GB2213420A

GB2213420A - Nail driving tool

Info

Publication number: GB2213420A
Application number: GB8827175A
Authority: GB
Inventors: Julien Jean Louis Lankry
Original assignee: Individual
Current assignee: Individual
Priority date: 1987-12-08
Filing date: 1988-11-21
Publication date: 1989-08-16
Also published as: GB8827175D0

Abstract

A nail driving tool (10) comprises a cylindrical body (11), one end (12) of which is adapted to be received in the jaws of a hammer effect machine. A rod member (13) extends axially of the body (11) and passes through a bore (18) in a nail engaging member (17). A nail (19) is held within the bore (18) by a magnetic bush (25) and is driven into the object by repeated impacts of the percussive tool on body 11, causing it to move wholly relative to the nail engaging member (17) against the restraint imposed by a spring (23). <IMAGE>

Description

NAIL DRIVING TOOL This invention relates to nail driving tools, and in particular to nail driving tools for use with a hand hammer drill or pneumatic hammer.

There are many situations in which driving a nail is difficult, either because of the location, e.g. driving nails into ceilings or other overhead locations, or because access to the nail with a conventional hammer is restricted. Even when there are no restraints on access and the location does not create difficulties, there is always present the risk of a user of a conventional hammer hitting his or her own hand as the user steadies the nail at the commencement of driving the nail home.

It is an object of the present invention to provide a nail driving tool which overcomes or avoids, at least to a substantial extent the abovementioned disadvantages.

The invention provides a nail driving tool comprising a body of generally cylindrical form having one end thereof adapted to be received in the jaws of a hammer effect machine, a nail engaging means telescopingly engaged with the said body, the nail engaging means having a through bore thereto, and a rod member extending axially both of said body and said nail engaging means, the nail engaging means being adapted to receive a nail in a remote end of the said bore and the rod member being positionable in said bore for movement axially thereof, on relative movement between the nail engaging means and the body, to engage a nail received in said remote end. Said nail engaging means may have an enlarged cylindrical piston part at one end thereof, which piston part is slidably received in said internal bore of said body.A compression spring may be disposed in said internal bore of said body between said piston part and a base wall of said internal bore to bias said nail engaging member in a direction away from said one end of said body. Said body may have a cap secured on said remote end thereof adapted to retain said piston part within said internal bore of said body. Said cap may be screwed on to said body.

Said rod member may be adjustable axially of said body, and may be received in a threaded bore in said one end of said body. A locking screw may be provided to secure said rod member in any desired position of axial adjustment relative to said body.

Said nail engaging member may have at least an end portion thereof remote from said piston part of magnetic material to assist in retaining a nail therein.

Said nail engaging member may also have a work surface contacting member around said remote end thereof. Said work surface.

contacting member may be of a rubber or a plastics material.

The invention will now be described with reference to the accompanying drawing in which: Fig. 1 is a sectional elevation of one embodiment of nail driving tool in accordance with the invention in a start of driving configuration, and Fig. 2 is a sectional elevation of the tool of Fig. 1 in the configuration reached when nail driving is almost completed.

Referring now to the figures there is shown a nail driving tool 10 comprising a body 11 of steel or other suitable material. One end 12 of the body 11 is of reduced diameter compared with the remainder of the body 11 and is adapted to be received in the jaws or chuck of a conventional electric hammer drill (not shown). A rod member 13 has an enlarged screwthreaded end 14 which is received in a screwthreaded:bore 15 provided in the end 12 of the body 11. The rod member 13 extends along the axis of the body 11 and is adjustable relative to the body 11 in a direction along that axis by screwing the rod member 13 in the required direction along the threaded bore 15. A locking screw 16 is provided in the threaded bore 15 to lock the rod member 13 in any required position of axial adjustment.

The rod member 13 extends beyond the body 11 and into an axial bore 18 of a nail engaging member 17, in which bore 18 a nail 19 is received. One end of the nail engaging member 17 is of larger diameter than the remainder of the nail engaging member 17 so as to form a piston part 20 which is slidably received in an internal bore 21 of the body 11. The internal bore 21 is open at the end of the body 11 remote from the one end 12, and a cap 22 is screwed onto the body at that remote end to retain the piston part 20 within the internal bore 21 between the piston part 20 and a base wall 24 of the internal bore 21. The spring 23 resiliently biasses the nail engaging member 17 in a direction away from the one end 12 of the body 11.

