JPS5828777Y2 - chisel striking device - Google Patents

Description

[Detailed description of the invention] The present invention has a free piston 3 inserted into a movable cylinder 2 whose upper end is closed, which is reciprocated up and down within the main body cylinder 1, and which is movable up and down by a holder 4 at the lower end of the main cylinder 1. In a spiritual striking device in which a falling impact of a free piston 3 that moves up and down in accordance with the vertical movement of a movable cylinder 2 is added to a retainer 5 held by the retainer 5 to strike the outer cylinder 1a and the outer circumferential surface. A heat dissipation cylinder 1b having several heat dissipation ventilation grooves 8 cut therein and fitted and fixed into the outer cylinder 1a forms a main body cylinder 1, and both the inner and outer parts of the main body cylinder 1 above and below the movable cylinder 2 This is concerned with a beast striking device in which spaces are communicated through a heat radiation ventilation groove 8, and the object thereof is to provide a beast striking device which prevents seizure between a main body cylinder and a movable cylinder.

The present invention will be described in detail below based on illustrated embodiments.

As shown in FIG. 3, the upper part of the main body cylinder 1 includes a joint portion 21 that receives rotational power from an external power source via a flexible shaft, a spline shaft 22, a pinion gear 23, a helical gear 24, and a crank that is rotationally driven via these. 15 is provided.

25 is an oil tank, 26 is a gear case, 27 is a gear frame, and 28 is a holder flange.

A holder 4 is provided at the bottom of the main body cylinder 1 to hold the spirit 5 in a vertically movable manner.

This holder 4 has a cushioning material 16 between it and the main body cylinder 1.
It is composed of a holder nipple 4a for fixing the heron 5 and a holder camp 4b for preventing the heron 5 from being removed.

The main body cylinder 1 is composed of an outer cylinder 1a and a heat dissipation cylinder 1b fitted and fixed into the outer cylinder 1a. On the outer peripheral surface of the heat dissipation cylinder 1b, there are several heat dissipation ventilation grooves 8 vertically. are cut at equal intervals, and the upper and lower ends of the heat dissipation ventilation grooves 8 are cut into heat dissipation cylinders 1b, respectively.
The inside is communicated with through a heat radiation vent 17.

This heat dissipation ventilation groove 8 prevents the movable cylinder 2, which is vertically movable within the main body cylinder 1, from seizing up with the main body cylinder 1.

That is, this movable cylinder 2 has its upper end connected to the connecting rod 18.
is connected to the crank 15 by the crank 15.
When the movable cylinder 2 moves upwardly, the air in the upper space of the main cylinder 1 flows into the lower space of the main cylinder 1 through the heat dissipation ventilation groove 8.

When the movable cylinder 2 descends, compressed air flows from the lower space into the upper space through the heat radiation ventilation groove 8 due to the movement of the movable cylinder 2.

The air flowing through the heat radiation ventilation groove 8 cools the heat radiation cylinder 1b as well as radiates heat to the outside air via the outer cylinder 13, thereby preventing seizure with the movable cylinder 2.

In this way, a closed cooling system is constructed in which the air inside the main cylinder 1 cools the main cylinder 1, and the air inside the main cylinder 1 is cooled by the outside air with which the main cylinder 1 comes into contact. Therefore, there is no dust blowing into the main body cylinder 1.
This also prevents wear of the movable cylinder 2.

In addition, exhaust air due to air expansion and intake of fresh air are provided through the ventilation hole 3 equipped with a multiple filter 35 of the switch handle 34.
Start from 6.

The upper end of the movable cylinder 2 is closed and sealed,
In addition, a through hole 1 from which a lower hammer portion 9 of a free piston 3 inserted into the movable cylinder 2 projects is formed in the small diameter portion at the lower end.
9 is provided, and an 01J ring 29 is installed on the inner circumferential surface of the through hole 19 to make sliding contact with the hammer part 9 to close the lower end.

Reference numeral 30 denotes a sleeve attached to the upper and lower parts of the outer peripheral surface of the movable cylinder 2, which is made of a special alloy and has several grooves 31 cut in the longitudinal direction to prevent seizure with the heat dissipation cylinder 1b. -1 This reduces the contact area with the inner surface and serves as a circulation groove for air and lubricating oil, allowing the movable cylinder 2 to move up and down smoothly.

Reference numerals 10 and 11 denote an upper ventilation hole and a lower ventilation hole, respectively, which are bored in the approximate center of the movable cylinder 2, and both communicate the inside of the main body cylinder 1 and the inside of the movable cylinder 2, and each of them has a plurality of upper ventilation holes 10. And lower ventilation holes 11 are bored in the outer peripheral surface of the movable cylinder 2 in a single row and at the same intervals.

The free piston 3, which is fitted into the movable cylinder 2 so as to be slidable up and down, has a hammer part 9 with a reduced diameter at its lower part.

The hammer part 9 always projects from the through hole 19 at the lower end of the movable cylinder 2, and as described above, seals the through hole 19 by contacting the O ring 29 provided on the inner peripheral surface of the through hole 19.

Accordingly, depending on the position of the free piston 3 within the movable cylinder 2, the upper space and lower space of the movable cylinder 2 are opened or closed via the upper ventilation hole 10 and the lower ventilation hole 11, respectively.

That is, the upper ventilation hole 10 and the lower ventilation hole 11 are opened and closed by the vertical movement of the free piston 3 with respect to the movable cylinder 2, and when the free piston 3 is rising and passes through the upper ventilation hole 10, it reaches the top dead center. The air in the upper space inside the movable cylinder 2 is compressed to the maximum extent until the free piston 3 reaches the bottom dead center after closing and passing through the lower ventilation hole 11 when the free piston 3 is descending. The lower space within the movable cylinder 2 is compressed to the maximum extent, and the upper space and lower space within the movable cylinder 2 function as an upper air compression chamber 12 and a lower air compression chamber 13, respectively.

16 is the holder nipple 4 of the holder 4 as described above.
It is a cushioning material fixed to the main body cylinder 1 by a, and the upper part of the heron 5 is inserted through it, and has a spring seat 33 on the lower surface.

A compression coil spring 6 is installed below the cushioning material 16, and the upper end of the compression coil spring 6 contacts the spring seat 33 of the cushioning material 16, and the lower end contacts the upper surface of the flange 14 provided on the heron 5. are in contact with each other.

This compression coil spring 6 always makes the zero 5 spring downward, or conversely, makes the main body mechanism spring upward against the beast 5, and the beast 5 always springs the free piston 3 at a constant rhythm. This is what I am trying to attack.

Next, the operation will be explained based on FIG.

Figures a to d show the start-up, and when the lower end of the beast 5 hits a surface to be crushed, such as a road paved surface, the compression coil spring 6 is compressed by the weight of the body, and the beast 5 moves upwards relatively. When the movable cylinder 2 moves upward due to the rotation of the crank 15, the free piston 3 also rises accordingly, reaches the top dead center, and the movable cylinder 2 begins to descend, and the free piston 3 also begins to descend.

When moving downward, before the movable cylinder 2 reaches the bottom dead center, as shown in FIG.

The movable cylinder 2 further descends and reaches the bottom dead center before entering the upward stroke, but the free piston 3 is compressed by the reaction force of the collision with the cylinder 5 and by the descent of the free piston 3 in the lower air compression chamber 13. It is accelerated by the expansion force and begins its upward stroke.

Since the rising speed of the free piston 3 is higher than the rising speed of the movable cylinder 2, the free piston 3 passes through the upper ventilation hole 10 provided in the movable cylinder 2, closes it, and rises further, and the upper air compression chamber is closed. While compressing the air in the upper air compression chamber 12, the upper air compression chamber 12 reaches the top dead center as shown in e and f in the figure.
The maximum compression value is the air inside.

When the movable cylinder 2 moves downward, the free piston 3 is given acceleration in addition to the downward speed of the movable cylinder 2 by the expansion force of the compressed air, closing the lower vent hole 11 and opening the upper vent hole 10. While doing this, he descends and hits the 5-stroke as shown in gsh in the same figure.

After striking 5, the state moves from the same pattern to the state shown in the figure e, and the cycle between e and h in the figure is repeated.

As mentioned above, in this invention, a heat dissipation ventilation groove is formed inside the main body cylinder to communicate the upper and lower spaces in the main cylinder 1 of the movable cylinder. The upper space and the lower space with a In addition, the main body cylinder is formed of an outer cylinder and a heat dissipation cylinder that is inserted and fixed into the outer cylinder, and heat dissipation ventilation grooves are cut on the outer surface of the heat dissipation cylinder. Therefore, it is easy to form the heat dissipation ventilation groove within the wall thickness of the main body cylinder, and the direct contact area between the heat dissipation cylinder, whose inner surface is in sliding contact with the movable cylinder, and the air flowing through the heat dissipation ventilation groove is large. Cooling by air is performed efficiently, and since the main cylinder is formed of an outer cylinder and a heat radiation cylinder, mechanical and thermal loads are not applied to the outer layer and inner layer of the main cylinder, respectively. It is easy to use appropriate materials for each, and the durability can be improved.

In addition, since the main body cylinder is cooled from within, the cooling efficiency is high, and since it is sufficient to radiate heat from the main cylinder to the outside air and use the air inside the main cylinder, a closed cooling system can be configured, and the introduction of external air is sufficient. This prevents wear and tear on the main body cylinder and movable cylinder due to dust being sucked in due to the heat dissipation, and since the air flowing through the heat dissipation ventilation groove is compressed air, it helps the movable cylinder move up and down and generates power. This has the advantage of also reducing the driving load on the source.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention, FIG. 2 is a cross-sectional view of the same, FIG. 3 is a longitudinal sectional view of the head portion of the same, and FIG. 4 is an explanatory diagram of the operation of the same. 1 is the main cylinder, 1a is the outer cylinder, 1b is the heat radiation cylinder, 2 is the movable cylinder, 3 is the free piston,
4 indicates a holder, 5 indicates a spirit, and 8 indicates a heat dissipation ventilation groove.

Claims (1)

[Scope of utility model registration request] A free piston is inserted into a movable cylinder that is reciprocated up and down inside the main cylinder, and is held by a holder at the bottom end of the main cylinder so that it can move up and down.The falling impact of the free piston, which moves up and down in response to the up and down movement of the movable cylinder. In the spirit striking device, which is designed to strike by adding it to the stem, there is a heat dissipation cylinder with several heat dissipation ventilation grooves cut vertically on the outer circumferential surface of the outer cylinder and the heat dissipation cylinder that is inserted and fixed into the outer cylinder. A spirit striking device formed by forming a main body cylinder, and communicating the white space of the main cylinder above and below the movable cylinder via a heat dissipation ventilation groove.