CA1163833A - Accelerometer protective structure - Google Patents
Accelerometer protective structureInfo
- Publication number
- CA1163833A CA1163833A CA000383952A CA383952A CA1163833A CA 1163833 A CA1163833 A CA 1163833A CA 000383952 A CA000383952 A CA 000383952A CA 383952 A CA383952 A CA 383952A CA 1163833 A CA1163833 A CA 1163833A
- Authority
- CA
- Canada
- Prior art keywords
- tubular member
- accelerometer
- adapter housing
- transducer assembly
- protective structure
- 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
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P1/00—Details of instruments
- G01P1/02—Housings
- G01P1/023—Housings for acceleration measuring devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
- F16F15/08—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with rubber springs ; with springs made of rubber and metal
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Acoustics & Sound (AREA)
- Aviation & Aerospace Engineering (AREA)
- Mechanical Engineering (AREA)
- Connector Housings Or Holding Contact Members (AREA)
- Vibration Prevention Devices (AREA)
- Mounting Of Printed Circuit Boards And The Like (AREA)
Abstract
ACCELEROMETER PROTECTIVE STRUCTURE
Abstract of the Disclosure An accelerometer with protective structure including an adapter housing having a chamber for receiving an accelerometer therein, an electrical connector for making electrical connections to said accelerometer and extended from an end of the adapter housing, and an elastomer layer encapsulating the adapter housing and part of the electrical connector and of sufficient thickness to protect the accelerometer against undesired impact and with a mounting face of the adapter housing exposed through the elastomer layer whereby the adapter housing can be accurately mounted to a supporting structure.
Abstract of the Disclosure An accelerometer with protective structure including an adapter housing having a chamber for receiving an accelerometer therein, an electrical connector for making electrical connections to said accelerometer and extended from an end of the adapter housing, and an elastomer layer encapsulating the adapter housing and part of the electrical connector and of sufficient thickness to protect the accelerometer against undesired impact and with a mounting face of the adapter housing exposed through the elastomer layer whereby the adapter housing can be accurately mounted to a supporting structure.
Description
1~63833 Back~round of the Invention This invention pertains to a protective structure for an accelerometer and, more particularly, to a protective structure for a transducer assembly which includes the accelerometer, an adapter housing for mounting of the accelerometer, and associated electrical components and interconnecting wiring.
A recently-developed weight and balance system for aircraft utilizes accelerometers as inclinometers to measure beam deflections and provide angle measurements which can be used in calculating the weight and balance of an aircraft.
The accelerometer used in this application is a servoed accelerometer, such as the Q-FLEX* accelerometer marketed by the assignee of this application, which has a quartz flexure and servo electronics all in one miniature package. This basic structure of an accelerometer is disclosed in Jacobs U.S. Patent No. 3,702,073 which issued November 7, 1972.
The use of the accelerometer in an aircraft weight and balance system is disclosed in the applicant's Canadian patent application serial number 365,404, filed November 25, 1980.
As disclosed in the aforesaid application, a number of accelerometers are mounted on the landing gear of the aircraft.
The accelerometer is a delicate precision instrument but must be capable of being handled by an average flight line *Trade Mark ' mechanic during initial installation of the accelerometer as part of the weight and balance system, as well as during in-service replacement due to malfunction.
A test device constructed similarly to an accelerometer and associated with mounting structure was subjected to controlled drop tests and a drop test of only two inches onto concrete recorded shock levels beyond those which the accelerometer is designed to survive and, therefore, without protective structure it is possible that any accidental dropping of the accelerometer would result in damage to the accelerometer, rendering it inoperable.
Summary of the Invention A primary feature of the invention disclosed herein is to provide a protective structure for an accelerometer which improves the ability of the accelerometer to withstand undesired impacts and thus reduce the likelihood of damage to the accelerometer.
The protective structure enables the use of a small, delicate precision instrument, normally handled by electronic technicians, in a severe environment, such as on a large, rugged aircraft landing gear and maintenance thereof by personnel trained to handle rugged aircraft equipment.
In carrying out the foregoing, the accelerometer is mounted within an adapter housing and this structure as well as associated electrical components and interconnected wiring are encapsulated within an elastomer potting compound whereby there is a wall thickness of the compound surrounding the encapsulated structure with exposed mounting faces of the adapter housing recessed from the surface of the compound layer. A particularly suitable elastomer compound for encapsulating the structure is a silicone rubber which reduces shock impact and which also has good :1~6.~33 resistance to hydraulic fluid and jet engine fuel with which the silicone rubber might come in contact.
