JPS6246826Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a chain saw in which an engine whose cylinder axis is substantially perpendicular is housed in a case.

Conventionally, in this type of chain saw, a cylinder cover that covers the cylinder and the carburetor has been detachably fixed to the upper part of the case. When inspecting or adjusting the carburetor or cleaning the air cleaner that is stuck to the carburetor, this cylinder cover must be removed. However, carburetors and air cleaners are inspected and maintained more frequently than cylinders, so they must be inspected and maintained each time. Since cylinders that do not require inspection are also opened, the cylinder cover becomes large and the structure for fixing and removing the fasteners becomes complicated, making inspection and maintenance work cumbersome. For this reason, a carburetor cover that opens only the carburetor and air cleaner parts can be detachably installed on the case or cylinder cover, but the outer edge of this carburetor cover must be tightened to the case etc. with screws. Normally, four screws need to be removed when attaching or removing the container cover. If this is tightened in one place using a large screw handle that has a handle attached to a screw, attachment and detachment will be extremely easy, but it is necessary to tighten the central part of the carburetor cover, and this part is located near the cylinder. , carburetor, air cleaner, etc., and screw handles must be screwed into these locations. Normally, the engine is supported by a case via a vibration isolator such as rubber, and the engine swings relative to the case, so the carburetor is fixed to the cylinder, air cleaner, carburetor, etc. and swings together with the engine. The cover cannot be brought into contact with and supported by a stationary case, and therefore, conventionally, the carburetor cover has not been detachably attached using a single screw handle.

In this invention, a separate carburetor cover is attached to the cylinder cover that is fixed to the cylinder and covers the cylinder, and a separate carburetor cover is detachably attached to the air cleaner that is fixed to the carburetor using one screw handle.
By making the carburetor cover smaller, it is possible to use a fastener that is easy to tighten and release, and it is also possible to remove only the carburetor cover that covers the parts of the carburetor that are frequently inspected and maintained, making inspection and maintenance easier. The purpose is to provide a chainsaw that is easy to work with.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

In FIGS. 1 to 4, numeral 1 indicates a chain saw, which is constructed as follows. In other words, 3 connects to the engine 5 via a vibration isolator (not shown).
In this case, engine 5 is equipped with cylinder 7.
The axial center line is set almost vertically. A cylinder cover 9 covers the top of the cylinder 7, and is fixed to the cylinder 7 with screws (not shown), forming a cylinder chamber 11 inside. The cylinder cover 9 is formed separately from the case 3 with an appropriate gap, and is provided so as to be able to swing freely relative to the case 3. 1
3 is a carburetor cover that forms a carburetor chamber 17 adjacent to the cylinder chamber 11 via a partition wall 15 fixed to the cylinder 7; a carburetor 19 housed in the carburetor chamber 17; It is provided to cover the air cleaner 21 that is fixed to the
It abuts and closes the opening of the cylinder cover 9. Reference numeral 23 designates a saw chain that rotates around a bar 25 extending forward in the side of the case 3, and is rotationally driven by the engine 5 to cut trees and the like. 27 is a side plate that covers the base of the bar 25;
29 and 31 are a rear handle and a front handle fixed to the rear and upper part of the case 3, respectively; 33 is an accelerator lever provided on the rear handle 29; and 35 is a protection plate for protecting the operator's hand from flying fragments. be. 37 is a piston, 39 is a connecting rod that connects the piston 37 and the crank pin 40, 41 is a spark plug, and 42 is a yoke handle. Reference numeral 43 denotes an upwardly curved communication pipe which is fixed integrally with the carburetor 19, and a threaded cylinder 4 which is screwed into a stud bolt 45.
7 fixes the air cleaner 21, and the carburetor cover 13 is fixed to the air cleaner 21 via a spacer body 51 by a screw handle 49 that is screwed into the threaded cylinder 47. Further, the ignition plug 41 is provided to protrude from an ignition plug opening 53 provided in the cylinder cover 9 and is housed in an ignition plug chamber 55 provided in the carburetor cover 13. That is, the ignition plug opening 53 is closed by the carburetor cover 13 so as to be openable and closable. Reference numeral 57 denotes a ventilation hole provided in the partition wall 15, which guides air passing through the outer periphery of the cylinder 7 to the carburetor chamber 17. 59 is ventilation hole 5
It is an opening/closing plate for opening and closing 7, and there is a hole 6 in the lower half position.
1 is provided, and a locking piece 63 that protrudes in the vertical position,
63, it is removably engaged with the engagement hole 65 provided in the partition wall 15 and the edge of the ventilation hole 57. In FIG. 3, the hole 61 does not coincide with the ventilation hole 57;
7 is closed, but the opening/closing plate 59 is turned upside down and the locking pieces 63 are connected to the locking hole 65 and the ventilation hole 57.
When the hole 61 is locked to the edge of the vent hole 57, the hole 61 is aligned with the vent hole 57, and the vent hole 57 is configured to communicate with the vent hole 57.

