Minitype breaker with high stability

摘要

A high-stability miniature circuit breaker has a pivotal shaft having a first section, a second section and a shoulder. The diameter of the second section is larger than the first section. The shoulder diameter is larger than the second section. A pivoting lever on the first section limits the axial position of a protruding mesa relative to the shaft by contact fit between the mesa and a thrust surface on the second section. A pivoting latch is on the second section. A first end face fits to a support surface on the shoulder. A second end face fits to the protruding mesa at the other end. The latch controls a drive rod and the lever. A connecting rod separates from the latch when latch hasps are separated and the latch separates from the drive rod which slides along a groove of the lever.

主权项

1. A high-stability miniature circuit breaker, comprising a release, an operating mechanism, an arc extinguish chamber and a contact assembly, wherein said operating mechanism comprises a handle installed on a handle shaft of a shell in a pivoting way, a drive rod, a lever, a connecting rod installed on a pivotal shaft of the lever in a pivoting way, a latch assembly, a return spring; one end of said drive rod is connected to a hinge of the handle, the other end of the drive rod is connected to the lever, and the end of the drive rod connected to the lever is also fitted with a control end of the connecting rod and controlled by the control end; and said contact assembly is connected to the lever through a contact support, wherein:
said operating mechanism further comprises a pivotal shaft fixed on the shell, which comprises a first shaft section, a second shaft section and a shaft shoulder; a diameter of said second shaft section is larger than that of the first shaft section, and a thrust surface is formed on the second shaft section at a transition portion of the two shaft sections; a diameter of said shaft shoulder is larger than that of the second shaft section, and a support surface is formed on the shaft shoulder at the transition portion of the second shaft section and the shaft shoulder; said lever is installed on the first shaft section of the pivotal shaft through a first shaft hole in a pivoting way, and is used for limiting the axial position of a protruding mesa relative to said pivotal shaft through contact fit between the protruding mesa disposed on the lever and the thrust surface on said pivotal shaft; said latch assembly is installed on the second shaft section of the pivotal shaft through a second shaft hole in a pivoting way; one end of said second shaft hole comprises a first end face fitted with a support surface of said pivotal shaft; the other end of said second shaft hole comprises a second end face fitted with the protruding mesa of the lever; and the latch assembly is also provided with a second hasp; a first hasp fitted with the second hasp of the latch assembly is disposed on said connecting rod, said connecting rod is meshed with the latch assembly when the first hasp and the second hasp are contacted and latched with each other, and the latch assembly controls the drive rod and the lever not to move relatively; said connecting rod is separated from the latch assembly when the first hasp and the second hasp are separated and unlatched, and the latch assembly is separated from the drive rod to lead the drive rod to be capable of sliding along a groove of the lever.