JPH02109908A - Cutter hed for mower - Google Patents

Abstract

PURPOSE: To easily put a thread through by forming guide holes on the two projecting wall parts of a case main body housing the bobbin body of a cut thread. CONSTITUTION: The guide holes 21 are formed to a guide bush 22 fitted to a ring-formed groove 35 with which the edge parts 36 and 37 of the walls 33 and 34 of a main body 14 and a cover 15 are engaged. In addition the guide holes are respectively formed on projections 39 engaged with the free spaces of the wall 33 of the main body 14 and the wall 34 of the cover 14. The separated face 13 of a case 12 is formed stepwise near the guide holes. The guide holes 21 are respectively deviated in the direction of the bottom 16 of the main body 14 with respect to a separated surface 13. The long part of the surface 13 is almost on the surface of the flange 23 of the bobbing body 19 and the external surface of the flange 23 faces the bottom 16 of the main body 14.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a cutter head for a motorized mower according to the preamble of the claims.

[Prior art]

In the case of the cutter head known from U.S. Pat. No. 4,651,421, the lid of the case is screwed onto the upper edge of a pot-shaped body in which a bobbin body carrying a spool of thread is rotatably supported in stages. ing. The end of the cutting system is guided through the wall of the body. A guide bushing is placed on the wall of the main body for penetration. Since the bobbin body is completely inside the pot-shaped case body after being inserted into the case, it is difficult and laborious to bring the end of the cut thread out from the inside through the guide bushing.

[Problem to be solved by the invention]

The present invention proposes to make the cutter head so that it can access the inner chamber of the case even when the bobbin body is inserted and the lid is removed so that the cut thread can be easily threaded. This is an issue.

[Means to solve problems]

The present invention solves the above problems with the configurations shown in the claims.

[Function and Effect] When the case is formed in this way, the lid has a relatively high peripheral wall, which is in contact with the wall of the main body at a separation surface of the case, with this separation surface being approximately above the case. in the radial central plane of or below this central plane with respect to the bottom of the body. If the bobbin body is inserted into the body of the case, the bobbin can be easily accessed from the side when the lid of the case is removed. The ends of the cut threads can therefore be easily grasped and threaded through guide holes which are advantageously provided in the two projecting walls of the body.

〔Example〕

Further configurations of the cutter head according to the invention result from the configuration of the embodiments presented below, the following description and the drawing in which preferred embodiments of the cutter head are shown.

FIG. 1 shows a mower 2 with a cutter head 1. FIG.

The mower is provided for cutting or mowing lawns, grass, etc. The mower is carried by an operator 3 on a shoulder belt 4 and guided by hand with a handle-like grip protrusion 5 fixed approximately in the middle of the guide vibro. A drive motor 7, which can be implemented as an internal combustion engine, is arranged at the upper end of the guide vibro. The lower end of the guide vibro is provided with an angled connection 8, to which the rad 1 is removably fixed to the cutter.

The cutter head 1 is driven by the prime mover 7 via a drive connection located in the guide vibro, and rotates about an axis 9. A protective cover 11 is provided at the connection part 8 of the cutting device 2, which is a grass mower, for shielding the cutting thread IO pulled out from the cutting thread 1 to the cutter. of the cutting device, the effective thread length for cutting the cutting thread being thus set at the upper limit.

The cutter head consists of a body 14 and a lid 15, and therefore has two parts.
The body 14 with an approximately cylindrical case 12 formed as a part is pot-shaped from the base 16 and the cylindrical wall 33. The lid 5 has a cylindrical wall 34 and is likewise pot-shaped.

The opposite edges of the body 14 and the lid 15 are ring-shaped up to the area of the two connecting projections, and the separation surface 13 of the case 12
(Figures 2 and 3).

A hub 17 coaxial with the shaft 9 is formed on the bottom 16 of the main body 14 . The lid 15 is generally parallel to the bottom 16 and has snap connections (Schnap
It is connected to the main body 14 via a pverb.

In the interior chamber 18 of the case 12, there is a bobbin body 19 which is arranged coaxially with respect to the shaft 9 and is rotatably arranged. A cut thread lO, which can be formed as a synthetic resin tape, is wound around the bobbin body 19.

The thread 10 has two free ends 20 which are drawn out around the casing 12 through holes 21 in two guide bushings 22 and are tensioned by centrifugal force when the cutter head rotates. The two holes 21 held in position form a guide for the cutting thread 10 in the transition position towards the cutting thread end 20. The bore axes of the two mutually diametrically opposed guide bushes 22 lie approximately in the central radial plane of the bobbin body 19 and of the case 12 with two parallel flanges 23 and 24 delimiting the winding space. .

Inside the bobbin body 19, a switching sleeve (Sc
halLhiilse) 25 is located.

