DE1170280B - Razor - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Boarding school Class: B 26 b

German KL: 69-12 / 02

Number: 1 170 280

File number: N 20874 I c / 69

Filing date: November 27, 1961

Opening day: May 14, 1964

The invention relates to a shaving device with a housing, a protective part provided with openings, a cutting element moving relative to this, a drive motor for the cutting element and a switching device for the motor.

The protective part of the shaver is generally in the form of a foil plate with an outer, to be placed on the face to be shaved.

In such shavers, the drive motor, which is a rotating electric motor or a vibrating armature motor can be put into operation and switched off by a switching device, the has a manually operable switching element, which is between an "on" position - in which the Cutting element is driven - and an "off" position - in which the cutting element stands still - is movable. In the case of using an electric motor, the switching device normally has an electrical switch on, and the hand-operated part is operated by a finger piece formed between "on" and "off" positions relative to the housing of the shaver on which the Switch is normally attached, is movable.

One of the disadvantages of this known arrangement is that energy from the driving force of the motor Energy source (e.g. an electrical supply device or, in the case of a clockwork motor, a tensioned one Spring) is consumed, regardless of whether the protective part touches the surface to be shaved or not. Accordingly At certain times, energy is wasted driving the cutting element while the the latter is in contact with the inner surface of the protective part.

In addition, when operating under the latter condition, the lubrication is decreased or absent at all, those between the touching and relatively movable surfaces of the Protective part and the cutting element as a result of the introduction of lubricating components of the Skin and hair of the area to be shaved. This not only increases friction on the movement of the cutting element and thus increases the energy consumed even further, rather also leads to increased abrasion on the contact surfaces the protective part and the cutting element.

Devices are already known in which the switch of the device motor is caused by the handling the device handle is operated. In particular, a dry shaver is also known, which is in a container together with a switch of such an arrangement shaver

Applicant:

Needle Industries Limited, Birmingham, Warwick (Great Britain)

Representative:

Dr.-Ing. K. Boehmert

and Dipl.-Ing. A. Boehmert, patent attorneys,

Bremen 1, Feldstr. 24

Named as inventor:

Norman Thomas Sanders, Studley, Warwick

(Great Britain)

Claimed priority:

Great Britain 28 November 1960 (40 742)

The net is that the device is switched on automatically when it is removed from its shelf. These well-known However, devices have the disadvantage that they are already switched on when the actual function the device has not yet started, d. This means that energy is already being consumed when the protective part closes has not yet touched the shaving area.

In order to avoid this disadvantage, according to the invention the protective part should be attached to the housing in such a way that that it is movable relative to the housing substantially in such a direction that at least one has a perpendicular component to that surface of the protective part which is connected to the body surface to be shaved comes into contact, the switching device controlling the motor through the protective device can be actuated when it is pressed against the surface of the body to be shaved.

The protective part can be arranged movably preloaded against a spring in such a way that it allows the movement of the protective part when pressure occurs between it and the surface to be shaved opposed increasing resistance. This corresponds to that relative position of the protective part to the housing of the shaver, in which first a relative movement between the cutting element and the protective part is caused, a predetermined minimum value of contact pressure of the Protective part against the surface to be shaved.

409 589/42

This measure in the shaving device according to the invention is of particular advantage in that it is achieved an effective shave from maintaining a minimum contact pressure between the Protective part and the area to be shaved is dependent.

A shaving device equipped with this feature of the invention can therefore not do otherwise than in this one State to be put into operation.

In a shaving device of the type mentioned, in which the drive motor is an electric motor and the Control device contains an electrotechnical switch, the switch, its mutually movable Contacts for establishing or disconnecting the electrical power connection to the motor as a function of serve from the movement of the protective part movable by the skin contact protection, in addition have a finger piece of such design and arrangement that in one position of the Finger piece to the motor regardless of the position, which the contact pressure protection on the protective part take affected contacts. Electricity is supplied.

Another feature of the invention is that when the protective part is relatively movable to Housing of the shaver is received in the prescribed manner, which carries the protective part Part is mounted between several deformable support members so that the support members the protective part Center the load-bearing part transversely to its axial direction, but move the protective part in Allow direction of the axis.

