JPH02298476A - Stroke tool - Google Patents

Stroke tool

Info

Publication number
JPH02298476A
JPH02298476A JP11675189A JP11675189A JPH02298476A JP H02298476 A JPH02298476 A JP H02298476A JP 11675189 A JP11675189 A JP 11675189A JP 11675189 A JP11675189 A JP 11675189A JP H02298476 A JPH02298476 A JP H02298476A
Authority
JP
Grant status
Application
Patent type
Prior art keywords
piston
change
flow groove
sleeve
switching valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP11675189A
Inventor
Toshiyuki Yasumori
Original Assignee
Mazda Motor Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

Links

Abstract

PURPOSE: To obviate the necessity to equip a lot of branching passages for changing the stroke length of a piston by forming a flow groove communicating with a switching valve in order to change over the switching valve in a acting state capable of advancing a piston at the time when the piston is retreated in a specific distance on the face of the sliding side with the piston in a sleeve.
CONSTITUTION: When a sleeve 6 is moved in the axial direction of a piston 7 and the position is changed, a flow groove 6a formed on this sleeve 6 is also moved in the axial direction of the piston 7 and its position is changed. The change-over timing is varied in order to advance the piston 7 in a switching valve 1 by the position change of this flow groove 6a and the stroke length of the piston 7 becomes varied by the change of this timing. The need for equipping a lot of branching passages is obviated by making the stroke of the piston 7 variable by making one flow groove 6a movable like this.
COPYRIGHT: (C)1990,JPO&Japio
JP11675189A 1989-05-10 1989-05-10 Stroke tool Pending JPH02298476A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11675189A JPH02298476A (en) 1989-05-10 1989-05-10 Stroke tool

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11675189A JPH02298476A (en) 1989-05-10 1989-05-10 Stroke tool

Publications (1)

Publication Number Publication Date
JPH02298476A true true JPH02298476A (en) 1990-12-10

Family

ID=14694860

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11675189A Pending JPH02298476A (en) 1989-05-10 1989-05-10 Stroke tool

Country Status (1)

Country Link
JP (1) JPH02298476A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002512132A (en) * 1998-04-21 2002-04-23 アトラス コプコ ロツク ドリルス アクチボラグ Hammer apparatus
JP2009527370A (en) * 2006-02-20 2009-07-30 アトラス コプコ ロツク ドリルス アクチボラグ Impact device and rock drilling machine equipped with the percussion device
JP2012509199A (en) * 2008-11-20 2012-04-19 サンドビク マイニング アンド コンストラクション オサケ ユキチュアSandvik Mining And Construction Oy Breakers and axial bearing module
WO2015115105A1 (en) * 2014-01-30 2015-08-06 古河ロックドリル株式会社 Hydraulic hammering device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002512132A (en) * 1998-04-21 2002-04-23 アトラス コプコ ロツク ドリルス アクチボラグ Hammer apparatus
JP2009527370A (en) * 2006-02-20 2009-07-30 アトラス コプコ ロツク ドリルス アクチボラグ Impact device and rock drilling machine equipped with the percussion device
JP2012509199A (en) * 2008-11-20 2012-04-19 サンドビク マイニング アンド コンストラクション オサケ ユキチュアSandvik Mining And Construction Oy Breakers and axial bearing module
WO2015115105A1 (en) * 2014-01-30 2015-08-06 古河ロックドリル株式会社 Hydraulic hammering device

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