EP0231317A1 - Apparatus for engraving upstanding surfaces - Google Patents

Apparatus for engraving upstanding surfaces

Info

Publication number
EP0231317A1
EP0231317A1 EP19860904861 EP86904861A EP0231317A1 EP 0231317 A1 EP0231317 A1 EP 0231317A1 EP 19860904861 EP19860904861 EP 19860904861 EP 86904861 A EP86904861 A EP 86904861A EP 0231317 A1 EP0231317 A1 EP 0231317A1
Authority
EP
European Patent Office
Prior art keywords
carriage
frame
guides
engraved
engraving
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
EP19860904861
Other languages
German (de)
French (fr)
Inventor
David Charles Gordon
Trevor John Kendall
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.)
PERMANENT SIGN Co Ltd
Original Assignee
PERMANENT SIGN Co 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
Priority claimed from GB858519534A external-priority patent/GB8519534D0/en
Priority claimed from GB858521027A external-priority patent/GB8521027D0/en
Application filed by PERMANENT SIGN Co Ltd filed Critical PERMANENT SIGN Co Ltd
Publication of EP0231317A1 publication Critical patent/EP0231317A1/en
Pending legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B28WORKING CEMENT, CLAY, OR STONE
    • B28DWORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B44DECORATIVE ARTS
    • B44BMACHINES, APPARATUS OR TOOLS FOR ARTISTIC WORK, e.g. FOR SCULPTURING, GUILLOCHING, CARVING, BRANDING, INLAYING
    • B44B3/00Artist's machines or apparatus equipped with tools or work holders moving or able to be controlled substantially two- dimensionally for carving, engraving, or guilloching shallow ornamenting or markings
    • B44B3/001Artist's machines or apparatus equipped with tools or work holders moving or able to be controlled substantially two- dimensionally for carving, engraving, or guilloching shallow ornamenting or markings by copying
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B44DECORATIVE ARTS
    • B44BMACHINES, APPARATUS OR TOOLS FOR ARTISTIC WORK, e.g. FOR SCULPTURING, GUILLOCHING, CARVING, BRANDING, INLAYING
    • B44B3/00Artist's machines or apparatus equipped with tools or work holders moving or able to be controlled substantially two- dimensionally for carving, engraving, or guilloching shallow ornamenting or markings
    • B44B3/06Accessories, e.g. tool or work holders
    • B44B3/061Tool heads

Definitions

  • the present invention relates to engraving apparatus for engraving concrete wall surfaces or the like in an 5 elevation position in situ.
  • the present invention provides apparatus for use in engraving an upstanding concretious surface in an elevated position in situ; said apparatus comprising a frame, means on the frame for receiving one or more stencils, a
  • carriage means supporting the carriage for movement relative to the frame within a plane parallel ( to the surface to be engraved, an engraving tool or tool holder supported by the carriage for permitting the tool to engage the surface to be engraved, a stencil guide which
  • 20 can be made to follow a pattern defined by a stencil by movement of the carriage in said plane, and means for supporting the frame in said elevated position alongside the surface to be engraved or for raising and lowering the frame to and from such a position.
  • tubular guides or the like can define the directions of movement of the carriage.
  • the support means for the frame can take the form of a multi-sectional base frame which is adjustable, at least partly, to vary the height of the frame.
  • the frame can be conveniently mounted to a raisable jib or arm of a vehicle which enables the frame to be raised and lowered to and from the elevated position.
  • Thrust means can be provided to urge the frame towards the surface to be engraved although where the frame is carried by the arm of a vehicle the vehicle or arm can serve to provide thrust force.
  • means is provided to compensate for the effects of gravity otherwise tending to move the carriage downwardly in its plane of movement.
  • Figure 1 is a perspective view of part of an engraving apparatus in accordance with the invention.
  • Figure 2 is an end elevation of the apparatus constructed in accordance with the invention
  • Figure 3 is a front elevation of a unit of a base frame of a further form of apparatus
  • Figure 4 is a side elevation of the unit shown in Figure 3;
  • Figure 5 depicts a mobile vehicle adapted as the engraving apparatus in accordance with the invention;
  • Figure 6 is a schematic part-sectional view of part of the apparatus showing a modification
  • Figure 7 is a schematic part-sectional view of part of the apparatus showing a further modification. MODE(S) FOR CARRYING OUT THE INVENTION
  • the reference numeral 10 denotes a unit composed of various parts of the engraving apparatus used with other equipment described hereinafter.
  • the unit 10 is held in an elevated position or is moved to and from such a position, by associated means designated 90 in Figure 1.
  • the unit 10 as depicted in Figure 1 is composed of a frame 11 with side members 28 and a channel-like transverse structure 27 which receives cut-out stencils 18.
  • Bearing blocks or collars 20 are mounted for sliding along a pair of tubular guides 19 disposed between the side members 20.
  • a pair of tubular guides 21 interconnect the blocks 20 and a carriage 12 in turn slidably mounted on the tubular guides 21 with the aid of bearing blocks or collars 22.
  • the guides 21 extend perpendicular to the guides 19.
  • the carriage 12 has a handle 24 for displacing the carriage 12 along the guides 21 in the direction of arrows C-D.
  • the guides 21 are additionally connected at their ends with a cross-piece serving as a handle 25 for displacing the carriage 12 along the guides 19 in the direction of arrows A-B.
  • the carriage 12 supports a stencil-engaging guide 15 which an operator can displace by moving the carriage 12 as appropriate to follow the shape of the stencils 18.
  • a rotary engraving tool 29 with a replaceable hardened bit is likewise supported by a holder on the carriage 12 and follows the path described by the guide 15 to permanently mark an upstanding surface 30, usually a wall of a building, in situ and in an elevated position.
  • a base frame 50 a justable with screw devices 51 or the like can be used as shown in Figure 2 to bring the machine into a desired height position.
  • the main frame 11 is supported on the base frame 50 with the aid of straps 54 and adjustment of the frame 50 can raise and lower the main frame 11.
  • the base frame 50 can be made up from easily-assembled units permitting the frame 50 to be built up to any desired height.
  • Figures 3 and 4 depict one of a pair of units 40 which combine to form another base frame 50 for holding the machine 10 in an elevated disposition. As shown each unit has major and minor upstanding support legs 41,42 interconnected with bracing straps 43,44.
  • the side members 28 of the machine frame 11 are detachably fixed to mounting blocks 81 on the major legs 41 of the units 40.
  • the legs 41,42 are provided with adjustable feet 45 which can be swivelled and raised and lowered with the aid of adjusting rings 46.
  • the major leg 41 is additionally provided at its upper end with a bracket 47 pivotably joined to an inclined support arm 48.
  • the lower end of the arm 48 is provided with a strap 49 which receives another adjustable foot 45.
  • additional thrust producing means such as piston and cylinder units or rams pneumatic or hydraulic can be interposed between the base frame 50 and the elevated frame 11.
  • the machine 10 may be carried by a mobile vehicle capable of holding the frame 11 in an elevated position against the surface 30.
  • Figure 5 depicts a vehicle 59 which has a raisable and lowerable jib or arm 60 supporting the frame 11 in a detachable manner.
  • a linkage 61 can be interposed between the frame 11 and the arm 60.
  • the vehicle 59 or the arm 60 can also serve to thrust the frame 11 against the surface to be engraved during use but additional thrust producing means such as hydraulic or pneumatic rams can also be interposed between the arm 60 and the frame 11 if desired.
  • the carriage 12 tends to move downwardly on the guides 21 due to gravity and an operator needs to overcome this bias when raising the carriage 12 to follow the stencils 18.
  • means is provided to compensate for this.
  • a counterweight W is linked via a cable 46 engaged on a rotatably pulley 45 to the carriage 12.
  • compression springs 42 can be mounted on the guides 21 between the blocks 22, 20 as shown in Figure 7, to compensate for the effects of gravity on the carriage 12.
  • the above description essentially relates to a product of manufacture which is moreover industrially usable in a useful manner to engrave or mark an existing concrete surface in its external environment in situ.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Straightening Metal Sheet-Like Bodies (AREA)
  • Vehicle Cleaning, Maintenance, Repair, Refitting, And Outriggers (AREA)

Abstract

L'appareil de gravure adapté pour graver une surface droite d'un mur dans une position d'élévation in situ possède un châssis principal (11) avec une section en canal (27) qui reçoit des pochoirs (18) présentant des symboles à reproduire à l'aide d'un outil de gravure (29). L'outil (29) et un guide complémentaire (15) d'engagement du pochoir sont montés sur un chariot (12). Le chariot (12) peut se déplacer le long de groupes de guides tubulaires (21, 29) pour permettre à un opérateur de suivre les symboles définis par les pochoirs (18). Le châssis principal (11) est supporté par un cadre de base réglable (50, 40) qui maintient le châssis principal dans une position élevée ou par une flèche (60) d'un véhicule mobile qui peut monter ou descendre le châssis (11) par rapport à la position d'élévation.The engraving apparatus adapted to engrave a straight surface of a wall in an elevated position in situ has a main frame (11) with a channel section (27) which receives stencils (18) having symbols to be reproduced using an engraving tool (29). The tool (29) and a complementary guide (15) for engaging the stencil are mounted on a carriage (12). The carriage (12) can move along groups of tubular guides (21, 29) to allow an operator to follow the symbols defined by the stencils (18). The main frame (11) is supported by an adjustable base frame (50, 40) which holds the main frame in an elevated position or by an arrow (60) of a mobile vehicle which can raise or lower the frame (11) from the elevation position.

Description

^Apparatus for engraving upstanding surfaces. TECHNICAL FIELD
The present invention relates to engraving apparatus for engraving concrete wall surfaces or the like in an 5 elevation position in situ. BACKGROUND ART
A known engraving machine of the type with which the present invention is concerned is described in GB Patent Publication No 2138748.
- Q DISCLOSURE OF INVENTION
The present invention provides apparatus for use in engraving an upstanding concretious surface in an elevated position in situ; said apparatus comprising a frame, means on the frame for receiving one or more stencils, a
15 carriage, means supporting the carriage for movement relative to the frame within a plane parallel (to the surface to be engraved, an engraving tool or tool holder supported by the carriage for permitting the tool to engage the surface to be engraved, a stencil guide which
20 can be made to follow a pattern defined by a stencil by movement of the carriage in said plane, and means for supporting the frame in said elevated position alongside the surface to be engraved or for raising and lowering the frame to and from such a position.
25 As is known from GB 2138748 tubular guides or the like can define the directions of movement of the carriage.
Conveniently, the support means for the frame can take the form of a multi-sectional base frame which is adjustable, at least partly, to vary the height of the frame.
Alternatively, the frame can be conveniently mounted to a raisable jib or arm of a vehicle which enables the frame to be raised and lowered to and from the elevated position.
Thrust means can be provided to urge the frame towards the surface to be engraved although where the frame is carried by the arm of a vehicle the vehicle or arm can serve to provide thrust force.
In accordance with a further aspect of the invention means is provided to compensate for the effects of gravity otherwise tending to move the carriage downwardly in its plane of movement.
The invention may be understood more,readily and various other aspects and features of the invention may become more apparent from consideration of the following description. BRIEF DESCRIPTION OF THE DRAWINGS
Embodiments of the invention will now be described, by way of example only, with reference to the accompanying drawings, wherein:-
Figure 1 is a perspective view of part of an engraving apparatus in accordance with the invention;
Figure 2 is an end elevation of the apparatus constructed in accordance with the invention; Figure 3 is a front elevation of a unit of a base frame of a further form of apparatus;
Figure 4 is a side elevation of the unit shown in Figure 3; Figure 5 depicts a mobile vehicle adapted as the engraving apparatus in accordance with the invention;
Figure 6 is a schematic part-sectional view of part of the apparatus showing a modification; and
Figure 7 is a schematic part-sectional view of part of the apparatus showing a further modification. MODE(S) FOR CARRYING OUT THE INVENTION
In the accompanying drawings, the reference numeral 10 denotes a unit composed of various parts of the engraving apparatus used with other equipment described hereinafter. The unit 10 is held in an elevated position or is moved to and from such a position, by associated means designated 90 in Figure 1. The unit 10 as depicted in Figure 1 is composed of a frame 11 with side members 28 and a channel-like transverse structure 27 which receives cut-out stencils 18. Bearing blocks or collars 20 are mounted for sliding along a pair of tubular guides 19 disposed between the side members 20. A pair of tubular guides 21 interconnect the blocks 20 and a carriage 12 in turn slidably mounted on the tubular guides 21 with the aid of bearing blocks or collars 22. The guides 21 extend perpendicular to the guides 19. The carriage 12 has a handle 24 for displacing the carriage 12 along the guides 21 in the direction of arrows C-D. The guides 21 are additionally connected at their ends with a cross-piece serving as a handle 25 for displacing the carriage 12 along the guides 19 in the direction of arrows A-B. The carriage 12 supports a stencil-engaging guide 15 which an operator can displace by moving the carriage 12 as appropriate to follow the shape of the stencils 18. A rotary engraving tool 29 with a replaceable hardened bit is likewise supported by a holder on the carriage 12 and follows the path described by the guide 15 to permanently mark an upstanding surface 30, usually a wall of a building, in situ and in an elevated position.
A base frame 50 a justable with screw devices 51 or the like can be used as shown in Figure 2 to bring the machine into a desired height position. The main frame 11 is supported on the base frame 50 with the aid of straps 54 and adjustment of the frame 50 can raise and lower the main frame 11. The base frame 50 can be made up from easily-assembled units permitting the frame 50 to be built up to any desired height. Figures 3 and 4 depict one of a pair of units 40 which combine to form another base frame 50 for holding the machine 10 in an elevated disposition. As shown each unit has major and minor upstanding support legs 41,42 interconnected with bracing straps 43,44. The side members 28 of the machine frame 11 are detachably fixed to mounting blocks 81 on the major legs 41 of the units 40. The legs 41,42 are provided with adjustable feet 45 which can be swivelled and raised and lowered with the aid of adjusting rings 46. The major leg 41 is additionally provided at its upper end with a bracket 47 pivotably joined to an inclined support arm 48. The lower end of the arm 48 is provided with a strap 49 which receives another adjustable foot 45. To hold the frame 11 reliably in place during engraving additional thrust producing means such as piston and cylinder units or rams pneumatic or hydraulic can be interposed between the base frame 50 and the elevated frame 11.
As a general alternative to the base frames 50, the machine 10 may be carried by a mobile vehicle capable of holding the frame 11 in an elevated position against the surface 30. Figure 5 depicts a vehicle 59 which has a raisable and lowerable jib or arm 60 supporting the frame 11 in a detachable manner. A linkage 61 can be interposed between the frame 11 and the arm 60. The vehicle 59 or the arm 60 can also serve to thrust the frame 11 against the surface to be engraved during use but additional thrust producing means such as hydraulic or pneumatic rams can also be interposed between the arm 60 and the frame 11 if desired.
The carriage 12 tends to move downwardly on the guides 21 due to gravity and an operator needs to overcome this bias when raising the carriage 12 to follow the stencils 18. In accordance with a further feature of the invention means is provided to compensate for this. Thus, as shown in Figure 6, to assist in controlling the displacement of the carriage 12 a counterweight W is linked via a cable 46 engaged on a rotatably pulley 45 to the carriage 12. Alternatively compression springs 42 can be mounted on the guides 21 between the blocks 22, 20 as shown in Figure 7, to compensate for the effects of gravity on the carriage 12. INDUSTRIAL APPLICABILITY
The above description essentially relates to a product of manufacture which is moreover industrially usable in a useful manner to engrave or mark an existing concrete surface in its external environment in situ.

Claims

WE CLAIM
1. Apparatus for use in engraving an upstanding concretious surface in an elevated position in situ; said apparatus comprising a frame (11), means (27) on the frame for receiving one or more stencils (18), a carriage (12), means (20, 21, 22) supporting the carriage (12) for movement relative to the frame within a plane parallel to the surface to be engraved, an engraving tool or tool holder (29) supported by the carriage (12) for permitting the tool to engage the surface to be engraved, a stencil guide (15) which can be made to follow a pattern defined by a stencil by movement of the carriage in said plane, and support means (50, 59, 60) for supporting the frame in said elevated position alongside the surface to be engraved or for raising and lowering the frame to and from such a position.
2. Apparatus according to claim 1, wherein the frame (11) is composed of side members (28) with a channel-like transverse structure (27) therebetween, said structure constituting at least in part the stencil reception means.
3. Apparatus according to claim 1, wherein the carriage support means supports the carriage for movement in orthogonal directions.
4. Apparatus according to claim 2, wherein a first set of elongate guides (19) extend between the side members
(28), and the carriage support means takes the form of bearing collars (20) mounted for sliding on said first set of guides, a further set of elongate guides (21) extending perpendicularly to the first set of guides and interconnecting said collars (20) and further bearing collars (23) mounted to the carriage (12) for sliding on said further set of guides.
5. Apparatus according to claim 4, wherein the further set of guides are interconnected by a cross-piece (25) serving as a handle for displacing the carriage (12) along the first set of guides and the carriage has a further handle (24) for displacing the carriage along the further set of guides (21).
6. Apparatus according to any one of claims 1 to 5, wherein the support means for the frame comprises a further adjustable base frame (50).
7. Apparatus according to any one of claims 1 to 5, wherein the support means for the frame comprises a raisable and lowerable jib (60) of a mobile vehicle (59).
8. Apparatus according to any one of the preceding claims and further comprising thrust means for urging the frame towards the surface to be engraved during use.
9. Apparatus according to claim 7, wherein the jib (60) or vehicle (59) is used to thrust the frame towards the surface to be engraved during use.
10. Apparatus according to any one of the preceding claims and further comprising means for compensating for the effects of gravity otherwise tending to move the carriage downwardly in said plane.
11. Apparatus according to claim 10, wherein the compensation means takes the form of a counter-weight (W) linked to the carriage (12) with a cable (46).
12. Apparatus according to claim 10, wherein the compensation means takes the form of compression springs (47) biasing the carriage (12) in an upward direction.
EP19860904861 1985-08-02 1986-07-31 Apparatus for engraving upstanding surfaces Pending EP0231317A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB8519534 1985-08-02
GB858519534A GB8519534D0 (en) 1985-08-02 1985-08-02 Engraving machines
GB8521027 1985-08-22
GB858521027A GB8521027D0 (en) 1985-08-22 1985-08-22 Engraving machines

Publications (1)

Publication Number Publication Date
EP0231317A1 true EP0231317A1 (en) 1987-08-12

Family

ID=26289600

Family Applications (2)

Application Number Title Priority Date Filing Date
EP19860904860 Pending EP0231316A1 (en) 1985-08-02 1986-07-31 Machine for engraving upstanding surfaces
EP19860904861 Pending EP0231317A1 (en) 1985-08-02 1986-07-31 Apparatus for engraving upstanding surfaces

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP19860904860 Pending EP0231316A1 (en) 1985-08-02 1986-07-31 Machine for engraving upstanding surfaces

Country Status (4)

Country Link
EP (2) EP0231316A1 (en)
AU (2) AU6198286A (en)
GB (4) GB2178370A (en)
WO (2) WO1987000801A1 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2759632B1 (en) * 1997-02-18 1999-04-23 Gilles Antoine ENGRAVING METHOD AND DEVICE
DE10257178A1 (en) * 2002-12-05 2004-06-17 Markator Manfred Borries Gmbh marking
CN102922930A (en) * 2012-10-30 2013-02-13 合肥力宇数控设备制造有限责任公司 Workpiece clamping mechanism of cylinder engraving machine
CN104227233A (en) * 2013-06-24 2014-12-24 刘德云 Vertical shadow engraving machine of tombstones
CN107415556A (en) * 2017-10-11 2017-12-01 宁波鄞州义旺电子科技有限公司 A kind of new metal incision device
CN109334320B (en) * 2018-10-13 2021-05-28 广东友邦光学科技股份有限公司 Detachable and assembled engraving machine capable of working in all directions
CN110142887A (en) * 2019-05-27 2019-08-20 深圳市创世纪机械有限公司 Localization tool for carving machine
CN110815586A (en) * 2019-11-22 2020-02-21 北京阿布塔斯科技有限公司 Established stone tablet engraving device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191513335A (en) * 1915-09-18 1916-07-13 Joseph Fink Keller Improvements in Engraving Machines.
AU511978B2 (en) * 1978-07-14 1980-09-18 Wayne Francis Hopkinson Engraving apparatus
NZ207890A (en) * 1983-04-26 1986-02-21 Doherty R G Kerb engraving machine attached to kerb by suction cups

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8700801A1 *

Also Published As

Publication number Publication date
GB8618680D0 (en) 1986-09-10
GB2183551A (en) 1987-06-10
GB2183550A (en) 1987-06-10
AU6197986A (en) 1987-03-05
WO1987000800A1 (en) 1987-02-12
WO1987000801A1 (en) 1987-02-12
GB8618683D0 (en) 1986-09-10
EP0231316A1 (en) 1987-08-12
GB8618681D0 (en) 1986-09-10
GB2178370A (en) 1987-02-11
GB2183549A (en) 1987-06-10
AU6198286A (en) 1987-03-05
GB8618682D0 (en) 1986-09-10

Similar Documents

Publication Publication Date Title
EP0231317A1 (en) Apparatus for engraving upstanding surfaces
AU656480B2 (en) A track tamping machine for tamping switches and crossings of a track
US4825768A (en) Mobile machine for leveling, lining and tamping a track switch
US4353399A (en) Multipurpose tool
HU213895B (en) Packing aggregate tamper for packing adjacent sleepers
CN214350210U (en) Spot welder is used in loudspeaker production with remove spot welder head function
KR950008032A (en) How to change the cutting tool of the platen press and the device to set the method to the work
HU210395B (en) Railway line-packing machine with line-packing aggregates adjustable in transversal and vertical direction
CN217179961U (en) Concrete finished product sampling device
CN217799062U (en) Drilling machine for construction
CN212761720U (en) Laser marking machine for sports equipment
CN209975520U (en) Inclination adjusting device of pile driver
CN214110305U (en) Positioning device for main steel tower segment of cable-stayed bridge
CN214720814U (en) Side drilling electric drill support is decorated to passenger train
CN214517737U (en) Hydraulic cylinder drilling device
CN217912976U (en) Beam slab deep drilling equipment for industrial and civil building engineering
CN213356327U (en) Paper positioning device of offset printing press
CN217632260U (en) Positioning device for drilling engineering pile
CN212803045U (en) Drilling device of hydraulic drilling machine equipment
CN219469447U (en) Civil engineering template lifting machine with stable clamping
CN218695121U (en) A engraver for sheet metal and tubular product processing
CN214613625U (en) Paving device suitable for bridge deck pavement
CN220849586U (en) Drilling machine capable of replacing mast
CN218292932U (en) Template strutting arrangement is used in building engineering construction
CN219112945U (en) Aluminium alloy drilling machine

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE FR IT LI LU NL SE

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

RIN1 Information on inventor provided before grant (corrected)

Inventor name: GORDON, DAVID, CHARLES

Inventor name: KENDALL, TREVOR, JOHN