JP3064891U - Equipment for measuring friction characteristics of footwear, etc. - Google Patents

Abstract

(57) [Summary] [Problem] To be able to specify the friction characteristics of the entire bottom surface of footwear, etc., to apply a load to footwear, etc. equivalent to that when actually worn, Provided is an apparatus capable of measuring a friction characteristic with a floor material in a typical surface state (a state in which inclusions such as water, oil, sand, and the like are present) with high accuracy, with good reproducibility, and efficiently in large quantities. SOLUTION: Footwear is attached to an artificial foot, an air cylinder is actuated, a vertical load of a constant pressure is applied using a load cell to make contact with a specimen container, and then a gear motor is operated to move the specimen container backward. And a device configured to continuously measure resistance due to friction using a load cell.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a device for measuring friction characteristics of a bottom surface of footwear or the like. More specifically, the friction characteristics such as the coefficient of friction, the coefficient of slip, and the momentum of friction loss on the bottom surface of footwear and the like are measured accurately, with good reproducibility, and efficiently. The present invention relates to an apparatus for measuring frictional characteristics of footwear and the like that enables relative comparison of characteristics.

[0002]

[Prior art]

 Conventionally, a slip test specimen from which a part of the sole was cut off was pulled diagonally upward using a floor material slip tester, and the slip resistance coefficient of the floor was determined from the maximum tensile load and vertical load (for example, Eno Ono) Architectural Institute of Japan Transactions No. 346, pp. 1-8, 1984). Although this method is excellent for measuring the sliding characteristics of flooring materials, the friction characteristics of actual footwear are greatly affected by not only the material of the footwear but also the design of the bottom surface of the footwear. In such cases, it is desirable to measure the friction characteristics of the entire bottom surface of the footwear.

Further, a device for measuring a coefficient of friction by pulling a shoe sole horizontally with respect to a floor (for example, Japanese Unexamined Patent Publication No. Hei 8-313427, Japanese Patent No. 2775408) is known. This device is excellent in that it can measure the coefficient of friction between members such as roads and floors, or ice and snow and the bottom surface of footwear, etc. If a difference occurs and a load is used instead of being worn by humans, improvement that applies the same load to footwear as when actually worn is desired.

[0004] Further, a method of horizontally pulling a floor against a shoe sole to obtain a dynamic friction coefficient (for example, Hisao Nagata, Research Report of the Institute of Industrial Safety RIIS-RR-90, pp33-40, 1990) is also known. Have been. This method is excellent in that it can measure the friction characteristics of the entire bottom surface of footwear, etc. and can apply the same load to footwear, etc. as when actually worn. It is possible to measure the frictional characteristics of typical surface conditions (with water, oil, sand, and other inclusions) with the flooring material. There is a further need for possible improvements.

[0005]

[Problems to be solved by the invention]

 The present invention can measure the friction characteristics of the entire bottom surface of footwear, etc., can apply the same load to the footwear, etc. as when actually worn, and can represent the bottom surface of the footwear, etc. and a typical surface condition (water The present invention provides a device capable of measuring friction characteristics with a floor material in a state in which there are inclusions such as oil and sand) with high accuracy, good reproducibility and efficiently in large quantities.

[0006]

[Means for Solving the Problems]

 The present invention solves the above-mentioned problem, and the device comprises an operating part A at a rear part on the upper surface of a flat rectangular bottom plate 1, a test table part B at a front part, and a sample at a central part. A fixed portion C is disposed, and the operating portion A includes a support frame 2 erected on a central portion of the upper surface of the bottom plate 1, a feed screw 3 rotatably supported in the support frame 2, and a feed screw 3. The test stand B is composed of a traveling nut 5 fitted with the feed screw 3 and a load cell 6. The sample fixing portion C comprises a column 8 and a positioning nut 21 fixed to the flat rectangular bottom plate 1. With the square bottom plate 1 An air cylinder 11 fixedly mounted on a small gantry 23 held by a column 22 with a cylinder shaft 10 facing downward above a gantry 9 variably held in a row and in a vertical direction, and connected to the cylinder shaft 10. A main rod 15 which is connected downward through a metal fitting 12 and a load cell 13 and is vertically movably supported in a guide cylinder 14 which is vertically fixed above the gantry 9 and is detachably attached to the main rod 15. A guide rail 17 is fixedly provided on the lower surface of the specimen container 7 in parallel with the longitudinal direction thereof, and a guide roll 18 for guiding the guide rail 17 has a flat rectangular shape. A plurality of test pieces are provided at intervals in the longitudinal direction of the upper surface of the bottom plate 1, and the front end or the rear end of the lower surface of the test specimen container 7 is formed on the upper surface of the flat rectangular bottom plate 1. The microswitch 19 or behind the micro switch 20 of a frictional characteristic measuring apparatus of shoes, etc. that are configured to disengage.

[0007]

[Embodiment of the invention]

 The present invention works as follows. In the friction characteristic measuring apparatus of the present invention, the specimen container 7 itself corresponds to a floor material or the like, and in order to reproduce a typical surface state of the floor material or the like, inclusions such as water, oil, sand and the like are included. Apply or spray. Footwear or the like is attached to the artificial foot 16, the air cylinder 11 is operated, and a vertical load with a constant pressure is applied using the load cell 13 to make contact with the specimen container 7. Next, the gear motor 4 is operated, the specimen container 7 is moved backward, and the resistance due to friction is continuously measured using the load cell 6.

[0008]

【Example】

 Embodiments will be described with reference to the drawings. Reference numeral 1 denotes a flat rectangular bottom plate for loading the operating section A, the test table section B, and the sample fixing section C, and may be mounted on a work table or a trolley to facilitate the measurement operation. . Reference numeral 2 denotes a support frame which stands upright at the center of the upper surface of the bottom plate 1 and rotatably supports the feed screw 3 with a bearing or the like. Reference numeral 3 denotes a feed screw, which is provided at its rear end and rotated at a constant rotation speed by a gear motor 4 whose rotation is controlled by an inverter. The feed screw 3 and the gear motor 4 are connected via an electromagnetic clutch 24 and are closed at the start of measurement to transmit the driving force of the gear motor 4 to the feed screw 3. The measurement can be performed accurately by starting a continuous measurement of the drag force generated by the friction between the footwear and the like described below and the flat rectangular test specimen container 7 in synchronization with the electric signal for closing the electromagnetic clutch. .

Reference numeral 5 denotes a traveling nut which is fitted to the feed screw 3 and functions to advance or retreat the flat rectangular test specimen container 7. It is desirable that the moving speed can be up to 30 cm / sec (18 m / min). Reference numeral 6 denotes a load cell, which continuously measures a resistance force caused by friction generated between footwear or the like and a flat rectangular container 7. Desirably, the resistance can be measured up to 2,000 N (about 200 kg). Resistance is measured electrically and sent to a computer for data processing. Reference numeral 7 denotes a flat rectangular test container made of mirror-finished stainless steel. By defining the surface state such as the roughness of the test sample container 7, the friction characteristics can be measured with good reproducibility and high accuracy. The test container 7 is in the form of a tray. If necessary, a liquid such as water, oil, glycerin or the like is applied or poured into the tray, or a solid such as sand is sprayed on the tray, and the actual condition of the floor, road surface, etc. Is reproduced as a model. By specifying the composition, purity, particle size, and measurement environment conditions of the inclusions to be used, the friction characteristics can be measured with good reproducibility and high accuracy. In addition, it is easy to change the liquid or solid that is the test sample and to clean the test sample container. A guide rail 17 is fixedly provided on the lower surface of the test sample container 7 in parallel with its longitudinal direction, and a guide roll 18 for guiding the guide rail 17 is spaced apart in the longitudinal direction of the upper surface of the flat rectangular bottom plate 1. A plurality of test specimen containers 7 can be moved forward or backward in parallel with the longitudinal direction of the flat bottom plate 1. The front end or the rear end of the lower surface of the test container 7 is configured to be disengaged with the front microswitch 19 or the rear microswitch 20 protruding from the upper surface of the flat rectangular bottom plate 1 with the movement thereof. , And controls the completion position of the forward or backward movement of the specimen container 7. The test specimen container 7 is positioned at the front portion of the flat rectangular bottom plate 1 before the measurement of the frictional resistance, is moved backward when the frictional resistance is measured, and is automatically and quickly moved again to the front portion at the end of the measurement. be able to. When the size of the test container 7 is, for example, 300 mm × 300 mm, the moving distance of the test container 7 is desirably about 600 mm. The measurement time is 2 seconds in this case.

Reference numeral 9 denotes a gantry, which guides an air cylinder 11 and a guide cylinder 14 which is connected to the cylinder shaft 10 of the cylinder 10 below via a connection fitting 12 and a load cell 13 and which is fixed vertically above the gantry 9. The main rod, which is supported to be able to move up and down, is loaded and suspended. The upper and lower positions can be fixed up and down by a support post 8 having a screw fixed to the flat rectangular bottom plate 1 and a positioning nut 21, and can be fixed in parallel with the flat rectangular bottom plate 1. Reference numeral 11 denotes an air cylinder which is installed on a small gantry 23 held by a column 22 with its cylinder shaft 10 facing downward. A pressure-controlled compressed air is supplied to the air cylinder 11, and the air cylinder 11 is connected to a cylinder shaft 10 through a connection fitting 12 and a load cell 13, and is vertically fixed above a mount 9 in a guide cylinder 14. A constant vertical load is applied to the artificial foot 16 via the main rod 15 supported vertically. The applied vertical load is measured electrically and sent to a computer for data processing. It is desirable that the vertical load applied by the air cylinder can be applied up to 1,000 N (about 100 kg). Usually, it is set to 500N. At the end of the measurement, the artificial leg 16 can be automatically moved upward by the air cylinder 11 in a short time. It is desirable to use a prosthetic foot as an artificial foot, but it is also possible to use a split and modeled version.

