JPH087111B2 - Furniture strength tester - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention improves the strength, durability, safety, etc. of furniture by applying loads such as loads and impacts to furniture such as desks, tables, chairs, and closets. The present invention relates to a furniture strength tester for testing.

[Prior Art] Generally, as a test method for the strength of furniture such as a chair or a desk, for example, a repeated load is applied from above, a lateral load is repeatedly applied, or a weight or the like is dropped from a certain distance. A shock from above or a hammer-like pendulum, etc. is drawn in an arc and dropped to give a shock from the lateral direction to apply a load to break, damage, detach, deform, residual strain,
I was testing that there was no wobble. Also,
These test methods are specified in JIS standards and the like.

Conventionally, as a furniture strength tester for performing these tests,
For example, a base on which furniture or the like is placed or fixed, four columns that are erected at the four corners of the base, beams that connect these columns, and a frame body that includes the columns and the beams are horizontal to the furniture. A loading device for applying a load such as a shock or a load from a vertical direction or a vertical direction was attached via a mounting member.

And, when using such a testing machine, by setting the furniture on the base, by applying a load to the furniture from the loading device attached to the furniture strength testing machine via a mounting member. It was being done.

[Problems to be Solved by the Invention] By the way, in the above-mentioned furniture strength testing machine, the furniture is put into a frame body composed of columns and beams to perform a test. However, in a furniture strength tester that can handle comparatively small furniture such as chairs, the columns for mounting the loading device interfere with setting the conference table or large desk on the base. However, there was a problem that the test could not be carried out.

Also, in the strength test of desks and chairs with armrests, there are tests such as applying a load from the side, and at this time, attach an arm that receives this load from the opposite side to which the load is applied, or both The test may be carried out by simultaneously or alternately applying a load to the armrests. Therefore, if there are columns or beams for attaching loading devices to set large furniture on the base only on one side of the base, load is applied from both sides of the furniture like this. There is a problem that such a test cannot be performed.

Furthermore, when a furniture strength tester is set up to fit a large piece of furniture, when furniture such as a chair is set, the furniture becomes distant from the frame consisting of columns and beams, and the loading device is set. There is a problem that you cannot do it.

Also, with a large furniture strength testing machine, when testing the furniture, the places where the furniture strength testing machine can be installed are limited, so move the furniture to the location where the furniture strength testing machine is located,
There was a problem that it was time-consuming to test furniture. Therefore, there is a furniture strength tester that is small enough to be installed in an empty space such as a furniture production site or a warehouse, or that can be easily moved and that can perform various tests that apply loads such as loads and impacts. Was wanted.

The present invention has been made in view of the above circumstances, and an object thereof is to perform a strength test from a relatively small furniture such as a chair to a large furniture such as a conference table, and an apparatus. An object of the present invention is to provide a furniture strength tester that can be made small in size as a whole and can perform various tests that apply loads such as load and impact to furniture.

[Means for Solving the Problem] In order to achieve such an object, the furniture strength tester of the present invention is a furniture strength tester for testing the strength by applying a load such as a load to furniture. A rectangular base on which furniture is placed, and three columns that are erected at three corners of the four corners on the base,
Two support beams connecting the upper ends of these columns along the sides of the base, and horizontally extending from the respective upper ends of the columns toward the center of the base, and of the center of the base. A loading device mounting arm that is connected to each other at a connection portion, and a loading device mounting that is detachably attached to the support beam at the upper end and at the lower end corresponding to the upper end on the side surface of the base. A loading side plate, which is hung on the loading device mounting arm and which applies a vertical load to the furniture, and is mounted on the loading device mounting side plate, and A second loading device that applies a horizontal load to the furniture, and an auxiliary column for receiving the load of the second loading device is detachably attached to the position facing the loading device mounting side plate. Is characterized by It is intended.

[Operation] According to the above configuration, when a strength test or the like of a small furniture such as a chair is performed, the chair is set on the base with the auxiliary columns attached. In addition, first and second loading devices such as a cylinder device for loading the furniture are attached to the loading device mounting arm and the loading device mounting side plate in advance,
The furniture is tested from the sides and from above. At this time, the auxiliary column can receive the load applied to the furniture from the second loading device from the opposite side, and can apply the load due to the reaction force to the furniture from the opposite side of the second loading device.

