Gravity lockable tongs

• US 6,092,847 A
• Filed: 05/12/1999
• Issued: 07/25/2000
• Est. Priority Date: 05/12/1999
• Status: Expired due to Fees

• Current Assignee: Merry Chance Industries Limited
• Original Assignee: Merry Chance Industries Limited
• Inventors: Kwan, Steven Chi Fai
• Primary Examiner(s): Kramer, Dean J.
• Application Number:
  US09/310,292
• Time in Patent Office: 440 Days
• Field of Search: 294/3, 294/8.5, 294/11, 294/16, 294/28, 294/33, 294/99.2, 294/100, 294/110.1, 294/106
• US Class Current: 294/16
• CPC Class Codes: A47G 21/10 Sugar tongs; Asparagus tongs; Other food tongs
• CPC Class Codes: A47J 43/283 Tongs; Devices for picking, holding or rotating food

Abstract

A set of locking tongs comprising a first arm and a second arm each comprising a hinge end and a grasping end. Hinge members are provided for pivotably connecting the first and second arms together at the hinge ends, so that the arms can pivot between an open position and closed position. Spring members are included for biasing the arms in an open position. The locking member comprises a captured pin attached to the first arm and an aperture member attached to the second arm. The captured pin has a pin that moves under the effects of gravity within a contained range of motion, limited by a bracket. The second arm has an aperture located on a surface. When the tongs are held in an attitude such that gravity can act upon the pin, the pin will engage the aperture and prevent the tongs from opening. The outward force applied by the spring acts to retain the pin in its locked position through frictional forces thus resisting opening. When the arms are depressed thereby relieving the force felt by the sides of the pin against the aperture, and oriented such that the pin can move under the affect gravity, the lock may be disengaged.

Claims

1. Gravity lockable tongs for grasping items comprising:

a first arm and a second arm each comprising a hinge end and a grasping end;

hinge means for pivotably connecting said first and second arms together at the respective hinge ends, so that the arms can pivot between an open position and closed position;

spring means cooperating with the first arm and the second arm for biasing the arms in an open position;

gravity locking means comprising a captured pin means attached to the first arm and an aperture means attached to the second arm whereby the captured pin means comprises;

a pin means slideable under the force of gravity, the pin means aligned substantially parallel with the first arm;

and a containment means for allowing limited sliding motion of the pin means;

and the aperture means comprises an engagement area where the slideable pin means may cause the gravity locking means to be engaged

whereby the gravity locking means is disengageable when oriented such that gravity causes the gravity locking means to remain disengaged, and engageable when oriented such that gravity causes the gravity locking means to become engaged.

2. The lockable tongs of claim 1 wherein the locking means is engaged by applying force to the arms such that the grasping ends are in close proximity to each other while the tongs are oriented such that the slidable pin is moved by gravity to engage the locking means.

3. The lockable tongs of claim 1 wherein the locking means is disengaged by depressing the arms such that the grasping ends are in close proximity to each other while the tongs are oriented such that the slidable pin is moved by gravity to disengage the locking means.

4. The lockable tongs of claim 1 wherein the containment means comprises a C-shaped bracket having a first bracket leg, a base, and a second bracket leg.

5. The lockable tongs of claim 4 wherein the first bracket leg and the second bracket leg of the C-shaped bracket further comprises aperture means for locating the pin means therethrough.

6. The lockable tongs of claim 5 wherein the pin means comprises a pin member with a first pin end and a second pin end and a middle region, the middle region having increased diameter for a portion located between the pin ends.

7. The lockable tongs of claim 6 where the middle region of the pin member is contained between the first and second bracket legs with the pin ends extending through the apertures means of the first and second bracket legs.

8. The lockable tongs of claim 7 wherein the tongs are operable for a limited range of motion from the open to near closed position when the pin means is engageable.

9. The lockable tongs of claim 1 wherein the tongs are operable throughout the full range of motion when the pin means is disengageable.

10. The lockable tongs of claim 1 wherein the tongs are made of stainless steel.

11. The lockable tongs of claim 1 wherein the tongs are made of plastic.