JP3170449U - Ladder and stepladder with inclinometer - Google Patents

Abstract

Provided is a ladder and a stepladder including the ladder that can easily adjust the extension / contraction length of an auxiliary leg while checking whether the ladder is within an allowable inclination range. An auxiliary leg 12 slidable along a left leg 11 of a ladder 1 is provided, and a pendulum type inclinometer 3 is suspended in a step 15 located above the locking means 14. The pendulum type inclinometer 3 is formed with a swingable indicator needle and a scale plate located at the tip of the pendulum inclinometer. The width of the scale plate is that of the indicator needle corresponding to the allowable tilt range of the ladder 1. It is formed with a swing width at the tip. [Selection] Figure 1

Description

  The present invention relates to a ladder and a stepladder with an inclinometer that can easily check the inclination of the ladder or the stepladder when the ladder or the stepladder is installed on an inclined ground or the like. Specifically, an auxiliary leg for changing the length of the leg is provided. The present invention relates to a ladder or a stepladder provided with an inclinometer capable of adjusting the extension / contraction length of the auxiliary leg while checking whether or not the ladder is within an allowable inclination range.

  For example, when collecting apples, the ground on which ladders and stepladders are hung has many soft slopes, and there is a risk that the ladders and stepladders may fall over or slip. Therefore, the present inventor has proposed a ladder in which auxiliary legs that can slide freely are provided along the left and right legs of the ladder, and a non-slip mechanism is provided on the lower end surface of the auxiliary legs (see Patent Document 1).

  In the ladder described in Patent Document 1, it is possible to stand the ladder so as not to fall down even on an inclined surface by adjusting the extension / contraction length of the auxiliary leg. However, it is not always easy to check whether the ladder can be safely operated without falling down even if it climbs to the upper part of the ladder only by looking at the inclination of the ladder. Especially when working at a high place using a long ladder, the fall of the ladder leads to a serious accident.

  By the way, the stepladder which can confirm inclination with a meter by embedding a level in the upper surface of the step of a ladder is proposed (refer patent document 2). Of the four legs, a leg length adjusting means is provided on the bottom surface of the two legs diagonally located on each other, and a connecting arm is provided at an intermediate height position between the two legs. A stepladder with a level on top has been proposed (see Patent Document 3). That is, these stepladders can confirm the degree of inclination of the stepladder with a level.

Actual registration 3128851 gazette (FIGS. 1 and 3 etc.) JP 2008-261116 A (FIGS. 1 and 2, etc., and paragraph “0009”) JP 2000-352285 A (FIGS. 1-3, etc.)

  However, it has been found that the stepladder with a level described in Patent Documents 2 and 3 has a problem to be further improved. In other words, the level itself described in Patent Documents 2 and 3 is not described in detail. However, according to the attached drawings, depending on the position where the bubbles move left and right, the bubbles are put in transparent containers sealed with alcohol or the like. The horizontal level is viewed from above.

  In the stepladder described in Patent Document 3, such a level is provided on a connecting arm that connects two legs diagonally, as shown in FIG. Therefore, stand on the sloping ground and adjust the leg length with the low-level adjusting means provided on the bottom of the two legs, and at the same time, look at the bubble position of the level from above to check the level of the level Is not easy. For this reason, after adjusting the leg length adjusting means once, the level of the level is confirmed with a level, and if it is insufficient, this operation must be repeated to reach a desired horizontal position. Such an operation of alternately performing adjustment and confirmation takes a lot of time and effort, and as a result, there is a risk that adjustment to an appropriate horizontal position tends to be neglected.