In a preferred embodiment, the protective part, the drive motor and the cutting element are assembled as a unit with such a design of the deformable support members that the sliding friction is lowered between the unit and the housing.

The invention is illustrated below with reference to the drawings using an exemplary embodiment, namely shows

F i g. 1 shows a longitudinal section through the housing of a shaving device according to the invention, seen from the side,

F i g. Fig. 2 is a partial plan view showing the shape of the resiliently deformable support members which are used on upper end of the shaving head can be used to position it relative to the housing hold or center,

Fig. 3 is a section along the line 3-3 in Fig. 2, Fig. 4 is a section along the line 4-4 in Fig. 2,

Fig. 5 is an enlarged perspective partial view of the arrangement of conductor parts and shaving pressure and manual actuation contacts of the switching devices through which a supply circuit of the Battery of the shaver is made to its motor; and it show the

F i g. 6, 7, 8 and 9 circuit diagrams with the different positions of the switches.

The in Fig. The housing of the shaving device shown in FIG. 1 can have an elongated, cup-shaped lower part 10, which in section is either substantially elliptical or of some other suitable shape can be. In the former case, the major axis of the ellipse is arranged in the sectional plane of FIG. 1.

The housing also comprises an upper part 11 with a chamber 12 in which a "shaving head" designated unit is mounted in such a way that it extends within certain limits in its longitudinal direction can move. The upper and lower parts of the housing are connected to one another by a generally plate-shaped intermediate member 13 connected, the parts of the switch and the springs receives, which bias the shaving head axially upwards and center its inner end and keep. The parts 10 and 11 can be molded parts made of synthetic resin or molded parts.

The intermediate member 13, for example a metal cast piece, is not shown on the upper part Screws fastened, which are arranged near the circumference of the intermediate link and in threaded bushings are introduced, which inserts in the pressing piece of the upper part 11 are.

The lower part 10 is fastened to the intermediate member by a screw 14 which passes through the chamber 15 of the lower part. The cells 16 forming the battery are accommodated in the chamber.

The shaving head has an electric drive motor 17 with a stator housing. The stator housing has end parts 18 and 19, which with a middle part 20 by the usual, spaced around the circumference arranged tension bolts or screws 21 are assembled. The end part 19 is with a protruding flange 22 is provided which forms part of the side wall of a chamber 23 into which the Armature shaft 24 of the motor protrudes. The anchor is designated by 25 as a whole.

A cutting element 26 is fastened to the armature shaft and has the shape shown, for example in which the cutting element includes a support plate 27 resting on a square end portion 28 is attached to the armature shaft and has two frustoconical blades 29.

The ends of the blades with the larger diameter are punched with a Protective part 30 kept in contact. At the circumference of the protective part 30 this is with the help of an inner Ring 31 and an outer ring 32 held, the latter overlapping the flange 22 on the outside. The contact pressure between the cutting element 26 and the protective part 30 is provided by a helical compression spring 33 maintained, which acts between the support plate 27 and a sleeve 34 that the Armature shaft 24 engages.

The outer ring 32 is preferably provided with an annular groove or recess on the inside, which receives a sealing ring 35, which protrudes slightly radially inward, so that he at Butting against the flange 22 is deformed. The outer ring 32 can be a sliding fit on the Have flange 22 so that it can be pulled off together with the protective part, if necessary To provide access to the cutting element.

The entire shaving head, i.e. H. the unit comprising the motor, the cutting element and the protective part, is axially movable in the chamber 12, which is generally cylindrical in shape. The shaving head is located at a distance from the walls

6u den this chamber, creating a sliding contact and thus frictional resistance to the movement of the unit is eliminated. The storage takes place with the aid of one or more elastically deformable support members supporting the unit.

In the illustrated construction, two of these links are used, namely an upper support member 36, that is shown in detail in FIGS. 2 to 4 is shown and has the shape of a ring, while the lower

Support member 37 has the shape of a plate made of spring metal and is generally rectangular, the longer Dimension in the in F i g. 1 shown section plane runs.

