초록 ▼

A linear lost motion mechanism is located within a tubular handle of a machine, such as a concrete finishing machine. The linear lost motion mechanism includes a pitch block configured to selectively frictionally lock with the tubular handle or a component attached to the tubular handle using a bias

A linear lost motion mechanism is located within a tubular handle of a machine, such as a concrete finishing machine. The linear lost motion mechanism includes a pitch block configured to selectively frictionally lock with the tubular handle or a component attached to the tubular handle using a biasing spring. The linear lost motion mechanism can perform a number of functions, such as controlling a blade pitch adjustment system of a concrete finishing machine.

대표청구항 ▼

What is claimed is: 1. A trowel blade pitch adjustment system comprising:a rack located within a handle tube of a concrete trowel, the rack attached to the handle tube such that motion relative to the rack is also relative to the handle tube;a pitch block located within the handle tube, the pitch bl

What is claimed is: 1. A trowel blade pitch adjustment system comprising:a rack located within a handle tube of a concrete trowel, the rack attached to the handle tube such that motion relative to the rack is also relative to the handle tube;a pitch block located within the handle tube, the pitch block comprising an aperture containing one or more pins biased onto the rack by an angled upper surface and a biasing spring, thereby frictionally locking the pitch block to the rack;a release located within the handle tube and configured to compress the biasing spring upon actuation, thereby releasing the frictional lock between the pitch block and the rack; anda tension cable coupled to the pitch block and extending through the handle tube to engage with a blade rotation apparatus configured to pivotally rotate one or more blades of the concrete trowel.