MXPA98005809A - Girato torsion tool - Google Patents

Abstract

A twisting, twisting tool is described, which includes a handle and a head having an aperture defined therein, to receive a polygonal head of a fastener. An internal periphery defining the aperture includes a plurality of annularly spaced slots defined therein, wherein each two adjacent slits are joined by a connecting section. Each connecting section includes a first operative section having an end joined to one of the two adjacent slits and forming one side of the one of the two adjacent slits, a second operative section having one end attached to the other of the two adjacent slits and forming one side of the other of the two adjacent slits and an inoperative section interconnected between the first operative section and the second operative section. The first operative sections or the second operative sections are coupled with the fastener to be twisted and each inoperative section does not engage with the fastener to be twisted

Description

TURNING TORQUE TOOL Field of the invention The present invention relates to a rotating torsion tool which is capable of, in a limited space, twisting (that is, loosening or tightening) the heads of fasteners designed, sized or marked in various ways. measurement systems such as the metric system and the English system.

Description of the Related Art Currently, there are two measurement systems commonly used in the world: the metric system and the English system. Thus, hand tools (such as wrenches for nuts, closed-end wrenches, etc.) and fasteners (such as bolts, screws, nuts, etc.) have different systems of nominal size with which users have problems. U.S. Patent Nos. 5,219,392 and 5,388,486, both issued to Ruzicka et al., Describe a rotary twisting tool with two nominal sizes marked thereon for "twisting" fastener heads of various systems of nominal size. However, it has been found that there is a considerable free rotational angle in such a rotary torsion tool, that is, after coupling a rotating torsion tool (eg, in the form of REF. 27923 a closed-mouth wrench) with a fastener head, the key must be rotated by a considerable angle before it reliably engages and thus "twists" the head of the fastener. This is extremely inconvenient when working in a limited space. The problem of the free rotational angle is aggravated if the rotary twisting tool is a socket wrench. The object of the present invention is to overcome these difficulties and to provide an improved, rotating torsion tool which can be used in a limited space.

BRIEF DESCRIPTION OF THE INVENTION A rotating torsion tool, according to the present invention, includes a handle and a head having an aperture defined therein for receiving a polygonal head of a fastener. An internal periphery defining the aperture includes a plurality of annularly spaced slots defined therein, wherein each two adjacent slits are joined by a connecting section. Each connecting section includes a first operative section having an end joined to one of the two adjacent slits and forming one side of the one of the two adjacent slits, a second operative section having one end attached to the other of the two slits adjacent and forming one side of the other of the two adjacent slits and an inoperative section, interconnected between the first operative section and the second operative section. The first operative sections or the second operative sections are coupled with the fastener to be twisted and each inoperative section does not engage with the fastener to be twisted. The inoperative section can be rectilinear or convex and a convex inoperative section has a maximum depth greater than a diagonal length of the fastener to be twisted. Each inoperative section includes two ends, each terminating at a critical point adapted to engage with a face of the fastener in which the rotating torsion tool has been rotated through a free rotational angle. By such a provision, the rotating torsion tool, according to the present invention, has a relatively small free rotational angle when compared to the rotary torsion tools of the prior art. Other objects, advantages and new features of the invention will become more apparent from the following detailed description, when taken in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic view of a rotating torsion tool according to the present invention, which has a difference of 0.05 mm between two nominal sizes of different systems of nominal sizes marked on it.; Figure 2 is a schematic view of a rotating torsion tool, according to the present invention, which has a difference of 0.1 mm between two nominal sizes of different nominal size systems marked on it; Figure 3 is a schematic view of a rotating torsion tool, according to the present invention, which has a difference of 0.3 rare between two nominal sizes of different nominal size systems marked on it; Figure 4 is a schematic view of a rotating torsion tool, according to the present invention, which has a distance of 0.5 mm between two nominal sizes of different systems of nominal size marked on it; Figure 5 is a schematic view of a rotary torsion tool of the prior art, which has a difference of 0.05 mm between two nominal sizes of different nominal size systems marked thereon; Figure 6 is a schematic view of a rotary torsion tool of the prior art, which has a difference of 0.1 mm. between two nominal sizes of different nominal size system marked on it; Figure 7 is a schematic view of a rotating torsion tool of the prior art, which has a difference of 0.3 mm between two nominal sizes of different nominal size systems marked thereon; and Figure 8 is a schematic view of a rotary torsion tool of the prior art, which has a difference of 0.5 mm between two nominal sizes of different systems of nominal size marked on it.

