JPS5811347Y2 - safety razor - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a safety razor in which a replaceable blade cartridge can be attached to and detached from a holder.

In conventional safety razors of this type, a button operation is required to engage the hook-shaped engagement protrusion that is bent inwardly at right angles on the tip of the support arm of the holder into the retaining hole of the replaceable blade cartridge. The support arm is opened in advance, the two are placed in a position where the engagement protrusion can engage with the engagement hole, and the support arm is closed and engaged.

Therefore, its installation was extremely troublesome.

Further, the support arm is made of synthetic resin and integrally molded with the holder, and the flexibility of the support arm is used to expand the support arm by operating a button.

Therefore, in this type of safety razor in which the replaceable blade cartridge is replaced many times, the support arm itself suffers from severe fatigue, which poses a problem in the durability of the holder.

This invention was developed by focusing on the problems existing in the above-mentioned prior art, and its purpose is to eliminate the need for opening and closing the support arm when engaging the retaining protrusion with the locking hole. The replacement blade cartridge can be reliably attached to the holder with a single touch by simply pressing the retaining protrusion against the engagement part, and the support arm is elastically supported by a spring member, making the holder durable. Our goal is to provide you with a safety razor that can.

Hereinafter, one embodiment of the safety razor of this invention will be described with reference to the drawings. Reference numeral 1 denotes a holder consisting of a handle part 1a and a support part 1b, and the support part 1b has a pair of guide protrusions in the center of the front surface. 2 is provided protruding toward the front.

Reference numeral 3 denotes a support chamber formed in the support part 1b so that both sides are open, and the front surface thereof has a width between the guide protrusions 2 at the center, and a guide penetrating the inside and outside of the support chamber 3. Hole 4a
are transparently provided, and separated by a front wall 4 having a stopper surface 4b formed at both ends, and a sliding hole 5a passing through the support chamber 3 is provided in the center of the rear surface. They are separated by a rear wall 5 on which a stopper surface 5b is formed.

Reference numeral 6 denotes a sliding groove recessed longitudinally in the center of the bottom of the support chamber 3, 7 a support pin formed near both sides of the support chamber 3, and 8
is a stepped portion formed on the upper surface of the front end portion of the support chamber 3.

Reference numeral 9 denotes an operating member that is fitted in the sliding groove 6 of the support chamber 3 so as to be movable back and forth, and the sliding hole 5 of the rear wall 5 is located at the rear of the operating member.
A push button part 9a is formed whose rear end protrudes from the rear surface of the support part 1b, and a planar ladder-shaped engagement recess 9b is formed at both front ends of the push button part 9a.

Reference numeral 10 denotes a spring receiving chamber transparently installed in the center of the operating member 9, and a spring receiving projection 10a is protruded from the rear wall.

Reference numeral 11 denotes a support groove recessed in the upper surface of the operating member 9 in front of the spring receiving chamber 10 .

Reference numeral 12 denotes a pusher whose front end is slidably guided by the guide protrusion 2 and the guide hole 4a, and whose rear part is slidably supported by the support groove 11, and the rear end has a spring receiving part that projects rearward. 12a, and stopper portions 12b protruding laterally are formed on both sides of the base end of the spring receiving portion 123.

Reference numeral 13 denotes a locking protrusion protruding from the upper surface near the front end of the pusher 12, which restricts the forward movement of the pusher 12 by being locked to the stepped portion 8 on the upper surface of the support chamber 3.

14 is a spring receiving protrusion 10a of the operating member 9 and a pusher 12;
This is a coil spring interposed between the spring receiving part 12a and the pusher 12, and its front end contacts the rear surface of the stopper part 12b of the pusher 12, thereby urging the pusher 12 forward.

Reference numeral 15 denotes a pair of L-shaped support arms rotatably attached by the support pins 7 so as to protrude forward from both sides of the support chamber 3. An engaging protrusion 16 having an oblique sliding surface 16a that descends rearward is provided protrudingly, and is engaged with the engaging recess 9b of the operating member 9 only from the front and back directions on the inner side of its base end. A locking convex portion 15a is provided in a protruding manner, and a step-shaped abutment portion 15b is cut out in the new outer curved portion of the support arm 15.

Note that the corners of the front end surface of the support arm 15 and the rear surface of the engagement protrusion 16 are chamfered in an arc shape.

Reference numeral 17 denotes a replaceable blade cartridge which is swingably attached to the holder 1 and has a blade mounted therein, and has a dogleg-shaped abutment in the center of its rear surface to which the front end of the pusher 12 is pressed. A press-contact convex portion 18 having a contact surface 18a is provided in a protruding manner, and the support arms 15. An engagement hole 19 into which the engagement protrusion 16 is engaged from the outside.
a and an inclined sliding surface 1 that descends outward on the rear surface.
An engaging portion 19 having 9b is provided in a protruding manner.

Next, the operation of the safety razor constructed as described above will be explained.

First, the support arm 15 is engaged with the engagement recess 9b of the operating member 9 so that the tip thereof is pinched only from the front and rear directions, so that the support arm 15 can be operated against the elastic force of the spring 14. Not only does the support arm 15 open when the member 9 is moved forward, but also the operation member 9 can be moved forward against the force of the spring 14 even when a force is applied to the support arm 15 to open it. can.

Now, as shown by the solid line in FIG. 2, when the holder 1 is pressed against the cartridge 17 in the direction of the arrow, the support arm 1
The sliding surface 16a of the cartridge 17 is the sliding surface 19b of the cartridge 17.
Both surfaces 16a are pressed against each other.

19 b is oblique, so that the support arm 15 has a spring 14
It opens in the direction of the arrow in the same figure against the force of , and becomes the state shown by the chain line in FIG.

