JP2008024278A - Structure of handle lock mechanism in handle folding type truck - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve problems such as rattle of a handle, a trouble of a step-in operation of a lock bar, and hooking of the lock bar when the handle is erected which are caused of a system itself of a conventional handle lock mechanism in a handle folding type truck by a simple means. <P>SOLUTION: In a system of a handle lock mechanism, firstly, a first supporting base point is formed of a shaft part of a bracket similar to a conventional system, a second supporting base point is a circular mouth part of a tubular section forming a bottom of a handle, and an round-shaped recess formed in the circular mouth part is of a lock system to be fitted so as to be matched with the lock bar. An arch-shaped flange is provided on a side face of the circular mouth part, and the lock bar is pressed by turning the handle. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention provides a simple method for solving serious and difficult problems that are shipped as unskilled products, such as problems with handle grabs and malfunction of the lock bar in a handle folding cart. The present invention relates to a structure of a handle lock mechanism which is an object and causes this problem.

  There are various human-powered luggage transport tools, but hand carts (hereinafter referred to as “carts”) with small-diameter wheels such as casters at the bottom of the cargo bed are used throughout society, and are the most popular representative tools. It is. There is also a handle folding cart that can be folded to the loading platform side with a shaft portion of a mounting portion (hereinafter referred to as a bracket) where the handle (handle) is installed on the loading platform as a base point. This type is an essential function for the transportation industry, especially on the assumption that it is carried on a freight car, but this is the type of cart that is generally marketed because it is suitable for product distribution and inventory. In view of this situation, technological innovation related to the folding function of the handle is a high-market-value theme, and what is particularly important is the method of locking and releasing the folding handle in the upright position (lock mechanism) It is in.

  From this point of view, if you verify the structure of the bracket that also serves as the lock mechanism of the conventional handle folding cart, you will find that there are problems that cannot be overlooked. The cause of this is the locking mechanism itself, which is outlined below. First, a locking plate that is bent at one side of the handle at the lowermost position, or a locking tool that is attached to the bracket receives one side of the handle, and the opposite side is a round bar-shaped lock with a spring pulling force. This is a system in which the handle is kept upright by the pressure contact of the bar. In other words, the point that is sandwiched and not fixed is the point. According to this method, the stability (with the grat) for holding the handle depends on the pulling force of the spring. Therefore, the use of a strong spring increases the stability, but conversely makes it difficult to step on the lock bar. You cannot get out of the dilemma. In other words, since both of these mechanisms cannot be satisfied, the trouble with the handle grab and the depression of the lock bar always occurs even if there is a difference in degree. Since the handle in the grungy state is ugly as a product, the current situation is that the degree of failure is distributed by using a hard spring.

  Next, the lock release when the handle is folded is a natural operation, but in the conventional method, the same operation is also required when the folded handle is raised. This is because the lock bar is caught at the halfway position of the standing-up operation, and this must be stepped on one by one. Although it is not a big problem in general, it is troublesome to step on the lock bar with a hard spring for the transportation business that frequently performs the folding operation of the handle. However, this problem is also caused by the locking mechanism itself, as described above, and cannot be avoided.

  Next, the method in which the lock bar and the locking plate or the locking tool sandwich the both surfaces of the lower part of the handle has a problem of rubbing the pipe and scratching the paint. Most handles are made of steel, so paint removal and damage can cause corrosion. Even partial corrosion is an important part responsible for holding the handle, so if corrosion progresses, it will ruin everything. This is also caused by the locking mechanism itself and cannot be avoided.

