2results about How to "Good locking effect" patented technology

A roller reamer for oilfield drilling, relating to the field of oilfield drilling tools, includes a connecting body, a roller shaft, a roller, a shaft seat, a connecting bolt, a connecting disc, and a locking sleeve. Two shaft seats are respectively connected and installed in slots opened on the connecting body using connecting bolts. The roller shaft is connected between the shaft seats, and the roller is fitted on the roller shaft. The head of the connecting bolt has a transverse groove. The connecting disc and the locking sleeve are sequentially installed in the bolt connection hole. An upper key pin and a lower key pin are respectively provided on the upper and lower end faces of the connecting disc. The lower key pin corresponds to and fits into the transverse groove. The inner circumferential surface of the locking sleeve has a reverse thread, and the bottom end has a limiting groove that corresponds to and fits into the upper key pin. A strip-shaped sawtooth ridge is provided in the bolt connection hole. The locking sleeve is interference-fitted and impact-embedded into the bolt connection hole, establishing a sawtooth meshing fit with the shaft seat. This can limit and constrain the connecting bolt in the axial direction and also rotate and constrain the connecting bolt in the circumferential direction, strengthening the locking effect on the connecting bolt and improving the locking effect.

The utility model belongs to the field of headrests, and provides a vehicle seat headrest which is characterized in that a guiding part parallel to the rotating direction of a front support is formed on a traction piece, and at least two locking grooves are distributed in the guiding part; the locking pin is connected to the front support and movably clamped in the locking groove so that the front support can be limited to the folding position or the unfolding position. Compared with the prior art, the utility model has the advantages that the locking pin is matched with the locking groove on the traction piece, so that the front support is firmly locked after being adjusted to a required position (whether folded or unfolded), the whole structure is simple, the whole thickness of the headrest is thinner, the space in a vehicle is saved, and the use is convenient. Compared with a hard locking structure of a ratchet wheel and a pawl, according to the headrest structure in the scheme, the position can be adjusted only by applying proper pressure to the front support by a user, the test requirement of a headrest whiplash test is met, and the use safety and stability are improved to a great extent.