RU139414U1 - SECATOR - Google Patents

Abstract

1. Secateurs, comprising a blade with a shank, an anvil and two levers, the first of which is rigidly connected to the anvil and pivotally connected to the shank, and the second lever is pivotally connected to the anvil, and a longitudinal groove is made in the anvil from the blade side, a spacer is fixed on the first lever spring, and on the second lever on the side facing the first lever, a roller and a latch are installed, while the free end of the shank rests on one end with a spring, and contacts the roller with the opposite edge with the possibility of w sliding along nego.2. The secateurs according to claim 1, characterized in that the latch is mounted with the possibility of longitudinal reciprocating movement along the second lever and with the possibility of engagement with the end face of the shank. The secateurs according to claim 1, characterized in that an insert of softer material than the blade is placed in the groove of the anvil. The pruner according to claim 3, characterized in that the insert material is rubber or plastic.

Description

The utility model relates to a manual agricultural tool and can be used to trim fruit trees and shrubs. Also, the proposed utility model can be used when cutting cable or thin sheet material.

A pruner is known from the prior art containing two articulated cheeks, one of which has a blade, two handles with a spacer spring between them (copyright certificate SU 125443, 1957). An elastic rubber strip extends along the blade, protruding slightly beyond the cutting edge. However, the rubber strip serves to hold the legs of the cut fruit and does not protect the sharp edge of the blade from blunting

The disadvantages of the known secateurs include increased effort when working with the tool.

A secateurs are also known, containing an anvil with a groove, a knife and two handles (patent US D 650249, 12/13/2011).

The closest analogue is the secateurs according to the patent US 8266804, 2012, containing an anvil with a groove, a knife, two handles and a latch.

The disadvantage of secateurs is the need for a fairly significant effort when cutting, for example, knots. In this case, at the moment when the knot is cut, the force cannot be released instantly, and the pruning blade by force of inertia enters the anvil. This leads to its rapid dulling. Weak edge protection against blunting is another drawback of the pruning shears.

The proposed design of the secateurs allows you to overcome these disadvantages ..

A pruner according to a utility model includes a blade with a shank, an anvil and two levers. The first lever is rigidly connected to the anvil and pivotally connected to the shank closer to the blade. The second lever is pivotally connected to the anvil. A longitudinal groove is made in the anvil on the blade side. A spacer spring is attached to the first lever, which, in the absence of loads, leads the pruning shears to an open, ready-for-use state. A roller and a latch are mounted on the second lever on the side facing the first lever, the free end of the shank resting on one end with a spring, and in contact with the opposite edge of the roller sliding along it. The latch is mounted with the possibility of reciprocating movement along the second lever (for example, in the lateral grooves) and with the possibility of engagement with the end face of the shank.

In the groove of the anvil can be placed an insert of softer than the blade material, for example, rubber or plastic. When the levers are completely shifted, the blade, chopping, for example, a knot, rests on a soft insert and does not stupid. The proposed utility model is illustrated by drawings, in which:

FIG. 1 - secateurs in the open state, front view,

FIG. 2 - section CC

FIG. 3 - secateurs in the folded position,

FIG. 4 - blade with a shank,

FIG. 5 is a schematic illustration of a pruner with an indication of the acting forces and distances (leverage), illustrating the calculation of forces during operation of the tool.

Secateurs 1 includes a blade 2 with a shank 3, anvil 4 and two levers 5, 6. The first lever 5 is rigidly connected to the anvil 4 and pivotally connected to the shank 3 closer to the blade 2. The second lever 6 is pivotally connected to the anvil 4. In the anvil 4 with side of the blade 2 a longitudinal groove 7 is made, in which an insert 8 of elastic material is placed. On the first lever 5, a spacer spring 9 is fixed, leading the secateurs 1, in the absence of loads, to an open state, i.e. ready to move. A roller 10 and a latch 11 are mounted on the second lever 6 on the side facing the first lever 5, while the free end of the shank 3 rests on one end 12 against a spacer spring 9, and contacts the roller 10 with the opposite edge 13 to slide along it. The latch 11 is mounted with the possibility of reciprocating movement in the side grooves 14 of the second lever bis with the possibility of engagement for the end face 15 of the shank 3.

A roller and a shank pivotally connected to the first lever and supported by a spacer spring together form a roller mechanism.

The advantages of the proposed utility model are as follows:

1. Roller mechanism allows you to cut knots with less effort than in a conventional secateurs.

2. The clamp allows you to reduce the size, to eliminate accidental cuts when the secateurs are in the idle position.

3. The insert protects the pruning blade from blunting during operation.

Comparative calculation of forces for a conventional secateurs and secateurs with a roller mechanism:

By the basic rule of mechanics for a conventional secateurs, we have

Where is the bitch about. - the force arising on the blade of a conventional secateurs, when cutting a knot,

L knot - the distance from the axis of the secateurs to the cut knot,

Fkisti - effort created by the user's brush,

Lever - handle lever length

From formula (1) we have

For secateurs with a roller mechanism, we have (see Fig. 5)

Where is the bitch p. - the force arising on the blade secateurs with a roller mechanism, when cutting a knot,

Frolika - force arising at the point where the roller presses on the blade lever

Lrl - the distance from the roller to the axis of the blade

On the other hand, we have -

Where Lrolika is the distance from the axis of the roller to the axis of the second lever.

From the formula (4) it follows -

Substituting (5) into (3), we obtain

To compare the efforts, we divide (6) by (2)

F knot p. / F knot f. = Lрл / L

Conclusion: In a secateurs with a roller mechanism, a greater effort develops than in a conventional secateurs; many times as much as the distance from the axis of the blade to the roller is greater than the distance from the same axis of the blade to the cut knot.

Claims (4)

1. Secateurs, comprising a blade with a shank, an anvil and two levers, the first of which is rigidly connected to the anvil and pivotally connected to the shank, and the second lever is pivotally connected to the anvil, and a longitudinal groove is made in the anvil from the blade side, a spacer is fixed on the first lever spring, and on the second lever on the side facing the first lever, a roller and a latch are installed, while the free end of the shank rests on one end with a spring, and contacts the roller with the opposite edge with the possibility of w sliding along it. 2. The secateurs according to claim 1, characterized in that the latch is mounted with the possibility of longitudinal reciprocating movement along the second lever and with the possibility of engagement with the end face of the shank. 3. The secateurs according to claim 1, characterized in that an insert of softer material than the blade is placed in the groove of the anvil. 4. The secateurs according to claim 3, characterized in that the insert material is rubber or plastic.

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