CN2196295Y - Portable spring balance - Google Patents

Abstract

The utility model relates to a portable spring balance. For improving weighing precision, except that the utility model has a force measuring main spring and a main scale, a force measuring auxiliary spring and an auxiliary scale which is matched with the force measuring auxiliary spring are additionally arranged. The lower ends of two force measuring main and auxiliary springs are all connected to a sleeve barrel with a balance hook; the graduation value of the auxiliary spring is only a fraction of that of the main spring. When weighing, the sum of the reading values of the main spring and the auxiliary spring is the weight of a measured object.

Description

Portable spring balance

The utility model belongs to the utensil of weighing, and is a kind of portable spring scale.

At present, widely used on the market spring balance is the tensile force type spring balance mostly, and its structure all is made up of the scale in sleeve, the insertion sleeve and the dynamometer spring of coupling sleeve and scale, hangs with steelyard hook in the lower end of sleeve.This class spring balance is because require to be easy to carry, and its length dimension can not design too greatly, requires it to have certain range of weighing again simultaneously, so its dynamometer spring is all shorter, the elastic deformation that is allowed is very limited.Therefore, the survey precision of this class spring balance is lower, and its scale division value minimum also has 50 grams, far below the scale division value of traditional steelyard.This class spring balance can only play a part rough weighing in marketing.

The purpose of this utility model provides the higher portable spring scale of a kind of measuring accuracy.

Under the situation of having only a dynamometer spring, the gravity of measured object equals this spring force when weighing.If again and connect a dynamometer spring, then the gravity of measured object equals two spring force sums on steelyard hook.At this moment, if with one of them spring as main spring, be used to bear most gravity, and another spring is as auxiliary spring, be used to bear all the other very gravity of fraction, so just can utilize auxiliary spring further scale division value to be reduced, promptly measuring accuracy can significantly improve.

The purpose of this utility model realizes according to above-mentioned principle.The solution that the utility model proposed is: the portable bullet weighing-appliance that is provided has sleeve and main scale that inserts this sleeve of a lower end belt scale hook, is connected with the dynamometry main spring between main scale and the aforementioned sleeve.Improvements of the present utility model are: said main scale is the tubular of hollow, inserted a complementary scale in it, be connected a dynamometry auxiliary spring between this complementary scale and the aforesaid sleeve, wherein the scale division value of complementary scale is the 1/n of main scale scale division value, and n is the integer greater than 1 in the formula.That is to say that the bearing capacity of auxiliary spring (or being called intensity) is the part of main spring just.For the ease of calculating, above-mentioned n value is generally 5 or 10.

Hold the main scale upper end when weighing earlier, hang up measured object, the main spring distortion.To move on the complementary scale with the another hand then, promptly give power that makes progress of complementary scale, this power is applied on the sleeve by auxiliary spring, makes on the sleeve and moves.If make move on on the upper end of sleeve concordant with the main scale scale mark, then this moment main scale reading and the reading sum of the complementary scale weight that is measured object.

Compare with existing spring balance, of the present utility model highly sensitive, measuring accuracy can improve 5-10 doubly, and overall dimensions there is no too big variation.Another advantage of the present utility model is to utilize auxiliary spring and complementary scale to carry out the metering of little weighing.Should be inverted this spring balance this moment, and measured object is hung on the complementary scale.

Below in conjunction with accompanying drawing content of the present utility model is illustrated.

Fig. 1 is one-piece construction figure of the present utility model.

One of constitutional diagram when Fig. 2 is the utility model weighing.

Two of constitutional diagram when Fig. 3 is the utility model weighing.

As shown in Figure 1: main scale 1 is a tubular, and all there is screw thread at both ends.Its upper end is connected with a hand-held ring 2, portable usefulness during in order to weighing; Its lower end cooperates with snap ring 15, and in order to connect main spring 3, the other end of main spring 3 is connected with the lower end of sleeve 6.For ease of regulating the zero-bit of main scale, be provided with one in the lower end of sleeve 6 and regulate bolt 4, main spring 3 lower ends link to each other with adjusting bolt 4 in a spiral manner.Regulating bolt 4 can directly be connected together with sleeve 6, but for the ease of processing with install, and regulates bolt 6 and is by the spiral lower cover 7 of sleeve and will regulate bolt 4 with the snap ring 5 that has internal and external screw thread and sleeve 6 is connected as a single entity.Complementary scale 10 also is a tubular, and it inserts in the main scale, and its upper end is provided with little title hook 13, is connected with an auxiliary spring 9 in a spiral manner between its lower end and the adjusting bolt 4.In order to prevent that complementary scale from deviating from main scale, be connected with a T shape bar 12 regulating bolt 4 upper ends, the upper end of T shape bar 12 is stretched in the complementary scale, and the lower port of complementary scale is blocked with snap ring 14 again.Like this, T shape bar upper end just plays a part axial limiting to complementary scale.For ease of calculating the reading of complementary scale, the slip ring 11 of on complementary scale, having gone back suit.During weighing, measured object hangs on the big steelyard hook 8 of sleeve lower end, with portable hand-held ring 2, the state of this moment as shown in Figure 2: the reading of main scale is between 0.7-0.8.And complementary scale does not stress, and follows sleeve 6 and moves down, and its position that moves down is write down by slip ring 11.Carry complementary scale on hand with another then, make that to move on to the top on the sleeve 6 concordant with " 0.7 " scale mark of main scale, its state as shown in Figure 3: the reading on the complementary scale (being the scale lattice number between slip ring 11 and the hand-held ring 2) is 2.If the scale division value of main scale is that the scale division value of 0.1kg complementary scale is 0.01kg, the weight of measured object is 0.7+0.01 * 2=0.72(kg) so.

Claims (3)

1, a kind of portable spring scale, sleeve (6) and a main scale (1) that inserts this sleeve with a lower end belt scale hook, be connected with dynamometry main spring (3) between main scale and the sleeve, it is characterized in that said main scale (1) is a hollow tube-shape, inserted a complementary scale (10) in it, be connected a dynamometry auxiliary spring (9) between this complementary scale and the aforementioned sleeve (6), the scale division value of complementary scale is the 1/n of main scale scale division value, and n is the integer greater than 1 in the formula.

2, spring balance as claimed in claim 1 is characterized in that said n value is 5 or 10.

3, spring balance as claimed in claim 2 is characterized in that being provided with one and regulates bolt (4) on sleeve (6), the lower end of dynamometry main spring (3) links to each other with this adjusting bolt (4).

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