JP3491399B2 - Balance with draft shield - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a windshield balance capable of accurately measuring the mass of various samples. More specifically, both side plates and the top plate are light and smooth at the same time both manually and automatically. The present invention relates to a windshield balance that can be opened and closed.

[0002]

2. Description of the Related Art As a balance for precisely measuring the mass of powder and various other samples, a windshield balance is used, which is a cubic windshield case with a sample weighing unit installed. Many. In such a balance with a windshield, both or one of the side plates on both sides is used as a door, and in some cases, the top plate is used as a door to open and close independently, or one equipped with a device for attaching and detaching the door is provided on the left and right doors and the upper surface. There are various types such as a structure in which the doors can be operated independently or simultaneously. In many cases, the sliding surfaces are such that the upper and lower end surfaces of the side plate are slid into grooves provided on the edges of the top plate or the bottom plate, or the top plate itself is slid.

Some electronic balances have a door that automatically opens and closes when a sample to be measured is put in or taken out. Such a balance is combined with a square or round balance weighing unit. There is a door that automatically opens and closes. In many cases, the pedestal on which the door is placed slides or rotates by driving a belt or gear. However, there is almost no known balance (hereinafter referred to as a balance with a windshield) in which the windshield can be attached or detached, in which the side plate of the windshield case or the top plate itself is automatically opened and closed. In addition, since the automatic opening / closing type is intended for automatic opening / closing itself, it is very heavy to open / close it manually, and almost no smooth movement can be obtained.

[0004]

SUMMARY OF THE INVENTION In the conventional balance with windshield, which manually slides the side plate and the door of the top plate, the sum-
There are few things that slide on the floor, and in most cases, they tend to get stuck or get caught somewhere in the middle. In addition, opening and closing of the door is heavy, and in particular, there are many cases where a detachable device and a system of opening and closing at the same time are heavy. In addition, when the measurement sample is taken in and out, there is often a problem that a large opening area cannot be obtained, and when the door is opened, the support of the door often needs to be devised to cause a trouble. Also, when measuring the mass with a windshield balance, depending on the measurement target and measurement method, manually open or close,
Alternatively, it may be more convenient to automatically open and close the object to be measured, and change the opening and closing method at any time. Also,
Most of the above-mentioned conventional automatic opening / closing type are expensive, and they can be switched manually or automatically, operate smoothly, and there is no inexpensive one.

The present invention has been made in view of the above-mentioned various problems, and it is possible to easily switch the opening and closing of the door manually or automatically, and the opening and closing movement of the door is extremely smooth. An object is to provide a balance with a windshield that can be manufactured at low cost.

[0006]

SUMMARY OF THE INVENTION In order to solve the above problems, the windshield balance according to the first aspect of the present invention comprises a front plate and a rear plate rising from the front end and the rear end of the bottom plate. Eccentric to either one from the upper center line
Attach the slide rail fixed to the top plate to the installed slide rail.
Id is inserted through the ball and two side plates are attached to the top plate.
Of the side plates on the side that becomes heavier as a result.
Make the length of the side plate lighter than the side plate
The lower end on the lower side is floated in the groove provided on the bottom plate, and the lower end on the heavier side is brought into contact with and fitted into the groove .

The windshield balance according to claim 2 is :
The front plate and the rear plate rising from the front and rear ends of the bottom plate are installed eccentrically to either of the center lines of the upper parts of the front and rear plates.
The slide guide fixed to the top plate is fitted into the slide rail via the ball, and the two side plates are elastically attached to the top plate.
Deformable thin wall and the respective fitted put the two butterfly-shaped member connected, the on the side surface of the slide guide mode - a friction wheel which is driven by a motor installed in contact and contactless freely through the cam mechanism It is characterized by

[0008]

According to the balance with windshield according to claim 1, the balance shown in FIG.
As shown in, the opening can be enlarged and opened when the sample is taken in and out. The operation of opening and closing the side plates 3 and 5 and the top plate 6 is smooth.

