GB2310703A - A manually adjustable damper/spring unit - Google Patents
A manually adjustable damper/spring unit Download PDFInfo
- Publication number
- GB2310703A GB2310703A GB9703940A GB9703940A GB2310703A GB 2310703 A GB2310703 A GB 2310703A GB 9703940 A GB9703940 A GB 9703940A GB 9703940 A GB9703940 A GB 9703940A GB 2310703 A GB2310703 A GB 2310703A
- Authority
- GB
- United Kingdom
- Prior art keywords
- piston
- adjuster
- rod
- spring
- coupled
- 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.)
- Withdrawn
Links
Classifications
-
- 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
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/44—Means on or in the damper for manual or non-automatic adjustment; such means combined with temperature correction
- F16F9/46—Means on or in the damper for manual or non-automatic adjustment; such means combined with temperature correction allowing control from a distance, i.e. location of means for control input being remote from site of valves, e.g. on damper external wall
- F16F9/464—Control of valve bias or pre-stress, e.g. electromagnetically
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G15/00—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type
- B60G15/02—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having mechanical spring
- B60G15/06—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having mechanical spring and fluid damper
- B60G15/062—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having mechanical spring and fluid damper the spring being arranged around the damper
- B60G15/063—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having mechanical spring and fluid damper the spring being arranged around the damper characterised by the mounting of the spring on the damper
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fluid-Damping Devices (AREA)
Abstract
A manually adjustable damper/spring unit comprises a flow control device having a piston plate 14 which is pressed, under the action of spring 15, so as to close control ports in a piston 13. Adjustment of adjuster rod 3, via knob 1, causes linear movement of retaining nut 16 so as to vary the force exerted by spring 15 against control plate 14, thereby altering the hydraulic resistance to relative rebound movement of the piston 13. A spring loaded detent arrangement 18, 19 limits the rotary adjustment of free end 2. A reserve tube body 27 forms an outer housing having an internally mounted pressure tube 34. Surrounding the body 27 is a spring 38 which is pre-loaded by adjuster nut 35. In another embodiment a further flow control device (113, 117, fig 4) is provided to control bump and/or impact relative movement of the piston 13.
Description
DAMPER / SPRING UNIT FOR A VEHICLE SUSPENSION SYSTEM
This invention relates to a damper / spring unit for a vehicle suspension system, and which comprises a tubular housing for receiving a hydraulic damping medium, an actuator rod mounted for linear reciprocation relative to said housing, a piston coupled with said rod and movable against controlled opposition of said damping medium, and an external compression spring surrounding the damper and arranged to provide resilient opposition to relative movement of said actuator rod.
Combined spring and damper units are well known for use in vehicle suspension systems, in which an external compression spring provides resilient opposition to upward movement of a vehicle wheel relative to the vehicle chassis, and the damper provides hydraulically controlled resistance to such movement via an internal piston and cylinder arrangement. The damper also usually provides hydraulically controlled resistance to rebound movement also. One well known example of a combined spring / damper unit is known as a McPherson strut.
It is well known to provide telescopically adjustable damper units for use in motorcycle suspension systems, in which the driver can adjust the resistance to vertical displacement in order to suit particular load and / or road conditions.
However, in connection with suspension systems of mass produced vehicles, it is usual for the dampers to be pre-set to particular resistance upon assembly, and not to provide any means of adjustment for use by the driver when required.
There are adjustable damper / spring units for use in vehicle suspension systems of specialist or more expensive vehicles, and which allows the driver to adjust the unit to any desired setting, but in connection with manually adjustable units, these are difficult to gain access to, and therefore adjustment is not as easy a task as one would like.
The present invention seeks to provide an adjustable damper / spring unit for use in a vehicle suspension system, which is easy to gain access to, and also to operate, so that the driver can carry out frequent adjustment of the setting of the unit if so required.
According to one aspect of the invention there is provided a damper / spring unit for a vehicle suspension system and which comprises:
a tubular housing (34) for receiving a hydraulic damping medium; a piston (13) having at least one control port and slidably mounted in said housing (34) for movement against controlled opposition of said damping medium;
a piston rod (26) coupled with said piston (13) and movably mounted relative to said housing (34);
an external spring (38) surrounding said housing (34) and arranged to provide resilient opposition to relative movement of the piston rod (26);
a flow control device (14, 17) for controlling the resistance to movement provided by the damping medium, said device comprising a control plate (14) engageable with the control port of the piston (13), and a biasing means (15) arranged to apply a biasing force to urge the control plate (14) towards engagement with the control port; and,
externally operable adjustment means (1, 2) coupled with the biasing means (15) and operable to vary the biasing force of the biasing means (15) so as to vary the resistance of the hydraulic damping medium to relative rebound movement of the piston (13).
Preferably, the biasing means comprises a compression spring arranged to press the control plate towards a closing position with respect to the control port of the piston.
An adjuster rod may extend internally of the piston rod, and may have a free end projecting from the piston rod, and an opposite end within the piston rod and which is coupled with the flow control device.
The free end of the adjuster rod is preferably arranged to be manually rotatable to vary the hydraulic resistance provided by the flow control device.
The opposite end of the adjuster rod may be coupled indirectly with the biasing means via a stop which is linearly adjustable as a consequence of rotary adjustment of the adjuster rod. A manually adjustable knob may be coupled with the free end of the adjuster rod. A preferred embodiment includes an adjuster rod extending internally of the piston rod and an opposite end within the piston rod and which is coupled with the flow control device, a manually adjustable knob coupled with said free end of the adjuster rod, and a springloaded detent coupled with the adjuster rod and operative to determine maximum and minimum positions of adjustment of the adjuster knob.
According to a further aspect of the invention there is provided a damper / spring unit for a vehicle suspension system and which comprises:
a tubular housing (112) for receiving a hydraulic damping medium;
a piston (135) having at least one control port and slidably mounted in said housing (112) for movement against controlled opposition of said damping medium;
a piston rod (143) coupled with said piston (135) and movably mounted relative to said housing (112);
an external spring (153) surrounding said housing (112) and arranged to provide resilient opposition to relative movement of the piston rod (143);
a flow control device (136, 139) for controlling the resistance to movement provided by the damping medium;
externally operable adjustment means (156) coupled with the flow control device and operable to vary the resistance of the hydraulic damping medium to relative rebound movement of the piston (135); and,
a foot valve which is externally adjustable in order to vary the resistance of the hydraulic damping medium to relative bump movement of the piston (135).
Preferably, in the further aspect of the invention, the flow control device comprises a control plate engageable with the control port of the piston, and biasing means arranged to apply a biasing force to the control plate towards engagement with the control port.
An adjuster rod may extend internally of the piston rod, and has a free end projecting from the piston rod, an adjuster knob coupled with the free end of the adjuster rod, and means connecting the opposite end of the adjuster rod with the control plate.
The foot valve may comprise an externally operable control knob, a poppet valve controllable by the operating knob, a valve plate urged into engagement with a valve seating, and communicating on one side with the interior of a pressure tube within which the piston is moveable, and communicating on its opposite side with a chamber having its pressure controlled by said poppet valve.
The foot valve may further comprise a foot valve housing and a capillary tube extending through the foot valve housing to allow the valve plate to communicate with both the interior of the pressure tube and with the chamber having its pressure controlled by the poppet valve.
The foot valve may still further comprise an adjuster nut and a compression spring which reacts between the poppet valve and the adjuster nut to provide controlled resistance to linear displacement of the damper / spring unit for relative bump movement of the piston.
The foot valve may also include a locating pin, cooperating with the adjuster nut, and an adjuster screw extending through the adjuster nut and coupled with the operating knob so as to provide axial displacement of the poppet valve assembly by external operation of the operating knob.
Preferred embodiments of damper / spring unit according to the invention, for use in a vehicle suspension system, will now be described in detail, by way of example only, with reference to the accompanying drawings, in which:
Figure 1 is a view of an upper half of a first embodiment of adjustable damper / spring unit according to the invention;
Figure 2 is a view of the lower half of the first embodiment;
Figure 3 is a view of the upper half of a second embodiment of the invention; and,
Figure 4 is a view of the lower half of the second embodiment.