When testing large furniture such as a conference table, remove the auxiliary columns, leave the two sides of the base other than the columns and support beams open, and insert furniture from these sides. The furniture can be loaded.

Embodiments Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 8 are drawings showing an embodiment of the present invention, and a furniture strength tester A of this embodiment is a rectangle on which furniture is placed, as shown in FIG. 1 and FIG. Base 1
And three pillars 2 standing upright at three corners 1d of the four corners 1d on the base 1, and upper ends 2a of these pillars 2, 2, 2 along the side surface of the base 1. The two support beams 3 and 3 connected to each other and the respective upper ends 2a, 2a, 2a of the columns 2, 2, 2 are horizontally extended toward the center of the base 1, and the base 1
Loading device mounting arms 4, 4, 4 which are connected to each other at the central connecting portion 4a, and a base whose upper end is detachably attached to the supporting beams 3, 3 and whose lower end corresponds to the upper end. And a side plate 5 for mounting a loading device which is detachably mounted on one side surface, and the loading device mounting arm 4 is provided.
A first loading device 6 which is vertically installed on the furniture and applies a vertical load to the furniture, and a second loading device which is attached to the loading device mounting side plate 5 and applies a horizontal load to the furniture. 7, and an auxiliary column 8 for receiving the load of the second loading device 7 is detachably attached at a position facing the loading device mounting side plate 5.

Next, the furniture strength tester A of this embodiment will be described in detail.

The base 1 has a rectangular frame 1b formed by a rectangular steel pipe 1a.
Is assembled, auxiliary beam members (not shown) are assembled inside the frame body 1b in a grid pattern, and the bottom plate 1c is provided on the auxiliary beam members. Then, a corner 1d of the frame body 1b is provided with a flanging portion 1e for vertically setting the support column 2 so that the lower end of the support column 2 can be fastened with a bolt. Also, the frame body
A flange is also formed in the center of the rectangular steel pipe 1a that constitutes one side of 1b.
1f (shown in FIG. 3 etc.) is provided so that the lower end of the auxiliary column 8 can be fastened by bolts to stand upright.

Further, on the upper surfaces of the two steel pipes 1a facing each other of the frame body 1b,
Each row has a plurality of bolt insertion holes 1g, 1g (only one row is shown in Fig. 2), and the bottom surface of the furniture is the bottom plate 1c.
A restraining plate 1h (shown in FIG. 3 and the like) for stopping the upper portion from slipping is hung on the two steel pipes, and both ends of the restraining plate 1h can be fastened with bolts.

Then, casters 1i (shown in FIG. 3 and the like) for moving the furniture strength tester A are provided at four corners on the back surface of the base 1. A foot 1j for fixing the base 1 is screwed to a position adjacent to the caster 1i, and the foot 1j is rotated to project below the caster 1i to perform a furniture strength test. Machine A is fixed.

An auxiliary base 9 (shown in FIG. 8) for enlarging the base 1 can be connected to one side of the base 1 when a large piece of furniture is placed.

The pillar 2 is made of a rectangular steel pipe, and a pillar flange portion 2b for fastening to the base 1 is provided at a lower end portion thereof, and a support beam 3 and a loading device mounting arm 4 are fastened to an upper end portion 2a. A flange portion 2c is provided. The support columns 2 are erected on the flanges 1e of the three corners 1d of the four corners 1d of the base 1 with the support column flanges 2b provided at the lower ends of the support columns 2 fastened by bolts. ing.

The support beams 3 are made of rectangular steel pipes and are provided along the side surfaces of the base 1 so as to connect the upper ends 2a of the three columns 2 to each other. That is, the two support beams 3 are welded at right angles to each other, and the flange portion 3a is provided at the welded portion and the remaining two ends, and the flange portion 2c of the upper end portion 2a of the column 2 is bolted. It has been concluded.

