FR2803609A1 - Post driver comprises guide cylinder with impact mechanism, pressure and carrying handles - Google Patents

Abstract

The post driver consists of a guide cylinder (1) which goes over the top of a post, a percussion and impact mechanism with a moving weight (6), rod (7) and stop (8), two drive and guide handles (3, 3'), and two safety and carrying handles (4, 4'). The lower open end (2) of the cylinder is cut at an angle of 45 - 60 degrees to the vertical, and the upper end is closed by a welded cap (5) with a hole in it for the rod. During use the cylinder is placed over a post and driven in by striking it repeatedly with the weight inside the top of the cylinder.

Description

The present invention relates to a manual device for planting or driving different kinds of stakes, stakes or posts. In a traditional way to drive a stake, we use a mass, handled by one person, the stake being held vertically by a second person. This dangerous and painful operating mode, taking into account the risk of injuries caused by improperly adjusted ground blows, and when the stake height is significant, falls of operators mounted on ladders or the like.

Furthermore, in this traditional mode of implementation, the operator must make a significant effort to drive in the stake, while monitoring the depth of penetration of the stake, in order to ensure the leveling of all the stakes which constitute, for example, a fence.

problems posed by the placement of stakes, stakes and the like in the field of installation of fences, stakes, etc., are well known in activities related to agriculture, animal husbandry, and more recently in landscaping gardens for the details.

The prior art teaches us several attempts to solve this problem: - it is known, by an earlier patent application, a device consisting in introducing into the soil a sheath lost in a material resistant to corrosion, in particular based on polymers , provided at its lower part with one or more cutting elements in the form of a spiral, which facilitate its introduction into the ground by screwing and whose finned form with threads prevents its withdrawal from the ground.

device has a major drawback, which consists in the need to provide a lost sheath per stake, which in the case of a fence with several tens of stakes, constitutes a significant additional cost.

- the person skilled in the art also knows the devices derived from pile driving machines, used in the field of public works and in that of bridges and roadways, which include a pole guide element, mounted on a towed chassis, and d '' a mechanical hand operated threshing bell.

This last category of gear, mainly intended for semi-industrial use, does not solve the problem posed to individuals and small farmers to drive a few stakes, without the use of motive power and without the intervention of more than one person of muscular strength average. The device for planting or driving in different kinds of stakes, posts or stakes, according to the present invention, provides the solution to the safety and fatigue problems associated in particular with the production of a fence, while allowing easy handling by a single operator.

Said device is suitable, in particular, for work carried out by individuals, to produce a fence, a palisade or a tutorage, transport, positioning and implementation of the device, which can be carried out by a single person.

The device advantageously consists of four main parts, a main body called the guide chamber; two grips for pushing and guiding; two safety and transport handles; - set of percussion mechanism.

For a better understanding of the invention, the assembly for planting stakes or stakes is illustrated by the following figures and drawings 1 represents an exploded view of the device according to the invention; 2 shows a first embodiment of the device according to the invention; 3 shows a second embodiment of the device according to the invention; 4 shows a third embodiment of the device according to the invention; Fig. 5 shows a fourth embodiment of the device according to the invention; Fig. 6 shows the detail (6 ') of FIG. 4; Fig. 7 shows the detail (6 ") of Fig. 5.

The device according to the invention consists over its entire length of a guide chamber (1) made of a material resistant to wear and corrosion, in particular stainless steel, aluminum or synthetic material, the diameter of which will be adapted to that of the element to be pushed in, the generally cylindrical section of which may have, if necessary, the shape of a polygon, in particular of a rectangle, a triangle or a square.

The length of said guide chamber (1) depends on the one hand on its weight and that of mechanical impact means (6,7,8) and on the other hand, on the length of displacement of the movable part of said mechanical means (6,7,8), in order to define the location of the center of gravity of the device. In general, said length must allow easy manual transport, and efficient guiding of a stake of standard length, said length of the guide chamber being of the order of 50 to 150 cm.

A locating means (not shown in the accompanying drawings) positioned on the upper part of the outer wall facing the user specifies the height of the stake head in the guide chamber (1). This locating means allows, in a fencing configuration, to align a set of stakes or posts in order to easily obtain the desired positioning of a fence.

The lower end of the guide chamber (1) is advantageously cut in a bevel (2), the inclination with respect to the vertical is preferably between 45 and 60, said angle possibly being different depending on construction requirements, said bevel opening to facilitate the introduction of the upper part of the stake into the guide chamber. In a preferred embodiment of the device according to the invention, the loading of the stake into said guide chamber (1) is advantageously effected by the inclination of the device, in order to favor the introduction of the stake resting on the horizontal to the ground.

Two grip and guide handles (3.3 ′) are fixed by any suitable assembly means, in particular by welding, on each side of the outer casing of the guide chamber (1) and perpendicular to its vertical axis and aligned on the same horizontal axis. The distance between the fixed receiving stop cap (5) and said handles (3,3 ') is calculated as a function of the weight of the moving mass and the length of the guide chamber, which makes it possible to shift the center of gravity and to choose the most appropriate handle location thus allowing safe operation.

The gripping and guiding handles (3,3 ') are connected to the upper part of the envelope of the guiding chamber (1) by two handles of and transport (4,4') and fixed to it by any suitable assembly means, in particular by welding.

Said safety and transport handles (4,4 ') constitute mainly the means of transport of the device according to the invention to the place of use and also allow the protection of the operator's hands during positioning and implementation of the device.

The guide chamber (1) houses in its upper part a mechanical shock and energy transmission means (6,7,8), composed of a mass (6), a mass rod (7), and a mass stop (8)., the mass being mobile or Said mobile earth rod (7) is slidably mounted in a bore of diameter equal to or slightly greater than its diameter and passes through a fixed receiving stop cap ( 5), which cap is fixed firmly by its circumference to the outer casing of the guide chamber The mobile mass (6) abutment of the mobile mass (8) are secured, preferably by welding, to the two ends of said rod the moving mass (7).

The diameter of the movable mass (6) is slightly less than the inside diameter of the guide chamber (1), to allow it to slide inside said chamber (1). The mechanical shock and energy transmission means (6,7,8) according to the invention advantageously transmits the energy of striking a mass on the stop (8) by means of the rod (7) on the movable mass (6), which in turn strikes the upper surface of the pile or stake to be driven.

According to a first particular embodiment, illustrated by FIG. 2, a spring (R) is arranged around the movable mass rod (7) in its part located between the stop of the movable mass (8) and the fixed receiving stop cap (5), in order to dampen the moving mass (6) in its downward movement.

According to a second particular embodiment, illustrated by 3, a spring (R ') is arranged around the rod of the mobile mass (7) in the part located between the upper face of the mobile mass (6) and the underside of the fixed receiving cap (5), in order to dampen the moving mass in its upward movement, and to avoid shock in return.

According to another particular embodiment, illustrated by FIGS. 4 and 6, the mobile impact mass (6 ') has an oblong guide groove crossed by a horizontal axis (9), the width of said oblong guide groove being slightly greater than the diameter of said horizontal axis (9) to allow its vertical sliding inside said movable impact mass (6 ′), said horizontal axis (9) projecting outside the guide chamber (1) through the openings made in the external wall of said chamber (1), the diameter of said openings being substantially equal to the diameter of said axis (9), to prevent any movement of the horizontal axis (9) relative to the external wall of the guide chamber (1). According to an alternative embodiment, illustrated in particular by FIGS. 5 and 7, the mobile impact mass (6 ") has two pins (9") perpendicular to the axis of revolution of said part (6 ") and fixed by welding to said mobile impact mass said pins (9") pass through elongated recesses in the outer wall of the guide chamber (1). Said elongated recesses have a width slightly greater than the diameter of the studs (9 "), in order to allow them to slide vertically relative to the outer wall of the guide chamber (1).

