초록 ▼

Adjusting mechanism for the step-wise height adjustment of the backrest of a work chair comprises two U-form guide bars embracing side edges of a rectangular support arm extending up from the seat of the chair. A C-form slide, on which the backrest is mounted, embraces and is slidable on the guide b

Adjusting mechanism for the step-wise height adjustment of the backrest of a work chair comprises two U-form guide bars embracing side edges of a rectangular support arm extending up from the seat of the chair. A C-form slide, on which the backrest is mounted, embraces and is slidable on the guide bars. One of the guide bars has a wider flange in which locking recess are formed. A locking lever pivotally mounted on the slide has a nose portion engageable in the locking recesses to hold the slide and hence the backrest in selected fixed position. The locking lever is spring biased to locking position and is releasable by a handle at the side of the slide so that the locking lever can be released and the slide, with the backrest, moved up or down with one hand.

대표청구항 ▼

Adjusting mechanism for lockable step-wise height adjustment of the backrest of a work chair having an approximately vertical support arm on which the backrest is mounted, said mechanism comprising a pair of elongate guide bars extending along and affixed to said support arm, one of said guide bars

Adjusting mechanism for lockable step-wise height adjustment of the backrest of a work chair having an approximately vertical support arm on which the backrest is mounted, said mechanism comprising a pair of elongate guide bars extending along and affixed to said support arm, one of said guide bars having therein a series of locking recesses, a slide embracing said support arm and guide bars and providing a support for said backrest, said slide being slidable along and guided by said guide bars in a direction lengthwise of said support arm, a locking lever pivotally mounted on said slide and having a nose engageable in said locking recesses of said one guide bar, said locking lever being movable between a locked position in which said nose of said locking lever is engaged in one of said recesses to thereby prevent movement of said slide and an unlocked position in which said nose is free of said recesses, means biasing said locking lever to locked position and manually operable releasing means external of said slide for moving said locking lever against said bias to unlocked position.