An object of the invention is to provide an accelerometer with protective structure comprising, an adapter housing having a central chamber for receiving the accelerometer therein, an electrical connector for making electrical connections to said accelerometer extended from an end of the adapter housing, and an elastomer potting compound encapsulating said a~apter housing and part of the electrical connector and of sufficient thickness to protect the acceleromter against undesired impact.
Stili another object of the invention is to provide a transducer assembly with protective structure comprising, an adapter housing having a mounting face and a central chamber open at one end, an accelerometer mounted in said central chamber with an accelerometer header at said open end, an electrical connector adjacent the mounting face, a connector bracket secured to the electrical connector and having a pair of tabs fastened to said adapter housing, electrical wiring between the accelerometer header and said electrical connector, a pair of passages extending lengthwise of the adapter housing and through which the electrical wiring extends, a second pair of passages extending lengthwise of the adapter housing and opening to said mounting face for receiving fastening members, and a layer of silicone rubber surrounding said adapter housing and at both ends thereof to completel~ enclose the adapter housing and said electrical wiring, except for opening in said layer for access to said second pair of passages and parts of the mounting face adjacent thereto.
Still another object of the invention is to provide a structure, as defined in the preceding paragraphs, wherein the accelerometer is cantilever-mounted in the chamber of the adapter housing for further isolation of the accelerometer against shock impact.
~6~33 Brief Description of the Drawing Fig. 1 is a perspective front view of the encapsulated transducer assembly;
Fig. 2 is a perspective rear view of the transducer assembly prior to encapsulation;
Fig. 3 is a vertical section through the adapter housing, showing the accelerometer positioned therein and a gluing fixture, in broken line, associated therewith during mounting of the accelerometer into the adapter housing;
Fig. 4 is an exploded front perspective view of the adapter housing and certain parts associated therewith;
Fig. 5 is a central, vertical section of the encapsulated structure, shown in Fig. 1, and with certain interior components shown in elevation;
Fig. 6 is a transverse sectional view of an aircraft centerline gear axle showing a pair of encapsulated transducer assemblies associated therewith; and Fig. 7 is a transverse sectional view of an aircraft nose gear axle showing a pair of encapsulated transducer assemblies associated therewith.
Description of the Preferred Embodiment The encapsulated transducer assembly T is shown in Figs. 1 and 5 with the transducer assembly before encapsulation being shown in Fig. 2. The transducer assembly includes an adapter housing 10 having a central chamber 11 (Fig. 3) which mounts an accelerometer A having a cylindrical casing 12 and an accelerometer header 15 at one end thereof. As stated previously, an accelerometer of the type usable herein may be of the type disclosed in Jacobs U.S. Patent No. 3,702,073. The accelerometer is cantilever-mounted within the adapter housing chamber for reduced thermal conductivity, by being glued along a glue 6~ 3 line 16 to a wall of an inner section 17 of the chamber 11 and with an outer section of the chamber having a greater diameter to be spaced further from the casing 12 of the accelerometer. A tapered gluing fixture 20, indicated by broken line in Fig. 3, is used to positiGn the accelerometer within the chamber 11 during the assembly operation.
The adapter housing 10 is generally elliptical in cross-section and has one side 25 which is arcuately curved and with the opposite side being made up of several planar faces including a central face 26 and a pair of inclined faces 27 and 28 which provide mounting faces for a number of components. An end 29 of the adapter housing provides a mounting face for the transducer assembly and with the central chamber 11 opening to the opposite face 30 of the adapter housing and with the accelerometer header 15 extending therebeyond.
An electrical connector 35 has an exposed, threaded end 36 and is mounted to the adapter housing 10 by means of a connector bracket 37. The connector bracket 37 has a relatively thin annular body with a pair of bent tabs 38 and 39, each of which has an aperture and as shown at 40 for the tab 38. The annular body of the connector bracket abuts against an annular base flange 45 of the electrical connector 36 and surrounds a reduced diameter section 46 of the electrical connector which fits into the central opening of the connector bracket, and with these parts being ~oldered together. The connector bracket tabs 38 and 39 engage cut-back surfaces 48 and 49 on the adapter housing faces 27 and 28, with the apertures in the tabs aligned with threaded openings which extend into the adapter housing.
The electrical connector bracket tabs 38 and 39 are secured to the adapter housing by respective screws 50 and 51 which pass through openings in a pair of safety wire brackets 52 and 53 which are superimposed upon the respective tabs 38 and 39 and with the parts shown in assembled relation in Figs. 2 and 5.
~16~33 Each of the safety wire brackets 52 and 53 have an L-shaped leg 54 and 55, respectively, extending therefrom having an aperture in the free end thereof for connection of a safety wire thereto during mounting of the transducer assembly.
As shown particularly in Fig. 2, the accelerometer header has a number of pins 60 which have the ends of wires soldered thereto and with there being four groups of wires extending from the accelerometer header. One group of wires, as indicated at 61, passes through a passage 62 extending longitudinally of the adapter housing 10, with a second group of wires 63 passing through a ~imilar longitudinally-extending passage. The passage 62 terminates at the mounting face 29 of the adapter housing in an undercut transverse passage 64 whereby the group of wires 61 extending through the passage may extend into the interior of the electrical connector 36, The second longitudinally-extending passage terminates in an undercut passage 65 (Fig.
4) wherein the group of wires 63 can extend into the interior of the electrical connector 36. The aforesaid groups of wires are electrically connected to the inner ends of pins P extending outwardly within the sleeve of electrical connector 36. Additional sets of wires 66 and 67 extend to electronic component boards 68 and 69 which are mounted on the faces 27 and 28 of the adapter housing.
A second set of passages 70 and 71 extends lengthwise throughout the adapter housing 10 and the passages provide mountings for a pair of socket head cap screws 72 and 73 which are retained against removal by a threaded section at one end of the passage, as shown at 74 for the passage 72, and with a lock washer 75 captured under the head of each of the cap screws.
In assembly, the components shown in Fig. 4 are assembled in the manner previously described, with the electrical wiring associated therewith to form the transducer as~embly shown in Fig. 2 and without the socket head cap screws 72 and 73. The structure shown in Fig. 2 is then placed in a potting fixture with suitable fixture elements to prevent entry of potting compound into the second pair of passages 70 and 71 in the adapter housing and also to expose the free ends of the safety wire bracket legs 54 and 55. This structure is then encapsulated in an elastomer potting compound, preferably a silicone rubber, such as RTV-60 silicone rubber MFR, of General Electrical Company. This compound has good resistance to hydraulic fluid and jet engine fuel.
The encapsulated transducer assembly is shown in Fig.
1 and in section in Fig. 5 wherein a layer of potting compound surrounds the sides and encloses the ends of the adapter housing and encloses the structure associated therewith including the electrical wiring except for an exposed end of the electrical connector 36, the second pair of passages 70 and 71, parts of the mounting face 29 of the adapter housing surrounding said passages 70 and 71, and the free ends of the safety wire bracket legs 54 and 55.
Thereafter, the socket head cap screws can be associated with the adapter housing, as shown in Fig. 5, and the transducer assembly with protective structure is in its final form for use and protected against undesired impacts.
More particularly, the layer of elastomer material extends completely around the sides of the adapter housing 10, without interruption, with this section of the layer being indicated at 80. A section 81 of the layer extends beyond the end 30 of the adapter housing and encloses the wiring associated with the accelerometer header 15 and is continuous except for openings 82 and 83 for access to the socket head cap screws 72 and 73. A section 85 of the protective layer encloses the base flange 45 of the electrical connector 36 as well as the connector bracket 37 and spans the entire mounting face 29 of the adapter housing ~l.6;~33 except for parts thereof surrounding the second pair of passages 70 and 71 to provide surfaces to accurately abut a mounting structure and with the safety wire bracket legs exposed for connection of a safety wire to one or b~th of the brackets. The recessing of the layer section 85 to set back parts of the mounting face 29 protects the mounting surface parts from being damaged.
The transducer assembly T with protective structure must be as small as possible for mounting in a desired location. The size of the transducer assembly T as well as the sha~e thereof contribute to ease of location and mounting.
The transducer assembly with protective structure has ~n elongate body with a concave-convex cross section and which may be defined as a kidney shape. Referring to Figs.
