WO1997024744A1 - Commutateur a pression pour pompe hydraulique - Google Patents
Commutateur a pression pour pompe hydraulique Download PDFInfo
- Publication number
- WO1997024744A1 WO1997024744A1 PCT/JP1996/003654 JP9603654W WO9724744A1 WO 1997024744 A1 WO1997024744 A1 WO 1997024744A1 JP 9603654 W JP9603654 W JP 9603654W WO 9724744 A1 WO9724744 A1 WO 9724744A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pressure
- plunger
- plug
- sleeve
- hydraulic
- Prior art date
Links
- 238000013016 damping Methods 0.000 claims abstract description 14
- 125000006850 spacer group Chemical group 0.000 claims description 22
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 239000003921 oil Substances 0.000 description 17
- 238000003754 machining Methods 0.000 description 13
- 238000000034 method Methods 0.000 description 11
- 238000004519 manufacturing process Methods 0.000 description 9
- 241001634822 Biston Species 0.000 description 3
- FFGPTBGBLSHEPO-UHFFFAOYSA-N carbamazepine Chemical compound C1=CC2=CC=CC=C2N(C(=O)N)C2=CC=CC=C21 FFGPTBGBLSHEPO-UHFFFAOYSA-N 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000004512 die casting Methods 0.000 description 2
- 239000010720 hydraulic oil Substances 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 230000010485 coping Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H35/00—Switches operated by change of a physical condition
- H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
- H01H35/38—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by piston and cylinder
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H35/00—Switches operated by change of a physical condition
- H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
- H01H35/26—Details
- H01H35/2607—Means for adjustment of "ON" or "OFF" operating pressure
- H01H35/2614—Means for adjustment of "ON" or "OFF" operating pressure by varying the bias on the pressure sensitive element
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H35/00—Switches operated by change of a physical condition
- H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
- H01H35/26—Details
- H01H35/2607—Means for adjustment of "ON" or "OFF" operating pressure
- H01H35/2628—Means for adjustment of "ON" or "OFF" operating pressure by varying the relative position of switch-casing and pressure sensitive element
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H35/00—Switches operated by change of a physical condition
- H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
- H01H35/26—Details
- H01H35/2685—Means to protect pressure sensitive element against over pressure
Definitions
- the present invention relates to a pressure switch for a hydraulic pump, and more particularly to an improvement in a pressure switch used for a vane pump that is optimal as a hydraulic source for a vehicle power steering device or the like.
- the engine as a drive source of such a vane pump may cause engine stall due to a load increase caused by steering, particularly during idling.
- a pressure switch has been adopted to detect changes in the discharge pressure (supply pressure) accompanying steering during idling and to increase the engine idle speed.
- the body 100 of the pressure switch accommodates a vane pump cartridge (not shown) and is electrically grounded.
- the recess 100 A of the body 100 communicates with the pump discharge (high pressure) side via a high pressure passage 120 and the pump suction (low pressure) side via a low pressure passage 130. ing. Further, the recess 100A is screwed through a plug 102 formed on the outer periphery of the plug 102.
- the plug 102 has a through hole 102A at a substantially central portion thereof.
- the inner periphery of the through-hole 102A is guided through insulating members 105, 107 and 0-ring 106.
- the electrically conductive terminal 103 is insulated and supported. Further, the terminal 103 is fixed to the plug 102 by the push nut 104.
- a conductive biston 110 and a plunger 109 that can be displaced in the axial direction in opposition to the terminal 103 are accommodated in the small diameter portion 100B of the recess 100OA. Further, between the plunger 109 and the terminal 103, a spring 111 for urging them in the separating direction is interposed.
- the piston 110 moves toward the base end by receiving the thrust by the hydraulic pressure of the high-pressure passage 120, and abuts on the distal end with the plunger 109.
- the hydraulic pressure applied to the high pressure passage 120 exceeds a predetermined value
- the plunger 109 pressed by the piston 110 is displaced upward in the drawing against the urging force of the spring 111.
- the plunger 109 and the terminal 103 come into contact.
- the terminal 103 becomes conductive through the body 100, the piston 110 and the plunger 109, the circuit connected to the terminal 103 is turned on, and the supply pressure of the vane pump is increased. Detects that the specified value has been exceeded.
- the oil chamber 101 defined between the plunger 109 and the plug 102 communicates with the low-pressure passage 130 of the vane pump.
- the terminal 103, the spring 111, the plunger 109, and the biston 110 are composed of separate parts, these parts are used when assembling the pressure switch. Must be sequentially incorporated in a predetermined order. For this reason, not only the number of steps in the assembling process is increased, but also there is a possibility that erroneous assembly may occur.
- a small and long high-pressure passage 120, a small-diameter portion 100 for accommodating a small-diameter biston 110 and a plunger 109 having a guide flange portion are provided.
- Each of B must be machined and the high pressure passage 120 axis It is necessary to finish the low-pressure passage 130 obliquely with respect to by machining. For this reason, the number of processing steps increases and the manufacturing cost increases.
- the insulation plug 204 supporting the terminal 212 is connected to the conductive case 201. Furthermore, the plunger 208 accommodated in the conductive case 210] displaces in stroke in accordance with the hydraulic pressure applied to the hydraulic pressure introducing hole 205A, and the piston 2 abuts on one end of the plunger 208. 1 0 force Contact with terminal 2 1 2.
- an orifice member 220 having a small diameter damping orifice is interposed between the conductive case 201 and the pump body 200.
- a pressure chamber 205B is defined between the hydraulic pressure introduction hole 205A and the plunger 208, and unnecessary switching due to a change in the supply pressure is prevented.
- the pressure switch shown in FIG. 10 has a structure in which the damping orifice member 220 is interposed between the body 200 and the case 201, so that the damping orifice member 220 It is difficult to insert the cable into the body opening so that it does not tilt, and there is a problem that the assemblability and productivity are reduced. In addition, there is a possibility that the assembling of the damping gap member 220 may be forgotten.
- the plunger 208 and the piston 210 are formed as separate parts, even if the case 201 and the plug 204 are pre-assembled as a subassembly, the plunger 20 When assembling 8 to the body 200, Dropping was easy to occur. For this reason, an increase in the number of assembling man-hours and confirmation work were required, which was one of the factors that drastically reduced productivity.
- the present invention has been made in view of such a problem of the conventional pressure switch, and reduces a man-hour for machining on the body side as much as possible, and a pressure switch of a hydraulic pump that can be easily and securely assembled. It is intended to provide.
- Another object of the present invention is to provide a pressure switch of a hydraulic pump that has a good response to a hydraulic pressure and operates reliably. Disclosure of the invention
- a recess formed in a body of an electrically grounded hydraulic pump, a hydraulic introduction hole for guiding a discharge pressure of the pump to the recess, and a fitting in the recess so as to seal the opening of the recess.
- a plug which is supported by the plug in an insulated state and serves as an output terminal for an electric signal; and a conductive member which is displaced according to the oil pressure from the oil pressure introduction hole side and can contact the terminal.
- a hydraulic pressure pump for turning on and off an electric signal when the terminal comes into contact with the plunger; a tubular portion formed on the plug and opening toward a concave portion of the body.
- the contacts of the pressure switch are all united inside the plug, when attaching this plug to the body, fit the lower end of the sleeve into the opening of the hydraulic pressure introduction hole. All that is required is to screw the outer peripheral thread portion of the plug into the concave thread portion of the body. Therefore, in the assembly process of the hydraulic pump, as in the above-described conventional example, it is not necessary to perform complicated work such as sequentially assembling a plurality of parts constituting the pressure switch. However, the components do not fall off, and the pressure switch can be easily and reliably assembled, so that the number of steps in the assembly process of the hydraulic pump can be greatly reduced.
- an inspection process for coping with erroneous assembly as in the above-described conventional example is not required, so that productivity can be improved and manufacturing cost can be significantly reduced.
- the plug is configured as a sub-assembly that has no relation to the hole machining accuracy of the pump body and the fitting base accuracy of the plunger at the contact point, various types of fitting accuracy between the body and the plug are ensured. There is no need for advanced processing control, and the reliability of the pressure switch can be improved.
- a female screw is formed on the inner periphery of the concave portion
- a male screw is formed on the outer periphery of the plug, so that the axis of the concave portion and the axis of the hydraulic pressure introducing hole coincide with each other.
- the present invention may be configured such that a notch portion for releasing the internal pressure of the plug is formed at a predetermined position of the sleeve, and a low-pressure passage communicating with the notch portion is formed in a concave portion of the pump body.
- the low-pressure passage and the hydraulic pressure introduction hole are arranged substantially in parallel.
- the low-pressure passage and the hydraulic pressure introduction hole are disposed substantially parallel to each other, in the case of molding by die casting, the concave portion, the hydraulic pressure introduction hole and the low-pressure passage can be simultaneously punched out, and the hydraulic pump body is formed. It is possible to further reduce the number of machining steps after molding and further reduce the manufacturing cost.
- the sleeve includes a cylindrical flange portion in which the cutout portion is formed, and includes a disk-shaped spacer interposed between the flange portion and the plunger.
- the notch two faces parallel to the opposite cylindrical side faces of the flange are formed, and a plurality of notches are formed along the outer periphery of the spacer.
- FIG. 1 is a cross-sectional view of a pressure switch showing one embodiment of the present invention.
- FIG. 2 shows a cross-sectional view of the plug alone.
- FIG. 3 is a sectional view of a concave portion of a body to which a plug is similarly mounted before machining.
- FIG. 4 is a cross-sectional view of the same recess after machining.
- FIG. 5 is a plan view showing the same sleeve.
- FIG. 6 is a plan view showing the spacer similarly.
- FIG. 7 is a plan view showing a sleeve and a spacer which are also superimposed.
- FIG. 8 is a plan view showing a sleeve and a spacer which are also overlapped.
- FIG. 9 is a cross-sectional view of a conventional pressure switch.
- FIG. 10 is a sectional view of a pressure switch showing another conventional example. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 to 4 show one embodiment of a pressure switch to which the present invention is applied.
- the pump body houses the vane pump cartridge and is electrically grounded.
- a concave portion 10 is formed at a predetermined position of the body 1 so as to tie the plug 2 constituting the pressure switch.
- a high-pressure hydraulic pressure introduction hole 20 communicating with the discharge side of the pump cartridge opens substantially coaxially in the recess 10, while a low-pressure passage 30 formed in parallel with the hydraulic pressure introduction hole 20 also opens.
- the plug 2 attached so as to cover the concave portion 10 includes a cylindrical portion 41 that opens toward the concave portion 10.
- a male screw 2 a is formed on the outer periphery of the cylindrical portion 41, and the plug 2 is threaded through the male screw 2 a to a large-diameter portion 11 having a female screw on the inner periphery of the recess 10. I do.
- a ring 8 is interposed between the plug 2 and the body 1 outside the external thread 2a.
- a terminal 3 is insulated and supported at a substantially central portion of the plug 2 via an insulating member 5, an O-ring 6, and an insulating member 7. This terminal 3 is connected to an electric circuit (not shown). The drop in Terminal 3 is prevented by Pushnut 4.
- the flange part 15 of the sleeve 15 is fitted into the cylindrical part 4 b of the inner part of the plug 2 by press fitting.
- the sleeve 15 is provided with a damping orifice 15a communicating with the hydraulic pressure introduction hole 20.
- the plunger 14 that responds to the oil pressure of the hydraulic pressure introduction hole 20 guided through the damping orifice 15a is axially moved. It is displaceably supported.
- the plunger 14 and the sleeve 15 are made of a conductive material.
- the plunger 14 includes a small-diameter portion 14a and a large-diameter portion 14b, and the small-diameter portion 14a fits on the inner circumference of the sleeve 15 so as to be in contact with the inner circumferential surface of the sleeve 15. While being in sliding contact, the large part 14 b is fitted into the large diameter part 2 b of the cylindrical part 41 and makes sliding contact with the inner peripheral surface of the large part 2 b.
- a spring 9 that opposes the hydraulic pressure in the hydraulic pressure introduction hole 20 is interposed between the large-sized part 14 b and the bottom part 42 of the plug 2 to urge the plunger 14.
- the inner circumference of the sleeve 15 is provided with an O-ring 18 which is in sliding contact with the small diameter portion 14a of the plunger 14. This suppresses leakage of pressure oil from the damping orifice 15a side to the inner periphery of the cylindrical portion 41 of the plug 2 while applying a predetermined frictional force to the plunger 14 displaced in the axial direction. .
