Adjusting Device Coacting Arm Rests in a Chair

Abstract

An adjusting device which can be implemented in a chair and which can be utilized to coact with two arm rests thereof includes a first and second blocks aligned coaxially with each other. A first and a second plates which are adapted for connecting the two arm rests respectively are moveably attached to the first and second blocks respectively. An adjusting mechanism interconnects the first and second plates and is operable to urge the first plate with respect to the first block and the second plate with respect to the second block concurrently, and in which the first and second plates are moved oppositely by the actuating device.

1 . An adjusting device which can be implemented in a chair and which can be utilized to coact with two arm rests thereof comprising:
 a first and a second blocks adapted for mounting on the chair aligned coaxially with each other;   a first and a second plate adapted for connecting the two arm rests respectively moveably attached to the first and second blocks respectively; and   an adjusting mechanism interconnecting the first and second plates and being operable to urge the first plate with respect to the first block and the second plate with respect to the second block concurrently and;   wherein the first and second plates are moved oppositely by the actuating device.   
   
   
       2 . The adjusting device as claimed in  claim 1  further comprising a positioning mechanism installed to the first plate so as to hold a relative movement of the first plate with respect to the first block and a relative movement of the second plate with respect to the second block. 
   
   
       3 . The adjusting device as claimed in  claim 2  wherein each of the first and second blocks includes an array of plurality of holes, and wherein the positioning mechanism includes a lever arm and an engaging member, with the lever arm being operable to move the engaging member to selectively engage in one of the array of plurality of holes in the first block. 
   
   
       4 . The adjusting device as claimed in  claim 1  wherein each of the first and second plates includes a through slot, and wherein the adjusting mechanism includes a linking member attached fixedly to the first plate and having a plurality of teeth formed thereon, and wherein the adjusting mechanism further includes a coupling member attached fixedly to the second plate and having a plurality of teeth formed thereon, and with the plurality of teeth on the coupling member being opposite to the plurality of teeth on the linking member, and wherein the adjusting mechanism further includes a shaft inserted through the slot of the second plate and connected fixedly to the second block, and wherein the adjusting mechanism further includes a pinion rotatably moveable with respect to the shaft and interconnecting the teeth of the linking member and the teeth of the coupling member. 
   
   
       5 . The adjusting device as claimed in  claim 3  wherein each of the first and second plates includes a through slot, and wherein the adjusting mechanism includes a linking member attached fixedly to the first plate and having a plurality of teeth formed thereon, and wherein the adjusting mechanism further includes a coupling member attached fixedly to the second plate and having a plurality of teeth formed thereon, and with the plurality of teeth on the coupling member being opposite to the plurality of teeth on the linking member, and wherein the adjusting mechanism further includes a shaft inserted through the slot of the second plate and connected fixedly to the second block, and wherein the adjusting mechanism further includes a pinion rotatably moveable with respect to the shaft and interconnecting the teeth of the linking member and the teeth of the coupling member 
   
   
       6 . The adjusting device as claimed in  claim 3  further comprising a lug formed on the first plate, and wherein the lever arm is pivotally connected to the lug. 
   
   
       7 . The adjusting device as claimed in  claim 6  wherein the lever arm includes a pin connected thereto, and with the pin including a portion located between the lever arm and the first plate, and with the portion receiving a resilient member. 
   
   
       8 . The adjusting device as claimed in  claim 1  wherein each of the first and second plates includes a through slot, and wherein the adjusting mechanism includes a first link having a first end pivotally attached to the first plate and a second end, a second link having a first end pivotally attached to the second end of the first link and a second end, and a third link having a first end pivotally attached to the second end of the second link and a second end pivotally attached to the second plate, and wherein the adjusting mechanism further includes one shaft inserted through the through slots of first plate and connected fixedly to the first block, and another shaft inserted through the through slot of the second plate respectively and connected fixedly to the second block respectively. 
   
   
       9 . The adjusting device as claimed in  claim 3  wherein each of the first and second plates includes a through slot, and wherein the adjusting mechanism includes a first link having a first end pivotally attached to the first plate and a second end, a second link having a first end pivotally attached to the second end of the first link and a second end, and a third link having a first end pivotally attached to the second end of the second link and a second end pivotally attached to the second plate, and wherein the adjusting mechanism further includes one shaft inserted through the through slots of first plate and connected fixedly to the first block, and another shaft inserted through the through slot of the second plate respectively and connected fixedly to the second block respectively. 
   
   
       10 . The adjusting device as claimed in  claim 9  further comprising a lug formed on the first plate, and wherein the lever arm is pivotally connected to the lug. 
   
   
       11 . The adjusting device as claimed in  claim 10  wherein the lever arm includes a pin connected thereto, and with the pin including a portion located between the lever arm and the first plate, and with the portion receiving a resilient member. 
   
   
       12 . The adjusting device as claimed in  claim 1  wherein the first and second blocks are moveably installed on a platform and are operable to move concurrently in a direction, and each includes a through slot and a shaft inserted through the through slot and connected fixedly to the block. 
   
   
       13 . The adjusting device as claimed in  claim 12  wherein the adjusting mechanism includes a secondary adjusting mechanism including a coupling member attached fixedly to one of the first and second blocks and having a plurality of teeth formed thereon, and wherein the secondary adjusting mechanism further includes a pinion being operable to engage with the plurality of teeth of the coupling member. 
   
   
       14 . The adjusting device as claimed in  claim 12  wherein each of the first and second plates includes a through slot, and wherein the adjusting mechanism includes a linking member attached fixedly to the first plate and having a plurality of teeth formed thereon, and wherein the adjusting mechanism further includes a coupling member attached fixedly to the second plate and having a plurality of teeth formed thereon, and with the plurality of teeth on the coupling member being opposite to the plurality of teeth on the linking member, and wherein the adjusting mechanism further includes a shaft inserted through the slot of the second plate and connected fixedly to the second block, and wherein the adjusting mechanism further includes a pinion rotatably moveable with respect to the shaft and interconnecting the teeth of the linking member and the teeth of the coupling member. 
   
   
       15 . The adjusting device as claimed in  claim 12  further comprising a positioning mechanism installed to the first plate so as to hold a movement of the first plate with respect to the first block and a movement of the second plate with respect to the second block. 
   
   
       16 . The adjusting device as claimed in  claim 15  wherein each of the first and second blocks includes a plurality of holes, and wherein the positioning mechanism includes a lever arm and an engaging member, with the lever arm being operable to move the engaging member to selectively engage in one of the plurality of holes in the first block. 
   
   
       17 . The adjusting device as claimed in  claim 14  further comprising a positioning mechanism installed to the first plate so as to hold a movement of the first plate with respect to the first block and a movement of the second plate with respect to the second block. 
   
   
       18 . The adjusting device as claimed in  claim 17  wherein each of the first and second blocks includes a plurality of holes, and wherein the positioning mechanism includes a lever arm and an engaging member, with the lever arm being operable to move the engaging member to selectively engage in one of the plurality of holes in the first block.