  Therefore, in the stepladder described in Patent Document 3, on the basis of the description in Patent Document 1, instead of the length adjusting means provided on the bottom surfaces of the two legs, auxiliary legs are provided along the legs. Based on the description, it is conceivable to embed a level in the upper surface of the step instead of the connecting arm. However, in order to embed the level in the upper surface of the step, it is necessary to separately prepare a step having a complicated shape different from other steps. If the above-described level is provided on the upper surface of the step, the viewing window provided on the upper surface of the level is likely to become dirty, making it difficult to visually recognize the horizontal position. In particular, apple orchards and the like are soft ground, so mud tends to adhere to the shoe sole, and mud tends to accumulate on the upper surface of the level embedded in the upper surface of the step. Furthermore, it is difficult to retrofit the level on a stepladder or the like that is not equipped with a level.

  Moreover, in the above-mentioned level, the level is confirmed by a slight movement distance of the bubbles, and in order to accurately confirm the level, it is necessary to visually check from a direction perpendicular to the level. is there. For this reason, it is not always easy to accurately visually check the levelness, and it is not easy to confirm whether or not the standing ladder is within the allowable inclination range.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a ladder and a stepladder with an inclinometer, which can easily check whether or not it is within an allowable inclination range while adjusting the extension / contraction length of the auxiliary leg.

  In order to solve the above-described problems, the ladder with an inclinometer according to the present invention is characterized by an auxiliary leg that is slidable along at least one of the left and right legs, and a pendulum inclinometer that indicates the inclination of the ladder. It is to prepare. The auxiliary leg has a locking means that can be locked to the leg at an arbitrary sliding position, and the pendulum inclinometer is provided with the auxiliary leg of the ladder step located above the locking means. It is suspended from the end of the side. Further, the pendulum type inclinometer has a support shaft, an indicator needle provided on the support shaft so as to be swingable, and a scale plate marked with a scale along the swinging orbit of the tip of the indicator needle. On the scale plate, the swing range of the tip of the indicating needle corresponding to the allowable tilt range of the ladder is marked.

  The tip of the indicator needle and the swing range of the tip of the indicator needle corresponding to the allowable inclination range of the ladder in the scale plate are configured such that a fluorescent film is adhered or a fluorescent paint is applied. Is desirable.

  It is more desirable that the pendulum type inclinometer is provided with a stopper for stopping the indicator needle from exceeding the predetermined swing range.

  Moreover, a stepladder with an inclinometer can also be constituted by the ladder with an inclinometer and a support leg that can be opened and closed with the upper end of the ladder as a fulcrum.

  Here, the “ladder step” means a staircase on which a foot is placed when raising or lowering the ladder, and the cross-sectional shape is not limited as long as it has a certain width and depth. For example, the cross-section includes a circle, a rectangle, and a downward L-shaped or concave shape.

  The term “hanging” means that any of the front side, the rear side, or the lower side of the “ladder step” is provided so that there is no portion protruding above the upper surface of the step. In addition to the case of fixing in advance, the case of retrofitting is also included. Any fixing or retrofitting means may be used. For example, a means that uses a screw or an adhesive, or a means for locking or fitting with a locking means or a fitting means provided in the step corresponds to this.

  “The swinging range of the tip of the indicator needle is marked” means that the scale plate itself is formed to have the width of the swinging range, or only the swinging range is color-coded on the scale plate. It also includes adding a mark such as a thick line, a long line, a colored line, or ▽ (inverted triangle) to both ends of the swing range.

  By adopting a pendulum type inclinometer in place of the level in the prior art, the degree of ladder inclination becomes much easier to see, and many elderly people working in apple orchards are also able to The degree can be confirmed more correctly. That is, in the pendulum type inclinometer, for example, if the swing arm length of the indicator needle is about 5 cm, the swing range of the indicator needle corresponding to the allowable tilt range is about 7 mm. Therefore, the swing distance indicated by the tip of the indicator needle is greatly increased as compared with the slight movement distance of the bubbles indicated by the level, and the degree of inclination of the ladder can be confirmed more correctly and easily.

  In addition, by hanging a pendulum type inclinometer at the end of the step located above the auxiliary leg locking means, the length of the auxiliary leg can be adjusted at the same time while checking the degree of inclination of the ladder. It becomes easy. For this reason, it becomes possible to adjust the length of an auxiliary leg quickly and correctly so that a ladder may be in an allowable inclination range. By suspending the pendulum type inclinometer at the end of the step, it is possible to avoid dirt and damage that may occur when the pendulum is placed on the step with a foot. It is also easy to retrofit or replace the pendulum inclinometer.

  By marking on the scale plate the swing range of the tip of the indicator needle that corresponds to the allowable tilt range of the ladder, the length of the auxiliary leg can be adjusted more quickly and accurately so that the ladder falls within the allowable tilt range. It becomes possible. Also, by attaching a fluorescent film or applying fluorescent paint to the tip of the indicator needle and the swing range of the tip of the indicator needle corresponding to the allowable inclination range of the ladder on the scale plate, for example, in the shade or dusk In addition, even in a dim situation, it is possible to more easily and accurately confirm whether or not the tip of the indicator needle is located within the allowable inclination range of the ladder.

  By providing the pendulum type inclinometer with a stopper that stops the indicator needle from swinging beyond a predetermined swing range, it is possible to prevent the indicator needle from swinging greatly and remaining on the lower surface of the step, for example. That is, in general, an object to which a level or a pendulum inclinometer is attached is not so greatly changed in posture or receives a large impact. However, ladders and stepladders are usually handled in such a manner that they are greatly tilted and rotated left and right and up and down during storage, movement or installation. Therefore, when the ladder or the stepladder is stored or moved while being laid down, for example, the indicator needle may sufficiently jump up and be caught on the lower surface of the step.

  Further, by forming a stepladder with the ladder with an inclinometer described above and a support leg that can be opened and closed with the upper end of the ladder as a fulcrum, the same effects as the ladder described above can be exhibited.

It is a perspective view of a stepladder with an inclinometer. It is a partial enlarged front view of the pendulum type inclinometer attached to the stepladder. It is a front view of a pendulum type inclinometer. It is a cross-sectional view of a pendulum type inclinometer. It is a cross-sectional view of another pendulum type inclinometer.

  The structure of a stepladder with an inclinometer according to the present invention will be described with reference to FIGS. FIG. 1 shows a three-legged stepladder with a ladder 1, an auxiliary leg 12 slidably provided along the left leg 11 of the ladder, and a lower surface of the top plate 4 provided at the upper end. One support leg 2 provided so as to be freely opened and closed, and a pendulum inclinometer 3 provided in step 15 for instructing the inclination of the ladder. The auxiliary leg 12 has a locking means 14 that can be locked to the leg 11 at any sliding position. The pendulum type inclinometer 3 is suspended from the end of the step 15 of the ladder 1 located above the locking means 14 on the side where the auxiliary leg 12 is provided.

  The ladder 1, the auxiliary leg 12, and the supporting leg 2 constituting the three-legged stepladder are aluminum square pipes, and the top plate 4 and the step 15 are formed by pressing an aluminum flat plate. It is formed. Here, the auxiliary leg 12 is slidably inserted into an aluminum guide member 13 fixed to the lower part of the left leg 11 with a rivet. The locking means 14 is provided at a substantially central portion in the length direction of the guide member 13, and the locking means has a push-up bolt that presses the auxiliary leg 12 against the inner wall surface of the guide member. The auxiliary leg is locked at an arbitrary position by loosening or tightening the push-up bolt.

  Anti-skid tools 16 are suspended from the lower legs of the right leg 11 and the auxiliary leg 12 of the ladder 1. Although not described in detail, the anti-skid tool 16 includes a disc-shaped plate having a cut portion at the periphery and a spike shaft that protrudes from the center of the plate via a spring. Therefore, for example, in soft ground, the disc-shaped plate prevents the lower end of the auxiliary leg 12 from sinking, and when a person's weight is applied, the spike shaft penetrates the plate and penetrates the ground, thereby the ladder. 1 side slip can be prevented.

  One support leg 2 constituting the stepladder is rotatably provided on a hinge portion provided on the lower surface of the top plate 4 provided at the upper end, and can be opened at 90 degrees or more with respect to the ladder 1. It has become. The support leg 2 includes an upper leg portion 22 rotatably provided on a hinge portion provided on the lower surface of the top plate 4 and a lower leg portion 23 slidably inserted into the upper leg portion. An anti-skid tool 23 similar to that described above is suspended from the lower end of the leg portion. The lower leg 23 is provided with a locking means 24 for locking to the upper leg 22 at an arbitrary slide position so that the length of the support leg 2 can be changed.

  In addition, as shown in FIG. 1, the step 15 of the ladder 1 is formed with a large number of opening holes 15a projecting upward in the periphery so as to enable slip prevention of shoes and mud dropping on the shoe sole. Yes. As shown in FIGS. 1 and 2, the left and right ends of step 15 are riveted to the left and right legs 11 and 11 via brackets.

  As shown in FIGS. 1 and 2, the pendulum type inclinometer 3 is suspended from the side where the auxiliary leg 12 is provided, that is, at the left end of the step 15. The locking means 14 is provided at a position 30 to 60 cm above the lower end of the auxiliary leg 12, and the pendulum inclinometer 3 is provided at a position 100 to 130 cm above. For this reason, even if it is the attitude | position which does not bend a body largely, the length of the auxiliary leg 12 can be adjusted with the latching means 14 simultaneously, seeing the pendulum type inclinometer 3. Therefore, the length of the auxiliary leg 12 can be adjusted easily and quickly while confirming the degree of inclination by the pendulum type inclinometer 3.

  As shown in FIGS. 3 to 4, the pendulum inclinometer 3 has a support shaft 31, an indicating needle 32 provided swingably on the support shaft, and a support plate 33 for fixing the support shaft. is doing. The indicator needle 32 and the support plate 33 are each formed of an aluminum plate having a thickness of 2 mm. Further, the support shaft 31 is inserted with a bolt 31a having a screw size of 6M into an opening hole provided in the support plate 33, and is fixed by nuts 31b and 31b with the support plate interposed therebetween. The indicator needle 32 is formed in a bowl shape having an opening hole at the upper end, and is suspended swingably on the support shaft 31 through the opening hole. The length of the swing arm of the indicating needle 32, that is, the length of the tip of the bowl shape from the center of the opening hole is about 50 mm.

  The support plate 33 has a substantially semicircular main body portion 33a having a protruding portion at the lower end when viewed from the front surface, a scale plate 33b provided at the lower end portion of the main body portion, and an attachment provided at the upper end portion of the main body portion. A portion 33c is formed. The scale plate 33b has a length of 10 mm and a width of 7 mm, and is formed 5 mm below the lower end of the indicating needle 32. Here, the width 7 mm of the scale plate 33 b indicates the swing range of the tip of the indicator needle 32 corresponding to the allowable tilt range of the ladder 1.

  In this embodiment, since the length of the swing arm of the indicator needle 32 is 50 mm and the width of the scale plate 33b is 7 mm, the swing range of 7 mm where the tip of the indicator needle overlaps the scale plate is provided. Corresponds to an inclination angle of the ladder 1 of approximately 8 degrees. Therefore, if the length of the ladder 1 is 180 cm, when the ladder is inclined 4 degrees to the left and right, the upper end of the ladder corresponds to a state of moving 12.5 cm to the left and right.

  The allowable inclination range of the ladder 1 differs depending on the distance between the lower ends of the left and right legs 11, 11 and the working posture of climbing the ladder, but the inclination angle is about 8 degrees, that is, left and right across the vertical line. Each of the four degrees is based on the experience of the creator based on many cases. The reason why the swing range of the tip of the indicator needle 32 corresponding to the allowable tilt range of the ladder 1 is set to 7 mm is that an elderly person or the like can keep the pendulum type inclinometer 3 in a size that does not interfere with the elderly, This is because the width is easily visible, and this is also based on the experience of the creator.

