US1865711A - Ophthalmic mounting - Google Patents

Description

July 5, 1932. E. M. SPLAINE OPHTHALMIC MOUNTING Filed- Sept 24 1929 'dwardlllfi him. if 18-I. INVNTOR A TTORNE Y fPaitented July 5, 1-932 FF ICE EDWARD M. SPLAINE, or SOUTHBRIDGE, rrAs'sAoHUs-urrs', ASSIGNOR ro AMERICAN OPTICAL COMPANY, or SOUTHBBIDGE, MASSACHUSETTS, A VOLUNTARY ASSOCIA- TIOIN' OF MASSACHUSETTS :OIPH'VTHALMIG MOUNTING Application filed September 24, 1929. Serial No. 394,773.

This invention relates to improvements in 'o'phthalmic mountings and has particular reference to an improved spring connection for said mountings.

The principal object of the invention is to provide an improved connection for a detachable spring bridge for an. ophthalmic mount- 'ing.

Another object of the invention is to provide a detachable spring which may be quickly and rigidly secured to an ophthalmic mounting and which will not become loose during its continued use.

Another object is to simplify the bridge connection inophthalmic mountings, particularly' mountings requiring pivoted bridge springs. i

Another object of the invention is to provide improved means for taking up loose play and wear in spring bridge connections for ophthalmic mountings, particularly in interchangeable spring bridge connections.

Other objects and advantages of the invention will be apparent from the following description taken in connection with the accompanying drawing, and it will be understood that many changes may be made in the details of construction and arrangement of parts without departing from the spirit of the invention as'expressed in the accompanying claims. I, therefore, do not wish to belimited-to the exact details shown and .de-'

scribed as the preferred form only has bee shown by way of illustration.

Referring to the drawing: Fig. I is a front elevation of an ophthalmic mounting embodying the invention.

Fig. II shows the mounting in folded or closed position.

Fig. III is a fragmentary enlarged view of the spring connection shown partly in cross section.

Fig. IV is a fragmentary plan view of'a portion of the spring connection shown in Fig. III. p

Fig. V is a cross section on line VV of Fig. III.

' Spring bridges are adaptedto be used with an ophthalmic mounting commonly known as the folding -Oxford or other generally similar eyeglasses. The pivoted bridge sprmg of such mountings usually comprises spring pivotal connections at each end of the bridge spring of precious metal and by.

detachably connecting the bridge spring with its pivot connection repairs are greatly facilitated in case of the breakage of the spring,

thereby reducing the cost of parts and repalrs. Several attempts have been made to accomplish this result, many of which have been impractical because of the continual wear of parts during their use, which soon resulted in a loose, wabbly connection, and

others of which were impractical because too justable means for eliminating looseness and to compensate for wear of parts. The device is simple in construction and is easily and quickly interchanged.

Referring more particularly to the drawing, the illustrative embodiment of the invention comprises the lenses 1 mounted in the lens frames 2 connected by the bridge spring 3. Nose guards 4, as indicated, may be mounted on suitable posts secured to the lens frames 2. The bridge spring 3 is provided at each end with a spring pivot connection 5 to-allow the mounting to be folded, as illustrated in Fig. II. Under these conditions a notch 6 may be made in a suitable enlargement 7 on one of the lens frames 2 to be engaged by a spring catch or other means 23 the bridge spring 3 comprise a pivot casi [1g 9 which may substantially enclose the pivot knuckle 10 formed on the lens frame 2. The casing 9 is pivotally secured to the knuckle 10 by the screw or like means 11. The said casing is provided with a grooved. portion 12 adapted to receive the perforated end of the spring 3, and is provided adjacent one end thereof with a tapered portion 13 adapted to engage a lug 14 carried by the spring 3. The lug 14 is provided with a shouldered head 15 which has a tapered undercut portion 16 with which the tapered portion 13 of the casing 9 interlocks. The tapered portion 13 and lug 14 are held in constant engagement with each other by a screw or like means 17 which secures the spring 3 to the casing. The lug 1 1 is secured to the spring 3 by heading over the portion 18 which extends through an opening formed in the spring.

The lens frames 2 are split at19 topermit the removal and replacement of lenses. A screw or like meansiQO is ada-ptedito close the splitv and hold the lensin the frame.

By reference toFig. IIIyit-will be seen that a slight clearance 21 is formed between casing 9 and the end of the spring 3: adjacent the screw connection 17 to: al'lowflthelugle and the end 13 of the casing 9 tobe rigidly drawn together and also to take upanywear or loose play at that connection. It will .be seen that the spring 3-may be quickly interchanged by simply removing the screw 17 and sliding the lug let free of the tapered end 13. To secure the spring 3 in position the-screw 17 1S tightened until the parts a-re drawnrigidly together. The tapered: end 13 of the casing 9 and the tapered lug 14c providea simpleinterchangeable connection wherein loose play and wear of parts may be quickly removed and compensated for bysimplyrtightening the screw 17.

From the foregoingdescription-itwill be seen that I have provided simple,-economical and efiicacious meansof forming :an interchangeable bridge-spring for an ophthalmic mountingwherein the springmay be quickly and rigidly secured to themounting.

Having described my invention, I claim 1. An interchangeable spring bridge for an ophthalmic mounting comprising a spring member having perforations adjacent its ends and intermediate its ends-andlugs inthe intermediate perforations having tapered undercut portions.

2. In a device of the character described in combination with the lens holding means of an ophthalmic mounting,-a projecting member on the lens holding means having atapered portion adjacent its free end, means:for connecting the lens holding means together,--alug on the connecting means having a tapered under cut portion in engagement withthe'tapered end of the projec-ting 'member and means for securingtthe-connecting means'to the proj ecting member to hold the tapered under cut lug ineng-agement witlrthe tapered end of said projecting member.

'3. In a device of the character described-in combination withithe lens-holding means of anophthalmicmounting, r a projecting member pivoted to the lens holding-means and having a tapered notched portion adjacent its free end, resilient means for connecting the lens holding means together, a lug on the resilient connecting means having a tapered under cut portion in engagement with the tapered notched end of the projecting member and means for securing the connecting means to the projecting member to hold the tapered under cut lugin engagement with the tapered notched end of "saidprojecting member.

4. In. a device of the character described in combination with the lens holding means of an ophthalmic-mounting, a member pivotally connected adjacent one of its ends to the lens holding means and having-a grooved extension terminating in atapered portion adjacent the end opposite thepivot, a spring member, a lug on the spring member having a tapered under cut portion engaging the tapered end of the .grooved'extension,said spring member having 'a portion thereofdying within the grooved extension and means for securing the portion ofthe sprin'g'within the groove and-simultaneously securingthe tapered end of the grooved-extension and tapered under cut lug in interlocking-engagement with each other.

5. In a device of the character described in combination with the lens holding means of an ophthalmic mounting, a member pivotally connected adjacent one of its ends to the lens holding means and havinga grooved extension terminating in a notched portion adjacent the end opposite the: pivot,*a spring member, a lug on'thespring member-engaging the notched end of the grooved: extension,

said spring member having 'a portion thereof. lying within the grooved extension and means for securing the portion of the spring within the groove and simultaneously 'securing the lug within the notchedrend.

6. In a device of the character described in combination with the lens'h'ol'd-ing means "of an ophthalmic mounting, a spring anchor member connected to the lens holding means and'having a grooved extension terminating in a tapered portion adjacent one endthereof and having an enlarged angle'portion adjacent the pivot connection,'said 'angledpor- 'tion having a threaded recess therein, a

spring in the groove and hold the tapered lug and tapered end in engagement with each other.

7. In a device of the character described in combination with the lens holding means of an ophthalmic mounting, a spring anchor member pivotally connected to the lens holding means and having a grooved extension terminating in a notched portion adjacent one end thereof and having an enlarged angled portion adjacent the pivot connection, said angled portion having a threaded recess therein, a spring member having a portion adjacent its end lying Within the grooved extension and having an angled perforated end portion overlying the threaded recess in the angled portion of the anchor member, a lug on the spring member in engagement With the notched end when the spring is in position Within the groove and a screw member extending Within the perforated end of the spring member and in the threaded recess to secure the end of the spring in the groove and hold the lug in engagement with the notched end of the grooved extension.

EDWARD M. SPLAINE.

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