JPH028176Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rack engagement device in a Roberval type balance.

In conventional rack engagement, as shown in FIG.
After the rack pin 90 is engaged with the rack pin 90 having a diameter of 0a, the rack pin 90 is fixed to the arm piece 80 fixed to the tray holder frame 20, and a rack spring 100 is stretched between the arm piece 80 and the rack 50. Usually, when fixing the rack pin 90 to the arm piece 80, the rack 50 must be attached to the rack pin 90, which is not only troublesome to handle during assembly, but also difficult to handle.
Depending on how it is handled, it may deform the rack, etc., and the number of man-hours required for modification may increase, making assembly difficult.

This invention is designed to solve the above drawbacks by using rack pin 9.
The front of the rack is fixed to the arm piece 8, and the engaging hole 5a of the rack 5 can be fitted into the fixed rack pin 9, thereby making the scale easy to handle, easy to assemble, and improves productivity. It is about providing.

An embodiment of the present invention will be described below with reference to the drawings.

In FIGS. 2 and 3 showing the present invention, 1 is a frame. The frame 1 is engaged with the stays A and B and the pan holder frame 2 through a shaft pin 3.
A measuring spring 4 is stretched between the bottom part 2a of the frame 1 and the upper part 1a of the frame 1, and the weight loaded on a plate (not shown) attached to the upper part 2b of the plate receiving frame 2 is applied to the elongation of the measuring spring 4. This is a so-called Robervall type scale that converts the amount of elongation and displays the weight on a scale plate 7 via a rack 5, a pinion 6, and a pointer (not shown).

In the scale of the above-mentioned Roberval type, 8 is a single plate, and is an arm piece in which a fixing part 8a and a hook part 8b are integrally molded. A fixed portion 8a of this arm piece 8 is fixed to the tray receiving frame 2.

9 is a rack pin. The rack pin 9 is made of sawn material or a header, has a mirror-finished surface, has a hemispherical protrusion 9a at one end, and fixes the protrusion 9a side to the arm piece 8. 5 is easy. The rack 5 has an engagement hole 5a, a hook hole 5b, and a toothed portion 5c. The rack spring 10 is stretched between the hook portion 8b of the arm piece 8 and the hook hole 5b of the rack 5, and the engagement hole 5a of the rack 5 is connected to the rack pin. 9, the tooth portion 5c is attached to the pinion 6 on the side of the convex portion 9a.
It is pulled lightly to the side.

Due to the above structure, when assembling, the teeth 5 of the rack 5
After aligning pinion c with the proper position of the pinion 6, the engagement hole 5a of the rear rack 5 is engaged with the tip end 9b of the rack pin 9.

In this way, in the past, the rack 50 was engaged with the rack pin 90 from the beginning as described above, but in the present invention, the rack 5 can be attached to the rack pin 9 as described above, so assembly is easy. Not only will the Rack 5 not be deformed while being carried around,
Therefore, the yield is high and productivity is improved, which is highly effective.

[Brief explanation of the drawing]

Fig. 1 is a front view showing the main parts of the conventional example, Fig. 2 is a plan view showing the main parts of the present invention, and Fig. 3 is a front view showing the main parts of the conventional example.
The figure is a front view. 2,20...Plate holder frame, 5,50...Lack,
8,80...Arm piece, 9,90...Rack pin, 1
0,100...Lack spring.

Claims (1)

[Scope of utility model registration request] An arm piece 8 is formed by integrally molding a fixing part 8a and a hook part 8b with a single plate fixed to a plate receiving frame 2, and a semispherical convex part 9a is provided at one end, and a rack pin 9 whose surface is mirror-finished is fixed. The engaging hole 5a of the rack 5, which is provided with the engaging hole 5a, the hooking hole 5b, and the tooth portion 5c, is fitted from the tip 9c of the rack pin 9, and the rack 5 is freely fitted onto the rack pin 9. The engagement hole 5a of the rack pin 9 is placed on the protrusion 9a side of the toothed portion 5.
engagement of a rack in a scale characterized in that a rack spring 10 is stretched between the rack 5 and the hook portion 8b so as to lightly pull the pinion 6 toward the pinion 6 which is pivoted to the frame 1; Device.