In the measurement of the friction characteristics, the frictional resistance with respect to the moving distance (or moving time) of the test container is continuously measured. The coefficient of frictional resistance can be determined from the ratio of the measured frictional resistance to the vertical load. The slip resistance coefficient can be obtained from the ratio of the maximum value of the frictional resistance to the vertical load. Further, the frictional loss momentum can be obtained by integrating the frictional resistance against the moving distance. The relationship between each friction characteristic and the actual phenomenon is that the coefficient of friction is easy to control while slipping, the coefficient of sliding resistance is the degree of staying without slipping, and the force of kicking up when walking. It is thought that the degree of transmission of friction and the momentum of friction loss are related to the braking distance from the moving state.

Next, an example of a measurement result of an actual product will be described. The measurement was repeated three times for each of three pairs of men's shoes having rubber soles of different designs, two pairs of boots, one pair of work shoes, one pair of safety shoes, and two pairs of special use shoes. The test specimens were ion-exchanged water, glycerin, and engine oil. When ion-exchanged water was used as the test body, the average variation rate of the frictional resistance coefficient was 11. 76%, and the correlation coefficients between the respective measurement times were 0.9870, 0.9824, and 0.9988. In addition, the fluctuation rate of the slip resistance coefficient was 9.74% on average, and the correlation coefficients between the number of measurements were 0.9888, 0.9643, and 0.9828. The average variation rate of the integrated value was 8.88%, and the correlation coefficients between the respective measurement times were 0.9870, 0.9802, and 0.9959. The same test was performed for glycerin and engine oil, and the correlation coefficients between ion-exchanged water and glycerin, ion-exchanged water and engine oil, and glycerin and engine oil were determined. .2168, 0.6608, 0.7648, and 0.0815, 0.7565, 0.3230 for the slip resistance coefficient, and 0.2764, 0.7553, respectively for the integrated value. It was 0.7268, indicating that the correlation was low and the difference between the test specimens could be measured.

[0013]

[Effect of the invention]

 Since the present invention is configured as described above, it is possible to measure the friction characteristics of the entire bottom surface of practical footwear and the like, and it is possible to apply the same load to the footwear and the like as when actually worn. Measurement of friction characteristics between the bottom surface of footwear, etc. and the floor material in a typical surface condition (including water, oil, sand, etc.) with high accuracy, good reproducibility and efficiency It can be performed efficiently in large quantities.

[Brief description of the drawings]

FIG. 1 is a front view of an apparatus for measuring friction characteristics of footwear and the like.

FIG. 2 is a side view of an apparatus for measuring friction characteristics of footwear and the like.

[Explanation of symbols]

 A Working part, B Test stand part, C Sample fixing part, 1 Bottom plate, 2 Support frame, 3 Feed screw, 4 Gear motor, 5 Traveling nut, 6 Load cell, 7 Specimen container, 8 Prop, 9 Mount, 10 Cylinder shaft , 11 air cylinders, 12 connection fittings, 13 load cells, 14 guide cylinders, 15 main rods, 16 artificial feet, 17 guide rails, 18 guide rolls, 19, 20 microswitches, 21 nuts, 22 columns, 23 gantry, 24 electromagnetic clutch

Claims (1)

[Utility model registration claims] 1. An operating portion (A) is provided on a rear portion of an upper surface of a flat rectangular bottom plate (1), a test table portion (B) is provided on a front portion, and a sample fixing portion (C) is provided on a central portion. The operating portion (A) is provided with a support frame (2) standing upright at the center of the upper surface of the bottom plate (1), and a feed screw (3) rotatably supported in the support frame (2). , This feed screw (3)
And a gear motor (4) for rotationally driving a feed screw connected to the rear end via an electromagnetic clutch (24), and the test stand (B) has a traveling nut fitted with the feed screw (3). (5) a flat rectangular specimen container (7) having a rear end connected via a load cell (6) and movable parallel to a flat rectangular bottom plate (1) backward, and a sample fixing portion (C) shows a gantry (9) in which a column (9) fixed to a flat rectangular bottom plate (1) and a positioning nut (21) variably hold the position in the vertical direction in parallel with the flat rectangular bottom plate (1). ), An air cylinder (11) fixedly mounted on a small gantry (23) held by a column (22) with the cylinder shaft (10) facing down;
A guide cylinder (14) which is connected downward to the cylinder shaft (10) via a connection fitting (12) and a load cell (13) and is fixed vertically above the mount (9) so as to be vertically movable. Supported main rod (1
5) An artificial foot (16) detachably connected to the main rod (15), and a guide rail (17) is fixed to the lower surface of the specimen container (7) in parallel with the longitudinal direction thereof. A plurality of guide rolls (18) for guiding the guide rails (17) are provided at intervals in the longitudinal direction of the upper surface of the flat rectangular bottom plate (1), and the front end of the lower surface of the specimen container (7) is provided. Or the rear end is a flat square bottom plate (1)
A friction characteristic measuring device for footwear or the like, characterized in that the friction characteristic measuring device is configured to be engaged and disengaged with a front micro switch (19) or a rear micro switch (20) protruding from an upper surface of the shoe.