The method for planting or driving the stakes or piles using the device according to the present invention comprises the following steps 1: loading of the stake to be planted in the guide chamber (1) through the bevelled lower part (2), the stake resting the ground in a substantially horizontal position; 2. the standing operator holds the handles (3,3 ') of the claimed device with both hands, straightens the stake to be planted capped by the said device and positions it vertically in the previously marked location; 3. the operator activates the device claimed by the handles (3,3 ') by a movement from top to bottom, by striking the top part of the stake by the mobile shock mass (6), which mass (6) bounces upwards, guided by the mobile shock earth rod (7), and in turn strikes the fixed receiving cap (5). The cumulative shock effect amplifies the action of the mobile mass (7), which exerts a vertical pushing force on the top part of the stake, by making it penetrate the ground; 4. when the stake has reached the desired depth, indicated by the means for locating the stake head, the operator actuates the device according to the invention from bottom to top, the mobile impact mass (6) descends to the initial position and its stroke is stopped by the cooperation of the movable rod stop (8) and the fixed receiving cap (5).

The action of the device is then suspended and said device can be removed from the stake, which remains embedded in the ground. Step 3 of the method for planting or driving the stakes or piles using the claimed device can be improved by the use of a spring (R) or (R '), illustrated in FIGS. 2 and 3, said spring (R), (R ′) advantageously absorbing shock between the movable impact mass (6) and the fixed receiving cap (5) between the movable rod stop (8) and the fixed receiving cap (5).

Said particular implementation is particularly suitable for carrying out work for driving stakes into loose soil or for operators who do not have significant physical strength.

The device according to the invention is mainly intended for the implementation of the driving method of different kinds of stakes, posts and piles.

Claims (4)

<B> Claims </B> 1. Manual device for planting or driving different kinds of piles, stakes, or posts, characterized in that it is composed: of a guide chamber of generally cylindrical shape); a set of percussion and shock mechanisms (6,7,8, two push and guide handles (3,3 '); two safety and transport handles (4,4'): 2. Device according to claim 1, characterized in that the guide chamber (1) has the lower end cut in a bevel (2), and in that said bevel (2) has an inclination relative to the vertical between 45 and 60; 3. Device according to claim 1, characterized in that the percussion and shock mechanism assembly (6,7,8) is composed of a movable impact mass (6), secured to a movable mass rod ( 7) provided with a movable earth stop (8); 4. Device according to claim 1, characterized in that ("set of percussion and shock mechanism (6,7,8) is composed of a shock mass (6); Device according to claims 2 and 3, characterized in that said guide chamber is covered with a fixed receiving stopper cap (5), welded to the external wall of the guide chamber (1), and in that the movable earth rod (7) slides in the bore in said cap (5) 6. Device according to claim 3, characterized in that a spring (R) is arranged around the movable earth rod between the fixed receiving stopper cap (5) and the stop 7. Movable mass 7. Device according to claim 3, characterized in that a spring (R ') is arranged around the movable mass rod between the movable impact mass (6) and the underside of the receiving stopper cap. fixed (5); 8. Device according to claim 3, characterized in that the movable mass of ch oc (6 ') has an oblong guide groove in which slides a horizontal axis (9) integral with the external wall of the guide chamber (1); 9. Device according to claim 3, characterized in that the mobile impact mass (6 ") comprises two pins (9"), integral with said mass (6 "), which pins slide in elongated recesses reserved in the external wall of the guide chamber (1); 10. Device according to claim 1, characterized in that it comprises a means for locating the height of the stake head; 11. Method for planting or driving the stakes using Device according to any one of Claims 5 to 9 and Claim 10, characterized in that it comprises the following stages - loading of a stake into the guide chamber through the beveled opening (2); - straightening the stake covered by the device, and its positioning by the operator at the location of its insertion; - stake insertion by the operator who actuates the device from top to bottom, holding it by the handles 3 ′), said mass impact mobile (6) as the top part of the pole bouncing upwards, guided by the mobile shock earth rod (7), and in turn strikes the fixed receiving cap - end of the insertion as indicated by the marking head means .