No-Tow-Lunette Eye Locking Device Which Prevents Pentel Hook Connection

It is the object of the invention to provide a tamper-resistant locking device which blocks any connecting fit between a pentel hook and a lunette eye. A further object of the invention is to incorporate a one-size-fits-all floating ring to accomodate the three sizes of lunette eye currently in use and effectively block their connection to a pentel hook.

The present invention will be more fully understood by reference to the following detailed description and the drawings of FIG. 1 (two-piece device, connected) , FIG. 2 (cutaway view of upper housing), and FIG. 3 (cutaway view of lower insert).

FIG. 1. View of Exterior of complete device in secured position.

1. Upper housing with coverplate

2. Lower insert with coverplate

3. Floating ring

FIG. 2. Upper housing with floating ring showing internal machined steps for locking dogs.

1. Three views of upper housing

3. Floating ring `12. Machined steps

FIG. 3. Lower insert with coverplate, interior cutaway view showing barrel lock mechanism.

2. Cutaway view of lower insert with coverplate

4. Pre-manufactured barrel lock 3/4" diameter

5. Key for pre-manufactured barrel lock

6. Locking dogs 5/16 " square high carbon steel

7. Allen set screws 8-32.times.3/16"

8. Toggle, machined to fit underside of locking dogs

9. Springs 1/16" diameter (2 each)

10. Through hole 1/16" diameter for lubrication of locking dogs

11. Dog cap to prevent displacement of sliding dogs

FIG. 4. Cross-section of locking device in locked position within 21/2 inch or 23/8 inch lunette eye showing floating ring in uppermost position beneath the coverplate

1. Upper housing-coverplate

2. Lower insert-coverplate

3. Floating ring

FIG. 5. Cross-section of locking device in locked position within a 3 inch lunette eye showing the floating ring centered within the lunette eye.

1. Upper housing-coverplate

2. Lower insert-coverplate

3. Floating ring

The loss-prevention blocking device which fills the hole of the lunette eye includes a two-piece cylinder spool (FIG. 1) having an upper housing with floating ring (FIG. 2) having a thickened portion of the spool forming a bottom collar (13) on which the floating ring (3) will rest in the 3" lunette eye application and lower insert (FIG. 3).

Machined in the lower insert is a keyed, pre-manufactured barrel lock (4) which when the key (5) is turned, activates two locking dogs (6) allowing either retraction (unlocked position) or expansion (locked position) of the locking dogs into machined steps (see cross-section FIG. 2) within the interior of cylinder of upper housing. The pre-manufactured barrel lock (4) is placed and secured into 3/4" machined hole in the lower insert coverplate (FIG. 3, #2) using two 8-32.times.3/16" diameter Allen set screws (7) which fit into tapped holes fitting positively. A machined toggle (8) fits between the underside of locking dogs and the pre-manufactured barrel lock. The barrel lock key (5) moves clockwise or counter-clockwise, retracting (unlocked) or expanding (locked) the sliding locking dogs (6). By use of two 1/16" springs(9) outward pressure is maintained on the locking dogs keeping them fitted into machined steps and locked position until movement is directed with the key to the unlocked position for removal from upper housing. A 1/16" through hole (10) placed in dog cap (11) which holds locking dogs in place allows for lubrication of moveable locking dogs.

Upper housing (FIG. 2) with coverplate (1) and floating plate (3)is machined with two interior steps (12) to accept the lower insert. As lower insert is inserted, the locking dogs reach the stepped positions determined by the size of the lunette eye on which the device is being used, and expand to the wall of the upper housing (1) securing the device from separation. The two-fold purpose of the 1/8" thick floating ring (3)around the cylinder body of upper housing is to center the body withing the 3" lunette eye as floating ring (3) rests on collar (13) and when used on the smaller size lunette eye (23/8" or 21/2") the ring will slide to the uppermost position beneath the coverplate (see FIG. 4).

FIG. 1 is the exterior of complete two-piece device with foating ring shown in a closed, secured position.