Patent US3920504A successfully refreshed from Google Patents.
US3920504A
Expired / Lapsed
US
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Friction welding apparatus
Assignee: Branson Ultrasonics Corp
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Filing: 1974-10-25
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Granted: 1975-11-18
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Expires: 1994-10-25
Abstract
Abstract A friction welding apparatus for joining workpieces, preferably those of thermoplastic material, comprises a stationary support and a platform adapted to undergo translating reciprocating motion responsive to the force provided by electromagnetic means coacting between the platform and support. The platform is coupled to the support by a set of leaf spring members constructed for yielding in the direction of the translating motion, but for exhibiting rigidity in the direction perpendicular to the direction of said motion. The leaf spring members together with other means cause the workpieces joined to be in predetermined alignment upon cessation of the motion. The platform is constructed to oscillate near or at its condition of resonance when subjected to the force of the electromagnetic means. Fluid responsive means in combination with pin and cam means provide forced engagement between the workpiece supported by the platform and the workpiece retained by the support.
Inventors
- 👤 Andrew Shoh
- 👤 Jr Ernest P Holze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:23
CPC Classifications
B; B29; B29C; B29C65/00; B29C65/02; B29C65/06; B29C65/0609; B29C65/0618; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/13; B29C66/131; B29C66/1312; B29C66/50; B29C66/51; B29C66/54; B29C66/80; B29C66/81; B29C66/816; B29C66/8167; B29C66/82; B29C66/822; B29C66/8221; B29C66/824; B29C66/8242; B29C66/83; B29C66/832; B29C66/8322; Y; Y10; Y10T; Y10T156/00; Y10T156/17; Y10T156/1702; Y10T156/1744
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
159 words
A FRICTION WELDING APPARATUS FOR JOINING WORKPIECES COMPRISING: A SUPPORT FOR HOLDING A FIRST WORKPIECE; A PLATFORM FOR HOLDING A SECOND WORKPIECE TO BE JOINED TO SAID FIRST WORKPIECE; ELECTROMAGNETIC FORCE GENERATING MEANS DISPOSED FOR CAUSING SAID PLATFORM TO UNDERGO RECIPROCATING TRANSLATING MOTION RELATIVE TO SAID SUPPORT ALONG A FIRST AXIS DISPOSED IN A PLANE; MEANS COUPLING SAID PLATFORM TO SAID SUPPORT COMPRISING YIELDABLE MEMBERS DIMENSIONED FOR CAUSING SAID PLATFORM TO BE IN A REST POSITION IS THE ABSENCE OF SAID ELECTROMAGNETIC FORCE AND FOR CAUSING SAID PLATFORM TO UNDERGO SAID RECIPROCATING TRANSLATING MOTION RESPONSIVE TO SAID ELECTROMEGNETIC FORCE WHILE SUBSTANTIALLY INHIBITING MOTION OF SAID PLATFORM ALONG A SECOND AXIS APERPENDICULAR TO SAID PLANE, AND FOR RESTORING SAID PLATFORM TO SAID REST POSITION RESPONSIVE TO THE CESSATION OF SAID ELECTROMAGNETIC FORCE, AND MEANS COUPLED TO SAID SUPPORT FOR PROVIDING AN ENGAGEMENT FORCE BETWEEN THE RESPECTIVE WORKPIECES ON SAID SUPPORT AND SAID PLATFORM IN A DIRECTION ALONG SAID SECOND AXIS.
Claim 2
Dependent Claim
159 words
A FRICTION WELDING APPARATUS FOR JOINING WORKPIECES COMPRISING: A SUPPORT FOR HOLDING A FIRST WORKPIECE; A PLATFORM FOR HOLDING A SECOND WORKPIECE TO BE JOINED TO SAID FIRST WORKPIECE; ELECTROMAGNETIC FORCE GENERATING MEANS DISPOSED FOR CAUSING SAID PLATFORM TO UNDERGO RECIPROCATING TRANSLATING MOTION RELATIVE TO SAID SUPPORT ALONG A FIRST AXIS DISPOSED IN A PLANE; MEANS COUPLING SAID PLATFORM TO SAID SUPPORT COMPRISING YIELDABLE MEMBERS DIMENSIONED FOR CAUSING SAID PLATFORM TO BE IN A REST POSITION IS THE ABSENCE OF SAID ELECTROMAGNETIC FORCE AND FOR CAUSING SAID PLATFORM TO UNDERGO SAID RECIPROCATING TRANSLATING MOTION RESPONSIVE TO SAID ELECTROMEGNETIC FORCE WHILE SUBSTANTIALLY INHIBITING MOTION OF SAID PLATFORM ALONG A SECOND AXIS APERPENDICULAR TO SAID PLANE, AND FOR RESTORING SAID PLATFORM TO SAID REST POSITION RESPONSIVE TO THE CESSATION OF SAID ELECTROMAGNETIC FORCE, AND MEANS COUPLED TO SAID SUPPORT FOR PROVIDING AN ENGAGEMENT FORCE BETWEEN THE RESPECTIVE WORKPIECES ON SAID SUPPORT AND SAID PLATFORM IN A DIRECTION ALONG SAID SECOND AXIS.
Claim 3
Dependent Claim
20 words
A friction welding apparatus as set forth in claim 1, said plane being parallel to the surface of said platform.
Claim 4
Dependent Claim
31 words
A friction welding apparatus as set forth in claim 1, said workpieces having respective surfaces along which said workpieces are to be joined and said plane being parallel to said surfaces.
Claim 5
Dependent Claim
49 words
A friction welding apparatus as set forth in claim 1, said support including a movable plate for holding said first workpiece, and said means providing an engagement force causing said plate to be urged toward said platform and retained substantially stationary along said first axis relative to said platform.
Claim 6
Dependent Claim
33 words
A friction welding apparatus as set forth in claim 4, said means providing an engagement force comprising fluid pressure means acting upon movable cam means disposed for engaging pins located on said plate.
Claim 7
Dependent Claim
45 words
A friction welding apparatus as set forth in claim 5, said cam means including a cam surface dimensioned to cause the length of said cam surface to exceed the length of said cam surface travel along said pin when the workpieces are in forced engagement.
Claim 8
Dependent Claim
34 words
A friction welding apparatus as set forth in claim 1, said platform being dimensioned to be substantially resonant at the frequecy of said electromagnetic force when said second workpiece is disposed in said platform.
Claim 9
Dependent Claim
31 words
A friction welding apparatus as set forth in claim 1, said means coupling said platform to said support comprising a pair of spring members coupled to opposite sides of said platform.
Claim 10
Dependent Claim
38 words
A friction welding apparatus as set forth in claim 8, said pair of spring members comprising leaf springs, each of said springs being secured with one end to said platform and with the other end to said support.
Claim 11
Dependent Claim
41 words
A friction welding apparatus as set forth in claim 8, said pair of spring members comprising a set of leaf springs, each of said springs being secured at each end to said support and secured at its center to said platform.
Claim 12
Dependent Claim
41 words
A friction welding apparatus as set forth in claim 8, said pair of spring members comprising a set of leaf springs, each of said springs being secured along one edge to said platform, and along the opposite edge to said support.
Claim 13
Dependent Claim
30 words
A friction welding apparatus as set forth in claim 1, and stop menas disposed for providing a stop to limit the displacement of the said platform while undergoing said motion.
Claim 14
Dependent Claim
45 words
A friction welding apparatus as set forth in claim 1, said electromagnetic force generating means comprising a pair of electric coils disposed about magnetic cores, and said coils being connected to provide cyclically respective magnetic forces 180 degrees phase shifted with respect to each other.
Claim 15
Dependent Claim
28 words
A friction welding apparatus as set forth in claim 13, said magnetic forces being at a frequency which is a multiple of the frequency of the applied signal.
Claim 16
Dependent Claim
19 words
A friction welding apparatus as set forth in claim 13, said core being a laminated stack of magnetic material.
Claim 17
Dependent Claim
32 words
A friction welding apparatus as set forth in claim 13, said electromagnEtic force generating means including means for converting a three-phase alternating current input signal to a two-phase alternating current output signal.
Claim 18
Dependent Claim
44 words
A friction welding apparatus as set forth in claim 1, said electromagnetic force generating means comprising magnetic coil means disposed on said support and magnetic core means secured to said platform, and means for causing said coil means to be energized with alternating current.
Claim 19
Dependent Claim
53 words
A friction welding apparatus as set forth in claim 1, and including pressure responsive control means coupled to said means for providing said engagement force and connected to said electromagnetic force generating means for inhibiting operation of said electromagnetic force generating means until said engagement force between said workpieces is of predetermined value.
Claim 20
Dependent Claim
34 words
A friction welding apparatus as set forth in claim 18, said pressure responsive control means including a mechanical force responsive means and an electrical switch disposed for actuation by said mechanical force responsive means.
