CN87206639U

CN87206639U - Double vernier (one is on a plane and the other is on a curved surface) caliper

Info

Publication number: CN87206639U
Application number: CN 87206639
Authority: CN
Inventors: 古新民
Original assignee: Individual
Current assignee: Individual
Priority date: 1987-04-16
Filing date: 1987-04-16
Publication date: 1988-03-30

Abstract

The utility model provides a curved and straight vernier caliper with double verniers, belonging to a novel vernier caliper. The utility model is characterized in that vernier caliper is provided with a curved face vernier and meanwhile a plane vernier. Two verniers are respectively used by every unit, and figures in different accuracy can be readout, wherein, the reading figure of the curved face vernier can reach below 0.0001 mm.

Description

Double vernier (one is on a plane and the other is on a curved surface) caliper

The present invention relates to a kind of linear measure longimetry, the measurer when particularly accurately measuring.

U.S. Pat-No. 2855684 has provided a kind of micrometer callipers, makes the reading value of vernier caliper can be less than below 0.02 millimeter; But because footpath reasons of error in its dog screw makes that the error when measuring is bigger.Provided a kind of micrometer callipers of forming eccentric structure on the pipe bar that is shaped on the part screw thread that microdrum is contained in after 8 years for US-3270422 number again, the size datum error is greatly reduced, because the size of uncontrollable ergometry and can not get rid of the influence that dust is measured the spiral width of cloth, make stochastic error bigger, and have the pipe bar manufacturing of portion with external threads difficult on outer cylinder surface, precision is lower.

The objective of the invention is to overcome the shortcoming of well known device, a kind of new vernier caliper is provided, not only have straight vernier caliper advantage easy to use, and the size datum error is further dwindled on structure, get rid of the influence in stochastic error source.

Invention is to be furnished with on the main scale screw rod of fixing measuring jaw by the slide rail that is shaped on that is carved with the length scale mark at, loading onto one is carved with straight and movable measuring jaw sliding sleeves two kinds of verniers of curved surface, same with screw thread and the main scale screw rod composition concentric structure that matches, and the microdrum that has device for measuring force and can fast moving be furnished with dust arrester combines and forms that measuring mechanism realizes.

The present invention promptly has straight vernier caliper advantage easy to use, has higher reading accuracy again, makes reading value can reach millimeter following four decimals.Compare with above-mentioned patent, because the improvement size datum error of structure is further dwindled, the stochastic error source is got rid of preferably, has improved the degree of accuracy of measuring.

The concrete structure of invention is provided by following examples and accompanying drawing thereof.

Fig. 1 is the front view of right and wrong double vernier slide calliper rule

Fig. 2 is the sectional view along the 1-1 line

Fig. 3 is the amplification view of microdrum

Fig. 4 is the sectional view along the 2-2 line

Fig. 5 is the cut-open view of part 17

Fig. 6 is the front view of part 21

Describe concrete structure of the present invention in detail below in conjunction with accompanying drawing.

The fixedly main scale screw rod (10) of measuring jaw (1) of being furnished with that the length groove is arranged, its transverse shape as shown in Figure 2, slide rail that is shaped on it (31) and scale mark are in the same side of screw rod, scale mark is on the inner plane (32) of a recessed main scale screw rod (10), and the plane (31) that this plane likens to slide rail exceeds certain distance; End face at main scale screw rod (10) also has a plane (30), for positioning screw (4) location usefulness, all is shaped on screw thread on its outer cylinder surface, and as the size datum of measuring, inside is a blind hole, with weight reduction.

Be shaped on movable measuring jaw (2) on the movable measuring jaw sliding sleeve (3), dog screw (4) also is housed, have a window (5) in its front, be shaped on straight vernier scale (12) in the window bottom, splicing or riveting are on movable measuring jaw sliding sleeve (3); Right-hand member is carved with curved surface vernier line (6), and movable measuring jaw sliding sleeve (3) slides on the outer cylinder surface of main scale screw rod (10) with inner cylinder face, and straight vernier scale (12) is gone up at slide rail (31) and slided.Spring leaf (14) is fixed on the measuring jaw sliding sleeve (3) by screw (13) and slides together thereupon.

Microdrum (8) is formed concentric structure with the external thread of internal thread (28) and main scale screw rod (10) and is screwed mutually, dynamometry control device (9) is made up of ratchet (19) ratchet (18) and spring (33), be fixed on the right-hand member of differential nut (17) by nut (20) and screw thread (27), ratchet (18) is contained in the inside of hole (26).Be furnished with at the two ends of differential nut (17) shape as shown in Figure 6 elasticity dedusting pad (21) and (25) it is fixing by elastic scheibe (22).The top of the U-shaped slide block (24) that matches with the screw thread (28) of differential nut (17) part has the groove of mounting spring (23), and its inner cylinder face is gone up at main scale screw rod (10) and slided; The differential cover (15) that the other end of spring (23) is carved with reticule (7) compresses, the pressure that produces makes screw thread (28) form the precision-fit that does not have radial play with the main scale screw flight, when pushing differential cover (15) spring (23) shortened, screw thread (28) can be thrown off the outside surface of main scale screw thread (10), makes microdrum (8) along main scale screw rod fast moving.Measurement face of microdrum (29) and screw thread (28) coexist on the part (17).Reduced the size datum error.Short pin (16) is fixed together differential cover (15) and differential nut (17), to reduce the possibility of measurement face (29) distortion.

Tail end protects piece (11) and is installed in the afterbody of main scale screw rod with screw thread, with reduce when placing slide calliper rule, damage externally threaded may.

Use-pattern during measurement has two kinds.

1, use straight trip reading: only need make microdrum (8) be on the position that does not influence measurement this moment, and the mode of use activity measuring jaw sliding sleeve is identical with existing straight vernier caliper.

2, use the curved surface vernier reading; Microdrum (8) is in not to be influenced on the position of measuring length, move movable measuring jaw sliding sleeve (3), slight contact object, rotate microdrum by dynamometry control device (9) then, behind the right side of the measurement face of making (29) contact activity measuring jaw sliding sleeve, from the scale of main scale screw rod read millimeter level integer, from the scale mark of curved surface vernier read corresponding decimal, sum of the two is the size between the measuring jaw.

When needs fast moving microdrum, can be to radially pushing the place of being carved with triangle mark (or other marks); Microdrum can be moved on to the desired position fast after the differential nut is thrown off, unclamp then screw thread is engaged again.

Vernier caliper provided by the invention also can be made the measurer that the curved surface vernier is only arranged, and the end face that this moment can formulation activity measuring jaw sliding sleeve (3) is an indicating positions that reads millimeter level integer.

Claims

1, a kind of by the main scale screw rod, movable measuring jaw sliding sleeve, the vernier caliper that microdrum is formed.It is characterized in that the concentric structure that the main scale screw rod screws with microdrum composition screw thread, and microdrum can be along main scale screw rod fast moving; Movable measuring jaw sliding sleeve has straight and two kinds of vernier grooves of curved surface; Microdrum has dynamometry control device and dust arrester, and measurement face wherein and internal thread are on same part.

2, by the described vernier caliper of claim 1, it is characterized in that the main scale screw rod is that an outer cylinder surface all is shaped on screw thread, scale mark plane and slide rail plane be at homonymy, recessed screw rod inside, be furnished with the fixedly threaded line pipe bar of measuring jaw.

3, by the described vernier caliper of claim 1, it is characterized in that the front of movable measuring jaw sliding sleeve has window, be shaped on straight and two kinds of vernier lines of curved surface to be furnished with movable measuring jaw.

4, by the described vernier caliper of claim 1, it is characterized in that microdrum forms concentric structure with internal thread with the main scale screw rod, and microdrum is under the effect of assigned direction pressure, can throw off inside and screw the differential nut of forming concentric structure mutually, so that it can be along main scale screw rod fast moving with the main scale screw rod; And the dust arrester of being furnished with the dynamometry control device and forming by cushion.

5, by claim 1,4 described vernier calipers, it is synthetic by differential nut and U-shaped slide block and groups of springs to it is characterized in that throwing off the concentric structure that screws; Be shaped on measurement face and measuring internal thread on the differential nut simultaneously.

6, by claim 1,2,3,4,5 described vernier calipers, the slide calliper rule that it is characterized in that to make right and wrong double vernier slide calliper rule or the curved surface vernier is only arranged.