The plate or the support member 37 is centrally provided with an opening and takes at the bottom A bearing housing 38 on the end of the motor with a tight sliding fit. The whole unit is through one Helical compression spring 39 pressed upwards. The spring is fitted over the bearing housing 38 and on received their lower end in a base 40. This is located in a threaded one Plug 41, which is in a threaded hole of the intermediate member with the help of a screw slot

42 can be rotated, whereby the amount of tension in the spring 39 is to be adjusted. It must thus a predetermined contact pressure, which is determined for the most effective shave, can be achieved, before the shaving head is moved into a position that puts the shaver into operation (if it is on “Pressure shave” is set), as will be described below.

The support member 36 can be made of synthetic resin, preferably nylon, with a certain elasticity Deformability be made.

The support member 36 includes an annular ridge

43 with one-piece rib 44 that extends in a sinusoidal manner. With the sinus-like course of the rib

44, the inner and outer boundaries coincide with the inner and outer peripheral interfaces of the web 43 coincide, and buckling or undesired distortion of the web 43 is prevented.

The support member 36 is not only used to center the unit in the radial direction to the axis of Chamber 12, but also allows axial movement of the unit and creates a seal between the end portion 19 of the stator housing of the motor and the side wall of the chamber 17, so that no hair or other particles in the space between the unit and the side wall of the Penetrate chamber and find their way into the switching devices described below can.

The support member 36, which can be seen between an axial surface 45 of the end part 19 and an axial opposite surface 46 is arranged on the inwardly directed flange 47 of the upper part, acts also as a stop limiting the axial upward movement of the unit.

The control devices used to control the supply of power from the battery to the motor have the design of a switch 48. In the particular embodiment shown This includes influenceable by the contact pressure during shaving contacts that are used to produce a Circuit from the battery to the motor are closed when the protective part 30 is in contact with the area to be shaved (for example the face of the user) and a sufficient one Pressure is exerted which moves the shaving head axially inward against the pressure of the spring 39.

The switching devices also include additional contacts, which are referred to below as contacts provided for manual switching and which, in suitable settings of a finger piece 48 α, establish the circuit from the battery to the motor regardless of the position assumed by the shaving head and - if necessary - the circle of from the battery to the motor regardless of the position of the shaving head. The mode of operation of the switching devices is most expediently illustrated using the methods shown in FIG. 6 to 9 illustrated circuit diagrams explained. One pole of the battery B, for example the negative pole, is connected to a brush terminal of the motor 17 by a conductor 49. The other pole of the battery, for example the positive pole, is connected to a contact 50 provided for manual switching, which is spaced from two further contacts 51 and 52 provided for manual switching.

A contact bridge 53, which is C-shaped, is carried by the finger piece and made possible - if necessary - a bridging between the contacts 50 and 51 or between contacts 50 and 52.

One of the contacts that can be influenced by the shaving pressure is indicated at 54. The counterpart forms a fixed contact 55 which is part of a conductor. The contacts 50 and 51 are as parts of the Conductors 57 and 58 formed.

In the in F i g. 6 position of the contact bridge shown 53 is the circle between the contacts 50 and the two contacts 52 and 51, whose the latter is connected to the contact 54, and accordingly no current is fed to the motor fed, regardless of whether the contacts 54 and 55 are open or closed.

In Fig. 7, the contact bridge bridges only the contacts 50 and provided for manual switching 51, but the current is still separated from the motor in that the can be actuated by the shaving pressure Contacts 54 and 55 are open.

F i g. 8 shows the position in which the motor forming part of the shaving head has been displaced axially inward and closes the contacts 54 and 55, which can be actuated by the shaving pressure, so that the circuit from battery B to the motor is closed. In the in F i g. 9 the position of the contact bridge 53 shown, a circle is closed between the contacts 50 and 52 provided for manual switching, and current is accordingly supplied to the motor, irrespective of whether the shaving pressure contacts 54 and 55 are opened or closed as shown.

F i g. 6 therefore represents the "off" position of the finger piece 48a, FIGS. 7 and 8 the shaving pressure position of the finger piece and Fig. 9 shows the "on" position of the finger piece, which the latter is used when you want to shave without pressure.

Fig. 5 shows the arrangement of the conductor parts and contacts of the switching devices. The negative pole of the battery is connected to one of the brush terminals 59 of the motor via conductor 49. The conductor 49 comprises a lower portion 49 a, which makes contact between the upper terminal of one of the battery So cells, an intermediate portion 49 b which extends upward through an opening in the intermediate member 13 and against this through one in the opening arranged sleeve is insulated from insulating material, and an upper portion 49 c which ends in an arm 49 d attached to the brush terminal 59 of the motor.

The cells 16 of the battery, of which there may be four, are electrically connected to one another

Connected in series. To bridge the contacts at the lower ends of two pairs of cells are Conductor strips 60 and 61 are provided at the lower end of the chamber 15 and are by suitable Recesses or formations are held in the bottom wall 62 of the lower part 10. At the top At the end of two of the cells (one of each of the pairs mentioned) these are characterized by a similar, Conductor strips, not shown, are connected and isolated from the intermediate member 13.

The positive pole of the battery is with the lower portion 57 a of the conductor 57, which is one through an opening in the intermediate member 13 extending and against this in the same way as the conductor

49 isolated intermediate section 57 b and an upper section 57 c , which is in a contact

50 ends in conjunction. This can in the manner shown as an upwardly directed partially cylindrical Approach of the strip 57 be formed.

The conductor 58 ends in a similar contact 51 so and is via the conductive intermediate member (which is indicated for this purpose schematically by the part 63) with the lower contact 54 of the contact pair 54, 55 which can be influenced by the contact pressure. This Contact is in FIG. 5 shown as a rod for the sake of simplicity, FIG. However, 1 shows it in more detail than one upward through a threaded hole in the intermediate member 13 extending screw, which under a section of the conductor 56 which, for example, has the contact 52 at its free end having.

The conductor 56 is supported by the motor by means of a fastening element, for example a rivet 64, but is insulated from the motor. The rivet 64 extends into the end part 18 of the stator housing of the motor and there has a curved extension 56 α , the end of which is connected to the other brush terminal 65 of the motor.

The parts of the conductors 57 and 58 with the contacts 50 and 51 are arranged in the chamber 48 and are at a distance above the bottom wall (Fig. 1) so that they are able due to the elasticity of the metal strips of which they are made to maintain pressure contact with the contact bridge 53. The lower arm 53 a of the contact bridge 53 slides over the contact points of the contacts 50 and 51, and its upper arm 53 b slides on the underside of the contact 52.

Instead of being integral with the strips, all contacts can also have special contacts, which are attached or riveted to the strip or attached to this by fusing.

The contact bridge 53 has a housing part 66 made of a suitable insulating material from which the plunger 67 of the finger piece protrudes and ends in a section 68 of arched shape. This is located outside the housing of the shaver. The finger piece with the housing of the The contact bridge is guided in an arc shape at the top and bottom by guide ribs 69, 70. These ribs delimit a slot between the intermediate member 13 and the upper part 11.

If the resilient conductor 56 is given a bias, its contact 52 between the upper arm 53 b of the contact bridge and the upper wall of the chamber 48 remains practically immobile even with an axial displacement of the shaving head. A movement of the conductor 56 caused by the displacement of the shaving head is then wholly or predominantly a pivoting movement around the contact point of the resilient conductor 56 on the upper part 11 near the actual contact 52.

Accordingly, the contact pressure remains between the contact bridge 53 and the various for the Manual switching provided contacts 50 to 52 by opening and closing the by the Shaving pressure influenceable contacts 54 and 56 almost unchanged. A relative movement to the opening and closing of the contacts 54 and 56 takes place in a direction transverse to the plane in which the contact bridge slides when causes contacts 50 and 51 or 51 and 52 to close as desired shall be.

Instead of the embodiment shown and explained above, the pressure-sensitive Contact may be arranged separately from the protective part 30 so that it is the area to be shaved directly touched near the protective part and thereby an actuation of the influenceable by the shaving pressure Contacts 54 and 55 causes.

In addition, in a shaving apparatus in which the drive motor is a clockwork motor, the pressure-sensitive contact, regardless of whether it is in the form of a sliding protective part or complete Shaving head or a separate part has to control a brake that works on a rotating Attacks part of the clockwork motor and can be detached from it, thereby stopping or starting of the motor depending on the pressure contact of the protective part with the one to be shaved Area is effected.

Claims (10)

Patent claims: 1. Shaving device with a housing, a protective part provided with openings, a relative to this moving cutting element, a drive motor for the cutting element and a Switching device for the motor, characterized in that the protective part (30) so on Housing (11) is attached so that it is relative to the housing substantially in such a direction is movable, the at least one perpendicular component to that surface of the protective part which comes into contact with the area of the body to be shaved, which is the motor (17) controlling switching device (54, 55) can be actuated by the protective device (30) when this is pressed against the body surface to be shaved. 2. Shaving implement according to claim 1, characterized in that the protective part (30) against a Spring (39) is arranged movably pretensioned in such a way that this is due to a pressure between the protective part and the surface to be shaved occurring movement of the protective part opposed an increasing resistance, in such a way that the relative position of the protective part to the housing of the shaver, in which first a relative movement between the cutting element (26) and the protective part (30) is caused, a predetermined minimum value corresponds to the contact pressure of the protective part against the surface to be shaved. 3. Shaving implement according to claim 1 or 2, wherein the drive motor is an electric motor and the control device contains an electrotechnical switch, characterized in that the switch, its mutually movable contacts (54, 55) for establishing or disconnecting the electrical power connection to the motor (17) as a function of the movement of the protective part (30 ), additionally has a finger piece (48 d) of such a design and arrangement that in one position of the finger piece the motor (17) is independent of the position which the contacts (54, 55) influenced by the contact pressure on the protective part (30) take, electricity is supplied (Fi g. 9). 4. A shaving implement according to claim 3, wherein the housing has a chamber for a battery forming the energy source of the motor, characterized in that the switches in addition to the contacts (54, 55) which can be influenced by the contact pressure on the protective part (30) have an ao or contain several manually operated contacts (50, 51, 52) arranged in such a way that they close or open the feed circuit from the battery (B) to the motor (17), depending on whether the finger piece (48 a) is in its "on" - or in its "off" position (Figs. 6 to 9). 5. Shaving implement according to claim 4, characterized in that at least one of the through the contact pressure on the protective part (30) influenceable contacts (54,55) and / or the manually operated Contacts (50 to 52) as part of the feed circuit is a resilient conductor (56) which, in Depending on the contact pressure on the protective part (30) movable, the starting point for the manually operated contacts (50 to 52) approximately at its least elastic evasive Position (Fig. 5). 6. Shaving implement according to claim 5, characterized in that the resilient conductor (56) as Strip is formed around an axis to be thought of near the actual contact (52), where it is held by a holding member on the housing of the shaver or with this in Engagement is, is pivotable. 7. Shaving implement according to claim 6, characterized in that the switch has at least two at a distance from the contacts (50 to 52) provided for manual switching, between which a contact bridge (53) can be inserted in such a direction that is parallel or runs approximately parallel to the main direction of extension of the resilient conductor (56). 8. Shaving implement according to one of claims 1 to 7, characterized in that the the Protective part (30) bearing part between several deformable support members (36,37) so mounted is that the, support members center the part carrying the protective part transversely to its axial direction, however, allow movement of the protective part in the direction of the axis. 9. Shaving implement according to claim 8, characterized in that that the protective part (30), the drive motor (17) and the cutting element (26) are assembled as a unit in such a design the deformable support members (36, 37) that the sliding friction between the unit and the housing is reduced (Fi g. 1 to 4). 10. A shaving implement according to claim 9, characterized in that the protective part (30) first lying deformable support member (36) a non-perforated ring made of elastically deformable Is material that is at the same time a seal between the housing and the unit. Considered publications:
German Patent No. 328 833;
German utility model No. 1 782138;
U.S. Patent No. 1356663. 1 sheet of drawings 409 589/42 5.64 © Bundesdruckerei Berlin