JPH0646258Y2 - Mower base structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a base structure of a mower equipped with a plurality of running wheels and rotary blades and a drive source for rotary blades and the like.

(Prior Art) FIG. 5 shows a side view of a conventional mower, in which an engine 25 is mounted on a base 1 and one front wheel 17 and two rear wheels 18 are used as traveling wheels. Equipped with a rotary blade on the left front
Equipped with 30. The rotary blade 30 is linked to an output shaft 29 of the engine 25 via a belt drive device 26, and is supported by the tip of a rotary blade support arm 31. The rotary blade support arm 31 is supported by a support shaft 28 so as to be swingable in the vertical direction, and is configured to be extendable / contractible in the length direction. . By lowering this rotary blade support arm 31,
The rotary blade 30 is lowered to the working position, the pulley shaft center distance of the belt drive device 26 is expanded, and the belt 27 is engaged. The rotary blade support arm 31 is connected to a clutch lever 37 of the work handle 21 via a control lever 32, a control rod 33, an adjustable relay lever 35 and a rod 36. Further, the return spring 39 urges the rotary blade support arm 31 to the upper disengagement position side, and returns the rotary blade 30 upward when the clutch is released. An upper end portion of the return spring 39 is locked by a bracket 40 provided on the engine 25.

FIG. 4 shows a conventional base structure used in the mower of FIG. 5, which is composed of a plurality of sheet metal frame members and the like. That is, the outer frame is composed of left and right separate sheet metal side frame 51, 52, and a pair of front and rear sheet metal engine mounting frames 55 are welded between the side frames 51, 52 to form a U-shape at the rear. A sheet metal work handle mounting stay 53 and a body lifting handle 54 integral with the sheet metal work stay 53 are fixed by bolts, and reinforcement frames 56, 56 are fixed between the stays 53, 53 and the side frames 51, 52 by bolts. is doing. When the base 1 is entirely made of sheet metal in this way: (1) Since the sheet metal itself has low rigidity, the frame thickness must be increased in order to ensure strength and vibration resistance. Moreover, since the number of parts is large and it is necessary to connect the frame members with bolts or the like, the base 1 becomes heavy and it takes time to assemble.

(2) Especially in the case of the three-wheel type as shown in FIG. 4, a large torsional load is applied to the front axle support portion, so that it becomes necessary to further increase the plate thickness of the frame.

(3) Outer frame 5 as a handle attachment member for work
A frame 53, which is a separate member from the members 1 and 52, must be attached.

(4) When the vehicle body is lifted up, even if the vehicle body lifting handle 54 at the rear portion and the bent portion 52a at the front portion of FIG.

FIG. 6 shows another conventional example. A left side frame 61 and a left side work handle mounting stay 64 are integrally molded with a sheet metal material, and a right side frame 62 and a left side work handle mounting stay 65 are formed. The stays 64 and 65 are integrally molded with a sheet metal material, and the stays 64 and 65 are connected by a handle 66 for lifting the vehicle body made of sheet metal material. This is a supported example.

However, in this structure as well, since the entire frame is sheet metal, an increase in weight is unavoidable, and the side frames 61, 62
In order to integrally press-mold the stays 64 and 65 into a V shape,
Material acquisition becomes uneconomical. Further, when the vehicle body is lifted up, a front lifting handle must be newly provided, and the rear lifting handle frame 66 is made of sheet metal, so that the operator's hand is hurt.

As a base that uses pipes, there is the actual open sho 62-164729, etc., but separate members made of sheet metal are welded to the front axle support and work handle mounting stays, etc. Is not provided.

(Purpose of the invention) The purpose of the present invention is to reduce the weight and size of the base, improve the rigidity,
This includes reducing the number of parts.

(Technical means for achieving the object) In order to achieve the above object, the device according to claim 1 of the present application,
The outer frame portion of the base is formed by a single pipe frame integrally having left and right side portions and front and rear bent portions, and an engine mounting frame formed of a sheet metal bent material is fixed to the pipe frame, A pair of front axle support portions extending forward is integrally formed at the front end portion of the pipe frame, and a vertical flat portion by caulking is integrally formed at each front end portion of each front axle support portion, and the front axle portion is formed at the flat portion. A mounting hole is formed so that both front axles can be supported, and the rear part of the pipe frame is bent substantially upward to form a work handle mounting stay part, and the rear bent part and the front bent part are handles for lifting the vehicle body. I also try to double as.