When the holder 1 is further pressed against the cartridge 17, the support arm 15 is moved as shown by the chain line in FIG.
The engagement protrusion 16 is engaged with the engagement hole 19a of the cartridge 17, and the support arm 15 is returned to the state shown by the solid line in the figure by the elastic force of the spring 14, and the support arm 15 is returned to the state shown by the solid line in the figure. The inner surface of the support arm 15 is locked to the stopper 4b.

Also, at this time, the pusher 12 is pressed by the abutment surface 18a of the cartridge 17 and retreats, while applying a forward urging force to the cartridge 17.

Further, since both the front end surface of the support arm 15 and the rear surface of the engagement protrusion 16 are chamfered in an arcuate manner, the cartridge 17 can swing relative to the holder 1 smoothly.

Next, in order to remove the cartridge 17 supported by the holder 1 as described above, press the pressing part 9a of the operating member 9,
When the operating member 9 is pushed forward against the elastic force of the spring 14,
As shown by the solid line in FIG. 4, the support arm 15 opens until its contact portion 15b is engaged with the stopper surface 5b of the rear wall 5 of the support chamber 3, and is separated from the engagement hole 19a of the replaceable blade cartridge 17. do.

Then, the cartridge 17 separates from the holder 1 due to the urging force of the pusher 12 and flies forward.

Furthermore, in the above description, the cartridge 17 is attached to the holder 1.
When installing the cartridge 17, the holder 1 was pressed against the cartridge 17 with the support arm 15 closed. The cartridge 17 may be attached to the holder 1 in an open state.

In this embodiment, the engaging portion 19 is simply replaced by the engaging protrusion 16.
The cartridge 17 can be attached to the holder 1 with a single touch by simply pressing the cartridge 17 against the holder 1, and since the support arm 15 is elastically supported by the coil spring 14, the cartridge 17 is more durable than the conventional method, and the cartridge 1
7 can be attached to the holder 1.

Note that this invention is not limited to the above-mentioned embodiment, and the sliding surface 16a of the engagement protrusion 16 may be formed into an arcuate slope, or the pair of engagement protrusions 16 may be shaped to protrude outward from each other, etc. , any changes can be made without departing from the spirit of this invention.

As detailed above, this idea is designed to allow the replacement blade cartridge to be attached to and removed from a pair of support arms that protrude forward on both sides of the holder, which are attached to the tip of the holder so that they can be opened to both sides. In the safety razor, an engaging portion is provided on a surface of the replaceable blade cartridge facing the support arm, the engagement portion having a retaining hole through which a hook-shaped engagement protrusion at the tip of the support arm can be engaged and detached. , on at least one of the mutually opposing surfaces of the engagement protrusion and the retaining part, the retaining protrusion has an oblique sliding surface that extends down the distal side column thereof, and the retaining part has an oblique sliding surface that extends down the proximal side column of the retaining protrusion. A spring member is installed in the holder to form an oblique sliding surface and to bias the proximal ends of the pair of support arms so that the tips of the pair of support arms always engage with the retaining portion side of the cartridge. By arranging the blade cartridge in the holder, there is no need to open or close the support arm when attaching the blade cartridge to the holder. Simply press the engagement protrusion against the retaining part and the blade will slide back and forth between the two. The replacement blade cartridge can be reliably attached to the holder with a single touch, and the support arm is elastically supported by a spring member, making the holder durable, making this a practical idea for safety razors. It is.

[Brief explanation of the drawing]

Figures 1 to 4 show an embodiment of the safety razor of this invention, Figure 1 is a partially cutaway perspective view showing how the replaceable blade cartridge is attached to the holder, and Figure 2 is the replaceable blade cartridge. FIG. 3 is a side sectional view of the main part showing a method of attaching the cartridge to the holder, FIG. 4 is a plan sectional view of the main part showing the support arm in an open state.

Claims (1)

[Scope of Claim for Utility Model Registration] A pair of support arms that are attached to the tip of the holder so that they can be opened to both sides, and that protrude forward on both sides of the holder, so that the replaceable blade cartridge can be attached to and removed from them. In the safety razor, an engagement portion is provided on a surface of the replaceable blade cartridge facing the support arm, the engagement portion having a retention hole through which a hook-shaped engagement protrusion at the tip of the support arm can be engaged and detached. At least one of the mutually opposing surfaces of the mating protrusion and the engaging part is provided with an oblique sliding surface extending down the distal side column of the retaining protrusion, and an oblique sliding surface descending the proximal column of the retaining protrusion with the engaging part. A spring member is disposed in the holder to form a sliding surface and to bias the proximal ends of the pair of support arms so that the tips of the pair of support arms always engage with the engaging portion side of the cartridge. A safety razor characterized by: 2. Claims for registration of a utility model characterized by a trowel formed such that the engagement hole and the engagement protrusion are rotatably engaged so that the replaceable blade cartridge can be swung relative to the holder. A safety razor as described in paragraph 1. 3. The spring member always moves the operating member disposed on the holder to the tip of the holder so that the engagement convex portions protruding inward from the base end of the support arm engage the engagement recesses formed on both sides of the front end. The safety razor according to claim 1 of the utility model registration, characterized in that the razor is biased so as to protrude from the rear surface. 4. The engagement protrusions of the pair of support arms each protrude inward so that the engagement with the retaining hole of the replaceable blade cartridge is disengaged when the arms are opened, and the engagement protrusions of the pair of support arms are respectively protruded inwardly, and the engagement protrusions of the pair of support arms are disengaged from the retaining hole of the replaceable blade cartridge when the arms are opened. The safety razor according to claim 3, wherein the pair of support arms is configured to open when the member is pressed forward against the member. 5. A utility model according to claim 3, characterized in that the spring member is disposed in a spring receiving chamber in the center of the operating member, and the support arm is biased through the operating member. safety razor.