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Publication numberUS2236079 A
Publication typeGrant
Publication dateMar 25, 1941
Filing dateFeb 23, 1940
Priority dateFeb 23, 1940
Publication numberUS 2236079 A, US 2236079A, US-A-2236079, US2236079 A, US2236079A
InventorsFrank F Wipper
Original AssigneeMone B Call
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Wall bolt
US 2236079 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

Much 25 1941. F. F.i wai-PER 2236,079

WALL Bour Filed Feb. 23, 1940 HHHHHHHHMHHHIIHHHHH Flu-m411- Patented Mar. 25, '1941 l UNITED STATES PATENT OFFICE WALL BOLT Funk r. wipper, Fresno, cuir., assigneror ten -per cent to La Mone B. Cali, Fresno. Calif. I

Application February 23, 1940, Serial No. 320,438

2 Claims.

This invention relates generally to wall bolts, and in particular the invention is directed to an improved wall bolt of the type used to attach ilxtures and the like on a wall at a point where no stud or other tinck solid member is available.

The principal object of the present invention is to provide a Wall bolt of unique construction. and a bolt which is not only easier to install but provides much greater support than the now commonly used toggle type wall bolt.

Another object oi' the invention is to provide a wall bolt of the type described, which after being installed can be readily removed it necessary, and without damage to the portion of the wall surrounding the hole initially bored to receive the bolt. i

A further'obiect oi' the invention is to produce a simple and inexpensive device and yet one which will be exceedingly effective for the purpose for which it is designed.

These objects I accomplish by means of such structureland relative arrangement of parts as will fully appear by a perusal of the following specification and claims.

In the drawing similar characters of reference indicate corresponding parts in the several views:

Figure 1. is an elevation of the improved wall bolt as inserted through a wall but before being drawn up or secured.

Figure 2 is a sectional elevation of the same.

Figure 3 is a sectional elevation of the device in secured position.

Figure 4 is an outer end view of the wall plug.

Figure 5 is an inner end view of the device in secured position.

Figure 6 is a sectional elevation oi a slightly modied form of the device as inserted through a wall but before being drawn up or secured.

Referring now more particularly to the characters of reference on the drawing, and particularly at present to the embodiment of the invention shown in Figs. 1 to 5 inclusive, the device comprises a substantially cylindrical plug I, preferably of a relatively soft metal such as lead. This plug is provided with an axial bore 2 through which a relatively long bolt 3 extends in rotatable relation. Longitudinally extending,

eircumferentially spaced ribs l project radially outward from the exterior of the plug and prevent rotation thereof whenthe plug is driven into a hole bored in a plaster and lath wall 5, the hole being bored substantially the same diameter as that of the plug. 'I'he head la of bolt 3 is disposed outwardly of the outer end of the plug and when the device is in use, engages with the fixture 8 which is to be supported and through which the bolt projects; the ilxture being clamped between head la and the outer suriace of wall 5.

To secure the device with the following structure:

The bolt I, being relatively long, projects some distance inwardly beyond plug I and wall 5. such projecting portion being threaded as shown at l. A head I is threaded on bolt portion l. and 10 the adjacent ends of plug I and head 8 are formed with axial necks 9 of reduced diameter. The head 8 is initially adjacent the inner end of the bolt, as shown in Figs. 1 and 2.

A plurality of longitudinally extending, relatively stil! but bendable metal strips III extend /f between and at their ends rest on said necks 8; these strips being circumferentially spaced about/ the necks and radially spaced from bolt 3. The ends of the strips are vfixed with the necks/by means oi' clamping rings Il which deformf the adjacent portions oil the strips into annular i grooves I2 in the necks. Centrally of their ends, the strips III are deformedor struck out: radially of bolt 3 and as indicated at Il. Tofsecure the device with the wall, the bolt 3 is" rotated by means of head 3a; the direction uof rotation being such as to cause the threaded head 8 to move along the bolt in the direction of the wall.

As a result of such movement. the strips Il ilrst bow outwardly and with continued movef ment of the head iinally fold as radially projecting loops L (see Fig. 3),. one side of which rmly and frictlonally engage the adjacent wall surface. The plug is of s'uch a length that the adjacent ends of the strips Ill terminate within. the bore cut for said plug; this feature assuring that loops L firmly engage the wall.

,By means of the above described wall bolt, a fixture can be ilrmly and securely mounted on a plaster and lath, or wallboard wall at a point where no stud or other rigid member is present.A Due to the extent of contact of loops L with the inner surface of the wall, there is no tendency for the bolt to pull out oi the wall or to fracture and crack the plaster adjacent the plug I.

If it is ever necessary to remove the device from the wall, bolt 3 is rotated in a direction to move head 8 away from plug I; such movement unfolding loops L, and returning same to substantially their initial coniiguration and parallel to said bolt whereupon the device can be withdrawn from the wall.

IIhe embodiment illustrated in Fig. 6 comprises.l the same structure as above described, but in ad- 55 the wall, I provide 5 dition includes a soft and deformable rubber sleeve S surrounding bolt 3 between the necks 8 o1' plug l and head 8; this sleeve being of sufcient diameter to snugly occupy the space between the bolt and strips l0. The purpose of said soft and deformable rubber sleeve is to assure that strips it bow outward and ilnally fold together as head t moves toward plug il; the expansion or radial deformation of the rubbei* sleeve caused by the longitudinal compression theneo pressing against strips i@ and efecting desired result.

lrorn the foregoing description it will be readily eeen that have produced such a device as substantially Julills the objects of the invention as fh herein,

ssecication sets forth detail jcresent preferred construction oi the e, sii i practice such deviations from such der resorted to as do not forni a pari-.nre iron?. t e of the invention, de-

Y sus described invention, what 'i s nsw and useful and desire to secure by sters Patent is:

A viali bolt comprising a plug having an an ial bore, a bolt rotatably extending through said bore and projecting beyond the plug, the projecting portion of the bolt being threaded, a. head threaded on the bolt and initially disposed some distance from the plug, axial necks formed on adjacent ends of the plug and head, a plurality ol bendable metal strips engaging at their ends on and extending longitudinally between 'said necks, and means securing said ends of the strips on the necks in fixed relation; said means cornprising clamping rings surrounding the ends o the strips and necks, the necks having annular grooves therein and rings deforming the adjacent portions of the strips thereinto.

2. in a wall bolt assembly, a rotatable bolt, a

. pair oi initlmly spaced members on the bolt and arranged for .relative approaching movement upon rotation ci said holt, a plurality oi bendable metal strips secured on extending be tween members longitudinally' of 'out spaced 'the holt, aad a deformable rubber sleeve the bolt extending from mem-- tier to member, sleeve snugly engaging hetri/'een the bolt and; said strips.


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2521065 *Apr 23, 1946Sep 5, 1950Kempton Henry FAnchor bolt
US2538601 *Aug 10, 1945Jan 16, 1951Rawiplug Company LtdExpanding fastener
US2616328 *Feb 1, 1951Nov 4, 1952William F Mathias JrFastener
US3143916 *Apr 3, 1962Aug 11, 1964A A Rice IncCollapsible self-anchoring device
US3257889 *Aug 8, 1963Jun 28, 1966Fischer ArturExpansion shield
US3373630 *Apr 29, 1966Mar 19, 1968Gen Motors CorpSteering column assembly
US3487746 *Apr 1, 1968Jan 6, 1970Bertram H KapnekScrew anchor
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US3942407 *Aug 6, 1974Mar 9, 1976Aackersberg MortensenExpandable screw anchoring devices
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U.S. Classification411/38
International ClassificationF16B37/04, F16B13/06, F16B13/04, F16B37/06
Cooperative ClassificationF16B37/067, F16B13/061, E04B1/40
European ClassificationE04B1/40, F16B13/06A, F16B37/06B2B