CN2140053Y - Extension steelyard - Google Patents

Abstract

The utility model relates to an extension steelyard, which comprises a steelyard bar, a weight 1 and a lift button 2. The steelyard bar adopts the inside and outside bars structure, definite frictional force between the inside bar 4 and the outside bar 3 ensures the inside bar extracted partially from the outside bar and be stable at any position. The high level reading number of the extension steelyard is read out from the outside bar, and the low level reading number is read out from the inside bar; consequently the graduations of the inside bar is more dispersive. The extension steelyard overcomes the defect that the graduation on the current steelyards is dense consequently the low level reading number is inaccurate, and has convenient operation.

Description

Extension steelyard

The utility model relates to a kind of weighing apparatus, particularly a kind of Extension steelyard.Steelyard is the weighing apparatus that generally uses at present, and it has characteristics easy to use, portable.But owing to limited by size, the steelyard high scale is intensive, " two " that read or more lower-order digit is just inaccurate.

The purpose of this utility model provide a kind of not only have be easy to carry, characteristics easy to use, can also accurately read the steelyard of low bit readings.

The utility model comprises the arm beam of steelyard, sliding weight of steelyard, carries knob, and difference is that the arm beam of steelyard is inside and outside bar structure, has certain friction force to make interior bar part extract and to be stabilized in arbitrary position out from outer bar between interior bar and outer bar.

The arm beam of steelyard of the present utility model adopts inside and outside bar structure, with high-order graduated scale outside on the bar, for example " jin ", the low level graduated scale on interior bar, for example " two ".Determine high place reading with sliding weight of steelyard during use, the length that remainder is pulled out with interior bar determines that long distance is read low bit readings on the available so interior bar, thereby reading is accurate and convenient.

Fig. 1 is the utility model structural drawing.

Fig. 2 is the utility model schematic diagram when not hanging weight.

Fig. 3 is the utility model schematic diagram when hanging up weight.

As shown in Figure 1, this steelyard comprises sliding weight of steelyard 1, carries knob 2, and its arm beam of steelyard is that outer bar 3 and interior bar 4 fits form, and indicates high-order scale on the outer bar, indicates the low level scale on the interior bar, has enough friction force to make interior bar can partly extract and be stabilized in arbitrary position out between inside and outside bar.

As shown in Figure 2, when not hanging weight, sliding weight of steelyard places " 0 " scale, the equilibrium condition of scale:

G cuts or polish jade with an emery wheel OB=G10C1+G2OC2 (1)

Wherein C1 is outer bar center of gravity, and C2 is interior bar center of gravity, and G1 is that outer bar is heavy, and G2 is that interior bar is heavy.

As Fig. 3, when weight G is arranged on the hook, could balance if sliding weight of steelyard must mobile L apart from scale:

GOA=G cuts or polish jade with an emery wheel (L-OB)+G1OC1+G2OC2 (2)

Get by (1) and (2)

G=(G stone roller)/(OA) L (3)

Hence one can see that, and outer bar high scale is uniform.When G was integer, for example integer jin only just can be read by outer bar.

If G contains " jin " following reading, determine its high position with said method after, pull out interior bar again, establishing the distance that interior bar moves is that L ' reaches balance, then

G ' OA=G cuts or polish jade with an emery wheel (L-OB)+G1OC1+G2(OC2+L ') (4)

(4)-(2),

（G′－G）OA＝G2L′

∴ΔG＝ (G2)/(OA) ·L′ （5）

The bar high scale also is uniformly promptly, and need only represent that ten liang get final product with ten scales.

By same principle, if interior bar be inside and outside bar structure, promptly this bar is three layers of bar structure, then can read littler one-level reading.

Establish ball pen in the arm beam of steelyard, but one-object-many-purposes.

Claims (3)

1, a kind of Extension steelyard comprises sliding weight of steelyard 1, the arm beam of steelyard, carries knob 2, it is characterized in that the arm beam of steelyard is inside and outside bar structure, has certain friction force to make interior bar can partly extract and be stabilized in arbitrary position out between interior bar 4 and the outer bar 3.

2, steelyard according to claim 1, bar also is inside and outside bar structure in it is characterized in that.

3, steelyard according to claim 1 is characterized in that establishing in the arm beam of steelyard ball pen.

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