GB2211280A - Joystick - Google Patents

Joystick Download PDF

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Publication number
GB2211280A
GB2211280A GB8724294A GB8724294A GB2211280A GB 2211280 A GB2211280 A GB 2211280A GB 8724294 A GB8724294 A GB 8724294A GB 8724294 A GB8724294 A GB 8724294A GB 2211280 A GB2211280 A GB 2211280A
Authority
GB
United Kingdom
Prior art keywords
joystick
rod
base plate
housing
seal
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.)
Granted
Application number
GB8724294A
Other versions
GB2211280B (en
GB8724294D0 (en
Inventor
Peter Malcom Kerrison
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.)
DACO SCIENT Ltd
Original Assignee
DACO SCIENT Ltd
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
Application filed by DACO SCIENT Ltd filed Critical DACO SCIENT Ltd
Priority to GB8724294A priority Critical patent/GB2211280B/en
Publication of GB8724294D0 publication Critical patent/GB8724294D0/en
Publication of GB2211280A publication Critical patent/GB2211280A/en
Application granted granted Critical
Publication of GB2211280B publication Critical patent/GB2211280B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05G—CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY
    • G05G9/00—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously
    • G05G9/02—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously the controlling member being movable in different independent ways, movement in each individual way actuating one controlled member only
    • G05G9/04—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously the controlling member being movable in different independent ways, movement in each individual way actuating one controlled member only in which movement in two or more ways can occur simultaneously
    • G05G9/047—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously the controlling member being movable in different independent ways, movement in each individual way actuating one controlled member only in which movement in two or more ways can occur simultaneously the controlling member being movable by hand about orthogonal axes, e.g. joysticks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H25/00—Switches with compound movement of handle or other operating part
    • H01H25/04—Operating part movable angularly in more than one plane, e.g. joystick
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05G—CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY
    • G05G9/00—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously
    • G05G9/02—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously the controlling member being movable in different independent ways, movement in each individual way actuating one controlled member only
    • G05G9/04—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously the controlling member being movable in different independent ways, movement in each individual way actuating one controlled member only in which movement in two or more ways can occur simultaneously
    • G05G9/047—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously the controlling member being movable in different independent ways, movement in each individual way actuating one controlled member only in which movement in two or more ways can occur simultaneously the controlling member being movable by hand about orthogonal axes, e.g. joysticks
    • G05G2009/04703—Mounting of controlling member
    • G05G2009/04722—Mounting of controlling member elastic, e.g. flexible shaft
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05G—CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY
    • G05G9/00—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously
    • G05G9/02—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously the controlling member being movable in different independent ways, movement in each individual way actuating one controlled member only
    • G05G9/04—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously the controlling member being movable in different independent ways, movement in each individual way actuating one controlled member only in which movement in two or more ways can occur simultaneously
    • G05G9/047—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously the controlling member being movable in different independent ways, movement in each individual way actuating one controlled member only in which movement in two or more ways can occur simultaneously the controlling member being movable by hand about orthogonal axes, e.g. joysticks
    • G05G2009/0474—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously the controlling member being movable in different independent ways, movement in each individual way actuating one controlled member only in which movement in two or more ways can occur simultaneously the controlling member being movable by hand about orthogonal axes, e.g. joysticks characterised by means converting mechanical movement into electric signals
    • G05G2009/04762—Force transducer, e.g. strain gauge
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2239/00—Miscellaneous
    • H01H2239/052—Strain gauge

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Mechanical Control Devices (AREA)
  • Position Input By Displaying (AREA)

Abstract

A joystick (10) has a base plate (12) which is adapted to be secured to a panel (13). A housing (16) is formed on the base plate. A tensile rod (14) is secured at one end to the base plate and the other end extends through an aperture (20) in the housing and carries a manipulative knob (22). Strain gauges (26, 27) are attached to a square section of the rod inside the housing, whereby deflection of the rod in any direction perpendicular to the rod may be measured. The joystick may be mounted on the panel (13) without intrusion into the space below. <IMAGE>

