Hand-operated ratchet cutter

Abstract

A hand-operated ratchet cutter with a movable and a fixed handle, wherein the fixed handle forms a first fixed blade, and a movable blade is hinged to an upper end area of the fixed blade, for shearing interaction in a cutting plane with the fixed blade. The movable blade moves in a plane parallel to the cutting plane, and the fixed blade has a first flat side. A fixed jaw with a second flat side (21) facing the first flat side is formed that also extends up to the upper end area of the fixed blade. A passage slot for the movable blade adjusted to the thickness (d) is formed between the first and second flat side, so as to ensure the shearing interaction between the movable and fixed blade even under a load by having the jaw act as a supporting jaw.

Claims

1. A hand-operated ratchet cutter, comprising: a movable handle having a movable blade with a constant thickness in its direction of movement, and a fixed handle that forms a first fixed blade with a first flat side facing the movable blade and a fixed jaw with a second flat side faxing the first flat side, the fixed jaw extending up to an upper end area of the first fixed blade and opposite to the first fixed blade relative to a cutting plane, wherein the movable blade is hinged to the upper end area of the fixed blade and is movable in a plane parallel to the cutting plane for shearing interaction in the cutting plane with the fixed blade, wherein a passage slot for the movable blade adjusted to the thickness of the movable blade is formed between the first flat side and the second flat side, so as to ensure the shearing interaction between the movable blade and the fixed blade even under a load, such that the fixed jaw acts as a supporting jaw, wherein the fixed jaw forms a supporting shoulder that is aligned perpendicular to the cutting plane and is arranged downstream of the cutting blade in a pivoting direction of the movable blade.

2. The hand-operated ratchet cutter according to claim 1, wherein only three parts lying one over the other perpendicular to the pivoting direction of the movable blade are provided in the area of the passage slot, including the movable blade, in a thickness direction of the movable blade.

3. The hand-operated ratchet cutter according to claim 1, wherein flat sections of the first and second flat sides are located one over the other and provide the passage slot for the movable blade, wherein the movable blade is configured to pass completely through the passage slot, and wherein an overlapping area of the flat sections has a decreasing dimension and tapers from a lower end of the fixed blade and fixed jaw toward the pivot axis.

4. The hand-operated ratchet cutter according to claim 1, wherein the thickness of the fixed jaw as viewed in the direction of the pivoting axis of the movable blade is 1 to 2 times the thickness of the fixed blade in the area of the passage slot and/or 1 to 2 times the thickness of the movable blade.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention is explained below based on the attached drawing, which only represents an exemplary embodiment. The drawing shows:

(2) FIG. 1 A perspective view of a ratchet cutter of the kind in question;

(3) FIG. 2 The ratchet cutter in elevation view;

(4) FIG. 3 A rear view of the ratchet cutter relative to the illustration on FIG. 2;

(5) FIG. 4 A perspective, exploded view of the ratchet cutter;

(6) FIG. 5 The section according to line V-V on FIG. 2;

(7) FIG. 6 A cutout from the elevation view according to FIG. 2, relating to a schematic illustration of an overlapping surface.

DESCRIPTION OF THE EMBODIMENTS

(8) Illustrated and described initially with respect to FIG. 1 is a hand-operated ratchet cutter 1 in the form of a cable cutter. The latter has two handles, specifically first a fixed handle 2 and a movable handle 3.

(9) The fixed handle 2 forms a bearing plate 4, proceeding from which a fixed blade 5 is shaped like an arc with a concavely running cutting edge 6.

(10) The upper end area 7 of the fixed blade 5 forms a pivot bearing 8 with a geometric pivot axis x for mounting a movable blade 9 shaped like a circular section with a cutting edge 10.

(11) The movable blade 9 is movable in a parallel plane to the fixed blade 5, wherein the facing flat sides 11 of the fixed blade 5 and the flat side of the movable blade 9 glide along each other during a cutting process. A cutting plane E aligned transverse to the pivot axis x here arises.

(12) The cutting edge 10 of the movable blade 9 proceeds from the pivot axis 8 and runs along an arc, highly concave, transitioning into a slightly convex area and finally into another less strongly concave area until into a free end area 12. The outer periphery of the movable blade 9 is equipped with a tooth system 13 or designed as a tooth segment.

(13) A ratchet mechanism having a feed lever 14 and a locking lever 15 engages into the tooth system 13.

(14) Reference is made to the EP 0 468 196 B1 mentioned at the outset with regard to the further structural design and function of the ratchet mechanism. The content of this patent specification is hereby completely included in the disclosure of the present invention, also for purposes of including features of this patent specification in claims of the present invention.

(15) The movable handle 3 is mounted on a trunnion pin 17 in the area of the bearing plate 4. A spiral spring 18 arranged between the movable handle 3 and fixed handle 2 always tries to push the handles into the open position, in which both handles are spread apart.

(16) The feed lever 14, locking lever 15, along with additional functional parts of the ratchet mechanism 16 along with a latching lever 19 and the movable blade 9 are in a shared plane, all preferably have the same thickness and are covered by a fixed jaw 20 in the form of a supporting jaw. This yields a very flat sandwich construction essentially comprised of three planes. The first plane forms the bearing plate 4 with the fixed blade extending from it. The second plane consists of the aforementioned equally thick individual parts, in particular the ratchet mechanism 16 and movable blade 9.

(17) Finally, the third plane forms the fixed jaw 20. In an elevation view according to FIG. 2, which illustrates the pivot axis x with points, an overall arc-shaped extension proceeding from the connecting region on the bearing plate 4 arises relative to the fixed jaw 20, and runs all the way into the area of the pivot axis x, in whose upper end area the fixed jaw 20 and fixed blade 5 form the pivot bearing 8. A pin 21 that pivotably holds the movable blade 9 is thereby preferably retained in the respective upper end area of the fixed blade 5 as well as the fixed jaw 20. This yields a stable pivot bearing formation.

(18) The flat side 21 of the fixed jaw 20 facing toward the movable blade 9 is runs parallel to the cutting plane E, and during the pivoting displacement of the movable blade 9 abuts against the facing flat side of the movable blade 9.

(19) This yields a passage slot 20 between the flat sides 11 and 21 of the fixed blade 5 and the fixed jaw 20 for the movable blade 9.

(20) The width b of the passage slot 22 viewed in the direction of extension of the pivot axis x is essentially adjusted to the thickness d of the movable blade 9 penetrating through the passage slot 22 as viewed in the same direction, wherein the movable blade 9 further preferably has a constant thickness d.

(21) As also illustrated, the thickness d of the jaw can further correspond to about 1.5 to 2 times the thickness d of the movable blade 9 and/or the thickness d of the fixed blade 5 (see FIG. 5).

(22) Obtained in the pivoting direction a of the movable blade 9 during a cutting process with reference to a perpendicular projection toward the pivot axis x, for example as shown on FIG. 2, is a downstream arrangement of a supporting shoulder 24 of the fixed jaw 20 relative to the cutting edge of the fixed blade 5, said supporting shoulder being essentially aligned perpendicular to the cutting plane E and facing toward the cutting eye 23.

(23) The arrangement is further selected in such a way that, in such a projection, the flat sections of the fixed blade 5 and fixed jaw lying one over the other in the direction of the pivot axis x form a shared projected overlapping surface U, in particular in the area of the passage slot 22, which tapers essentially proceeding from the bearing plate area, correspondingly proceeding from the area of the passage slot 22 initially passed through during the pivoting movement of the movable blade 9 toward the upper end area 7, essentially with a decreasing radius relative to the pivot axis x. According to the schematic illustration on FIG. 6, this yields an overlapping surface U that tapers like a sickle proceeding from the bearing plate 4 (see also tapering radius dimension r1 to r3 on FIG. 6).

(24) During the sickle-like extension of the overlapping surface U, the radial extension (radius dimension r1 to r3) can in this way uniformly decrease.

(25) The overlapping surface U can run through a minimum near the upper end area 7 with respect to the radial extension, so as to thereafter once again run out into an enlarged overlapping area by comparison to the minimum in the area enveloping the pivot bearing 8 (see FIG. 6).

(26) The above statements serve to explain the inventions encompassed by the invention overall, which further develop the prior art at least via the following feature combinations, each separately as well, wherein two, several or all of these feature combinations can also be combined, specifically:

(27) A hand-operated ratchet cutter, characterized in that a passage slot 22 adjusted to the thickness d is formed between the first 11 and second 21 flat side, so that the jaw 20 acting as a supporting jaw ensures the shearing interaction between the movable 9 and fixed 5 blade, even under a load.

(28) A hand-operated ratchet cutter, characterized in that only three parts perpendicular to the pivoting direction a of the movable blade 9 are provided one over the other in the thickness direction of the movable blade 9 in the area of the passage slot 22, including the movable blade 9.

(29) A hand-operated ratchet cutter, characterized in that, given a perpendicular projection toward a pivot axis x of the movable blade 9, flat sections of the first and second flat sides 11, 21 located one over the other and, with the movable blade 9 passing completely through the passage slot 22 in the mentioned projection coming to overlap the movable blade 9, can initially decrease given a decreasing radius dimension of the movable blade 9.

(30) A hand-operated ratchet cutter, characterized in that the thickness d of the fixed jaw as viewed in the direction of the pivot axis x of the movable blade 9 in the area of the passage slot 22 corresponds to 1 to 2 times the thickness d of the fixed blade 5 in the area of the passage slot 22 and/or 1 to 2 times the thickness d of the movable blade 9.

(31) All disclosed features (taken separately but also in combination with each other) are essential to the invention. The disclosure of the application hereby incorporates in its entirety the disclosed content of the accompanying/attached priority documents (copy of preliminary application), also for the purpose of including features in these documents into claims of the present invention. The features in the subclaims characterize independent inventive further developments of prior art, in particular so as to initiate partial applications based upon these claims.

(32) TABLE-US-00001 Reference List 1 Ratchet cutter 2 Fixed handle 3 Movable handle 4 Bearing plate 5 Fixed blade 6 Cutting edge 7 End area 8 Pivot bearing 9 Movable blade 10 Cutting edge 11 Flat side 12 End area 13 Tooth system 14 Feed lever 15 Locking lever 16 Ratchet mechanism 17 Trunnion pin 18 Spiral spring 19 Latching lever 20 Fixed jaw 21 Flat side 22 Passage slot 23 Cutting eye 24 Supporting shoulder a Pivoting direction b Width d Thickness d Thickness d Thickness x Pivot axis E Cutting plane U Overlapping surface r1 Radius dimension r2 Radius dimension r3 Radius dimension