CN221037143U - Tool set ruler for measuring and analyzing on-site dripping-shaped blood trace - Google Patents

Abstract

The utility model discloses a tool set ruler for measuring and analyzing on-site dripping-shaped blood traces, which comprises a measuring plate and a bent foot, wherein the measuring plate comprises a scale measuring area, a concentric circle measuring area and a round hole comparison area; the scale measuring areas are positioned at the upper edge and the lower edge of the measuring plate; the concentric circle measuring area is positioned at the left side of the measuring plate and consists of 7 concentric circles; the round hole comparison area is positioned on the right side of the measuring plate and consists of 15 round holes with different sizes; the bent feet are positioned at two ends of the bottom of the measuring plate. The tool set ruler for on-site dripping-shaped blood trace measurement and analysis can improve on-site blood trace analysis efficiency, can be used independently without high-end instruments and equipment, can be used together with a plurality of technical methods, and has very important effects on case analysis, on-site reconstruction and investigation direction definition.

Description

A tool set of rulers for measuring and analyzing dripping bloodstains on site

Technical Field

The utility model belongs to the field of criminal science and technology, and in particular relates to a tool set ruler used for on-site dripping blood stain measurement and analysis.

Background technique

Bloodstains are one of the most common trace evidences at the scenes of homicide and injury crimes. On-site bloodstain analysis helps investigators reconstruct the crime scene, quickly infer case information, accurately deploy defenses and controls, and effectively combat crimes.

The shape, size and distribution range of satellite bloodstains of dripping bloodstains are important reference indicators for bloodstain analysis, and are also the key to inferring reconstruction elements such as blood source location, dripping distance and carrier type. Within a certain height range, the shape, size and distribution of satellite bloodstains of dripping bloodstains are closely related to the volume of blood drops, dripping distance and the properties of the trace-bearing object. The larger the volume of the blood drop and the longer the dripping distance, the larger the area of the central bloodstain; the larger the dripping distance and the rougher the surface of the trace-bearing object, the more obvious the jagged protrusions of the central bloodstain; the larger the dripping distance, the easier it is for satellite bloodstains to form and the wider the distribution range. At present, there is no tool specifically used for on-site bloodstain measurement and analysis. Generally, investigators need to rely on experience to make simple analysis on the scene, use cameras to take pictures for evidence, form investigation records, and then return to the laboratory for detailed analysis and judgment; or use animal blood to conduct simulation experiments on the scene to infer parameters such as the volume and dripping distance of blood drops, and then reconstruct the crime scene. The above situation is usually time-consuming and labor-intensive, and requires high personal ability of the investigators. It is not conducive to rapid analysis at the crime scene and it is difficult to fully utilize the evidentiary value of bloodstains.

Utility Model Content

The purpose of the utility model is to solve the deficiencies of the above prior art and to provide a tool set of rulers for on-site dripping bloodstain measurement and analysis, which is suitable for a variety of scenarios and can quickly perform bloodstain morphology analysis and drip distance inference.

In order to achieve the above purpose, the technical solution adopted is:

A tool set ruler for on-site drip-shaped bloodstain measurement and analysis comprises a measuring plate and a bent foot, wherein the measuring plate comprises a scale measurement area, a concentric circle measurement area and a circular hole comparison area; the scale measurement area is located at the upper and lower edges of the measuring plate and is used to measure the length of traces or objects such as bloodstains; the concentric circle measurement area is located on the left side of the measuring plate and is composed of 7 concentric circles and is used to measure the number of saw teeth of the central bloodstain, the number of satellite bloodstains and the splashing distance; the circular hole comparison area is located on the right side of the measuring plate and is composed of 15 circular holes of different sizes and is used to compare the size of drip-shaped bloodstains formed by different blood drop volumes at different dripping distances; the bent feet are located at both ends of the bottom of the measuring plate and are used to support the measuring plate and can be placed above the bloodstain to avoid contamination of the bloodstain during measurement.

As another preferred embodiment of the present invention, the spacing between the four concentric circles inside the concentric circle measurement area is 0.5 cm, and the spacing between the three concentric circles outside is 1 cm, so as to conform to the distribution pattern of the jagged protrusions and satellite bloodstains.

As another preferred embodiment of the present invention, the diameters of the 15 circular holes in the circular hole comparison area are 12.3mm, 16.7mm, 18.2mm, 19.1mm, 20.4mm, 18.8mm, 25.7mm, 27.3mm, 28.5mm, 30.3mm, 20.7mm, 25.5mm, 30.2mm, 30.3mm and 31.1mm, respectively corresponding to the sizes of dripping bloodstains formed by three different blood drop volumes (45μl, 115μl and 125μl) at five different dripping distances (0.1m, 0.6m, 1.0m, 1.4m and 1.8m) when the bearing object is a ceramic tile. 45μl, 115μl and 125μl respectively correspond to the blood volumes in three common situations: blood dripping from human fingertips, blood dripping from metal objects and blood dripping from fabrics.

As another preferred embodiment of the present invention, the diameters of the 15 circular holes in the circular hole comparison area are 11.6mm, 16.4mm, 18.5mm, 18.7mm, 19.7mm, 19.5mm, 23.8mm, 27.7mm, 27.8mm, 28.5mm, 21.1mm, 25.6mm, 29.5mm, 29.5mm and 30.3mm, respectively corresponding to the sizes of dripping bloodstains formed by three different blood drop volumes (45μl, 115μl and 125μl) at five different dripping distances (0.1m, 0.6m, 1.0m, 1.4m and 1.8m) when the trace-bearing object is marble.

As another preferred embodiment of the present invention, the diameters of the 15 circular holes in the circular hole comparison area are 12.7mm, 16.5mm, 18.6mm, 18.8mm, 20.5mm, 19.6mm, 24.1mm, 25.8mm, 27.4mm, 27.7mm, 20.9mm, 26.3mm, 28.8mm, 30.1mm and 30.3mm, respectively corresponding to the sizes of drip-like bloodstains formed by three different blood drop volumes (45μl, 115μl, 125μl) at five different dripping distances (0.1m, 0.6m, 1.0m, 1.4m and 1.8m) when the trace-bearing object is granite.

As another preferred embodiment of the present invention, the diameters of the 15 circular holes in the circular hole comparison area are 11.6mm, 17.2mm, 20.3mm, 21.1mm, 21.9mm, 18.4mm, 24.8mm, 25.7mm, 28.0mm, 31.3mm, 20.2mm, 27.3mm, 28.7mm, 32.0mm and 33.2mm, respectively corresponding to the sizes of dripping bloodstains formed by three different blood drop volumes (45μl, 115μl, 125μl) at five different dripping distances (0.1m, 0.6m, 1.0m, 1.4m and 1.8m) when the bearing object is a cement brick.

As another preferred embodiment of the present invention, the diameters of the 15 circular holes in the circular hole comparison area are 15.3mm, 18.4mm, 18.4mm, 19.2mm, 19.5mm, 23.2mm, 25.0mm, 26.8mm, 27.0mm, 27.6mm, 23.3mm, 29.2mm, 29.2mm, 30.3mm and 31.1mm, respectively corresponding to the sizes of dripping bloodstains formed by three different blood drop volumes (45μl, 115μl, 125μl) at five different dripping distances (0.1m, 0.6m, 1.0m, 1.4m and 1.8m) when the bearing object is clay bricks.

As another preferred embodiment of the present invention, the height of the bent foot is 0.5-1 cm, and the angle between the bent foot and the measuring plate is 45°-75°, so that multiple tool rulers can be stacked together for easy carrying.

As another preferred solution of the present invention, the measuring plate and the bent feet are both made of transparent polypropylene.

Compared with the prior art, the tool set ruler for on-site dripping bloodstain measurement and analysis provided by the utility model has the following gain effects:

(1) The utility model can be quickly and efficiently applied to on-site bloodstain analysis, without requiring investigators to have too much theoretical knowledge and practical experience, thus greatly reducing the application threshold of bloodstain analysis technology;

(2) The utility model can reduce the analytical errors caused by empiricism, which may lead to misjudgment of the direction of investigation, and can improve the accuracy and reliability of the bloodstain drop distance and satellite bloodstain analysis at the scene;

(3) The utility model is easy to operate and carry, and is suitable for practical use by front-line public security investigators. The manufacturing process is simple, the cost is low, and it is easy to promote and popularize.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 is a schematic diagram of the structure of an embodiment of the utility model, Fig. 2 is a schematic diagram of the structure of a top view of an embodiment of the utility model, and Fig. 3 is a schematic diagram of the structure of multiple stacked embodiments of the utility model.

Among them: 1- measuring plate; 11- scale measuring area; 12- concentric circle measuring area; 13- circular hole comparison area; 2- bent foot.

Detailed ways

In order to better understand the present invention, the specific implementation methods of the present invention are further described in detail below in conjunction with the accompanying drawings.

Example 1

A tool set ruler for on-site dripping bloodstain measurement and analysis, comprising a measuring plate 1 and a bent foot 2, both of which are made of transparent polypropylene, the measuring plate 1 comprising a scale measurement area 11, a concentric circle measurement area 12 and a circular hole comparison area 13; the scale measurement area 11 is located at the upper and lower edges of the measuring plate 1, the concentric circle measurement area 12 is located on the left side of the measuring plate 1, and is composed of 7 concentric circles, the spacing between the inner 4 concentric circles is 0.5 cm, and the spacing between the outer 3 concentric circles is 1 cm; the circular hole comparison area 13 is located on the right side of the measuring plate 1, and is composed of 15 circular holes of different sizes, and the diameters of the 15 circular holes are 12.3 mm, 16.7 mm, 18.2 mm, 19.1 mm, 20.4 mm, 18.8 mm, respectively. , 25.7mm, 27.3mm, 28.5mm, 30.3mm, 20.7mm, 25.5mm, 30.2mm, 30.3mm, 31.1mm, which respectively correspond to the sizes of dripping bloodstains formed by 3 different blood drop volumes (45μl, 115μl, 125μl) at 5 different dripping distances (0.1m, 0.6m, 1.0m, 1.4m, 1.8m) when the bearing object is a tile; 45μl, 115μl and 125μl respectively correspond to the blood volumes in three common situations: blood dripping from human fingertips, blood dripping from metal objects and blood dripping from fabrics; the bent foot 2 is located at both ends of the bottom of the measuring plate 1, with a height of 0.6cm and an angle of 60° with the measuring plate 1.

As shown in Figures 1-2, when in use, Example 1 is placed above the bloodstain, and the length of the bloodstain or other traces or objects is measured through the scale measurement area 11; the number of serrations of the central bloodstain and the number of satellite bloodstains and the splashing distance are measured through the concentric circle measurement area 12. It can also be placed above the bloodstain to take pictures, and the serration shape of the bloodstain and the distribution of satellite bloodstains are recorded; the circular hole comparison area 13 is used to compare with the size of the dripping bloodstain, and the amount of blood and the dripping distance shown are inferred based on the circular holes in the comparison, and the type of the supporting medium and the dripping height before the blood drips are indicated, which is suitable for the scene when the trace-bearing object is a tile.

Embodiment 1 is convenient to use and simple to operate. It can not only quickly infer the approximate range of the dripping distance of the dripping bloodstain, but also measure and record the sawtooth shape and number of the central bloodstain and the number and distribution of the satellite bloodstains, and the conclusion can be drawn directly on site.

As shown in Figure 3, a plurality of tool rulers can be stacked together for easy carrying outside, and are suitable for practical use by front-line public security investigators.

Example 2

A tool set of rulers for on-site drip-like bloodstain measurement and analysis, the structure and dimensions of which are referenced to Example 1, and which differs from Example 1 in that the diameters of 15 circular holes in a circular hole comparison area 13 are respectively 11.6mm, 16.4mm, 18.5mm, 18.7mm, 19.7mm, 19.5mm, 23.8mm, 27.7mm, 27.8mm, 28.5mm, 21.1mm, 25.6mm, 29.5mm, 29.5mm, and 30.3mm, which respectively correspond to the sizes of drip-like bloodstains formed by three different blood drop volumes (45μl, 115μl, and 125μl) at five different dripping distances (0.1m, 0.6m, 1.0m, 1.4m, and 1.8m) when the trace-bearing object is marble. The tool set of rulers is suitable for the scene when the trace-bearing object is marble.

Example 3

A tool set of rulers for on-site drip-shaped bloodstain measurement and analysis, the structure and size of which refer to Example 1. The difference from Example 1 is that the diameters of 15 circular holes in the circular hole comparison area 13 are 12.7mm, 16.5mm, 18.6mm, 18.8mm, 20.5mm, 19.6mm, 24.1mm, 25.8mm, 27.4mm, 27.7mm, 20.9mm, 26.3mm, 28.8mm, 30.1mm, and 30.3mm, respectively corresponding to the sizes of drip-shaped bloodstains formed by three different blood drop volumes (45μl, 115μl, and 125μl) at five different dripping distances (0.1m, 0.6m, 1.0m, 1.4m, and 1.8m) when the trace-bearing object is granite. The tool set of rulers is suitable for the scene when the trace-bearing object is granite.

Example 4

A tool set of rulers for on-site drip-like bloodstain measurement and analysis, the structure and dimensions of which are referenced to Example 1. The difference from Example 1 is that the diameters of 15 circular holes in the circular hole comparison area 13 are respectively 11.6mm, 17.2mm, 20.3mm, 21.1mm, 21.9mm, 18.4mm, 24.8mm, 25.7mm, 28.0mm, 31.3mm, 20.2mm, 27.3mm, 28.7mm, 32.0mm, and 33.2mm, which respectively correspond to the sizes of drip-like bloodstains formed by three different blood drop volumes (45μl, 115μl, and 125μl) at five different dripping distances (0.1m, 0.6m, 1.0m, 1.4m, and 1.8m) when the trace-bearing object is a cement brick. The tool set of rulers is suitable for the scene when the trace-bearing object is a cement brick.

Example 5

A tool set of rulers for on-site drip-like bloodstain measurement and analysis, the structure and dimensions of which are referenced to Example 1. The difference from Example 1 is that the diameters of 15 circular holes in the circular hole comparison area 13 are respectively 15.3mm, 18.4mm, 18.4mm, 19.2mm, 19.5mm, 23.2mm, 25.0mm, 26.8mm, 27.0mm, 27.6mm, 23.3mm, 29.2mm, 29.2mm, 30.3mm, and 31.1mm, which respectively correspond to the sizes of drip-like bloodstains formed by three different blood drop volumes (45μl, 115μl, and 125μl) at five different dripping distances (0.1m, 0.6m, 1.0m, 1.4m, and 1.8m) when the trace-bearing object is a clay brick. The tool set of rulers is suitable for the scene where the trace-bearing object is a clay brick.

The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims (9)

1. The tool set ruler for measuring and analyzing the on-site dripping-shaped blood trace is characterized by comprising a measuring plate and a bent foot, wherein the measuring plate comprises a scale measuring area, a concentric circle measuring area and a round hole comparison area;

The scale measuring areas are positioned at the upper edge and the lower edge of the measuring plate and are used for measuring the length of traces or objects such as blood stains;

The concentric circle measuring area is positioned at the left side of the measuring plate and consists of 7 concentric circles and is used for measuring the number of saw teeth of the central blood trace, the number of satellite blood traces and the splashing distance;

The round hole comparison area is positioned on the right side of the measuring plate and consists of 15 round holes with different sizes and is used for comparing the sizes of dripping-shaped blood stains formed by different blood drop volumes at different dripping distances;

the bent feet are positioned at two ends of the bottom of the measuring plate and used for supporting the measuring plate.

2. The kit for on-site drop-like blood measurement and analysis of claim 1, wherein the concentric circle measuring region has a pitch of 0.5cm for the inner 4 concentric circles and a pitch of 1cm for the outer 3 concentric circles.

3. A kit for on-site drop-like blood measurement and analysis as set forth in claim 1, wherein said 15 circular hole diameters of said circular hole alignment areas are respectively 12.3mm、16.7mm、18.2mm、19.1mm、20.4mm、18.8mm、25.7mm、27.3mm、28.5mm、30.3mm、20.7mm、25.5mm、30.2mm、30.3mm、31.1mm.

4. A kit for on-site drop-like blood measurement and analysis as set forth in claim 1, wherein said 15 circular hole diameters of said circular hole alignment areas are respectively 11.6mm、16.4mm、18.5mm、18.7mm、19.7mm、19.5mm、23.8mm、27.7mm、27.8mm、28.5mm、21.1mm,25.6mm、29.5mm、29.5mm、30.3mm.

5. A kit for on-site drop-like blood measurement and analysis as set forth in claim 1, wherein said 15 circular hole diameters of said circular hole alignment areas are respectively 12.7mm、16.5mm、18.6mm、18.8mm、20.5mm、19.6mm、24.1mm、25.8mm、27.4mm、27.7mm、20.9mm、26.3mm、28.8mm、30.1mm、30.3mm.

6. A kit for on-site drop-like blood measurement and analysis as set forth in claim 1, wherein said 15 circular hole diameters of said circular hole alignment areas are respectively 11.6mm、17.2mm、20.3mm、21.1mm、21.9mm、18.4mm、24.8mm、25.7mm、28.0mm、31.3mm、20.2mm、27.3mm、28.7mm、32.0mm、33.2mm.

7. A kit for on-site drop-like blood measurement and analysis as set forth in claim 1, wherein said 15 circular hole diameters of said circular hole alignment areas are respectively 15.3mm、18.4mm、18.4mm、19.2mm、19.5mm、23.2mm、25.0mm、26.8mm、27.0mm、27.6mm、23.3mm、29.2mm、29.2mm、30.3mm、31.1mm.

8. The kit for on-site drop-like blood measurement and analysis of claim 1, wherein the bent feet have a height of 0.5-1cm and an angle of 45 ° -75 ° with the measuring plate.

9. The tool set for in-situ drop-like blood measurement and analysis of claim 1, wherein said measuring plate and said bent feet are both made of transparent polypropylene.