CN2263336Y

CN2263336Y - Spring balbance

Info

Publication number: CN2263336Y
Application number: CN 96234340
Authority: CN
Inventors: 廖志明
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-02-29
Filing date: 1996-02-29
Publication date: 1997-09-24
Anticipated expiration: 2006-02-28

Abstract

The utility model relates to a spring balbance whose main structure is that a heavy object drives a rack through a stretching spring to make gears and an indicating needle rotate so that the weight of the heavy object is indicated. Becuase the spring balbance is added with a set of speed-changing gears, the rotation of the indicating needle is increased to 2-11 turns from the existing maximum one turn, the precision of the spring balbance can exceed that of a bench balance, and in addition, a set of number values are marked on the widened rack, a small window on a dial plate is especially used for displaying the kilogram number of the weight of the heavy object so that the utility model has clear reading.

Description

Dexterous spring balance

The utility model relates to a kind of dexterous spring balance.

Portable spring balance has two kinds at present: a kind of is the rectilinear motion indicating type, because pointer displacement is too little, weighing precision is poor, withdraws from the market substantially.Second kind is the rotary indicator formula, and pointer can rotate 360 ° at most, though the displacement of pointer is amid a sharp increase, but still the minimum accuracy requirement that does not reach national regulation.National regulation fills the easy 4 grades of titles of minimum rank scale of being permitted circulation, is 5 ‰.In addition, drop handle is two sections contacts of the garden arc of long same radius-of-curvature with being connected of fulcrum of scale; The connecting rod that connects main spring and weight hook is subjected to claiming the constraint of an aperture on the shell, as long as the finger of holding drop handle like this during weighing departs from the vertical warp of weight center of gravity, the fulcrum of drop handle and title, connecting rod and shell just become can produce friction force, the numerical value that weighs up is that a component of gravity adds friction force, influences the accurate of weighing.

The purpose of this utility model is that a kind of improved spring balance will be provided, and it can make the displacement of pointer strengthen 1～10 times, and friction force does not take place between drop handle and fulcrum, connecting rod and the shell in 1～10 times of the yet corresponding increasing of the smart change of weighing.

The purpose of this utility model is achieved in that increases by one group of speed gear (2), and just pointer can rotate 2 π～22 π radians, main show " gram " or " two "; On index dial, increase a wicket, count with " kilogram " number or " jin " that demonstration is marked on the tooth bar; The fulcrum that will contact with drop handle makes an edge of a knife into, and strengthens the size of passing the aperture of connecting rod on the shell.

The utility model is because pointer no longer is can only revolve at most to turn around, but 2～11 circles, make weighing precision can improve 1-10 doubly, can reach country and fill the grade scale standard of circulation perhaps owing to the main indicant of the pointer of rotation heavy " gram " is counted or " two " number, " kilogram " number that the then special indicant of the wicket of setting up is heavy or " jin " number, claim the thing fashion to recognize and read, can avoid misreading; Fulcrum makes cutter into and after the hole increasing by connecting rod on the shell, when claiming thing, friction force no longer takes place the hole on drop handle and fulcrum, connecting rod and the shell, and it is overdue to have reduced weighing.

The concrete structure of utility model is provided by following embodiment and accompanying drawing thereof.

Fig. 1 is according to the dexterous spring balance cut-away view that the utility model proposes.

Fig. 2 is an outside drawing.

Below in conjunction with details and the working condition of above-mentioned accompanying drawing detailed description according to the concrete device that the utility model proposes.

This device comprises drop handle (1), and whole spring balance is suspended on the drop handle (1) by the edge of a knife (2).Zeroing screw (3) is pressed on one seat (16) of shell (15) by stage clip (4).(5) be main extension spring.(10) be small extension spring, play fixation, but tensile elongation will surpass the maximum elongation amount of main spring (5) when weighing, to guarantee the proportional with main spring (5) elongation with joint efforts of elastic force.The tooth bar (6) that moves up and down along with main spring (5) drives pinion wheel (9) rotation with its engagement, make with the coaxial gear wheel (8) of pinion wheel (9) with the unequal angular velocity rotation, its gear ratio is 1: 2 to 1: 11.Gear wheel (8) drives pinion wheel (7) rotation, and gear ratio is 2: 1～11: 1.The pointer (18) that is fixed on the pinion wheel (7) is just heavy at the last indicant of index dial (19).For convenient reading, on the tooth bar of widening (6), indicate the scale of " kilogram " number or " jin " number in addition, show by the wicket on the index dial (20).Scale on pointer (18), index dial (19) and the tooth bar (6) can be made double-sided display.

Small extension spring (10) guaranteed to mesh between the tooth closely.The size of the aperture on the shell (13) and (17) has been increased to the gap that the drop handle that guarantees connecting rod has 1～5mm on every side.Limited post (12) is limited to the elongation of spring (5) in the elastic limit.(21) be hanging hook.Be marked on " kilogram " several or " jin " the several connecting rods (14) last (comprising on the scale that is synchronized with the movement with it that is fixed on the connecting rod) that also can be marked on the tooth bar (6).Extension spring (11) has guaranteed the tight engagement between tooth bar (6) and pinion wheel (9) and gear wheel (8) and the pinion wheel (7).Gear (8) is spent greater than 0 with the center line of (7) and the angle of tooth bar (6).

Claims

1, dexterous spring balance, this device has drop handle (1) main spring (5) tooth bar (6), pinion wheel (9) with tooth bar (6) engagement, it is characterized in that having on the pinion wheel (9) gear wheel (8) identical with its coaxial angular velocity of rotation, gear ratio is 1: 2 to 1: 11, gear wheel (8) meshes with pinion wheel (7) again, gear ratio is 2: 1 to 11: 1, pointer (18) is fixed on the pinion wheel (7), the tooth bar of widening (6) is marked with one group of numerical value, by a window (20) of going up increase at index dial (19) numerical value is shown.

2, device according to claim 1, the numerical value that it is characterized in that being marked on the tooth bar (6) also can be marked on the connecting rod (14), special " kilogram " number or " jin " number of showing.

3, device according to claim 1 is characterized in that drop handle (1) and being connected of this device remainder are the contacts by the point of the edge of a knife (2).

4, device according to claim 1 is characterized in that the center line of gear (8) and gear (7) and the angle of tooth bar (6) spend greater than 0.

5, device according to claim 1 is characterized in that pointer (18), and scale on index dial (19) and the tooth bar (6) can be made double-sided display.