Bricard inversor directly incorporates the Scott Russell's links, replacing the previously required straight line connection and allowing for two exact straight line outputs at right angles.
Watt's linkage consists of three bars bolted together in a chain. The chain of bars consists of two end bars and a middle bar. The middle bar is bolted at each of its ends to one of the ends of each outer bar. The two outer bars are of equal length, and are longer than the middle bar. The three bars can pivot around the two bolts.
In the study of mechanisms, a four-bar linkage, also called a four-bar, is the simplest closed-chain movable linkage. It consists of four bodies, called bars or links, connected in a loop by four joints. Generally, the joints are configured so the links move in parallel planes, and the assembly is called a planar four-bar linkage. Spherical and ...
Variations can include touching the bar to the chest (sternum) versus the back of the neck, [1] or varying hand spacing (wide versus narrow) or orientation (pronated versus supinated). The exercise can also be done using cable machines, a handle attached to a cable is pulled toward the body, this can be done while seated on a bench or stability ...
A straight-line mechanism is a mechanism that converts any type of rotary or angular motion to perfect or near-perfect straight-line motion, or vice versa. Straight-line motion is linear motion of definite length or "stroke", every forward stroke being followed by a return stroke, giving reciprocating motion .