Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
NUT-DRIVING TOOL
Document Type and Number:
WIPO Patent Application WO/1991/011294
Kind Code:
A1
Abstract:
A tool for driving a nut (22) comprises a socket (2) defining a cavity (10) for receiving the nut, and a body (18) of non-abrasive material that is mounted on the socket and projects beyond the rim (16) of the socket.

Inventors:
DEMOSS JOHN E (US)
Application Number:
PCT/US1990/000462
Publication Date:
August 08, 1991
Filing Date:
January 26, 1990
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
DEMOSS JOHN E (US)
International Classes:
B25B13/06; (IPC1-7): B25B13/06
Foreign References:
US2372269A1945-03-27
US3173462A1965-03-16
US3433108A1969-03-18
US3678789A1972-07-25
USD026618S
Download PDF:
Claims:
Claims
1. A tool ,for driving a nut, said tool comprising a socket (2) defining a cavity (10) for receiving the nut, the cavity being accessible by way of an opening (12) at one end (6) of the socket, said opening being surrounded by a rim (16) , characterized in that a body (18) of non abrasive material is mounted on the socket and projects beyond the rim of the socket.
2. A tool according to claim 1, characterized in that the body of nonabrasive material comprises a substantially annular portion (20) that overlies the rim of the socket.
3. A tool according to claim 2, characterized in that the body of nonabrasive material comprises a sleeve that extends over the peripheral surface (4) of the socket and an inwardlydirected flange that constitutes said annular portion.
4. A tool according to claim 3, characterized by first and second sleeves mounted on opposite respective ends of the socket by frictional engage ment therewith.
5. A tool according to claim 3, characterized i that the sleeve is a loose fit on the socket so that the socket is rotatable freely relative to the sleeve.
6. A tool according to claim 5, characterized in that the sleeve is longer than the socket and the sleeve includes, at its end opposite said flange, retainer means (30) for securing the sleeve to the socket.
7. A tool for driving a nut (22) on a stud (26) against a surface (24) , said tool comprising a socket (2) defining a cavity (10) for receiving the nut, the cavity being accessible by way of an opening (12) at one end (6) of the socket, said opening being surrounded by a rim (16), charac¬ terized by a body (18) of nonabrasive cured synthetic polymer material that is mounted on the socket and projects beyond the rim of the socket, said body comprising a sleeve tHat extends over the peripheral surface (4) of the socket and is mounted on the socket solely by frictional engagement with said peripheral surface, and an inwardlydirected * flange (20) that overlies the rim of the socket, said inwardlydirected flange separating said socket from said surface and acting to prevent abrasion of said surface when said socket drives said nut.
8. A method of manufacturing a tool for driving a nut, said method comprising providing a socket (2) defining a cavity (10) for receiving the nut (22),^the cavity being accessible by way of an opening (12) at one end of the socket, said opening being surrounded by a rim (16), characterized by mounting a body (18) of nonabrasive material on the socket so that it projects beyond the rim of the socket.
9. A method according to claim 8, charac¬ terized in that said method comprises forming the body of nonabrasive material separately from the socket and then mounting it on the socket.
10. A method of manufacturing a tool for driving a nut on a stud against a surface, comprising providing a socket (2) having a peri¬ pheral surface (4) and defining a cavity (10) for receiving the nut (22) , the cavity being accessible by way of an opening (12) at one end of the socket, said opening being surrounded by a rim (16), charac¬ terized by forming a body (18) of nonabrasive material separately from the socket by molding the body from synthetic polymer material in the uncured state and subsequently curing the synthetic polymer material, and mounting the body of nonabrasive material on the socket so that it projects beyond the rim of the socket, the body being solely in frictional engagement with said peripheral surface of said socket so that said body separates said socket from said first surface and acts to prevent abrasion of said first surface when said socket drives said nut.
Description:
NUT-DRIVING TOOL

Cross-Reference to Related Application This is a continuation-in part of co-pending Patent Application Serial No. 07/258,782 filed

October 17, 1988, which is a continuation-in-part of co-pending Patent Application Serial No. 07/221,341 filed July 19, 1988, now abandoned.

Background of the Invention

This invention relates to a nut-driving tool. It is conventional to mount decorative wheels, for example made, of magnesium alloy, polished steel or c romium-plated metal, on large motor vehicles, such as large trucks and motor homes. Such decorative wheels may be mounted on threaded studs that project from the wheel hub and pass through holes in the wheel by means of steel lug nuts that engage the studs. The lug nuts are made of steel, because a decorative finish would be marred by the force that has to be applied to the nut in order to mount the wheel securely. When the nut has been tightened, it is covered by a decorative cap. Lug nuts are generally applied to the wheel-mounting studs using a manually or pneumati¬ cally driven socket. When a conventional socket is used to tighten a lug nut that is being used to mount a decorable wheel, the end face of the socket may rub against the decorative wheel, spoiling its finish. This problem may be avoided by fitting a protective ring, which may be made of synthetic plastic or metal, over all the studs before the lug nuts are tightened. When the lug nuts are tightened, the ring prevents the end face of the socket from touching the wheel. The protective

ring is then removed, and the decorative caps are .placed over the lug nuts. Use of the protective ring is inconvenient.

