Tool driving or impacting – Impacting devices – Hammer head constitutes piston of drive motor
Patent
1997-06-12
1999-03-23
Vo, Peter
Tool driving or impacting
Impacting devices
Hammer head constitutes piston of drive motor
173207, 91300, 91290, 91282, B25D 904, B25D 918
Patent
active
058847138
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a vibration generating apparatus that may be used in a breaker machine for carrying out a crushing operation, a road roller machine for carrying out a road rolling operation, and so forth.
BACKGROUND ART
As a vibration generating machine that can be used in a breaker machine, road roller machine and so forth, there has hitherto been known, for example, one that is disclosed in FIG. 1 of the drawings attached hereto.
More specifically, as shown in FIG. 1 it is seen that a unit body 1 has a piston 3 slidably inserted in a cylindrical bore 2 thereof. The said piston 3 is formed thereon with a large diameter portion 3a, a large diameter rod portion 3b and a small diameter rod portion 3c for defining with the correspondingly contoured surfaces of the said cylindrical bore 2 a first pressure receiving chamber 4 of a small pressure receiving area and a second pressure receiving chamber 5 of a large pressure receiving area, thus constituting a cylinder assembly 6. Further, a switching valve 9 is constructed by inserting a spool 8 slidably into a spool bore 7 of the said unit body 1 and defining a first pressure chamber 13 of a large diameter and a second pressure chamber 14 of a small diameter at both end sides of the said spool 8, respectively.
The above mentioned spool 8 is designed to establish and block a communication between a pump port 10, a principal port 11 and a tank port 12. Thus, the said spool 8 is thrusted to take a first position with a pressure fluid within the said first pressure chamber 13 of the large diameter to establish a communication between the said principal port 11 and the said tank port 12 and is thrusted to take a second position with a pressure fluid within the said second pressure chamber 14 of the small diameter to establish a communication between the said pump port 10 and the said principal port 11.
A servo valve 19 has a construction in which the above mentioned tank port 12 is normally allowed to communicate with a drain port 15 that is formed in the said cylindrical bore 2, the said first pressure chamber 13 is normally allowed to communicate with an auxiliary port 16 that is formed in the said cylindrical bore 2, and the said auxiliary port 16 is designed to establish and block, via a switching spool 17 that is integral with the said piston 3, a communication between the said drain port 15 and a first port 18. And, the said principal port 11 is allowed to communicate with a second port 20 whereas the said first port 18 and the said pump port 10 are supplied with a pressure fluid that is discharged from a hydraulic pump 21.
The above mentioned vibration generating apparatus is diagrammatically represented in FIG. 2 of the drawings attached hereto, in which the said first port 18 is shown as serving for both the said servo valve 19 and the said first pressure receiving chamber 4.
The above mentioned vibration generating apparatus will operate as set forth below.
When the said piston 3 is held at its neutral position as shown in FIGS. 1 and 2, the said spool 17 will act to block the said drain port 15, the said auxiliary port 16 and the said first port 18 so that the pressure fluid may be sealed within the said first pressure chamber 13. Then, the spool 8 (i.e. in the switching valve 9) will take a first position A to allow the said principal port 11 to communicate with the said tank port 12.
This will cause the said piston 3 to be moved in one direction (as shown by the arrow a) with the pressure fluid within the said first pressure receiving chamber 4. When it is so thrusted to take a position as shown in FIGS. 3 and 4, the said auxiliary port 16 will be allowed to communicate via a small diameter portion 17a of the said switching spool 17 with the said drain port 15 so that the pressure fluid may flow out of the said first pressure chamber 13 into a tank 22. The said spool 8 will then be thrusted to take a leftward position, i.e., a second position B as shown in FIG. 2, with the pressure within the said second pressure chamb
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patent: 5038668 (1991-08-01), Arndt et al.
patent: 5134989 (1992-08-01), Akahane
Ishizaki Naoki
Shinohara Shigeru
Komatsu Ltd.
Tugbang A. Dexter
Vo Peter
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