Claim 21
Dependent Claim
188 words
A friction welding apparatus for joining workpieces along a mating surface comprising: a support for holding a first workpiece; a platform for holding a second workpiece to be joined to said first workpiece; electromagnetic force generating means disposed for causing said platform to undergo reciprocating translating motion relative to said support along a first axis disposed in a plane; means coupling said platform to said support comprising yieldable members dimensioned for causing said platform to be in a rest position in the absence of said electomagnetic force and for enabling said platform to undergo said reciprocating translating motion responsive to said electromagnetic force while substantially inhibiting motion of said platform along a second axis perpendicular to said plane, and for restoring said platform to said rest position responsive to the cessation of said electromagnetic force; means coupled for moving said support towards said platform along said second axis to cause respective workpieces on said support and said platform to be urged into intimate contact along their mating surfaces, and alignment means coupled for positioning said support relative to said platform in the direction of said reciprocating translating motion.
Claim 22
Dependent Claim
188 words
A friction welding apparatus for joining workpieces along a mating surface comprising: a support for holding a first workpiece; a platform for holding a second workpiece to be joined to said first workpiece; electromagnetic force generating means disposed for causing said platform to undergo reciprocating translating motion relative to said support along a first axis disposed in a plane; means coupling said platform to said support comprising yieldable members dimensioned for causing said platform to be in a rest position in the absence of said electomagnetic force and for enabling said platform to undergo said reciprocating translating motion responsive to said electromagnetic force while substantially inhibiting motion of said platform along a second axis perpendicular to said plane, and for restoring said platform to said rest position responsive to the cessation of said electromagnetic force; means coupled for moving said support towards said platform along said second axis to cause respective workpieces on said support and said platform to be urged into intimate contact along their mating surfaces, and alignment means coupled for positioning said support relative to said platform in the direction of said reciprocating translating motion.
Claim 23
Dependent Claim
37 words
A friction welding apparatus as set forth in claim 20, said alignment means comprising a fluid actuated means effective to cause the first workpiece to be adjustably positioned and retained in the direction of said translating motion.
Claim 24
Dependent Claim
17 words
A friction welding apparatus as set forth in claim 21, said alignment means including adjustable spacer means.
Claim 25
Dependent Claim
157 words
A friction welding apparatus for joining workpieces comprising: a support for holding a first workpiece; a platform for holding a second workpiece to be joined to said first workpiece; electromagnetic force generating means disposed for causing said platform to undergo reciprocating translating motion relative to said support in the first plane; means coupling said platform to support comprising yieldable members dimensioned for causing said platform to be in a rest position in the absence of said electromagnetic force and for causing said platform to undergo said reciprocating translating motion responsive to said electromagnetic force while substantially inhibiting motion of said platform in a second plane perpendicular to said first plane, and for restoring said platform to said rest position responsive to the cessation of said electromagnetic force, and means coupled to said support for providing an engagement force between the respective workpieces on said support and said platform in a direction substantially perpendicular to said first plane.
Claim 26
Dependent Claim
157 words
A friction welding apparatus for joining workpieces comprising: a support for holding a first workpiece; a platform for holding a second workpiece to be joined to said first workpiece; electromagnetic force generating means disposed for causing said platform to undergo reciprocating translating motion relative to said support in the first plane; means coupling said platform to support comprising yieldable members dimensioned for causing said platform to be in a rest position in the absence of said electromagnetic force and for causing said platform to undergo said reciprocating translating motion responsive to said electromagnetic force while substantially inhibiting motion of said platform in a second plane perpendicular to said first plane, and for restoring said platform to said rest position responsive to the cessation of said electromagnetic force, and means coupled to said support for providing an engagement force between the respective workpieces on said support and said platform in a direction substantially perpendicular to said first plane.
Claim 27
Dependent Claim
29 words
A friction welding apparatus as set forth in claim 23, and additional means coupled for causing said first workpiece to be biased in indexed position in said first plane.
Claim 28
Dependent Claim
43 words
A friction welding apparatus as set forth in claim 23, said support including a movable plate having means for holding said first workpiece, said means coupled for providing said engagement force acting upon said plate for providing said force between said respective workpieces.
Claim 29
Dependent Claim
54 words
A friction welding apparatus as set forth in claim 25, said means for providing said engagement force including fluid pressure means in combination with movable cam means and pins disposed respectively on said support and plate, said plate being urged toward said platform responsive to said cam means engaging said pins and moving thereover.
References Cited (Backward Citations)
US3554845A
Cited
US3750927A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |