US2829413A

US2829413A - Lockable safety pin

Info

Publication number: US2829413A
Application number: US495218A
Authority: US
Inventors: Paul R Hayes
Original assignee: Individual
Current assignee: Individual
Priority date: 1955-03-18
Filing date: 1955-03-18
Publication date: 1958-04-08
Anticipated expiration: 1975-04-08

Description

A ril 8, 1958 P. R. HAYES LOCKABLE SAFETY PIN Filed March 18, 1955 PAUL R. fi/Avss INVENTOR.,

This invention relates to a lockable safety pin and,

more particularly, to improvements in a latch for safety r pins of the type in which a U-shaped shield has one arm secured to the base bar of the pin and the other arm is channeled to receive and retain the pointed pin arm wherein latch means is interposable within the channel to block removal or prevent dislodgment pin.

The principal objects of my invention include the provision of a lockable safety pin in which the movement of the pointed pin into and out of the shield may be of the pointed accomplished with facility, but in which the pointed pin may be locked simply and easily to effectively prevent j accidental dislodgment; to provide a latch for a safety pin which is simple and easy to construct to the end that the cost of manufacture is kept low and within the ordi} nary requirements of economies, but which is extremely g effective to accomplish latching or locking of the pointed pin end; and, further, to provide an improved latch which 'fpositively locks the pointed pin in the fastened position but which may be manually operated with facility by a person having reasonable finger dexterity, whilepreclud ing, either accidentally or intentionally, unlatching by an infant or one lacking reasonable finger dexterity.

These and other 'objects of the invention as will be more apparent during the course of the following specification are accomplished through the provision, in a 1,

conventional safety pin, of a latch arm disposed in the throat of the usual U-shaped shield. The latch is adapted for swinging or pivotal movement from a non-latching position to a latching position in such a manner that the pointed pin end may be readily disposed in or removed from a channeled arm of the U-shaped shield. The. latch device, in the latching position, effectively precludes and prevents accidental or intentional removal of pointed pin from the channel portion of the U-shaped',

shield.

In the drawings in which is shown a preferred form,

of my invention,

Figure l is a view in side elevation of my improved-1 lockable safety pin with the latch means shown in the,

closed position;

Figure 2 is an enlarged vertical section taken on line 22 of Figure 1; and

Figure 3 is an enlarged view in side elevation of the latch in locked position in relation to the safety pin shieldi The safety pin shown in the enclosed drawings is conventional in many respects and includes the base bar 1 and the pointed pin arm 2 joined together by con ventional helical spring 12 at common ends of the bar and arm, respectively. A U-shaped shield 3 is provided at the other end of the bar 1 and of arm 2. One arm of the U-shaped shield is secured to base bar 1 of the pin by crimping or other fastening means so that the shield is firmly held against longitudinal movement along the base bar as well as rotative movement therearound. The opposite arm of the U-shaped shield'Suis internally channeled and the mouth 10 of the channel is open toward U d Pet 2,829,413 Patented Apr 8, 19158 the secured arm of the shield 3 It isin the channel 13, accessible through mouth 10, that the pointedend of pin arm 2 is disposed when the safetypinis closed. t

Ajfinger 8 extends from the secured arm of the U- shaped shield, in a medial plane, toward'mouth 10 of the channel arm 13 of the shield. Amongother thing, finger 8 functions as a guide element during the action of moving the pin arm 2 into place into the shield and also during its removal therefrom. A stop or shoulder 5 is laterally disposed at the base of said finger, being partially formed by the crimping of the secured arm around base bar 1. Since the finger 8 is medially located, it is customary and preferable that there be a stop or shoulder laterally disposed at each side of the base of the finger, as is shown in Figure 2.

A bifurcated latch arm 4 is pivotally secured astraddle finger 8 by a pivot pin 9.

The latch arm 4 swings from the nonlatching position A, shown in dotted line in Figure 3, to the perpendicular or upright position indicated in solid lines. In this latter or latching position the head end of latch arm 4 effectively blocks the mouth 10 of channel arm 13 of shield 3, locking the pin arm 2 into the shield against intentional or accidental dislodgment so long as the latch is disposed upright. The latch arm is an inverted bifurcated member, the legs of which straddle the finger 8, and the head of which is broad enough to choke or substantially fill mouth 10. The free ends of the legs of the latch arm include the curved surface 6 and the stop 7..

Stop 7 is so arranged on the latch arm that it precludes movement of the latch arm beyond the perpendicular latching position as the latch moves from the nonlatching position A. This is accomplished by locating stop 7 so that it comes into abutting relation with a shoulder 5. While this may be accomplished on but a single side of the safety pin, it is preferable that a pair of horns 7 be provided to cooperate with a pair of stop shoulders 5.

It is preferable that the non-latching position of the latch 4 be such that it lies generally alongside of the base bar 1 and extending outwardly of the open portion of the U-shaped shield 3 or toward spring 12. This is 1 desirable primarily to preclude interference with the insertion or removal of the pin arm 2 from the shield. Ordinarily, as the pin arm 2 is swung toward the base arm 1,

" it is also laterally rotated or swung so that its pointed end passes along the outside of the walls of channel 13 until it comes in contact with the exposed end of the finger 8. Thereupon a release of pressure against the 'springiness' or resilience of arm 2 results in its disposi- 1 tion in the mouth 10 of shield 3. In accomplishing this,

finger 8 functions as a guiding element. Thereafter the latch 4 is swung to the perpendicular position wherein the stop and horn means co-operate and the upper end of the latch arm blocks the mouth 10 and locks the pin 2 in place. When the pin 2 is impaled in cloth, any move ment of the pin relative the impaled portion of cloth tends to close or press on the latch, thus precludingaccidental opening of the latch.

The reverse movement of the latching arm 4 will permit ready removal of the safety pin point.

Having thus described my invention, I claim:

A lock for a safety pin of the type having an open U-shaped shield in which one shield arm is secured to the base bar of the pin and the other arm is channeled to receive and retain the pivoted pin arm in the closed position, comprising: a finger medially located on the secured arm of said U-shaped shield and extending toward the channel of said other shield arm, said secured arm having a stop shoulder laterally disposed at each side of the base of said finger, a bifurcated latch arm having its legs astraddle and pivotally secured to said finger to swing from a non-latching position aligned with and adjacent said base bar to a latching position substantially perpendicnlar thereto, said latch arm being of a length to extend into said channel and having a broad end blocking the mouth thereof toretain the pointed pin arm in the channel, and a stop carried by each leg of said latch arm adjacentits pivot, said stops being shaped to cooperate with the stop shoulders and to prevent movement of the latch arm beyond the perpendicular latching position in its movement from the non-latching position.

in the file "of this patent