Similar problems arise when a decorative wheel is mounted using bolts that pass through holes in the wheel and engage holes in the hub, and decora¬ tive caps are fitted over the heads of the bolts.

Summary of the Invention

10 A preferred embodiment of the present inven¬ tion in a first aspect is a tool for driving a nut. The tool comprises a socket that defines a cavity for receiving the nut. The cavity is accessible by way of an opening at one end of the socket, the

15 opening being surrounded by a rim of the socket. A body of non-abrasive material is mounted on the socket and projects beyond the rim of the socket. A preferred embodiment of the present inven¬ tion in a second aspect of a method of manu-

20 facturing a tool for driving a nut. The method comprises providing a socket defining a cavity for receiving the nut, the cavity being accessible by way of an opening at one end of the socket, said opening being surrounded by a rim, and providing a 5 body of non-abrasive material that is mounted on the socket and projects beyond the rim of the socket.

Brief Description of the Drawings

30 For a better understanding of the invention, and to show how the same may be carried into effect, reference will now be made, by way of example, to the accompanying drawings, in which

FIG. 1 is a sectional view of a tool embodying - > _. the present invention and also illustrates

partially a decorative wheel and a stud and lug nut used for mounting the wheel,

FIG. 2 is an end elevation of the tool, FIG. 3 is a partly broken away view of a second tool embodying the invention, and

FIG. 4 is a part sectional view of a third tool embodying the invention.

Detailed Description The tool illustrated in FIGS. 1 and 2 comprises a conventional socket 2, which is generally cylin¬ drical in form, having a cylindrical peripheral surface 4 and two ends 6 and 8. The socket defines a cavity 10, which is accessible through an opening 12 at the.end 6 of the socket, and a square drive recess 14 at the opposite end 8 of the socket. The size of the cavity 10 is suitable for engaging a nut of the size that might be used for mounting a wheel on a large vehicle. The opening 12 is surrounded by a rim 16 of the socket.

The tool also comprises a sleeve 18 of cured synthetic polymer material. The sleeve 18 extends at least part way over the length of the socket and has an inwardly-directed flange 20 that extends over the rim 16 of the socket. Therefore, when the tool is used to drive a lug nut 22 for mounting a decorative wheel 24 on a stud 26, there is no metal-to-metal contact between the socket and the wheel and the appearance of the wheel will not be marred.

The sleeve is manufactured by injection molding in a suitable mold. When the polymer material has' cured, the sleeve is removed from the mold and fitted over the socket. The sleeve is held in position on the socket by frictional

engagement.

If the flange 20 of the sleeve becomes worn, the sleeve can be removed from the socket and a new sleeve fitted on the socket. The socket may be supplied to the customer with two sleeves, fitted on opposite ends respectively of the socket as shown in FIG. 3. When one sleeve is worn, it may be removed and replaced with the other sleeve.

In a second embodiment of the invention, the sleeve is attached to the socket using a suitable adhesive bonding agent. The composition of the polymer material in the second embodiment may be the same as in the case of the first embodiment. In the case of the first and second embodi- ments of the invention, a suitable polymer material for the sleeve is polyurethane. Preferably, the cured polymer material has a hardness of 70-72 D. In a third embodiment of the invention, the sleeve is fitted on the socket sufficiently loosely that the socket is able to rotate easily relative to the sleeve. Preferably, the polymer material includes a friction-reducing additive, such as molybdenum disulfide. These measures enable the user of the tool to hold the sleeve stationary in his hand while driving the socket. In this case, the polymer material may be polyamide with 2 wt% molybdenum disulfide.

In the preferred embodiment of the invention, shown in FIG. 4, the sleeve fits loosely on the socket, as in the case of the third embodiment, but is slightly longer than the socket and is formed with an internal annular rib 30 at the end opposite the flange 20. The internal diameter of the rib 30 is slightly less than the external diameter of the socket, so that when the sleeve is pushed fully

onto the socket, it is retained in position on the socket even though the socket is able to rotate easily inside the sleeve. In the case of this embodiment, the preferred polymer material is polyamide with 2 wt% molybdenum disulfide.

It will be appreciated that the present inven¬ tion is not restricted to the particular embodi¬ ments that have been described and illustrated, and that variations may be made therein without departing from the scope of the invention as defined in the appended claims and equivalents thereof. For example, although the sleeve 18 of the tool illustrated in FIGS. 1 and 2 is molded separately from the socket and is then fitted over the socket, the sleeve may instead be molded directly onto the socket. In this case, the sleeve is bonded firmly to the socket and there is no danger that the sleeve will be inadvertently removed from the socket and misplaced. On the other hand, it is more difficult to replace the sleeve if the flange is worn down. The invention is not restricted to use of an annular flange of non-abrasive material to prevent metal-to-metal contact between the socket and the wheel, and a body of non-abrasive material in another configura¬ tion may be used instead. Although the socket 2 is shown in the drawings as being a six-pointed socket, the invention is not limited to the socket being of this configuration.