Hand tool with changeable blade

• US 20030019110A1
• Filed: 07/24/2002
• Published: 01/30/2003
• Est. Priority Date: 07/24/2001
• Status: Active Grant

• Current Assignee: Puma-Werk Lauterjung & Sohn GmbH Co. KG Schneidwarenmanufaktur
• Original Assignee: Puma-Werk Lauterjung & Sohn GmbH Co. KG Schneidwarenmanufaktur
• Inventors: Knoop, Heinz-Peter
• Granted Patent: US 6,701,626 B2
• Time in Patent Office: Days
• US Class Current: 30/337
• CPC Class Codes: B23D 51/01 characterised by the handle
• CPC Class Codes: B23D 51/10 for hand-held or hand-operated devices
• CPC Class Codes: B25G 3/14 comprising barbs or teeth
• CPC Class Codes: B25G 3/22 Chucks
• CPC Class Codes: B26B 1/10 Handles
• CPC Class Codes: B26B 5/00 Hand knives with one or more detachable blades

Abstract

A hand tool has an elongated blade having a longitudinally inwardly projecting tang having a longitudinal back edge formed with a plurality of transversely directed teeth, a longitudinal front edge, and an elastically transversely deflectable retaining formation. A handle forms a longitudinally open seat having one longitudinally extending side wall. A retaining lever has an edge formed with teeth and an elastically transversely deflectable retaining formation. The lever is displaceable between a closed holding position with the lever teeth meshing with the blade teeth and pressing the blade against the seat wall and the formation transversely engaging and bearing elastically against the blade retaining formation, and an open freeing position with the lever teeth out of mesh with the blade teeth and the formation out of engagement with the blade retaining formation.

Claims

1. A hand tool comprising:

an elongated blade having a longitudinally inwardly projecting tang having

a longitudinal back edge formed with a plurality of transversely directed teeth,

a longitudinal front edge, and

an elastically transversely deflectable retaining formation;

a handle part forming a longitudinally open seat having one longitudinally extending side wall;

a retaining lever having an edge formed with teeth and an elastically transversely deflectable retaining formation, the lever being displaceable between

a closed holding position with the lever teeth meshing with the blade teeth, pressing the blade against the seat wall, and with the formation transversely engaging and bearing elastically against the blade retaining formation, and

an open freeing position with the lever teeth out of mesh with the blade teeth and the formation out of engagement with the blade retaining formation.

2. The hand tool defined in claim 1 wherein the retaining formation of the blade is at an inner end of the tang.

3. The hand tool defined in claim 1 wherein the tang and blade lie in a longitudinal plane and the retaining formation of the blade is bent at an acute angle out of the plane.

4. The hand tool defined in claim 1 wherein the retaining formations have flat faces flatly engaging each other in the closed holding position.

5. The hand tool defined in claim 1 wherein the tang tapers away from the blade.

6. The hand tool defined in claim 1 wherein the teeth of the retaining lever fit complementarily in the closed holding position with the teeth of the tang.

7. The hand tool defined in claim 1 wherein the handle has a transversely extending structure spaced from the side wall, the tang being snugly engaged between the side wall and the structure when inserted in the seat.

8. The hand tool defined in claim 7 wherein the structure is a crosswise pin.

9. The hand tool defined in claim 1 wherein the blade has a transversely projecting finger shield.

10. The hand tool defined in claim 9 wherein the finger shield, blade, and tang are unitarily formed.