Wrench

BACKGROUND OF THE INVENTION

00011. Field of the Invention

0002The present invention relates to a wrench, and more particularly to a wrench which can be adapted to be used in narrow working spaces, and a wrench which can be driven by a tool for operating.

00032. Description of the Prior Art

0004Conventional wrenches are disclosed in patents such as U.S. Pat. No. 5,540,122, 4,867,016, 4,491,042 and US20040093990. The wrenches in the patent mentioned above use various driving structures to enable those wrenches of being driven by a tool to operate in narrow working spaces. In other words, those wrenches use a single driving structure to have an end of one working member drive an end of another working member.

0005The wrenches described above are straight and flat-shaped. However, speaking of operating in narrow working spaces, it's not easy for users to hold the straight and flat-shaped wrench. Thus, users would hold the wrench unstably with shaking, and it's also difficult to focus power on one of the working members in order to drive another working member rotating. As a result, users need more time and attention to finish a work. Moreover, it is also possible that the wrench would fall into the narrow working space during an operation period because of holding unstably.

0006Therefore, a wrench with a special design could improve the problems mentioned above. For instance, a wrench with stair-shaped design could be an option. If the wrench is made with stair-shape design, and those two working members still have to be driven by the driving structure to keep effects of linking rotation. An outer shell of the wrench with stair-shaped design needs to be enlarged so as to contain those two working members and the driving structure. On the other hand, once the outer shell is enlarged, the wrench would not be able to enter the narrow working space, and advantages before reforming are nonsense as well. The application of the stair-shaped wrenches would be limited.

0007Furthermore, because the wrenches mentioned above have only a single driving structure, those wrenches can only be equipped with two working members at two ends of wrenches along a longitude direction of those wrenches. When working in some narrow working spaces, penetrating holes of both two ends of the shell, protruded by a working member, are obstructed due to an operation angle, so users can not drive any working member through any penetrating hole on both two ends of the shell. That means applications of the wrenches are limited by working environments.

0008With concerns about problems described above, it is necessary to design a wrench which can be held stably with minimized size, and be adapted to be used in various narrow spaces of working environments.

SUMMARY OF THE INVENTION

0009The main object of the present invention is to provide a wrench which can be held stably with minimized size, and can be adapted to be used in various narrow spaces of working environments.

0010To achieve the above, a wrench of the present invention includes a transmitting device and a shell. The transmitting device includes a rotor, a first working member, a second working member, a first linking member and a second linking member. The rotor includes an upside driving portion and an underside driving portion. The first working member has at least a head, and the second working member also has at least a head. The first linking member is disposed between the first working member and the upside driving portion, and the second working member is disposed between the second working member and the underside driving portion. The shell has a containing room, used for the transmitting device to be positioned therein. The shell has a first section, a second section, and a middle section, and the middle section has a first end and a second end. The first end extends upwardly to connect with the first section, and the second end extends downwardly to connect with the second section. Thus, one stair portion of different horizontal level is formed between the first section and the middle section, another stair portion of different horizontal level is formed between the second section and the middle section. The first section has a penetrating hole, and the first working member is disposed in the first section. The head of the first working member protrudes from the penetrating hole of the first section. The second section also has a penetrating hole, and the second working member is disposed in the second section. The head of the second working member protrudes from the penetrating hole of the second section as well.

0011The wrench of the present invention is stair-shaped so that users can have some spaces for hands to hold the wrench stably when working. As such, users can focus power on the wrench easier without slipping. And the wrench can be adapted to be used in various narrow spaces. Moreover, the wrench uses the rotor and two linking members to drive the first working member and the second working member rotating. Therefore, the total size of the wrench can be kept as smaller as possible. And the transmitting device can still keep the best effects of linking and rotating. The present invention will become more obvious from the following description when taken in connection with the accompanying drawings, which show, for purpose of illustrations only, the preferred embodiment(s) in accordance with the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

0012<figref idref="DRAWINGS">FIG. 1</figref> is a stereogram showing a first embodiment of the present invention;

0013<figref idref="DRAWINGS">FIG. 2</figref> is a decomposition drawing of a first embodiment of the present invention;

0014<figref idref="DRAWINGS">FIG. 3</figref> is a perspective drawing from a side view of a first embodiment of the present invention;

