DE1213292B - Cutting head for a hair clipper - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. α .:

B 26 b

German: 69-12 / 01

Number: 1213 292

File number: K 517351 c / 69

Filing date: December 27, 1963

Opening day: March 24, 1966

The invention relates to a cutting head for a hair clipper with in one as a handle trained housing arranged drive motor, wherein the cutting head is arranged on the housing is and an immovable knife and one on the latter movable back and forth in the longitudinal direction Has knives that can both be unfolded relative to each other when not in use, and wherein the movable knife is held by a carrier and resiliently counter to it in its operative position the immovable knife is pressed.

In the known, equipped with a fixed and a reciprocating knife Cutting heads, with the movable knife in its active position resiliently against the stationary one Knife is pressed and held by a carrier, is for the guidance of the knife or the knife carrier parallel guidance is required for the reciprocating movement. For example, a Bark bolt-slot guide or use a cam-notch guide. With another well-known Device a rail guide is provided. Should now a perfect parallel guidance of the two knives are achieved against each other, very tight tolerances must be observed, even very small tilts lead to the knife jamming.

Furthermore, the known cutting devices have the disadvantage that the knife movement to be applied Power is great and therefore requires relatively powerful engines. This is one hand due to the fact that the knife carrier is fixed and therefore a relatively strong pressing of the movable to the fixed knife is required, and on the other hand that the spring for pressing always acts directly on the movable knife and is therefore inevitably proportionate must be strong, especially with a view to the fact that a power transmission from constructional reasons is not possible. In these designs, the movable knife is also used moved relative to the pressure spring, so that additional frictional forces occur.

Finally, in these known cutting devices, a drive member is always required that directly engages the movable knife and is therefore relatively long. Therefore lie also all guide and drive points directly in the area of the knife, so that their risk of contamination is increased and disruptions to operations occur can.

Hair clippers are also known, with a cutting head for a hair clipping machine

Applicant:

Kobler & Co., Zurich (Switzerland)

Representative:

Dipl.-Phys. H. Schroeter, patent attorney,
Munich 25, Lipowskystr. 10

Named as inventor:

Victor Kobler,

Werner Kobler, Zurich (Switzerland)

Claimed priority:
Switzerland of January 4, 1963 (72),
dated April 19, 1963 (4985),
dated May 17, 1963 (6261)

which the knives can be folded out into a non-use position. So it is with a hand-operated Device known to rotate the fixed knife. However, the movable knife is supposed to be exposed are, for which the spring tension must be released, there is a risk of overstressing the spring when removing the movable knife. The object underlying the invention is to see in designing a cutting head in such a way that a single component, namely the carrier of the movable Messer all occurring load and movement functions, i.e. the back and forth movement of the movable knife, the resilient compression of the knife and pivoting apart the knife takes over. In doing so, neither the guidance of the movable knife nor the accuracy the cut, the low design effort for the knife movement, the easy interchangeability of the movable knife or the necessary contact pressure for the knife deteriorates will. Furthermore, the device should be easy and without any risk of damage to the user can be cleaned.

According to the invention, this object is thereby achieved in a cutting head of the type mentioned at the outset

609 539/59

Figure 3 is a section on the line I-I in Figure 4 a further embodiment of a cutting head with adjustable double rocker axis bearings;

F i g. Figure 4 is a cross-section through the cutting head of Figure 3;

Fig. 5 is a vertical section along the line VV in Fig. 6 through a further example of a cutting head according to the invention;

Figure 6 is a front view of the cutting head according to FIG. 5 with the housing arm cut away;

FIG. 7 is a vertical section through a first variant of the cutting head according to FIG. 5;

