FR2774936A1 - Garden secateurs - Google Patents

Abstract

The cutting tool consists of a movable blade (1) and a counter-blade (2) pivoting about an axis (3), and two handles (13,14) which are closed manually against a spring (12). The lever linkage consist of a link (5) pivoting about an axis (6) on an arm (4) of the blade (1). The other end of the link (5) is connected by a pin (10), which engages in a specifically shaped slot (9) to give the reduction factor depending at which end the pin is positioned.

Description

- 1 -

  The present invention relates to any tool for cutting such a secateurs key with one or two hands, requiring manual pressure on the handles in order to obtain the cutting action at the level of the active part situated opposite the handles with respect to the central axis. We know that in most cases the cutting action requires a significant effort on the part of the user, in particular

  when it is in the presence of a hard material or a large section. There are certain devices applied in particular to safety devices.

  to reduce the effort of the user through systems

  reduction gears according to which the opening of the cutting part is reduced compared to the opening of the handles, which provides a reduction effect but has the disadvantage of limiting the use of the tool to cuts of small section The tool designed according to the invention makes it possible to avoid this drawback thanks to a device giving the possibility of using two successive and complementary openings, one suitable for cuts of small section and the other suitable for cuts of section. more important or possibly of harder material.20 The characteristics and advantages of the invention will be highlighted

  evidenced by the drawings and the description below.

  Figure 1 shows a pruner in the closed position. As shown, the device consists of a convex movable blade (1) pivoting on a concave counter blade ((2) around a main axis (3) and comprising at its base an extension of a certain dimension (4). A link receiving a pin (6 and 10) at each of its ends connects the arm (4) extending the blade (1) to a metal part (7) integral with the handle (13) and taking axis on the counter blade (2) in a position provided for this purpose

- 2 -

  FIG. 2 represents a pruning shears in the so-called appropriate primary opening position; to cuts of small cross section and facilitated by a multiplier effect resulting from the gap existing between the

  between axes (3 - 6) and (8 - 10) then the latter is posi-

  actuated by the effect of the spring (12) in the lower part of the light (9) (9) this being obtained by imprinting on the handles an accentuated opening thus causing the lug (11) to bear on the arm (4) of the blade (1) which has the effect of pushing the link (5) towards the upper part of the light (9). the center distance (8-10) having become more reduced, this results in a more substantial reduction coefficient accompanied by a larger opening of the cutting parts;

  with ease of cutting large sections.

  Figure 4 shows a pruning shears in the closed position

  intermediary intervening at mid-stroke of a large section cut

  aunt and placing the device in the return position, under the effect of the spring (12) of the axis (10) towards the lower part of the light (9) this culi allows to complete the cutting action such that in

  so-called primary position and this with the least effort.

- 3 -

Claims (4)

  1- Cutting tool comprising the active part comprising a movable blade (1) pivoting on a counter blade (2) about an axis (3) and a gripping part comprising two branches   (13-14) manually activated to a closed position   divided by the action of a spring (12) and characterized in this key the cutting action is facilitated by a reduction device 2- Cutting tool according to claim (1) characterized in that the reduction device allows the Implementation   two complementary multiplier coefficients.   3- Cutting tool according to claims (1-2) characterized   in this key the reduction device comprises a link (5) connected by an axis (6) to the arm (4) extending the blade (1) and by a second axis (10) to a part (7) secured to the branch ( 13)   being connected by an axis (8) to the counter blade (2).   4- OXltil to cut according to claim (3) characterized in that the part (7) has in its middle a light (9) of; suitable shape to receive the axis (10) either in its area   lower resulting in a multiplier coefficient   mayor suitable for cutting small sections, either in his area   higher resulting in a second multiplier coefficient   suitable for cutting large sections.   - Cutting tool according to claim (4) characterized in that the link (5) comprises at the end receiving the axis (6) a lug (11) having the function of pushing the axis (10) towards the area upper light (9) due to a lur stop effect   the arm (4) obtained by the accentuated opening of the branches (13-14).   6- Cutting tool according to claims (4-5) characterized   in this cqe the reduction device is served by a return spring (12) one of the arms of which bears on the axis (3) and the other arm on the axis (10). In addition to the return action towards the open position of the tool, the spring (12Y has the function of ensuring the return of the axis (10) to the lower zone of the light (9) after use of its positioning at the level   of the upper area of said light.