  As shown in FIG. 4, the attachment portion 33 c provided at the upper end portion of the support plate 33 is bent downward in an L-shape when viewed from the side. The inner surface of 15c is fixed with a rivet 35. FIG. 5 shows another attachment method of the pendulum type inclinometer 103. That is, as shown in FIG. 5, as viewed from the side, a mounting portion 133c is provided horizontally at the upper end portion of the support plate 133, and a rivet 135 is provided on the lower surface of the horizontal portion 115a of the step 115 toward the front side of the ladder. Fixed by.

  As described above, the pendulum type inclinometers 3 and 103 are suspended below the steps 15 and 115, so that they are soiled by mud on the shoes or damaged when the ladder 1 is moved up and down or stored. This can be easily avoided.

  A red fluorescent tape is attached to the surfaces of the indicator needle 31 and the scale plate 33b of the pendulum type inclinometer 3. Therefore, it is possible to more easily and accurately confirm whether or not the tip portion of the indicator needle 31 is located within the allowable inclination range of the ladder 1 even in a dim situation such as shade or dusk.

  Further, as shown in FIGS. 3 and 4, bent portions 34 and 34 are formed on both sides of the upper portion of the main body portion 33a so as to protrude to the front side of the main body portion. It plays the role of a stopper that prevents the rocking.

  Although the stepladder according to the present invention has been described above, the present invention can be configured only by the ladder 1 that does not include the support legs 22 and the top plate 4. Further, the auxiliary legs 12 may be provided on both the left and right legs 11 and 11. In such a case, first, the lengths of both auxiliary legs 12 are adjusted so that the step 15 of the ladder 1 is approximately horizontal, and then the length of the auxiliary legs closer to the pendulum type inclinometer 3 is set to the length of the auxiliary legs 12. Just fine-tune while looking at the inclinometer.

  The indicator needle 32 of the pendulum type inclinometer 3 and the main body portion 33a, the scale plate 33b, and the attachment portion 33c of the support plate 33 can be easily formed in other shapes or the like without being limited to the shapes described above. Further, the height of the engaging means 14, the length of the swing arm of the indicating needle 32, and the width of the scale plate 33b are not limited to the dimensions described above, and can be easily formed with other dimensions.

  Since the ladder and stepladder with an inclinometer according to the present invention can be easily confirmed whether or not it is within the allowable inclination range, it can be widely used in industries related to ladders and stepladders.

DESCRIPTION OF SYMBOLS 1 Ladder 11 Leg 12 Auxiliary leg 14 Locking means 15, 115 Step 2 Support leg 3, 103 Pendulum type inclinometer 31 Support shaft 32 Indicator needle 33b Scale plate

Claims (4)

Auxiliary legs that are slidable along at least one of the left and right legs, and a pendulum inclinometer that indicates the inclination of the ladder,
The auxiliary leg has a locking means that can be locked to the leg at an arbitrary slide position,
The pendulum type inclinometer is suspended from the end of the ladder step located above the locking means on the side where the auxiliary leg is provided,
The pendulum type inclinometer has a support shaft, an indicator needle provided on the support shaft so as to be swingable, and a scale plate having a scale marked along the swinging orbit of the tip of the indicator needle,
A ladder with an inclinometer, wherein the scale plate is marked with a swing range of the tip of the indicator needle corresponding to an allowable tilt range of the ladder. The tip of the indicator needle and the swing range of the tip of the indicator needle corresponding to the allowable inclination range of the ladder on the scale plate are characterized in that a fluorescent film is adhered or a fluorescent paint is applied. The ladder with an inclinometer according to claim 1. The ladder with an inclinometer according to claim 1 or 2, wherein the pendulum type inclinometer is provided with a stopper for stopping the indicator needle from swinging beyond a predetermined swing range. A ladder with an inclinometer, comprising: a ladder with an inclinometer according to claim 1; and a support leg that can be opened and closed with the upper end of the ladder as a fulcrum.

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