JPH0885913A - Tamper - Google Patents

Abstract

PURPOSE: To enhance the durability of a tamper by providing bellows at its uneven surface with a plurality of right-hand turning spiral ridges which intersect a plurality of left-hand turning spiral ridges, coupling the top and bottom of the bellows with the connecting end of the body part with the striking part, and enclosing the slide connection part of the body part with the striking part. CONSTITUTION: Bellows 20 are provided with a mesh-form embossed surface 29 over the whole internal circumference by forming protrusively at certain spacing a plurality of left-hand turning spiral ridges 30 and a plurality of right- hand turning spiral ridges 31 intersecting the left-hand ridges 30. One or more projections 33 are furnished on the internal surface of the cylindrical connecting end 32 at the top and bottom of the bellows 20. Recesses 34 in the identical number to be engaged by these projections 33 are furnished at the peripheral surface of the top 28a of a lower case 28 and the top 22a of an outer cylinder 22 where the connecting end 32 is in connection. The projections 33 and recesses 34 are fitted together, and a fastener band 35 is set as fastening the periphery of the connecting end 32.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a tamper that taps on an irregular ground such as a roadbed to compress it into a uniform plane, and more specifically, an upper main body composed of a driving part and a rotating part, and a bridge. The present invention relates to a configuration of a tamper in which a bellows for preventing twisting of a machine body is connected between a lower hitting portion including a pressure plate.

[0002]

2. Description of the Related Art A tamper generally used for compacting a roadbed or the like, as shown in FIG. 5, converts the driving force of a prime mover 1 into a reciprocating motion of a connecting rod 4 by a crankshaft 3 at a rotating part 2 to rotate the rotating part. In the outer cylinder 5 which is projected downward of 2,
An inner cylinder 8 protruding from a lower compression plate 7 is slidably fitted, and the lower end of a piston rod 6 which moves up and down by the reciprocating motion of the connecting rod 4 is inserted into both the inner and outer cylinders 8 and 5. An upper spring 10 whose upper end abuts on the upper surface of the inner cylinder 8 and a lower spring 11 whose lower end abuts on the lower surface of the inner cylinder 8 are arranged above and below a flange 9 provided at the lower end of the piston rod 6. ing.

The main body A of the motor 1 and the rotating portion 2 and the striking portion B of the compression plate 7 are the rotating portion 2
Since it is slidably connected by a connecting portion C consisting of an outer cylinder 5 projecting from the inner cylinder 8 and an inner cylinder 8 projecting from the compression plate 7, the outer side of this slidable connecting portion C is expanded and contracted by a bellows 12. It is hermetically sealed so that lubricating oil is stored in the inner space of the bellows 12 to provide sufficient lubricity to the connecting portion C and prevent dust from entering.

The slidable connecting portion C consisting of the outer cylinder 5 and the inner cylinder 8 is the inner cylinder 8
A key 14 provided on the outer cylinder 5 is engaged in a key groove 13 provided on the outer cylinder 5 so that the compression plate 7 does not rotate freely.

Further, in the conventional tamper of this type, the upper end of the bellows 12 and the connecting end of the main body A and the bellows 12 are connected.
The connection end between the lower end of the and the hitting portion B is, for example,
As shown in Japanese Patent No. 323 publication, each tightening band 1
It is integrally connected and fixed via 5.

[0006]

As described above, in the conventional tamper, the connecting portion C between the main body portion A and the striking portion B of the machine body is used.
Since the outer cylinder 5 and the inner cylinder 8 constituting the above are engaged with each other by the key 14 and the key groove 13,
Although the compression plate 7 does not rotate in spite of the intense vertical movement, the tamper originally compacts the uneven ground with the compression plate 7 flatly.
Due to the reaction force when the compression plate 7 hits the uneven slope surface of the ground portion, the connecting portion C between the outer cylinder 5 and the inner cylinder 8 is repeatedly subjected to the twisting action in the rotational direction.