1, 6 and 7, the shaping of the body provides the convex portion 90 and the concave portion 91. This shape facilitates locating and mounting of the structure within a tubular member, such as an axle for an aircraft landing gear. In Fig. 6, the centerline gear axle of an aircraft landing gear is shown in transverse section as a tubular member 92. A pair of the transducer assemblies T are mounted therein with the convex surfaces 90 thereof lying closely adjacent to the interior surface of the curved wall of the tubular member and with the concave surfaces 91 spaced from the axis of the tubular member and shaped to be closely adjacent to and partially surround structure which may be mounted axially of the tubular member, such as a transducer device used for other purposes.
A nose gear axle is shown in transverse section in Fig. 7 and has a tubular member 95 with a pair of the transducer assemblies T mounted therein and substantially filling the interior space within the tubular member 95.
The convex surfaces 90 have a curvature substantially the same as the interior surface of the wall of the tubular ~L~6~ 33 member g5 and the concave surfaces 91 of the two transducer assemblies T are in opposed closely-spaced relation.
In addition to the protective layer of resilient material to reduce damage against undesired impact and severe usage, the cantilever mounting of the accelerometer within the adapter housing 10 further reduces shock as does the shock-mounting of the electrical connector by means of only the two tabs 38 and 39 of the connector bracket 37 and with the base of the electrical connector being entirely embedded within the layer of protective material.
A recently-developed weight and balance system for aircraft utilizes accelerometers as inclinometers to measure beam deflections and provide angle measurements which can be used in calculating the weight and balance of an aircraft.
The accelerometer used in this application is a servoed accelerometer, such as the Q-FLEX* accelerometer marketed by the assignee of this application, which has a quartz flexure and servo electronics all in one miniature package. This basic structure of an accelerometer is disclosed in Jacobs U.S. Patent No. 3,702,073 which issued November 7, 1972.
The use of the accelerometer in an aircraft weight and balance system is disclosed in the applicant's Canadian patent application serial number 365,404, filed November 25, 1980.
As disclosed in the aforesaid application, a number of accelerometers are mounted on the landing gear of the aircraft.
The accelerometer is a delicate precision instrument but must be capable of being handled by an average flight line *Trade Mark ' mechanic during initial installation of the accelerometer as part of the weight and balance system, as well as during in-service replacement due to malfunction.
A test device constructed similarly to an accelerometer and associated with mounting structure was subjected to controlled drop tests and a drop test of only two inches onto concrete recorded shock levels beyond those which the accelerometer is designed to survive and, therefore, without protective structure it is possible that any accidental dropping of the accelerometer would result in damage to the accelerometer, rendering it inoperable.
Summary of the Invention A primary feature of the invention disclosed herein is to provide a protective structure for an accelerometer which improves the ability of the accelerometer to withstand undesired impacts and thus reduce the likelihood of damage to the accelerometer.
The protective structure enables the use of a small, delicate precision instrument, normally handled by electronic technicians, in a severe environment, such as on a large, rugged aircraft landing gear and maintenance thereof by personnel trained to handle rugged aircraft equipment.
In carrying out the foregoing, the accelerometer is mounted within an adapter housing and this structure as well as associated electrical components and interconnected wiring are encapsulated within an elastomer potting compound whereby there is a wall thickness of the compound surrounding the encapsulated structure with exposed mounting faces of the adapter housing recessed from the surface of the compound layer. A particularly suitable elastomer compound for encapsulating the structure is a silicone rubber which reduces shock impact and which also has good :1~6.~33 resistance to hydraulic fluid and jet engine fuel with which the silicone rubber might come in contact.
An object of the invention is to provide an accelerometer with protective structure comprising, an adapter housing having a central chamber for receiving the accelerometer therein, an electrical connector for making electrical connections to said accelerometer extended from an end of the adapter housing, and an elastomer potting compound encapsulating said a~apter housing and part of the electrical connector and of sufficient thickness to protect the acceleromter against undesired impact.
Stili another object of the invention is to provide a transducer assembly with protective structure comprising, an adapter housing having a mounting face and a central chamber open at one end, an accelerometer mounted in said central chamber with an accelerometer header at said open end, an electrical connector adjacent the mounting face, a connector bracket secured to the electrical connector and having a pair of tabs fastened to said adapter housing, electrical wiring between the accelerometer header and said electrical connector, a pair of passages extending lengthwise of the adapter housing and through which the electrical wiring extends, a second pair of passages extending lengthwise of the adapter housing and opening to said mounting face for receiving fastening members, and a layer of silicone rubber surrounding said adapter housing and at both ends thereof to completel~ enclose the adapter housing and said electrical wiring, except for opening in said layer for access to said second pair of passages and parts of the mounting face adjacent thereto.