According to a second aspect of the present invention, in a mower equipped with a plurality of running wheels and rotary blades and a drive source for rotary blades or the like, an outer frame portion of a base is provided with left and right side portions and front and rear bent portions. It is formed by a single pipe frame which is integrally provided, and an engine mounting frame formed by a bent sheet metal is fixed to the pipe frame, and a pair of front axle support portions extending forward is integrally formed at a front end portion of the pipe frame. The front flat portion is formed integrally with the front end portion of each front axle support portion by caulking, and the front axle mounting hole is formed in the flat portion so that the front axle can be supported at both ends, The rear portion is bent substantially upward to form a work handle attachment stay portion, and the rear side bent portion also serves as a rear body lifting handle, and a front front body lifting handle made of pipe, which is separate from the pipe frame, is attached to the front side. Bent and Secured to the engine mounting frame, and has one end of the return spring of the rotary blade supporting arm to engage with the distal end of the handle for the upper front body lifting.

(Embodiment 1) FIG. 1 is a base 1 of a mower to which the invention according to claim 1 is applied.
The outer frame portion of the base 1 is a single pipe frame 2 that integrally has left and right side portions and front and rear bent portions 3 and 5.
It is formed by. The pipe frame 2 is a pipe having a circular cross section, and both the bent portions 3 and 5 extend substantially parallel to the axle. Two engine mounting frames 7 are provided between the left and right side portions of the pipe frame 2 with front and rear spaces.
Is welded, the engine mounting frame 7 is formed by bending a sheet metal into a U-shaped cross section, and the upper surface thereof is flat so that the engine can be easily mounted.
An engine mounting bolt hole 17 is formed.

The rear portion of the pipe frame 2 is bent in a V-shape so as to face generally rearward and upward, so that a work handle attachment stay portion 10 is integrally formed.

The front end portion of the left side portion of the pipe frame 2 extends forward as it is to integrally form a front axle support portion 8a, and the right front end portion of the pipe frame 2 is left side of the pipe frame 2 via the front side bent portion 3. A front axle support portion 8b is formed integrally with the front axle support portion 8a to extend forward in parallel with the front axle support portion 8a. Vertical flat portions 12 formed by caulking are integrally formed at the front end portions of both front axle support portions 8a and 8b. Front flat axle mounting holes 15 are formed in the flat portions 12, respectively, and the front axle 17 has an axle. It is designed to support both.

Rear axle mounting holes 16 are formed in the lower ends of the stays 10 to support the axles of the left and right rear wheels 18, respectively.

For example, one work handle mounting hole 20 is formed in the upper portion of each stay portion 10, and a work handle 21 is mounted by a bolt as shown in FIG. 1a.

The basic structure of the mower is the same as in Fig. 5, so
The description is omitted.

When the vehicle body is lifted up, the front side bent portion 3 and the rear side bent portion 5 are manually held as handles for lifting the vehicle body. At this time, since the bent portions 3 and 5 are pipes, they are easy to hold, and the hand is not hurt.

(Embodiment 2) FIG. 2 is a base 1 of a mower to which the device according to claim 2 is applied.
In addition to the structure including the pipe frame 2 having the same shape as that of FIG. 1 and the engine mounting frame 7 made of a bent sheet metal, the front part of the pipe made of a pipe separate from the pipe frame 2 is lifted at the front part. The handle 23 is welded. The front vehicle body lifting handle 23 is formed of a pipe having a circular cross-section, and is welded to the front engine mounting frame 7 and the front bending portion 3 at a total of two places in a substantially central portion of the base 1 in the left-right direction. It extends upward and is bent to the left at the upper end. A horizontal flat portion 23a is formed by caulking at the left end portion of the front vehicle body lifting handle 23, and a return spring locking hole 24 is formed in the flat portion 23a.

3 is an overall side view of the mower equipped with the base 1 of FIG. 2, in which the upper end of the return spring 39 of the rotary blade support arm 31 is locked to the left end of the front body lifting handle 23. There is.

Except for the structure of the base 1 and the return spring mounting structure, the structure is the same as that shown in FIG.
The description of the Kutch operation system etc. is omitted.

When lifting the vehicle body, the front body lifting handle 23
And hold the rear folding part 5 by hand. At this time, since the bent portions 3 and 5 are pipes, they are easy to hold, and the hand is not hurt.