The arms 4 extend horizontally from the upper ends 2a of the columns 2 toward the center of the base 1, and the arms 4 are connected to each other at the center of the base 1. That is, the first arm square steel pipe 4b is arranged along the diagonal line of the base 1 so as to connect the flange portions 3a at both ends of the welded support beam 2, and both ends thereof are provided at the flange portion 3a of the support beam 3. While being welded, the second arm square steel pipe 4c is arranged so as to connect the central portion of the first arm square steel pipe 4b and the welded portion of the support beams 3 to each other, and both ends thereof are respectively
It is welded to the central part of the first arm rectangular steel pipe 3a and the welded part between the support beams 3.

A flange for connecting the first loading device 6 for applying a load from above to the furniture is attached to the lower surface of the connecting portion 4a of the first arm square steel pipe 4b and the second arm square steel pipe 4c. A section 4d is provided. Further, on the upper surface of the connecting portion 4a, a flange portion 4e for extending from the upper end portion of the auxiliary strut 8 and for fastening an auxiliary beam 8a for supporting the upper end of the auxiliary strut 8e.
Is provided.

The auxiliary column 8 is erected by a flange 1f provided at the center of the steel pipe 1a constituting the base 1 being fastened to a flange 8b provided at the lower end of the auxiliary column 8. ing. As described above, the auxiliary beam 8a extending from the upper end of the auxiliary column 8 toward the flange portion 4e on the upper surface of the connecting portion 4a is provided to support the upper portion of the auxiliary column 8. Further, a load receiving arm 8b for receiving the load applied by the second loading device 7 provided at the opposite position is attached to the auxiliary column 8. Note that the second loading device 7 may be attached to the auxiliary column 8.

A plurality of insertion holes 3b, 1k for inserting bolts are provided in two rows on the side surfaces of the support beam 3 and the base 1.
The loading device mounting side plate 5 including the two rectangular steel pipes 5a is configured to be fastened at its upper and lower ends with bolts at arbitrary positions where the front insertion holes 3b and 1k are provided.

A plurality of through holes 5b for bolts (shown in FIG. 3 and the like) are provided in a row at predetermined intervals in the square steel pipe 5a constituting the side plate 5, and a loading device mounting member 5c is mounted at an arbitrary height. It can be fixed to the height. Then, the second loading device 7 is attached to the loading device mounting member 5c.

As the first loading device 6, as shown in FIG. 1 and the like, as shown in FIG. 5 and the X-axis cylinder device 10 for applying a load from above to the seat plate of the chair by the air cylinder 10a. The falling part 11a is allowed to fall naturally so that the seat plate 20c of the chair 20
A pendulum type impact device 11 that applies an impact from above and a hammer type pendulum 12a is struck in an arc as shown in FIG. There are devices 12 and the like.

Further, as the second loading device 7, as shown in FIG. 1 and the like, a Y-axis cylinder device 13 in which an air cylinder 10a for applying a load is provided in a substantially horizontal direction similarly to the first loading device is provided. There is.

The X-axis cylinder device 10 is mounted on the loading device mounting arm 4 so that a load is applied from above, and the Y-axis cylinder device 13 is mounted on the loading device mounting side plate 5.
It is attached to and loaded from the side.

These cylinder devices 10 and 13 are composed of an air cylinder 10a and a piston rod 10b, and are operated by supplying air from an air compressor (not shown) via a solenoid valve (not shown). And piston rod
A pad 17 for pressing is attached to the tip of 10b according to the furniture to be loaded.

The solenoid valve is controlled by the repetitive control device 14 shown in FIG. That is, personal computer 15
Based on parameters such as the load by the cylinder devices 10 and 13 input from the keyboard 15a, the time to apply the load, and the number of times the load is repeatedly applied, the repetitive control device 14 controls the operation of the solenoid valve to operate the cylinder devices 10 and 13. It is designed to let you.

In addition, the cylinder devices 10 and 13 are provided with a rod 10c that is arranged in parallel with the piston rod 10b and that moves in conjunction with the piston rod 10b, and a displacement sensor 10d that measures the amount of forward and backward movement of the rod 10c is provided. Has been. A strain sensor 10e is provided at the tip of the piston rod 10b to measure the axial strain of the furniture piston rod 10b when a load is applied to the furniture by the piston rod 10b. The signals from these sensors 10d and 10e are
The data sent to the digital strain measuring machine 16 and obtained by this digital strain measuring machine 16 is stored online in a personal computer.
It is sent to 15 for analysis. The data and analysis result sent to the personal computer 15 are output to the display 15b and the printer 15c.

