Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
  • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
  • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
  • B25B27/0028—Tools for removing or installing seals
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
  • B23P19/00—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
  • B23P19/04—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes for assembling or disassembling parts
  • B23P19/08—Machines for placing washers, circlips, or the like on bolts or other members
  • B23P19/084—Machines for placing washers, circlips, or the like on bolts or other members for placing resilient or flexible rings, e.g. O-rings, circlips

Definitions

• the subject of the present invention is a method and a device for placing an O-ring in the groove of a part or part of a part of revolution.
• O-ring packings commonly called O-rings or O-ring seals
• O-rings have been placed in their grooves manually or mechanically using a tool.
• the present invention aims to set up an O-ring in a groove, in particular a very small O-ring in the groove of a piston, without using any tool or other solid member to enlarge and push the seal. toric.
• the method according to the invention is characterized in that the O-ring is threaded on an auxiliary cylindrical rod of diameter substantially equal to that of the O-ring, that the end of the part of revolution is applied coa ⁇ ially against the end of said rod and that the O-ring of the rod is passed over the part of revolution by means of compressed air.
• the device according to the invention is characterized in that it comprises a source of compressed air, a cylinder connected to this source of compressed air and containing a piston secured to a rod with a diameter at least approximately equal to the internal diameter of the O-ring and projecting from the cylinder body and a spring working in compression between the bottom of the cylinder and the piston.
• the piston and its rod having grooves
• the end of the cylinder body surrounding the piston rod having a cylindrical recess coaxial with the rod and of a diameter such that it allows the compressed O-ring to pass between the part of revolution and the wall of the recess, the stroke of the piston being such that when the resort is completely compressed, the end of the piston rod is located in the recess and exceeds the bottom of this recess by a length equal to the diameter of the section of the O-ring.
• the compressed air sent into the grooves of the latter has the effect of pushing the O-ring seal first radially. which forces it to extend, then axially until it relaxes in the groove of the part of revolution.
• the means for extending the O-ring and pushing it into its groove is therefore only constituted by compressed air. The latter does not risk damaging the O-ring.
• the method according to the invention can be used both for large O-rings and for very small O-rings.
• FIG. 1 is a schematic view of a device for placing an O-ring on a piston, FIG. 1a being a front view of the cylinder 1.
• FIGS 2 to 5 are sectional views of the essential part of the device of Figure 1 in successive operating positions.
• Figure 6 is a partial view, in section, of a first alternative embodiment of the device according to Figures 1 to 5 for the establishment of an O-ring in a groove located at a certain distance from the end d 'an axe.
• Figure 7 is a partial view, in section, of a second alternative embodiment of the device for the establishment of an O-ring on a piston located at a certain distance from the end of an axis.
• the device as shown at rest in Figures 1 and 2, comprises a cylinder 1 in which is mounted a piston 2 provided with a rod 3 and held in abutment against one end of the cylinder 1 by a spring 4 working in compression between the piston 2 and a plug 5 screwed to the end of the cylinder 1.
• This plug 5 is pierced with an axial hole 6 and it is connected by a duct 7 to a source of compressed air 8 provided with a suitable valve.
• the piston 2 and the rod 3 have four longitudinal grooves 9. 10, 11 and 12 ( Figures la and 2) extending over the entire length of the piston and its rod.
• the end of the body of the cylinder 1 located on the side of the rod 3 has a cylindrical recess 13.
• the rod 3 At rest, the rod 3 exceeds this end of the body of the cylinder 1.
• the length of the piston 2 and its rod 3 are such that when the spring 4 is completely compressed (FIG. 3), the rod 3 projects beyond the bottom of the recess 13 by a length equal to the diameter of the section of the O-ring 14 which must be placed in place.
• the diameter of the recess 13 it is determined on the one hand by the section of the O-ring 14 and on the other hand by the diameter of the part of revolution 15 in the groove 16 from which the O-ring 14 must be put in place .
• the diameter of the recess 13 must in all cases be less than the diameter of the part of revolution 15 increased by twice the diameter of the section of the O-ring 14, so that the O-ring is compressed between the part of revolution 15 and the wall of the recess 13.
• the diameter of the recess 13 is preferably equal to the diameter of the part 15 increased from 1.4 to 1.8 times the diameter of the section of the O-ring.
• the O-ring 14 is first of all threaded by hand onto the end of the rod 3 ( Figure 2).
• the internal diameter of the O-ring 14 being equal to the diameter of the rod 3, this installation is done very easily. It is obvious that this equality of diameters should only be very approximate.
• the piece of revolution 15 is then brought coaxially, by means of an automatic mechanism, against the end of the rod 3 and with sufficient pressure to push back the rod 3 and completely compress the spring 4.
• the end of the rod 3 is located inside the recess 13 and exceeds the bottom of this recess by a length equal to or slightly less than the diameter of the section of the O-ring 14. This O-ring is therefore caught between the bottom of the recess 13 and the end of part 15.
• the depth of the recess 13 is a function of the length of the shoulder 17.
• This shoulder can be relatively long in the case of a groove formed on a rod or an axis.
• An example is shown in FIG. 6.
• the part 17 ′ separating the end of the part 15 from the groove 16 is relatively long. Consequently, the depth of the hollow 13 '. corresponding to the recess 13, is also relatively large.
• the device shown in Figure 6 is identical to that shown in Figures 2 to 5.
• Figure 6 shows the device in its compressed position, as in Figure 3. Under the effect of compressed air. the O-ring 14 is driven between the part 17 "and the wall of the cylindrical recess 13 'to finally come to relax in the groove 16.
• FIG. 7 illustrates the positioning of a tori ⁇ that 14 in a groove 18 formed between two spans 19 and 20 of an axis 21.
• the internal diameter of the groove is therefore equal to the diameter of the shaft 21.
• the groove 18 is located at a certain distance from the end of the shaft 21.
• the chamber 13 "', corresponding to the chamber 13" of Figure 6, is therefore also deep.
• This recess 13 "' opens into a second part 22 whose diameter is equal to the diameter of the recess 13' 'increased by the difference between the diameter of the bearing surface 19 and the diameter of the shaft 21.
• the space between the shaft 21 and the wall of the chamber 13 "' is less than the diameter of the section of the O-ring 14, for example equal to the diameter of the shaft 21 increased from 1.4 to 1.8 times the diameter of the section of the O-ring.
• Figure 7 shows the device in its compressed position, like Figure 3. Under the effect of compressed air, the O-ring 14 first extends to the diameter of the recess 13 '' and it is driven between the shaft 21 and the wall of the recess 13 '"until it comes up against the bearing surface 19 in the recess 22. It can then extend further to pass over the bearing surface 19 and come to relax partially in the throat 18.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Automatic Assembly (AREA)
• Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
• Actuator (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=4254231

Family Applications (1)

Country Status (4)

Families Citing this family (7)

Family Cites Families (3)

• 1990
  • 1990-10-22 CH CH335790A patent/CH684391A5/fr not_active IP Right Cessation
• 1991
  • 1991-10-22 EP EP19910919346 patent/EP0506932A1/de not_active Withdrawn
  • 1991-10-22 JP JP51634191A patent/JPH05504514A/ja active Pending
  • 1991-10-22 WO PCT/CH1991/000217 patent/WO1992006816A1/fr not_active Application Discontinuation

Non-Patent Citations (1)

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