CUTTER BAR HAVING A SCISSOR WITH DOUBLE RECIPROCATING MOTION

Abstract

Cutter bar (10) of the type applicable to motor mowers or mowers comprising: a supporting bar (11); a lower blade or comb (12) sliding along the major axis with respect to the supporting bar (11) comprising a plurality of lower small blades or teeth (13); an upper blade (14) sliding along the major axis with respect to the supporting bar (11) arranged superimposed on the lower blade or comb and comprising a plurality of upper small blades (15); a control group (16) configured for imparting an opposite reciprocating motion to the blades (12, 14); bladeholder devices (17) acting on the upper surface of the upper blade (14);
wherein the lower small blades or teeth (13) have a thickness or mass greater than the upper small blades (15) and wherein the upper blade (14) comprises an upper supporting strip (20), to which the upper small blades (15) are constrained through rivets (21), the lower cylinder head (22) of the rivets (21) being housed in lowered seats (23) obtained on the upper face of the lower small blades or teeth (13).

Claims

1) Cutter bar (10) of the type applicable to motor mowers or mowers comprising: a supporting bar (11); a lower blade or comb (12) sliding along the major axis with respect to said supporting bar (11) comprising a plurality of lower small blades or teeth (13); an upper blade (14) sliding along the major axis with respect to said supporting bar (11) arranged superimposed on said lower blade and comprising a plurality of upper small blades (15); a control group (16) configured for imparting an opposite reciprocating motion to said blades (12, 14); bladeholder devices (17) acting on the upper surface of said upper blade (14); wherein said lower small blades or teeth (13) have a thickness or mass greater than said upper small blades (15) and wherein said upper blade (14) comprises an upper supporting strip (20), to which said upper small blades (15) are constrained by means of rivets (21), the lower cylinder head (22) of said rivets (21) being housed in lowered seats (23) obtained on the upper face of said lower small blades or teeth (13).

2) Cutter bar (10) according to claim 1, characterized in that said lower small blades or teeth (13) have a thickness at least double with respect to said upper small blades (15).

3) Cutter bar (10) according to claim 1, characterized in that said lower blade or comb (12) has a mass about double with respect to said upper blade (14).

4) Cutter bar (10) according to claim 2, characterized in that said lower blade or comb (12) has a mass about double with respect to said upper blade (14).

5) Cutter bar (10) according to claim 1, characterized in that said upper small blades (15) comprise a through-slot (31) at said lowered seats (23) to allow the discharge of plant material, preventing accumulations between said lower blade (12) and said upper blade (14).

6) Cutter bar (10) according to claim 1, characterized in that said supporting bar (11) comprises a track guide along the major sliding axis (18) for said lower blade or comb (12).

7) Cutter bar (10) according to claim 6, characterized in that said lower blade or comb (12) comprises a lower supporting strip (19) housed in said track (18), to which said lower small blades (13) are constrained.

8) Cutter bar (10) according to claim 6, characterized in that it comprises anti wear pads (24) between said lower small blades or teeth (13) and said lower supporting strip (19).

9) Cutter bar (10) according to claim 1, characterized in that it comprises a restraint (25) for connecting said lower blade (12) and said upper blade (14) with said bar (11) and for countering transverse thrusts.

Description

[0048] The characteristics and advantages of a cutter bar configured to make a scissor cut with double reciprocating motion of the upper and lower cutting components according to the present invention will become clearer from the following description, given as an example and not for limiting purposes, referring to the attached schematic drawings, in which:

[0049] FIGS. 1-3 are perspective views of the bar of the present invention respectively with the control group of the motion mounted and covered by a casing, with the control group of the motion mounted and visible, and with the control group of the motion released from the bar;

[0050] FIG. 4 is a side view of the bar of the present invention;

[0051] FIG. 5 is an enlarged view of the bar of FIG. 3;

[0052] FIGS. 6 and 7 are partially sectioned views of the bar of FIG. 5;

[0053] FIG. 8 is a detail of the front view of the bar of FIG. 5;

[0054] FIGS. 9 and 10 are section views of the bar of FIG. 8 along the section line A-A;

[0055] FIG. 11 is an exploded view of the bar of FIG. 5.

[0056] With reference to the figures, a cutter bar configured to make a scissor cut with double reciprocating motion of the upper blade and of the lower comb according to the present invention is shown with 10.

[0057] Such a cutter bar is of the type applicable to motor mowers or mowers and comprises: [0058] a supporting bar 11; [0059] a lower blade 12 sliding along the axis of the larger dimension of the supporting bar 11 comprising a plurality of lower small blades or teeth 13; [0060] an upper blade 14 sliding along the axis of the larger dimension of the supporting bar 11 arranged superimposed on the lower blade and comprising a plurality of upper small blades 15; [0061] a control group 16, of the known type, configured to impart an opposite reciprocating motion of unequal excursion to the blades 12, 14; [0062] bladeholder devices 17 acting on the upper surface of the upper blade 14 to ensure the scissor cutting effect between the blades 12, 14.

[0063] The control group 16 is fixed with bolts 28 to the bar 10 and interacts with the blades 12, 14 through relative heads 29, 30.

[0064] Starting from such a configuration, according to the invention the lower small blades or teeth 13 have a greater thickness or mass than the upper small blades 15.

[0065] In particular, the lower small blades 13 have at least double the thickness of the upper small blades 15 and/or the lower blade or comb 12 has about double the mass of the upper blade 14.

[0066] The supporting bar 11 is associated, for example through bolts 27, with front shaped elements 26 that make a sliding track guide 18 for the lower blade 12.

[0067] In particular, the lower blade or comb 12 comprises a lower supporting strip 19 housed in the track 18, to which the lower small blades 13 are constrained, preferably with interposition of anti wear pads 24.

[0068] The upper blade 14 comprises an upper supporting strip 20, to which the upper small blades 15 are constrained through rivets 21.

[0069] The lower cylinder head 22 of the rivets 21 is housed in lowered seats 23 obtained on the upper face of the lower small blades or teeth 13.

[0070] The upper small blades 15 comprise a through-slot 31 at the lowered seats 23 to allow the discharge of plant material, preventing accumulations between the lower blade 12 and the upper blade 14 that constitute the mobile elements.

[0071] Finally, the cutter bar 10 comprises a restraint 25 for connecting the blades 12, 14 and the bar 11 and for countering transverse thrusts.

[0072] It has thus been seen that a cutter bar configured to make a scissor cut with double reciprocating motion of the upper and lower cutting components according to the present invention achieves the purposes outlined earlier.

[0073] Indeed, the bar described and claimed here offers: [0074] greater resistance to impacts at the lower blade, now more correctly defined as comb, for example with stones or other material that can be encountered during cutting; [0075] it avoids the occurrence of clearances between the small cutting blades and the relative supporting strip; and [0076] it promotes the discharge of plant material, preventing accumulations between the blades.

[0077] The cutter bar configured to make a scissor cut with double reciprocating motion of the upper blades and of the lower comb of the present invention thus conceived can undergo numerous modifications and variants, all of which are covered by the same inventive concept; moreover, all of the details can be replaced by technically equivalent elements. In practice, the materials used, as well as their sizes, can be of whatever type according to the technical requirements.