초록 ▼

An upper part of a column can be pivotally lowered and raised relative to a lower part thereof for servicing of an appliance mounted thereon. However, before the column part can be lowered it must be raised through a limited vertical displacement relative to the column part. A releasable locking dev

An upper part of a column can be pivotally lowered and raised relative to a lower part thereof for servicing of an appliance mounted thereon. However, before the column part can be lowered it must be raised through a limited vertical displacement relative to the column part. A releasable locking device is provided to hold the column part at the upper end of this displacement, and comprises configurated slots which receive a rotatable pivot shaft. Each slot has relatively wide portions and a relatively narrow portion and the shaft is so shaped that it can pass into the narrow portion (and thereby permit said limited vertical displacement of the column part) only when it occupies a predetermined angular orientation.

대표청구항 ▼

A column-mounted appliance comprising a column composed of a lower column part and an upper column part, a generally horizontal pivot by means of which said upper column part is connected to said lower column part for pivotal lowering and raising movement relative thereto, an applicance mounted on s

A column-mounted appliance comprising a column composed of a lower column part and an upper column part, a generally horizontal pivot by means of which said upper column part is connected to said lower column part for pivotal lowering and raising movement relative thereto, an applicance mounted on said upper column part, means permitting said upper column part to be moved relative to said lower column part through a limited vertical displacement between a lock position and a release position, a mechanical interlock operative to prevent said upper column part from being pivotally lowered about said generally horizontal pivot unless said upper column part is first moved through said limited vertical displacement into said release position, and a releasable locking device operable to hold said upper column part in said release position during pivotal lowering and raising of said upper column part, said locking device being composed of normally vertically disposed closed ended configurated slot means provided in one of said upper and lower column parts and a shaft rotatably mounted on the other of said upper and lower column parts, the configurated slot means including a relatively narrow portion and a first relatively wide portion, said shaft being received in the configurated slot means and being moved from one of said relatively narrow and wide portions to the other as said upper column part is moved between said lock and release positions, said shaft having an external surface which is non-circular in cross-section and being rotatable relative to said other of said column parts between a first rotational position wherein said shaft can enter said relatively narrow portion of the configurated slot means and a second rotational position wherein said shaft cannot enter said relatively narrow portion.