Door latch actuating mechanism

• US 4,925,222 A
• Filed: 08/29/1988
• Issued: 05/15/1990
• Est. Priority Date: 08/29/1988
• Status: Expired due to Term

• Current Assignee: Adams Rite Manufacturing Co. (Assa Abloy AB)
• Original Assignee: Adams Rite Manufacturing Co. (Assa Abloy AB)
• Inventors: Loock, Freidrich
• Primary Examiner(s): Smith, Gary L.
• Assistant Examiner(s): MILANO, MICHAEL J
• Application Number:
  US07/237,182
• Time in Patent Office: 624 Days
• Field of Search: 292/336.3, 292/347, 292/169.23 X, 292/337, 292/357, 292/DIG. 61
• US Class Current: 292/336.3
• CPC Class Codes: E05B 3/065 with spring biasing means for moving the handle over a substantial distance, e.g. to its horizontal position
• CPC Class Codes: Y10S 292/61 Spring devices
• CPC Class Codes: Y10T 292/57 Operators with knobs or handles
• CPC Class Codes: Y10T 292/82 Knobs

Abstract

A door latch actuating mechanism comprises: a housing attachable to door structure, a handle carried by the housing for rotation in either of two directions, and an output shaft rotatable in response to handle rotation, and mechanism in the housing to yieldably resist handle rotation in either direction, the mechanism including

(i) a rotor coupled to the handle to rotate therewith,

(ii) a first spring coupled to the rotor to resist rotor rotation in one direction, and

(iii) a second spring coupled to the rotor to resist rotor rotation in the opposite direction.

Claims

1. A door latch actuating mechanism, the combination comprising:

(a) a housing attachable to door structure,

(b) a handle carried by the housing for rotation in either of two directions, and an output shaft rotatable in response to handle rotation,

(c) and mechanism in the housing to yieldably resist handle rotation in either direction, said mechanism including

(i) a rotor coupled to the handle to rotate therewith,

(ii) a first spring coupled to the rotor to resist rotor rotation in one direction, and

(iii) a second spring coupled to the rotor to resist rotor rotation in the opposite direction,

(d) said springs being everywhere spaced apart and coupled to different portions of the rotor, whereby the second spring is inactive when the rotor is rotated in said one direction, and said first spring is inactive when the rotor is rotated in said opposite direction,

(e) the housing being longitudinally elongated, and said springs extending generally longitudinally, in laterally spaced relation in the housing, the housing including a shell, and an insert in the shell mounting said springs and said rotor,

(f) the rotor having an axis and two cam shoulders, and including plungers extending between the ends of the respective springs and said cam shoulders defined by the rotor, the cam shoulders located at opposite sides of the rotor axis,

(g) there being longitudinally extending stepped guides on the insert to guide each plunger as it is moved longitudinally relative to the insert by a cam shoulder, that plunger having elongated guiding extent between its associated cam shoulder and spring.

2. The combination of claim 1 wherein said springs are compression type coil springs extending linearly away from the rotor, in the housing.

3. The combination of claim 1 wherein the shell is metallic and said insert consists of molded plastic material.

4. The combination of claim 3 wherein said handle is metallic, and said handle and shell have anodized outer surfaces.

5. The combination of claim 3 wherein the shell is channel shaped, and the shell and insert are longitudinally elongated.

6. The combination of claim 3 wherein the shell is anodized and is frictionally retained to the insert.

7. The combination of claim 3 including a channel shaped metallic bracket within which the insert is received, the bracket and insert both frictionally retained within the shell, the insert consisting of molded plastic material.

8. The combination of claim 7 wherein the insert and bracket define openings to pass fasteners for fastening to a door, the fasteners concealed within the shell, the shell removable off the handle.

9. The combination of claim 7 wherein the shell has an open side and including an anodizable trim plate loosely covering such shell open side to conceal the bracket and insert in the shell, the shell removable off the bracket while retained on the handle.