JP2006002897A - Structure of mounting component - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide structure of mounting components for which efficiency of screw locked working and safety of an operator are enhanced. <P>SOLUTION: The structure of mounting the components installs a locked component A on a lock boss 1. The structure also inserts through a tapping screw 2 into attached hole 5 of the locked component A and at the same time mounts the locked component A on the lock boss 1 by threadably engaging the tapping screw 2 into a prepared hole 3 of a screw of the lock boss 1. In the structure, it provides a counterbore 6 of inner diameter larger than outer diameter d of thread of the tapping screw 2 on opening side of the prepared hole 3 of the screw which threadably engages the tapping screw 2 of the lock boss 1. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a structure in which a component is attached to a fastening boss of a casing of a device with a tapping screw.

  Conventionally, when a component is attached to a casing of a device, it is often performed using a tapping screw (see, for example, Patent Document 1).

For example, when a part is attached to a fixing boss 1 of a casing formed of a material such as a synthetic resin, a screw pilot hole 3 having a diameter smaller than the outer diameter of the tapping screw 2 is attached to the fixing boss 1 as shown in FIG. If necessary, a chamfer 4 is provided at the opening edge of the screw lower hole 3 so that the screw tip of the tapping screw 2 can easily enter the screw lower hole 3, and the screw is fixed on the fixing boss 1. The attachment component is placed, and the tapping screw 2 is screwed into the screw lower hole 3 and tightened through the attachment hole of the component to be secured, and the component to be secured is attached to the fastening boss 1.
Japanese Patent Publication No.46-25205

  However, in the case of the work of fastening a plurality of parts to be fastened together, the mounting holes of all parts are matched with the screw lower holes 3 of the fastening bosses 1 and the tips of the tapping screws 2 are matched with the screw lower holes 3. Screwing work is performed, but there are the following problems.

  (1) Taking up a screwing tool such as a driver while keeping the direction of several parts and the tapping screw 2 with one hand is complicated and difficult even for a skilled person.

  (2) When the component or the tapping screw 2 is small, the fingertip holding the component or the tapping screw 2 is close to the threaded portion, and there is a possibility of being injured by a screw thread or a screwing tool during the operation.

  The present invention was invented in view of the above-described conventional problems, and an object of the present invention is to provide a component mounting structure that improves the efficiency of screwing work and the safety of workers.

  In order to solve the above-mentioned problems, the component mounting structure of the present invention is such that the component A to be secured is placed on the retaining boss 1 and the tapping screw 2 is inserted into the attachment hole 5 of the component A to be secured. 2 is screwed into the screw lower hole 3 of the fixing boss 1, and the screw lower hole 3 for screwing the tapping screw 2 of the fixing boss 1 into the fixing boss 1 is fixed. A counterbore hole 6 having an inner diameter larger than the screw outer diameter d of the tapping screw is provided on the opening side.

  With this configuration, the part A to be secured is placed on the fastening boss 1 so that the screw lower hole 3 and the attachment hole 5 correspond to each other, and the tip of the tapping screw 2 is counterbored from the attachment hole 5. 6, the part A to be fastened is temporarily held on the tapping screw 2, and in this state, the tapping screw 2 can be tightened with a screwing tool to be screwed. As a result, the screwing operation can be performed easily and efficiently, and it is not necessary to place the fingertip near the threaded portion, thereby improving the safety of the operator.

  Further, the internal diameter of the counterbore 6 is about 1.1 times the screw outer diameter d of the tapping screw 2, and the depth H of the counterbore 6 is 1.0 to 2.0 times the screw outer diameter d. It is also preferred to have a feature. When the tip of the tapping screw 2 is inserted into the counterbore 6, the tapping screw 2 can be stably raised and temporarily held.

  It is also preferable that a chamfer 7 is provided at the bottom of the counterbore 6 to guide the tip of the tapping screw 2 to the screw hole 3. In this case, when the tip of the tapping screw 2 is inserted into the counterbore 6 and temporarily held, and the tip of the tapping screw 2 is screwed into the screw lower hole 3, it is guided by the chamfer 7 and can be screwed smoothly. Stopping work becomes easier.

  Since the present invention is configured as described above, the component to be secured is placed on the retaining boss so that the screw lower hole and the attachment hole correspond to each other, and the tip of the tapping screw is changed from the attachment hole to the counterbore. The part to be secured is temporarily held on the tapping screw, and in this state, the tapping screw can be tightened with a screwing tool and screwed, which improves the efficiency of the screwing work and the safety of the worker. There is an effect.

  Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings.

  The device is, for example, a warm water washing toilet seat, and the casing 8 serving as the outer shell of the device is formed of synthetic resin. As shown in FIG. 1, the casing 8 is provided with a fastening boss 1, and the fastening boss 1 is provided with a screw lower hole 3 for screwing the tapping screw 2. The inner diameter of the screw hole 3 is slightly smaller than the outer diameter d of the tapping screw 2. When the screw lower hole 3 is provided in the fastening boss 1, a counterbore hole 6 having an inner diameter larger than the outer diameter d of the screw is provided on the opening side on which the tapping screw 2 is inserted as shown in FIG. The counterbore 6 has an inner diameter of about 1.1 times the screw outer diameter d, and a depth H of the counterbore 6 is about 1.0 to 2.0 times the screw outer diameter d, preferably 1 About 5 times.