  In addition, the conventional cart has a structure in which the handle cannot be tilted to the rear side. Although the handle is subjected to a heavy load by the leverage of the lever, it cannot be defeated at all in order to establish the function of the folding handle. Therefore, it can be said that a locking plate or a locking tool by bending integrally with the bracket is provided to completely prevent only one side. Although this seems natural at first glance, it actually only gives priority to the convenience of the manufacturing side, resulting in the user having to use limited carts. This is because, for example, in the transportation industry, pulling and moving the carriage after delivery is much more efficient, and it is comfortable to return quickly without worrying about the height or level difference of the sidewalk. In this case, it is necessary to tilt the handle to the rear, but this is obstructed by a locking plate or a locking tool. Since it is a cart used in various businesses and environments, it is natural that usage will change depending on circumstances. For the user, there is no merit in the limited-use cart, so this is just one of the problems.

  In spite of having many problems and problems, there is a reason why the conventional method is widely adopted. That is, since the handle has a shape in which two spaced pipes are standing in a U-shape, locking and unlocking are performed simultaneously on the left and right. Any method can be used simply to obtain this function. However, since the cart is the most intense price competition, the low-cost structure is a top priority. The conventional method is certainly highly complete in this sense, and the structural strength is sufficiently satisfactory. Therefore, in order to solve all the above-mentioned problems and to make this practical, it is an absolute requirement to inherit the low cost equivalent to the conventional method.

  As an invention that is relevant to the present invention, there has been filed an application “attachment structure of carriage handle”. This outline is a new idea system in which the bending structure of the lock bar sandwiches the front and rear of the handle, and there is an advantage that it is not necessary to depress the lock bar in the operation of raising the handle. That is, one problem pointed out by the present invention is solved. However, in this method, since the lock bar is displaced while rubbing the side surface of the handle, a large amount of paint is peeled off. In addition, it is a system that is easier to apply the grazing than the conventional method, rather than being able to eliminate the handle grazing required by the present invention.

In addition, there has been filed an application of “handle attachment structure of handcart”. This relates to robustness and strength, and is an invention that seeks to improve the structure of a bracket that is likely to be deformed or damaged under a load from a loading platform. Moreover, the handle locking mechanism is the same as the conventional one, and there is no relevance to the elimination of grazing caused by this. Therefore, the present invention is similar to the present invention, and is an invention that is completely different from the intended problem and effect.
Japanese Patent Application No. 8-241517 JP 2006-76428 A

  The present invention has begun to solve the above problems. In other words, although it is a foldable handle, the main goal is to obtain the same level of stability as the fixed type, but in the first place it is out of the question, such as a handle that is unstable, and the stable handle is a natural product as a product. Insist on technological innovation with a sense. The conventional locking mechanism has a major problem in that the method itself does not conform to the law of force, and is closely related to various problems. In the present invention, this is corrected to an appropriate method, and as a result, elimination of grabbing, elimination of problems with stepping on the lock bar, elimination of the troublesomeness of unlocking when returning the handle, paint peeling under the handle, The objective is to achieve all satisfaction while inheriting the low-cost structure, such as eliminating damage and enabling the carriage to move.

  In order to solve this problem, according to the first aspect of the present invention, there is provided a handle-folding cart that can be pivoted from an upright position to a front cargo bed surface with the bracket shaft as a support base point. In the round section of the pipe cross section, which is the bottom of the pipe, there is provided a R-shaped recess that crosses the center, and the lock bar installed just below the round section of the pipe cross section is pulled up by contraction of the spring. In this state, the structure is a structure of a handle lock mechanism in a handle folding cart, in which the lock bar fits in the R-shaped recess without gaps.

  In order to solve this problem, according to the second aspect of the present invention, an arch-shaped flange is provided on the side surface of the circular mouth portion of the pipe cross section, which is the bottom surface of the handle, and the folded handle is raised. At the time of rotation, the lock bar located on the rotation line on the arched collar side makes contact with the bulge of the arched collar and is gradually pushed into the loading platform side. The structure of the handle lock mechanism in the handle folding cart according to claim 1 is characterized in that.

