US4509577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chain gate structure
Assignee: PRIEFERT Manufacturing Co Inc RR A TX CORP
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Filing: 1983-11-07
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Granted: 1985-04-09
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Expires: 2003-11-07
Abstract
Abstract The chain gate has a pair of reversely inclined end posts which extend upwardly in a diverging relation and movably support the ends of a plurality of chain members extended therebetween. When the chain gate is in a gateway closing position the chain members are in a vertically spaced relation and in a gateway opening position the chain members form a mass on the ground surface between the end posts. The adjacent ends of the chain members are interconnected by a flexible actuating member so that on closing upward movement of the chain members from lowered ground positions the opposite ends of each chain member are concurrently moved upwardly so as to sequentially move the chain members to their horizontally extended vertically spaced relation defining the gate closing position. The chain members vary in length relative to the reversed inclination of the end posts so as to be drawn taut between the end posts in the gate closing position. The chain gate may be opened or closed either mechanically or manually.
Inventors
- 👤 Marvin J. Priefert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:13
CPC Classifications
E; E06; E06B; E06B11/00; E06B11/02; E06B11/021
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
236 words
A chain gate for a gateway defined by a pair of upright horizontally spaced anchor members comprising: (a) a chain structure for opening and closing said gateway including a pair of end posts corresponding to said pair of anchor members with each end post located adjacent to and inwardly of an associated anchor member and inclined upwardly and toward the anchor member, (b) means for securing each end post to an adjacent anchor member, (c) a plurality of chain members extended between said end posts in a vertically spaced relation to raised positions therefor to close said gateway with the uppermost one of said chain members adjacent the upper ends of said end posts, and to lowered positions extended between the lower ends of said end posts to open said gateway, (d) means connecting the ends of said chain members to said end posts for up and down movement thereon, (e) flexible means interconnecting adjacent ends of said chain members whereby on movement of the uppermost one of said chain members from the gate opening to the gate closing position therefor the remaining chain members are sequentially moved thereby to the gateway closing positions therefor, said chain members having varying lengths relative to the inclination of said end posts to provide for their taut extension between the end posts in the gate closing positions therefor, and (f) means for raising and lowering said uppermost chain member.
Claim 2
Dependent Claim
236 words
A chain gate for a gateway defined by a pair of upright horizontally spaced anchor members comprising: (a) a chain structure for opening and closing said gateway including a pair of end posts corresponding to said pair of anchor members with each end post located adjacent to and inwardly of an associated anchor member and inclined upwardly and toward the anchor member, (b) means for securing each end post to an adjacent anchor member, (c) a plurality of chain members extended between said end posts in a vertically spaced relation to raised positions therefor to close said gateway with the uppermost one of said chain members adjacent the upper ends of said end posts, and to lowered positions extended between the lower ends of said end posts to open said gateway, (d) means connecting the ends of said chain members to said end posts for up and down movement thereon, (e) flexible means interconnecting adjacent ends of said chain members whereby on movement of the uppermost one of said chain members from the gate opening to the gate closing position therefor the remaining chain members are sequentially moved thereby to the gateway closing positions therefor, said chain members having varying lengths relative to the inclination of said end posts to provide for their taut extension between the end posts in the gate closing positions therefor, and (f) means for raising and lowering said uppermost chain member.
Claim 3
Dependent Claim
43 words
A chain gate according to claim 1, wherein: (a) said connecting means are ring members attached to the ends of each chain member to loosely receive an associated end post therethrough, and (b) means for connecting said flexible means to said ring members.
Claim 4
Dependent Claim
122 words
A chain gate for a gateway according to claim 1, wherein: (a) said raising and lowering means includes a pulley unit movably mounted on each end post for up and down movement thereon, (b) a flexible cable means having one end attached adjacent the lower end of a first one of said end posts and trained about the pulley unit on said first end post and extendible across said gateway and trained about the pulley unit on the second one of said end posts for attachment of the other end thereof adjacent the upper end of the second end post, and (c) a lift mechanism arranged adjacent said one end post member having a lift arm connected to the pulley unit thereon.
Claim 5
Dependent Claim
43 words
A chain gate for a gateway according to claim 3, wherein: (a) said lift mechanism includes a power unit for operating said lift arm, and (b) means for actuating said power unit including a control unit arranged to each side of said gateway.
Claim 6
Dependent Claim
61 words
A chain gate for a gateway according to claim 4, wherein: (a) each control unit is arranged beneath the ground surface and includes an actuating member projected upwardly from said surface for engagement by the wheel of a vehicle, whereby to actuate said power unit in response to a vehicle traveling through said gateway to sequentially open and close said gateway.
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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) | 1988-04-08 | 1988-10-08 | 1989-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-08 | 1992-10-08 | 1993-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-08 | 1996-10-08 | 1997-04-09 | $7700.00 | Window Closed / Lapsed |