  In this example, there are two parts to be fixed A to be attached to the fixing boss 1, one of the parts A to be fixed is a grounding metal 9 and the other part A to be fixed is an earth wire 10. . The earthing piece 9 is formed in a substantially inverted L shape with a horizontal piece 9a and a vertical piece 9b. A mounting hole 5 is drilled in the horizontal piece 9a, and a set screw 11 is screwed into the vertical piece 9b. is there. A terminal portion 10a is provided at the end of the ground wire 10, and a mounting hole 5 is drilled in the terminal portion 10a.

  The attachment of the grounding metal 9 and the grounding wire 10 as the parts A to be secured is performed as follows. The horizontal piece 9a of the grounding metal 9 and the terminal portion 10a of the grounding wire 10 are placed on the fastening boss 1, the mounting hole 5 and the screw lower hole 3 are matched, and the tip of the tapping screw 2 is attached from the mounting hole 5. 2 is inserted into the counterbore 6 as shown in FIG. 2, and the tapping screw 2 is temporarily held in the counterbore 6, and the grounding metal 9 and the ground wire 10 are temporarily held in the tapping screw 2. From this state, the tapping screw 2 is screwed into the screw lower hole 3 with a screwing tool such as a screwdriver, the tapping screw 2 is tightened, and the grounding metal 9 and the grounding wire 10 are attached to the fastening boss 1. When attaching the grounding fixture 9 and the grounding wire 10 as the part to be secured A with the tapping screw 2, the tip of the tapping screw 2 can be inserted into the counterbore 6 and temporarily held, so that the screwing operation is simple and efficient. It is possible to improve the safety of the operator because it is not necessary to place the fingertip near the screw portion.

  When the tip end of the tapping screw 2 is inserted into the counterbore 6 and temporarily held as described above, the inner diameter of the counterbore 6 is about 1.1 times the screw outer diameter d, and the depth H is the screw outer diameter d. If it is 1.0 to 2.0 times as large as that, the tapping screw 2 can be temporarily held so as not to fall, and in particular, if the depth H is 1.5 times the screw outer diameter d, it is shown in FIG. As described above, the inclination of the tapping screw 2 can be held so as to be 10 ° or less. That is, as shown in FIG. 4B, when the depth H of the counterbore 6 is the same as the screw outer diameter d, the tapping screw 2 is tilted by 20 ° or more, and the screwing tool is a cross hole (or a screw head) If the depth H of the counterbore 6 is 0.7 times or less of the outer diameter of the screw, the tapping screw 2 can be removed as shown in FIG. 4 (c). Although it cannot fall and cannot be temporarily held, if it can be held at an inclination of 10 ° or less as shown in FIG. 4A, such an adverse effect is eliminated, and screwing can be performed smoothly and reliably. Further, as the depth H of the counterbore 6 is deeper, the tapping screw 2 is not inclined. However, in order to secure a portion for fastening the tapping screw 2, the total length of the tapping screw 2 is increased, and a processed portion of the screw lower hole 3 is also formed. Since it is necessary to make it longer, there is a possibility that the economy and the degree of freedom of design may be impaired. From these viewpoints, the depth H of the counterbore 6 is optimally 2.0 or less, preferably about 1.5 times the screw outer diameter d.

  In the example of FIG. 5, a chamfer 7 is provided at the bottom of the counterbore 6 to guide the insertion of the tip of the tapping screw 2 into the screw lower hole 3. In this way, the chamfer 7 can guide the screwing of the tip of the tapping screw 2 into the screw lower hole 3 from the state in which the tapping screw 2 is temporarily held in the counterbore hole 6, thereby further facilitating the screwing operation. it can.

It is an exploded perspective view of an example of an embodiment of the invention. It is sectional drawing which shows the state temporarily fixed when attaching components same as the above. It is sectional drawing explaining the dimensional relationship of a tapping screw same as the above and a counterbore hole. (A) (b) (c) is sectional drawing explaining the temporary fix | stop of a tapping screw same as the above. It is sectional drawing explaining the structure of the other example same as the above. It is sectional drawing explaining a prior art example.

Explanation of symbols

A Fastened parts
DESCRIPTION OF SYMBOLS 1 Stop boss 2 Tapping screw 3 Screw hole 5 Mounting hole 6 Counterbore hole 7 Chamfer

Claims (3)

Place the component to be secured on the fixing boss, insert the tapping screw into the mounting hole of the component to be secured, and secure the component to be secured by screwing the tapping screw into the screw lower hole of the boss. In the mounting structure of a component to be attached to the mounting structure, a counterbore hole having an inner diameter larger than the outer diameter of the tapping screw is provided on the opening side of the screw lower hole into which the tapping screw of the fixing boss is screwed. . 2. An internal diameter of the counterbore hole is about 1.1 times the screw outer diameter of the tapping screw, and a depth of the counterbore hole is 1.0 to 2.0 times the screw outer diameter. Mounting structure of parts. 3. The component mounting structure according to claim 1, wherein a chamfer for guiding the tip of the tapping screw to the screw hole is provided at the bottom of the counterbore.

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