Further, the furniture strength tester of this embodiment is adapted to the chair strength test method of the International Organization for Standardization (hereinafter referred to as ISO) as a load test by the cylinder devices 10 and 13. In other words, one of the ISO chair test methods is to apply a load from above to the seat plate of a chair in order to repeatedly apply a load that is almost the same as when a person sits down on a chair. There is one that repeats this by applying a load to the backrest from the front.

Hereinafter, the loading device 19 that automatically applies repeated loads in accordance with the ISO test method will be described.

As shown in FIG. 3, etc., the X-axis cylinder device 10
And a side plate 5 for mounting the loading device is provided on the front surface of the chair 20, and the Y-axis cylinder device 13 is provided on the side plate 5.
Is provided.

Then, a seat plate pad 17a having a thigh-shaped bottom surface that abuts against the seat plate 20c and applies a load is attached to the tip of the piston rod 10b of the X-axis cylinder device 10 so as to be rotatable in the front-back direction with respect to the chair 20. Has been.

And the piston rod 10b of the Y-axis cylinder device 13
Is the piston rod 10b of the X-axis cylinder device 13.
Is separated into two rods 13a (only the front side rod 13a is shown in FIG. 3). A backrest pad 17b is attached to the tips of these rods 13a so as to be vertically rotatable. Further, at the tip of the rod 13a, support pieces 13b, 13b rotatably mounted in the longitudinal direction of the rods 13a, 13a are attached to the seat plate pad 17a rearward from the mounting position of the pistol rod 10b so as to be rotatable in the front-back direction. It is rotatably attached.

This support piece 13b is provided with a slit 13c in its axial direction, and a stopper 13d protruding from the tip of the rod 13b is inserted into the slit 13c so that the support piece 13c and the rod 13b are rotatably connected. With slit 13c
The inclination of the seat pad 17a can be adjusted by shifting the stopper 13d along the direction.

Then, by the support piece 13c, the Y-axis cylinder device 1
When a load is applied to the backrest 20b by 3, the inclination of the seat plate pad 17a is such that the rear end of the seat plate pad 17a is lowered, and the load applied to the chair 20 from the seat plate pad 17a. The center of gravity of the piston rod of the X-axis cylinder device 10
It is designed to move rearward from the mounting position of 10b.

A drop type impact device which is one of the first loading devices 6.
11 is a pad that is attached to the loading device mounting arm 4 and gives a shock by directly contacting furniture.
11b and a falling portion 11a composed of a weight 11c for applying an impact force at the time of dropping, a guide rail 11d for guiding the falling portion 11a so as not to prevent natural falling, and a guide rail 11
It comprises a positioning part 11e which is slidably guided by and fixed at a predetermined position and which determines the drop height of the drop part.

Four coil springs that adjust the impact force of the pad 11b and the weight portion 11c on the drop portion 11a and prevent the drop portion 11a from bouncing and impacting the furniture again after the drop portion 11a collides with the furniture. It is connected by the section 11f.

Further, a guide portion 11g guided by the guide rail 11d is provided above the weight portion 11c of the falling portion 11a. On the upper surface of the guide portion 11g, a hooking piece 11h that is hooked on the positioning portion 11e is provided.

Then, the hooking piece 11 of the falling portion 11a is attached to the positioning portion 11a.
A hanging piece 11i is provided to hang the falling part 11a while h is detachably applied. This lifting piece 11i
Is a positioning part 1 that can be rotated so that the hook 11h can be removed.
It is pivotally supported by 1e.

The pendulum type impact device 12 is attached to the loading device attachment arm 4 and applies an impact to the backrest 20b or the like of the chair 20 from the lateral direction.

As shown in FIG. 7, the pendulum type impact device 12 is made of a rectangular steel pipe, and is attached to the loading device attachment arm 4 and the like, and an attachment part 12b and about 1/4 of the attachment part 12b. An angle determining portion 12c formed in an arc shape, a shaft portion 12e whose upper end is rotatably supported by a mounting portion 12b, and this shaft portion 12
and a pendulum portion 12a provided at the lower end of e and provided with a hammer portion 12f that collides with the furniture and gives a shock.