0015<figref idref="DRAWINGS">FIG. 4</figref> is a perspective drawing from an up-side view showing a first embodiment of the present invention;

0016<figref idref="DRAWINGS">FIG. 5</figref> is an operating condition drawing of the first embodiment of the present invention;

0017<figref idref="DRAWINGS">FIG. 6</figref> is a decomposition drawing of a second embodiment of the present invention;

0018<figref idref="DRAWINGS">FIG. 7</figref> is a decomposition drawing of a third embodiment of the present invention;

0019<figref idref="DRAWINGS">FIG. 8</figref> is a decomposition drawing of a fourth embodiment of the present invention;

0020<figref idref="DRAWINGS">FIG. 9</figref> is an operating condition drawing of the fourth embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

0021Please refer to <figref idref="DRAWINGS">FIG. 1</figref> to <figref idref="DRAWINGS">FIG. 3</figref> for the first embodiment of the present invention. A wrench of the present embodiment includes a transmitting device and a shell.

0022The transmitting device comprises a rotor <b>11</b>, a first working member <b>12</b>, a second working member <b>13</b>, a first linking member <b>14</b> and a second linking member <b>15</b>. The rotor <b>11</b> comprises an upside driving portion <b>111</b> and an underside driving portion <b>112</b>. The first working member <b>12</b> has at least a head <b>121</b>, and the second working member <b>13</b> has at least a head <b>131</b>. The heads <b>121</b>, <b>131</b> mentioned above can be adapted to be inserted by a cylinder A or a tool, as shown in <figref idref="DRAWINGS">FIG. 5</figref>. The first linking member <b>14</b> is disposed between the first working member <b>12</b> and the upside driving portion <b>111</b>, and the second linking member <b>15</b> is disposed between the second working member <b>13</b> and the underside driving portion <b>112</b>. To increase an efficient structure to the present invention, the first working member <b>12</b> comprises a toothed plate <b>122</b>, and the second working member <b>13</b> can comprise a toothed plate <b>132</b>. The upside driving portion <b>111</b> can comprise a toothed plate, and the underside driving portion <b>112</b> can comprise a toothed plate. The first linking member <b>14</b> is disposed between the toothed plate <b>122</b> of the first working member and the toothed plate <b>111</b> of the upside driving portion. The second linking member <b>15</b> is disposed between the toothed plate <b>132</b> of the second working member and the toothed plate <b>112</b> of the underside driving portion. Each of the first linking member <b>14</b> and the second linking member <b>15</b> is a chain. As such, the first linking member <b>14</b> can be rotational engaged between the toothed plate <b>122</b> of the first working member and the toothed plate <b>111</b> of the upside driving portion. The second linking member <b>15</b> can be rotational engaged between the toothed plate <b>132</b> of the second working member and the toothed plate <b>112</b> of the underside driving portion. In the second embodiment of the present invention, as shown in <figref idref="DRAWINGS">FIG. 6</figref>, each of the first linking member <b>14</b> and the second linking member <b>15</b> can also be a toothed chain. Of course, structures of the first linking member and the second linking member of the present invention are not limited by the structure described above. Taking the third embodiment for instance, as shown in <figref idref="DRAWINGS">FIG. 7</figref>, the chains or the toothed chains described above are replaced by two belts, serving as the first linking member <b>14</b> and the second linking member <b>15</b>. And the same rotating function of linking can also be achieved without the toothed plate serving as the first working member <b>12</b>, the working member <b>13</b>, the upside driving portion <b>111</b> and the underside driving portion <b>112</b>.

0023Please refer to <figref idref="DRAWINGS">FIG. 1</figref> to <figref idref="DRAWINGS">FIG. 5</figref>, the shell has a containing room <b>21</b>, and the transmitting device is disposed in the containing room <b>21</b>. The shell comprises a first section <b>22</b>, a second section <b>23</b>, and a middle section <b>24</b>. The middle section has a first end <b>241</b> and a second end <b>242</b>, two sides <b>243</b>, a top surface <b>244</b> and a bottom surface <b>245</b>. The first end <b>241</b> extends upwardly to connect with the first section <b>22</b>, the second end <b>242</b> extends downwardly to connect with the second section <b>23</b>. Thus, one stair portion of different horizontal level is formed between the first section and the middle section, another stair portion of different horizontal level is formed between the second section and the middle section. The first section <b>22</b> has a penetrating hole <b>221</b>, and the first working member <b>12</b> is disposed in the first section <b>22</b>. The head <b>121</b> of the first working member protrudes from the penetrating hole <b>221</b> of the first section. Also, the second section <b>23</b> has a penetrating hole <b>231</b>, and the second working member <b>13</b> is disposed in the second section <b>23</b>. The head <b>131</b> of the second working member protrudes from the penetrating hole <b>231</b> of the second section.

