EP0335863B1

EP0335863B1 - Blade shears with relative sliding

Info

Publication number: EP0335863B1
Application number: EP87905961A
Authority: EP
Inventors: Enzo Alessandro Bet
Original assignee: Individual
Current assignee: Individual
Priority date: 1986-12-12
Filing date: 1987-09-08
Publication date: 1990-08-22
Also published as: EP0335863A1; AU7914287A; WO1988004223A1; IT1216406B; IT8683452A0

Abstract

Scissor-type shears composed of two parts hinged at an intermediate point (3) of new version lever (1, 2) with function of leverage and blades (1'', 2'') having the function of resistance, in which the respective blades (1'', 2'') present the cutting edge misaligned with the respective rotation pin.

Description

The subject of this invention is a blade rectilinear shear with relative slide of the blades against each other.
Shears with cutting blades with relative slide of the blades against each other are already known in the present state of art. However, they are of a specific type and have essentially pruning functions in agriculture (FR-A-966992 WEILAND). In FR-A 966992 both the cutting edges are misaligned with the respective rotation pin, but only one cutting edge is misaligned with the respective force lever line and only one lever is Z-shaped, this solution do not allowing cutting plates and foils or sheets easy, because this is obliged to flect in cutting operation.
The scope of this invention is to realize cutting shears which integrate the function of the traditional shears and which are able to carry out a cutting function that traditional shears are unable to do, particularly for the cutting of special materials and, above all, flat parts or cuts in areas of difficult access.
According to the characteristics given in the attached claims, this invention solves the problem by realizing scissor-type shears for rectilinear cuttings, involving two levers hinged at an intermediate point by a rotation pin (3) to realize first version levers (1, 2) with a first portion of a lever being force lever having a function of handles (1', 2') and the second portion of a lever being resistance lever having a cutting function (1", 2"), thus realizing both the cutting edges misaligned with the respective rotation pin, with a cutting edge misaligned with the respective force lever line and a lever Z-shaped, characterized by the fact that:

- both the respective resistance levers (1", 2") present:
- the cutting edges misaligned with the respective force lever line,
- both levers (1, 2) being angled realizing an essentially "Z" shape with each handle (1', 2'), more or less open in form, in orderto configure in cutting operation, two different spaced apart planes, parallel to each other,
- the first being the cutting plane between the cutting blades (1", 2") and
- the other being a shears handling plane, passing between the respective handles in coincidence with hinged intermediate point (3).

A relative slide is thus obtained between the respective cutting blades which favours the shearing action.
Furthermore, the respective cutting edges are conveniently serrated in order to prevent eventual slipping of the product to be cut.
This solution has the advantage of being able to cut materials which are difficult and also of a certain consistency. This is something which would be impossible to do with traditional shears.
Furthermore, the counter blade can be double instead of being single, as in the traditional shears. That is to say, composed of two parallel blades spaced apart by the thickness of the cutting blade so that this can pass closely between them. A safer cutting action is thus obtained as the blade is "guided" between the respective counter blades.
It is convenient that the counter blade is the lower one. It is possible to work better with this solution, for example, to be able to cut sheets without deviations.
The invention is hereafter explained in more detail with the help of the drawings showing the preferential solutions for realization, the execution detail of which are not to be held as limiting but only as examples.
Figure 1 shows one of the possible forms of realization of the shears as per the invention.
Figure 2 schematically shows the shearing system and visualizes an alternative way of cutting by twin counter blades so that the cutting blade may insert itself between them.
As can be seen from the above-mentioned figures, the shears or more properly, the scissors according to the traditional technique are composed of two elements 1, 2 hinged at an intermediate point 3 so as to realize a new version of lever shears in which the handle 1', 2' represents the leverage part whereas the blades 1", 2" represent the resistance as the fulcrum 3 is in an intermediate position.
The innovative characteristic derives from the fact that:

- the respective cutting edge of the respective blades is not oriented radially in respect to the point of rotation but angled in such a way that the cutting action also involves a relative sliding of the respective cutting edges of the same blades;
- the corresponding cutting edges are serrated.

One of the two cutting edges is conveniently realized with saw teeth so as to prevent the cut material being shifted by the relative sliding of the blades in a blunt area. It will be noted that the scissors may conveniently bear a spring for self- opening. A means of hanging up the shears when closed may obviously be foreseen such as, for example, a hook or similar means realized on the respective handles. This means is not illustrated but is easily imaginable.
It will be noted that the "Z" shape thus conceived determines a transmission system of force similar to a man's jaw with the characteristic that the respective blade is angled in respect to the part which connects it to the pivoting point.
It can be noted that the cutting counter blade 2" may also be double, that is to say it realizes a sort of pocket so that the cutting blade 1" passes closely between the pair of counter blades which, for this scope, have the corresponding thickness of the cutting blade between them. In this way the cut will be further assured both for cutting and for an eventual tearing movement.
It will be further noted that if this type of counter blade is not tightly closed, the shears can also act as pincers.

Claims

1. Scissor-type shears for rectilinear cuttings, involving two levers hinged at an intermediate point by a rotation pin (3) to realize first version levers (1, 2) with a first portion of a lever being force lever having a function of handles (1', 2') and the second portion of a lever being resistance lever having a cutting function (1", 2"), thus realizing both the cutting edges mnisaligned with the respective rotation pin, with a cutting edge misaligned with the respective force lever line and a lever Z-shaped, characterized by the fact that:

- both the respective resistance levers (1 ", 2") present:

- the cutting edges misaligned with the respective force lever line,

- both levers (1, 2) being angled realizing an essentially "Z" shape with each handle (1', 2'), more or less open in form, in order to configure in cutting operation, two different spaced apart planes, parallel to each other,

- the first being the cutting plane between the cutting blades (1", 2") and

- the other being a shears handling plane, passing between the respective handles in coincidence with hinged intermediate point (3).

2. Shears, as per claim 1, characterized by the fact that both the respective cutting edges of the scissor-working blades (1 ", 2") are toothed.

3. Shears, as per claim 1, characterized by the fact that at least one ofthe two cutting edges of the respective scissor-working blades is realized with saw teeth (2").

4. Shears, as per claim 1, characterized by the fact that the respective cutting counter blade (2") is realized with two parallel blades spaced apart by a value equal to the thickness of the cutting blade (1") so that the cutting action is effected when the cutting blade is inserted between the counter blades.

5. Shears, as per claim 1, characterized by the fact that the said cutting counter blade (2") is realized with two parallel blades spaced apart by a value equal to the thickness of the cutting blade (1") so that the cutting action is effected when the latter is inserted between the counter blades,these being underneath the cutting blade (1").