The angle determining portion 12c is provided with a scale indicating an angle, and a stopper 12g that is guided by the angle determining portion 12c and can be fixed at any position is provided. I'm supposed not to go to.

The impact devices 11 and 12 can be manually operated, and can also be automatically operated by setting a lifting device (not shown) including a drive motor or the like.

Next, using the furniture strength tester with the above configuration,
The case of testing the strength, durability, safety, etc. of furniture will be described.

For example, in the case of carrying out a test in which a load is attached to the chair 20, first, the chair 20 is placed on the base 1, and the restraining plates 1h are attached to the front and the back of the chair 20 and set. And the chair
About the seat plate 20c of 20, by the X-axis cylinder device 10,
Repeated load is applied from above. Further, regarding the armrest 20a and the backrest 20b of the chair 20, the Y-axis cylinder device 13
Repeatedly apply a load from the side or front. Further, when a load is applied to one armrest 20a of the chair 20 from the side by the Y-axis cylinder device 13, the other armrest 20a
By setting the load receiving arm 8b provided on the auxiliary column 8, the auxiliary column 8 receives the load of the Y-axis cylinder device 13. Therefore, when a load is applied to one armrest 20a, a load due to a reaction force can be applied to the other armrest 20a.

Further, if the Y-axis cylinder device 13 is attached to the auxiliary support column 8, a test in which a load is applied alternately can be performed.

Next, a case will be described in which a test corresponding to ISO is performed in which a load is repeatedly applied to the seat plate 20c and the backrest 20b almost simultaneously.

As shown in FIG. 3 and the like, the test is performed using an ISO-compatible loading device 19. First, the X-axis cylinder device 10 is operated to apply a load to the seat plate 20c of the chair 20 in a substantially vertical direction, and then the Y-axis cylinder 13 is operated to apply a load to the backrest 20b from the front in a substantially horizontal direction. At this time, the chair 20 is X
Since it is pressed downward by the axial cylinder device 10, even if a load is applied to the backrest 20a from the front, the chair 2
0 will never fall. In addition, a restraint plate 1h is attached to the front and rear of the chair 20 as a slip stopper on the foot portion.

Next, the load applied to the backrest 20b is released, and then the load applied to the seat plate 20c is released. Repeat this to check that the chair 20 has no damage or distortion.

In addition, in the test to apply the load and the test corresponding to ISO, the personal computer 15 and the repetitive load control device 14
The cylinder devices 10 and 13 are controlled by the so that the test can be automatically performed. Further, in these tests, the displacement and strain of furniture when a load is applied can be measured in real time by the digital strain measuring machine 16.

Next, when performing an impact test on the seat plate 20c of the chair 20, the drop impact device 11 is attached to the loading device attachment arm 4, the chair 20 is set under the attachment, and the guide rail 11d.
The positioning part 11e is fixed at a predetermined position of, and the drop part 11a is lifted to the positioning part 11e and dropped. By repeating this, the chair 20 is damaged or the cushion is flattened.

When performing an impact test on the backrest 20b of the chair 20, the pendulum type impact device 12 is attached to the loading device attachment arm 4 and the chair is set in the swing direction of the pendulum portion 12a. Then, the pendulum portion 12a is pulled up to the stopper 12g of the angle determining portion 12c and dropped to impact the backrest 20b. Repeat this, backrest 2
Check 0a for damage.

For the above-mentioned test of the chair 20, for example, the seat board 20b
Several tests can be performed in combination, such as the impact test of (1) and the load test of the armrest 20a.

Further, the same test as the chair 20 described above can be performed on small furniture that can be placed on a base other than the chair 20.

Next, as shown in FIG. 8, for example, a conference table
When testing large furniture such as 21 etc., by removing the auxiliary support column 8, a large opening is provided on the side of the base 1 and auxiliary to the side surface of the base 1 according to the size of the furniture. The base 9 is connected, the upper surface of the base 1 is enlarged, and the conference table 21 is set. About the concrete test method, except that it is not possible to receive the load from the side by the auxiliary column, it is a test in which a load is applied by the cylinder devices 10 and 13 as in the case of the chair 20, and a pendulum type and drop type impact. apparatus
It is possible to perform an impact test and the like according to 11 and 12.