Referring first to Figures 1 and 2 of the drawings, there is shown a first embodiment of the invention which comprises an adjustable damper / spring unit, which comprises a "top adjustable strut", and which is adjustable in rebound only.
The unit is intended primarily for use in a vehicle suspension system, and comprises a tubular housing for receiving a hydraulic damping medium, an actuator rod mounted for linear reciprocation relative to the housing, a piston coupled with the rod and movable against controlled opposition of the damping medium and an external compression spring surrounding the damper and arranged to provide resilient opposition to relative movement of the actuator rod.
The upper part of the unit is shown in Figure 1, and the lower half is shown in Figure 2. A lower foot 24 serves to mount the lower part of the unit, and the upper part of the unit, and an external compression spring 38, will be mounted on the suspension system by means not shown in detail, but which will be apparent to those of ordinary skill in the art. An adjuster drive rod 3 extends internally of the housing of the damper unit, and carries an adjuster screw 4, and can be externally adjusted via adjuster knob 1 and adjuster nut 2. An adjuster nut 7 is mounted on the rod 3, and a pair of axially spaced O-rings 5 is arranged one above, and one below the adjuster screw 4, as shown in Figure 2. Reference 6 denotes a grubscrew, and reference 8 denotes a cap head screw. A hexagonal nipple 9 is screwed into a lower part of the assembly, and a conical spring 10 reacts between nipple 9 and an upper piston plate 11. Reference 12 denotes a hexagonal collar 12, and the piston proper is designated by reference 13, with which there is an associated lower piston plate 14. A setting collar 17 is mounted at the lower end of the assembly, and a compression spring 15 reacts between collar 17 and a spring retaining unit 16, which can be locked to a lower threaded end of a downward projection from nut 7 via a grub screw 25.
Above the adjuster screw 4, a click action device is arranged, comprising detent pin 18 downwardly biased under the action of compression spring 19, and which defines (when engaged in one of a pair of detent recesses) maximum and minimum degrees of adjustment of the hydraulic resistance to rebound movement.
A reserve tube body 27 forms an outer housing of the unit, and a pressure tube 34 is mounted internally of tube body 27, and is centralised by centralising rings 20.
As mentioned above, a lower foot bracket 24 forms part of the lower mounting assembly of the unit, and in the bottom end of the unit there is arranged a foot valve body 21 and associated foot valve plate 22 and associated foot valve spring 23. The construction and arrangement of a foot valve assembly will be well known to those of ordinary skill in the art, and its function in controlling flow of a hydraulic damping medium provided within the damper unit.
A piston rod 26 (see Figure 1) is mounted slidably within the pressure tube 34, and enters the upper end of the unit via a sealed assembly comprising top screwed closure 28, O-ring 29, wiper seal 30 and O-ring 33. The O-ring 33 is carried by a
D.U. bush 32, mounted within rod guide 31.
Externally of the damper unit, there is a spring assembly, comprising coil spring 38 which seats at its lower end on an adjuster nut 35 which is adjustably mounted on externally threaded portion 37 and which, when required adjustment of the spring setting has been achieved, is locked in position by grubscrew 36.
A check rebound 39 (see Figure 2) is arranged internally of the pressure tube 24, and externally of the piston rod 26.
Finally, a circlip 40 (Figure 1) is mounted at the upper end of the piston rod 26.
The external spring 38 therefore can be adjusted in its pre-loading, by adjustment of external adjuster nut 35, and this permits the resilient opposition of the spring of the unit to be adjusted to suit requirements, with the compression spring providing resilient opposition to relative upward movement of the damper unit when a vehicle wheel hits a road bump. Internally of the unit, there is controlled hydraulic resistance to both upward and downward relative adjustment of the damper unit. However, the illustrated embodiment is adjustable in rebound only. However, what is believed to be unique in this embodiment is the easy access which is provided to enable manual adjustment of the hydraulic setting of the unit, and the fact that the adjustment means is entirely linear in its operation, which provides a unit which is easy to operate, and also easy to assemble in a vehicle suspension system.
