초록 ▼

Recoil spring mechanisms are useful, for example, in relieving excessive tension in the track of track-type vehicles. Because the idler wheels recoil in a one-to-one relationship against a recoil spring, the tension in the track still increases drastically from when recoil first starts to full recoi

Recoil spring mechanisms are useful, for example, in relieving excessive tension in the track of track-type vehicles. Because the idler wheels recoil in a one-to-one relationship against a recoil spring, the tension in the track still increases drastically from when recoil first starts to full recoil. The subject variable leverage recoil mechanism has the idler wheel mounting bracket and first and second links arranged such that equal increments of movement of the idler wheel from a normal operating position toward a recoiled position results in progressively decreasing increments of compression of the recoil spring. This results in the idler wheel having a progressively increasing mechanical advantage over the recoil spring when the idler wheel move toward a recoiled position.

대표청구항 ▼

A recoil mechanism for resiliently resisting recoil movement of an idler wheel of a track belt mechanism having a track belt entrained around the idler wheel and a drive wheel comprising: a frame; an elongate recoil spring mechanism having first and second end portions, said first end portion being

A recoil mechanism for resiliently resisting recoil movement of an idler wheel of a track belt mechanism having a track belt entrained around the idler wheel and a drive wheel comprising: a frame; an elongate recoil spring mechanism having first and second end portions, said first end portion being connected to the frame; an idler wheel mounting bracket having first and second end portions and an intermediate portion therebetween, said idler wheel being rotatably mounted to the intermediate portion, said first end portion being pivotally connected to the frame at a first pivot wherein said mounting bracket is pivotal about the first pivot between a first position at which the idler wheel is at a normal operating position and a second position at which the idler wheel is at a recoiled position; a link having first and second end portions, said first end portion being pivotally connected to the second end portion of the mounting bracket at a second pivot and said second end portion being pivotally connected to the second end portion of the recoil spring mechanism at a third pivot; and means for guiding the third pivot in a preselected path so that the third pivot moves basically rearwardly toward the drive wheel through the total range of movement and moves slightly upwardly away from the frame during the initial portion of its rearward movement.