Further, according to the balance with windshield of claim 2,
Then, as shown in FIG. 10, when the sample is taken in and out, the top plate 6 and the side plates 3 and 5 can be automatically opened and enlarged and can be opened and closed very smoothly. In addition, this windshield balance can be opened and closed extremely smoothly even manually. In this case, the opening / closing method can be easily switched between manual opening / closing and automatic opening / closing.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of a windshield balance of the present invention, and FIG. 2 is a side view. 3 is a sectional view taken along the line AA of FIG. 1, and FIG. 4 is an enlarged view of a P portion of FIG. The rear plate 2 standing up from the rear end of the bottom plate 1 and the upper center line of the front plate 4 standing upright from the front end of the bottom plate 1 are respectively located at positions deviated to either side. The recesses 2a and 4a are formed, and the slide rail 7 is fixedly installed there. A slide guide 8 is fitted into the slide rail 7 via a ball 9. Ball - Le 9 is good are retained by a retainer 11 in a rotatable state to avoid mutual interference (see FIG. 4). The slide guide 8 is fixedly attached to the top plate 6 made of glass (but not necessarily glass).

[0011] Next, 10 are manufactured in a synthetic resin such as an elastic material a butterfly numbers like member disposed on the upper left and right ends of the windshield with the balance. A notch 10a is formed obliquely inside the butterfly plate-shaped member 10, and an end portion of the top plate 6 is fitted in the lateral direction (horizontal direction), and a glass side plate in the vertical direction (vertical direction). 3 and 5 are fitted respectively. The hinge- shaped member 10 serves to connect the top plate 6 and the side plates 3 and 5, but is also flexibly deformed by the notch 10a.

The lower ends of the left and right side plates 3 and 5 are fitted into the grooves 1a and 1b provided on the upper surfaces of both ends of the bottom plate 1 so as to slide there. In this case, since the slide rail 7 is installed so as to be biased to one of the side plates as described above, the load applied to one side plate (the side plate 3 in this embodiment) side is heavy and the other side plate ( In this embodiment, the load applied to the side plate 5) side is light. Therefore, in the unbalanced side plates 3 and 5, the height of the side plate 3 that is always heavy is made slightly longer than the height of the other side plate 5 so that the lower end portion of the side plate 3 contacts the groove 1a and the other side plate 5 The lower end portion of the is slightly floated from the groove 1b to form a clearance. According to this structure, when the left and right side plates 3 and 5 are opened and closed as a door, it can be opened and closed smoothly. Incidentally, handles 11 and 12 are attached to the left and right side plates 3 and 5, and a handle 13 is also attached to the top plate 6.

As described above, the configuration of the first embodiment of the balance with windshield of the present invention is such that either the center line of the upper portion of the rear plate 2 and the front plate 4 rising from the rear end portion and the front end portion of the bottom plate 1 is selected. A slide rail 7 is installed at a position biased to the upper side, and a slide guide 8 fixed to the top plate 6 is fitted into the slide rail 7 via a ball 9, and the upper end of the side plate and the top plate are since it is configured so as to simultaneously slide and an end portion so as to longitudinally long and the corner portion fitted respectively to the two butterfly numbers like member which is elastically deformable thin plate 3 side is heavy, 5 As shown, when the sample is taken in and out, the opening can be enlarged and opened and closed. The operation of opening and closing the side plates 3 and 5 and the top plate 6 is smooth.

Next, a second embodiment will be described in which the door of the windshield balance is constructed so that it can be opened or closed manually or automatically. FIG. 6 is a side view of a second embodiment of the windshield balance of the present invention, and FIG. 7 is a rear view. Like the first embodiment described above, in the second embodiment as well, the rear plate 2 that is installed upright from the rear end of the bottom plate 1 and the front plate that is also installed upright from the front end of the bottom plate 1 are installed. Four
A slide rail 7 is fixedly installed at a position deviated to either one of the upper center lines. The slide ray
A slide guide 8 is fitted in the ball 7 via a ball 9. The slide guide 8 is fixedly attached to the top plate 6 made of glass (but not necessarily glass).

The top plate 6 and the side plates 3 and 5 are integrally connected. The lower end of one side plate 3 is fitted in the groove 1a provided on the upper surface of the end of the bottom plate 1, and the lower end of the other side plate 5 is fitted in the groove 1b provided on the upper surface of the end of the bottom plate 1. In this case, since the guide rail 7 is installed at a position deviating to the one side from the center line of the top plate 6, the side plate 3 side is heavy and the side plate 5 side is light. Therefore, the height of the side plate 3 is made slightly longer than that of the side plate 5 so that the lower end portion of the side plate 3 contacts the groove 1a of the bottom plate 1 and the lower end portion of the side plate 5 floats a little above the groove 1b. Therefore, when the top plate 6 and the side plates 3 and 5 are moved, the operation is smooth.
It will be.

A column 20 is erected under the slide rail 7 at the rear of the rear plate 2. A space is provided on the column 20.
An inverted L-shaped leaf spring 22 is fixedly mounted between the rotor 21 and a motor 24 for driving a friction wheel 23 which is in contact with the side surface of the slide guide 8.
Is attached. As shown in FIG. 8 (A), a bracket 26 having a groove 26a is installed between the support 20 and the leaf spring 22 in the vicinity of a slightly lower portion thereof in two laterally fixed positions. The bracket 26 may be attached to the leaf spring 22 side or may be processed into the leaf spring 22. A plate cam 25 having a protrusion 25a and a lever 25b is fitted into the bracket 26 to form a cam mechanism . That is, FIG.
As shown in (B), the plate cam 25 has the projection 25a and the base end of the lever 25b at the groove 2 of the bracket 26, 26.
It is fitted into 6a and 26a and is attached so as to be rotatable about 90 degrees.

Therefore, in a state where the lever 25b of the plate cam 25 is vertically fitted into the groove 26a of the bracket 26,
The friction wheel 23 comes into contact with the side surface of the slide guide 8 (FIG. 8A), and when the switch of the motor 24 is turned on in this state, the slide guide 8 automatically slides on the guide rail 7. . In this case, since the ball 9 is arranged between the slide guide 8 and the slide rail 7, the top plate 6, the side plates 3, 5 and the like can be slid very smoothly to open and close. FIG. 10 is a side view showing a state in which the motor 24 is driven to automatically open the top plate 6 and the side plates 3 and 5.

Next, as shown in FIG. 9B, the plate cam 2
When the lever 25b of No. 5 is rotated by about 90 degrees, the plate cam 25 causes the plate spring 22 to which the motor 24 and the friction wheel 23 are mounted.
9A is elastically deformed by pressing, the contact between the friction wheel 23 and the side surface of the slide guide 8 is released as shown in FIG. 9A. Even in this state, since the ball 9 is arranged between the slide guide 8 and the slide rail 7, the top plate 6, the side plates 3, 5 and the like can be slid to open and close very smoothly by manually pushing. You can

As described above, the construction of the second embodiment of the balance with windshield of the present invention is one of the center lines of the upper portions of the rear plate 2 and the front plate 4 rising from the rear and front ends of the bottom plate 1. A slide rail 7 is installed at a position biased to the upper side, and a slide guide 8 fixed to the top plate 6 is fitted into the slide rail 7 via a ball 9 so that the upper end portions of the side plates 3 and 5 are connected to each other. A friction wheel 23 driven by a motor 24 is installed on the side surface of the slide guide 8 in contact with and out of contact with the end portion of the top plate 6 so that the side plates 3, 5 and the top plate 6 are simultaneously formed. Since it is configured to slide, as shown in FIG.
When the sample is taken in and out, the top plate 6 and the side plates 3, 5 can be automatically opened and closed in a large and extremely smooth manner. In addition, this windshield balance can be opened and closed extremely smoothly even manually. In this case, the opening / closing method can be easily switched between manual opening / closing and automatic opening / closing.

The details of the embodiment of the windshield balance of the present invention are as described above, but in the above embodiment, instead of the friction wheel 23 which contacts the side surface of the slide guide 8, FIG.
As shown in FIG. 1, the pinion 27 may be driven by the motor 24 and a rack 28 that meshes with the pinion 27 may be attached to the side surface of the slide guide 8. Further, the method of bringing the friction wheel 23 into contact with the side surface of the slide guide 8 is not limited to the plate cam 25 that elastically deforms the leaf spring 22, but another method, for example, sliding the friction wheel itself to make contact,
You may comprise so that it may become non-contact.