Fig. 8 is a vertical section through a second

solved that the carrier of the movable knife one
angle lever enclosing an acute angle
is the one to generate the knife movement
its parallel to the direction of movement of the knife
Swivel bearing back and forth through the driven member of the drive motor acting on a lever arm
is movable and to press against each other
two knives in their position of action under one
Spring tension is. Thus, the longitudinal mobility of the angle lever is used on the one hand to generate io
the reciprocation of the movable knife,
wherein the storage of the angle lever serves as a parallel guide for the knife, and on the other hand the
Movement of the angle lever perpendicular to the direction of movement of the knife to transfer the spring tension to the movable knife in the position of use in FIG. 1 and 2, 1 is the handle of the drive

and part for pivoting away the movable knife. In this, in a known manner, an electronic device is built into the non-motor after the spring tension has been released, for the purpose of simplifying the position of use. In contrast to the known illustration, only the rotor shaft 2 with eccentric cutting devices is thus the carrier of the movable pin 3 is indicated. This acts on a clapper S, which is mounted in the axial direction to and fro axis 4 at the same time, which is movable while the motor is running and is pivoted to and fro in a direction perpendicular to the motor in the direction of the arrow. The storage of the knife carrier is on the upper swivel arm of the clapper 5 is extremely friction. In addition, the mandrel 6 needs to be attached, on which a sleeve 7 spring contact pressure with a running seat only needs to be so large that 25 is placed with the end 8 closed. The sleeve 7 a lifting of the knife by penetrating hair engages through a slot 11 of a handle closure is prevented. The spring contact pressure does not have to pass through plate 12. Between the sleeve 7 and at the same time the permanent superposition of the upper pivot arm of the clapper 5, a pressure guide surfaces is caused, since the perfect spring 10 is installed. The bead 9 protrudes beyond the width of the parallel guide, even when the spring is relaxed, of the slot 11 and holds the sleeve 7 in the handle. Finally, the drive points are exposed to a significantly lower risk of contamination, since the drive member on one
Lever arm of the angle lever engages and thus off

the area of action of the knives would take 35 the attachment attached to the head part. The angle lever also has bolts 16. When the head section is placed on the the advantage that the pressure spring does not directly grip the handle part, the pawls 14 in the grooves 17 of this but via a lever transmission on the knife fastening bolt, through pressure on both of them can. This makes it possible for the clamping-side parts of the pawls that are accessible from the outside The lock can easily be opened again support that even a comparatively weak one will be.

Spring gives the necessary contact pressure. The head part of the hair cutting machine has a

The spring can also be almost completely covered. 2 can be seen from

be arranged. an upper part 18 and a lower part 19

In a further advantageous embodiment of the ER- ¹ is sammengefügt 45th These two parts have flaps can find the other lever arm of the angle lever
either be designed as a movable knife
or carry the movable knife.

In an advantageous development of the invention takes effect

at the 50 cooperating with the output member. Both knives are in at the top Lever arm of the angle lever to a tension spring, which is known to be provided with teeth 24 or 25, is supported on the housing, so that on the win- The movable knife is designed so that it

Spring tension acting as a crank lever when removing only with a narrow area of the toothing of the cutting head is unlifted by the housing, which is inevitably enclosed, with the stationary knife will. This embodiment is in particular 55 indirectly in contact. It is at one point useful if it is formed as a chain-off rocker, the lower leg 23 'of which

has a groove 26 which couples with the end 8 of the clapper sleeve 7 when the head part is attached. Of the upper support part 18 has a lifted bearing tab 27 each, on which a bearing axis 28 is attached. Between, the angle of the knife seesaw

end plate 12 caught,

Sleeves 13 are let into the handle part on both sides, into the pawls 14, which are pressed by springs 15 stand, engage, the sleeves 13 are used to

20 or 21 - which in turn form a common holder for the resting knife 22 by being encompassed on both sides by these tabs. A movable knife 23 acts with the stationary knife 22

Interchangeable head designed cutting head acts in place of the shaving head of a conventional dry shaver can be set with a resilient drive clapper.

Several embodiments of the invention are explained in more detail with reference to the drawing.

Fig. 1 is a front view of a hair clipper with the cutting head lifted from the handle;

Fig. 2 is a side view of the same embodiment, partly with cut and with attached Cutting head;

23 and the bearing axis 28 balls 29 are inserted, which transmit the spring pressure to the bearing axis 28 and a rolling, d. H. Bring out frictionless radial 65 and axial movement of knife rocker 23. The diameter of the bearing axis and the ball and the size of the knife rocker 23 Angles are so dimensioned that the balls 29

5 6

are caught in the bottom of the angle. The lateral purpose at the front end of the boom 51 & play for the balls 29 will be articulated so that it can be swiveled into the angle. On the side of the base of the knife rocker embossed bulges 30, in the casual 51b a reciprocating knife 56 frame of the axial displacement is provided, which is limited by means of two eyes 56 a on a knife rocker. S axis 57 is mounted. The free ends of this axis

The size of the angle of the knife rocker 23 and 57 are each supported in an arm 58. The two, the length ratio between the upper and arms 58, each with a transverse tab 59 (FIG. 4), lower legs of the rocker can be selected on the bottom of the boom 51 &. The transverse flaps are that apart from the desired size of the 59 each have a spring pressure in the longitudinal direction of the arm ver-spring pressure at the upper knife end of the rocker ig running slot 60, through which a Beauf the stationary knife and a pressure component fastening screw 61 protrudes, by means of which the arm acts against the bearing axis 28, namely is fixed in the direction 58 on the boom 51 b. The screws 61 against the toothed end of the rocker, between the two side walls of the knife rocker 23 and the fastening of the bolts 53 on the boom 51 b serve at the same time in the example shown. Sufficient play is provided in the bearing axis 28 so that in its working position the knife rocker, which is designed as a rocker, with its narrow running surface, knife 56 with a narrow surface of its gein the area of its toothing, lies precisely on the corresponding toothed cutting part against the likewise toothed dating surface of the Align the stationary knife 22 and the cutting part of the stationary knife 52. This ensures a precise cut of the hair can thereby rock about the axis 57 perpendicular to the knife over the entire length of the mutual track, ao direction of movement. The one not drawn

Depending on the length ratio of the two legs, the drive motor expediently has a clapper, the knife rocker 23 can be the contact pressure of the tread protruding through a slot in front of the axis 57 in the boom for a given size of the spring pressure 62 and selected to be smaller or larger in a forward-projecting one will. This enables driver tabs 63 (Fig. 3) of knife 56 to be used e.g. B. in razors, 25 engages. The clapper pushes the driver massage apparatus and similar devices already flap 63 slightly upwards, so that the knife 56 drive parts present. The construction of the knife 52 standing with its cutting part, as mentioned, is pressed against the fixed head part of the hair cutting knife according to the invention. If necessary, the machine can of course also adapt a spring to increase the size of the device. On the other hand, application pressure can also be provided. After installation, it is conceivable in which the spring pressure on the cutting of the knife 56, the arms 58 and associated knives are not set on the drive part, but rather on the axis 57 in such a way that the position of other suitable locations, e.g. B. on the carrier part, section of the knife 56 is supported uniformly along the cutting edge. part of the fixed knife 52 on the latter

An adjustment 35 is located on the lower support part 19 (FIG. 2). This setting of the arms 58 is through the in Lever 31, which has a grip tab 32, on one of the tabs 59 provided slots. Axis 33 articulated. The adjustment lever 31 carries a domed cover enclosed in the groove 54 Driving pin 34, which is in a recess 35 of 55, the inner edge of which is immediately below the cutting rest Knife 22 engages. By pivoting part of the movable knife 56 ends, protects of the setting lever, the position of the stationary 40 not only the rocker bearing of the knife 56 in front of a knife §22 with respect to that of the movable urgent hair, but also operates a knife 23 Adjust wall-free sliding, especially the longer ones, within a useful range, so that the amount by which the tooth-cut hair is out of the working area of the sharpening of the stationary knife 22 those of the be * - cutting sections of the knife 52, 56. The movable knife 23 protrude, if desired a 45 cover together with the protruding side set walls of the boom as a hair catcher and

The cutting head shown in Fig. 3 and 4 has serve tub.

a carrier 51 which has a support rail 51 α for the cutting head shown in FIGS

fixed knife 52 and a boom 51 b on a carrier 81, which has a support rail 81 α for the. The knife 52 is not shown by 50 fixed knife 82 and angled from the