- An oil chamber 19 is defined between the lower end of the small diameter portion 14 a of the plunger 14 and the opening of the damping orifice 15 a of the sleeve 15.
- a cut-out portion 15b is provided on the outer periphery of the flange portion 15c of the sleeve 15 to communicate the low-pressure passage 30 with the inner periphery of the cylindrical portion 41 of the plug 2. Further, a spacer for preventing the O-ring 17, which will be described later, from being provided between the sleeve 15 and the stepped portion 2 c formed on the cylindrical portion 41 facing the large-diameter portion 2 b side. 16 are interposed.
- a notch 16 a is formed at a predetermined position of the spacer 16, and the spacer 16 is arranged such that the notch 1.6 a faces the notch 15 b of the sleeve 15. It is attached. Thereby, the pressure oil leaked from the sliding surface of the plunger 14 through the notch 16a and the notch 15b is guided to the low-pressure passage 30.
- FIGS. 5 to 8 show an embodiment of a cutout portion 15b formed in the sleeve 15 and a cutout 16a provided in the spacer 16.
- the flange 15 of the sleeve 15 is formed with a pair of cutouts 15b in which two opposite sides of the sleeve 15 are cut in parallel.
- the spacers 16 are formed adjacent to each other at substantially equal angles (approximately 120 degrees) with three notches 16a having a substantially semicircular cross section.
- the cutout portion 15b and the cutout 16a maintain a substantially constant communication state regardless of the positional relationship in the rotation direction. That is, as shown in FIGS. 7 and 8, for example, even if the rotational angle of the notch 15b and the notch 16a is different from each other, the notch 15b As a passage 50 consisting of a portion where the notch 16a communicates with the notch 16a, a region of approximately the same size can be secured.
- the notch 15b and the notch 16a are not intentionally aligned in the rotational direction, oil leaking from the sliding surface of the plunger 14 can be transferred to the low-pressure passage 30.
- the passage formed by the notch portion 15b and the notch 16a to be guided is always formed with substantially the same size.
- the unit of the pressure switch having the above configuration is assembled in advance so that the sleeve 15 protrudes from the open end of the cylindrical portion 41 of the plug 2 as shown in FIG.
- the concave portion 10 of the body 1 is located at the opening of the hydraulic pressure introducing hole 20 opening to the large-diameter portion 11 and is fitted to the lower end of the sleeve 15.
- a small part 12 is formed. Further, on the outer periphery of the sleeve 15 fitted to the small portion 12, there is provided a 0 ring 17 force for suppressing leakage of pressurized oil from the hydraulic pressure introduction hole 20. Next, the operation will be described.
- the pressure oil from the hydraulic pressure introduction hole 20 is guided to an oil chamber 19 in the sleeve 15 via a damping orifice 15a.
- the thrust force against the plunger 14 by the hydraulic pressure becomes larger than the urging force of the spring 9
- the plunger 14 is displaced upward in the drawing, and the upper end of the plunger 14 and the terminal 3 come into contact.
- the grounded body 1 and terminal 3 become conductive, and the electric signal becomes ON.
- the hydraulic oil leaking from the sliding surface between the small diameter portion 14a of the plunger 14 and the inner periphery of the sleeve 15 to the inner periphery of the cylindrical portion 41 of the plug 2 is cut into the cutout formed in the spacer 16 Through the gap formed by the tapered surface formed on the flange portion 15c of the sleeve 15 from the notch portion 16a, the flow returns to the low-pressure passage 30 from the notch portion 15b formed on the sleeve # 5. Also, the hydraulic oil leaked from the O-ring 17 interposed between the sleeve 15 and the fitting base surface of the body 1 also returns to the low-pressure passage 30 from the bottom of the recess 10.
- the plug 2 constituting the pressure switch is assembled to the body 1 of the hydraulic pump by a small diameter in which the lower end of the sleeve 15 is formed coaxially with the opening of the hydraulic pressure introduction hole 20. It is only necessary to fit the male screw 2a into the female screw formed in the large-sized part 11 of the body "1 while fitting the male screw 2a into the female screw 12. Therefore, as in the conventional example, the hydraulic pump In the assembling process, there is no need to perform complicated work such as sequentially assembling a plurality of parts constituting the pressure switch, and the spring 9 and the plunger 14 are sealed as a sub-assembly in advance so that they are sealed with the sleeve 15. Since only the plugs 2 assembled in a separate process are screwed together, there is no erroneous assembling or dropout of components as in the conventional example.
- the cutout portion 15b of the sleeve 15 is formed into two parallel chamfers as shown in FIG. 5, and the cutout 16a of the spacer 16 is shown in FIG. If a notch with a substantially semi-circular cross section formed at three places at an even angle is used, the notch 15 b can be obtained regardless of the angle of rotation of the sleeve 15 and spacer 16.
- a passage 50 communicating with the low-pressure passage 30 composed of the notch 16a and the notch 16a is always formed with the same size. Therefore, in the operation of superposing the sleeve 15 and the spacer 16 on each other, it is not necessary to control the mounting angle, and the superposition operation is extremely easy. It is easily done.
- the present invention it is possible to easily and surely assemble the components of the pressure switch, greatly reducing the number of steps in the assembly process of the hydraulic pump, and improving the error as in the conventional example. Inspection processes, etc. to deal with assembly are not required, so that productivity can be improved and manufacturing costs can be significantly reduced, and the reliability of pressure switches can be improved. .
- the pressure switch is assembled by screwing the plug 2, the automation of the assembly process using a robot or the like can be easily promoted.
- the axis of the hydraulic pressure introduction hole 20 is aligned with the axis C a of the concave portion 10 of the body 1 and the axis C b of the low pressure passage 30 is hydraulically introduced.
- the hydraulic pressure introducing hole 20 and the low-pressure passage 30 can be punched and formed by die punching at the time of die casting. Then, as shown in FIG. 4, this machining is performed with a female screw for screwing the plug 2 on the inner periphery of the large-diameter portion 11 and a small-diameter portion 1 for receiving the lower end of the sleeve 15.
- the pressure switch of the hydraulic pump according to the present invention is useful as a pressure switch employed in a vane pump, and can reduce the number of machining steps on the body side as much as possible and assemble easily and securely. It is possible, and it is suitable for improving operating performance.
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Switches Operated By Changes In Physical Conditions (AREA)
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1019980704926A KR100313656B1 (ko) | 1995-12-27 | 1996-12-13 | 유압 펌프용 압력 스위치 |
US09/091,743 US5990428A (en) | 1995-12-27 | 1996-12-13 | Pressure switch for hydraulic pump |
DE19681706T DE19681706C2 (de) | 1995-12-27 | 1996-12-13 | Druckschalter und Druckschalteranordnung in einer Hydraulikpumpe |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7/352044 | 1995-12-27 | ||
JP35204495A JP3916684B2 (ja) | 1995-12-27 | 1995-12-27 | 油圧ポンプの圧力スイッチ |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997024744A1 true WO1997024744A1 (fr) | 1997-07-10 |
Family
ID=18421401
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1996/003654 WO1997024744A1 (fr) | 1995-12-27 | 1996-12-13 | Commutateur a pression pour pompe hydraulique |
Country Status (5)
Country | Link |
---|---|
US (1) | US5990428A (ja) |
JP (1) | JP3916684B2 (ja) |
KR (1) | KR100313656B1 (ja) |
DE (1) | DE19681706C2 (ja) |
WO (1) | WO1997024744A1 (ja) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100369787B1 (ko) * | 2000-04-20 | 2003-02-05 | 주재석 | 압력스위치 |
