|Publication number||US2448716 A|
|Publication date||Sep 7, 1948|
|Filing date||Dec 9, 1944|
|Priority date||Dec 9, 1944|
|Publication number||US 2448716 A, US 2448716A, US-A-2448716, US2448716 A, US2448716A|
|Inventors||Hurd George K|
|Original Assignee||Hurd George K|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (7), Referenced by (12), Classifications (8)|
|External Links: USPTO, USPTO Assignment, Espacenet|
Sept. 7, 1948. G. K. HURD 2,448,716
'HOOK ATTACHMENT FOR LADDERS Filed Dec. 9, 1944 Irfl/en for. George K. Hurd.
Patented ept "7, 194$ UNITED STATES PATENTI OFFICE T v T 2,448,716
noox ATTACHMENT on LADDERS George K. Hurd, Torontopont ari m. Canada. l Application December 9, 1944, s rial No. 567,377 g 1 c v i The principal object of this-invention is to provide a device for attachment to ladders which will enable them to be securely anchored at the top on a roof, parapet, window sill or other portion of a building where firemen or workmen are required to operate, and to provide a strong device which may be very easily and quickly attached to or detached from any ladder so that it will be rendered safe.
The principal feature of the invention consists in the novel construction of a rigid frame adapted to fit between the side bars of a ladder to which are integrally secured a pair of rigid bar hooks which embrace a ladder rung and extend upwardly and outwardly therefrom to overreach the ridge of a roof or other projection to securely engage the same, the central member supporting the hooks having adjustable means for securely engaging the ladder rung adjacent to the rung engaging the hook member.
In the accompanying drawings, Figure 1 is a side elevational view of a ladder provided with my improved hook attachment shown in operating position with the hooks extending over the ridge of a building.
Figure 2 is an enlarged front elevational view of my improved attachment.
Figure 3 is a side elevational view of the attachment shown in Figure 2. Figure 4 shows a modification.
Roof ladders as used by firemen in the prosecution of their duties are ordinarily provided with hook extensions rigidly secured to the side rails of the ladder, so that the ladder may be hooked over the eave or a ledge or any projection on a building to hold securely by the en- 3 claims. (01. 222 51) agement of the point of the hook with the enformed of round steel bar stock of suitable dimensions to securely support the long ladder and curved with a suflicient radius to reach well over an eave or roof ridge or a parapet, the end B of said hooks being pointed to enable them to effect a secure grip on any surface.
The other end of these hook members are curved inwardly and upwardly with a short curved hook C which is sufficiently large to embrace the rung D of a ladder.
The hooks A are spaced apart a distance sufilcient to permit them being placed between the side rails E of a'ladder and they are rigidly secured in panallelsrelation to each other by welding or brazing to the shortspaced side portions F of a triangular loop G. also formed of round steel bar. stock; The books C project toward the largehooks A and away from the frame G.
i The frame G is made ofya single length of steel rod: witha cross portion extending between the straight parallel portion-s F and from the straight portions of the bars angle inwardly to meet each other centrally of their width, one end H thereof meeting an obtuse angled bend I in the other portion and being securely brazed or welded thereto. The central extension J of this triangular frame is threaded with a heavy standard thread upon which is threaded a wing nut K.
Slidably mounted on this threaded portion J of the frame is a sleeve L which is formed with a lateral hook extension M which is adapted to extend over the ladder rung N next below the rung D. This hooked member is clamped tightly against the rung N by means of the wing nut K and pushing upwardly against the Y frame it holds the hooks C firmly in position against the under side of the upper rung D.
It will be readily appreciated that this device may be very quickly attached to or detached from a ladder. It is merely necessary to loosen the wing nut K and adjust the sleeve on the threaded stem J of the frame so that the hook M will clear the rung N permitting the device to be simply lifted off the ladder; the device may be simply replaced on any ladder by placing the hooks C to engage the desired rung, then by sliding the sleeve L on the threaded stem of the frame until it engages the next succeeding rung of the ladder and then turning the wing nut down to engage this sleeve and tightening it in place; the device is firmly secured in position, so that it becomes a rigid part of the ladder and will withstand any kind of rough usage and cannot become accidentally misplaced or forcibly torn off.
A device such as described is of very simple but efiective construction and its use will enable ladders to be usd in almost any conceivable position with remark-able safety.
It will be appreciated that a device as described may be instantly fitted on any ladder irrespective of the spacing of the rungs.
In the modified structure illustrated in Figure 4 the threading of the frame extension J may be dispensed with and said extension provided with a flange :i at the top and a coil compression The device-can be, readily remove'dbypushingi. down on-the hooks Ate-disengage hooks-01mm the rung D.
What I claim as my invention is: a
1. A hook attachment for ladders con pgising a pair of curved roof engaging hook's formed of bar stock extending downwardlyto overli'e theupper rung on the outward side andcumed 1112 wardly and upwardly to embrace 'the'adiacent rung, a bar steel frame formed of a rig-id trlangular loop having agicentral stem extending rigidly from one. corner; and having thehother core. ners bent into 'gstlfillghtifil parallel. 5 relation and welded to said ;hooks .and .-:supp0rting= them .-;in parallel relation, and .a. rung zhookzaadiustably mounted on the centralvstem of said frame...
2. A hookeattachment; forcladders, comprising a pair oficur-ved-roof engaging hooks having short upturned rung .gengaging shocks, a irigid. eframe:
4 formed of a single length of bar stock bent into a closed Y-shaped frame having the outer sides rigidly secured to the aforesaid hooks and having the lower central stem portion threaded, a nut threaded on said stem, and a hook formed with a sleeve slidably mounted on said threaded stem.
3. A device as claimed in claim 2 having a coiled compression spring engaging the adjustable hook to hold it downwardly in a locked position.
REFERENCES CITED The following references are of record in the filie; sent-his .1 spat ent LINI'IZEDSTATES PATENTS Number Name Date 31,953 Farrar Apr. 9, 1861 215,729 Foster May 27, 1879 556,464 Hafiermehl Mar. 17, 1896 679359 11 Dinsmore Mil/1223,1897 1,018,'877 Chickering i Fbr27fl' 1912' 1,030,905 Lucas July- 2, 1912 FOREIGN. PATENTS Number; 1' Country ,v Date Great Britain 7.--- .iIuly i30,;'1898,-
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US31963 *||Apr 9, 1861||Adjustable ladder-hook|
|US215729 *||Oct 4, 1878||May 27, 1879||Improvement in adjustable ladder-hooks|
|US556464 *||Mar 17, 1896||Attachment for ladders|
|US579359 *||Mar 31, 1896||Mar 23, 1897||dinsmore|
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|US1030905 *||Oct 25, 1911||Jul 2, 1912||Herbert S Tompkins||Detachable ladder-hook.|
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|US20060000674 *||Nov 22, 2004||Jan 5, 2006||Werner Co.||Fall arrest system with anchorage plate|
|US20090000868 *||Feb 6, 2007||Jan 1, 2009||Gaines Robert G||Ladder Docking Device|
|US20160130876 *||Sep 25, 2015||May 12, 2016||Slator, LLC||Roofing ladder bracket and safety equipment|
|U.S. Classification||182/206, 24/371|
|International Classification||E06C1/00, E06C1/34|
|Cooperative Classification||E06C7/488, E06C1/345|
|European Classification||E06C1/34A, E06C7/48D|