[0007] When compacting an uneven ground having such irregularities, a slidable connection portion C between the main body portion A and the striking portion B is provided.
When a twisting action in the rotational direction due to a shock is applied to the inner and outer cylinders 8 and 5, the sliding contact surface between the key 14 and the key groove 13 is excessively loaded, wear becomes severe, and the accuracy of rubbing is reduced. Along with the decrease, the service life of the airframe is rapidly decreased.

Of course, such a decrease in durability due to wear of the sliding contact surface is more pronounced in a shorter time as the quality of the material forming the sliding contact portion and the processing accuracy are lower. When manufacturing the tamper, in order to prevent the inner and outer cylinders and the sliding contact parts such as the key and the key groove from being easily worn, especially, use high quality materials as parts and increase the processing accuracy. I needed to pay attention.

However, the tamper cannot avoid avoiding the twisting action of the connecting portion C in the process of the compaction of the uneven ground with the pressure plate. Even if the material quality of the connection part C between B and B is improved or the processing accuracy is improved, the connection part C
It cannot be an effective solution to prevent the deterioration of the durability of the.

Further, as described above, the upper end of the bellows 12 and the connecting end of the main body portion A and the connecting end of the lower end of the bellows 12 and the striking portion B are connected and fixed only by the tightening force of the tightening band 13. By doing so, no matter how tightly tightened by the tightening band 13, the connecting portion C between the main body portion A and the striking portion B is repeatedly subjected to the twisting action and vibration when compacting the rough ground, There is a problem that the mounting and fixing position shifts and bends without realizing it.

[0011]

In the present invention, as a means for solving the above-mentioned problems in the conventional tamper, in the related art, the connecting portion C between the main body portion A and the striking portion B is simply used.
Of the bellows, which covers the outside of the bellows to maintain the lubricity of the connection part C and to prevent the invasion of dust, and enhances the rigidity of the bellows to increase the rigidity of the bellows. An object of the present invention is to provide a tamper that exerts an anti-twisting function to reduce the twisting action on the connection portion C and can expect improvement in durability.

In this case, if the rigidity of the bellows is increased by means such as simply increasing the wall thickness so that the twisting action of the connecting portion C can be prevented, the rigidity of the bellows surely acts on the connecting portion C. Although the twisting action can be reduced, on the other hand, the elasticity of the bellows decreases as the wall thickness increases, hindering the smooth swing motion of the striking part B, and the weight of the machine body increasing to operate. It causes problems such as impaired sex.

In consideration of such a point, the invention of claim 1 does not impede the smooth amplitude motion of the striking part B, and the connecting part C.
As a concrete means for increasing the rigidity of the bellows to such an extent that the twisting action of the bellows can be prevented, a plurality of counterclockwise spiral ridges spaced from each other on the uneven surface of the bellows and these spiral ridges are provided. By forming a plurality of clockwise spiral ridges that intersect the ridges, a mesh-shaped protrusion surface is formed on the whole,
The upper and lower ends of the bellows are connected and fixed to the main body and the striking portion, and the connecting portion between the main body and the striking portion is hermetically covered.

According to a second aspect of the present invention, a mesh-like projection surface is formed on the inner peripheral surface of the bellows by a left-hand spiral spiral projection and a right-hand spiral projection, and the upper end of the bellows is connected to the main body. The end and the lower end of the bellows and the striking part connecting end are connected via a protrusion and a recess that engage with each other, and are fixed by a tightening band from the outside.

[0015]

In the tamper of the present invention, the concavo-convex surface of the bellows which covers the outside of the connecting portion C between the main body portion A and the striking portion B,
Since a plurality of left-handed spiral ridges and a plurality of right-handed spiral ridges intersecting these spiral ridges are projected to form a mesh-shaped projection surface, tightening of irregular ground When twisting in the direction of rotation acts from the striking part B to the connecting part C at the time of hardening, both the left-handed spiral ridge and the right-handed spiral ridge of the bellows resist twisting in the rotation direction. In addition, since the rigidity of the bellows is increased by the mesh-like projection surface formed on the entire surface due to the intersection of these spiral ridges, the bellows itself suppresses and prevents the twisting action, and the connection portion C Reduces twisting action.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the tamper according to the present invention will now be described with reference to the drawings. FIG. 1 shows a bellows for covering the outer circumference of a sliding connection portion C of a main body portion A and a striking portion B of the tamper. 2 is a partially cutaway perspective view showing the configuration of FIG. 20, and FIG. 2 is a partial cross-sectional view of a state in which the main body portion A of the tamper and the sliding connection portion C of the striking portion B are connected by the bellows 20.

As shown in FIG. 2, this tamper has a main body A for converting the driving force of a prime mover (not shown) into a reciprocating motion.
And a striking portion B having a pressure plate 21 on the lower surface and a sliding connecting portion C connecting the main body portion A and the striking portion B. The sliding connecting portion C is located below the main body portion A. An inner cylinder 23 that projects from the lower compression plate 21 is slidably fitted in the outer cylinder 22 that projects.

Further, in both the inner and outer cylinders 23, 22,
Piston rod 2 which moves up and down by the reciprocating motion of the main body A
4, the lower end of the piston rod 24 is inserted into the upper and lower sides of a flange 25 provided at the lower end of the piston rod 24, and the upper spring 26 whose upper end abuts the upper surface of the inner cylinder 23 and the lower spring 27 whose lower end abuts the lower surface of the inner cylinder 23. And are arranged.

Further, the upper end portion 22a of the outer cylinder 22 is
And the upper and lower ends 28a of the lower case 28 raised from the pressure plate 21 along the outer peripheral surface of the inner cylinder 23, the upper and lower ends of the bellows 20 are connected to fit the inner and outer cylinders 22 and 23. The outer peripheral surface of the sliding connection portion C is covered from the outside so as to be sealed, and the lubricating oil is stored inside.

The bellows 20, as shown in FIG.
A plurality of counterclockwise spiral ridges 3 that are spaced from each other on the inner peripheral surface
0 and a plurality of clockwise spiral ridges 31 intersecting these spiral ridges 30 are formed so as to form a mesh-shaped protrusion surface 29 on the whole, and the upper and lower ends are formed at both ends. Is the upper end 22a of the outer cylinder 22 and the lower case 28.
Is provided with a cylindrical connection end 32 that is connected to the upper end 28a of the.

In the above embodiment, the mesh-like projection surface 2 is formed by the spiral projections 30 and 31 in the left-right direction on the inner peripheral surface of the bellows 20.
9 is formed, the mesh-shaped projection surface 29 formed by the spiral ridges 30 and 31 may be provided on the outer peripheral surface of the bellows. It may be made smaller and provided on both the inner and outer surfaces.

One or a plurality of protrusions 33 are provided on the inner peripheral surfaces of the cylindrical connecting ends 32 at the upper and lower ends of the bellows 20, and the upper end portion of the outer cylinder 22 to which these cylindrical connecting ends 32 are connected. 22a and the upper end portion 28a of the lower case 28 are provided with the same number of recesses 34 that engage with the protrusions 33, respectively, and the cylindrical connecting end 32 is connected to the upper end portion 22a of the outer cylinder 22 and the lower case 28. Upper end 2
8A, the protrusion 33 and the recess 34 are fitted and connected so as to engage with each other, and the outer peripheral surface of the cylindrical connection end 32 is fastened and fixed by a fastening band 35.

In the above embodiment, the cylindrical connecting ends 32 of the bellows 20 are provided with protrusions 33, and the upper end portion 22 of the outer cylinder 22 to which these cylindrical connecting ends 32 are connected.
a and the upper case 28a of the lower case 28 are provided with the recesses 34, the cylindrical connection end 32 of the bellows 20 is provided with the recesses 34 so that the upper end 22a of the outer cylinder 22 and the lower case 28 are provided.
You may make it provide the protrusion 33 in the upper end part 28a of this.

[0024]

As described above, in the tamper according to the present invention, a plurality of counterclockwise spiral projections and a plurality of clockwise spiral projections intersecting with the spiral projections are formed on the uneven surface of the bellows. Since the protrusions are formed to form the mesh-shaped protrusion surface on the whole, even if the bellows body is thin enough not to impair the elasticity, the twist applied from the striking part B to the connecting part C In contrast to the action, the mesh-like projecting surface formed by the spiral ridges intersecting in the left-right direction exerts remarkably strong rigidity to prevent the rotational twisting action.

As a result, in the conventional case, only the connecting portion C directly receives the rotational twisting action applied from the striking portion B, but most of this twisting action is resisted and blocked by the bellows. As a result, it is possible to greatly reduce the wear damage caused by the twisting action of only the connecting portion C, and it is possible to greatly improve the durability.

The rigidity of the bellows is given by the mesh-like protruding surface. Since the mesh-like protruding surface is formed by the spiral protrusions in the left and right directions intersecting with each other, the bellows expands and contracts in the vertical direction. It is possible to deal with the sex relatively freely, and there is no adverse effect on the amplitude motion of the striking part B required for the function of the tamper, and there is no hindrance to the operability and stability. .

Further, the cylindrical connecting ends at the upper and lower ends of the bellows, and the connecting ends of the main body portion A and the striking portion B to which these cylindrical connecting ends are attached are respectively provided with protrusions and recesses for engagement. Since the respective connecting ends are connected via these concave and convex portions and then the outer side is fixed by the tightening band, even if the bellows is twisted by the impact from the striking part B, these connecting ends are fixed. Does not rotate easily, and a reliable connected and fixed state can be maintained for a long period of time.

Further, in the tamper of the present invention, since the bellows having increased rigidity can significantly suppress and prevent the twisting action by the striking portion B, conventionally, the outer cylinder and the inner cylinder forming the connecting portion C are formed. The key and the key groove, which are said to be indispensable as a rotation preventing mechanism for the above, can be eliminated, and an advantageous effect can be obtained that an economical product can be manufactured by reducing the number of parts.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing the structure of a bellows used in a tamper of the present invention.

FIG. 2 is a cross-sectional view of a tamper in which a main body portion and a striking portion are connected by the bellows of FIG.

FIG. 3 is a perspective view showing a configuration of a connection end between a bellows and a main body portion or a striking portion.

FIG. 4 is a cross-sectional view showing a configuration of a connection end between a bellows and a main body portion or a striking portion.

FIG. 5 is a sectional view showing the structure of a conventional tamper.

[Explanation of symbols]

A: body part B: striking part C: connection part 20: bellows 21: pressure plate 22: outer cylinder 23: inner cylinder 24: piston rod 25: flange 26: upper spring 27: lower spring 28: lower case 29: mesh shape Protrusion surface 30: Counterclockwise spiral ridge 31: Right spiral spiral ridge 32: Cylindrical connection end 33: Projection 34: Recess

Claims (2)

[Claims] 1. A tamper in which an outer periphery of a sliding connection portion C of a main body portion A and a striking portion B in which an outer cylinder 22 and an inner cylinder 23 are slidably fitted is covered and connected by a bellows 20. A plurality of counterclockwise spiral ridges 30 spaced from each other on the uneven surface and a plurality of clockwise spiral ridges 31 intersecting the spiral ridges 30 are projected to form a net-like structure as a whole. And the upper and lower ends of the bellows 20 are connected and fixed to the connecting ends of the main body A and the striking part B to hermetically cover the sliding connection part C of the main body A and the striking part B. Tamper characterized by having done. 2. A bellows 20 has a mesh-like protruding surface 29 formed by a left-hand spiral spiral ridge 30 and a right-hand spiral spiral ridge 31, and the upper end of the bellows 20 is connected to the main body A. The tamper according to claim 1, wherein the end and the lower end of the bellows 20 and the connection end of the striking portion B are connected via a protrusion 33 and a recess 34 that engage with each other, and are fixed from the outside by a tightening band.