0024Please refer back to <figref idref="DRAWINGS">FIG. 5</figref> again, when users use the wrench to disassemble a screw, the second working member <b>13</b> can be rotated by a tool. Meanwhile, the second linking member <b>15</b>, the rotor <b>11</b>, the first linking member <b>14</b> and the first working member <b>12</b> would be driven to rotate by the second working member <b>13</b>. The cylinder A is disposed on the first working member <b>12</b> so that the cylinder A could engage with the screw. The cylinder A would be driven to rotate with disassembling the screw from a constructing surface when the first working member <b>12</b> rotates.

0025Because the wrench of the present invention is stair-shaped, the wrench would not completely fit with the constructing surface. Some spaces would be left for users' hand to hold the wrench stably. As such, users can focus power on the wrench easier without slipping. The two sides <b>243</b> of the middle section have plural grooves <b>246</b> respectively. The plural grooves <b>246</b> can be used for users' hand to hold stably. The plural grooves <b>246</b> of each side is interval arranged with each other. Positions of the plural grooves <b>246</b> on one side <b>243</b> are symmetrical to positions of the plural grooves <b>246</b> on another side <b>243</b>. As such, users can hold the wrench stably and conveniently.

0026Furthermore, because the rotor <b>11</b>, the first linking member <b>14</b> and the second linking member <b>15</b> are disposed in the transmitting device, the wrench could use the first working member and the second member with normal sizes. And the total size of the wrench is still kept minimized after wrench composition. And the transmitting device can still keep best effects of linking and rotating.

0027Also, in order to enable the wrench to be adapted to more different narrow spaces, the first section <b>22</b> has two penetrating holes <b>221</b>, and the second section has two penetrating holes <b>231</b>. To be more precisely, the two penetrating holes <b>221</b> of the first section are respectively located on the top surface and the bottom surface of the first section. The two penetrating holes <b>231</b> of the second section are respectively located on the top surface and the bottom surface of the second section. As shown in <figref idref="DRAWINGS">FIG. 3</figref>, the first working member includes two heads <b>121</b>, and the two heads <b>121</b> are respectively located in one of the two penetrating holes <b>221</b>. The first working member includes two heads <b>131</b>, and the two heads <b>131</b> are respectively located in one of the two penetrating holes <b>231</b>. As such, users can choose two penetrating holes suitable to be adapted to the narrow spaces. Thus, the wrench of the present invention has more practicability.

0028However, some narrow constructing spaces have limitations on angle. Therefore, in the forth embodiment of the present invention, as shown in <figref idref="DRAWINGS">FIG. 8</figref> and <figref idref="DRAWINGS">FIG. 9</figref>, a structure of the forth embodiment is different form the first embodiment. The difference is that the top surface <b>244</b> of the middle section has one empty hole, and the bottom surface of the middle surface has another empty hole. The rotor includes two heads <b>113</b>, and the linking member is disposed in the middle section. The two heads <b>113</b> of the rotor are respectively located in one of the two empty holes. In other words, the rotor can keep not only a characteristic of a middle linking component that drives the first working member and the second member to rotate, but also effects of the working members. When the first working member and the second working member can not be used for disassembling a screw by a tool because of the angle limitations, the tool can be inserted in the head of the rotor to disassemble the screw. Therefore, problems caused by the angle limitations can be improved.

0029What is worthy mentioning is that the heads of the first working member, the second working member, or the rotor can respectively rotate more smoothly with a bearing <b>3</b>. The bearing <b>3</b> can be respectively disposed around the heads of the first working member, the second working member, or the rotor. The bearings can prevent the working members from wear and tear. As such, the disassembling efficiency and the lifetime of the present invention are further enhanced.