US3811667A - Pneumatic holding device - Google Patents

Pneumatic holding device Download PDF

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Publication number
US3811667A
US3811667A US00289572A US28957272A US3811667A US 3811667 A US3811667 A US 3811667A US 00289572 A US00289572 A US 00289572A US 28957272 A US28957272 A US 28957272A US 3811667 A US3811667 A US 3811667A
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US
United States
Prior art keywords
cylinder
jaw
piston
pressure
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.)
Expired - Lifetime
Application number
US00289572A
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English (en)
Inventor
M Mayer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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
Priority claimed from DE19722229538 external-priority patent/DE2229538C3/de
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of US3811667A publication Critical patent/US3811667A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/204—Control means for piston speed or actuating force without external control, e.g. control valve inside the piston

Definitions

  • B25b l/l8,F01b 15/02 greater holding force is Provided with a Sensor P 58 Field of Search 91/206-209, adapted to bring about a Switch Over from Operation 9l/40l, 41 l A; 100/48, 49, 53, 269 R, 269 of the first cylinder to the second cylinder.
  • the sensor 2 9 23-27 3Q;425/151153, 154 pin is so loaded that it will only bring about the switching over when it strikes a.
  • the invention relates to a pneumatic holding device for clamping workpieces with two holding cylinders having different diameters, of which the first, with the smaller diameter, brings about a preliminary movement with a small thrust or force while the second, the main cylinder with a larger diameter, provides the holding force at the end of the preliminary movement.
  • an abutment sensor which opens a valve in order to place the main cylinder under pressure.
  • this valve is provided between the first cylinder and the main holding cylinder.
  • the abutment sensor can be constructed as a pin which is guided in a hole in the jaw of the holding cylinder so that the valve can only be actuated when the sensor pin comes to engage a hard obstacle such as wood or metal.
  • the valve which switches over from the cylinder with a low thrust to the full holding force can, however, not be operated by a soft obstacle such as a hand.
  • the invention thus ensures with certainty that the presence of the finger or hand cannot lead to the application of the dangerously high holding or clamping force which could lead to injury by crushing. Since all parts, which are necessary for the function of the cylinder, are arranged in the cylinder itself, the latter can be connected directly with a compressed airline just as is the case with any conventional holding or clamping cylinder.
  • the thrust or pressing force supplied by the first preliminary advancing cylinder is so small that the piston there is a large space left between the workpiece and the jaw or platen. This typeof operation in accordance with the invention ensures that there is no danger whatsoever for the operator.
  • the pneumatic holding device cannot only be used for holding workpieces but also for other purposes, for example for frame presses and similar holding devices in the case of which there also was a danger of injury.
  • FIGURE of the drawing shows a side view of a pneumatic holding or clamping device in accordance with the invention.
  • the holding or clamping device comprises a front housing part 10, which serves for fixing the position of the whole holding device on a holding rod 12.
  • This front housingpart comprises a double-walled cylinder with an outer wall 14 and an inner wall 16.
  • the wall 16 forms the first or preliminary advancing cylinder and simultaneously the piston rod of the main holding piston 18 carried by it.
  • This main holding piston 18 slides in the main holding cylinder20, which is mounted in the front housing part 10.
  • the main holding cylinder 20 is provided with a cylinder end closure 22, which is connected in a fixed manner with the plunger piston 24 of the first preliminary advancing cylinder l4, 16.
  • the main holding piston 18 is acted upon by a return spring 26 on the front housing part 10.
  • the front cylinder end closure of the preliminary advancing cylinder is formed by a valve body 28, which has a central opening, which guides a valve plunger 30 with a sealing plate 32.
  • the valve plunger 30 is provided with axial ducts 34, which are connected via radial holes 36 of the valve body 28 with the annular duct 38 between the two cylinders 14 and 16.
  • This annular duct 38 is connected via holes 40 with the pressure chamber 42'of the main pressure or holding cylinder.
  • This space 42 is connected via a check valve 44 and an adjustable choke 46 with the external air.
  • a jaw or platen 48 On the front part of the valve body 28 there is a jaw or platen 48 which is mounted in a pivoting or swinging manner. In a hole 50 in this jaw 48 there lies a sensor pin 52, which with a sliding piston or plunger 54 slides in an inner hole of the valve body.
  • the sensor pin 52 is biased in an outward direction by a helical compression spring 56.
  • the valve 30, 32 is biased or urged onto its seat by means of a helical compression spring 58.
  • the pressure medium is supplied to the preliminary advancing cylinder via an axial hole in the plunger piston 24.
  • pressure is built up in the cylinder space 62 so as to advance the cylinder 14, 16 and the holding piston 18.
  • the check valve 44 and the metering valve 46 are provided. With the metering valve 46 the amount of air supplied can be regulated and in this manner the advancing speed of the piston 18 can be adjusted at will. Owing to the pressure built up the sealing plate 32 of the valve plunger 30 is pressed correspondingly firmly against its seat.
  • the sealing plate 32 will be raised and the pressure can now pass through the holes 36 of the valve body and the annular duct 38 and the hole 40 towards the pressure space 42 of the main holding cylinder.
  • the main holding piston 18 exerts its full holding or clamping force. If the air supply is turned off and the device is vented, the spring 26 presses the piston back again. Venting occurs in this case in the opposite direction and the valve plunger 30, which can easily be displaced, is raised by the returning air.
  • the valve placed between the preliminary advancing cylinder and the main cylinder operates as follows.
  • an advancing force of 20.35 kg is produced. If one allows for a reduction of about 4 kg in the advancing force owing to the frictional resistance of the piston 18 and owing to the counter-pressure of the spring 26, there will in fact be an advancing force of approximately 16 kg.
  • the sealing plate 32 of the valve plunger 30 has a diameter of mm and is thus forced with a force of 8 kg per square centimeter against its valve seat. Therefore, a counterpressure of 14.24 kg is necessary in order to raise the valve plate.
  • the sensor pin at the jaw has a diameter of 8 mm so that a comparatively hard article of wood, metal or the like is necessary in order to raise the valve plunger 30.
  • the pressing force distributes itself, as supposed above, on the jaw, which has a diameter of at least 50 mm.
  • the pressing force is 16 kg. There is thus no possibility of such a strong counter-pressure being produced at the end of the sliding piston 54 that the valve plunger 30 is raised.
  • the two-part valve insert 30 and 54 is necessary because for a secure closure of the valve and also for venting of the valve plunger 30 great freedom of movement is necessary.
  • a pneumatic holding device for workpieces comprising:
  • a first cylinder of a first cross-section a fluid inlet to said first cylinder, through which said first cylinder is pressurized;
  • a second cylinder of a second cross-section larger than said first cross-section a first piston movable through said second cylinder; a pressure space behind said first piston in said second cylinder for being pressurized to move said first piston; a pressure jaw connected with said first piston and movable thereby, and having an operative surface to apply pressure;
  • valve for selectively opening and closing said conduit; said valve including an abutment sensor communicating with said jaw operative surface such that pressure applied to that surface is applied to said abutment sensor; said abutment sensor being shiftable and being connected with said valve such that shifting of said abutment sensor upon application of sufficient pressure to said jaw to shift said abutment sensor opens said valve and opens said conduit.
  • said abutment sensor comprises a slidable pin projecting beyond said jaw operative surface and slidable back through said jaw upon application of pressure thereto; said pin being shaped to engage and open said valve when pressure is applied thereto.
  • valve includes a sealing plate in said first cylinder that is positioned to be subject to the pressure in said first cylinder and that is movable by the pressure in said first cylinder to a position which closes said conduit and that is of a size to close said conduit.
  • valve housing for containing said valve; said plunger passing through a first opening in said valve housing; said sealing plate being of a size sufficient to seal said first opening as said sealing plate is pressed by pressure in said first cylinder against said valve housing, whereby said first opening is part of said conduit.
  • said low pressure piston comprises a piston rod to which said jaw is connected and on which said jaw is supported; said piston rod is hollow and within that hollow defines said first cylinder; said first and second cylinders are coaxial;
  • said first piston surrounds and is coaxial with said piston rod and said piston rod guides movement of said first piston.
  • conduit further comprises an annular chamber surrounding said piston rod, and a radial connection through said valve housing between said annular chamber and said first opening.
  • valve plunger has a rest position at which said sealing plate is against said valve housing; said slidable pin having a rest position projecting above said jaw; in their respective rest positions, said slidable pin and said plunger being gap spaced, and said slidable pin being so placed and shaped that when it is depressed toward said jaw, it contacts and then moves said plunger, thereby moving said sealing plate off said valve housing and opening said conduit.
  • valve housing carries the jaw in a rocking manner and the sensor pin extends through a hole in said jaw.
  • said low pressure piston comprises a piston rod to which said jaw is connected and on which said jaw is supported.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Jigs For Machine Tools (AREA)
  • Actuator (AREA)
  • Manipulator (AREA)
  • Tension Adjustment In Filamentary Materials (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
US00289572A 1972-06-16 1972-09-15 Pneumatic holding device Expired - Lifetime US3811667A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19722229538 DE2229538C3 (de) 1972-06-16 Pneumatische Einspannvorrichtung für Werkstücke

Publications (1)

Publication Number Publication Date
US3811667A true US3811667A (en) 1974-05-21

Family

ID=5847991

Family Applications (1)

Application Number Title Priority Date Filing Date
US00289572A Expired - Lifetime US3811667A (en) 1972-06-16 1972-09-15 Pneumatic holding device

Country Status (12)

Country Link
US (1) US3811667A (enrdf_load_stackoverflow)
JP (1) JPS5417467B2 (enrdf_load_stackoverflow)
BE (1) BE800979A (enrdf_load_stackoverflow)
CH (1) CH577877A5 (enrdf_load_stackoverflow)
DK (1) DK144597C (enrdf_load_stackoverflow)
ES (1) ES415985A1 (enrdf_load_stackoverflow)
FR (1) FR2189654B1 (enrdf_load_stackoverflow)
GB (1) GB1390576A (enrdf_load_stackoverflow)
IT (1) IT989098B (enrdf_load_stackoverflow)
NL (1) NL7308455A (enrdf_load_stackoverflow)
NO (1) NO136957C (enrdf_load_stackoverflow)
SE (1) SE404317B (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4280610A (en) * 1979-08-27 1981-07-28 Rockwell International Corporation Adjustable squeeze point safety device
US20130248746A1 (en) * 2012-03-22 2013-09-26 Xerex Ab Object-sensing valve for a vacuum gripper
CN104647245A (zh) * 2015-02-05 2015-05-27 山东孙杨机械设备有限公司 多工位保压装置

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55114505A (en) * 1979-02-28 1980-09-03 Matsushita Electric Works Ltd Preparation of dressing plywood
JPS57156963A (en) * 1981-03-23 1982-09-28 Nippon Seimitsu Kogyo Kk Kick-out mechanism for trailing edge of copied paper in copier
JPS57156964A (en) * 1981-03-23 1982-09-28 Nippon Seimitsu Kogyo Kk Kick-out mechanism for trailing edge of copied paper in copier
JPS5892505A (ja) * 1981-11-30 1983-06-01 笹野木材工業株式会社 合板の製造方法およびその製造装置
CN117245122B (zh) * 2023-11-20 2024-01-19 成都天科航空制造股份有限公司 一种用于航空销轴上钻止动销孔的钻孔工装及钻孔方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1932556A (en) * 1929-09-28 1933-10-31 Turner Tanning Machinery Co Press
US2693752A (en) * 1952-03-26 1954-11-09 Wilson & Co Inc Repeat action press
US2805447A (en) * 1953-11-05 1957-09-10 Voges Fred William Safety circuit for molding machine

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4711271U (enrdf_load_stackoverflow) * 1971-03-06 1972-10-11
JPS4722315U (enrdf_load_stackoverflow) * 1971-04-05 1972-11-13

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1932556A (en) * 1929-09-28 1933-10-31 Turner Tanning Machinery Co Press
US2693752A (en) * 1952-03-26 1954-11-09 Wilson & Co Inc Repeat action press
US2805447A (en) * 1953-11-05 1957-09-10 Voges Fred William Safety circuit for molding machine

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4280610A (en) * 1979-08-27 1981-07-28 Rockwell International Corporation Adjustable squeeze point safety device
US20130248746A1 (en) * 2012-03-22 2013-09-26 Xerex Ab Object-sensing valve for a vacuum gripper
US9114535B2 (en) * 2012-03-22 2015-08-25 Xerex Ab Object-sensing valve for a vacuum gripper
CN104647245A (zh) * 2015-02-05 2015-05-27 山东孙杨机械设备有限公司 多工位保压装置
CN104647245B (zh) * 2015-02-05 2016-08-17 山东孙杨机械设备有限公司 多工位保压装置

Also Published As

Publication number Publication date
IT989098B (it) 1975-05-20
JPS4935967A (enrdf_load_stackoverflow) 1974-04-03
NL7308455A (enrdf_load_stackoverflow) 1973-12-18
FR2189654A1 (enrdf_load_stackoverflow) 1974-01-25
ES415985A1 (es) 1976-02-16
NO136957C (no) 1977-12-07
JPS5417467B2 (enrdf_load_stackoverflow) 1979-06-29
SE404317B (sv) 1978-10-02
CH577877A5 (enrdf_load_stackoverflow) 1976-07-30
GB1390576A (en) 1975-04-16
DK144597C (da) 1982-09-27
FR2189654B1 (enrdf_load_stackoverflow) 1977-02-11
BE800979A (fr) 1973-10-01
NO136957B (no) 1977-08-29
DK144597B (da) 1982-04-13

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