As described above, according to the furniture strength tester A of the present embodiment, the support columns 2 forming the frame for attaching the loading devices 6 and 7 are provided at the three corners 1d of the four corners 1d of the base. Along with the provision of the auxiliary columns 8 which are detachably provided at the positions facing the loading device attachment side plates 5 attached to the frame body, small furniture such as the chair 20 is provided on the two side surfaces of the base 1. However, even if the pillar 3 and the beam 3 which are frames for attaching the loading device are not provided, the second loading device 7 attached to the loading device mounting side plate 5 applies a load from the side and Since a load from the side can be received by the auxiliary column 8, it is possible to perform a test in which the load is applied from both sides of the furniture.

Since the columns 2 are provided only at the three corners 1d of the base 1, if the auxiliary columns 8 are removed, large furniture can be set on the base 1, and the conference table 21 or the like can be comparatively fixed. Even large furniture can be tested for strength.

Further, the size of the furniture strength tester A itself can be set to the minimum necessary size for testing a small piece of furniture such as the chair 20 and does not require a large space. Not only can it be easily installed in an empty space such as a warehouse, but it can also be moved easily, and the trouble of moving furniture to the place where the testing machine is installed can be saved.

[Effects of the Invention] As described in detail above, according to the furniture strength tester of the present invention, the following excellent effects can be achieved.

(A) Since the columns are provided only at the three corners of the base,
It is possible to set a relatively large piece of furniture on the base from the side of the base where the columns are not provided, and perform tests such as durability, safety, and strength.

(B) Then, since the auxiliary columns for receiving the load of the second loading device are detachably attached to the opposing positions of the second loading device which applies a load from the side, the columns and the supporting beams are Even if only the two side surfaces of the base that are adjacent to each other are provided as the frame body for mounting the loading device, the load can be applied from both sides of the furniture.

(C) In addition, even though a small furniture strength tester adapted for small furniture such as chairs can be used for testing large furniture, it does not take up space and can be used in empty spaces such as furniture manufacturing sites and warehouses. It can be installed and used and easily moved. Therefore,
It is possible to save the trouble of moving furniture to a place far away from where the testing machine is installed.

[Brief description of drawings]

1 to 8 are drawings showing a furniture strength testing machine of the present invention, and FIG. 1 is a front view of a furniture strength testing machine equipped with a cylinder device as first and second loading devices, 2 is a plan view of a furniture strength tester similar to that of FIG. 1, FIG. 3 is a side view of a furniture strength tester equipped with an ISO-compatible loading device, and FIG. 4 is a control of the furniture strength tester. A front view showing a personal computer, a repeated load control device, a digital strain measuring machine, and a printer, FIG. 5 is a side view of a furniture strength tester equipped with a drop impact device, and FIG. 6 is a front view of the drop impact device. FIG. 7 is a side view of a furniture strength tester equipped with a pendulum impact device, and FIG. 8 is a furniture strength tester with auxiliary columns removed and a conference table set. A: Furniture strength tester 1 ... Base, 2 ... Post, 3 ... Support beam, 4 ... Loading device mounting arm, 4a ... Connection part, 5 ... Loading device mounting side plate, 6 ... 1st loading device 7 ... 2nd loading device, 8 ... Auxiliary support | pillar.

Claims (1)

[Claims] 1. A furniture strength tester for applying a load to furniture to test its strength, comprising: a rectangular base on which the furniture is placed, and three corners of four corners on the base. Each of the three columns is erected upright, two support beams connecting the upper ends of these columns along the side surface of the base, and horizontally from the upper ends of the columns toward the center of the base. And a loading device mounting arm that is extended to and is connected to each other at the connection part in the center of the base,
An arm for mounting a loader, comprising: a side plate for mounting a loader, the upper end of which is removably mounted on the support beam, and the lower end of which is removably mounted on a side surface of a base at a position corresponding to the upper end. A first loading device that is vertically installed on the furniture and applies a vertical load to the furniture; and a second loading device that is attached to the loading device mounting side plate and applies a horizontal load to the furniture. A furniture strength tester, comprising: an auxiliary support column that is detachably attached to a position facing the loading device mounting side plate and that receives a load of the second loading device.