  The effect of the invention of claim 1 will be described in detail. First of all, this system has an important meaning in that the circular mouth portion of the pipe cross-section that becomes the bottom surface of the handle is used as the second support base point. Unlike the conventional vague holding that sandwiches the lower part of the handle from both sides as in the prior art, since the lock bar is fitted into the bottom of the handle, the upper and lower two points are held in a fixed state. In short, the law of force works most effectively. Therefore, there is no need to forcibly pull up the lock bar with a spring, and the lock can be sufficiently locked by the contraction force of the appropriate spring. Therefore, if the gap (accuracy) of the combined portion is appropriate, the grazing can be easily eliminated.

  Secondly, the stepping position of the lock bar moves slightly forward of the loading platform, and by using the appropriate spring as described above, a smooth depression of the locking bar is realized, and the front of the loading platform by the depression of the locking bar floats and moves. The problem of falling is completely solved, greatly contributing to safety. This is not an exaggerated theory. A conventional rocker with a hard spring cannot even be stepped on without a weight. Moreover, since the body is left in the handle at that time, this lock is released, so it is natural that the balance of the body collapses at once, and the movement of the unstable loading platform on the wheels is added and the fall is enough It is possible.

  Thirdly, since the guide and slits for the lock bar guides are arranged in a straight line, the base shape of the bracket becomes as simple as possible. Since the prototype is completely left and right, it has the effect of reducing costs such as mold cost, bending work, welding, and orientation adjustment. For example, a low-priced product already has a standard structure, but this is possible because of the use of a low-priced locking fixture without using a bent locking plate, and is impossible for a bracket that requires a certain quality (strength). It is.

  Fourthly, although related to the above, since the holding force of the second support base point works equally in the front and rear directions, the locking plate itself is unnecessary. Therefore, if the lock is released, the handle becomes free on the rear side, and the carriage can be pulled and moved like a rear car. As described above, this is convenient for a trolley car, but there are many cases where it is exceptionally convenient. In this case, the rigidity of the bracket and the shaft is required, but there is no problem in practical use in view of the fact that the bending process becomes simple and the cost can be reduced by not using the welded portion.

  Next, according to the second aspect of the present invention, the arch-shaped brim automatically pushes down the lock bar in the operation of returning the folded handle. This means that there is no need to step on the lock bar each time the handle is raised as in the conventional method, and the handle is locked in the standing position by simply returning the handle. This is a comfortable function that is addictive, but is impossible with the conventional method.

  Further, according to the present system, the lock bar is only in contact with the arch-shaped brim and the round mouth portion of the pipe cross section, and therefore there is no problem of peeling or damage of the paint on the handle. Therefore, the service life of the cart is not only significantly increased but also a selling point of the product.

  Although the outline of the effect by this invention is the above, it is excellent also in the point which has the versatility which obtains an advanced application function. For example, a foot-type brake is commercially available as a stopper device for the main body of the carriage, but if it is connected to a T-type lock bar or the like that passes the cargo bed through this rotating shaft, it becomes a shared function easily. In short, in comparison with product performance, it greatly contributes to cost reduction.

  The first point of the present invention is that the second support base point is a circular section of the pipe cross section that becomes the bottom of the handle. Although the mechanical effect by this is as having mentioned above, it is convenient also in an actual manufacturing process. This is because this part is a round tube having a cavity, so that various processing and component mounting are facilitated.

  The second point of the present invention resides in the function of an R-shaped dent provided at the round mouth of the pipe cross section and an arch-shaped brim provided on the side surface. Since these substantially contribute to the solution of the above-mentioned problems, they are the most important part and at the same time the part where the cost is greatly affected. Therefore, in consideration of the convenience of the purchaser, means for dealing with a low-priced cart to a high-quality cart is also important, and each example of this level will be described in detail in the embodiments.

  Further, the contents described in claims 1 and 2 are the basis of the present invention, but it is not assumed that all of these contents are used simultaneously. Further, the contents of the description are not limited to the details, and some modifications may be made depending on the application as long as they meet the gist of the present invention. For example, the function can be partially selected, and when an R-shaped dent is provided in the round mouth of the pipe cross section, it can function sufficiently even by simply shaving. Furthermore, a hole for a bolt stopper may be provided in preparation for the case where only the function of the handle to tilt to the rear side is unnecessary.

