Claims
- 1. An improved adjustable arm structure which includes first and second elongated arm assemblies located relative to one another so as to have adjacent ends and remote ends, a connecting joint means connecting the adjacent ends of said elongated arm assemblies, a mounting joint means for use in mounting said structure at the remote end of said first elongated arm assembly, each of said arm assemblies including first and second parallel links, said links of said first arm assembly being pivotally connected to said mounting joint means and said connecting joint means, said links of said second arm assembly being pivotally connected to a holding joint means and said connecting joint means, in which the improvement comprises:
- said connecting joint means including a frame means, said links of said arm assemblies being pivotally connected to said frame means at different locations on said frame means;
- said connecting joint means also including a first sector plate attached to a link of said first arm assembly and a second sector plate attached to a link of said second arm assembly, said sector plates extending parallel to one another, said sector plates overlying one another, and said sector plates containing arcuate slots which overlap each other in all positions of said sector plates whereby said arm assemblies may be independently moved and positioned relative to said connecting joint means;
- said connecting joint means also including a bolt means extending through said arcuate slots of said sector plates for clamping and securing said sector plates within said frame means so as to hold said arm assemblies against movement by preventing any change in the distance between the links in said arm assemblies;
- said bolt means being mounted on said frame means so as to be incapable of transverse movement relative to said frame means during the use of said arm structure whereby said bolt means will remain stationary during any movement of said arm assemblies and said arcuate slots
- said bolt means further including a nut means for use in securing said sector plates by tightening and loosening said bolt means.
- 2. An adjustable arm structure as claimed in claim 1 wherein:
- each of said arucate slots is centered around the pivotal connection between the link on which it is located and said connecting joint.
- 3. An adjustable arm structure as claimed in claim 2 wherein:
- said pivotal connections of said links upon which said sector plates are located to said connecting joint are spaced from one another.
- 4. An adjustable arm structure as claimed in claim 1 wherein:
- each of said arcuate slots is centered around the pivotal connection between the link on which it is located and said connecting joint;
- said pivotal connections of said links upon which said sector plates are located being spaced from one another; and
- said connecting joint means also includes a cover means for covering said sector plates and the pivotal connections between said links and said connecting joint means.
Parent Case Info
This is a continuation of application Ser. No. 054,422 filed on May 26, 1987, now abandoned.
US Referenced Citations (4)
Continuations (1)
|
Number |
Date |
Country |
Parent |
54422 |
May 1987 |
|