AU596513B2

AU596513B2 - Setting devices for masonry anchors

Info

Publication number: AU596513B2
Application number: AU14493/88A
Authority: AU
Inventors: Alan George Logan
Original assignee: ITW Construction Systems Australia Pty Ltd
Current assignee: ITW Construction Systems Australia Pty Ltd
Priority date: 1987-04-22
Filing date: 1988-04-11
Publication date: 1990-05-03
Anticipated expiration: 2008-04-11
Also published as: AU1449388A

Description

C 0OM MON WE A LTi OF A UST RA L IA PATENTS ACT 1952 COMPLETE SPECIFICATION 9 651 3 (Original) FOR OFFICE USE Class Int. Class i'd i'.

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t Application Number: Lodged: Complete Specification Lodged: Accepted: Published: Priority: Related Art: Name of Applicant: Address of Applicant: I t RAMSET FASTENERS (AUST.) PTY. LIMITED.

Maroondah Highway, Croydqn North, in the State of Victoria, Commonwealth'of Australia ALAN GEORGE LOGAN DAVIES COLLISON, Patent Attorneys, 1 Little Collins Street, Melbourne, 3000.

Actual Inventor(%): Address for Service: Complete specification for the invention entitled: "SETTING DEVICES FOR MASONRY ANCHORS" The following statement is a full description, of this invention, including the best method of performinY, it known to-

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00 0000 0004 "SETTING DEVICES FOR MASONRY ANCHORS" 0devices for masonry anchors.

Oft** a *0 4* 000 0 S* There is known a masonry anchor comprising a cylindrical sleeve internally threaded at its outer or proximate end to receive a bolt. At its inner or distal end, the sleeve is internally tapered to receive a setting plug of complimentary shape. An anchor of this type is sold by the present Applicants under the Registered Trade Mark "DYNASET".

Such an anchor is supplied with the setting plug within the sleeve at the wider end of the taper.

The anchor is hammered into a hole drilled in masonry until a flange at the outer end of the anchor is flush against the surface of the masonry. A punch is then put into the sleeve and is hammered in order to displace the plug along the taper and thereby expand the sleeve into tight engagement with.the hole. To the sleeve into tight engagement with .the hole. To rar ~-31 3 achieve the necessary degree of expansion, the Ilug must be displaced along the taper by a pre-determined distance. The punch may include a shoulder which abuts against the flange on the sleeve wien required depth of displacement has been attained, but the So o workman may not always hammer the punch fully into ocoa, the sleeve with the result that the sleeve may not be properly expanded and may subsequently pull out when t a t under load.

oo" I An object of the invention is to provide a tool which facilitates the setting of the anchor into masonry.

0 0 o 15 According to the present invention there is provided a tool for setting a masonry anchor 00** a0: comprising a shank insertable into the chuck of a hammer drill, means defining a hammer face releasably connectable to the shank for driving a masonry anchor 0 0* 20 into a hole in masonry, means operative to cause release of the connection between the shank and the hammer face when the hammer face is adjacent to the masonry surface, and punch means drivable by the shank into the anchor after release of the connection whereby to drive a setting plug to cause expansion of the anchor.

Preferably, the tool includes marker means operative to mark the end of the anchor when the punch has penetrated into the anchor to a depth sufficient to provide correct setting of the anchor.

An embodiment of the invention will now be described, by way of example only. ;lLth reference to r. 4 the accompanying drawings, in which.

Figure 1 is a longitudinal section of a tool in accordance with a preferred embodiment of the .invention, the tool being shown in a normal condition; a a soro Figure 2 is a front end elevation of the Q tool shown in Figure 1; *eo 10 Figure 3 is a longitudinal section taken on line III-III of Figure 2; Figure 4 is a section equivalent to Figure 3 0 9 but showing the tool in a condition in which an 15 anchor has been fully set.

4« 0 The setting tool shown in the drawings comprises a shank adapted for insertion at its rear end into the chuck of a hammer drill. The 20 forward end portion of the shank is of reduced diameter and forms a punch moveable into the interior of the anchor to displace the setting plug, as will be described hereinafter. Rearwardly of the punch-forming forward end portion, the shank is shaped to form a shoulder and behind the shoulder an annular groove with divergent sides.

A sleeve (10) slidably mounted on the r forward end portion of the shank has a front end face (12) which defines a hammer face for hammering the anchor into the hole. The hammer face includes a central projecting boss (14) which surrounds the punch and which is of a size as to ,engage the flange of the anchor with the anchor being located ifl relative to the hammer face by means of the punch (4) which engages within the outer end of the anchor.

Approximately mid-way along its length, the sleeve includes a number of radial bores (16) equiangularly spaced around the axis of the sleeve.

The bores (16) each receive a radially-moveable ,Vo detent The sleeve (10) is biased forwardly o* relative to the shank by means of a compression spring An outer cylindrical shroud (22) is to 10 slidably mounted on the sleeve A compression spring (24) interposed between the sleeve (10) and the shroud (22) biases the shroud (22) axially to a forwards position (as shown in Figures 1 and 2) in which the fol;ard end of the shroud (22) projects 15 beyond the hammer face (12) at the front end of the sleeve a forward stop position of the shroud (22) being defined by engagement of a forwardly-facing annular shoulder (22a) on the shroud (22) with a rearwardly-facing annular shoulder I 20 on the sleeve Rearwardly of the shoulder (22a), the shroud is formed with an annular groove (26) with divergent side walls, and, rearwardly of the groove the shroud (22) is formed with a cylindrical surface (28) which closes the outer ends of the radial bores (16) when the shroud (22) is in its forward stop position.

An indicator bush (30) is slidably mounted on the punch-forming end portion of the shank (2) within the sleeve (10) and is held captive between the shoulder on the shank and the hammer face The bush (30) includes forwardlyprojecting indicator fingers (32) which are normally retracted behind the hammer face (12) of the sleeve iiiii i imj iirniri -i iiim r*n111*11111« 11 iiimifiiiimi-im in iT-r-r -nir iiiiin- ir' In a forward position of the bush (30) the fingers (32) project externally through bores in the central boss (14) in the hammer face (12).

The normal condition of the tool is shown in oV g Figures 1 to 3. In this condition, the shroud (22) is i o in its forward stop position relative to the sleeve with the cylindrical surface (28) closing the o,,o outer ends of the radial bores (16) so that the sS i10 detents (18) engage within the annular groove in the shank and thereby lock the sleeve against axial movement relative to the shank With the tool in this condition, the masonry anchor may be mounted on the punch at the forward end of o 15 the tool, with the flange of the anchor lying against the central boss The anchor can then be driven into a hole in the masonry by actuating the hammer drill in a "hammer only" (no-rotation) mode, the hammer forces being transmitted to the flange via the hammer face (12) of the sleeve.

When the anchor has been driven almost fully into the hole, the forward end of the shroud (22) engages the masonry surface around the hole and is displaced rearwardly relative to the sleeve (10) as the anchor is driven fully home into the hole with the flange flush against the surface. This rearwards displacement places the annular groove (26) in the shroud (22) in alignment with the detent bores (16) when the anchor is fully home. In this condition, continuing axial loading applied by the hammer drill to the shank will displace the shank (2) forwardly relative to the sleeve (10) so that the detents (18) move radially outwardly into the groove "cs-ra -r II *9 99 09 9 9 9 9 9 4 .99 *49

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9( 9 6 9 (26) in the shroud (22) whereby the punch at the forward end of the shank is able to move forwardly into engagement with the setting plug within the inner end of the anchor. Direct transmission of the hammer blows through the shank, drives the plug along the taper to expand the anchor.

As the punch approaches a predetermined depth of insertion at which the plug is driven into 10 its fully set position, the forward end of the shoulder on the shank engages the rear face of the setting bush (30) and displaces the bush forwardly so that the fingers (32) project from the hammer face (12) and indent the end of the anchor.

The indents provide a visual indication of the fact that the plug has been properly set to the required depth whereby the required anchoring forces will be obtained. This condition of the tool is shown in Figure 4. Upon removal of the tool from the anchor, the compression spring (20) displaces the sleeve forwardly relative to the shank to align the detents (18) with the shank groove and the spring (24) displaces the shroud (22) forwardly relative to the sleeve (10) to force the detents (18) from the shroud groove (26) into the shank groove The tool is now in the condition shown in Figures 1 and 2 and is ready for re-use.

The tool described thus enables insertion and setting of the anchor using a hammer drill and permits faster insertion and setting than using a separate hammer and punch. The tool also provides a visual indication on the anchor when it has been correctly set.

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8 The embodiment has been described by way of example only and modifications are possible within the scope of the invention.

Its

Claims

1. A tool for setting a masonry anchor comprising a shank insertable into the chuck of a hammer drill, means defining a hammer face releasably connectable to the shank for driving a masonry anchor into a hole in masonry, means operative to cause release of the connection between the shank and the hammer face when the hammer face is adjacent to the masonry surface, and punch means drivable by the shank into the anchor after release of the connection whereby to drive a setting plug to cause expansion of the anchor.

2. A tool according to claim 1, wherein the means operative to cause release of the connection comprises means mounted on the shank for axial movement relative to the shank and having a forward end which is normally forwardly of the hammer face so as to engage the masonry surface as the anchor is driven into the hole, the arrangement being such that as the hammer face advances relative to the releasing means upon engagement of the forward end thereof with the masonry surface, the releasing means retracts along the shank to thereby release the connection.

3. A tool according to claim 2, wherein the connection is formed by detents held in an operative position between the shank and the hammer face by the releasing means when the releasing means is in its normal position, predetermined retraction of the releasing means along the shank permitting release of the detents. I* sltl 0 0

4. A tool according to claim 2 or claim 3, wherein the releasing means is spring-biased into its normal position.

A tool acccrding to any one of claims 2 to 4, wherein the releasing means comprises a shroud which surrounds the shank and the hammer face.

6. A tool according to any one of claims 1 to wherein the punch is formed by a forward end portion of the shank whereby release of the connection means permits the shank to advance relative to the hammer face and thereby drive the setting plug.

7. A tool according to claim 6, comprising stop means for restricting the extent to which the shank is able to advance relative to the hammer face to thereby drive the setting plug to a predetermined depth into the anchor.

8. A tool according to claim 6 or claim 7, wherein the hammer face comprises a forward end of a sleeve slidably mounted en the shank, with the forward end portion of the shank projecting centrally from the forward face of the sleeve.

9. A tool according to claim 7 and claim 8, wherein the stop means is defined by opposed stop faces on the shank and on the internal surface of the sleeve.

A tool according to claim 9, further comprising an indicator slidably mounted between the opposed stop faces, said indicator including punch iP means projected forwardly from the forward end of the sleeve when the indicator is abutting both stop faces whereby to indent the end of the anchor.

11. A tool according to any one of claims 1 to 9, o° "4 comprising marker means operative to mark the end of or the anchor when the punch has penetrated into the o" anchor to a predetermined depth sufficient to provide oooQ oc*o correct setting of the anchor. oo ooooS

12. A setting tool substantially as hereinbefore described with reference to the accompanying drawings. t a. 00 o Dated this 7th day of April, 1988 DAVIES COLLISON Patent Attorneys for RAMSET FASTENERS (AUST.) PTY LIMITED. 6 a o >f ft