Retracting cutter

• US 5,208,983 A
• Filed: 08/19/1991
• Issued: 05/11/1993
• Est. Priority Date: 08/19/1991
• Status: Expired due to Fees

• Current Assignee: Joseph H. Masse
• Original Assignee: Joseph H. Masse
• Inventors: Masse, Joseph H.
• Primary Examiner(s): Watts, Douglas D.
• Assistant Examiner(s): HEYRANA, PAUL
• Application Number:
  US07/746,997
• Time in Patent Office: 631 Days
• Field of Search: 30/340, 30/302, 30/343, 30/344, 30/345, 30/162, 30/136, 30/169, 30/173, 7/900
• US Class Current: 30/340
• CPC Class Codes: A61B 17/3211 Surgical scalpels, knives; Accessories therefor
• CPC Class Codes: A61B 2017/32113 with extendable or retractable guard or blade
• CPC Class Codes: B26B 3/00 Hand knives with fixed blades handles, attaching the handles B25G
• CPC Class Codes: B26B 5/00 Hand knives with one or more detachable blades
• CPC Class Codes: Y10S 7/90 Resilient pivot

Abstract

A knife is disclosed having a self-retracting, adjustable blade. The handle of the knife has two pieces which when compressed expose the blade for use.

Claims

1. An adjustable self-retracting instrument comprising:

(a) a primary functional cutting section of said instrument;

(b) a first curved leg having upper and lower ends, said section being located at the lower end of said first leg; and

(c) a second shorter less curved leg having upper and lower ends, wherein at least one leg is made from a resilient material, said second leg being attached to said first leg at the upper end and resting against said section, whereby when said legs are compressed together said section extends beyond said lower end of said second leg for use.

2. The instrument of claim 1 further comprising:

(d) a slot located at said lower end of said second shorter leg.

3. The instrument as recited in claim 1 wherein said second leg is rigid.

4. The instrument as recited in claim 3 wherein said legs are formed from a common material wherein said rigid leg is thicker than said resilient leg.

5. The instrument as recited in claim 3 wherein said rigid leg is made from a material chosen from the group consisting of metal, plastic or ceramic.

6. The instrument as recited in claim 1 wherein said second leg is straight.

7. The instrument as recited in claim 1 wherein said instrument is a utility knife.

8. The instrument as recited in claim 1 wherein said knife is a scalpel.

9. The instrument as recited in claim 8 wherein said scalpel is made from stainless steel.

10. The instrument as recited in claim 1 wherein at least one leg is textured.

11. The instrument as recited in claim 1 wherein said lower ends of said legs are angled to facilitate holding at an angle.

12. The instrument as recited in claim 1 wherein said resilient material is chosen from the group consisting of steel, brass, aluminium and plastics.

13. The instrument as recited in claim 1, further comprising:

(d) a means of attaching a blade.

14. The instrument as recited in claim 13 wherein said means is chosen from the group consisting of cement, screws, tabs, tension holder and molding.

15. The instrument as recited in claim 13 wherein the segment of said first leg resting against said blade is straight.

16. The instrument as recited in claim 13 further comprising:

(e) an aperture in said second leg, wherein said means of attaching said blade to said first leg is a screw accessible via said aperture.

17. The instrument as recited in claim 1 wherein said cutting section is integral with said first leg.

18. The instrument as recited in claim 17 wherein said instrument is formed from one piece of material.

19. The instrument as recited in claim 17 wherein said first leg is made from metal and the area of said blade is heat treated.

20. The instrument as recited in claim 1 wherein the ratio of displacement of said first leg when compressed to resultant displacement of said cutting section is between 5:

1 and 3;

1.

21. The instrument as recited in claim 1, further comprising:

(d) a means for controlling instrument displacement by limiting displacement of said leg.

22. The instrument as recited in claim 21 wherein said means of control is chosen from the group consisting of clips and screws.

23. The instrument as recited in claim 1 further comprising:

(d) a roller located on the unattached end of said second shorter leg.

24. The instrument as recited in claim 1 further comprising:

(d) a second instrument.

25. The instrument as recited in claim 24 wherein said second instrument is chosen from the group comprising card holders, paper clips, book marks, money clips and tweezers.