JPS6321259Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention relates to a mounting structure for a handle body in a sewing machine. In the upper lid, by improving the mounting structure of the handle body provided on the upper lid, the upper lid can be easily injection molded using a normal split mold without using a special mold, The present invention relates to a new mounting structure that reduces the number of steps and manufacturing costs.

PRIOR ART As a recent trend in household sewing machines, models in which a handle body is rotatably attached to the top cover of the sewing machine have become popular for convenient portability. This upper cover is a cover body that covers the upper open part of the sewing machine frame, and is conventionally manufactured from a cast product such as aluminum die casting, so although it has sufficient strength, it is heavy and has the disadvantage of increasing manufacturing costs. be. For this reason, attempts have been made to convert the upper cover into an injection molded product made of synthetic resin, with the aim of reducing the overall weight of the sewing machine and the manufacturing cost, and some of these have already been commercialized.

Problems to be Solved by the Invention However, if the upper lid made of synthetic resin is manufactured by injection molding, a handle body is attached to the upper lid in order to facilitate carrying the sewing machine.
The injection mold had the following drawbacks from the viewpoint of its structure and mounting strength. In other words, in order to insert and rotatably attach the legs of the handle body to the top cover of the sewing machine, a through hole for inserting the mounting shaft must generally be bored in, for example, a protrusion formed on the back side of the top cover. be. However, when molding the top cover by injecting synthetic resin into split molds, in order to simultaneously mold the through hole on the protruding piece on the back of the top cover, it is necessary to use a core mold in addition to the pair of split molds. It is necessary to use auxiliary jigs such as auxiliary jigs such as auxiliary jigs, which makes the mold structure extremely complicated and increases the number of steps. Therefore, instead of simultaneously forming the through hole in the protruding piece during injection molding, attempts have been made to drill the through hole in the protruding piece of the synthetic resin top cover in a separate process after injection molding. However, this also increases the number of steps required for processing, and is not a fundamental solution. Therefore, we gave up on drilling a mounting hole for the mounting shaft in the top cover, and instead created a structure in which an open groove is formed in the protrusion that allows injection molding using a split mold, and the mounting shaft of the handle body is loaded into the open groove. It has also been proposed to bridge the open end of the projecting piece with a metal piece, and then screw and fix this metal piece with a tapping screw. However, even if the top lid is made of synthetic resin, a sufficient screw tightening effect cannot be obtained even if the top cover is made of synthetic resin.
Additionally, if a downward load is applied to the upright handle body (often people accidentally push it downward when handling it), the screw hole in the protrusion collapses and the handle body cannot withstand this load. The mounting strength was also unsatisfactory, with the mounting shaft sometimes falling off.

Purpose of the invention The present invention was proposed in order to effectively solve the above-mentioned problems.When injection molding a sewing machine top cover with a structure in which the handle body is rotatably attached, from synthetic resin, The purpose is to reduce the number of steps and manufacturing costs by creating a structure that does not require a complicated mold structure and can withstand sufficient strength even when a vertical load is applied to the handle body from above.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a method for attaching the handle body to the top cover in a synthetic resin sewing machine top cover in which the handle body is attached so as to be able to rise and fall freely. A mounting hole through which the shaft can be inserted is formed at the tip of each leg of the handle body, and a circular engagement surface, for example, which is co-centered with the mounting hole, is formed at the tip of each leg of the handle body. , a hanging part is bored at a position adjacent to the opening on the back surface of the upper lid, and a receiving surface, for example, an arcuate shape that can be fitted into the engaging surface from below, is formed on a side surface of the hanging part, and the engaging part A notch is bored in the hanging part, the upper peripheral edge of which matches the peripheral edge of the mounting hole when the surface and the receiving surface are fitted, and the lower part of which is open.

This structure eliminates the need to form a through hole in the handle attachment part on the back side of the top lid of the sewing machine, making it possible to use ordinary dividing molds without having to use auxiliary jigs such as complex core molds. It becomes possible to manufacture a synthetic resin top cover by injection molding using a mold, reducing the number of steps and manufacturing cost. In addition, since the handle body has a structure that can sufficiently withstand vertical loads applied to the handle body, the handle body can be firmly attached.

Embodiments Next, the mounting structure of the handle body in the sewing machine according to the present invention will be described in detail below using preferred embodiments with reference to the accompanying drawings. Fig. 1 is a perspective view showing a top cover with a handle body attached to the upper open part of the sewing machine frame, and Fig. 2 is a perspective view showing the handle body mounting structure according to the present invention diagonally upward from the back side of the sewing machine top cover. The exploded view shown in FIG. 3 is a plan view showing the back side of the upper cover of the sewing machine.

In FIG. 1, a sewing machine frame 10 in the sewing machine main body has a sewing machine arm 12 extending in the horizontal direction, and the upper open part of this sewing machine arm 12 is removably covered by a top cover 14. There is. The upper lid 14 is an injection molded product made of, for example, thermoplastic synthetic resin with excellent weather resistance, and a handle body 16 is provided at the top of the upper lid so that it can be freely rotated to stand up and fall down for convenient portability of the sewing machine. installed. That is, the handle body 1
6 is a handle portion 18 that extends along the longitudinal direction of the sewing machine arm 12 when attached to the upper lid 14;
The handle part 18 is composed of a pair of legs 20, 20 formed to be bent at right angles at both ends thereof, and is integrally molded from a synthetic resin such as hard nylon. The handle body 16 is rotatably supported by a mounting mechanism, which will be described later, by having the tips of its legs 20 fitted into openings 22 formed at required locations in the upper lid 14.

As can be seen from FIG. 2, the handle body 1
A mounting hole 24 is provided at the tip of each leg 20 of 6.
are formed parallel to the extending direction of the handle portion 18, and these mounting holes 24 are provided with mounting shafts 26 for mounting the handle body 16 on the upper lid 14, as described later.
It is designed so that it can be inserted tightly. Further, both side surfaces of the tip of each leg portion 20 in the handle body 16 are made thick, and a protruding step portion 30 is formed on one side surface thereof, that is, the side surface facing outward of the leg portion 20 as shown in the figure. An arcuate engagement surface 28 whose center coincides with the attachment hole 24 is formed on the side surface of the protruding step portion 30 . That is, as shown in FIGS. 5 and 6, the engaging surface 28 is recessed inward of the protruding step 30, has a common center with the mounting hole 24, and has a common center with the leg portion. It is set to open at the tip side. Note that the engagement surface 28 may be formed to have a circular shape other than the illustrated arc shape. Further, at the open end of the leg portion 20 of the handle body 16, a required arcuate surface 32 is formed, as clearly seen from FIGS. 2 and 6, and one terminal end of this arcuate surface 32 is formed. Kara tongue piece 34
is formed protrudingly. The circular arc surface 32 is a fourth
As shown in the figure, when the handle body 16 is rotated in the direction of collapse with respect to the upper lid 14, it functions to allow smooth rotation. Further, when the handle body 16 is stood up with respect to the upper lid 14 as shown in FIG. It functions as a kind of stopper.

As shown in FIG. 2, on the back surface of the upper lid 14, a corresponding part formed by molding the leg storage recess 36 protrudes, and this leg storage recess 36
A hanging portion 38 is integrally formed in a protruding manner at a position adjacent to the opening 22 and adjacent to the opening 22 . Further, on the side surface of the hanging portion 38 facing the opening 22,
A protruding step portion 40 of a required thickness is formed (FIG. 3),
An arc-shaped receiving surface 42 is formed on this protruding step portion 40, and when the handle body 16 is attached to the upper lid 14, this receiving surface 42 is formed on the engaging surface 28 provided on the leg portion 20.
can be fitted from below. The receiving surface 42 is connected to the engaging surface 28 when the handle body 16 is stood upright with respect to the upper lid 14 as shown in FIG.
supports the handle body 16, and the handle body 16 passes through the opening 22 to the sewing machine frame 1.
It functions to prevent falling into the air.

As shown in FIG. 2, FIG. 4, and FIG. When the engaging surface 28 is fitted into the receiving surface 42, the upper peripheral edge 46 of the notch 44
is set to match the peripheral edge of the mounting hole 24. Further, the lower part of the notch 44 is designed to be freely opened as shown by reference numeral 48 in FIG.

In addition, as shown in FIGS. 2 and 3, the upper lid 14
A locking piece 50 is integrally protruded at a required position on the back surface, and the handle body 1 is inserted through the openings 22, 22.
When the legs 20, 20 of No. 6 are inserted, the position of one open end of the mounting shaft 26, which is commonly inserted into the mounting holes 24, 24, is regulated by the locking piece 50. (The mounting shaft 26 is shown in Figure 3.)
(indicate with an imaginary line). Further, an annular groove 52 is provided around one end of the mounting shaft 26, and an E-ring 54 is elastically fitted into the annular groove 52 after the mounting shaft 26 is inserted into the mounting holes 24, 24. This completes the attachment of the handle body 16.

