ES2534492B1 - Double rotating propeller system for lawnmower - Google Patents

Abstract

Double rotating propeller system for lawnmowers designed to increase the mowing efficiency using a “scissor effect” by combining the action of two propellers or blades that rotate in the opposite direction. Said system consists of an assembly that is coupled to the motor skin transmission shaft of the lawnmower machine and that rotates a propeller in the primary direction of the motor, while rotating in the opposite direction and in a secondary way, another propeller separated a few centimeters from the previous one. The contragiro of one of the propellers is achieved by the action of a pinion-crown assembly that reverses the direction of rotation of the main axis from which it takes its force. For those lawnmowers that do not carry this system as standard, and want to place it, adaptive elements are presented.

Description

DESCRIPTION

DOUBLE HELICE CO NT RAR ROT BEFORE SYSTEM FOR MACHINE

MOWER

OBJECT OF THE INVENTION

It is a system that tries to increase the efficiency of cutting the lawn by being applied to a conventional lawnmower. Either to apply the system an existing machine, or to incorporate a machine during the series manufacturing process. A common mowing machine with only one blade or cutting blade Neva, this mono-silica system, common in all known machines in this field, has the disadvantage that part of the lawn escapes from the cutting blade. However, with this cutting system an extra propeller is added that rotates in the opposite direction to the other, that is, two counter-rotating propellers, looking for a “scissor-type” mowing or cutting effect so that the work efficiency or performance In the lawnmower machine increase considerably, decreasing the number of "passes" with the machine by the same site when cutting the lawn. In addition to the fact that the lawn is much more crushed, or cut into smaller pieces, its apparent density is increased, and therefore, the collection capacity of the plant material cut in the tank that is usually coupled in any machine is increased lawn mower

20 BACKGROUND OF THE INVENTION

There is a huge number of lawnmowers. But no patent records were found for lawnmowers. In other fields of industry there are counter-rotating systems applied, for example, in camshafts for the automotive industry or propellers for nautical use but nothing similar has been found in the field of lawn mowers.

The system consists of applying a blade in the opposite direction to another so that no blade of grass remains uncut, since in existing systems, since there is only one blade, many grass stalks escape when they slide along the cutting blade or hblice whose effectiveness is entrusted exclusively to the speed of rotation, and the sharpness of the blade. With this system another hube is coupled with sharp edges on opposite sides and that rotates in the opposite direction very close to the previous one, so that when a grass stalk is under the cutting pitch of the

10 mower machine, if not cut by the action of the first hibice because it has escaped or slipped, it will be trapped and cut under the action of the second hblice, as a result of a physical principle very similar to that of a scissor hand.

For machines already existing in the market, a “kit” of.

15 coupling for the installation of which it is only required to decouple the existing hblice, and attach the assembly presented here, to the machine's transmission shaft. To obtain a counter-rotating effect, starting from a single motor and rotating in only one direction, a pifibn-crown transmission system is used so that one of the propellers turns in the opposite direction.

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Figure 1: Elements that make up or configure the system.

(There is a vertical and a horizontal section of the proposed system) 5 Within “figure 1”, each number means the following:

10

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1. Rotation axis of existing machine.

2. Adjustment screw or tighten to adapt to existing machine.

3. Assembly piece to fit existing machine.

4. Ring to prevent the sliding of the bearing on the shaft

5. Bearing coupled to the shaft.

6. Main axis of rotation.

7. Housing that rotates and holds a large part of the elements and is connected to the main shaft by means of bearings.

8. Toothed pinion integral to the main axis.

9. Shaft to hold a pinion fixedly attached to the housing

10. Pinion with inner bearing.

11. Serrated crown to the housing

12. H6lice or secondary blade for cutting grass in solidarity with housing.

13. H6lice or primary grass cutting blade integral to the main shaft

In view of Figure 1, an embodiment is described as follows: Starting from a drive shaft (1) of the mower machine and 5 assuming that the system does not come from the factory and therefore is coupled to a an existing machine that does not have it, because a tubular part (3) is coupled to said shaft (3) until both pieces are joined in solidarity and for this purpose it is possible to use tightening screws (2) Once the set described has been fitted its operation: The axis that receives the rotational force of the motor (6) directly transmits 10 its turning force to one of the code cabins (13) On this axis (6) a serrated pifibn (8) and two Bearings (5) that hold, while allowing to rotate the housing (7) To prevent these bearings from sliding up or down, each of them, Neva incorporated, to the transmission shaft (6) two rings (4) ) that make "cap".

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The housing (7) Snows inside a serrated pifibn (10) with a bearing inside and with two rings (4) with the same function described and which allows the pifibn to rotate freely, but without raising or lowering. Said serrated pifibn (10) revolves around an axis (9) that is fixedly fixed to the housing (7) The pifibn (10) being engaged with the pifibn (8) reverses its rotation and transmits it to a crown Toothed (11) with which it was engaged, this toothed crown being fixed or joined in a fixed way in all its perimeter with the housing (7) Upon receiving the turn the toothed crown is transmitted to the housing by which it was attached and which at the same time it is in solidarity with the other hblice (12) thus achieving itself! get a turn opposite to the previous hblice.

Claims (2)

5 10 fifteen twenty 25 ES 2 534 492 A1 1. Double-hinge counter-rotating system for lawn mower, in view of Figure 1, characterized by its ability to engage a drive shaft (1) of an existing lawn mower, adjusting by means of parts (2) and (3 ) and transmitting its turning force to an axis (6) that in a primary way directly moves an Itelice of code (13) and in a secondary way causes another Itelice to move in the opposite direction, or counter-rotating, that is integral to a housing (7) that is attached pro its ends to the shaft (6) but allowing its rotation thanks to two bearings (5) that can not slide on the shaft thanks to rings or stops (4) In turn this housing (7) Neva fixedly attached inside a toothed crown (11) that is meshed with the pirten (10) and therefore receiving the force and the same direction of rotation of said pirten that has a bearing inside to be able to freely rotate around an axis (9) that is fixedly attached to said housing by both ends. Engraved this pir16n (10) with the piiten (8) that is jointly and severally attached to the main shaft (6), receives its strength and transmits it to the crown from which it is engaged, but reversing its direction of rotation. 2. Double counter-rotating Itelice system for a lawn mower, according to the previous claim, characterized in that it can be incorporated into existing lawnmowers thanks to the adaptation parts (2) and (3) or be already included as standard in new lawnmowers, without the need to use or apply to the set, said adaptation parts.