Description

JOYSTICK This invention relates to joysticks1 particularly to joysticks employed in electronic situations where it is desired to move a cursor on a screen in any two dimensional direction.
Joysticks are conventionally used to measure the two orthogonal components of direction in which the joystick is moved. In addition the joystick may also measure the extent of the movement in the two orthogonal directions.
A particular type of joystick allows no apparent movement of the stick itself when in operation, but simply measures the force applied to the joystick. The joystick in such situation may comprise a resilient rod which is deflected by applied force, and has two pairs of strain gauges applied to the faces of a squared section of the rod. Thus bending of the rod in any direction tends to compress one of the pair of strain gauges while tensioning the other. Unless the bending of the rod is in the piane passing through the two gauges of one pair, one of each of the pairs will be compressed to some extent, while the others are tensioned. See for example British Patent No 687823.
Such joysticks are frequently mounted in a panel on which other controls and/or displays are also mounted. As in most electronic fields, it is desired to reduce the size of components as much as possible to render them less obtrusive and easier to handle. This is particularly true of the space below the panel, because reduction of the size of this space is not limited by the necessity to provide adequate room for manipulation of controls, switches and joysticks etc. The reduction of this space is limited solely by the size of components mounted under the panel, and in many situations the most limiting component is the part of a joystick extending through the panel.
Hitherto, a joystick has comprised a steer plate in which the rod is mounted, a steel housing connected to the plate and through which the rod extends and which housing is mountable in a panel around a neck thereof.
It is an object of this invention therefore to provide a joystick which can be incorporated in a panel without intruding to a significant extent below the panel.
In accordance with the invention there is provided a joystick comprising a base plate adapted to be secured to a panel and having fixed therein a tensile rod whose other end extends through an aperture formed in a housing mounted on the base plate and which rod carries a manipulative knob, strain gauges being attached to the surfaces of a square section of the rod inside the housing and providing means to measure deflection of the rod in any direction perpendicular to the rod, the aperture in the housing providing a limiting stop against excessive deflection of the rod.
Electrical connections providing excitation voltage for the strain gauges and resultant measurements may be arranged to extend through an aperture formed in the base plate. Preferably the strain gauges are electrically connected to pads bonded to but insulated from the rod. A heat shrinkable insulating sleeve reinforces said electrical connections to said pads.
A resilient sleeve is preferably mounted on the housing and knob to seal the housing. Also a seal, preferably in the form of an O-ring, is provided on the base plate to seal it against the panel when secured thereto.
The joystick according to the invention therefore has no intrusion into the space below the panel1 other than the electrical connections which are not significant. A further advantage is provided in that the plate in which the rod is mounted is itself directly mounted on the panel thereby rendering the assembly much more rigid, or alternatively enabling the joystick to be constructed from a lighter material such as an appropriate aluminium alloy.
The invention is further described hereinafter, by way of example only, with reference to the accompanying drawing, in which: Fig 1 is a section through a joystick according to the invention; and, Fig 2 is a diagram of a circuit suitable for use with the joystick of Fig 1.
In the drawing, a joystick 10 comprises a base plate 12 of suitably rigid material such as aluminium alloy. The base plate 12 is securable to a panel 13 and has holes 15 formed around its circumference adapted to receive appropriate fastenings. The base plate 12 mounts a housing 16, preferably also of aluminium alloy, which is secured to the base plate by any convenient means such as by adhesion with an anaerobic adhesive. In a central bore through the base plate 12 there is also mounted a rod 14 of tensile material, again by adhesion or by a press fit if preferred.
The housing 16 has a neck 18 in the centre of which is an aperture 20 through which the rod 14 extends. On the end of the rod 14 there is provided a knob 22 for manipulation by the user of the joystick. It will be appreciated that this knob can be of any shape or size as preferred, although, if it is large, some modification to the geometry of the joystick may be required to avoid problems occurring if and when excessive force is applied to the knob by the user. Further explanation is provided below.
Near its base in the base plate the rod 14 has a square section 24 and on each face thereof is disposed a proprietary strain gauge 26 of the variable resistance type. Fine electrical leads connect the strain gauges 26 to pads 27 bonded to but insulated frpm the rod 14 at a position 28 where the cross sectional area of the rod is increased so as to reduce strain.
Flexible plastics insulated wires are connected to the pads 27. The connection of the wires 36 to the pads 27 is reinforced by a heat shrink sleeve 30.
The wires 36 to the pads 27 are sleeved together into a cable 38 which passes through an aperture 32 formed in the base plate 12 and thence through a hole 33 in the panel 13. The cable 38 is secured and sealed in the base plate 12 by heat shrink sleeves 40.
The strain gauges operate in known manner and are electrically connected as shown in Fig 2. A suitable excitation voltage is applied across connections A and B through each pair of strain gauges 26 a and b and 27 a and b, each pair being disposed on opposite faces of the square section 24 of the rod 14. When the rod 14 is deflected by applied force to the knob 22 in any direction perpendicular to rod 14, the electrical resistance of the strain gauges is affected so altering the voltage occurring between them. Thus connections C and D between each pair of strain gauges monitor the change of voltage and between them indicate the orthogonal components, x and y, of the force applied to the knob 22.
To complete the seal on the joystick 10, an elastomeric sleeve 40 is disposed about the neck 18 and knob 22 and an O-ring seal 42 is carried in a groove 44 in the base plate 12 to seal against the panel 13 when connected thereto.
The knob 22 can be of any shape as mentioned above but if it allows too large a force to be applied to the rod 14 by the user of the joystick there is a danger that, once the rod contacts the stop aperture 20 further deflection may cause the rod to adopt an S-shape when the deflection measured by the strain gauges might in fact be in the opposite sense to that actually applied. If such a large knob is required1 adaptation of the geometry of the joystick may be required to avoid risk of the aforementioned problem occurring.
While the invention has been described with reference to specific elements and combinations of elements1 it is envisaged that each element may be combined with any other or any combination of other elements. It is not intended to limit the invention to the particular combinations of elements suggested. Furthermore, the foregoing description is not intended to suggest that any element mentioned is indispensable to the invention, or that alternatives may not be employed. What is defined as the invention should not be construed as limiting the extent of the disclosure of this specification.

Claims (10)

1. A joystick comprising a base plate adapted to be secured to a panel, a housing formed on the base plate, a tensile rod secured at one end to the base plate and whose other end extends through an aperture formed in the housing and carries a manipulative knob, and strain gauges which are attached to the rod inside the housing so as to provide means whereby deflection of the rod in any direction perpendicular to the rod may be measured.
2. A joystick as claimed in claim 1 in which electrical connections providing excitation voltage for the strain gauges and resultant measurements are arranged to extend through an aperture formed in the base plate.
3. A joystick as claimed in claim 2 in which the strain gauges are electrically connected to pads bonded to the rod at a point axially spaced from the strain gauges1 said pads being electrically insulated from the rod.
4. A joystick as claimed in claim 3 in which a heat shrinkable insulating sleeve surrounding said pads reinforces said electrical connections to said pads.
5. A joystick as claimed in any preceding claim in which a resilient sleeve is mounted around the aperture in the housing and around the rod, or the knob connected thereto, to seal the housing.
6. A joystick as claimed in any preceding claim in which a seal is provided on the base plate to seal it against the panel when secured thereto.
7. A joystick as claimed in claim 6 in which said seal is in the form of an O-ring carried in an annular channel formed in the base plate.
8. A joystick as claimed in any preceding claim in which the aperture in the housing provides a limiting stop against excessive deflection of the rod.
9. A joystick as claimed in any preceding claim in which the rod, at least in the region where the strain guages are attached thereto1 is square in section.
10. A joystick substantially as hereinbefore described with reference to the accompanying drawings.
GB8724294A 1987-10-16 1987-10-16 Joystick Expired - Fee Related GB2211280B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8724294A GB2211280B (en) 1987-10-16 1987-10-16 Joystick

