Hood release latch mechanism including spring clutch means

• US 5,431,460 A
• Filed: 03/07/1994
• Issued: 07/11/1995
• Est. Priority Date: 03/07/1994
• Status: Expired due to Fees

• Current Assignee: Orscheln Co.
• Original Assignee: Orscheln Co.
• Inventors: Hass, Tave, Heimann, Robert L., Soucie, Wayne L.
• Primary Examiner(s): Lindsey, Rodney M.
• Application Number:
  US08/206,148
• Time in Patent Office: 491 Days
• Field of Search: 292/216, 292/DIG. 14, 292/341.17, 292/DIG. 61, 292/DIG. 43
• US Class Current: 292/216
• CPC Class Codes: E05B 15/04 Spring arrangements in locks E05B3/065, E05B15/101, E05B15/143, E05C19/06 take precedence
• CPC Class Codes: E05B 17/0037 Spring-operated
• CPC Class Codes: E05B 83/16 Locks for luggage compartments, car boot lids or car bonnets
• CPC Class Codes: Y10S 292/14 Hood latches
• CPC Class Codes: Y10S 292/61 Spring devices
• CPC Class Codes: Y10T 292/1047 Closure

Abstract

A latching mechanism includes a latch member pivotally connected with a mounting bracket for movement between latched and released positions, together with a spring clutch device that normally permits pivotal movement of the latch member toward the latched position. The latch member includes a cam surface that is operable by a striker member to displace the latch member from the released position to the latched position as the striker member is displaced toward the mounting bracket (for example, during the closure movement of a hood component to which the striker member is attached). A release device serves to operate the spring clutch to a released condition, whereupon the latch member is spring-biased toward the released position, thereby to unlock the striker member from the mounting bracket.

Claims

1. Latch apparatus for releasably connecting together a pair of relatively movable components such as the hood and frame components of a motor vehicle, comprising:

(a) a mounting bracket adapted for mounting on one of said components;

(b) a striker member adapted for mounting on the other of said components adjacent said mounting bracket;

(c) a latch member pivotally connected with said mounting bracket for pivotal displacement between latched and released positions relative to said mounting bracket, said striker member being generally parallel with the pivot axis of said latch member;

(d) latch spring means normally biasing said latch member toward said released position;

(e) spring clutch means connected between said latch member and said mounting bracket, said spring clutch means normally having a first condition permitting pivotal movement of said latch member in the direction from said released position toward said latched position while simultaneously preventing pivotal movement of said latch member in the opposite direction, said clutch spring means including;

(1) a cylindrical clutch drum connected at one end with said latch member, said clutch drum having a longitudinal axis parallel with said latch member pivot axis;

(2) a helical clutch spring arranged concentrically about said clutch drum and including a plurality of helical turns normally biased radially inwardly into frictional engagement with the periphery of said drum, said turns extending in a direction to permit pivotal movement of said latch member toward said latched position, but to prevent movement of said latch member in the opposite direction toward said released position, said clutch spring having a pair of ends; and

(3) means connecting a first one of said clutch spring ends with said mounting bracket;

(f) cam means operable by said striker member during movement thereof toward said mounting bracket when said latch member is in said released position and said spring clutch means is in said normal first condition for pivoting said latch member toward said latched position, said latch member containing a locking recess for receiving said striker member when said latch member is in the fully latched position, thereby to lock said striker member to said mounting bracket; and

(g) release means cooperating with the other end of said clutch spring for operating said spring clutch means from said first condition to a released condition in which said clutch drum and said latch member are released for pivotal displacement by said latch spring means toward said released position, thereby to unlock said striker member from said mounting bracket.

2. Apparatus as defined in claim 1, and further including first fastening means for fastening said mounting bracket to one component of the vehicle, and second fastening means for fastening said striker member to the other vehicle component.

3. Apparatus as defined in claim 1, wherein said release means comprises means for expanding the turns of said helical clutch spring relative to said clutch drum, thereby to release said clutch drum and said latch member for pivotal movement in the direction from said latched position toward said released position.

4. Apparatus as defined in claim 3, wherein said means for connecting said clutch spring first end with said mounting bracket includes an anchor drum colinearly arranged end-to-end relative to said clutch drum, the end of said anchor drum remote from said clutch drum being non-rotationally connected with said mounting bracket, said helical clutch spring first end being concentrically arranged about, and in continuous frictional engagement with the peripheral surface of, said anchor drum.

5. Apparatus as defined in claim 4, wherein said clutch spring other end includes a generally tangentially extending linear end extension;

and further wherein said release means includes means for displacing said end extension in a direction to expand the adjacent clutch spring turns.

6. Apparatus as defined in claim 1, wherein said latch member contains a cam surface defining said cam means.

7. Apparatus as defined in claim 6, wherein said latch member includes a catch projection adjacent said cam surface, said catch projection defining said locking recess and being so arranged that said striker member enters said locking recess when said latch member is pivoted to the fully latched position.