Patent US3620558A successfully refreshed from Google Patents.
US3620558A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Joint locking apparatus
Assignee: Individual
•
Filing: 1969-06-23
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Granted: 1971-11-16
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Expires: 1989-06-23
Abstract
Abstract A joint locking device for use in the construction of knockdown furniture, display cases, and the like, where a structure is to be readily assembled to a predetermined configuration and then readily collapsed for transportation or reassembly. One member of a structural frame has a locking insert for insertion into a second member of the frame whereby the two members may be locked together in a rigid manner. The locking insert has a base member with a guide groove therein and a pair of sliding locking members having slide bars for sliding in the guides in the base. The locking members may be forced apart for gripping the internal walls of the second frame member, thereby locking the two frame members together. The sliding lock members are forced apart by a setscrew with access to the setscrew provided by a small aperture in the side of the frame member.
Inventors
- 👤 Daniel G Macmillan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:19
CPC Classifications
F; F16; F16B; F16B7/00; F16B7/04; F16B7/044; F16B7/0446; Y; Y10; Y10T; Y10T403/00; Y10T403/53; Y10T403/535; Y10T403/55; Y10T403/557; Y10T403/70; Y10T403/7041
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
191 words
A joint locking apparatus for connecting a plurality of frame or structure members together comprising in combination: a. at least one first frame member being elongated and having at least one open end; b. at least one second frame member having locking insert means forming a part thereof; c. each said first frame member being adapted to receive at least one said locking insert means of at least one second frame member in one said open end of said first frame member; d. said locking insert means having a base member and locking members slidably attached to one end of said base member; each said locking member being slidably connected to the end of said base member by a guide and guide bar means whereby a guide bar slides in a guide groove, said guide and guide bar means connecting said locking members to said base for transverse sliding of each said locking member relative to said elongated first frame member; and e. means to slide each said locking member transversely into engagement with the internal walls of said first frame member thereby connecting said first and second frame members together.
Claim 2
Dependent Claim
191 words
A joint locking apparatus for connecting a plurality of frame or structure members together comprising in combination: a. at least one first frame member being elongated and having at least one open end; b. at least one second frame member having locking insert means forming a part thereof; c. each said first frame member being adapted to receive at least one said locking insert means of at least one second frame member in one said open end of said first frame member; d. said locking insert means having a base member and locking members slidably attached to one end of said base member; each said locking member being slidably connected to the end of said base member by a guide and guide bar means whereby a guide bar slides in a guide groove, said guide and guide bar means connecting said locking members to said base for transverse sliding of each said locking member relative to said elongated first frame member; and e. means to slide each said locking member transversely into engagement with the internal walls of said first frame member thereby connecting said first and second frame members together.
Claim 3
Dependent Claim
39 words
The apparatus according to claim 1 in which said means to slide said locking members apart includes a screw threaded through one said locking member and adapted to apply a force to the other said locking member when tightened.
Claim 4
Dependent Claim
30 words
The apparatus according to claim 2 in which each said second frame member has at least one aperture therein for access to said screw threaded through said one locking member.
Claim 5
Dependent Claim
32 words
The apparatus according to claim 3 in which each said locking member has gripping surfaces for gripping the internal walls of each first frame member being joined to a second frame member.
Claim 6
Dependent Claim
30 words
The apparatus according to claim 4 in which said locking insert means base member has said guide groove therein and said guide bars are located on each said locking member.
Claim 7
Dependent Claim
35 words
The apparatus according to claim 5 in which said guide means of said base member has stop means on each end thereof to maintain said guide bars of said locking members in said guide groove.
Claim 8
Dependent Claim
28 words
The apparatus according to claim 6 in which said guide groove has resilient means therein adapted to force said guide bars toward each other in said guide means.
Claim 9
Dependent Claim
22 words
The apparatus according to claim 7 in which each said locking member is substantially triangular is cross sectioned with a flattened apex.
Claim 10
Dependent Claim
16 words
The apparatus according to claim 7 in which each said locking member is substantially semicylindrically shaped.
Claim 11
Dependent Claim
15 words
The apparatus according to claim 7 in which each said guide groove is bulb shaped.
Claim 12
Dependent Claim
21 words
The apparatus according to claim 10 in which said guide bars are bulb-shaped protusions for sliding in said bulb-shaped guide groove.
Claim 13
Dependent Claim
16 words
The apparatus according to claim 11 in which said second frame member is a hollow tube.
Claim 14
Dependent Claim
17 words
The apparatus according to claim 12 in which said hollow tube is substantially square in cross sections.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |