US 2429437 A
Description (OCR text may contain errors)
Oct. 21, 1947. i l M. J. WALKER 2,429,437
/ TOOTHBRUS H Filed May 25, 1945 Patented Oct. 21, 1947 UNITED STATES PATENT OFFICE TOOTHBRUSH Maurice J. Walker, United States Army Application May 25, 1945, Serial No. 595,821v
This invention relates generally to brushes, and more particularly to a tooth brush including a brush unit adapted to be selectively changed from one configuration to another.
One of the objects of the invention is to provide a brush unit which is readily adjustable manually, at will, to be adapted for cleaning either the inside or outside ofthe teeth.
Another object is to provide a novel tooth brush including a brush unit in the form of a removable and renewable insert having a flexible back portion adapted to -be slidably mounted in a holder, in combination with actuating means adapted to slide and flex the brush head to alter the same from a concave to a convex configuration.
Other objects and advantages of my invention will be apparent as it is better understood from the following description, which, taken in connection with the accompanying drawing, forms one embodiment thereof.
In the drawing:
Figure 1 is a front elevational view of the novel tooth brush assembly.
Figure 2 is a side View of the same partly in elevation and partly in cross section, showing the brush set for use with the bristles concave.
Figure 3 is a side view similar to Figure 2, but showing the brush set for use with the bristles convex.
Figure 4 is a cross sectional view taken across the brush holding portion of the handle along the line 4--4 of Figure 1.
Figure 5 is a cross sectional view taken across the handle along the line 5-5 of Figure l.
Briey the present invention relates to a tooth brush, which comprises a hollow handle having a frame or skeleton head portion with a anged over end adapted to receive detachable and renewable exible brush inserts of different bristle shapes and designs which may be pivoted at one end in the head portion, and a reciprocable actuator rod extending through the handle having a hooked-end slidable under the flanged over end of the head portion and adapted to hook over the other or free end of the iiexible brush insert, whereby the brush may be flexed upwardly from the head portion to provide, for example, a convex brush surface, or returned t a normal position to provide a concave brush surface.
Referring to several parts specically by reference numerals, the invention comprises a handle I0 having a hollow bore through which extends an actuator shaft II. This shaft extends from the handle I D into and across the Claims. (Cl. 15-172) 2, length of a frame-like head portion I 2 preferably formed integral with the handle.
The bottom of the head portion I2 is counter, sunk to receive a detachable brush head I4, and is frame-like because it is provided with an elongated slot defined on each side by rails I3 and upwardly extending flanges I5 and I6', and dened by a turned over iianged portion IT andA a, wall i8 at each end, note Figs. 1, 3 and 4.
The, actuator shaft II protrudes from the hollow handle l0 through the wall I8 across the length of the slot and under the anged portion I'I at the outer end of the head portion I2. On the outer end of the shaft I I, which is preferably flat at this point is a hook 29. This hook slides back and forth under the flanged over portion II, as the shaft Il is caused to slide in or out from the head I2, and hooks over the end of brush head I4, which is flexible and resilient.y Sliding movement is imparted to the shaft II by manipulation of a finger piece 22 swiveled to the end of the shaft against the resiliency of the brush head I4, which is pivoted at the inner end of the head I2 on a pin 23 mounted ibetween iianges I5 and I6.
Provision is made for holding or locking the shaft l I against the action of the resilient brush at an inward position with respect to they head frame I2, by forming the end of the handle Ii) with a V-notch, defined by diverging arms 25 and 26 (see Figure 1) and by cooperatively tapering the inner portion 2i of the ringer piece, 22 to seat and flt in the apex of the notch between the arms, or at an outward position by forming a pair of relatively smaller V-notuches 28 and 29 across the ends of the diverging arms 25 and 26 at right angles to the rst notch.
The brush head I4 may be of any construction or material, for example, plastic with longitudinally extending wires 30 of spring steel running through each row of bristles (see Figure 1). These wires fbeing of spring steel, are adapted to return the bristles to a flat or concave position, as shown in Figure 2, or from the convexV position of the bristles, as shown in Figure 3, when the finger piece 22 is pulled from the small notchesacross the ends of the arms 25 and 2tA against the resistance of the wires 3S and turned approximately degrees until it may be engaged in the large V-notch.
As the device is illustrated, the actuating shaft II is made flat the greater portion of its length, and round only at the outer end 3| to provide for the swivelling action of the finger piece 22 3 for its engagement with the respective holding notches.
Thus, there is provided a novel tooth brush having a renewable bristle assembly i4 of convertible shape, which is readily detachable as a separate unit from its mounting in the framelike head portion I2, which bristle assembly, when removed from the head, leaves an oblong aperture therein to facilitate washing out colleoted matter from the head portion. Also, such renewable bristle assemblies may be made of different forms and sizes so as to provide any other desired shapes for washing the teeth than heretofore mentioned. i
Without further description, it is thought that the features and advantages of the invention will be readily apparent to those skilled in the art, and it will of course be understood that changes in the form, proportion and minor details of construction may be resorted to, without departing from the spirit of the invention and scope of the appended claims.
1. A tooth brush including a hollow handle having a recessed head portion with a flanged over end, a flexible and resilient brush head assembly detachably pivoted in said head at one end, a reciprocatable actuator member extending through said handle and a hook member carried by said actuator member engageable over the free end of said brush assembly opposite to said pivoted end, whereby the brush head may be exed upwardly from the recessed head portion to change the configuration of said brush assembly upon reciprocation of said actuator in the handle.
2. A tooth brush comprising a hollow handle, a recessed head portion associated with one end of the handle, said head having side and end walls, a pin mounted between said side walls, means extending from beyond the other end of said handle through one of said end walls to the opposite end wall, a resilient and flexible bristle assembly adapted to fit between said walls pivoted at one end to said pin, means carried by said rst means engaged with the free end of said bristle assembly, and means rotatably mounted on the end of said rst means beyond the said handle end adapted to engage in notches arranged in this end of said handle and at varying distances to thereby move said second named means with said free end of the bristle assembly toward and away from its pivoted end.
3. A tooth brush comprising a hollow handle, a recessed head portion associated with one end of the handle, said head having side and end walls, a pin mounted between said side walls, means extending from beyond the other end of said handle through one of said end Walls to the opposite end wall, a resilient and flexible bristle assembly adapted to fit between said walls pivoted at one end t said pin, a hook carried by said means engaged over the free end of said bristle assembly, and a finger piece rotatably mounted on the end of said means beyond the said end of the handle, said handle end having notches positioned angularly with respect to each other and of different longitudinal depths adapt- I the free end of said bristle assembly, the free end of said handle being provided with a plurality 'of notches of different longitudinal depths from the end of the handle, and a finger -piece having tapered seat portions rotatably mounted on the end Yof said longitudinally movable means adapted to intert with said notches to the different depths of each notch to regulate the shape of the said bristle assembly upon displacement of said longitudinally movable means.
5. A tooth brush comprising a handle having a head portion adapted to contain a bristle assembly, said head having a countersunk bottom with an oblong slot dened therein, side walls on each side of the said slot, and end wall at the inner end of said head, a turned over flange on the outer end of said head, a pin mounted between said side walls adjacent the inner end of said head portion, a shaft reciprocable within said handle for lengthwise movement thereof,
said shaft having a rounded portion extending from beyond the end of the handle and a relatively at portion integral therewith extending the length of said handle and projecting from the said end wall at the inner end of said head portion over the said slot, and under said flange at the outer end of said head, said shaft having a hooked-end slidable under said flange, and a bristle assembly having a flexible resilient backing pivoted at one end around said pin and engaged at the other end by said hooked-end, and a finger -piece universally mounted on the end of said rounded portion of the shaft adapted to engage with means at the end of the handle to thereby lock the shaft in different lengthwise adjusted positions to thereby cause the hookedend to ex the said backing upwardly from the head portion, and change the shape of said bristles to a configuration diierent from an unflexed condition of the said backing.
MAURICE J. WALKER.
REFERENCES CITED The following references are of record in the file of this patent: