Scissors with cushioned stop

• US 4,407,069 A
• Filed: 12/08/1981
• Issued: 10/04/1983
• Est. Priority Date: 12/08/1981
• Status: Expired due to Fees

• Current Assignee: The Scott Fetzer Company (Berkshire Hathaway Incorporated)
• Original Assignee: Scott and Fetzer Co (Berkshire Hathaway Incorporated)
• Inventors: Conners, John A.
• Primary Examiner(s): Peters, Jimmy C.
• Application Number:
  US06/328,651
• Time in Patent Office: 665 Days
• Field of Search: 30/271, 30/254, 30/341
• US Class Current: 30/254
• CPC Class Codes: A61B 17/3201 Scissors for biopsy A61B10/02
• CPC Class Codes: A61B 2090/033 Abutting means, stops, e.g. abutting on tissue or skin
• CPC Class Codes: B26B 13/00 Hand shears; Scissors

Abstract

First and second metal blades made from uniform thickness stock are fashioned into scissors which may be disposable suture scissors. Each of the blades is stamped from sheet metal, they are pivoted together, and handles extend in the opposite direction from cutting edges on the blades. Resilient means is provided by the handles being resilient and stop means are provided to limit the closed position of the cutting edges to prevent overriding, namely overclosing, of the cutting edges. The stop means includes first and second stop surfaces integral with the first and second blades, respectively. The stop surfaces are close to the pivot relative to the length of the handles, the blades have only frictional opposition to movement until the stop surfaces engage, and then the subsequent stressing of the resilient means establishes a cushioned stop of movement of the handles without any further movement of the cutting edges past the fully closed condition. The foregoing abstract is merely a resume of one general application, is not a complete discussion of all principles of operation or applications, and is not to be construed as a limitation on the scope of the claimed subject matter.

Claims

1. Scissors comprising, in combination:

first and second blades made from flat stock of substantially uniform thickness and each having a cutting edge and an inner side surface;

pivot means acting between said blades and establishing a pivot axis for the blades for cutting cooperation of said cutting edges by sliding past one another substantially parallel to said inner side surfaces;

a handle on the end of each blade opposite the respective cutting edge;

stop means establishing the closed position of the scissors;

said stop means including a first stop surface unitary with said first blade;

a second stop surface unitary with said second blade and abuttable with said first stop surface to limit the closed position of said blades;

a third stop surface unitary with said second blade;

a fourth stop surface unitary with said first blade and abuttable with said third stop surface to limit the closed position of said blades at substantially the same time as abutment between said first and second stop surfaces;

each of said stop surfaces and said entire stop means lying within the thickness of said two blades;

said stop means including at least two shear cuts in said first blade establishing said first stop surface, and a bend in the material of said first blade between said two shear cuts to establish the blade material therebetween bent out of the thickness of said first blade and with said first stop surface at least partially out of the thickness of said first blade;

resilient means including at least one of said handles or said stop means being resilient;

said first and second stop surfaces and said third and fourth stop surfaces being located close to said pivot axis relative to the length of said handles to establish substantially face-to-face abutment therebetween with the cutting edges closed yet the handles still slightly spaced apart and with each cutting edge protected by said inner side surface of the other blade; and

the blades presenting minimal opposition to movement of said handles until said stop surfaces engage and then the subsequent stressing of said resilient means establishing a cushioned stop of movement of said handles.

2. Scissors as set forth in claim 1, wherein said stop means includes a U-shaped tongue lanced from the stock of said first blade with one of the sides of said U-shaped tongue established as said first stop surface.

3. Scissors as set forth in claim 2, wherein the base of said U-shape is said first stop surface.

4. Scissors as set forth in claim 2, wherein said lanced tongue has first and second bends in opposite directions to establish said tongue in a position with said first stop surface substantially entirely out of the thickness of said first blade and yet establish said stop means substantially entirely within the thickness of the scissors.

5. Scissors as set forth in claim 1, wherein at least one of said handles is resilient.

6. Scissors as set forth in claim 1, wherein both of said handles are resilient.

7. Scissors as set forth in claim 1, wherein each of said first and second stop surfaces are substantially perpendicular to the plane of the respective blade.

8. Scissors as set forth in claim 1, wherein each of said first and third stop surfaces are formed as one edge of lanced U-shaped tongues on the respective blades.

9. Scissors as set forth in claim 1, wherein said first and second stop surfaces and said fourth and third stop surfaces are disposed at an angle to the respective first and second blades so that when said first and second stop surfaces are forced together, there is an absence of a component of force generated perpendicular to the plane of the blades in a direction which tends to move said cutting edges away from each other.

10. Scissors as set forth in claim 1, wherein at least one of said blades has a composite handle of a first portion unitary with said cutting edge and a second portion secured to said first portion, and said stop surface on said one of said blades being on said handle first portion.

11. Scissors as set forth in claim 10, wherein the length of said composite handle from said pivot axis is at least five times the distance from said pivot axis to said stop surface on said one of said blades and said handle second portion is resilient to establish said resilient means.

12. Scissors as set forth in claim 11, wherein the precise position of securing said second handle portion to said first handle portion is obviated by said stop means being on said first handle portion rather than on said second handle portion.

13. Scissors as set forth in claim 1, wherein said handles are spaced apart in the order of 0.25 inch when said stop surfaces are initially moved into closing engagement and said resilient means having sufficient resiliency to permit said handles to be forced into mutual engagement and said abutting stop surfaces still preventing overriding of said cutting edges.