Adjusting apparatus

Abstract

A chair has a seat mounted on a pedestal with a swivel and tilt function. The pedestal has an inner part and an outer part that are telescopically engaged. The outer part rotates with respect to the inner part. A bracket secures the underside of the seat to the upper end of the outer part. There are a series of holes in the upper end of the outer part. A selectively operable locking member mounts on the bracket. The locking member includes a detent for engaging in one of the holes. A releasing member releases the detent from one of the holes and enables insertion in another hole after rotation of the outer part relative to the inner part. A spring can bias the detent to the engaged position. The seat can neither be swivelled nor tilted when the locking member is in engaged position.

I claim:  
     
         1 . A chair having a seat with a swivel and tilt function, the seat being mounted on a pedestal and a device whereby tilting and swivelling of the seat is obviated, the device comprising: 
 (i) a member defining the pedestal, the member having:    (ii) an inner part, and    (iii) an outer part;    (iv) the inner and outer parts being telescopically arranged;    (v) the outer part also being relatively rotatable with respect to the inner part;    (vi) a bracket secured to an underside of the seat and to the upper end of the outer part;    (vii) a series of circumferentially arranged through holes at an upper end of the outer part;    (viii) a selectively operable locking device mounted on the bracket;    (ix) said locking device having a detent which has an engaged position in a facing one of said through holes;    (x) said locking device being manually shiftable between a position withdrawn from the outer part and a position engaged in a through hole of the outer part; and    (xi) a manually grippable member for releasing the detent from one hole and insertion in another after telescopic movement and relative rotation of the outer part relative to the inner part, whereby to secure the seat in a desired position and to obviate tilting and swivelling of the seat relative to the pedestal.    
     
     
         2 . A chair as defined in  claim 1 , wherein the detent comprises a reciprocable finger device.  
     
     
         3 . A chair as defined in  claim 1 , wherein the said detent comprises a finger device biased towards the engaged position by biasing means.  
     
     
         4 . A chair as defined in  claim 3 , wherein the biasing means for biasing the fingers device to the engaged position is a coil spring.  
     
     
         5 . A chair as defined in  claim 1 , wherein the device comprises a manually operable device remote from the locking means and connected thereto by a flexible elongate member.  
     
     
         6 . A chair as defined in  claim 5 , wherein the flexible elongate member comprises a cable.  
     
     
         7 . A chair as defined in  claim 6 , wherein the cable is slidable in a housing.  
     
     
         8 . A chair as defined in  claim 1 , wherein the seat is mounted on the inner part of the member.