Spinners knife

• US 3,906,627 A
• Filed: 10/03/1974
• Issued: 09/23/1975
• Est. Priority Date: 10/03/1974
• Status: Expired due to Term

• Current Assignee: Robert E. Manning
• Original Assignee: Robert E. Manning
• Inventors: Manning, Robert E.
• Primary Examiner(s): Smith, Al Lawrence
• Assistant Examiner(s): Zatarga, J. T.
• Application Number:
  US05/508,083
• Time in Patent Office: 355 Days
• Field of Search: 30/162,320,335
• US Class Current: 30/162
• CPC Class Codes: B26B 5/003 comprising retraction means for the blade or the blade holder

Abstract

An improved blade control thumb knob for a knife with a directly retractable spring-loaded blade that is normally encased within the handle portion, the knife blade having an aperture for engaging yarns, threads, and the like. To effect a severing, the user engages a blade connected projection with his thumb, pushes the blade into operative position, performs the severing operation, and then releases the projection allowing the blade to snap back within the handle.

Claims

1. In a safety knife having 1. a hollow handle;

2. a guiding channel formed in the handle;

3. a blade holder securing a knife blade, the holder being mounted to slide in the channel between an extended position and a retracted position; and

4. a spring attached between the holder and the handle for biasing the holder in its retracted position;

an improved blade control thumb knob attached to the blade holder, comprising;

a. an axial beam having a '"'"''"'"''"'"''"'"'T'"'"''"'"''"'"''"'"' shaped cross section and front and rear ends, the beam'"'"''"'"'s top corresponding to the top of the '"'"''"'"''"'"''"'"'T'"'"''"'"''"'"''"'"', the beam'"'"''"'"'s depending height corresponding to the length of the vertical portion of the '"'"''"'"''"'"''"'"'T'"'"''"'"''"'"''"'"'; and

b. an '"'"''"'"''"'"''"'"'L'"'"''"'"''"'"''"'"' shaped thumb rest portion integral with the beam and projecting upward from the beam'"'"''"'"'s top, the extent of the thumbrest'"'"''"'"'s projection tapering concavely from a height at the beam'"'"''"'"'s front end approximately equal to the beam'"'"''"'"'s axial length to a height at the beam'"'"''"'"'s rear end slightly less than one-half the beam'"'"''"'"'s depending height.

2. a guiding channel formed in the handle;

3. a blade holder securing a knife blade, the holder being mounted to slide in the channel between an extended position and a retracted position;

and

4. a spring attached between the holder and the handle for biasing the holder in its retracted position;

an improved blade control thumb knob attached to the blade holder, comprising;

a. an axial beam having a '"'"''"'"''"'"''"'"'T'"'"''"'"''"'"''"'"' shaped cross section and front and rear ends, the beam'"'"''"'"'s top corresponding to the top of the '"'"''"'"''"'"''"'"'T'"'"''"'"''"'"''"'"', the beam'"'"''"'"'s depending height corresponding to the length of the vertical portion of the '"'"''"'"''"'"''"'"'T'"'"''"'"''"'"''"'"'; and

b. an '"'"''"'"''"'"''"'"'L'"'"''"'"''"'"''"'"' shaped thumb rest portion integral with the beam and projecting upward from the beam'"'"''"'"'s top, the extent of the thumbrest'"'"''"'"'s projection tapering concavely from a height at the beam'"'"''"'"'s front end approximately equal to the beam'"'"''"'"'s axial length to a height at the beam'"'"''"'"'s rear end slightly less than one-half the beam'"'"''"'"'s depending height.