DESCRIPTION OF THE PREFERRED EMBODIMENTS For a better understanding of the background of the invention, reference is first made to Figures 5 to 8, which illustrate rotating torsion tools, of the prior art (in the form of wrenches of closed mouth by purpose illustrative) having double nominal sizes marked thereon and constructed in accordance with the teaching of US Patents Nos. 5,219,392 and 5,388,486 mentioned above, for twisting the fastener heads of different systems of nominal size (for example, the metric and the English system). Table 1 shows the differences between the two nominal sizes marked on it.

Table 1 Nut wrench double size nominal mm inches mm converted inches difference 6 6.35 0.35 8 5/16 7.94 0.06 9 11/32 8.73 0.27 10 3/8 9.5 0.5 11 7/16 11.11 0.11 13 ** 12.7 0.3 14 9/16 14.29 0.29 16 5/8 15.88 0.12 17 11/16 17.46 0.46 19 19.05 0.05 The difference between the nominal size metric and the nominal size English is inevitable, for example, there is a difference of 0.5 mm between 13 mm and 1/2 inch. Accordingly, the double-sized wrench for tightening nuts, constructed in this manner for both nominal sizes of different systems of nominal size, has an unavoidable free rotational angle. With reference to Figure 5, the rotating torsion tool of the prior art includes a head 90 having an opening (not indicated) with a plurality of concave sections 92 and 93 defined therein, wherein each two adjacent sections 92 and 93 are joined via a convex section 91 which abuts against a face of a fastener head (not indicated) to be loosened or tightened. However, the torsion tool must be rotated by a relatively large free rotational angle before the convex sections 91 (which are relatively small) are supported against the faces of the fastener head. The rotary torsion tool of the prior art, shown in Figure 5, has a difference of 0.05 mm between the two nominal sizes of different nominal size systems marked thereon, wherein a maximum free rotational angle thereof is of seventeen (17) degrees for a small size bra head or eighteen (18) degrees for a large size bra head. If the torque tool is a socket wrench, for example with 72 teeth, the minimum free rotational angle will be the angle mentioned above (17 or 18 degrees) plus five degrees (360/72 = 5) and for a spanner receptacle nuts with 36 teeth, the minimum free rotational angle will be the angle mentioned above (17 or 18 degrees) plus ten degrees (360/36 = 10). Figure 6 shows a rotary torsion tool of the prior art, which has a difference of 0.1 mm between two nominal sizes of different systems of nominal size marked on it, where a maximum free rotational angle thereof is eighteen (18) degrees for a small size bra head or 22.6 degrees for a large size bra head. Figure 7 shows a rotary twisting tool of the prior art, which has a difference of 0.3 mm between two nominal sizes of different nominal size systems marked on it, where a maximum free rotational angle of the same is eighteen (18) degrees for a small size bra head or 27.6 degrees for a large size bra head. Figure 8 shows a rotary torsion tool of the prior art, which has a difference of 0.5 mm between two nominal sizes of different systems of nominal size marked on it, where a maximum free rotational angle thereof is eighteen (18) degrees for a small size bra head or thirty nine (39) degrees for a large size bra head. If the torque tool is a socket wrench, an additional free rotational angle is required as mentioned in the previous paragraph. Consequently, the torque tool of the prior art is inconvenient to use and sometimes even inoperative when it is in a limited space. Reference is now made to Figures 1 to 4, which illustrate rotating torsion tools in accordance with the present invention. For purposes of explanation, the rotary twisting tool is illustrated as a closed-mouth wrench. However, it will be appreciated that the rotary twisting tool may be in any other way, for example, a socket wrench or the like. With reference to Figure 3, the closed-mouth wrench, designated by the reference numeral "100" includes a handle 10 and a head 20 having an opening (not indicated) defined therein for receiving a polygonal head of a fastener 30 (for example, of a system of nominal size English) or a fastener 40 (for example of a system of nominal size metric). An internal periphery (not indicated) defining the opening includes a plurality of annularly spaced slits 21, 23 defined therein, wherein each two adjacent slits 21 and 23 are joined by a connecting or joining section 22. Each section connection 22 includes a first operating section 213, having one end attached to one of the two adjacent slits (e.g., slit 21) and forming one side of the slit 21, a second operative section 231 having a joined end to the other of the two adjacent slits (slit 23) and forming one side of the slit 23 and an inoperative section 22 joined between the first operative section 213 and the second operative section 231. More specifically, the slit 21 includes an intermediate section 212 which does not come into contact with the fastener 30, 40 and two sides (i.e., operative sections) 211 and 213, which come in contact with the fastener 30, 40 insofar as the slit 23 includes an intermediate section 232, which does not come into contact with the fastener 3Q, 40 and two sides (i.e., operative sections) 211 and 213, which come into contact with the fastener 30, 40. Each inoperative section 22 includes two ends which terminate at points Pl and P2, respectively. More specifically, the fastener 30, 40 does not come into contact with the inoperative section 22 defined between the two end points Pl and P2, which is quite different from the prior art tools shown in Figures 5 to 8, also as any other tool of the prior art. The inoperative section 22 can be rectilinear or concave (see dotted lines). During operation, the faces of the fastener 30, 40 rest against the operative sections 211, 213, 231, 233, etc. In addition, the inoperative section 22, if it is in a convex contour, has a maximum depth greater than a diagonal length of the fastener to be twisted. With reference to Figure 3, when the fastener 30 is twisted (eg, 1/2 inch), if the closed-end spanner 100 is rotated in the direction of the clockwise direction by a free rotational angle, each face of the fastener 30 rests firstly against the associated inoperative section 22 at the point P2 and the additional rotation of the closed-end spanner 100 causes the face of the fastener 30 to engage with the associated operative section 211, 231 If the closed-end wrench 100 is rotated in the opposite direction to the direction of clockwise rotation by a free rotational angle, each face of the fastener 30 bears first against the associated inoperative section 22 at the point Pl and the further rotation of the closed-end wrench 100 causes the face to engage with the associated operative section 211, 231. Similarly, when the fastener 40 (for example, 13 mm) is twisted, if the spanner closed 100 is rotated in the direction of the clockwise direction by a free rotational angle, each face of the fastener 40 bears first against the associated inoperative section 22 e n the point P2 and the additional rotation of the closed-end wrench 100 causes the face to be coupled with the associated operative section 213. If the closed-ended spanner 100 is rotated in the opposite direction to the direction of the turn of the hands of the watch, by a free rotational angle, each face of the fastener 40 rests first against the associated operative section 22 at the point Pl and the additional rotation of the closed-end wrench 100 causes the face of the fastener 40 to engage with the associated operating section 213. In other words, for both fasteners 30 and 40 of different systems of nominal size, the points Pl and P2 are critical points which are first engaged with the faces of the fastener to be twisted after having rotated the spanner by the free rotational angle. The closed-end wrench of figure 1 has a difference of 0.05 mm between two nominal sizes of different nominal size systems marked on it, where a maximum free rotational angle for the same is four (4) degrees for a Small size bra head and a large size bra head. Figure 2 shows a closed-end wrench according to the present invention, which has a difference of 0.1 mm between two nominal sizes of different systems of nominal size, marked on it, wherein a maximum free rotational angle for the same is four (4) degrees for a small size bra head or eight (8) degrees for a large size bra head. Figure 3 shows a wrench with a closed mouth according to the present invention, which has a difference of 0.3 mm between two nominal sizes of different nominal size systems marked on it, where a maximum free rotational angle for the same It is eight (8) degrees for a small size bra head or sixteen (16) degrees for a large size bra head. Figure 4 shows a wrench with a closed mouth according to the present invention, which has a difference of 0.5 mm between two nominal sizes of different nominal size systems marked on it, where a maximum free rotational angle for the same It is fourteen (14) degrees for a small size bra head or thirty (30) degrees for a large size bra head. If the torque tool is a socket wrench, an additional free rotational angle is required as mentioned above. With reference to Figures 1 to 4, it will be appreciated that the slots 21, 23 of a wrench for tightening nuts with a smaller nominal size difference (e.g., 0.05 mm, see Figure 1) is smaller than the slits. 21, 23 of a wrench with a larger nominal size difference (eg 0.5 mm, see figure 4). The differences between the spanner of the prior art and spanner of the present invention, in the free rotational angle, it is listed in the, abla 2: Table 2 free rotational age previous technique of the invention difference in size 1 * 2 * 1 * 2 * 0.05 mm 17 18 4 4 0.1 mm 18 22.6 4 8 0.3 mm 18 27.6 8 16 0.5 mm 18 39 14 30 1 *: small size fastener head 2 *: large size fastener head As can be seen from table 2, double nominal size spanners, constructed in accordance with the present invention, have relatively more free rotational angles small, when compared to those of the double-sized wrenches of the previous technique. As a result, the wrenches of the present invention are advantageous when used in limited spaces. Although the invention has been explained in relation to its preferred embodiment, it will be understood that many other modifications and possible variations can be made without deviating from the spirit and scope of the invention as claimed hereinafter. It is noted that, in relation to this date, the best method known by the applicant to carry out the aforementioned invention, is the conventional one for the manufacture of the objects to which it refers. Having described the invention as above, property is claimed as contained in the following

Claims (5)

1. Claims 1. A rotating torsion tool characterized in that it comprises a handle and a head having an aperture defined therein, adapted to receive a polygonal head of a fastener, an internal periphery, which defines the aperture, which includes a plurality of spaced slots annularly defined therein, every two adjacent slits are joined by a connecting section, each connecting section includes a first operative section having one end joined to one of the two adjacent slits and forming one side of the one of the two adjacent slits, a second operative section having one end joined to the other of the two adjacent slits and forming one side of the other of the two adjacent slits and an inoperative section joined between the first operative section and the second operative section; one of each first operative section and each second operative section is coupled with the fastener to be twisted and each inoperative section is rectilinear and does not engage with the fastener to be twisted. The rotating torsion tool according to claim 1, characterized in that each inoperative section includes two ends, each of which ends at a critical point adapted to engage with a face of the fastener in which the torsion tool rotating has been rotated by a free rotational angle. 3. A rotating torsion tool, characterized in that it comprises a handle and a head having an opening defined therein, adapted to receive a polygonal head of a fastener, an internal periphery which defines the opening, which includes a plurality of grooves spaced annularly defined therein, every two adjacent slits is joined by a connecting section, each connecting section includes a first operative section having one end joined to one of the two adjacent slits and forming one side of the one of the two adjacent slits, a second operative section having one end joined to the other of the two adjacent slits and forming one side of the other of the two adjacent slits and an inoperative section joined between the first operative section and the second operative section; a each first operative section and each second operative section is coupled with the fastener to be twisted and each inoperative section is convex and does not engage with the fastener to be twisted 4. The rotary torsion tool according to claim 3, characterized in that the convex inoperative section has a maximum depth greater than a diagonal length of the fastener to be twisted. The torsion tool according to claim 3, characterized in that each inoperative section includes two ends, each of which ends at a critical point. adapted to be coupled with a fastener face, in which the rotating torsion tool has been rotated by a free rotational angle.