Door closer and holder

• US 4,793,023 A
• Filed: 06/15/1987
• Issued: 12/27/1988
• Est. Priority Date: 06/15/1987
• Status: Expired due to Term

• Current Assignee: Yale Security Incorporated (Assa Abloy AB)
• Original Assignee: Yale Security Incorporated (Assa Abloy AB)
• Inventors: Simpson, Jeffery M., Tully, Clay E.
• Primary Examiner(s): Godici, Nicholas P.
• Assistant Examiner(s): Cuda, Carmine
• Application Number:
  US07/061,785
• Time in Patent Office: 561 Days
• Field of Search: 16/49, 16/51, 16/52, 16/56, 16/58, 16/62, 16/66
• US Class Current: 16/58
• CPC Class Codes: E05F 3/102 with rack-and-pinion transmission between driving shaft and piston within the closer housing
• CPC Class Codes: E05F 3/12 Special devices controlling the circulation of the liquid, e.g. valve arrangement E05F3/223 takes precedence; valves per se F16K
• CPC Class Codes: E05F 3/223 Hydraulic power-locks, e.g. with electrically operated hydraulic valves
• CPC Class Codes: E05Y 2201/21 Brakes
• CPC Class Codes: E05Y 2201/256 with pistons or vanes
• CPC Class Codes: E05Y 2201/264 linear
• CPC Class Codes: E05Y 2400/818 with visual display
• CPC Class Codes: E05Y 2900/132 Doors

Abstract

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.

Claims

1. 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.

2. A door closer and holder as claimed in claim 1 including a latch speed control valve in the latch passage means and a sweep speed control valve in the sweep passage means.

3. A door closer and holder as claimed in claim 1 wherein the plunger has at its end more remote from the shell a tapered end diverging away from the wall of the plunger chamber and partly occluding the second opening when the plunger is in the first position.

4. A door closer and holder as claimed in claim 1 including a bullet chamber in the manifold in side-by-side relation with the plunger chamber, the bullet chamber being disposed in the inlet passage means, and a solenoid adapted to drive the bullet to close the inlet passage to hold the door open.

5. A door closer and holder as claimed in claim 4 wherein the solenoid is insufficiently strong to move the bullet to close the port when the door is closing, but can so move the bullet when the door is not closing.

6. A door closer including an oil-filled housing having a piston circumposed by resilient sealing means sealingly engaging the wall of the housing, means linking the movement of the piston and the door, spring means in the cylinder urging the piston toward one end of the cylinder to close the door, first passage means connecting the said one end of the cylinder with a point in the housing on the other side of the piston from said end, a pair of separately settable metering valves alternately connectable in the passage means, and shuttle valve means alternately connecting the settable metering valves in the first passage means, the shuttle valve means having an actuator extending into the housing and engaged by and depressed by the piston as it approaches the said end of the cylinder, and second passage means. connecting the oil on the opposite sides of the piston sealing means and including check valve means adapted to close as the piston moves toward the said end and open when it moves in the reverse direction.

7. A door closer as claimed in claim 6 wherein the shuttle valve means comprises a plunger operating in a chamber, the first passage means being connected to the opposite ends of the chamber to flow through the chamber and three openings are longitudinally spaced along the side wall of the chamber, the center opening connected to each of the metering valves, the metering valves also being connected respectively to the other two openings, whereby the plunger as it moves in the chamber selects which of the two valves controls the flow in the first passage means.