JP4683662B2 - Pull-out dishwasher - Google Patents

Description

  The present invention relates to a drawer-type dishwasher, and more particularly to a lid opening / closing operation mechanism, and there is packing on the lower surface of the lid, and the washing tub is opened and closed by opening and closing the washing tub so that the washing tub is opened and closed. The machine prevents the lid from being insufficiently tightened due to errors in the assembly position of the lid with respect to the cleaning tank, etc., and prevents it from becoming excessive, preventing lid seal failure and damage to the packing. Is something that can be done.

The washing tub is supported by the left and right rails of the dishwasher main body so that it can be freely inserted and removed, and the lid is supported by the side wall of the housing so that it can be moved up and down. Some of them are pressed against the upper edge of the cleaning tank so that the mating surfaces of the lid and the cleaning tank are sealed.
The lid is supported by four parallel links on the front, rear, left and right of the lid, and the lid is urged forward by a return spring (hereinafter referred to as “opening spring”) to push the cleaning tank. There are some which push down the cam roller with an inclined cam by operation and pull down the lid against the above-mentioned opening spring to close the lid (for example, Japanese Patent No. 3417353, Japanese Patent No. 3789775, Japanese Patent No. 3537759). .

  In addition, the parallel link that lifts and lowers the lid supported by the parallel link is L-shaped, a cam roller is provided at an intermediate portion thereof, the cam roller is pushed down by the inclined cam, and the opening spring (lid (The above-mentioned patent No. 3537759, hereinafter referred to as “prior art”). This is shown in FIG. 8 and FIG. 9, and the washing tub 12 is moved in the front-rear direction (left and right in the figure) by the rail 11 on the inner surface of the dishwasher body or casing (hereinafter referred to as “casing”) 10. Direction). When the cleaning tank 12 is pushed into and stored in the housing 10, the front end opening of the housing 10 is closed by the front door 13.

A lid 14 is provided above the cleaning tank 12, and the lid 14 is connected to the side wall 17 of the housing 10 by parallel links 15 on the front left and right and parallel links 16 on the left and right. It is pulled forward.
There are inclined cams 20 on the front, rear, left and right of the side wall of the cleaning tank 12, and cam rollers 25 for the inclined cams are provided in the intermediate portions of the parallel links 15 and 16. The parallel link 16 has a lower end connected to the side wall 17 of the housing 10 by a connecting pin 16a and an upper end connected to the side end of the lid body 14 by a connecting pin 16b.
Since the parallel link 15 is the same as the parallel link 16, the parallel link 16 will be described below.

When the cleaning tank 12 is pushed in, near the end of the pushing operation, the inclined cam 20 comes into contact with the cam roller 25, pushes down the cam roller 25, and the left and right parallel links 16 are moved backward ( Rotate clockwise to pull down the lid diagonally downward (FIG. 9c). The entire lid 14 is pulled down by the front, rear, left and right parallel links 15, 16 to contact and close the opening of the cleaning tank 12, and the opening of the cleaning tank 12 is sealed by packing on the lower surface. Then, the cam roller 25 is pressed by the horizontal lower surface of the inclined cam, and the closed state is maintained.
The descending stroke of the cam roller and the lid 14 by the inclined cam 20 depends on the vertical positional relationship of the cam roller 25 with respect to the inclined cam surface 20a of the inclined cam 20, and the tightening force for the packing is the descending stroke of the lid 14 Depends on the size of the.

  On the other hand, when the washing tank 12 is pulled out, the cam roller 25 is not pressed by the inclined cam 20, so that the lid body 14 is pulled forward by the opening spring 18 and pushed upward and obliquely upward by the parallel links 15 and 16. The cleaning tank is opened.

By the way, in the case where the lid is pulled down by the inclined cam by the pushing operation of the cleaning tank and the lid is closed, the cam height of the inclined cam (the height of the inclined surface) is set so that the cam roller is pushed down by the required stroke. If the cam stroke s is excessive and the tightening force on the lid is excessive, the packing is damaged and the operation of inserting and removing the cleaning tank is hindered. Therefore, the cam height h of the inclined cam is increased more than necessary. It is not possible. Incidentally, the compression amount with respect to the packing is, for example, approximately 2 mm and extremely small, and the allowable range is only about ± 1 mm at the maximum.
On the other hand, the relative positional relationship in the vertical direction (height direction) between the tilt cam and the cam roller in an actual drawer-type dishwasher depends on the deformation of the cleaning tank and the main body, the assembly error of the tilt cam to the cleaning tank, etc. As a result, a displacement r occurs, and the push-down stroke s1 of the cam roller 25 by the inclined cam changes drastically, whereby the tightening force on the lid changes significantly (see FIG. 10).

Insufficient tightening force on the lid due to deformation of the washing tank, tilt cam assembly, etc. results in poor sealing and water leakage, and excessive tightening force damages the packing early. As a result, a seal failure occurs and water leaks. In addition, when the tightening force on the lid is excessive, the packing is damaged early due to excessive tightening, and there is a problem that the resistance against the pushing operation of the cleaning tank increases accordingly.
Japanese Patent No. 3417353 Japanese Patent No. 3789775 Japanese Patent No. 3537759

This invention is Yes by vertically movably supporting the lid to the housing in a parallel link and fro, by a cam roller which is provided at an intermediate portion of the inclined cam parallel link provided the lid before and after the right and left of the cleaning tank Assuming a drawer-type dishwasher that closes the lid, the assembly error of the lid to the housing, the assembly error of the tilt cam to the cleaning tank, the assembly error of the cam roller to the lid, the assembly error of the cleaning tank to the housing, etc. In order to prevent the tightening force on the lid from becoming too small or too large, regardless of the various assembly errors (hereinafter referred to as "assembly errors of the tilt cam mechanism, etc.") By reducing fluctuations (increase and decrease) in the tightening force on the lid due to errors in the lid, the required tightening force is secured on the lid, and excessive tightening As the force is not applied, it is an its object to devise an inclined cam mechanism by the tilting cam and parallel link and the cam roller.

The means for solving the above-mentioned problem is that the lid is supported by the casing by front / rear / right / left parallel links so as to be movable up and down, and is provided at an intermediate portion between the inclined cams provided at the front / rear and left / right of the cleaning tank and the parallel links. The following (a) to (d) are based on the premise of a drawer-type dishwasher in which the lid is pulled down and closed against the opening spring by a cam roller.
(B) There is a longitudinal slot in the middle of the parallel link,
(B) The roller shaft of the cam roller is supported in the vertical elongated hole so as to freely move up and down, and a cam tension spring is interposed between the roller shaft and the lid to urge the cam roller upward. And
(C) When the cleaning tank is pushed into the housing , the cam roller is pushed down by the pressing force against the cam roller by the inclined cam, and the lid is pulled down via the cam tension spring.
(D) The cam tension spring has a spring force for pulling down the lid with a required strength.

[Action]
The cam roller is supported by the vertical elongated hole so as to move up and down within a predetermined range with respect to the parallel link, and the shaft of the cam roller and the lid are connected by a cam tension spring and biased upward. Has been. In the free state, the cam roller is pulled up to the upper end position of the longitudinal slot by the cam tension spring. When the cam roller is pushed down by a predetermined stroke from the above-described free state by the inclined cam, the cam tension spring is extended, and the lid is pulled down via the tension spring. The spring force (or spring load) of the cam tension spring is set so that the pulling force on the lid at this time becomes a required tightening force on the lid.

Since the inclined cam has a sufficient cam height, even if the cam roller push-down stroke s1 (see FIG. 10) is smaller than the design value due to an assembling error of the inclined cam mechanism or the like, it is minimal. Necessary cam push-down stroke is ensured. Therefore, the cam tension spring generates the required spring force (so that the spring characteristics can be set), and the lid is tightened with the required tightening force. Therefore, the leakage of water due to a defective seal due to insufficient tightening force. Will not cause.
On the other hand, even if the cam roller's push-down stroke is larger than the design value due to an assembly error of the tilt cam mechanism, etc., the spring force (spring load, the same applies hereinafter) of the cam tension spring will not be too great (as in the cam Since the spring characteristics of the tension spring can be easily set), the lid body is not tightened with an excessive force.

  Note that if the cam tension spring is used as a close contact coil spring and a preload is applied, a large spring force can be exerted with a small extension, and by reducing the spring coefficient, it can be caused by an assembly error such as an inclined cam mechanism. The increase portion of the tightening force with respect to the lid body due to the increase of the pressing stroke of the cam roller can be reduced, and the tightening force with respect to the lid body can be stabilized.

  When the inclined cam contacts the cam roller, the cam roller is pushed down, and the lid is pulled down via the cam tension spring. At this time, since the resistance by the opening spring is considerably smaller than the preload by the cam tension spring, the lid is easily pulled down against the opening spring. And since packing p (refer FIG. 1) contact | abuts to a washing tank and is compressed, the pulling-down resistance of a cover body increases. When the pulling resistance against the lid exceeds the preload of the cam tension spring, the cam roller is pulled down while extending the cam tension spring. When the cam roller is pushed down, the cam tension spring extends to increase the spring load (spring force), and the tightening force to the lid increases. Then, by appropriately selecting the strength of the cam tension spring, the increment of the spring force due to the increase in the elongation is suppressed to an appropriate range.

  As described above, the minimum necessary clamping force for the lid is ensured by the preload of the cam tension spring, and the upper limit is appropriately suppressed by appropriately selecting the strength of the spring. Regardless of the assembly error of the tilt cam mechanism or the like, there is no shortage of the tightening force with respect to the lid, and it is surely tightened with the required tightening force and is limited so as not to become excessive.

The intermediate portion of the parallel link is a substantially intermediate portion in the longitudinal direction, and the “longitudinal elongated hole” means an elongated hole in the substantially vertical direction in the closed state, which cams the cam roller. Since it is a long hole that smoothly guides in the vertical direction against the tension spring, there is no problem even if it is somewhat inclined.
Furthermore, if the parallel link is L-shaped, a longitudinal slot can be formed at the corner, which is advantageous in terms of structure. Therefore, the parallel link is preferably L-shaped.

The washing tank is supported by the rail so that it can be inserted and removed freely, and a lid with packing on the lower surface is supported by the casing so that it can be moved up and down by front and rear, left and right parallel links. For a drawer-type dishwasher that is designed to close the lid by lowering the lid against the opening spring by a cam and cam roller, the cam roller is connected to the lid via a cam tension spring. Thus, it is possible to prevent the tightening force on the lid from being insufficient due to an assembly error of the inclined cam mechanism or the like, and it is possible to prevent the tightening force from becoming excessive.
That is, the tightening force on the lid by the tilt cam and cam roller is almost specified by the preload of the cam tension spring, and the increase or decrease in the tightening force due to the increase or decrease in the cam stroke is small. Can be high. Therefore, even if the cam stroke is reduced due to an assembling error of the inclined cam mechanism or the like, the tightening force with respect to the lid body is insufficient and a sealing failure does not occur. Conversely, even if the cam stroke is increased, the tightening force is not excessive and the packing is not damaged.

Next, embodiments will be described with reference to the drawings (FIGS. 1 to 7).
The overall configuration of the dishwasher is no different from the prior art (FIG. 8).
In this embodiment, the parallel links 15 and 16 supporting the lid body 14 are L-shaped links, one end (lower end) of which is connected to the side wall of the housing 10 by a connecting pin 16a, and the other end (upper end) is connected. The pin 16b is connected to the bracket 14b of the lid 14.
Longitudinal elongated holes 35 are provided at the corners of the parallel links 16, and the shafts of the cam rollers 25 (hereinafter referred to as “roller shafts”) 30 are fitted into the elongated longitudinal holes 35. The hole 35 is held so as to be movable up and down.

  The roller shaft 30 protrudes outward from the parallel link 16, and the connecting pin 16b protrudes outside the parallel link 16. The cam shaft is protruded from the protruding portion of the roller shaft 30 and the protruding portion of the connecting pin 16b. The lower end and the upper end of the tension spring 40 are locked, and the cam roller 25 is pulled upward by this. The cam tension spring 40 is a close-contact coil spring having an initial tension of 0.7 kgf, a spring coefficient of about 0.075 kgf / mm, and a preload of 1 kgf (see FIG. 7). In a state where the cleaning tank is pulled out and opened (the state shown in FIG. 3), the roller shaft 30 is lifted by the above preload and is in contact with the upper end of the longitudinal slot 35.

The cam height h (see FIG. 10) of the cam surface 20a of the inclined cam 20 is set to 11 mm in anticipation of a reduction in the cam roller pressing stroke s1 (see FIG. 10) due to an assembly error of the inclined cam mechanism or the like. (In this example, it is 2 mm higher than the cam height required for the lid closing operation).
When the cleaning tank 12 is pushed into the housing 10 and the cam surface 20a of the inclined cam 20 comes into contact with the cam roller 25 (FIG. 4), the cam roller 25 is pushed downward, and the parallel links 15 and 16 connect the connecting pin 16a. It is rotated backward (clockwise) as a support shaft, and the lid body 14 is pulled down against the lid opening spring 18 (FIG. 5). When the packing p on the lower surface of the lid abuts against the opening edge of the cleaning tank 12, the packing p is compressed (in this example, it is planned to be compressed at a maximum of approximately 2 mm). The resistance against pulling down of the lid by 16 increases, and this resistance exceeds the preload of the tension spring for the cam. Until the resistance exceeds the preload of the cam tension spring, the cam tension spring 40 does not expand. Therefore, the roller shaft 30 remains in contact with the upper end of the longitudinal slot 35 and the cam roller 25 and the parallel links 15 and 16 are lowered integrally.

When the resistance against pulling down of the lid 14 exceeds the preload of the cam tension spring, the cam tension spring gradually expands, and the roller shaft 30 moves downward away from the upper end of the longitudinal slot 35. In this state, the clamping force on the lid is equal to the spring force of the cam tension spring. Since the preload of the cam tension spring is 1 kgf and the spring coefficient is about 0.075 kgf / mm, if the roller shaft 30 moves down 3 mm along the longitudinal slot 35, The spring force of the cam tension spring is about 1.225 kgf.
When the cleaning tank is pushed in, the cam roller 25 is finally pushed down on the horizontal lower surface of the inclined cam, and the lid body 14 is held in the closed position (FIG. 6).

In this embodiment, due to an assembly error of the inclined cam mechanism and the like, the spring force of the cam tension spring when the extension of the cam tension spring is small and extended up to 2 mm, and the extension is large and extended up to 4 mm. The difference in the spring force at this time is 0.15 kgf, and the difference in the clamping force on the lid during this time is relatively small with respect to the preload 1 kgf or the final spring force (final spring load) 1.6 kgf.
When the cleaning tank is pulled out, the state shown in FIG. 6 is changed to the state shown in FIG. 3 (opened state) through the state shown in FIG. 5 and the state shown in FIG.

It is a fragmentary section side view of the embodiment Is a cross-sectional view of the main part of FIG. Is a cross-sectional view taken along line AA in FIG. Is an explanatory diagram of the pushing operation of the cleaning tank Is another explanatory view of the pushing operation of the cleaning tank Is another explanatory diagram of the pushing operation of the cleaning tank Is an explanatory view showing a closed state of the cleaning tank Is an explanatory view showing the characteristics of the tension spring for the cam Is a sectional view of the prior art Is a diagram depicting the closing operation of the prior art Is a reference diagram for explaining the problems of the prior art

Explanation of symbols

10: Housing 12: Cleaning tank 14: Lid 14b: Bracket 15, 16: Parallel links 16a, 16b: Connecting pin 20: Inclined cam 20a: Inclined cam surface 25: Cam roller 30: Roller shaft 35: Longitudinal elongated hole 40: Cam tension spring h: Cam height s: Cam stroke s1: Cam roller push-down stroke r: Position shift due to assembly error

Claims (3)

The lid has vertically movably supported by the casing, Ri by the cam roller provided on an intermediate portion of the inclined cam and the parallel link provided on the front, rear, left and right of the cleaning tank, the lid opening spring before and after the right and left parallel link In a pull-out dishwasher that pulls down the lid against this and closes it,
There is a longitudinal slot in the middle of the parallel link,
Roller shaft of the cam roller to said longitudinal slot is vertically movably supported, also, by spring tension cam is interposed between the roller shaft and the lid to bias the cam roller upwards And
When the cleaning tank is pushed into the housing, 該Ka Murora is pushed down by the pressing force against the cam roller by the inclined cam is configured so that the lid is pulled through the spring tension for the cam,
Spring tensioning the cam, drawer-type dishwasher, characterized in that those having a spring force to lower the lid with the required strength. 2. The drawer type dishwasher according to claim 1, wherein the tension spring for the cam is a close-contact coil spring, and an initial tension is applied.   The drawer type dishwasher according to claim 1, wherein the parallel link is an L-shaped link.

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