US1589576A - Reflecting instrument - Google Patents

Description

June 22,1926. 1,589,576.

J. M; THOMPSON REFLECTING INSTRUMENT Filed June 29, 1925.

M ATTORNEY.

' light source.

Patented June 22, 1926.

JAMES M. THOMPSON, OF KANSAS CI Y, MISSOURI.

nnrrncrrn'c INSTRUMENT.

Application filed June 29, 1925. Serial No. 40,354.

My invention relates to improvements in reflecting instruments. It is particularly well adapted for use in a dental hand niirrori I One of the objects of my invention is to provide a novel instrumentof the kind described which will project light from a light source in the instrument to points desired.

while at the same time shielding the eye of the observer from the direct rays from the A further object of my invention is to provide a novel instrument of the kind described, which is simple, cheap, compact, convenient, not liable to get out of order, which is durable, and with which the desired light may be easily projected to points desired. v

The further object of my invention is to provide a novel construction whicl'rmay be readily partly disassembled for access to its interior.

The novel features of my invention are hereinafter fully described and claimed.

In the accompanying drawing which illustrates the preferred embodiment of my invention as applied to a dental hand mirror,

Fig. 1 is a perspective view of my improved reflecting instrument.

Fig. 2 is an enlarged longitudinal central sectional view of the same.

Fig. 3 is a cross section, enlarged, on the line 8-3 of Fig. 1.

Fig. 4 is a cross section on the line 4:& of Fig. 2.

Fig. 5 is a rear view of the mirror.

Similar reference characters designate similar parts in the ditterent views.

The instrument has a casing comprising a circular body 1 having an externally threaded open end on whichis removably fitted a threaded ring 2. v

In the body 1 and held thereby releasabiy by the ring 2 is a. mirror comprising a glass plate 3 having asilvered reflecting inner side 4, and provided with an edge, 5, preferably annular and outwardly flaring and beveled.

The body 1 is provided with a handle 6,

The inner surface of the body 1 at 10 is reflecting and outwardly flaring, and disposed so to reflect light from the lamp J against the beveled edge 5, the. latter being disposed so as to retract the projected light outwardly, preferably, through the glass plate 3. the rays of light converging, preferably, from the outer surface of the glass plate 3.

The handle 6 has at its outer end a revoluhis finger piece 11 .fitted'in the handle ber 13 with which the outer end of the bat tery-ceil 7 is provided. Thelamp 9 has one terminal'contacting with the body 1. The latter and the handle 6 and finger piece 11 are also conductive, the casing of the cell 7 being nonconductive' By, turning the finger piece to and from a position in which the contact member 12 will strike the contact member 13, the circuit will be closed and opened, so as to turn on and off the current from the lamp 9.

lVhen the finger piece is turned to the closed position, the light from the lamp 9 will strike and be reflected by the reflecting surfaces 10 against the beveled edge From there the light will be refracted inwardly and outwardly, as shown in Fig. 3,

so as to make a halo of light, when an annular beveled edge is provided. This light will be projected at desired points andreflected therefrom into the mirror in which the operator will see the surface thus-re flected.

After the device has been used, the finger piece 11 is turned to the position, shown in Figs. 2 and i, thus breaking the circuit in which the lamp 9 and battery cell? are located.

For access to the lamp to replace the same, or to clean the interior of the body 1, the ring 2 is removed and with it the glass plate 3.

By withdrawing the finger piece from the handle 6, the battery cell may be inserted or removed.

With the use of the instrument, the direct raysof the lamp 9 do not enter the eyes of the operator, and the lamp is carried in a convenient mamier.

I do not limit my invention to the structure shown and described, as many modificat ons, Within the scope o the appended light against the reflecting surface of the casing, the latter being disposed so as to reflect light from said lamp against said beveled edge and through said glass plate therefrom.

2. A reflecting instrument comprising a casing, 'a'mirror in said-casing comprising a glass plate having an outwardly flaring beveled edge, and a silveredreflectinginner side, and means disposed at the rear of said mirror by which light maybe projected against said "flaring beveled ed e and forwardly through said glass plate therefJOm.

3. A reflecting instrument comprising a casing having a handle, a glass plate in'said casing having an outwardly flaring retracting edge and a silvered beveled inner side, an electric lamp in said casing at the rear of said glass plate, said'casing having means therein for reflecting light from said lamp against said beveled edge and therefrom through said glass plate, and ineans in said handle and casing for supplying said lamp with current.

4. A reflecting "instrument comprising a casing having a handle and an inner reflecting surface, a. glass plate in said casing hav-- ing-a beveled outwardly flaring edge and a srlvered inner reflecting side, an electric lamp in 'sald casing at the rear of said glass a beveled edge and a silvered reflecting inner side, and means 1n said casing for proecting light against said ebeveled edge, the

latter being disposed so as to retract the projected light through said glass plate.

6. A reflecting instrument comprising a casing having a body and a ring removably fitted on the body, a glass plate held against said body by said ring and having an annular outwardly flaring beveled edge and a reflecting inner s1de,"a lamp in said body at the rear of said glass plate, and

means in said body for reflecting light projected from said lamp against said beveled edge, the latter being disposed so as to re tract the projected light through said glass plate.

7. A reflecting instrument comprising a transparent plate having at its rear side an opaque coating having a front reflecting surface, the plate having a beveled edge which flares forwardly outwardly, light proiectin'g means at the rear of said coating, and means for reflecting light projected from said projecting means against said beveled edge from which the light so refracted passes through said transparent plate.

In testimony whereof I have signed 'my name to this specification.

JAMES M. THOMPSON.

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