Since the handle body mounting structure according to the present invention is constructed as described above, as shown in FIG. If the handle body 16 is pushed down as it is, the leg portion 20 will pass through the opening 22, and the engaging surface 28 will fit into the receiving surface 42 formed on the hanging portion 38, as shown in FIG. At this time, the upper peripheral edge portion 46 of the cutout portion 44 in the hanging portion 38 is connected to the mounting hole 24 formed in the leg portion 20.
As described above, the dimensions are set to match the peripheral edge of the mounting hole 24,
The handle body 16 is rotatably attached to the upper lid 14 by commonly inserting the attachment shaft 26 into the upper cover 24 . Note that if this continues, the connection between the handle body 16 and the top cover 14 will be released when the mounting shaft 26 moves in the axial direction, so as described above, due to the cooperation of the engagement piece 50 and the E-ring 54, This is designed to prevent the mounting shaft 26 from falling off.

Note that when the engagement surface 28 provided on the leg portion 20 of the handle body 16 is formed in a circular shape, the engagement surface 2
The shape of the receiving surface 42 which is abutted and fitted with 8 is set to be an arcuate shape.

Effect As described above, in the present invention, when the leg portion 20 of the handle body 16 is inserted into the upper lid 14 through the opening 22, the leg portion 20 and the upper lid 14 are connected to each other via the mounting shaft 26.
Since the notch 44 that connects the upper lid 14 is configured to open downward on the back side of the upper lid 14 (there is no need to form a through hole), when the upper lid 14 is injection molded from a synthetic resin material, the core There is no need to use special molds such as molds, and it is sufficient to use a simple split mold, so the number of steps and manufacturing costs can be kept low. In addition, since the handle body has a structure that can sufficiently withstand even if a vertical load is applied to the handle body, the handle body can be firmly attached.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention,
Fig. 1 is a perspective view showing the external appearance of a sewing machine in which a top cover with a handle body is attached to the upper open part of the sewing machine frame, and Fig. 2 is a perspective view showing the handle body mounting structure according to the present invention diagonally upward from the back side of the sewing machine top cover. Figure 3 is a plan view showing the back side of the sewing machine top cover, Figures 4 and 5 are longitudinal cross-sectional views showing the fitted state of the handle body and top cover, respectively, and Figure 6 is a view of the handle body. It is a longitudinal cross-sectional view showing a state immediately before being attached to the upper lid. 10...Sewing machine frame, 12...Sewing machine arm, 14...Top lid, 16...Handle body, 18...
...handle, 20...leg, 22...opening, 24...
...Mounting hole, 26...Mounting shaft, 28...Engaging surface, 3
8... hanging part, 42... receiving surface, 44... notch part,
46...Upper periphery.

Claims (1)

[Claims for Utility Model Registration] Upper cover 1 made of synthetic resin that covers the upper open part of the sewing machine frame 10 with the upper open part of the sewing machine arm 12
4, a handle body 16 made of synthetic resin and having a handle part 18 extending along the longitudinal direction of the sewing machine arm 12 and a pair of leg parts 20 continuously formed at both ends of the handle part 18. A mounting shaft for attaching the handle body 16 to the upper cover 14 in a sewing machine in which the tip of each leg 20 of the handle body 16 faces an opening 22 formed in the upper cover 14 and is rotatably attached to the upper cover 14. A mounting hole 24 through which a screw 26 can be inserted is formed at the tip of each leg 20 of the handle body 16, and a circular or arcuate engagement surface 28 coaxial with the mounting hole 24 is formed in each leg 20 of the handle body 16. A hanging part 38 is formed on the tip end side of the leg part 20 and is bored at a position adjacent to the opening 22 on the back surface of the upper cover 14 to prevent the handle body 16 from falling into the sewing machine frame 10 through the opening 22. In order to prevent this, an arcuate or circular receiving surface 42 that can be fitted into the engaging surface 28 from below is formed on the side surface of the hanging portion 38, and when the engaging surface 28 and the receiving surface 42 are fitted together, Attachment of a handle body to a sewing machine, characterized in that a notch 44 is formed in the hanging part 38 so that an upper peripheral edge 46 facing the opening 22 matches the peripheral edge of the attachment hole 24 and is open downward. structure.