CHICORA — Felony and misdemeanor assault charges have been withdrawn against a Center Township man accused of rigging a booby trap at his home.

But Kenneth G. Robinson’s legal troubles are not over.

“We’re happy,” Al Lindsay, Robinson’s attorney, said Tuesday outside the office of District Judge Lewis Stoughton in Chicora. “The most serious charges have been withdrawn because there was not sufficient evidence to support them.”

Following negotiations with Lindsay before Robinson’s preliminary hearing, Butler County Assistant District Attorney Russ Karl said prosecutors would no longer pursue charges of aggravated assault and simple assault.

But the 47-year-old Robinson still faces charges of illegal possession of a firearm, a felony, and reckless endangerment, a misdemeanor. He is free on $25,000 bail.

State police last week arrested Robinson on charges he endangered his then live-in girlfriend when he booby-trapped his home on Unionville Road with a swinging trap door loaded with nearly two dozen nails.

The device, police said, was meant to harm anyone who entered the back door.

According to court documents, Robinson was angry with Jeannie Summers, 42, because she obtained a protection-from-abuse order against him. He changed the locks to the home and allegedly set the trap.

But Summers discovered the booby-trapped door Sept. 16 when she climbed through an unlocked window to enter the house. She was not hurt.

Once inside, Summers also noticed a 12-gauge shotgun on the back of the couch in the living room. She said she had never seen the gun before.

Police said Summers knew Robinson was prohibited by state law of possessing any firearm because of a prior felony conviction.

Trooper Craig Johnson, the investigating officer, said Robinson claimed he rigged the trap to thwart would-be burglars, not his girlfriend.

“The decision about the charges was made based on the totality of the circumstances,” Johnson said following Tuesday’s proceedings. “We believe the most appropriate charges remain filed.”

While Johnson conceded that Robinson may have set the device to safeguard his house, such booby traps — those intended to maim or kill — are still against the law.