In the above embodiment, the operator uses the rear handle 2
9. Grip the front handle 31 with both hands and use the saw chain 23, which is rotated by the engine 5, to cut a tree or the like. As the engine 5 rotates, air is filtered to remove dust through an air cleaner 21, mixed with vaporized fuel in a carburetor 19, and absorbed into the cylinder 7. When removing and cleaning dust accumulated in the air cleaner 21 or inspecting or adjusting the carburetor 19, loosen the screw handle 49, remove the carburetor cover 13, and then remove the screw tube 47. Since the air cleaner 21 can be removed by removing it, it is easy to install and remove the air cleaner 21, and inspection, maintenance, etc. are easy. Further, in order to inspect the ignition plug 41, only the carburetor cover 13 needs to be removed, and the inspection work is extremely simple.

Further, the carburetor cover that swings with the engine 5 comes into contact with the cylinder cover 9 that is fixed to the engine, and since an appropriate gap is provided between the cylinder cover 9 and the carburetor cover 13 with the case 3, the relative Even if it swings, it will not interfere with the case 3.

The opening/closing plate 59 is not allowed to pass through the outer periphery of the cylinder 7 by closing the ventilation hole 57 in the summer, as shown in FIG. 3, or by turning the opening/closing plate 59 upside down and locking it in the winter. The warmed air is sent into the carburetor chamber 17 to warm the carburetor 19, and the heated air is sucked into the air cleaner 21 to allow the engine 5 to operate smoothly.

5 and 6 show another embodiment, in which an opening/closing plate 67 is provided swingably around a shaft 69. FIG. Reference numeral 71 represents a handle fixed to the end of the shaft 69, and reference numerals 73 and 75 designate bracket portions that pivotally support the shaft 69. The handle 71 is locked by a locking device (not shown) for holding it in an appropriate rotational position. Further, the opening/closing plate is not limited to a removable type or a swing type, but may be of another type, such as a drawer type.

Since the present invention has the structure as described in the claims, it is possible to make the carburetor cover small, simplify the attaching/detaching mechanism, and facilitate inspection and maintenance of the carburetor and air cleaner. A screw handle can also be used by fixing it to the carburetor and can be easily attached and detached.

Furthermore, if the ignition plug is also formed to be opened and closed by the carburetor cover, inspection and maintenance of the ignition plug will be facilitated.

[Brief explanation of the drawing]

Fig. 1 is a perspective explanatory view of one embodiment of the present invention;
The figure is a side sectional view of the main part, Fig. 3 is a side sectional view of the opposite side, Fig. 4 is a perspective explanatory view of the main part, and Figs. 5 and 6 are sides of the main part of other embodiments. They are a sectional view and a plan sectional view. Explanation of the symbols representing the main parts of the drawing, 3...
Case, 5...Engine, 7...Cylinder, 9
... Cylinder cover, 11 ... Cylinder chamber,
13... Carburetor cover, 15... Bulkhead, 17...
Carburetor chamber, 19... Carburetor, 21... Air cleaner, 41... Spark plug, 43... Communication pipe, 49...
Screw handle, 53... Spark plug opening, 57...
Ventilation hole, 59...opening/closing plate.

Claims (1)

[Claims for Utility Model Registration] (1) The engine 5, in which the axis of the cylinder 7 is substantially perpendicular, is housed in the case 3 via a vibration isolator, and the cylinder 7 is covered and the engine 5 is connected to the case 3 as appropriate. A cylinder cover 9 formed separately with a gap is fixed to the cylinder 7 to form a cylinder chamber 11 therein, and the cylinder cover 9 covers the carburetor 19 fixed to the engine 5. An air cleaner 21 that fixes a carburetor cover 13 that closes an opening to the carburetor 19 via an upwardly curved communication pipe 43.
The carburetor chamber 17 is detachably fixed to the cylinder 7 by a single screw handle 49, and a carburetor chamber 17 is provided therein adjacent to the cylinder chamber 11 via a partition wall 15 fixed to the cylinder 7. Chainsaw to do. (2) A utility model in which the partition wall 15 is provided with a ventilation hole 57 for guiding air passing through the outer periphery of the cylinder 7 to the vaporizer chamber 17, and the ventilation hole 57 is provided with an opening/closing plate 59 that can be freely opened and closed. The chain saw described in registered claim (1). (3) A utility model registration request in which a spark plug opening 53 is provided in the cylinder cover 9 at a position corresponding to the spark plug 41, and the spark plug opening 53 is closed by the carburetor cover 13 so as to be openable and closable. The chain saw described in scope (1).