Means adjustable in the support rail 51a, but support rail 81 α can have cantilever 81 & protruding away,

also be firmly anchored therein or in one piece. The knife 82 is shown in FIG

exist with the carrier. On the underside of the support rail 81 α perpendicular to the toothed

at an angle from the support rail protruding arm cutting section of this knife adjustable, but two bolts 53 are attached 51b , which are also firmly anchored in it with a 55 or made of one piece

Annular groove are provided and which exist in corresponding with it. At the bottom of the boom

Plug bushings of a not shown, the drive 81 are two bolt b g 83 in F (i. 5 is only one

motor-containing handle inserted are visible) attached, which is provided with an annular groove

can. So the cutting head drawn z. B. are and the corresponding sockets of a instead of the shaving head on the housing of a 60 not shown, containing the drive motor

Dry shaver. The extension handle can be inserted. So can he

leger51 b is designed as a box that is open at the top. drawn cutting head e.g. instead of the shear

The side walls of this box boom face upside down on the housing of a dry shaver

their inside each one to be placed parallel to the boom base. The boom 81 b is designed as a groove 54 at the top, in which the edges of a box that is open with its 65 is formed. The side walls of this

the edge facing the knife 52 upwards. Box booms each have one on their inside

domed cover 55 are inserted. The cover to the boom bottom parallel groove 84 in which

55 can also be arranged so that it can be opened, and to this the edges of a

turned edge upwardly curved cover 85 are inserted. The cover 85 can also be arranged so that it can be swung open and, for this purpose, be articulated so as to be pivotable at the front end of the arm 81 &. On the right-hand side of the boom 81 &, a knife 86 movable to and fro is provided, which is mounted with its toothed cutting section 86a and a rear support section 86 & on the stationary knife 82. In the middle part of the movable knife 86 raised from the knife 82, two openings are provided, in each of which a driver 87 of a rocker arm 88 loosely engages. The rocker arm 88 is designed as a two-armed angle lever which has a working part 88 a carrying the drivers 87 and an actuating part 88 b arranged at an acute angle thereto. In the working position of the rocker arm 88 (FIG. 5), the working part 88 α runs approximately parallel to the knife 86, while the actuation part 88 & runs approximately parallel to the bottom of the boom 81 &. At the operating part 88 b engages in a manner not illustrated through a slot 81c (Fig. 6) in the bottom of the boom 81 and back and forth swinging and simultaneously b against the operating portion 88 pressing, with its axis suitably in the plane through the axes of the Bolt 83 lying clapper of the drive motor, not shown.

The rocker arm 88 is located by means of two bearings 89 pivotally and along its pivoting axis movable to and fro on a supported in the fixed support 81 axis 90. The facing away from the axis 90 of the end of the working part 88 a of the rocker arm 88 is designed as a pressure nose 91 which from the Clapper on the actuating part 88 b in the ratio of the leverage created by the parts 88 α, 88 & transfers to the movable knife 86. The end of the working part 88 α of the rocker arm 88 facing the axis 90 carries a projection 92 on the side of the knife 86. When the hair clipper described is in operation, the oscillating clapper of the drive motor moves the rocker arm 88 back and forth on its axis 90 and pushes it while the knife 86 against the stationary knife 82 via the nose 91, the knife 86 also being correspondingly moved back and forth by the driver 87, which simultaneously serves as a parallel guide. If the contact pressure transmitted from the rocker arm 88 to the knife 86 is not sufficient, an additional spring can be provided between the actuating part 88 b and the clapper or fixed arm 81 b . If the leverage ratio is expediently selected, the pressure exerted by the clapper on the rocker arm 88 is sufficient in most cases. If the knife 86 is to be removed for any reason, the cutting head is first released from its connection with the drive motor, whereupon the cover 84 is pulled off the extension arm 81 &. Since the bobbin is no longer of the rocker arm 88 presses on the actuating member 88 &, the latter b by pressure from above to the operating part 88 can be tilted so far about its axis 90 to the rear, that the drivers 87 to the corresponding recesses in the blade 86 emerge; at the same time, the projection 92 acting as an ejector presses on the adjacent end of the knife 86 and pushes it forward so that it can easily be grasped by hand and removed.

When reinserting the knife 86, the procedure is reversed; one pushes when it is tilted back Rocker arm 88 puts the knife 86 in place, with the projection 92 serving as a stop. Will now be the If the rocker arm 88 is tilted again against the knife 86, the drivers 87 engage the corresponding ones Recesses in the knife 86, as a result of which it is fixed in its working position again. Now he can Cutting head with the bolts 83 back on the as

ίο Handle-shaped drive motor attached which automatically restores the drive connection between the clapper and knife is. By sliding the cover 84 onto the boom 81 &, the movable knife and The interior of the boom containing the rocker arm is closed again, the one against the cutting section the cover 84, which is curved towards the knife, also serves as a sliding guide for the cut hair, so that the latter cannot collect and jam immediately behind the cutting section.

In the example described above, the rocker arm 88 is a one-piece two-armed angle lever educated. As FIG. 7 shows, it is also possible to design the rocker arm 98 in two parts, where working part 98 ″ and actuating part 98 ″ individually mounted pivotably and axially displaceably on the axis 120 and by a spring 99 in the sense the spreading of the two parts are loaded. A stop 121 limits the spreading movement of the two Lever parts. Here, too, the rocker arm 98 presses the knife 86 with the aid of the spring 99 both abutment surfaces against the stationary knife 82. Otherwise, this embodiment corresponds to that 5 and 6, i.e. the working part 98α engages with two drivers 87 loosely in corresponding recesses of the knife 86 and thus does not ensure only taking it along, but also its perfect parallel guidance. Here, too, is the working part 98 a a projection 92 is provided, which when removing the movable knife as an ejector and when inserting this knife serves as a stop, and the pressure of the rocker arm 98 is a Transfer nose 91 at the front end of the working part 98 a to the knife 86.

The two lever parts 98 α, 98 & can, instead of the expanding spring 120, also by a bellows ■ Or designed as a rubber-elastic intermediate layer The spring element can be held in a spread position, or the lever itself can be designed as a two-armed spring clip be.

In the examples described above, the knife 86 rests against the stationary knife 82 with two bearing surfaces lying in one plane (one on the cutting section 86 a, the other on the rearmost knife edge 86 b). This not only results in perfect storage of the movable knife, but also facilitates any regrinding of the knife bearing surfaces that may become necessary, since these can be ground over in one go.

In contrast is the movable blade 96 in the resting in Fig. Variant shown 8 only with its front portion 96 a of the fixed blade 82, while the rear, slightly recessed diameter portion 96 b on a provided on the fixed location Rangen 122 supports 123rd Here, too, the rocker arm 128 is designed as a two-armed angle lever 128 α, 128 &, which is seated on an axle 130 supported in the bearings 122.

The working part 128 α presses with a nose 91 against the movable knife 96 and engages with its drivers 87 loosely in corresponding recesses in this knife, while the projection 92 as at the examples described above as a stop or ejector for the movable knife 96 serves. The driver 87 of the rocker arm can be bent outward or on the working part of the Lever attached pins. The special pressure lug on the working part of the rocker arm can also be omitted so that the front edge of the lever presses directly on the knife.

From the foregoing it is readily apparent that the cutting heads described are simple Construction and easy to use; the rocker arm enables it by appropriate choice the lever arm length to generate the desired contact pressure of the knife, and it also ensures perfect parallel guidance of this knife.

In all of the embodiments described above, means can be provided which the Adjustment of the movable knife in relation to the fixed knife enable, as in the case of Example according to FIGS. 1 and 2 is described in more detail. But because the movable knife can also be removed easily leaves, this can also be exchanged for a smaller or larger knife, so that special adjustment means are unnecessary.

30th

Claims (15)

Patent claims: 1. Cutting head for a hair clipper with a drive motor arranged in a housing designed as a handle, wherein the cutting head is arranged on the housing and has an immovable knife and a knife movable back and forth on the latter in the longitudinal direction, both of which are unfolded relative to one another when not in use can, and wherein the movable knife is held by a carrier and resiliently pressed in its active position against the immovable knife, characterized in that the carrier of the movable knife is an angle lever enclosing an acute angle (23, 56, 88, 98, 128), which is used for Generation of the knife movement on its pivot bearing (29, 57, 90, 120, 130) parallel to the direction of movement of the knife by the drive motor acting on a lever arm (23, 63, 88 b, 98 b, 128 b) being movable back and forth and pressing against one another of the two knives in their active position under spring tension stands. 2. Cutting head according to claim 1, characterized in that the other lever arm of the angle lever (23, 56) is designed as a movable knife. 3. Cutting head according to claim 1, characterized in that the other lever arm of the angle lever (88, 98, 128) carries the movable knife (86, 96). 4. Cutting head according to claim 1 as a cutting head removable from the housing, characterized in that that on the lever arm (23) of the angle lever which cooperates with the output member (8) (23) engages a tension spring (10) which is supported on the housing (1) so that the on the Spring tension acting as an angle lever when removing the cutting head from the housing will be annulled. 5. Cutting head according to claim 3, characterized in that the knife-carrying arm (88 a, 98 a, 128 a) of the angle lever two in at least one corresponding recess in the movable Knife (86, 96) has loosely engaging driver (87), which at the same time the parallel guide serve the movable knife. 6. Cutting head according to claim 5, characterized in that the knife-carrying arm (88 a, 98 a, 128 a) of the angle lever a cooperating with the movable knife (86,96), projection (92) serving as an ejector and stop for this knife is provided. 7. Cutting head according to claim 5, characterized in that on the knife-carrying arm (88 a, 98 a, 128 a) of the angle lever there is provided a pressure nose (91) which engages between the knife edges and the driver recess and which cooperates with the movable knife (86, 96). 8. Cutting head according to claim 1, characterized in that the two arms of the angle lever (23, 56, 88, 128) form one piece. 9. Cutting head according to claim 1, characterized in that the two arms (98 α, 98 b) of the angle lever (98) are two separate, mutually limited pivotable parts which are held in the spread position by a spring (99). 10. Cutting head according to claim 1, characterized in that the axis (57, 90, 120, 130) of the angle lever (56, 88, 98, 128) on the box-shaped arm of a carrier (51, 81) for the fixed knife (52, 82) is supported, the boom by a against the cutting part the knife concavely curved removable cover (55, 85) is closed at the top. 11. Cutting head according to claim 1, characterized in that the movable knife (86) both in the region of its cutting part (86 a) and in the region of its edge part remote from the latter (86 b) each with a bearing surface lying in a common plane rests on the stationary knife (82). 12. Cutting head according to claim 1, characterized in that the position of the pivot axis (57) of the knife carrier (56) is variable in a plane leading through this axis. 13. Cutting head according to claim 12, characterized in that the knife carrier (56) by means of two eyes (56 a) is mounted on such an axis, which at their ends by arms (58) is carried, which is perpendicular to the plane of the fixed Knife (52) independently adjustable on the fixed cutting head part (51) are attached. 14. Cutting head according to claim 13, characterized in that the fixed knife (52) is arranged on the carrier (51), which has means for detachably fixing the cutting head on the housing of the drive motor and an arm protruding at an angle from the fixed knife (52) (51 b) on which the arms (58) are adjustably attached. ,, ......, 609 539/59 1-1 12 15. Cutting head according to claim 14, characterized in that the documents considered: characterized in that the boom (51 b) of German Patent Nos. 227 598, 1062 576; Carrier (51) as a rocker knife bearing Swiss Patent No. 353 651; female housing defined by French Patent No. 1,058,273; the lid designed as a hair collecting basin ^: 5 USA patents No. 1 997 096, 2 146 298, (55) is complete. . 2,542,378, 2,614,323. 1 sheet of drawings 609 539/59 3.66 © Bundesdruckerei Berlin