US3680897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Force-fitted pin- and tube joint and a frame for an apparatus provided with such a joint
Assignee: Van der Grinten NV
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Filing: 1970-06-29
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Granted: 1972-08-01
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Expires: 1990-06-29
Abstract
Abstract A joint serving, for instance, for joining together frame members of a photocopying apparatus is provided by means of a tube that is substantially circular in cross-section which is force-fitted upon a pin protruding from a structural member such as a frame plate, the pin being tapered to an end portion sufficiently small to enter an end of the tube and having radially retracted outer surface portions alternating with radially protruding conically shaped surface portions so that the tube end when forced upon the pin is elastically deformed and clamped to the contour of the protruding surface portions. Two opposite frame plates of an apparatus may be rigidly connected together by forcing such pins protruding on the frame plates into the opposite ends of a girder tube extending between the plates.
Inventors
- 👤 Theodoor Hillebrand Linthout
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:23
CPC Classifications
F; F16; F16L; F16L41/00; F16L41/08; F16B; F16B9/00; F16B9/09; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49945; Y10T403/00; Y10T403/33; Y10T403/49; Y10T403/4966
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
201 words
A joint comprising a rigid pin protruding from a supporting member and a substantially rigid tube of hard resilient material having an end portion thereof initially of substantially circular cross-section force-fitted axially onto said pin, the periphery of said pin comprising a plurality of surface portions spaced apart circumferentially and retracted radially inwardly to a distance from the center line of said pin substantially smaller than the initial inside radius of said end portion and a plurality of circumferentially convex surface portions respectively lying between said retracted surface portions and tapering in axial direction from a radius adjacent to the base of said pin substantially greater than said initial inside radius to a radius at the free end of said pin not greater than said initial inside radius, said convex surface portions having adjacent to the free end of said pin beveled portions tapering at an increased inclination relative to said center line to a radius thereof at said free end smaller than said initial inside radius, said force-fitted end portion being deformed elastically outwardly in regions thereof upon said convex surface portions and inwardly in regions thereof over said retracted surface portions and thereby being clamped immovably upon said pin.
Claim 2
Dependent Claim
201 words
A joint comprising a rigid pin protruding from a supporting member and a substantially rigid tube of hard resilient material having an end portion thereof initially of substantially circular cross-section force-fitted axially onto said pin, the periphery of said pin comprising a plurality of surface portions spaced apart circumferentially and retracted radially inwardly to a distance from the center line of said pin substantially smaller than the initial inside radius of said end portion and a plurality of circumferentially convex surface portions respectively lying between said retracted surface portions and tapering in axial direction from a radius adjacent to the base of said pin substantially greater than said initial inside radius to a radius at the free end of said pin not greater than said initial inside radius, said convex surface portions having adjacent to the free end of said pin beveled portions tapering at an increased inclination relative to said center line to a radius thereof at said free end smaller than said initial inside radius, said force-fitted end portion being deformed elastically outwardly in regions thereof upon said convex surface portions and inwardly in regions thereof over said retracted surface portions and thereby being clamped immovably upon said pin.
Claim 3
Dependent Claim
29 words
A joint according to claim 1, said retracted surface portions being substantially flat and said convex surface portions constituting circumferentially spaced segments of a common frustum of a cone.
Claim 4
Dependent Claim
28 words
A joint according to claim 1, the generating lines of said convex surface portions being inclined at an angle of less than 4* relative to said center line.
Claim 5
Dependent Claim
46 words
A joint according to claim 1, the generating lines of said convex surface portions extending to said beveled portions at an angle of less than 4* relative to said center line and being inclined at an angle of about 10*-12* relative thereto in said beveled portions.
Claim 6
Dependent Claim
32 words
A joint according to claim 1, the perimeter of said pin adjacent to the base thereof being approximately 4 to 5 percent greater than the initial inner circumference of said end portion.
Claim 7
Dependent Claim
57 words
A supporting frame for apparatus, comprising oppositely disposed frame plates joined together by a substantially rigid connecting tube extending between the plates, wherein each said plate is fixed to said tube by a joint according to claim 1 the rigid pin of which protrudes from the frame plate and the tube of which is said connecting tube.
Claim 8
Dependent Claim
221 words
A joint comprising a rigid pin protruding from a supporting member and a cylindrIcal seamless steel tube having an end portion thereof force-fitted axially onto said pin, the periphery of said pin comprising three substantially flat surface portions spaced apart about the center line of said pin and retracted radially inwardly to a distance from said center line substantially smaller than the inside radius of said tube and three narrower, circumferentially convex surface portions respectively lying between said flat surface portions and constituting segments of a common fructum of a cone, the perimeter of said pin adjacent to the base thereof being approximately 4 to 5 percent greater than the inner circumference of said tube, said convex surface portions having adjacent to the free end of said pin beveled portions the generating lines of which taper at an angle of about 10* - 12* relative to said center line to a radius thereof at said free end smaller than said inside radius, the generating lines of said convex surface portions extending to said beveled portions at an angle of less than 4* relative to said center line, said force-fitted end portion being deformed elastically outwardly in regions thereof upon said convex surface portions and inwardly in regions thereof over said flat surface portions and thereby being clamped immovably upon said pin.
Claim 9
Dependent Claim
221 words
A joint comprising a rigid pin protruding from a supporting member and a cylindrIcal seamless steel tube having an end portion thereof force-fitted axially onto said pin, the periphery of said pin comprising three substantially flat surface portions spaced apart about the center line of said pin and retracted radially inwardly to a distance from said center line substantially smaller than the inside radius of said tube and three narrower, circumferentially convex surface portions respectively lying between said flat surface portions and constituting segments of a common fructum of a cone, the perimeter of said pin adjacent to the base thereof being approximately 4 to 5 percent greater than the inner circumference of said tube, said convex surface portions having adjacent to the free end of said pin beveled portions the generating lines of which taper at an angle of about 10* - 12* relative to said center line to a radius thereof at said free end smaller than said inside radius, the generating lines of said convex surface portions extending to said beveled portions at an angle of less than 4* relative to said center line, said force-fitted end portion being deformed elastically outwardly in regions thereof upon said convex surface portions and inwardly in regions thereof over said flat surface portions and thereby being clamped immovably upon said pin.
Claim 10
Dependent Claim
57 words
A supporting frame for apparatus, comprising oppositely disposed frame plates joined together by a cylindrical seamless steel tube extending between the plates, wherein each said plate is fixed to said tube by a joint according to claim 7 the rigid pin of which protrudes from the frame plate and the tube of which is said steel tube.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |