WO1997021524A1

WO1997021524A1 - Portable hand complex machine

Info

Publication number: WO1997021524A1
Application number: PCT/RO1996/000006
Authority: WO
Inventors: Panu Misailescu Dumitru
Original assignee: Panu Misailescu Dumitru
Priority date: 1995-12-12
Filing date: 1996-06-17
Publication date: 1997-06-19
Also published as: AU6246096A; RO111555B1

Abstract

This invention relates to a portable hand complex machine that can generate a translating movement, a rotary-translating movement or a rotary movement depending on the desired function and that canbe used for acting tools performing high quality works of: chiseling, cutting (sawing), drilling, screwing, unscrewing or other similar works. The technical problem solved by the invention is to offer a portable tool that can generate certain movements, allowing to regulate the axial advance of the tool as a function of the material in which the tool works, independently of the operator's action. The machine according to the invention may be put into motion by an electric motor (2) and a reducing gear (3) fastened on an element of a movable cross joint and a pair of axial cams: a fixed cam (7) mounted on a support piece (5) and a movable cam (8) receiving a translating motion which is transmitted to an intermediate piece (13) having multiple functions. In order to obtain a rotary-translating motion, the second end of the multifunctional axle (17) has a number of external grooves that engage the internal grooves of said support piece (5). The machine has a helical spring (16) controlled by screwing and unscrewing a nut (15) on the intermediate piece (13) for retaking the work cycle.

Description

PORTABLE HAND COMPLEX MACHINE

TECHNICAL FIELD

The invention relates to a portable hand complex machine which can generate a translating movement, a rotary-translating movement or a rotary movement depending on the desired function and which can be used for acting tools which perform high quality works of: chiseling, cutting (sawing), drilling, screwing, unscrewing or other similar works.

BACKGROUND ART

There are known portable hand machines generating a rotary or a rotary- translating movement which are used for performing drilling or similar works. These machines comprise a housing with a handle for receiving a kinematic chain comprising a several toothed wheels having intermediate axles which together with the means for converting the movement which are synchronized with the resilient means assure the action of the tools by a motor placed in said housing. The disadvantages of these machines consist in performing a little number of works and in having a noisy operation.

The technical problem solved by the invention is to offer a portable hand complex machine which can generate a translating, a rotary-translating or a rotary movement allowing to regulate the axial advance of the tool as a function of the material in which the tool works, independently of the operator's action. DISCLOSURE OF INVENTION

The machine according to the invention eliminates the above said disadvantages by that it may be put into motion by an electrical motor which is placed-irvthe machine housing, said motor together with the related reducing gear is fastened on an element of a movable cross joint and said gear intermediating the movement of a support piece which is centred by a radial-axial bearing which is fastened also in said element of said cross joint, the movement of said support piece being transmited to a pair of axial cams, from which one is fixed and is mounted on said support piece and the other is movable and forced to slide along the same support piece by an intervention piece to which it comes into contact, thereby achieving the conversion of the rotary motion of the fixed cam into a translating motion of the movable cam. Said movable cam, on its turn further transmits the translating motion to an intermediate piece which may slide as to the internal casing of a radial-axial bearing fastened into the machine housing, serving also to support and centre said intermediate piece into which a multiple function axle is mounted, said axle having an end for fastening the working tool and for controlling its passing into the rotary movement, the return into the initial position after performing a translation (forward stroke) for retaking the cycle is assured by a helical spring controlled by screwing and unscrewing a nut on the intermediate piece, thereby pressing and releasing the spring between the shoulder of said intermediate piece and said casing of the radial-axial bearing into which said intermediate piece slides having as a result the modification of the contact length of the two axial cams, direct proportionally influencing the tool stroke, the machine assuring a translating motion to the tool.

The damping of the shocks caused to the pieces forming the kinematic chain of the machine is made by resilient means which are specific to each zone as a function of their amplitude. The first element of the movable cross joint is allowed to move in a horizontal plan relative to the second element which on its turn may move in a vertical plan relative to the housing thereby selfcentring the entire system for transmiting and converting the motion from the driving force to the working tool.

For obtaining a rotary-translating motion to the tool it is necessary for the external grooves made on the second end of the multifunctional axle to engage the internal grooves of said support piece as a consequence of succesive manoeuvres which are performed logically on the assembley of: intermediate piece, its supporting bearing, returning spring, controlling nut and multifunctional axle. If only a rotary movement is desired for the tool, said intervention piece is acted such that it does not come into contact with the movable cam. Because the kinematic chain of the machine is flexible, it is possible to easily pass from one type of the motion to another by a simple action of control which is specific to every operation to be performed. For the same reason the start of the machine is possible by means of a transmission cable which links a driving part placed at a distance from the machine and its supporting piece.

The machine according to the invention has the following advantages:

- enlarges the working range; - reduces the vibrations.

BRIEF DESCRIPTION OF DRAWINGS

An embodiment example of the invention is given refering also to figures 1 to 6 which represent:

- fig 1 , an axial section view of the machine; - fig 2, a plan view of the machine;

- fig 3, a sidely view of the machine;

- fig 4, the element of the movable cross joint;

- fig 5, the fixed axial cam;

- fig 6, the movable axial cam. BEST MODE OF CARRYING OUT

The machine according to the invention comprises an electrical energy supplyng cable 1 for an electrical motor 2 and a switch K for inverting the rotating direction and modifying the rotative speed of the motor 2. The rotative speed of the motor 2 is reduced by a reducing gear 3 such that the torque on the shaft 4 is sufficient for an optimal operation of the machine. The shaft 4 transmits the rotating movement further to a supporting piece 5 by blocking pins 6. On the supporting piece 5 there are a pair of axial cams from which a fixed cam 7 which is mounted on the piece 5 rotating together with said piece, and a movable cam 8 in conjunction with the fixed cam 7, each cam covering an angle from 0 ° to 180 ° and being characterized by a parameter named pitch similar to that of the screws which is selected as a function of the desired aim, fact which allows cams to achieve a linear contact, with a uniform loading of surface on the entire contact surface. The movable cam 8 may rotate on the supporting piece 5 or may axially move on the said piece. The supporting piece 5 which is centredly placed, is supported by a radial-axial bearing 9 which is fastened in an element 10 of a movable cross joint, said element 10 serving also for a centred fastening and supporting the group formed of the motor 2 and the gear 3 and has the possibility to move in a horizontal plan relative to an other element 11 together with which it forms the movable cross joint because of the hinges 12. The axial displacement of the movable cam 8 is transmited further to the intermediate piece 13 which has the possibility on its turn to axially displace relative to the intemal casing of an other radial-axial bearing 14 serving also for supporting and centring the intermediate piece 13. The size of the axial displacement of the intermediate piece 13 is controlled by a regulating nut 15 by its screwing or unscrewing on said piece, said operation causing the pressing or releasing of a helical spring 16 for returning to the initial position of the intermediate piece 13. Into the intermediate piece 13, an axle 17 is screwed and the radial-axial bearing 9 and the radial-axial bearing 14 are fixed by fastening ring 18. The conversion of the rotary movement of the fixed cam 7 into an axial displacement movement of the movable cam 8 is possible because of an intervention piece 19 which comes into contact with the mobile cam 8 by a radial bearing 20. Coming in or out of the contact of the piece 19 with the movable cam 8 is possible because of pressing or releasing of a helical spring 21 placed between the shoulder of the intervention piece 19 and the cover 22 fixed by screws 23 on the housing 24 of the machine. The element 11 has the possibility to move in a vertical plan relative to the housing 24 by hinges 25. The element 10 and the element 11 together with the hinges 12 and with the hinges 25 form the movable cross joint having the role of supporting and selfcentring the entire system for transmiting and converting the movement from the driving part to the machine's working tool. Each hinge 25 contacts a placing piece 26 because of the released spring 27. The placing piece 26 may slide in a frame piece 28 pressing the helical spring 27 and absorbing the shocks developed in the whole kinematic chain of the machine. A handle 29 and a helping handle 30 serve to hold the machine for handling when, because of the sizes corresponding to the power which is to be developed as a function of the utilisation field, it is not more possible the machine fastening to the housing 24 for handling. The frame piece 28 is fasten to the housing 24 by screws 31. A resilient ring 32 absorbs the shocks caused by the return of the intermediate piece 13 into its initial position and a helical spring 33 absorbs the shocks which are produced when the movable cam 8 contacts the fixed cam 7. The axle 17 screwed into the intermediate piece 13 is protected against total unscrewing by a blocking ring 34. The housing 24 has a conical shape for allowing an inward movement of the assembly formed of the motor 2, gear reducing 3 and the movable cross joint. This movement is necessary for selfcentring the entire system for transmiting and converting the motion from the driving part to the machine's working tool and the acces to this zone is stopped by a closing piece 35. When for the operating reasons the machine is to be used in a miniatural size, said machine is started for movement by a transmission cable 36 which links the driving part, which is placed at a distance from the machine, to its supporting piece 5. The pressing-releasing size of the helical spring 21 is established by a nut 37 and the pressing-releasing size of the helical spring 16 is established in a direct proportional relation to the contacting length of the two cams thereby determining the tool's stroke.

By means of the switch K, the cable 1 for supplying the electrical motor 2 with the electrical energy induces a specific rotative speed and a specific rotating direction such that the reducing gear 3 delivers through the shaft 4 a nominal torque which is sufficient for an optimal operation of the machine. The rotary movement of the shaft 4 is taken over by the supporting piece 5 through the blocking pins 6 for preventing the rotation of the shaft 4 into the supporting piece 5. Said μiece 5 plays a very important role because it carries a pair of axial cams, namely, a fixed cam 7 which is directly mounted on the piece 5 and rotates together with it and a movable cam 8 in conjunction with the cam 7. Each cam covers an angle from 0 ° to 180 °. Similarly to threads, the cams have a pitch which may be selected as a function of the desired machine utilization, allowing the cams to achieve a linear contact between them with a uniform loading of their respective surfaces on the whole contact length. The movable cam 8 may also rotate or axially displace on the supporting piece 5. For this aim, said piece 5 should be centredly positioned and supported on the radial-axial bearing 9 which is fastened in the element 10 of the movable cross joint. The element 10 serves also to fasten centredly and support the assembly formed of the motor 2 and the reducing gear 3 having the possibility to move in a horizontal plane relative to the other element 11 together with which it forms the movable cross joint by means of the hinges 12. The axial movement of the movable cam 8 is further transmited to the intermediate piece 13 which has, on its turn the possibility to axially move relatively to the internal casing of the radial-axial bearing 14 which serves also to support and center the intermediate piece 13. The size of the axial movement of the intermediate piece 13 is controlled by the nut 15 which, for this reason, is screwed or unscrewed on the respective piece. When this operation takes place, the helical spring 16 is pressed or released causing there after the return of the intermediate piece in its initial position. A direct proportional relation between the axial movement of said piece 13 and the contact length of the cams is established and thereby the cams determine the tool's stroke.

The multifunctional axle 17 is screwed into the intermediate piece 13 and the radial-axial bearing 9 and radial-axial bearing 14 are fastened by means of fastening rings 18. The rotary movement of fixed cam 7 is converted into an axial movement of the movable cam 17 by means of the intervention piece 19 which contacts the movable cam 8 through the radial bearing 20. Coming into or out of the contact of the piece 19 with the movable cam 8 is assisted by the helical spring 21. which is pressed or released between the shoulder of said piece 19 and the cover 22 which is fixed above by the screws 23 on the machine housing 24. The element 11 has the possibility to move in a vertical plan relative to the machine housing 24 through the hinges 25. Because the element 10 and the element 11 together with the hinges 12, respectively, with the hinges 25 form the movable cross joint, there is such provided the function of supporting and self centring the entire system for transmiting and converting the movement from the driving part to the machine working tool. Each hinge 25 contacts a placing piece 26 because of releasing each helical spring 27. When because of incidental shocks, efforts above an admited limit are induced to the kinematic chain of the machine, the placing piece 26 has the possibility to slide in a frame piece 28, pressing the helical spring 27 which acts as shocks absorber. When becomes necessary the machine may be provided with a handle 29 and a helping handle 30 for an optimal handling as a function of the size dictated by the utilization field. The machine design on a reduced size allows a good handling by a direct grasping of the housing 24.

The frame piece 28 is fastened to the housing 24 by the screws 31 and a resilient ring 32 regulates the return into the initial position of the intermediate piece 13. The controll of the contact between the movable cam 8 and the fixed cam 7 is performed by the helical spring 33.

The axle 17 which is screwed into the intermediate piece 13 is protected against total unscrewing by the blocking ring 34. The housing 24 has a conical shape such that to permit an inward movement of the assembly formed of the motor 2, the reducing gear 3 and the movable cross joint. Said movement is necessary for selfcentering the entire system for transmiting and converting the motion from the driving part to the working tool. The access into said zone is prevented by a closing piece 35. When for the operating reasons the machine is to be used in a miniatural size, said machine is started for movement by a transmision cable 36 which links the driving part, which is placed at a distance from the machine, to its supporting piece 5. The helical spring 21 is acted by the nut 37. The axle 17 serves for holding the working tool and for controlling the start or the stop of its movement. The absorbtion of the vibrations and the shocks caused to pieces forming the kinematic chain of the machine is made by resilient means which are specific to each zone as a function to their amplitude. For obtaining a rotary-translating motion to the tool it is necessary for the external grooves made on the axle 17 to engage the internal grooves of the supporting piece 5, as a consequence of successive manoeuvres which are performed logically on the assembly of : the intermediate piece 13, its supporting and centring bearing 14, helical spring 16 and controlling nut 15 and the axle 17. If the operator is interested only a rotating movement being induced to the working tool, it acts on the intermediate piece 19 and on the nut 37 such that by pressing the helical spring 21, the radial bearing 20 doesn't more contact the movable cam 8. On this case, the movable cam 8 which is freely moving is not forced to convert the rotary movement of the fixed cam 7 into the axial displacement movement, said rotary movement being transmited from the supporting piece 5 by its internal grooves engaging the external grooves of the axle 17. In the figure 1 , the machine is illustrated as being in a translation operating regime.

Claims

Portable hand complex machine generating a translating, rotary- translating or rotary movement, allowing the regulation of the axial advance as a function of the material which is processed by the working tool irrespective of the operator's action which can be used for moving tools performing high quality works of: chiseling, cutting(sawing), drilling, screwing-unscrewing as well as similar works comprising a kinematic chain moved by a motor-reducing group, placed outside the housing, and the machine which for regulating the axial advance as a function of the material which is worked by the tool and for enlarging the range of works which are performed and for reducing the movement of the kinematic chain it may be made by an electrical motor (2)and reducing gear (3), the rotation direction and the modification of the rotating speed of the motor (2) being made by a switch K or by a transmission cable (36), the electrical motor (2) and the reducing gear (3) are centredly fastened together on a movable cross joint formed of an element (10) which by means of hinges (12) is allowed to move in a horizontal plan relative to an element (11) which, on its turn, by hinges (25) is allowed to move in a vertical plan relative to the housing (24) of the machine, the switch (K) controlling the motor's parametres in such a way that on the shaft (4) it develops a nominal torque which is sufficient for an optimal operation of the machine, said shaft (4) is fastened into the support piece (5) by means of blocking bolts (6) said piece (5) is centrally positioned and supported by a radial-axial bearing wich is fastened into the element (10), a fixed cam (7) wich is mounted on the support piece (5) and is rotated together with said piece (5) and a movable cam (8) being in conjunction with the fixed cam (7) wich is allowed to rotate and axially move on the support piece (5)each of the two cams covering an angle from 0 ° to 180 ° they being characterized by a feature named pitch similar to that of the threads wich may be selected as a function to the desired aim, this arrangement allowing the two cams to achieve a linear contact between them with a uniform loading of the surface on the whole contact length, a helical spring (33) being placed for damping the shocks created by their contact, the rotary movement of the fixed cam (7) being converted into an axial movement of the movable cam (8) by the action of an intervention piece (19) to wich it enters into contact through the radial bearing (20), the contact pressure and the returning stroke being provided by releasing or pressing the helical spring (21) with a specific value through the nut (37), said movable cam (8) acts on the intermediate piece (13) to wich its transmits the axial movement and its return is provided by the helical spring (16) the size of the axial movement of the intermediate piece (13) is controlled by screwing or unscrewing the regulating nut (15) on the intermediate piece (13) and thus pressing or releasing a helical spring (16) between the shoulder of the intermediate piece (13) and the internal casing of the radial bearing (14) wich plays also the role of centring and supporting the intermediate piece (13), said spring (16) has the role to return said piece (13) into its initial position, said operation establishing a direct proportional relation with the contact length of the two axial cams wich, on their turn, determine the translating stroke of the tool, a multifunctional axle (17) is screwed into the intermediate piece (13) said axle (17) being protected against total unscrewing by a blocking ring (34), when the conversion of the translating motion into rotary- translating motion is desired, there is necessary to act on the axle (17), the intermediate piece (13), radial-axial bearing (14), helical spring (16) and regulating nut (15) such that the external grooves made on the axle (17) engage the internal grooves of the support piece (5), thus obtaining a rotary-translating motion of the working tool, and in that very moment, if we desire to free the movable cam (8) from the contact of the radial bearing (20) fastened to the intervention piece (19) by acting the nut (37) to press the helical spring (21) we shall obtain only a rotary motion of the working tool, in all the operating situations, the absorbtion of the vibrations and shocks caused to the pieces forming the kinematic chain is made by resilient means wich are specific to the respective zone as a function of their amplitude: the helical spring (27) and the placing piece (26) wich function together as a shock absorber, the helical spring (33), the helical spring (21), the helical spring (16) and the resilient ring (32) and when greater sizes are determined by the utilization field and by the machine power, said machine may be necessaryly provided by a handle (29) and a helping handle (30) for its handling on the optimal conditions and in a miniatural size shape, the machine will be put into operation by a transmission cable (36) and the optimal handling may be made by directly seizing the housing (24) of the machine.