At the end of the nail engaging member 17 remote from the piston part 20 there is provided a bush 25 of magnetic material so as to assist in retaining a nail 19 within the bore 18. Around the magnetic bush 25 and part of the nail engaging member 17 is a work surface contacting member 26 which is preferably of a softer material than steel, for example a rubber or plastics material.

In use, the end 12 of the tool 10 is placed in the jaws or chuck of an electric hammer drill (not shown), or in an adapter 27 (shown in dashed lines in Fig. 2) which is itself placed in the jaws or chuck of a pneumatic hammer (not shown). The tool 10 is extended to the configuration shown in Fig. 1 so that a nail 19 can be inserted in the bore 18 of the nail engaging part 17. The drill or pneumatic hammer, and the body 11, are then pushed towards a work surface 28 into which the nail 19 is to be driven so that the point of the nail 19 and the work surface contacting member 26 are in contact with the work surface 28 and the free end of the rod member 13 is in contact with the head of the nail 19. The drill or pneumatic hammer are then operated so that hammer blows are transmitted therefrom through the end 12 of the body 11 and through the rod member 13 to the nail 19.

As the nail 19 penetrates the work surface 28 the body 11 will move relative to the piston part 20 against the force of the spring 23 towards the configuration shown in Fig. 2. When the cap 22 comes into contact with the work surface contacting member 26 and/or the spring 23 is fully compressed, the nail 19 cannot be driven further into the work surface 28. In order to adjust the final position of the head of the nail 19 relative to the work surface 28, i.e. proud of, level with, or recessed within that surface 28, the final position of the free end of the rod member 13 relative to the work surface contacting faces of the bush 25 and work surface engaging member 26, i.e. withdrawn therefrom, level with or extending beyond such faces, can be adjusted by releasing locking screw 16 and screwing the rod member 13 in the appropriate direction along the threaded bore 15. The locking screw 16 is then tightened against the rod member 13.

Since the work surface contacting member 26 is of a relatively soft material, damage to the work surface 28 is avoided or minimised.

By means of the invention.nails can be readily driven into work surfaces when access thereto is restricted or when the location of the work surface makes use of a conventional hammer difficult. In addition, the risk of striking one's hand, as is ever present when a conventional hammer is used, is avoided by use of the nail driving tool of the invention.

Claims

1. A nail driving tool comprising a body of generally cylindrical form having one end thereof adapted to be received in the jaws of a hammer effect machine, a nail engaging means telescopingly engaged with the said body, the nail engaging means having a through bore thereto, and a rod member extending axially both of said body and said nail engaging means, the nail engaging means being adapted to receive a nail in a remote end of the said bore and the rod member being positionable in said bore for movement axially thereof on relative movement between the nail engaging means and the body, to engage a nail received in said remote end.

2. A nail driving tool according to claim 1, wherein said nail engaging means is slidable relative to said body in an internal axial bore of said body.

3. A nail driving tool according to claim 1 or 2, wherein said nail engaging means is biassed outwardly of said body part by a compression spring.

4. A nail driving tool according to any one of the proceeding claims, wherein said nail engaging means has an enlarged cylindrical piston part at one end thereof, which piston part is captive in said internal bore of said body and is slidable relative thereto.

5. A nail driving tool according to any one of the proceeding claims, wherein a compression spring is disposed in said internal bore of said body between said piston part and a base wall of said internal bore to bias the nail engaging means outwardly of said body part.

6. A nail driving tool according to any one of the proceeding claims, wherein said nail engaging means has a work surface contacting member around an end thereof remote from said body part.

7. A nail driving tool as claimed in claim 6, further including a magnetic bush at an end of the nail engaging means remote from said body part, said magnetic bush being supported by said work surface contacting member.

8. A nail driving tool according to claim 6 wherein said work surface contacting member is of a flexible material.

9. A nail driving tool according to any one of the proceeding claims, wherein said rod member is adjustable axially of said body.

10. A nail driving tool according to claim 9 wherein the internal bore of the body is of stepped configuration and said rod member is received in a threaded bore in said one end of said body, there being a locking screw to secure said rod member in any desired position of axial adjustment relative to said body.

11. A nail driving tool substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.