Still another object of the invention is to provide a structure, as defined in the preceding paragraphs, wherein the accelerometer is cantilever-mounted in the chamber of the adapter housing for further isolation of the accelerometer against shock impact.
~6~33 Brief Description of the Drawing Fig. 1 is a perspective front view of the encapsulated transducer assembly;
Fig. 2 is a perspective rear view of the transducer assembly prior to encapsulation;
Fig. 3 is a vertical section through the adapter housing, showing the accelerometer positioned therein and a gluing fixture, in broken line, associated therewith during mounting of the accelerometer into the adapter housing;
Fig. 4 is an exploded front perspective view of the adapter housing and certain parts associated therewith;
Fig. 5 is a central, vertical section of the encapsulated structure, shown in Fig. 1, and with certain interior components shown in elevation;
Fig. 6 is a transverse sectional view of an aircraft centerline gear axle showing a pair of encapsulated transducer assemblies associated therewith; and Fig. 7 is a transverse sectional view of an aircraft nose gear axle showing a pair of encapsulated transducer assemblies associated therewith.
Description of the Preferred Embodiment The encapsulated transducer assembly T is shown in Figs. 1 and 5 with the transducer assembly before encapsulation being shown in Fig. 2. The transducer assembly includes an adapter housing 10 having a central chamber 11 (Fig. 3) which mounts an accelerometer A having a cylindrical casing 12 and an accelerometer header 15 at one end thereof. As stated previously, an accelerometer of the type usable herein may be of the type disclosed in Jacobs U.S. Patent No. 3,702,073. The accelerometer is cantilever-mounted within the adapter housing chamber for reduced thermal conductivity, by being glued along a glue 6~ 3 line 16 to a wall of an inner section 17 of the chamber 11 and with an outer section of the chamber having a greater diameter to be spaced further from the casing 12 of the accelerometer. A tapered gluing fixture 20, indicated by broken line in Fig. 3, is used to positiGn the accelerometer within the chamber 11 during the assembly operation.
The adapter housing 10 is generally elliptical in cross-section and has one side 25 which is arcuately curved and with the opposite side being made up of several planar faces including a central face 26 and a pair of inclined faces 27 and 28 which provide mounting faces for a number of components. An end 29 of the adapter housing provides a mounting face for the transducer assembly and with the central chamber 11 opening to the opposite face 30 of the adapter housing and with the accelerometer header 15 extending therebeyond.
An electrical connector 35 has an exposed, threaded end 36 and is mounted to the adapter housing 10 by means of a connector bracket 37. The connector bracket 37 has a relatively thin annular body with a pair of bent tabs 38 and 39, each of which has an aperture and as shown at 40 for the tab 38. The annular body of the connector bracket abuts against an annular base flange 45 of the electrical connector 36 and surrounds a reduced diameter section 46 of the electrical connector which fits into the central opening of the connector bracket, and with these parts being ~oldered together. The connector bracket tabs 38 and 39 engage cut-back surfaces 48 and 49 on the adapter housing faces 27 and 28, with the apertures in the tabs aligned with threaded openings which extend into the adapter housing.
The electrical connector bracket tabs 38 and 39 are secured to the adapter housing by respective screws 50 and 51 which pass through openings in a pair of safety wire brackets 52 and 53 which are superimposed upon the respective tabs 38 and 39 and with the parts shown in assembled relation in Figs. 2 and 5.
~16~33 Each of the safety wire brackets 52 and 53 have an L-shaped leg 54 and 55, respectively, extending therefrom having an aperture in the free end thereof for connection of a safety wire thereto during mounting of the transducer assembly.
As shown particularly in Fig. 2, the accelerometer header has a number of pins 60 which have the ends of wires soldered thereto and with there being four groups of wires extending from the accelerometer header. One group of wires, as indicated at 61, passes through a passage 62 extending longitudinally of the adapter housing 10, with a second group of wires 63 passing through a ~imilar longitudinally-extending passage. The passage 62 terminates at the mounting face 29 of the adapter housing in an undercut transverse passage 64 whereby the group of wires 61 extending through the passage may extend into the interior of the electrical connector 36, The second longitudinally-extending passage terminates in an undercut passage 65 (Fig.
4) wherein the group of wires 63 can extend into the interior of the electrical connector 36. The aforesaid groups of wires are electrically connected to the inner ends of pins P extending outwardly within the sleeve of electrical connector 36. Additional sets of wires 66 and 67 extend to electronic component boards 68 and 69 which are mounted on the faces 27 and 28 of the adapter housing.
A second set of passages 70 and 71 extends lengthwise throughout the adapter housing 10 and the passages provide mountings for a pair of socket head cap screws 72 and 73 which are retained against removal by a threaded section at one end of the passage, as shown at 74 for the passage 72, and with a lock washer 75 captured under the head of each of the cap screws.
In assembly, the components shown in Fig. 4 are assembled in the manner previously described, with the electrical wiring associated therewith to form the transducer as~embly shown in Fig. 2 and without the socket head cap screws 72 and 73. The structure shown in Fig. 2 is then placed in a potting fixture with suitable fixture elements to prevent entry of potting compound into the second pair of passages 70 and 71 in the adapter housing and also to expose the free ends of the safety wire bracket legs 54 and 55. This structure is then encapsulated in an elastomer potting compound, preferably a silicone rubber, such as RTV-60 silicone rubber MFR, of General Electrical Company. This compound has good resistance to hydraulic fluid and jet engine fuel.
The encapsulated transducer assembly is shown in Fig.
1 and in section in Fig. 5 wherein a layer of potting compound surrounds the sides and encloses the ends of the adapter housing and encloses the structure associated therewith including the electrical wiring except for an exposed end of the electrical connector 36, the second pair of passages 70 and 71, parts of the mounting face 29 of the adapter housing surrounding said passages 70 and 71, and the free ends of the safety wire bracket legs 54 and 55.
Thereafter, the socket head cap screws can be associated with the adapter housing, as shown in Fig. 5, and the transducer assembly with protective structure is in its final form for use and protected against undesired impacts.
More particularly, the layer of elastomer material extends completely around the sides of the adapter housing 10, without interruption, with this section of the layer being indicated at 80. A section 81 of the layer extends beyond the end 30 of the adapter housing and encloses the wiring associated with the accelerometer header 15 and is continuous except for openings 82 and 83 for access to the socket head cap screws 72 and 73. A section 85 of the protective layer encloses the base flange 45 of the electrical connector 36 as well as the connector bracket 37 and spans the entire mounting face 29 of the adapter housing ~l.6;~33 except for parts thereof surrounding the second pair of passages 70 and 71 to provide surfaces to accurately abut a mounting structure and with the safety wire bracket legs exposed for connection of a safety wire to one or b~th of the brackets. The recessing of the layer section 85 to set back parts of the mounting face 29 protects the mounting surface parts from being damaged.
The transducer assembly T with protective structure must be as small as possible for mounting in a desired location. The size of the transducer assembly T as well as the sha~e thereof contribute to ease of location and mounting.
The transducer assembly with protective structure has ~n elongate body with a concave-convex cross section and which may be defined as a kidney shape. Referring to Figs.
1, 6 and 7, the shaping of the body provides the convex portion 90 and the concave portion 91. This shape facilitates locating and mounting of the structure within a tubular member, such as an axle for an aircraft landing gear. In Fig. 6, the centerline gear axle of an aircraft landing gear is shown in transverse section as a tubular member 92. A pair of the transducer assemblies T are mounted therein with the convex surfaces 90 thereof lying closely adjacent to the interior surface of the curved wall of the tubular member and with the concave surfaces 91 spaced from the axis of the tubular member and shaped to be closely adjacent to and partially surround structure which may be mounted axially of the tubular member, such as a transducer device used for other purposes.
A nose gear axle is shown in transverse section in Fig. 7 and has a tubular member 95 with a pair of the transducer assemblies T mounted therein and substantially filling the interior space within the tubular member 95.
The convex surfaces 90 have a curvature substantially the same as the interior surface of the wall of the tubular ~L~6~ 33 member g5 and the concave surfaces 91 of the two transducer assemblies T are in opposed closely-spaced relation.
In addition to the protective layer of resilient material to reduce damage against undesired impact and severe usage, the cantilever mounting of the accelerometer within the adapter housing 10 further reduces shock as does the shock-mounting of the electrical connector by means of only the two tabs 38 and 39 of the connector bracket 37 and with the base of the electrical connector being entirely embedded within the layer of protective material.
Claims (4)
1. A transducer assembly with protective structure usable with an aircraft landing gear having a tubular member defining an axle for said landing gear, said protective structure being elongate and shaped to have a generally kidney-shaped concave-convex cross section whereby the assembly can be mounted lengthwise in said tubular member and said cross section providing a contour to fit within a minimum space in said tubular member.
2. A transducer assembly as defined in claim 1 wherein a pair of said transducer assemblies can be mounted in said tubular member in opposed relation, with the convex surfaces thereof positioned closely adjacent the interior of the wall of the tubular member and having the same curvature as the tubular member.
3. A transducer assembly as defined in claim 2 wherein said concave surface enables the transducer assembly to partially surround structure positioned axially of the tubular member.
4. A transducer assembly with protective structure in combination with an aircraft landing gear and positioned within a tubular member defining an axle for said landing gear, said transducer assembly having a concave-convex cross section whereby the exterior of the convex portion thereof has a curvature with a diameter providing a contour corresponding to that of the wall of the tubular member and the concave
4. A transducer assembly with protective structure in combination with an aircraft landing gear and positioned within a tubular member defining an axle for said landing gear, said transducer assembly having a concave-convex cross section whereby the exterior of the convex portion thereof has a curvature with a diameter providing a contour corresponding to that of the wall of the tubular member and the concave
Claim 4 continued...
portion has an exterior with a curvature shaped to the contour of a member disposed axially of the tubular member whereby the transducer assembly is positioned intermediate the axis and the wall of the tubular member.
portion has an exterior with a curvature shaped to the contour of a member disposed axially of the tubular member whereby the transducer assembly is positioned intermediate the axis and the wall of the tubular member.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US18905480A | 1980-09-22 | 1980-09-22 | |
| US189,054 | 1980-09-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1163833A true CA1163833A (en) | 1984-03-20 |
Family
ID=22695717
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000383952A Expired CA1163833A (en) | 1980-09-22 | 1981-08-14 | Accelerometer protective structure |
Country Status (10)
| Country | Link |
|---|---|
| JP (1) | JPS5784361A (en) |
| AU (1) | AU522709B2 (en) |
| CA (1) | CA1163833A (en) |
| DE (1) | DE3129697A1 (en) |
| DK (1) | DK417781A (en) |
| FR (1) | FR2490828A1 (en) |
| GB (1) | GB2084330B (en) |
| IT (1) | IT8149330A0 (en) |
| NL (1) | NL8104355A (en) |
| SE (1) | SE8104814L (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4572204A (en) * | 1984-03-21 | 1986-02-25 | Hewlett-Packard Company | Pressure dome with compliant chamber |
| ATE73235T1 (en) * | 1987-12-22 | 1992-03-15 | Kistler Instrumente Ag | ACCELEROMETER. |
| US4947690A (en) * | 1989-06-29 | 1990-08-14 | Allied-Signal Inc. | Acceletometers adapted for efficient connection and disconnection |
| US5237871A (en) * | 1990-10-12 | 1993-08-24 | Teledyne Industries Incorporated | Vibration attenuation assembly with venting passageway |
| US5117695A (en) * | 1990-10-12 | 1992-06-02 | Teledyne Industries, Inc. | Vibration attenuation assembly |
| JPH04297875A (en) * | 1990-10-19 | 1992-10-21 | Lucas Ind Plc | Component attaching arrangement |
| JPH088453Y2 (en) * | 1991-04-15 | 1996-03-06 | 日本航空電子工業株式会社 | Accelerometer |
| US5345822A (en) * | 1991-06-28 | 1994-09-13 | Murata Manufacturing Co., Ltd. | Vibratory gyroscope having a support member |
| DE9111106U1 (en) * | 1991-09-07 | 1993-01-07 | Robert Bosch Gmbh, 7000 Stuttgart | Sensor for automatically triggering occupant protection devices in motor vehicles |
| FR2682766B1 (en) * | 1991-10-21 | 1995-07-13 | Asulab Sa | SENSOR FOR MEASURING A PHYSICAL SIZE. |
| JPH05164775A (en) * | 1991-12-17 | 1993-06-29 | Atsugi Unisia Corp | Acceleration sensor |
| EP0566758B2 (en) * | 1992-04-22 | 1999-09-08 | Siemens Aktiengesellschaft | Detector unit for controlling a passenger protection system of a vehicle |
| US7584660B2 (en) | 2005-07-06 | 2009-09-08 | Prueftechnik Dieter Busch Ag | Shock isolation system for an inertial sensor arrangement |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR725860A (en) * | 1930-11-10 | 1932-05-19 | Kabelfabrik Ag | Connection device for power lines |
| US3307054A (en) * | 1959-09-15 | 1967-02-28 | Endevco Corp | Accelerometer |
| US3581084A (en) * | 1967-11-10 | 1971-05-25 | Sumitomo Electric Industries | Piezoelectric wheel-axle detector |
| US3702073A (en) * | 1969-02-28 | 1972-11-07 | Sundstrand Data Control | Accelerometer |
| FR2116922A5 (en) * | 1970-12-11 | 1972-07-21 | Anvar | Inertial transducer - for acceleration or vibration measurement coated with polyester phenolic or epoxy varnish |
| US3911388A (en) * | 1973-09-21 | 1975-10-07 | Houston Products And Services | Accelerometer |
-
1981
- 1981-07-24 AU AU73385/81A patent/AU522709B2/en not_active Ceased
- 1981-07-28 DE DE19813129697 patent/DE3129697A1/en not_active Withdrawn
- 1981-08-13 SE SE8104814A patent/SE8104814L/en not_active Application Discontinuation
- 1981-08-14 CA CA000383952A patent/CA1163833A/en not_active Expired
- 1981-09-21 IT IT8149330A patent/IT8149330A0/en unknown
- 1981-09-21 DK DK417781A patent/DK417781A/en not_active Application Discontinuation
- 1981-09-21 FR FR8117758A patent/FR2490828A1/en active Pending
- 1981-09-21 GB GB8128444A patent/GB2084330B/en not_active Expired
- 1981-09-22 JP JP56148901A patent/JPS5784361A/en active Pending
- 1981-09-22 NL NL8104355A patent/NL8104355A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| DE3129697A1 (en) | 1982-04-15 |
| DK417781A (en) | 1982-03-23 |
| GB2084330A (en) | 1982-04-07 |
| AU522709B2 (en) | 1982-06-24 |
| JPS5784361A (en) | 1982-05-26 |
| GB2084330B (en) | 1984-07-04 |
| SE8104814L (en) | 1982-03-23 |
| IT8149330A0 (en) | 1981-09-21 |
| AU7338581A (en) | 1982-04-01 |
| FR2490828A1 (en) | 1982-03-26 |
| NL8104355A (en) | 1982-04-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA1163833A (en) | Accelerometer protective structure | |
| US8025445B2 (en) | Method of deployment for real time casing imaging | |
| WO2010042507A1 (en) | Fanout cable assembly and method | |
| EP0542436A1 (en) | Accelerometer | |
| US5416881A (en) | Optical fiber and optical waveguide connecting device | |
| US5046968A (en) | Electrical connector contact having an electrical component disposed in a central internal cavity | |
| NL9002599A (en) | Probe assemblies for use in boreholes. | |
| US7660193B2 (en) | Integrated seismic sensor cable | |
| US4198990A (en) | Mouth mounted accelerometer pack | |
| WO2003029776A2 (en) | Rake thermocouple | |
| DK169653B1 (en) | Shear type piezoelectric accelerometer | |
| US5117695A (en) | Vibration attenuation assembly | |
| JP3047076B2 (en) | Method for encapsulating optical components for interconnecting optical fibers and encapsulated components | |
| US20120285270A1 (en) | Device for measuring wall values | |
| US5237871A (en) | Vibration attenuation assembly with venting passageway | |
| CN205207515U (en) | Along with boring inclinometer bumper shock absorber | |
| GB2114757A (en) | Inductive bore gauges | |
| DE102012109580A1 (en) | Sensor arrangement and method for producing a sensor arrangement | |
| CN219434887U (en) | Batch test cable device | |
| TWM629465U (en) | EMI shielding member and optical fiber adapter module having EMI shielding member | |
| CN210072294U (en) | Shock isolation damping system | |
| CN220233329U (en) | Battery pack and electric tool | |
| CN221147637U (en) | Mining inertial navigation device | |
| RU2026556C1 (en) | Piezoelectric accelerometer | |
| SE8300194D0 (en) | INSTRUMENT ASSEMBLY |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |