GB2025562A

GB2025562A - Triggered safety device for controlling hand-operated tools for the ramming of nails and the like

Info

Publication number: GB2025562A
Application number: GB7921157A
Authority: GB
Original assignee: Individual
Current assignee: Individual
Priority date: 1978-06-16
Filing date: 1979-06-18
Publication date: 1980-01-23
Also published as: FR2434010A1; DE7917080U1; DE2923997A1; IT7822126V0

Abstract

A safety mechanism against accidental actuation of a control trigger 12, for example for nail-driving machines, is disclosed, which comprises an auxiliary trigger 15 which biases the control trigger 12 outwardly and has a camlike protrusion 17 engaging the back surface of the control trigger 12: it is thus necessary to depress the auxiliary trigger 15 first, and then the control trigger 12, to have the machine action started. <IMAGE>

Description

SPECIFICATION Triggered safety device for controlling hand-operated tools for the ramming of nails and the like It is known that hand-tools generally operated by compressed air and capable of ramming tails, clips, tacks and the like, are controlled by a trigger.

The power of said tools is such that the element to be rammed constitutes a dangerous projectile if it is accidentally shot towards people.

The invention concerns a controlled device for this kind of tools adapted to avoid dangerous accidental operation although being simple in use and in manufacture.

In particular the device comprises a first trigger destined to move between a first rest position and a second position in which it acts upon a control member of a ramming tool, a second trigger being pivoted in the proximity of the first trigger and carrying a stop adapted to lock the stroke of the first trigger between its first position and its second position if the second trigger is in spontaneous position from which it can be taken away in opposition to a spring.

In order better to explain the objects and the characteristic features of a device of the kind proposed by the invention, an embodiment given by way of example is hereinafter described with reference to the accompanying drawing in which: Figures 1 and 2 show diagrammatical side view in two operative positions; Figures 3 and 4 are sections taken along the lines Ill-Ill and IV-IV of Figs. 1 and 2.

On a body of a hand-operated ramming tool which is conventional per se and is shown only partly at 10, there is pivoted at 11 a control trigger 12, which in its movement acts upon a control 1 3 that pilots the shot of the ramming element by the action of a servo control operated by compressed air or by any other desired kind of power.

In the proximity of the trigger 1 2 there is pivoted at 14 a second trigger 1 5 upon which there acts a spring 1 6 tending to place it spontaneously into the position of Fig. 1.

In this position the stop 1 7 of the trigger 1 5 acts upon the backside of the trigger 1 2 so as to prevent counterclockwise rotation.

It should be noted that the position of support of the stop 1 7 on the trigger 1 2 is such that any action exerted upon the trigger 1 2 in the way of making it turn counterclockwise causes a thrust onto the stop 1 7 with such a direction as to push the trigger 1 5 so as to make it turn clockwise, hence so as not to abandon its locking position.

If to the contrary the trigger 1 5 is first acted upon, and the stop 1 7 is taken away from the trigger 12, the latter can be easily moved to command the shot (Fig. 2).

It should be noted that after a comparatively short rotation of the trigger 1 5 the stop 1 7 runs past the dead centre whence the force exerted thereupon by the trigger 1 2 pressed passes through the pivot 14 and, therefore, the pressure upon the trigger 1 2 to turn it counterclockwise tends to rotate in the same direction also the trigger 15, thereby warranting that there cannot happen accidental locks in shooting owing to lack of correct control of the trigger 15, after the first step of actuation.

So an absolute safety is attained making any actuation of the shooting control 1 3 by any pressure exerted onto the trigger 1 2 impossible if the trigger 1 5 is not moved previously so as not to hinder any longer in any case the movement of the trigger 1 2 started.

It will depend on the choice of the planner to determine the amount of the first part of the stroke of the trigger 1 2 after which the stop 1 7 runs past the dead centre and, therefore, is no longer in a position to lock the completion of the stroke of the trigger 12; as a matter of fact everybody may adopt the most agreeable compromise between the safety of initial locking and easy actuation of the tool.

The specific shape of the various component parts of the safety device shown obviously may vary, even widely, without influencing its overall operability and the principle on which this invention is based.

1. A triggered safety device for controlling a tool for ramming elements such as nails, clips, tacks and the like, comprising a first trigger destined to move between a first inactive position and a second position in which it acts upon a control member of a ramming tool, a second trigger being pivoted in the proximity of the first trigger and carrying a stop adapted to lock the stroke of the first trigger between its first position and its second position if the second trigger is in spontaneous position from which it can be taken away in opposition to a spring.

2. A device according to Claim 1, characterized in that the said stop acts upon the rear side of the first trigger.

3. A device according to Claim 1, characterized in that the position of pivoting the second trigger is such that the stop acts onto the first trigger with a straight line of action running past the pivot of the second trigger to overcome the dead centre and to reach a position of stability.

4. A device according to the foregoing Claims, substantially as hereinabove described and illustrated in the accompanying drawings.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Triggered safety device for controlling hand-operated tools for the ramming of nails and the like It is known that hand-tools generally operated by compressed air and capable of ramming tails, clips, tacks and the like, are controlled by a trigger. The power of said tools is such that the element to be rammed constitutes a dangerous projectile if it is accidentally shot towards people. The invention concerns a controlled device for this kind of tools adapted to avoid dangerous accidental operation although being simple in use and in manufacture. In particular the device comprises a first trigger destined to move between a first rest position and a second position in which it acts upon a control member of a ramming tool, a second trigger being pivoted in the proximity of the first trigger and carrying a stop adapted to lock the stroke of the first trigger between its first position and its second position if the second trigger is in spontaneous position from which it can be taken away in opposition to a spring. In order better to explain the objects and the characteristic features of a device of the kind proposed by the invention, an embodiment given by way of example is hereinafter described with reference to the accompanying drawing in which: Figures 1 and 2 show diagrammatical side view in two operative positions; Figures 3 and 4 are sections taken along the lines Ill-Ill and IV-IV of Figs. 1 and 2. On a body of a hand-operated ramming tool which is conventional per se and is shown only partly at 10, there is pivoted at 11 a control trigger 12, which in its movement acts upon a control 1 3 that pilots the shot of the ramming element by the action of a servo control operated by compressed air or by any other desired kind of power. In the proximity of the trigger 1 2 there is pivoted at 14 a second trigger 1 5 upon which there acts a spring 1 6 tending to place it spontaneously into the position of Fig. 1. In this position the stop 1 7 of the trigger 1 5 acts upon the backside of the trigger 1 2 so as to prevent counterclockwise rotation. It should be noted that the position of support of the stop 1 7 on the trigger 1 2 is such that any action exerted upon the trigger 1 2 in the way of making it turn counterclockwise causes a thrust onto the stop 1 7 with such a direction as to push the trigger 1 5 so as to make it turn clockwise, hence so as not to abandon its locking position. If to the contrary the trigger 1 5 is first acted upon, and the stop 1 7 is taken away from the trigger 12, the latter can be easily moved to command the shot (Fig. 2). It should be noted that after a comparatively short rotation of the trigger 1 5 the stop 1 7 runs past the dead centre whence the force exerted thereupon by the trigger 1 2 pressed passes through the pivot 14 and, therefore, the pressure upon the trigger 1 2 to turn it counterclockwise tends to rotate in the same direction also the trigger 15, thereby warranting that there cannot happen accidental locks in shooting owing to lack of correct control of the trigger 15, after the first step of actuation. So an absolute safety is attained making any actuation of the shooting control 1 3 by any pressure exerted onto the trigger 1 2 impossible if the trigger 1 5 is not moved previously so as not to hinder any longer in any case the movement of the trigger 1 2 started. It will depend on the choice of the planner to determine the amount of the first part of the stroke of the trigger 1 2 after which the stop 1 7 runs past the dead centre and, therefore, is no longer in a position to lock the completion of the stroke of the trigger 12; as a matter of fact everybody may adopt the most agreeable compromise between the safety of initial locking and easy actuation of the tool. The specific shape of the various component parts of the safety device shown obviously may vary, even widely, without influencing its overall operability and the principle on which this invention is based. CLAIMS