(Other Embodiments) The front axle support portion of the pipe frame may have a cantilever structure having only one end portion.

(Advantages of the Invention) As described above, according to the invention of claim 1, (1) the left and right side portions of the base 1, the front and rear bent portions 3, 5, the front axle support portions 8a, 8b and the work handle. 1 mounting stay part
Since it is formed by the pipe frame 2 of the book, it has a higher rigidity and is lighter and more compact than the conventional pedestal which is entirely composed of sheet metal members.

Also, compared to the structure such as the actual open sho 62-164729, it is not necessary to provide a special work handle attachment member and front axle support member, the number of parts is small and the rigidity is high.

In particular, in a three-wheel structure with one front wheel 17 and two rear wheels 18, the front axle support portions 8a and 8b are supported on both sides to significantly improve the rigidity of the base when the vehicle falls. To do.

(2) It is not necessary to provide a special handle member for lifting the vehicle body on both front and rear sides.

(3) As the engine mounting frame 7 is a frame made of bent sheet metal, it is easy to mount the engine and the engine mounting bolt does not loosen due to vibration or the like.

(4) Since the work handle mounting stay portion 10 is formed of a pipe integrated with the pipe frame 2, the number of work handle mounting bolts is minimum (for example, one on the left and one on the right).
Is enough.

Further, as described in claim 2, a pipe front vehicle body lifting handle 23, which is separate from the pipe frame 2, is fixed to the front bending portion 3 and the engine mounting frame 7, and the return spring of the rotary blade support arm 31 is provided. By locking one end of 39 to the tip of the front body lifting handle 23: (1) The rigidity of the base can be further improved.

(2) It is not necessary to provide a bracket or the like for locking the return spring on the engine, and the structure is further simplified. Further, since the front body lifting handle is formed of a pipe, it is possible to suppress an increase in weight.

[Brief description of drawings]

FIG. 1 is a perspective view of a base to which the invention according to claim 1 of the present application is applied, FIG. 1a is an enlarged detailed view of an A portion of FIG. 1, and FIG. Base perspective view, third
FIG. 4 is an overall side view of a mower equipped with the base of FIG. 2, FIG. 4 is a perspective view of a conventional base, and FIG. 5 is an overall side view of a mower equipped with the base of FIG. FIG. 6 is a perspective view of another conventional example. 1 ... Base, 2 ... Pipe frame, 3 ... Front bent part, 5 ... Rear bent part, 7 ... Engine mounting frame,
8 ... front axle support, 10 ... work handle mounting stay, 15 ... front axle mounting hole, 17 ... front wheel, 18 ... rear wheel, 23 ... front body lifting handle

Claims (2)

[Scope of utility model registration request] 1. A mower equipped with a plurality of running wheels and rotary blades and equipped with a drive source for rotary blades, etc., wherein an outer frame portion of a base has left and right side portions and front and rear bent portions integrally. It is formed by one pipe frame, and on the pipe frame,
An engine mounting frame formed by sheet metal bending material is fixed, a pair of front axle support portions extending forward is integrally formed at the front end portion of the pipe frame, and the front end portions of the front axle support portions are vertically crimped respectively. A flat portion is integrally formed, and a front axle mounting hole is formed in the flat portion so that both front axles can be supported, and the rear portion of the pipe frame is bent substantially upward to form a work handle mounting stay portion. A base structure for a mower, wherein the side bent portion and the front bent portion also serve as a handle for lifting a vehicle body. 2. A mower equipped with a plurality of running wheels and rotary blades and equipped with a drive source for rotary blades, etc., wherein an outer frame portion of a base is integrally formed with left and right side portions and front and rear bent portions. It is formed by one pipe frame, and on the pipe frame,
An engine mounting frame formed by sheet metal bending material is fixed, a pair of front axle support portions extending forward is integrally formed at the front end portion of the pipe frame, and the front end portions of the front axle support portions are vertically crimped respectively. A flat portion is integrally formed, and a front axle mounting hole is formed in the flat portion so that both front axles can be supported, and the rear portion of the pipe frame is bent substantially upward to form a work handle mounting stay portion. The side bent portion also serves as the rear body lifting handle, and the front body lifting handle made of a pipe, which is separate from the pipe frame, is fixed to the front bending portion and the engine mounting frame, and the rotary blade support arm is also provided. A base structure of a mower, wherein one end of a return spring of the above is locked to a front end of a front body lifting handle.