  The upper part of FIG. 1 shows a standard conventional folding cart, and the lower part shows a folded state. FIG. 2 is an enlarged rear view of a conventional bracket c, and FIG. 3 is a side view. Explaining the mechanism of this conventional handle folding function, the handle a is mounted on the loading platform q so as to swing freely around the first support base 30. The lock bar b is moved up and down while being guided by the through hole of the loading platform or the diagonal slit 6 of the bracket, and the upward force is always applied by the pulling force of the spring 5, which is a pressure on the back on the lower side of the handle. The handle is received by a locking plate 7 provided on the bracket so that the handle is strongly sandwiched. When the lock bar is stepped on, the fixing is released and the handle becomes free only to the loading platform side.

  Next, in the case of the bracket c provided with the lock mechanism according to the present method, FIG. 4 is an enlarged rear view, and FIG. 5 is a side view. In addition, hidden important parts are indicated by dotted lines. Although it looks a little different from the conventional structure, it is a completely different function. As shown in the figure, the largest difference is the position of the slit 6 provided in the bracket so that the lock bar b is directly below the handle a.

  In the above example, the spring 5 for pulling up the lock bar b is connected to the shaft rod 6 of the bracket, but this installation position is free.

  FIG. 6 is an explanatory view of the operation theory of pushing down the lock bar b by the action of the arch-shaped flange 20 by the rotation of the handle a. First, as the folded handle is raised, the contact between the arch-shaped brim and the lock bar that is pulled up by the spring to the high position begins, and the depth at which the lock bar is gradually pushed increases as the arch surface bulges, Finally, when it reaches the R-shaped recess 10, it is returned at once and locked. In other words, since it is easy to click, it is a safe operation that is easy for anyone to handle.

  In an R-shaped recess (hereinafter referred to as a recess) 10 and an arch-shaped flange (hereinafter referred to as a flange) 20 for realizing the above mechanism, these may be processed separately, but both functions are required. A monolithic structure is consequently advantageous. Therefore, each example in consideration of cost and strength will be described below. However, the embodiments are preferred examples and are not strictly defined in detail.

  First, as a first example, a thin pipe-like base portion 31 is provided with a recess 10 and a flange 20, which can be bent. FIG. 8 is a side view, and FIG. 9 is a bottom view. This is covered so as to coincide with the circular mouth portion d of the pipe with the same shaving as the dent, and finally welded or bonded. A side view of the covered state is FIG. Since this feature is relatively inexpensive, it can be used for low-priced products. In addition, an insertion structure is also possible if a cut is made in the side surface of the pipe mouth portion to fit the brim.

  Next, as a second example, a round bar or a pipe-like base 31 is provided with a recessed portion 10 and a flange 20, and Fig. 11 is a side view and Fig. 12 is a bottom view. This is inserted in the circular mouth part d of the pipe, and a side view of the mounted state is FIG. The feature of this structure is a structure that is more resistant to wear and deterioration than the first example and has high durability.

  Next, as a third example, a pipe-shaped base portion 31 including the recessed portion 10 and the flange 20 covers up to the upper portion of the first support base point 30 serving as the shaft portion, and from this upper portion on the handle a side. The pipe is inserted deeply. FIG. 14 is a side view, FIG. 15 is a bottom view, and FIG. 16 is a side view in a mounted state. The feature of this structure is a thick material with the portion most likely to be damaged due to the load applied to the carriage, which dramatically increases the robustness of the shaft. Therefore, the parts for improving the function also serve to produce an extremely strong top-level carriage, and the product value is so high that a slight increase in cost is not a problem.

  Next, an embodiment of application of the lock bar b that functions without problems in practical use will be described. In FIG. 17, the horizontal lock bar is changed to a vertical T-shaped bar b2, and the stepping position is at the bottom of the loading platform q. The advantage of this method is that the lock bar disappears from the loading platform and does not hinder the loading of the load, and that there is no need to lift the foot when stepping on, so the safety is high. Of course, a slight increase in cost is inevitable, but it will be a cart that is kind to women and the elderly.

  Here, an embodiment for using a carriage will be described. FIG. 18 shows a use state of pulling movement in which the handle a is directed to the rear side of the carriage. Since it is handle-free, it is in a state of being pulled at a height that naturally matches the grip of the arm. As shown in the figure, this is suitable for moving a carriage with no luggage, and the handle that moves up and down freely according to the movement of the arm is convenient. However, since the free caster is at the rear in the pulling movement, there is a problem that the straightness is inferior, and this is an unsuitable usage when loading a load.

  A cart that does not need to be unlocked when the handle is returned is a necessity especially in the transportation industry such as moving and home delivery. This is because a meaningless useless operation is a sure loss for both labor and management, even if it is a little effort and time, and it is stressful for a worker who repeats every time. In addition, the industrial applicability of the cart that has solved the problem of grazing is extremely high. The finish of the steering wheel is an important criterion for measuring the reliability of the bogie. If there are trolleys with no grabs and carts with neglected grabs, the latter is unlikely to be chosen. Because.

It is a perspective view which shows the state at the time of use of the conventional trolley | bogie, and folding. It is an example of the back enlarged view which shows the conventional bracket. It is an example of the side surface enlarged view which shows the conventional bracket. It is an example of the back enlarged view which shows the bracket of this invention. It is an example of the side surface enlarged view which shows the bracket of this invention. It is explanatory drawing of the operation | movement theory in which an arch-shaped collar pushes down a lock bar. It is an example of the top view which shows the original model before the folding process of a bracket. It is a side view of Example 1 which shows the integral structure of a dent part and a collar. It is a rear view of Example 1 which shows the integral structure of a dent part and a collar. It is a side view at the time of mounting | wearing of Example 1 which shows the integral structure of a dent part and a collar. It is a side view of the example 2 which shows the integral structure of a dent part and a collar. It is a rear view of Example 2 which shows the integral structure of a dent part and a collar. It is a side view at the time of mounting | wearing of Example 2 which shows the integral structure of a dent part and a collar. It is a side view of Example 3 which shows the integral structure of a dent part and a collar. It is a rear view of Example 3 which shows the integral structure of a dent part and a collar. It is a side view at the time of mounting | wearing of Example 3 which shows the integral structure of a dent part and a collar. It is an Example of the application structure of a lock bar. It is an Example of use which shows the pulling movement state of a trolley | bogie.

Explanation of symbols

a: Handle b: Lock bar b2: T-shaped bar c: Bracket d: Round section of pipe cross section (bottom part of handle)
q: Loading platform w: Swivel caster 5: Spring (coil spring)
6: Slit (lock bar guide)
7: Locking plate or locking tool 10: R-shaped recess 20: Arch-shaped flange 30: First support base point (shaft)
31: Pipe-shaped base

Claims (2)

  It is a handle folding cart that can pivot from an upright position to the front cargo bed surface with the shaft portion of the bracket as a support base point, and has a form that crosses the center of the round section of the pipe cross section that becomes the bottom surface of the handle. In a state where an R-shaped recess is provided and a lock bar installed at a position just below the round mouth of the pipe cross section is pulled up by contraction of a spring, the lock bar is not formed in the R-shaped recess. A structure of a handle lock mechanism in a handle folding cart, characterized by a united structure to be filled.   An arch-shaped flange is provided on the side surface of the circular mouth portion of the pipe cross-section which becomes the bottom surface of the handle, and when the folded handle is turned upright, on the rotation line on the arch-shaped flange side. The handle in the handle folding cart according to claim 1, characterized in that the lock bar positioned has an interlocking structure in which the lock bar is brought into contact with the bulge of the arched brim and gradually pushed into the loading platform. The structure of the locking mechanism.

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