[0021]

As described in detail above, according to the balance with windshield of the present invention, the one in which the top plate, the side plate, etc. (door) has been crushed or caught at the time of manual opening / closing can be slid very smoothly. It can be opened and closed. Further, even when the doors such as the top plate and the side plates are automatically opened / closed, they can be slid and opened / closed similarly very smoothly. This windshield balance can be selectively opened or closed manually or automatically, and any opening / closing method can be used for smooth operation.
Can be done. Moreover, this windshield balance has a simple structure and can reduce the cost. Furthermore,
This windshield balance has various peculiar effects such as the automatic opening / closing device can be incorporated in a small space.

[Brief description of drawings]

FIG. 1 is a plan view of a first embodiment of a windshield balance of the present invention.

[Fig. 2]
1st of balance with windshield of this invention
It is a side view of the Example of.

3 is a sectional view taken along the line AA of FIG.

FIG. 4 is an enlarged view of part P of FIG.

FIG. 5 is a side view showing the first embodiment of the windshield balance of the present invention in a state where the top plate and the side plate are simultaneously opened.

FIG. 6 is a side view of a second embodiment of the windshield balance of the present invention.

[Figure 7]
Second aspect of the balance with windshield of the present invention
It is a rear view of the Example of.

FIG. 8 (A) is a view showing a state in which the friction wheel of the second embodiment of the present invention is brought into contact with the side surface of the slide guide, and FIG. 8 (B) is a plate on which the friction wheel is mounted. It is a perspective view of a state in which a plate cam for elastically deforming a spring is vertically arranged.

FIG. 9 (A) is a view showing a state in which the friction wheel of the second embodiment of the present invention is not brought into contact with the side surface of the slide guide, and FIG. 9 (B) is a leaf spring for mounting the friction wheel. FIG. 6 is a perspective view of a state in which a plate cam that elastically deforms is laid down.

FIG. 10 is a side view showing a second embodiment of the windshield balance of the present invention in a state where the top plate and side plates are simultaneously opened.

FIG. 11 is a view showing a device for operating a slide guide by a pinion and a rack instead of a friction wheel in a second embodiment of the windshield balance of the present invention.

[Explanation of symbols]

1 Bottom Plate 2 Rear Plate 4 Front Plate 3, 5 Side Plate 6 Top Plate 7 Slide Rail 8 Slide Guide 9 Ball 10 Butterfly Plate Member
11 Cage 20 Strut 22 Leaf Spring 23 Friction Wheel 24 Motor
25 plate cam 26 bracket

Continuation of front page (56) Reference JP-A-61-213731 (JP, A) Actual flat 5-62825 (JP, U) Actual flat 5-30738 (JP, U) Actual flat 6-16827 (JP , U) (58) Fields investigated (Int.Cl. ⁷ , DB name) G01G 21/30

Claims (2)

(57) [Claims] 1. A front plate and a rear plate rising from the front end and the rear end of the bottom plate are deviated to one of the center lines from the upper center line.
On the slide rail that was erected and installed, the screw fixed to the top plate
Insert the ride guide through the ball and insert it into the top plate.
Sides that become heavier as a result of fitting and connecting the two side plates to two thin, elastically deformable butterfly plate-shaped members
If the height of the plate is made longer than the height of the side plate on the side that becomes lighter,
The lower end of the lighter side in the groove on the bottom plate.
A balance with a windshield, characterized in that the lower end of the heavier side is brought into contact with and fitted into . 2. The front plate and the rear plate rising from the front end and the rear end of the bottom plate are deviated to one of the center lines from the upper center line.
On the slide rail that was erected and installed, the screw fixed to the top plate
Insert the ride guide through the ball and insert it into the top plate.
Two side plates are fitted into and connected to two elastically deformable thin butterfly-like members, and a friction wheel driven by a motor is attached to a side surface of the slide guide via a cam mechanism. A windshield balance that is installed so that it can be contacted or not contacted.