JP2557116Y2 - Variable exhaust cover device for driving machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a variable exhaust cover device capable of changing the exhaust direction of a driving machine driven by compressed air.

[Background of the invention]

FIG. 7 shows a driving machine equipped with a conventional exhaust cover 1.
A driving machine that reciprocates a striking piston (not shown) using compressed air as a power source generally has to discharge the compressed air flowing into the upper part of the striking piston to the atmosphere during the return stroke of the striking piston, and is an outlet for that. An exhaust port 8 is provided. At present, there is a driving machine capable of changing the exhaust direction as shown in FIG. 8 in order to prevent the exhaust from hitting the operator's face or dusting up depending on the work content.

The exhaust cover 1 in FIG. 8 is fixed by bolts 4 and further provided with an O-ring 6 in a gap between the exhaust cover 1 and the exhaust cover 3 so that the exhaust does not leak in other directions. However, in this structure, when changing the exhaust direction, the exhaust cover 1 cannot be rotated unless the bolts 4 are loosened, so that a tool is required each time, and the operation of changing the exhaust direction is troublesome.

FIG. 9 is proposed in Japanese Patent Application No. 2-84939 (Japanese Utility Model Application Laid-Open No. 4-42380) previously filed by the present applicant in view of the above point, and has a ring shape around the exhaust port 8 of the exhaust cover 3. The exhaust cover 1 is formed of an elastic material such as rubber, and the lip 9 of the exhaust cover 1 is press-fitted into the groove 10. Since the inner diameter of the lip 9 is smaller than the outer diameter of the groove 10,
There is a tightening margin for the elastic material, and the structure is such that exhaust gas does not leak in other directions. With this structure, the resistance when rotating the exhaust cover 1 is only due to the interference of the elastic material of the groove 10 and the lip 9 and can freely rotate over the entire circumference without tools. However, if the resistance due to the interference of the elastic material during the driving operation is small, there is a problem that the exhaust cover 1 is rotated by itself due to the vibration of the exhaust and the exhaust direction is changed. Increasing the tightening allowance of the material increases resistance and prevents rotation due to vibration. However, a large force is required when rotating the exhaust cover 1 to change the exhaust direction, and the operability is deteriorated. Was.

[Purpose of the invention]

The purpose of the present invention is to eliminate the above-mentioned disadvantages of the prior art,
It is an object of the present invention to improve the operability of this type of exhaust cover and prevent the exhaust cover from rotating due to the vibration of the exhaust.

[Outline of the invention]

The present invention has a convex portion, a plurality of exhaust ports which are provided below the convex portion and are opened outward in the radial direction, and a ring-shaped locking portion which is provided outside the exhaust port. The exhaust cover attached to the exhaust cover, the engaging portion having an inner diameter smaller than the outer diameter of the locking portion of the exhaust cover, the exhaust cover made of an elastic body having an opening provided in a part of the outer periphery and a plurality of notches. In addition, at least one concave portion and one convex portion that can be engaged with the facing surfaces of the exhaust cover and the exhaust cover are provided.

〔Example〕

One embodiment of the driving machine equipped with the exhaust cover 1 of the present invention is the first.
This is shown in FIGS.

As shown in FIGS. 1 and 2, the exhaust port 8 is provided on the upper part of the exhaust cover 3, and the exhaust cover 1 is formed of an elastic material such as rubber. Since the lip portion 9 of the exhaust cover 1 can be elastically deformed and press-fit into the locking groove portion 10, it does not jump out due to the pressure of the exhaust gas. Further, several convex portions are provided near the locking groove 10 of the exhaust port 8.
11 is formed, and a concave portion 13 is formed in the exhaust cover 1 so as to be able to engage with the convex portion 11.

FIG. 3 shows a convex portion 11 of the exhaust port 8 and a concave portion of the exhaust cover 1.
FIG. 13 is a cross-sectional view showing a state in which 13 is engaged. In this state,
Since the force for rotating the exhaust cover 1 by the vibration of the exhaust during the driving operation is smaller than the resistance of the concave portion 13 to ride on the convex portion 11, the exhaust cover 1 does not rotate.
When the exhaust direction is changed, as shown in FIG. 4, the recess 13 easily spreads due to the elastic deformation of the elastic material. The state returns to the state where the portion 11 and the concave portion 13 are engaged. This makes it possible to easily change the exhaust direction.

In the above embodiment, the convex portion 11 was formed on the outer periphery of the exhaust port 8 and the concave portion 13 was provided inside the exhaust cover 1 and engaged therewith. However, as shown in FIG. 5, the concave portion 16 was formed on the upper surface of the exhaust cover 3. In addition, a protrusion 15 may be provided on the exhaust cover 1 to enable engagement with the exhaust cover 1, and a recess 16 is provided on the upper surface of the protrusion of the exhaust cover 3 as shown in FIG. You may make it engage.

[Effect of the invention]

According to the present invention, an exhaust cover made of an elastic material such as rubber is provided, and the exhaust cover and the exhaust cover are engaged by the elasticity of the exhaust cover. The operation and tools are not required, and the exhaust cover can be easily rotated by the elastic deformation of the elastic material, so that the exhaust direction can be easily changed. Further, at least one concave portion and one convex portion engageable with the opposed surfaces of the exhaust cover and the exhaust cover are provided.
Since these are provided, it is possible to prevent the rotation of the exhaust cover caused by the vibration of the exhaust and the like during the driving operation and to prevent the change of the exhaust direction from being effected.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of the driving machine equipped with the variable exhaust cover device of the present invention, FIG. 2 is a longitudinal sectional view of a main part of FIG. 1, and FIGS. AA line sectional view, FIG. 5, FIG.
FIG. 7 is a longitudinal sectional view showing another embodiment of the main part of the present invention. FIGS. 7 and 8 are perspective and longitudinal sectional views showing an example of a driving machine equipped with a conventional exhaust cover device. FIG. 1 is a longitudinal sectional view showing an example of an exhaust cover device proposed by the present applicant before the present application. In the figure, 1 is an exhaust cover, 3 is an exhaust cover, 8 is an exhaust port, 11 is a convex portion, and 13 and 15 are concave portions.

Claims (1)

(57) [Scope of request for utility model registration] 1. A driving machine body having a built-in cylinder and piston, a convex portion, a plurality of exhaust ports provided below the convex portion, opened outward in the radial direction, and a ring-shaped provided outside the exhaust port. An exhaust cover having a locking portion, which is attached above the driving machine body, an engaging portion having an inner diameter smaller than an outer diameter of the locking portion of the exhaust cover, an opening provided in a part of the outer circumference, and a plurality of A driving machine provided with an exhaust cover made of an elastic body having a cutout portion, wherein at least one concave portion and one convex portion engageable with opposing surfaces of the exhaust cover and the exhaust cover are provided. A variable exhaust cover device for the embedded machine.