Inside the case 12, a switching sleeve 25 is further penetrated,
A pot-shaped switching body (Scha I tk6rper
) 27 is provided, said coil compression spring 28 being arranged exclusively in and coaxially with the switching body 27. Mounted on the inside of the switching sleeve 25 are a plurality of protruding cams 29 to which are associated stops 30 that project radially around the switching body 27 . The cams 29 and the stops 30 are distributed at regular intervals in different radial planes. Therefore, cut thread 1
0 is the subsequent supply (na(hfOrder
n) to be done.

The coil compression spring 28 is supported on the inner end surface of the switching body 27 or the hub 17. The ends of the coil compression springs have a plurality of winding bones formed on the hub 17's bone protrusions 31 or opposing bone protrusions 3 formed on the inside of the switching body 27.
You are guided to 2.

As is clear from FIGS. 2 and 3, the guide bushing 22 is a part of the separating surface 13.
It is arranged symmetrically with respect to l 3 b. A ring groove 35 is formed around each guide bush 22, into which a substantially semicircular edge 36 of the lid wall 34 engages on one side and a similarly semicircular edge 36 on the other side. is engaged by an edge 37 formed in the protrusion 39 of the wall 33 of the body 14 and bounding a semicircular recess 38 in which the guide bushing 22 is engaged and held. has been done.

The projections 39 are formed as projections on the wall 33 of the body 14 and are arranged in diametrically opposed recesses 40 in the lid wall 34.
closely engage with.

Since the separation surface 13 is stepped by the projections 39,
Both partially circular parts of the separation surface 13 (Abschnit
t) The part 13a, in which both parts 13b are formed, which are shorter than the part 13a, is separated by a relatively small distance from the bottom 16 of the body 14, the distance being equal to the inner height of the inner chamber 18; It is about one quarter of that.

The distance of the further part 13b of the separating surface 13 from the bottom 16 is approximately twice that, so that this part 13b is approximately equal to the 0 separating surface 1 in the central radial plane of the case 12.
The portion 13a of the number 3 lies approximately on the side of the flange 23 of the bobbin body facing the bottom 16 of the body 14. Therefore, when the lid 15 is removed, the bobbin body 19 with the spool inserted into the body 14 is considerably free, while the guide bushing 22 is held in the narrow projection 39. .

At that time, cut 10 threads without the case getting in the way.
Both ends 20 of can be threaded through the guide bushing 22. After fitting the lid 15, the lid wall 34 grips the two projections 39 with its edges 41, so that the housing 12 is closed on all sides.

This configuration of the case 12 allows easy assembly of the insert of the cutter head as well as easy replacement of the spool since the interior of the case is easily accessible when the 1i15 is removed.

Embodiments of the present invention are as shown below.

(1) Each of the guide bushes (22) has an annular groove (35) around its periphery in which the edges (36 and 37) of the walls (33 or 34) of the main bodies (14) and 11 (15) engage, respectively. Cutter head according to claim 1, characterized in that the guide holes (21) are each made by a hole.

(2) The guide bush (22) is held by the engaging portion in the approximately semicircular recess (38) on the wall (14) of the main body (14).
The cutter head according to claim 1, wherein the vP characteristic is that the edge (37) of the cutter head (33) is bounded by the edge (37) of the cutter head.

(3) belongs to the wall (33) of the main body (14) and belongs to the wall (34) of the lid;
Claim 1 or Claim 2, characterized in that each of the protrusions (39), which engage tightly in the cavities (40) of the Cutter head as described.

(4) The separation surface (13) of the case (12)
I) in the vicinity of the guide hole (21
) in each one part (13b) of the separation surface (13), for which part the bottom (16 ) or the first claim
The cutter head according to any one of items 1 to 3.

(5) The long part (13a) of the separating surface (13) lies approximately in the plane of the flange (23) of the bobbin body (19), with the outer surface of this flange (23) facing the bottom (16) of the body (14).
The cutter head according to item 4, characterized in that the cutter head faces .

[Brief explanation of the drawing]

Figure 1 shows a mower with a cutter head, Figure 2 is an enlarged view of the axial cross section of the power/interhead according to Figure 1, Figure 3 is a partial side view of the cutter head, and Figure 4 shows the case lid. A plan view when removed, the upper part of the drawing showing the guide bush with the threaded end, the area inside the bobbin body schematically shown, and the lower part of the drawing showing the part of the bobbin body removed. This is a diagram showing the 1... Cutter head 10... Cutting thread 12...
Case 13... Separation surface 14... Main body
15... Lid 19... Bobbin body 21
...Guide hole 33...Wall

Claims (1)

[Claims] (1) It rotates around a rotating shaft and consists of a roughly pot-shaped main body and a lid, and a bobbin body for winding cut thread is housed inside, with at least one end protruding through a guide hole in the case wall. In a cutter head for a motorized mower with a case consisting of two parts, the main body (
14) and the lid (15) are the separation surface (13) of the case (12)
The guide holes (21) are in contact with each other along the bottom of the main body (14) or in the separation surface (1).
3) A cutter head characterized by being located at the top of the item.