Terry v. Ohio, 392 U.S. 1 (1968), was a decision by the United States Supreme Court which held that the Fourth Amendment prohibition on unreasonable searches and seizures is not violated when a police officer stops a suspect on the street and searches him without probable cause to arrest, if the police officer has a reasonable suspicion that the person has committed, is committing, or is about to commit a crime.
The rationale behind the Supreme Court decision revolves around the understanding that, as the opinion notes, "the exclusionary rule has its limitations." The meaning of the rule is to protect persons from unreasonable searches and seizures aimed at gathering evidence, not searches and seizures for other purposes (like prevention of crime or personal protection of police officers).
I found no reference to "Chimel." However, a concurring decision was written by Justice White, and a dissenting opinion was written by Justice Douglas.