Patent US3841609A successfully refreshed from Google Patents.
US3841609A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Perimeter guard rail system
Assignee: Individual
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Filing: 1972-03-17
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Granted: 1974-10-15
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Expires: 1992-03-17
Abstract
Abstract A perimeter guard rail apparatus for rapid installation of a temporary safety barrier provides a clamping system used for clamping a post to a concrete slab with a pair of clamping jaws with at least the upper jaw being set at an acute angle with the post and both jaws having friction pads thereon for engaging a concrete slab. One or both of the jaws are slidably connected to the post and are locked against the concrete slab with a wedge driven into a slot in the post which wedge drives the adjustable jaw against the concrete slab clamping the slab between the jaws. A guard rail holding system is also provided which is attached to the post and has a hook member movably connected to one side of the post for swinging through a slot in the post for engaging a guard rail and holding it against the post. A holding device for toe boards is also provided having a hook for engaging the post and nail holes for attaching toe boards between posts.
Inventors
- 👤 M Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:01
CPC Classifications
E; E04; E04G; E04G21/00; E04G21/32; E04G21/3204; E04G21/3223; E04G21/3233; E04G21/3242
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
212 words
A movable guard rail clamp system, comprising in combination: an elongated post member having two ends and at least one opening therethrough between said ends and means for attaching a rail thereto to form a protective guard rail between pairs of elongated post members when anchored to a concrete slab; clamp means located on said elongated member, said clamp means having a pair of jaws extending from said elongated member, each said jaw having resilient friction gripping surfaces thereon to form the gripping surfaces of said jaws, and at least one said jaw being movably mounted on said elongated member and extending at an acute angle between said elongated member and said gripping surface of said movable jaw; anchoring means for locking said clamp means to a slab with said jaws attached to either side of the slab, said anchoring means including a wedge-shaped member to force said jaws into engagement with a concrete slab to hold said elongated member in position on said slab by driving said wedge shaped member into an opening in said elongated member and against said movable jaw; and said wedge shaped member being movably attached to said clamp means, whereby said elongated member may be rapidly attached to a flat surface between a pair of jaws.
Claim 2
Dependent Claim
212 words
A movable guard rail clamp system, comprising in combination: an elongated post member having two ends and at least one opening therethrough between said ends and means for attaching a rail thereto to form a protective guard rail between pairs of elongated post members when anchored to a concrete slab; clamp means located on said elongated member, said clamp means having a pair of jaws extending from said elongated member, each said jaw having resilient friction gripping surfaces thereon to form the gripping surfaces of said jaws, and at least one said jaw being movably mounted on said elongated member and extending at an acute angle between said elongated member and said gripping surface of said movable jaw; anchoring means for locking said clamp means to a slab with said jaws attached to either side of the slab, said anchoring means including a wedge-shaped member to force said jaws into engagement with a concrete slab to hold said elongated member in position on said slab by driving said wedge shaped member into an opening in said elongated member and against said movable jaw; and said wedge shaped member being movably attached to said clamp means, whereby said elongated member may be rapidly attached to a flat surface between a pair of jaws.
Claim 3
Dependent Claim
23 words
The apparatus in accordance with claim 1 in which said wedge shaped member is connected to said movable jaw by a flexible member.
Claim 4
Dependent Claim
15 words
The apparatus in accordance with claim 2 in which said flexible member is a chain.
Claim 5
Dependent Claim
22 words
The apparatus in accordance with claim 1 in which said movable jaw has an opening therein with said elongated member passing therethrough.
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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) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |