JPS5820898Y2 - Magnifying measurement device for ultra-thin weight scales - Google Patents

Description

[Detailed description of the invention] The present invention is an enlarged measuring device for an ultra-thin scale that uses a leaf spring or the like as a support spring to make the thickness (or height) of the scale as thin as possible (lower). Regarding.

Conventional weighing scales of this type used a coiled spring to support the load on the treadle, so a tower-shaped support frame of a certain height was used. Ta.

For this reason, it was essential that the casing be thick enough to accommodate this support frame.

On the other hand, in a system that eliminates a relatively high support frame for the spring by using a leaf spring instead of a coil spring, the load on the tread is concentrated through the crossbar and the support plate is lowered. The range has to be narrower than conventional products.

Therefore, in the present invention, in order to avoid this drawback, the descent of the support plate is doubly magnified and transmitted to the rack, so that the scale plate can be rotated appropriately.

For this reason, in the present invention, the first elevating frame and the second elevating frame are linked by a link lever, the pivot support of the second elevating frame is provided at a higher position than the pivot support of the first elevating frame, and 1
The rotation distance enlarged by the second elevating frame is further enlarged by the second elevating frame and transmitted to the rack for rotating the scale plate, and this expanding device is configured as simply as possible to facilitate manufacturing. It is closed.

The gist of the present invention will be explained below based on the embodiments shown in the drawings.

1 is the base case, and on top of this is a cover that also serves as a treadle (not shown)
It is similar to the conventional product in that the load is concentrated on the support plate 5 through a pair of horizontal rods 3 and 4 having fulcrums 2 at the four corners of the base case 1. be.

Note that this horizontal rod 3 is suspended from the horizontal rod 4 by a ring-shaped locking member, but this locking member is omitted in the figure.

A base end 6' of a leaf spring 6 is fixed to the support plate 5, and a distal end 6'' is supported by a swingable support device 7, which will be described later.

The support device 7 includes a U-shaped support frame 10 consisting of a bottom plate 8 and support arms 9 bent vertically at both ends, and an opening-shaped swinging frame 10 with support protrusions 11 protruding from one side of both ends. The tip 6'' of the leaf spring 6 is suspended on the lower horizontal rod 13 of the iron frame 12 via the chevron-shaped swinging piece 14, and the projecting piece 1
1 is suspended in a V-shaped notch 15.

Therefore, when the support plate 5 moves down based on the load on the tread, and the leaf spring 6 is forcibly bent with the suspension position of the tip 6'' as the support axis, the suspension position is Although the spring 6 is moved along the longitudinal direction, this movement is carried out smoothly by rotation of the swing frame 12 about the support protrusions 11, 11 as fulcrums.

Reference numeral 16 denotes a two-pronged operating frame with a horizontal horizontal rod 17 projecting upward from the center front, and the tips of the two prongs are fixed to both sides of the support plate 5, so that the frame is operated integrally with the support plate 5. That's how it is.

The aforementioned horizontal rod 17 is provided above the leaf spring 6 with a gap therebetween.

Reference numeral 18 shows the enlarging device of the present invention, which has a base wave 1 and a bottom plate 1.
The pivot support 2 near the front of the L-shaped support frame 20 to which 9 is fixed
2 supports a substantially U-shaped first elevating frame 21, and a support plate 24 is bent and stretched inward from a central frame 23 of the iron frame 21.

Reference numeral 25 denotes an adjustment screw screwed into this support plate 24, with its large head 26 facing the upper surface of the horizontal frame 17 of the aforementioned operating frame 16.

Therefore, the screwing position 27 of the screw 25 is located in front of the shaft support 22 as shown in the third figure, and the operating distance of the shaft support 28 of the link lever 30 is changed by the rotation of the support arm 21a as will be described later. The position of the shaft support 22 is regulated so that the distance is greater than the working distance of the screw-in position 27.

Reference numeral 31 denotes a second U-shaped elevating frame, and as shown in the third figure, this pivot support 32 is provided at a position slightly higher than the height of the pivot support 22 of the first elevating frame 21, and one support arm 31 a At the tip of the lever 30, the lever 30 is supported by a shaft support 33, and the line connecting the shaft supports 22, 28, 32, and 33 has a parallelogram shape and is at the same angle as the rotation angle of the support arm 21a. Support arm 31a
is rotated.

The other support arm 31 b of the second elevating frame 31 is longer than the support arm 31 a, and one end of a rack 36 for rotating the scale plate 35 is supported by a shaft support 37 at its tip. The distance d' between the pivot supports 32 and 37 is larger than the distance d between the pivot supports 32 and 33.

Therefore, even if the rotation angles of the support arms 31a and 31b are the same, the rotation distance of the pivot support 37 of the support arms 31a is
It is designed to be much larger than the rotation distance of the pivot support 33.

The rack 36 is constantly pulled to the right in FIG. 1 by the spring 38, and therefore the second elevating frame 31. Link lever 30. The head 26 of the adjusting screw 25 is placed in light contact with the surface of the horizontal frame 17 of the constantly operating frame 16 via the first elevating frame 21.

To explain how the device of the present invention having such a configuration operates, when the support plate 5 is moved down via the horizontal bars 3 and 4 due to the load on the tread, the leaf spring 6 integrated with the support plate 5 is moved downward. , is forcibly bent with its tip 6'' as a support position, and the downward movement distance of the support plate 5 is controlled in accordance with the magnitude of the load.

As a result, the operating frame 16 integrated with the support plate 5 is also moved down, and the horizontal frame 17 is also moved down at the same time. Along with this, the first elevation frame 2 is moved around the pivot support 22.
1 and rotated clockwise in FIG.

This rotation is carried out via the link lever 30 to the second elevating frame 31.
will be rotated in the same direction.

Therefore, the pivot support 37 of the support arm 31b is moved more than the pivot support 33 of the support arm 31a in accordance with the ratio of the distance d' to the distance d.

That is, in the first elevating frame 21, the moving distance of the threaded position 27 of the adjusting screw 25 is expanded at the pivot support 28, and is further expanded at the pivot support 37 of the second elevating frame. As a result, the operating frame 16
The relatively small downward movement of the rack is magnified to move the rack,
This is to maintain proper rotation of the scale plate.

When the load on the treadle is removed in this way, the support plate 5 returns to its original position due to the restoring elasticity of the leaf spring 6, and the operating frame 1
6, the first and second elevating frames 21 and 31 are also restored to their original state against the force of the spring 38.

At this time, the supporting device 7, which is configured to be swingable, can eliminate as much as possible errors caused by friction between the leaf springs 6 during the bending of the leaf springs 6, and can perform accurate measurements.

As described above, the present invention can provide an excellent magnifying device that can sufficiently accommodate the measuring mechanism even in a thin (low) casing and still operate properly. , provides an enlargement device consisting of a relatively simple first elevating frame and a second elevating frame, which is easy to incorporate and can be configured compactly, so that the volume of the casing can be reduced as appropriate. This makes it possible to achieve excellent practical effects.

In this embodiment, a leaf spring was used as the support spring, but it goes without saying that a conventional coiled spring with the length shortened to the maximum may also be used. .

[Brief explanation of drawings]

Fig. 1 is a plan view of a weight scale equipped with the device of the present invention with the tread removed, Fig. 2 is a partially cutaway longitudinal side view, Fig. 3 is an enlarged side view of the main part, and Fig. 4 is the main part of the scale. It is a partially exploded slope view. 1... base, 2... fulcrum, 3, 4...
...Horizontal rod, 5...Brace plate, 6...
Leaf spring, 6′... Base end of leaf spring, 6″...
... Tip of leaf spring, 7 ... Swingable support device, 8 ... Bottom plate, 9 ... Support arm, 10.
...Support frame, 11...Support protrusion, 12.
... Swing frame, 13 ... Lower horizontal rod, 14.
...Rocking piece, 15...Depth of cut, 16...
...Two-pronged operating frame, 17...Horizontal horizontal rod,
18... Magnifying device, 19... Bottom plate, 2
0...Support frame, 21...First elevation frame, 21a, 21b...Support arm, 22, 28°32
．． 33...Axis support, 23...Central frame,
24...Brace plate, 25...Adjustment screw, 2
6...Head, 27...Screw insertion position, 30...Link lever, 31...Second elevation frame, 31a, 31b. ...support arm, 35.
...Scale plate, 36...Rack, 37...
...Axis support, 38...Spring.

Claims (1)

[Scope of utility model registration request] In an ultra-thin weight scale that uses a leaf spring or the like as a support spring for the load on the tread, the first weighing scale rotates via an adjustment screw that moves with the operation of the support plate that concentrates the load on the tread. A U-shaped elevating frame is provided, and a second U-shaped elevating frame is provided which is interlocked with the first elevating frame via a link lever, and the lever is pivotally supported on one support arm of the second elevating frame. On the other hand,
A magnifying measurement device characterized in that a rack for rotating a scale plate is pivotally supported on the other support arm, and the rotation radius of the pivot support on the lever side is smaller than the rotation radius of the pivot support on the rack side.