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
  • F16F9/3207—Constructional features
  • F16F9/3235—Constructional features of cylinders
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
  • B21C37/00—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
  • B21C37/06—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
  • B21C37/15—Making tubes of special shape; Making tube fittings
  • B21C37/20—Making helical or similar guides in or on tubes without removing material, e.g. by drawing same over mandrels, by pushing same through dies ; Making tubes with angled walls, ribbed tubes or tubes with decorated walls
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
  • B21C37/00—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
  • B21C37/06—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
  • B21C37/15—Making tubes of special shape; Making tube fittings
  • B21C37/20—Making helical or similar guides in or on tubes without removing material, e.g. by drawing same over mandrels, by pushing same through dies ; Making tubes with angled walls, ribbed tubes or tubes with decorated walls
  • B21C37/202—Making helical or similar guides in or on tubes without removing material, e.g. by drawing same over mandrels, by pushing same through dies ; Making tubes with angled walls, ribbed tubes or tubes with decorated walls with guides parallel to the tube axis
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
  • B21H7/00—Making articles not provided for in the preceding groups, e.g. agricultural tools, dinner forks, knives, spoons
  • B21H7/18—Making articles not provided for in the preceding groups, e.g. agricultural tools, dinner forks, knives, spoons grooved pins; Rolling grooves, e.g. oil grooves, in articles
  • B21H7/187—Rolling helical or rectilinear grooves
• • 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
  • F16F9/02—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum
  • F16F9/0209—Telescopic
  • F16F9/0218—Mono-tubular units
• • 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
  • F16F9/3207—Constructional features
• • 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
  • F16F9/34—Special valve constructions; Shape or construction of throttling passages
  • F16F9/346—Throttling passages in the form of slots arranged in cylinder walls

Definitions

• the present invention relates to an improved method of manufacturing gas
• gas spring cylinder has an axial, fluid communication channel through which gas (fluid) may be bypassed around or across the gas spring piston assembly and which has a preselected cross-sectional
• gas springs include, among other
• end caps for closing the ends of the tubular cavity, with one of the end caps also including a seal for the reciprocally moveable shaft as it moves with respect to that
• the shaft may be decelerated during the extension
• the gas spring must be in a shaft-down orientation through its extension
• channels or grooves are relatively expensive to provide because their manufacture requires specialized, relatively sophisticated tooling and manufacturing operations
• the gas spring cylinder includes an axial, fluid communication channel that interconnects the two working chambers in the gas
• the present invention is particularly suited for the efficient, relatively inexpensive
• a fluid communication channel is preferably initially made in the cylinder at the time that the cylinder itself is made with the entire length of
• the continuous channel having a uniform or the same, initial cross-sectional area
• the profile of the channel may be accomplished in a variety of ways.
• the profile of the channel may be accomplished in a variety of ways.
• a channel portion is reduced by applying external force or pressure to the outer face
• an intermediate stop that is, a stop before its normal end - of - stroke stop.
• profile area is reduced to approaching zero (that is, exhausted) and so that the portion will be left with a smooth, rounded surface, which corresponds with the rest
• channel portion, immediately preceding the stop may be reduced, relative to the
• Another object of the present invention is to provide an improved, efficient,
• cross-sectional area profile is open to the tubular cavity and extends axially in the
• piston assembly is adjacent to other channel portions that have different cross-
• a related object of the present invention is to provide an improved method, as described, where the fluid communication channel is made as
• sectional area profile of the fluid communication channel is substantially the same
• Another related object of the present invention is to
• sectional area profile of the channel portion includes the step of exerting selective
• Still another related object of the present invention is to provide an
• channel portion is reduced to approaching zero so that gas or fluid is prevented from
• a still further object of the present invention is to provide an improved gas
• Figure 1 is a general perspective view illustrating a method of manufacturing
• Figure 2 is a general perspective view illustrating one type of tooling that
• Figure 3 is an end view of the cylinder being made in Figure 1.
• Figure 4 is a general perspective view illustrating other tooling that may be used to make the fluid communication chaimel of Figure 1.
• Figure 5 is an axial, end cross-sectional view of the cylinder of Figure 1
• Figure 6 is an enlarged view of the portion of the channel taken on line 6 in
• Figure 7 is an axial, cross-sectional view of a gas spring made in accordance
• Figures 8 and 9 illustrate side view and end views, respectively, of tooling that may be used to change the initial cross-sectional area profile of a fluid
• Figure 10 is an enlarged view of the tooling of Figures 8 and 9 taken on line 10 of Figure 9.
• Figure 11 and 12 illustrate side view and end views, respectively, of other
• Figure 13 is an enlarged view of the tooling of Figures 11 and 12, taken on
• Figure 14 is an enlarged view of the portion of the channel taken on line 14
• Figure 15 is an enlarged view of the portion of the channel taken on line 15
• Figure 16 is a side view of the cam wheel tooling that may be used to change the initial cross-sectional area profile of a channel portion in accordance with the
• Figure 17 is an enlarged cross-sectional view taken on line 17-17 in Figure
• Figure 18 illustrates a side view of another cam wheel tooling that may be
• Figure 19 is an enlarged cross-sectional view taken on line 19-19 in Figure 18.
• Figures 20-22 illustrates a way of using the cam wheel tooling of Figure 16
• Figure 1 generally illustrates a conventional method of manufacturing a
• the cylinder 32 is made by a
• the channel 44 may, however, be posited into the inner face of the cylinder
• the channel 44 should have a uniform cross-sectional area profile
• Figure 3 shows (downstream from the tooling 46) a
• the conventional tooling 48 removes or "cuts" metal from the inner face of the cylinder 32 to make the channel 44, and leaves the outer face of the cylinder 32
• Figures 5 and 6 illustrates a channel 44 made by the
• the tooling 48 functions in a manner similar to a
• the tubular cylinder may be any suitable material.
• the tubular cylinder may be any suitable material.
• the tubular cylinder may also be
• the internal mandrill may have a radial projection that may draw or skive the continuous channel 44. While many different types of conventional tooling may be used to make the
• the channel(s) 44 may have a variety of different cross-
• the cylinder is then cut to length and prepared for assembly as part of a gas
• the ends of the cut cylinder may be bored appropriately to exhaust the
• a conventional end cap 58 is welded, in a conventional manner, to the
• a conventional end cap 62 is disposed and
• a conventional O-ring seal 64 and a conventional shaft seal 66 are included as parts of
• a conventional piston assembly 68 is disposed within the cylinder 32. More
• the inner surface of the cylinder and the caps 58 and 62 define an
• the piston assembly 68 divides the
• the piston assembly 68 includes conventional components, including a
• bypass valve 78 a sealing ring 82 and a top plate 84.
• the assembly is axially,
• a shaft 86 is connected with the assembly 68 and projects or extends
• the sealing ring 82 of the piston assembly 68 is permitted to shuttle a certain distance between the valve 78 and the top plate 84.
• channel 44 from chamber 74 to chamber 76 may be achieved by changing, or more
• caps 58 and 62 may be done in a variety of ways and is preferably done before the caps 58 and 62
• the cylinder 32 is placed on an internal cylindrical mandrill, not shown.
• the cylinder 32 is placed on an internal cylindrical mandrill, not shown.
• the change may be accomplished by pressing a
• a tool 92 shown in Figures 8-10
• a tool 94 shown in
• the tool 92 has a generally "N" shaped metal engaging end 96
• the tool 94 has a generally "W” shaped metal engaging end
• the cylinder wall 47, adjacent to the channel portion, is cold formed
• the degree of reduction may be any degree of reduction.
• the tool will cold form the channel portion to a line-to-line condition with the
• Figure 14 shows a channel portion 102 whose profile has been reduced to approaching zero or
• Figure 15 shows a channel portion 104 whose profile has been reduced so as to
• V edged wheels or rollers cam follower bearings, and linear cams which define the degree and location of displacement of the wheels or rollers. This other way
• FIGs 16 and 17 and Figures 18 and 19 show illustrative conventional cam
• the cam wheel 106 includes one cam 112
• cam wheel 108 include a continuous earning surface 114 whose radial
• Figures 20-22 illustrate how
• cam wheel tooling 106 may be used to change the initial cross-sectional area
• the roller cam tooling 108 may be used with a conventional linear cam (not
• sectional area profile of several portions of the fluid communication channel 44 may be
• the initial profile of the fluid communication channel 44 may be changed in preselected portions of its length and in various locations to varying
• the cross-sectional area profile of the channel determines the rate at which
• gas or fluid may bypass around or across the piston assembly 68 as the assembly 68
• portion 102) is reduced to approaching zero, the velocity of the piston assembly and
• channel portion 102 is changed, as shown in Figure 14, so as to become essentially
• portion create a positive and secure hydraulic "lock” .
• Including such a channel portion, like the portion 102, in a gas spring is desirable, for example, where auto
• manufacturer wishes to stop the lifting of the gate or lid at less than its full extended position so that persons, who are relatively short, may easily reach the hatch or lid.
• a shuttle seal ring 82 that is made from a material that may
• piston shuttling sealing ring 82 should provide
• elastomer ic material rubber, TPE, etc.
• the cylinder 32 may include both a rounded portion 102, and
• shuttling seal ring 82 should also be manufactured from a material that will resist
• spring cylinder has been described as having a single fluid communication channel
• more than one such channel could be utilized in a gas spring cylinder.
• the original channel profile might be uniformly or

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Life Sciences & Earth Sciences (AREA)
• Agronomy & Crop Science (AREA)
• Fluid-Damping Devices (AREA)
• Springs (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Publications (1)

Family

ID=22263593

Family Applications (1)

Country Status (6)

Cited By (2)

Families Citing this family (6)

Citations (4)

Family Cites Families (5)

• 1999
  • 1999-08-20 CA CA002341401A patent/CA2341401A1/en not_active Abandoned
  • 1999-08-20 JP JP2000566050A patent/JP2002523686A/ja active Pending
  • 1999-08-20 DE DE19983485T patent/DE19983485T1/de not_active Withdrawn
  • 1999-08-20 GB GB0103897A patent/GB2357821B/en not_active Expired - Fee Related
  • 1999-08-20 WO PCT/US1999/019022 patent/WO2000010742A1/en not_active Ceased
  • 1999-08-20 US US09/744,287 patent/US6425279B1/en not_active Expired - Fee Related

Patent Citations (4)

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