Therefore, in the first embodiment shown in Figures 1 and 2, a flow control device is provided which is associated with the piston 13, and which is adjustable in order to vary the resistance of the hydraulic damping medium to relative movement of the piston. The control device comprises the piston plate 14, which is pressed with a biasing force towards a closed position with respect to control ports in the piston, under the action of compression spring 15 which reacts between retaining nut or stop 16, and the setting collar 17.
Angular adjustment of the adjuster rod 3 causes relative linear movement of the retaining nut 16, so as to vary the biasing force exerted by spring 15 against control plate 14.
Thus, retaining nut 16 is linearly adjustable as a consequence of rotary adjustment of the actuator rod, to vary the hydraulic resistance to relative rebound movement of the piston 13.
The spring loaded detent arrangement 18, 19 determines limit positions of rotary adjustment of the free end 2 of the adjuster rod 3.
Referring now to Figures 3 and 4, this shows a second embodiment of the invention, and this is a double adjustable shock absorber in the sense that it is independently adjustable in both bump mode and rebound mode. This damper unit has an externally mounted compression spring, and hydraulically controlled movement of a piston assembly internally of the unit against the action of a hydraulic damping medium.
In this second embodiment, the internal actuator rod and related piston assembly is generally similar to the first embodiment, but has different means of mounting the unit, and two different means for adjusting the "stiffness" of the unit by adjusting the hydraulic resistance to relative linear movement comprises adjustment mechanism provided at the upper and the lower end of the unit.
This embodiment comprises a hydraulic damper / spring unit, having a base control unit housing 101, and provided with a lower mounting provided by spherical bearing 124, and an upper mounting formed by top mounting eye 158. A reserve tube body 112 forms part of an outer housing of the unit, and piston rod 143 is slidably mounted internally of the unit, by being mounted slidably within a pressure tube 111.
A coil spring 153 is mounted externally of the unit, and reacts between an adjuster nut 150 which forms a lower spring seat, and which is adjustably mounted on an externally threaded portion 152. The upper end of spring 153 reacts against a spring retaining collet 157 mounted at the upper end of the unit. Any required pre-loading of the spring 153 is obtained by threaded adjustment of nut 150, until the required preloading is achieved, when a grubscrew 151 is operated to lock this particular position of adjustment.
Piston rod 143 is slidably mounted within the pressure tube 111, and enters the upper end of the unit via a top screwed closure 144, wiper seal 146 and D.U. bush 148, which carries O-ring 145. The bush 148 is mounted within a rod guide 147, and a further seal is provided at the entrance by means of
O-ring 149.
The upper end of the piston rod 143 is mounted within spring retaining collet 157, and pressing against top mounting eye 158 via a thrust bearing 155, and a top spherical bearing 124 is mounted in the top mounting eye 158.
This embodiment has both top and bottom adjustment means, and the top adjustment comprises an adjuster knob 156, which is adjustable to vary hydraulic resistance in rebound mode, and operating in generally similar manner to the adjustment of free end 2 of adjuster rod 3 of the first embodiment. Internally of pressure tube 111, there is arranged a check rebound 154. A lock nut 141 normally locks the upper end of piston rod 143 against rotation, but upon loosening, allows operation of the adjuster knob 156.
Turning now to the "piston assembly" slidable within pressure tube 111, the lower end of the rod 143 carries a piston 135 having associated lower piston plate 136, and a conical spring 132 reacts between upper piston plate 133 and hexagonal nipple 131. A downwardly projecting threaded portion of the nipple 131 has a collar 134 mounted on it, and below the collar 134 the piston assembly 135, 136 is also mounted on this threaded portion. A setting collar 139 fits loosely on the lower end of the threaded portion of the nipple 131, and a compression spring 137 is mounted on collar 139 at its upper end, and at its lower end is connected to a spring retaining nut 138. A grubscrew 142 secures the retaining nut 138 to a lower threaded portion of a rod which projects downwardly from adjuster nut 129. The nut 129 is mounted at a lower end of the piston rod 143, and is secured against rotation by a cap head screw 130. An adjuster drive rod 125 is rotatably mounted within piston rod 143, and adjuster screw 126 is coupled with drive rod 125, via a spring loaded detent arrangement comprising spring 123 and detent pin 140. O-rings 127 seal the adjuster screw 126. A lower threaded projection from adjuster screw 126 is received internally by adjuster nut 129, and in that cap head screw 130 holds the nut 129 captive against rotation, rotary adjustment of drive rod 125 will cause axial adjustment of the nut 129 and also of the spring retaining nut 138 carried thereby.
The bottom end of the unit will now be described, which comprises a so-called "foot valve" assembly which controls flow of the hydraulic damping medium in the unit, and there will also be described a manually operable bottom end manual adjustment i.e. a further flow control device which controls the hydraulic resistance to flow in the "bump mode".
An adapter block 122 is mounted at the bottom end of the assembly, and the foot valve assembly is mounted therein, which comprises a foot valve plate 113, a spring 114 and a foot valve housing 108. A capillary tube 110 extends upwardly through the housing 108, and provides communication between the chamber below the piston assembly within pressure tube 111, and a lower chamber in which a poppet valve 102 is mounted. Poppet valve 102 provides controlled resistance to linear displacement of the damper unit, and a compression spring 115 reacts between poppet valve 102 and an adjuster nut 103. An adjuster screw 104 extends through nut 103, and axial displacement of the valve assembly can be obtained by manual adjustment of control knob 105 acting through spring-loaded indent pin 106 and a screwed closure nut 107, the indent pin 106 being biased by compression spring 118. An O-ring 116 is arranged within the lower chamber, and a locating pin 109 also co-operates with adjuster nut 103.
The damper / spring unit shown in Figures 3 and 4 therefore provides an externally mounted compression spring, whose pre-load setting can be adjusted to suit requirements.
The hydraulic resistance of the hydraulic damping medium can be adjusted independently, in bump and rebound, by adjustment of control knob 105 and adjuster knob 156 respectively.
Claims (14)
1. A damper / spring unit for a vehicle suspension system and which comprises:
a tubular housing (34) for receiving a hydraulic damping medium; a piston (13) having at least one control port and slidably mounted in said housing (34) for movement against controlled opposition of said damping medium;
a piston rod (26) coupled with said piston (13) and movably mounted relative to said housing (34);
an external spring (38) surrounding said housing (34) and arranged to provide resilient opposition to relative movement of the piston rod (26);
a flow control device (14, 17) for controlling the resistance to movement provided by the damping medium, said device comprising a control plate (14) engageable with the control port of the piston (13), and a biasing means (15) arranged to apply a biasing force to urge the control plate (14) towards engagement with the control port; and,
externally operable adjustment means (1, 2) coupled with the biasing means (15) and operable to vary the biasing force of the biasing means (15) so as to vary the resistance of the hydraulic damping medium to relative rebound movement of the piston (13).
2. A unit according to Claim 1, in which the biasing means (15) comprises a compression spring arranged to press the control plate (14) towards a closing position with respect to the control port of the piston (13).
3. A unit according to Claim 1, including an adjuster rod (3) extending internally of the piston rod (26) and having a free end (2) projecting from the piston rod (26), and an opposite end within the piston rod (26) and which is coupled with the flow control device (14, 17).
4. A unit according to Claim 3, in which the free end (2) of the adjuster rod (3) is manually rotatable to vary the hydraulic resistance provided by the flow control device (14, 17).
5. A unit according to Claim 4, in which the opposite end of the adjuster rod (3) is coupled indirectly with the biasing means (15) via a stop (16) which is linearly adjustable as a consequence of rotary adjustment of the adjuster rod (3).
6. A unit according to Claim 5, including a manually adjustable knob (1) coupled with the free end (2) of the adjuster rod (3).
7. A unit according to Claim 1, including an adjuster rod (3) extending internally of the piston rod (26) and an opposite end within the piston rod (26) and which is coupled with the flow control device (14, 17), a manually adjustable knob (1) coupled with said free end (2) of the adjuster rod (3), and a spring-loaded detent (18, 19) coupled with the adjuster rod (3) and operative to determine maximum and minimum positions of adjustment of the adjuster knob (1).
8. A damper / spring unit for a vehicle suspension system and which comprises:
a tubular housing (112) for receiving a hydraulic damping medium;
a piston (135) having at least one control port and slidably mounted in said housing (112) for movement against controlled opposition of said damping medium;
a piston rod (143) coupled with said piston (135) and movably mounted relative to said housing (112);
an external spring (153) surrounding said housing (112) and arranged to provide resilient opposition to relative movement of the piston rod (143);
a flow control device (136, 139) for controlling the resistance to movement provided by the damping medium;
externally operable adjustment means (156) coupled with the flow control device and operable to vary the resistance of the hydraulic damping medium to relative rebound movement of the piston (135); and,
a foot valve which is externally adjustable in order to vary the resistance of the hydraulic damping medium to relative bump movement of the piston (135).
9. A unit according to Claim 8, in which the flow control device comprises a control plate (136) engageable with the (at least one) control port of the piston (135), and biasing means (137) arranged to apply a biasing force to the control plate (136) towards engagement with the control port.
10. A unit according to Claim 9, including an adjuster rod (125) extending internally of the piston rod (143), and having a free end projecting from the piston rod, an adjuster knob (156) coupled with the free end of the adjuster rod (125), and means connecting the opposite end of the adjuster rod (125) with the control plate (136).
11. A unit according to Claim 8, in which the foot valve comprises an externally operable control knob (105), a poppet valve (102) controllable by said operating knob (105), a valve plate (113) urged into engagement with a valve seating, and communicating on one side with the interior of a pressure tube (111) within which the piston (135) is movable, and communicating on its opposite side with a chamber having its pressure controlled by said poppet valve.
12. A unit according to claim 11, in which the foot valve further comprises a foot valve housing (108) and a capillary tube (11) extending through the foot valve housing to allow the valve plate (113) to communicate with both the interior of the pressure tube (111) and with the chamber having its pressure controlled by the poppet valve (102).
13. A unit according to claim 11, in which the foot valve further comprises an adjuster nut (103) and a compression spring (115) which reacts between the poppet valve (102) and said adjuster nut (103) to provide controlled resistance to linear displacement of the damper / spring unit for relative bump movement of the piston.
14. A unit according to claim 13, in which the foot valve further comprises a locating pin (109), co-operating with the adjuster nut (103), and an adjuster screw (104) extending through the adjuster nut (103) and coupled with the operating knob (105) so as to provide axial displacement of the poppet valve assembly by external operation of said operating knob (105).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9703940A GB2310703A (en) | 1996-02-27 | 1997-02-26 | A manually adjustable damper/spring unit |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GBGB9604079.5A GB9604079D0 (en) | 1996-02-27 | 1996-02-27 | Damper/spring unit for a vehicle suspension system |
| GB9614908A GB2310702A (en) | 1996-02-27 | 1996-07-16 | A manually adjustable damper/spring unit |
| GB9703940A GB2310703A (en) | 1996-02-27 | 1997-02-26 | A manually adjustable damper/spring unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9703940D0 GB9703940D0 (en) | 1997-04-16 |
| GB2310703A true GB2310703A (en) | 1997-09-03 |
Family
ID=27268147
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9703940A Withdrawn GB2310703A (en) | 1996-02-27 | 1997-02-26 | A manually adjustable damper/spring unit |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2310703A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2326691A (en) * | 1997-02-20 | 1998-12-30 | Tenneco Automotive Inc | Adjustable hydraulic shock absorber |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1415608A (en) * | 1973-12-21 | 1975-11-26 | Armstrong Patents Co Ltd | Improvements in and relating to telescopic hydraulic shock absorbers |
-
1997
- 1997-02-26 GB GB9703940A patent/GB2310703A/en not_active Withdrawn
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1415608A (en) * | 1973-12-21 | 1975-11-26 | Armstrong Patents Co Ltd | Improvements in and relating to telescopic hydraulic shock absorbers |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2326691A (en) * | 1997-02-20 | 1998-12-30 | Tenneco Automotive Inc | Adjustable hydraulic shock absorber |
| GB2326691B (en) * | 1997-02-20 | 2001-07-04 | Tenneco Automotive Inc | Adjustable hydraulic shock absorber |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9703940D0 (en) | 1997-04-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |