A locking structure for handlebar stem and front fork of bicycle includes a handlebar stem (40), a front fork (50) and a locking unit.

Also disclosed is a single-cylinder pin type telescopic arm device adopting the above pin interlocking device.

The invention can be used to lock the saddle (4) stem (3) of fully-suspended-type bikes.

The rod holder comprises a push jaw (400) disposed on a first end of a screw (500).

Disclosed is a pin interlocking device, which comprises a sleeve (4) sleeved on a telescopic oil cylinder (1).

A single use syringe (20) and a plunger rod locking device (60) for such a syringe are provided.

This upper case (32) also has a contact rod clamp means within each hole (35) for holding the contact rod (21) before an application of silicone.

A latch is provided between the support bar and the locking bar, adjacent the second end of the locking bar.

A first surface of the lock pin interfaces the lock cam and a second surface of the lock pin interfaces the lower quadrant.

A locking element is mounted to each stem.

The stop rod has a control cam oriented in the longitudinal direction.

The present locking device is provided with a first locking piece, a second locking piece, and a pin shaft (2).

The locking bar deflects under the weight of the hung article to engage the latch and to secure the hung article between the locking bar and the support bar.

The locking member may be an integral hook, a separate hook, or a cylindrical locking rod.

The lock rod (20) of the present invention includes a variable sloped ramp (30) for engagement with each locking ball (32, 34).