Door closer

• US 5,943,736 A
• Filed: 01/28/1998
• Issued: 08/31/1999
• Est. Priority Date: 01/29/1997
• Status: Expired due to Fees

• Current Assignee: Abloy Oy (Assa Abloy AB)
• Original Assignee: Abloy Oy (Assa Abloy AB)
• Inventors: Karkkainen, Vesa, Junttila, Jaakko
• Primary Examiner(s): Mah, Chuck Y.
• Application Number:
  US09/014,831
• Time in Patent Office: 580 Days
• Field of Search: 16/79, 16/62, 16/69, 16/64, 16/58, 16/52, 16/53, 16/DIG. 10, 16/DIG. 9
• US Class Current: 16/79
• CPC Class Codes: E05F 3/102 with rack-and-pinion transmission between driving shaft and piston within the closer housing
• CPC Class Codes: E05Y 2201/618 Transmission ratio variation
• CPC Class Codes: E05Y 2201/722 Racks
• CPC Class Codes: E05Y 2900/132 Doors

Abstract

A door closer includes a casing-like body enclosing a piston member, which is movable back and forth according to the movements of a door and is in cooperation with at least one closer spring, and a closer shaft and a pinion member connected thereto for transmitting the force of the movement of the door to the piston member. The pinion member is mounted on the closer shaft eccentrically with respect to its rolling curve. The piston member is casing-like and is provided with a toothing arranged at its inner surface. The rolling curve of the piston'"'"'s toothing is at least substantially linear and is inclined relative to the axis of movement of the piston member. The pinion member is located inside the piston member in cooperation with the toothing of the piston member so that the force transmission moment of the pinion member is at its maximum in a position corresponding to the closed position of the door.

Claims

1. A closing device for urging a pivotally mounted wing member to move relative to a frame from an open position toward a closed position, said closing device including:

a cylinder body member,

a piston member movable back and forth along a displacement axis defined by the cylinder body member, the piston member having an interior cavity and a toothing at an inner surface of said interior cavity, the toothing having a substantially linear rolling curve which is inclined relative to said displacement axis,

a spring urging the piston member in one direction along said displacement axis,

a closer shaft for transmitting force to the wing member to bring about pivotal movement thereof,

a pinion member connected to the closer shaft, the pinion member being located in the interior cavity of the piston member and meshing with the toothing of the piston member, and the pinion member having a rolling curve which has at least substantially the form of a circle or a circular arc and is eccentric relative to the closer shaft,

whereby the piston member acts on the closer shaft through a lever arm which is at a maximum when the wing member is in its closed position and decreases as the wing member is moved toward its open position.

2. A closing device according to claim 1, wherein the rolling curve of the toothing in the piston member is inclined to the axis of movement of the piston member at an angle in the range 4.5-7.2°

.

3. A closing device according to claim 1, wherein the rolling curve of the toothing in the piston member is inclined to the axis of movement of the piston member at an angle in the range 4.5-6.5°

.

4. A closing device according to claim 3, wherein the rolling curve of the toothing in the piston member is inclined to the axis of movement of the piston member at an angle in the range 5.5-6.2°

.

5. A closing device according to claim 1, wherein the rolling curve of the toothing in the piston member is inclined to the axis of movement of the piston member at an angle in the range 6.5-7.2°

.