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8724294A GB2211280B (en) 1987-10-16 1987-10-16 Joystick

Publications (3)

Publication Number Publication Date
GB8724294D0 GB8724294D0 (en) 1987-11-18
GB2211280A true GB2211280A (en) 1989-06-28
GB2211280B GB2211280B (en) 1991-10-30

Family

ID=10625421

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8724294A Expired - Fee Related GB2211280B (en) 1987-10-16 1987-10-16 Joystick

Country Status (1)

Country Link
GB (1) GB2211280B (en)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0447334A1 (en) * 1990-03-15 1991-09-18 SEXTANT Avionique Manipulator with strain gauges
EP0540662A1 (en) * 1990-07-24 1993-05-12 Home Row Inc Keyswitch-integrated pointing assembly.
FR2684464A1 (en) * 1991-11-29 1993-06-04 Sextant Avionique HANDLING HANDLE.
WO1993020535A2 (en) * 1992-03-25 1993-10-14 Penny & Giles Blackwood Limited Joystick
EP0567698A1 (en) * 1992-04-29 1993-11-03 Kayaba Industry Co., Ltd. Input apparatus
EP0635858A1 (en) * 1993-07-23 1995-01-25 Sextant Avionique Joystick
WO1996038810A1 (en) * 1995-06-02 1996-12-05 Gerhard Wergen Analogue control element
DE19903830A1 (en) * 1999-02-01 2000-08-17 Asim Genc Data input and, control device for computer, with functionally two part sensor to detect even torsion force
US20090248042A1 (en) * 2008-03-27 2009-10-01 Kirschenman Mark B Model catheter input device
DE19827481B4 (en) * 1997-06-20 2010-09-09 Bosch Rexroth D.S.I. Manual remote control device, in particular fluid distributor
US9795447B2 (en) 2008-03-27 2017-10-24 St. Jude Medical, Atrial Fibrillation Division, Inc. Robotic catheter device cartridge
US9888973B2 (en) 2010-03-31 2018-02-13 St. Jude Medical, Atrial Fibrillation Division, Inc. Intuitive user interface control for remote catheter navigation and 3D mapping and visualization systems
US10231788B2 (en) 2008-03-27 2019-03-19 St. Jude Medical, Atrial Fibrillation Division, Inc. Robotic catheter system
US10357322B2 (en) 2009-07-22 2019-07-23 St. Jude Medical, Atrial Fibrillation Division, Inc. System and method for controlling a remote medical device guidance system in three-dimensions using gestures
US10426557B2 (en) 2008-03-27 2019-10-01 St. Jude Medical, Atrial Fibrillation Division, Inc. System and method of automatic detection of obstructions for a robotic catheter system

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8317744B2 (en) 2008-03-27 2012-11-27 St. Jude Medical, Atrial Fibrillation Division, Inc. Robotic catheter manipulator assembly
WO2009120992A2 (en) 2008-03-27 2009-10-01 St. Jude Medical, Arrial Fibrillation Division Inc. Robotic castheter system input device
US9241768B2 (en) 2008-03-27 2016-01-26 St. Jude Medical, Atrial Fibrillation Division, Inc. Intelligent input device controller for a robotic catheter system
US8641664B2 (en) 2008-03-27 2014-02-04 St. Jude Medical, Atrial Fibrillation Division, Inc. Robotic catheter system with dynamic response
US9330497B2 (en) 2011-08-12 2016-05-03 St. Jude Medical, Atrial Fibrillation Division, Inc. User interface devices for electrophysiology lab diagnostic and therapeutic equipment

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2895086A (en) * 1957-03-11 1959-07-14 Sperry Rand Corp Control stick transducer
GB1240866A (en) * 1968-08-22 1971-07-28 Amf Inc Control device
GB1427621A (en) * 1972-01-19 1976-03-10 Canon Kk Positioning device provided with a follow-up operating mechanism/
EP0151479A2 (en) * 1984-02-06 1985-08-14 Siemens Aktiengesellschaft Control assembly

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2895086A (en) * 1957-03-11 1959-07-14 Sperry Rand Corp Control stick transducer
GB1240866A (en) * 1968-08-22 1971-07-28 Amf Inc Control device
GB1427621A (en) * 1972-01-19 1976-03-10 Canon Kk Positioning device provided with a follow-up operating mechanism/
EP0151479A2 (en) * 1984-02-06 1985-08-14 Siemens Aktiengesellschaft Control assembly

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0447334A1 (en) * 1990-03-15 1991-09-18 SEXTANT Avionique Manipulator with strain gauges
FR2659789A1 (en) * 1990-03-15 1991-09-20 Sextant Avionique CONSTRAINED GAUGE MANIPULATOR.
US5228348A (en) * 1990-03-15 1993-07-20 Sextant Avionique Strain gauge joystick
EP0540662A1 (en) * 1990-07-24 1993-05-12 Home Row Inc Keyswitch-integrated pointing assembly.
EP0540662A4 (en) * 1990-07-24 1993-09-01 Home Row, Inc. Keyswitch-integrated pointing assembly
FR2684464A1 (en) * 1991-11-29 1993-06-04 Sextant Avionique HANDLING HANDLE.
EP0545832A1 (en) * 1991-11-29 1993-06-09 CROUZET Automatismes Joystick
WO1993020535A2 (en) * 1992-03-25 1993-10-14 Penny & Giles Blackwood Limited Joystick
WO1993020535A3 (en) * 1992-03-25 1993-11-25 Penny & Giles Blackwood Ltd Joystick
US5831596A (en) * 1992-03-25 1998-11-03 Penney & Giles Blackwood Limited Joystick controller using magnetic position sensors and a resilient control arm with sensor used to measure its flex
EP0567698A1 (en) * 1992-04-29 1993-11-03 Kayaba Industry Co., Ltd. Input apparatus
US5543592A (en) * 1993-07-23 1996-08-06 Sextant Avionique Multimode manipulator
EP0635858A1 (en) * 1993-07-23 1995-01-25 Sextant Avionique Joystick
FR2707911A1 (en) * 1993-07-23 1995-01-27 Sextant Avionique Manipulator with multimode actuation.
WO1996038810A1 (en) * 1995-06-02 1996-12-05 Gerhard Wergen Analogue control element
US6201196B1 (en) * 1995-06-02 2001-03-13 Gerhard Wergen Joystick assembly
DE19827481B4 (en) * 1997-06-20 2010-09-09 Bosch Rexroth D.S.I. Manual remote control device, in particular fluid distributor
DE19903830A1 (en) * 1999-02-01 2000-08-17 Asim Genc Data input and, control device for computer, with functionally two part sensor to detect even torsion force
US20090248042A1 (en) * 2008-03-27 2009-10-01 Kirschenman Mark B Model catheter input device
US9795447B2 (en) 2008-03-27 2017-10-24 St. Jude Medical, Atrial Fibrillation Division, Inc. Robotic catheter device cartridge
US10231788B2 (en) 2008-03-27 2019-03-19 St. Jude Medical, Atrial Fibrillation Division, Inc. Robotic catheter system
US10426557B2 (en) 2008-03-27 2019-10-01 St. Jude Medical, Atrial Fibrillation Division, Inc. System and method of automatic detection of obstructions for a robotic catheter system
US11717356B2 (en) 2008-03-27 2023-08-08 St. Jude Medical, Atrial Fibrillation Division, Inc. System and method of automatic detection of obstructions for a robotic catheter system
US10357322B2 (en) 2009-07-22 2019-07-23 St. Jude Medical, Atrial Fibrillation Division, Inc. System and method for controlling a remote medical device guidance system in three-dimensions using gestures
US9888973B2 (en) 2010-03-31 2018-02-13 St. Jude Medical, Atrial Fibrillation Division, Inc. Intuitive user interface control for remote catheter navigation and 3D mapping and visualization systems

Also Published As

Publication number Publication date
GB2211280B (en) 1991-10-30
GB8724294D0 (en) 1987-11-18

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PCNP Patent ceased through non-payment of renewal fee