KR100449185B1 (ko) * | 2001-03-05 | 2004-09-18 | 한국델파이주식회사 | 파워스티어링장치의 유압펌프용 압력스위치 |
KR20050122035A (ko) * | 2004-06-23 | 2005-12-28 | 주식회사 만도 | 유압식 조향장치의 유압감지용 압력스위치 |
US7605336B2 (en) * | 2007-08-30 | 2009-10-20 | Honeywell International Inc. | Pressure switch with adjustable differental setting |
KR101338420B1 (ko) * | 2007-09-18 | 2013-12-10 | 현대자동차주식회사 | 파워스티어링장치의 유압펌프용 압력스위치 |
KR200448460Y1 (ko) * | 2008-06-24 | 2010-04-13 | 영신정공 주식회사 | 압력스위치 및 이를 갖는 조향펌프 |
CN105927531A (zh) * | 2016-05-11 | 2016-09-07 | 安徽江淮汽车股份有限公司 | 动转泵总成 |
CN116164142B (zh) * | 2022-12-01 | 2023-11-14 | 浙江力夫自控技术股份有限公司 | 一种耐压式压力开关 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6136040Y2 (ja) * | 1981-04-06 | 1986-10-20 | ||
JPS6257352U (ja) * | 1985-09-30 | 1987-04-09 | ||
JPH01165542U (ja) * | 1988-05-11 | 1989-11-20 | ||
JPH01168935U (ja) * | 1988-05-19 | 1989-11-29 | ||
JPH0376345U (ja) * | 1989-08-09 | 1991-07-31 | ||
JPH0512968A (ja) * | 1991-06-28 | 1993-01-22 | Matsushita Refrig Co Ltd | 圧力スイツチ |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2219928A1 (de) * | 1972-04-22 | 1973-10-31 | Teves Gmbh Alfred | Ventil fuer die betaetigung eines elektrischen schalters (druckschalter) |
DE7407137U (de) * | 1974-03-01 | 1974-06-20 | Fichtel & Sachs Ag | Druckschalter für hohe Drücke |
JPH0828768B2 (ja) * | 1985-09-05 | 1996-03-21 | 松下電器産業株式会社 | 通話装置 |
DE3603059A1 (de) * | 1986-02-01 | 1987-08-06 | Scheuffele Robert Gmbh Co Kg | Druckschalter |
DE8703595U1 (de) * | 1987-03-10 | 1987-07-16 | Hamke, Herbert, 32584 Löhne | Elektrohydraulischer oder pneumatischer Schalter |
DE3710645A1 (de) * | 1987-03-31 | 1988-10-20 | Delaval Turbine Gmbh | Druckschalter |
US4752658A (en) * | 1987-06-22 | 1988-06-21 | Caterpillar Inc. | Pressure checked electrical pressure switch |
JPH01168935A (ja) * | 1987-12-23 | 1989-07-04 | Yoshinobu Miyata | 除電性パイル織物 |
JP2530675B2 (ja) * | 1987-12-23 | 1996-09-04 | 三菱化学株式会社 | カルボン酸類の製造方法 |
JPH0376345A (ja) * | 1989-08-18 | 1991-04-02 | Furukawa Electric Co Ltd:The | データ伝送方式 |
JP2544075Y2 (ja) * | 1990-10-23 | 1997-08-13 | 株式会社ユニシアジェックス | 圧力スイッチ |
JP2603402Y2 (ja) * | 1992-03-30 | 2000-03-13 | 株式会社ユニシアジェックス | 圧力スイッチ |
-
1995
- 1995-12-27 JP JP35204495A patent/JP3916684B2/ja not_active Expired - Lifetime
-
1996
- 1996-12-13 KR KR1019980704926A patent/KR100313656B1/ko not_active IP Right Cessation
- 1996-12-13 US US09/091,743 patent/US5990428A/en not_active Expired - Lifetime
- 1996-12-13 WO PCT/JP1996/003654 patent/WO1997024744A1/ja active IP Right Grant
- 1996-12-13 DE DE19681706T patent/DE19681706C2/de not_active Expired - Lifetime
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6136040Y2 (ja) * | 1981-04-06 | 1986-10-20 | ||
JPS6257352U (ja) * | 1985-09-30 | 1987-04-09 | ||
JPH01165542U (ja) * | 1988-05-11 | 1989-11-20 | ||
JPH01168935U (ja) * | 1988-05-19 | 1989-11-29 | ||
JPH0376345U (ja) * | 1989-08-09 | 1991-07-31 | ||
JPH0512968A (ja) * | 1991-06-28 | 1993-01-22 | Matsushita Refrig Co Ltd | 圧力スイツチ |
Also Published As
Publication number | Publication date |
---|---|
DE19681706C2 (de) | 2001-03-01 |
JP3916684B2 (ja) | 2007-05-16 |
KR19990076801A (ko) | 1999-10-15 |
JPH09180607A (ja) | 1997-07-11 |
US5990428A (en) | 1999-11-23 |
KR100313656B1 (ko) | 2002-01-30 |
DE19681706T1 (de) | 1998-11-26 |
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