Masonry tool.

Abstract

A masonry tool, of the type consisting of a handle (1) or grip, with an inverted "U" configuration, and a flattened metal working blade (2) attached to said handle, characterized in that the blade (2) incorporates two pivots (3) attached to it, corresponding to the area where it joins the ends of the handle (1), pivots materialized in a body of revolution in which a lower neck (4), an intermediate widening (5) and an upper neck (6) of smaller diameter than said widening are established, with the particularity that the ends of the handle (1) terminate in two hollow chambers that are assisted by a lower closing plate or plate (7), which includes a hole (8) of a diameter corresponding to the intermediate widening (5) of the pivot, a hole (8) that communicates laterally with a "U" shaped notch (9), of a width corresponding to the lower neck (4) of said pivot, It being foreseen that on at least one of the plates (8) there is mounted a cam (11) which, by the effect of a spring, tends to press against the upper neck (6) of the pivots to move them towards the locking position determined by the "U" notch (9), a cam which can be rotated to the unlocking position by means of a manually operated control (13), against the tension of the said spring, control (13) arranged on the outside of the handle (1).

Description

Masonry tool TECHNICAL SECTOR The present invention relates to a masonry tool, of the type known in the sector as "trowels" or "rubber trowels", consisting of a flat blade attached to a handle, used mainly for applying, distributing and smoothing mortars, cement, plaster and other similar materials. The object of the invention is to provide a tool with means for fixing the work sheet that allow its easy replacement without the need for tools. BACKGROUND OF THE INVENTION In the practical application of the invention, there are many types of trowels or floats on the market, made up of a flat metal sheet attached to a handle or grip, so that they all share a traditional system of fixing the working blade to the handle or grip by means of screws, which requires unscrewing and re-screwing each time a blade is to be changed, requiring the corresponding tool for this purpose. EXPLANATION OF THE INVENTION The masonry tool that is advocated fully and satisfactorily solves the problem described above, based on a simple but effective solution, which allows for quick replacement of the working sheets without the need for tools. To this end, the tool of the invention includes a handle with an internal mechanical locking and unlocking system, which allows different sheets to be attached and removed quickly and safely. Each blade incorporates two pre-screwed pivots, while the handle incorporates an internal system that automatically locks these pivots when inserted. More specifically, the pivots materialize in a body of revolution in which a neck is established that emerges from the sheet and has a diametral widening to finally undergo a diametral narrowing in correspondence with its free end. For their part, the ends of the handle are finished in two hollow chambers that are assisted by a lower closing plate or plate, in which a hole is established with a diameter according to the maximum widening of the pivots, to allow their passage, a hole that communicates laterally with a "U" shaped notch, with a width according to the neck of said pivots. Simultaneously, a support is mounted on at least one of the plates to guide the rotation of a push cam actuated by a push button. Pressing the button causes the cam to push the pivot through its upper end, displacing it into the U-shaped notch where it is locked. This maneuver is automatic, as the cam's axis is connected to a spring that tends the mechanism towards the locked position. Obviously the cam actuation button will be accessible from the outside of the handle, so that with a simple thumb press on the button against the spring tension the work blade can be detached for easy replacement. BRIEF DESCRIPTION OF THE DRAWINGS To complement the description that follows and to aid in a better understanding of the characteristics of the invention, according to a preferred embodiment thereof, a set of drawings is included as an integral part of said description, in which, for illustrative and non-limiting purposes, the following has been represented: Figure 1 shows a perspective view of a masonry tool made in accordance with the object of the present invention. Figure 2 shows a perspective view of the work plate that is part of the tool and has an interchangeable character. Figure 3 shows a perspective view of the locking mechanism present in correspondence with at least one of the free ends of the tool handle. Figure 4 shows a view similar to that of Figure 3, but in which the pivot of the work plate in a locked position is represented on the mechanism. Figure 5 shows a profile view of the assembly in Figure 4. Figure 6 shows an elevation view of the assembly in Figure 4. Figure 7 shows, finally, a plan view of the assembly in Figure 4. PREFERRED EMBODIMENT OF THE INVENTION In view of the figures described, it can be observed how the masonry tool of the invention is based on the conventional structure of this type of tool, in which a handle (1) or grip, with an inverted "U" configuration, and a flattened metal working blade (2) participate. Well, according to the invention, the sheet (2) or interchangeable sheets incorporate two pivots (3) attached to it, corresponding to the area of ​​confluence with the ends of the handle (1). These pivots consist of a body of revolution in which a lower neck (4), an intermediate widening (5) and an upper neck (6) of smaller diameter than said widening are established. In parallel, the ends of the handle (1) terminate in two hollow chambers that are assisted by a lower closing plate or plate (7), shown in detail in figure 3, which is fixed to the ends of the handle by means of screws (10) This plate (7) includes a hole (8) of a diameter according to the intermediate widening (5) of the pivot in order to allow the pivot to pass through it, a hole (8) that communicates laterally with a "U" shaped notch (9), of a width according to the lower neck (4) of said pivots. Thus, the pivots (3) of the sheet (2) are intended to be accessed vertically through the holes (8) and then moved horizontally until their lower neck (4) stops against the "U" notch (9), a position that prevents the vertical displacement of said pivots, leaving them blocked. For this purpose, it has been planned that on at least one of the plates (8) a cam (11) is mounted, intended to press against the upper neck (6) of the pivots, a cam which includes a pivot shaft (12) assisted by a spring, not shown in the figures, and which tends at all times to push the pivot towards its locked position, so that it can be released by the manual operation of a control (13) against the tension of the said spring, a control (13) which, as can be seen in figure 1, will be easily accessible on the outside of the handle (1). The device thus described allows that when the handle is detached from the blade (2), the blade can be automatically coupled by simply pressing said handle (1) against the pivots of the blade (2), since the spring-assisted cam (11) will cause the horizontal displacement that determines the locking of said pivots, making the detachment maneuver extremely simple, requiring only a partial rotation of the handle (13) so that the pivots are released and can move horizontally until they are facing the hole (8), allowing their extraction.

Claims

1. A masonry tool, of the type consisting of a handle (1) or grip, with an inverted "U" configuration, and a flattened metal working blade (2) attached to said handle, characterized in that the blade (2) incorporates two pivots (3) attached to it, corresponding to the area where it joins the ends of the handle (1). These pivots are formed in a body of revolution in which a lower neck (4), an intermediate widening (5), and an upper neck (6) of smaller diameter than said widening are established. The particularity is that the ends of the handle (1) terminate in hollow chambers that are assisted by a lower closing plate (7), which includes a hole (8) with a diameter corresponding to the intermediate widening (5) of the pivot. This hole (8) communicates laterally with a "U" shaped notch (9), with a width corresponding to the lower neck (4) of said pivot.It being foreseen that on at least one of the plates (8) a cam (11) is mounted which, by the effect of a spring, tends to press against the upper neck (6) of the pivots to move them towards the locking position determined by the "U" notch (9), a cam which can be rotated towards the unlocking position by means of a manually operated control (13), against the tension of the said spring, control (13) arranged on the outside of the handle (1).