초록 ▼

A door closer and holder comprises a cylinder shell having a piston sealingly reciprocable therein. A spring biases the piston toward one end of the shell, and the piston is connected through the ususal apparatus to the door. At the one end the operating rod of a shuttle valve extends into the shell

A door closer and holder comprises a cylinder shell having a piston sealingly reciprocable therein. A spring biases the piston toward one end of the shell, and the piston is connected through the ususal apparatus to the door. At the one end the operating rod of a shuttle valve extends into the shell and is engaged by the piston as it approaches the end. The shuttle valve selectively directs the return fluid flow through sweep- and latch-control valves. The assembly also includes a solenoid-operated “bullet”which closes off the return flow to hold the door open. The angle of the openness at which the door is held may be selected by setting a cam on the holder drive pinion which engages a switch to activate the solenoid.

대표청구항 ▼

A door closer and holder comprising: a. an assembly including an oil-filled closed cylinder shell having therewithin a reciprocable journal in sealing engagement with the wall thereof; b. a control manifold at one end of the shell, the manifold being formed with a plunger chamber, the chamber being

A door closer and holder comprising: a. an assembly including an oil-filled closed cylinder shell having therewithin a reciprocable journal in sealing engagement with the wall thereof; b. a control manifold at one end of the shell, the manifold being formed with a plunger chamber, the chamber being generally cylindrical, c. a plunger in the plunger chamber and having a shaft extending through a sealed bore in the manifold and into the interior of the shell to be engaged and depressed by the journal near the end of its travel toward the manifold end, d. biasing means urging the plunger toward the shell, e. in the manifold and shell, (1) inlet passage means interconnecting the manifold end of the shell and the plunger chamber at an opening in the chamber on the opposite side of the plunger from the shell, (2) drain passage means interconnecting the end of the plunger chamber more adjacent the shell and an opening in the shell on the opposite side of the journal from the manifold, (3) latch passage means interconnecting longitudinally spaced first and second openings in the wall of the plunger chamber, the first opening being more remote from the shell than the second opening, both openings being outward of the plunger when the plunger is in a first position close to the shell, and on opposite sides of the plunger when the plunger is moved by the journal to a second position away from the shell, (4) sweep passage means interconnecting the second opening and a third opening in plunger chamber at a point on the opposite side of the plunger from the other two openings when the plunger is in the first position, f. spring means urging the journal toward the manifold, g. check valve means in a return passageway in the assembly, the passageway communicating between oil on opposite sides of the journal, the check valve means adapted to open during movement of the journal away from the manifold end and close during movement of the journal toward the manifold end, and h. rack and pinion and operator arm means associated with the journal to convert the motion of the journal into motion-controlling means for the door.