US3879026A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Universal work holders for assembling curved laminated units
Assignee: Individual
•
Filing: 1973-01-22
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Granted: 1975-04-22
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Expires: 1993-01-22
Abstract
Abstract The invention includes a universal work holder or jig for use in making curved supports and railings and the like from a plurality of associated laminas, the supports so made and the method of making the same. In the preferred configuration, each support will be in the form of a helix and its principal use at present is in a so-called flying spiral stairway. Pairs of approximately dimensioned helical supporting units may be used to carry the individual stair treads and other appropriately dimensioned helical units may be used with the stairs as inner and outer handrails carried by balusters mounted on the tread supporting units. The invention however is not limited to the manufacture of elements to be used in spiral stairways.
Inventors
- 👤 Jr James B Lappin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:35
CPC Classifications
B; B25; B25B; B25B5/00; B25B5/14; B27; B27M; B27M3/00; B27M3/12; Y; Y10; Y10S; Y10S269/00; Y10S269/909; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49895; Y10T29/49901
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
201 words
A jig for use in the production of an elongated laminated unit shaped in the form of a continuous non-planar curve, said jig comprising a center post, a plurality of arms mounted on said post in selected spaced axial positions and in selected spaced angular positions, each arm being unconnected at its outer end with the next adjacent arm, and lamina receiving guides mounted on said arms in positions defining a non-planar curve, said guides being in the form of radially spaced elements of which at least one of said elements on each said arm is fixed in said curve defining position prior to the insertion of any of the lamina of said elongated unit into said guides, each of said guide elements having a work engaging surface which extends parallel to the axis of said center Post and is long enough to extend diagonally across said laminas, the lamina receiving opening between said guide elements terminating at said arm to which the elements are affixed, whereby when a lamina is inserted into said guides, the pitch of the lamina is controlled by its engagement with said arms and the diameter is controlled by its engagement with the said guide elements.
Claim 2
Dependent Claim
201 words
A jig for use in the production of an elongated laminated unit shaped in the form of a continuous non-planar curve, said jig comprising a center post, a plurality of arms mounted on said post in selected spaced axial positions and in selected spaced angular positions, each arm being unconnected at its outer end with the next adjacent arm, and lamina receiving guides mounted on said arms in positions defining a non-planar curve, said guides being in the form of radially spaced elements of which at least one of said elements on each said arm is fixed in said curve defining position prior to the insertion of any of the lamina of said elongated unit into said guides, each of said guide elements having a work engaging surface which extends parallel to the axis of said center Post and is long enough to extend diagonally across said laminas, the lamina receiving opening between said guide elements terminating at said arm to which the elements are affixed, whereby when a lamina is inserted into said guides, the pitch of the lamina is controlled by its engagement with said arms and the diameter is controlled by its engagement with the said guide elements.
Claim 3
Dependent Claim
201 words
A jig for use in the production of an elongated laminated unit shaped in the form of a continuous non-planar curve, said jig comprising a center post, a plurality of arms mounted on said post in selected spaced axial positions and in selected spaced angular positions, each arm being unconnected at its outer end with the next adjacent arm, and lamina receiving guides mounted on said arms in positions defining a non-planar curve, said guides being in the form of radially spaced elements of which at least one of said elements on each said arm is fixed in said curve defining position prior to the insertion of any of the lamina of said elongated unit into said guides, each of said guide elements having a work engaging surface which extends parallel to the axis of said center Post and is long enough to extend diagonally across said laminas, the lamina receiving opening between said guide elements terminating at said arm to which the elements are affixed, whereby when a lamina is inserted into said guides, the pitch of the lamina is controlled by its engagement with said arms and the diameter is controlled by its engagement with the said guide elements.
Claim 4
Dependent Claim
201 words
A jig for use in the production of an elongated laminated unit shaped in the form of a continuous non-planar curve, said jig comprising a center post, a plurality of arms mounted on said post in selected spaced axial positions and in selected spaced angular positions, each arm being unconnected at its outer end with the next adjacent arm, and lamina receiving guides mounted on said arms in positions defining a non-planar curve, said guides being in the form of radially spaced elements of which at least one of said elements on each said arm is fixed in said curve defining position prior to the insertion of any of the lamina of said elongated unit into said guides, each of said guide elements having a work engaging surface which extends parallel to the axis of said center Post and is long enough to extend diagonally across said laminas, the lamina receiving opening between said guide elements terminating at said arm to which the elements are affixed, whereby when a lamina is inserted into said guides, the pitch of the lamina is controlled by its engagement with said arms and the diameter is controlled by its engagement with the said guide elements.
Claim 5
Dependent Claim
31 words
The jig set forth in claim 1, said arms being carried by collars which are adjustable axially and angularly on said post and said guides being radially adjustable on said arms.
Claim 6
Dependent Claim
28 words
The jig set forth in claim 2 and a device associated with said post for indicating the angle at which each said arm is secured to said post.
Claim 7
Dependent Claim
30 words
The jig set forth in claim 2, said post being rotatable about its axis and a device associated with said post for indicating the relative angular positions of said arms.
Claim 8
Dependent Claim
64 words
The jig set forth in claim 1, said arms being equally spaced along said post, said arms being equally angularly spaced about said post, and said guides all being equidistant radially from the axis of said post, whereby said guides define the path of a helix and whereby a plurality of lamina placed in said guides will take the form of a helical unit.
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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) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |