US 1623532 A
Description (OCR text may contain errors)
April 5,1927, 1,623,532
A. DUDAS ET AL SAFETY PIN Filed Au 28. 192$ Patented Apr. 5, 1927.
1 r UNITEDWSTAT 'Annnnwnnnnsnnn AiiBERT P. wAsIL, or HOMESTEAD, I ENNSYLVAN LAi SAFETY m1.
Application filed Ling-11st 28, 1928. Serial No. l'32,-296.
This invention relates to safety-pins and more in particular to improvements in the construction and manufacture of safety-pins of'th'e so-called Clinton-type.
provide a safety-pin which prevents the pinching of cloth between the turns of the spring-loop of said pin. Another object of this invention is provide a safety-pin which is composedkof a minimum number of parts and which is very simple in construction. Still a further object is to provide a safety-pin which is neat in appearance, strong and durable and which can be easily manufactured on wire twisting machines of the type used'for making such pins. Additional features and advantages of this ina separate metal guard at the loop end to.
prevent the pinching of cloth between the turns of the spring-loop.
As is well known, a safety-pin of the Clinton type is made of a piece of suitable wire and comprises a bridge-bar 1 which is bent at one end substantially one and one half turn to form the spring-loop 2 which terminates with a pointed wire extension forming the pin-bar 3. At the opposite end of the spring-loop the bridge-bar is also given an upward bend 4: upon which a substantially U-shaped safety-pin cap 5, of usual design,'is clamped; the upper part of this clamp being adapted to receive the pointed end of the pin-bar when the safety pin is closed.
A bad feature of a safety-pin constructed as stated above is that the cloth to which the pin is applied isliable to become pinched betweenthe turns of the spring-loop, thereby making the extraction of the pin difficult and often causing the tearing of said cloth. To obviate this disadvantageous feature, a Clinton type pin is often provided with a The primary objectof this invention is to sheet metal guard 6 of semi-annularshape which is pressed on the spring-loop randi holds the turns thereof close together, thus preventing the pinching of the cloth. The application of such a guardgreatly increases the cost of manufacture of the safety-pin not only on account of the additional -expense for making this guard in specialand costly punching and fiorming presses, but also-because oi? the fact that the-application of the guard to a safety-pin requires a special operation which, up to the present time must be performed on a special machine, thus requiring additional handling of the safetypin. Another disadvantage lies inthe fact that the resiliency of the pin-bar is greatly reduced because of the fact that the turns of the spring-loop are hemmed in their movements by said guard; this may cause, after moderate use, the breaking of the pin-bar especially at the point where it enters the guard.
In the safety-pin of our invention the pinching of the cloth between the turns of the spring-loop is prevented by means of a guard which is formed integrally with the safety-pin by suitably bending the wire-.
stock from which the pin is made in a single set-up in an automatic wire twisting machine.
Reference being ha-d especially to Figs. 1
to 3, it will be noted that the combined spring-loop and guard is formed by first forming at one end of'the bridge-bar 1 an upward, semiannular bend 7, preferably greater than 180 degrees, then forming a leg 8 which in turn is bent downward to produce a bight 9 and another leg 10 which is inclined toward the bridge-bar l and which is extended to produce a second upward bend 11 substantially parallel with and of equal size as the first mentioned loop-bend 7. The last bend 11 terminates with the substantially straight and tangential pin-bar which engages the b ight 9. The depth of the latter is such as to allow the required outward flaring movement of said pin-bar (as indicated in dot and dash lines in Figure 1) and the width of said bight is just great enough to guide the pin-bar and permit of the free movement thereof, so that cloth cannot be pinched between the pin-bar and the legs of the bight. In actual practice. we prefer to bend the legs 8 and 10 in a common plane substantially at right angles to the longitudinal axis of the safety-pin, this axis being assumed to pass through the center of the spring-loop and the center of the cap 5.
From the above description it will be apparent that We have devised a safety-pin which performs the desired object of not pinching the cloth, which in no way reduces the springiness of the pin-bar and which can be manufactured on automatic wgire twisting machines built especially for making safety-pins. 7
As will be understood, as suggested here in, there may be slight changes made in the construction and arrangement of the details of our invention without departing from the field and scope of the same, and we intend to include all such variations, as fall within the scope of the appended claim, in this application in which the preferred form only of our invention has been dis- 20 closed.
We claim 2- In a safety-pin, a bridge-bar; said bridgebar having at one end a substantially semiannular bend, a return-bend formed at the end of said first bend and having one end extended to form another bend paralleling said semi-annular bend and having a tangential and substantially straight extension adapted to form the pin-bar of said safety- ANDREW DUDAS. ALBERT P. W'ASIL.