US1982734A - Trick pencil - Google Patents

Description

Dec. 4, 1:934. s. A. GRAVES 1,982,734

TRICK PENCIL Filed March l, 1954 Patented Dec. 4, 1934 1,982,734 TRICK PENCIL Samuel Albert Graves, Worcester, Mass. i

Application lMarch 1,

4 Claims.

This invention relates to a trick pencil, and it consists in the constructions, arrangements and combinations herein described and claimed.

It is an object vof the invention to provide a detonating device in the form of a pencil, which When used as an ordinary writing implement will cause a detonation, affording amusement to onlookers, and surprise to the user.

It is also an object ofthe invention to provide a device of the above nature which simulates the ordinary magazine pencil, one which embodies `few parts in its assembly, and one which may be readily loaded and restored to its normal operative condition.

Additional objects, advantages and features ci invention will be apparent from the following description and accompanying drawing, wherein Figure 1 is a side elevation of the device constructed in accordance with -my invention.

Figure 2 is a longitudinal sectional view on the line 2 2 of Figure 1.

Figure 3 is Aan enlarged sectional View on the line 3 3 of Figure 2.

Figure 4 is a cross section on the line 4 4 of Figure 2. V

Figure 5 is a cross section on the line 5 5 of Figure 2.

Figure 6 is a cross section on the line 6 6 of Figure 2.

Figure 7 is an elevational view, partly in section, illustrating a means for resetting the firing pin.

Figure 8 is a cross section Figure 7.

In carrying out the invention, I make use of a barrel 10, similar in outward appearance to the usual barrel of a magazine pencil, and including a longitudinal bore 11, extending from the tip 12 to a position approximately midway of the barrel, where the barrel is provided With a bore 13 of considerably greater diameter than the bore 11 but is concentric therewith. The bore 13 extends to the inner end 14 of the barrel, as clearly shown in Figure 3. The inner end of the barrel 10 is reduced in diameter as at 15, and in the reduced portion 15 aligned apertures 16 and 17 are provided. The apertures 17 have threaded therethrough a strand or cord 18, which also passes through an aperture 19 formed in a cylindrically shaped ring pin 20. The pin 20 is slidably received within the bore 13 and has a slot 21 formed in the end disposed Within the bore, and extends a short distance beyond the strand 18, Where it will function as an anvil for on the line 8 8 of severing of the strand, as will be explained. The

1934, Serial No. 713,565

ring pin 20 has an aperture 22 adapted to align with the apertures 1,6, and it will be noted from a consideration of Figures 7 and :8 that when it is desired `to ret-hread a strand 18 through the apertures 17 19, it is merely necessary to insert a pin 23 through the apertures 16-22, thereby aligning the apertures 17e-19 4to receive .the strand. The strand 18 is preferably of-a length to. extend .downwardly upon each side of the reduced portion l5 a short distance, and the strand 18 will be stretched `taut `across the slot 2l by engagement of a cylindrical barrel 424upon the reduced portion l5, impingng the ends of the strand between the barrel `24 and the reduced portion 15.

The barrel 24 is provided With a longitudinal bore 25 through which the pin 20 is slidable upon severing ofthe strand.` The barrel 24@` may be provided with screw threads as at 26 upon which there is engaged Aa detonating cap anvil 27. 'The anvil in the present` instance is illustrated to simulate the eraser end yof va magazine pencil, but around the cap chamber 28 there are provided a series of apertures 29 permitting escape of gases, occurring incident to the explosion of the cap illustrated at 30.

A rod 31 simulating the lead of a pencil is slidably arranged within ther bore 11, the inner end thereof terminating in a cutting edge 32, which in set position of the pencil, as seen in Figure 2, bears upon the strand 18. A helical spring 23 is housed within the bore 13 seating at 34, on the barrel l0, the other end of the spring bearing against the ringpin 20.

In use, when pressure is exerted upon the rod 31, such as would be involved in the use of an ordinary pencil, the rod 31 would slide upwardly into the pencil causing the cutting edge 32 to sever the strand 18. Should the strand 18 for any reason not be sufi'iciently taut to permit proper functioning of the blade, the anvil portion of the slot will provide a proper base for the cutting edge to insure separation of the strand. As soon as the strand has been cut, the spring 33 which has been under tension will project the pin 20 outwardly through the bore 2,5 into engagement with the cap 30, causing a detonation of the cap, with thedesired surprising results to the user of the pencil. The gases developed by the explosion of the cap escape by way of the apertures 29.

In resetting the pencil, the anvil cap 27 is removed, anew cap positioned in the chamber 28 and then replaced upon the barrel 24. The barrel 24 having been removed from the barrel 2 10, the iiring" pin 2 is forced downwardly into the bore 11 until the apertures 16-22 are aligned, the pin 23 is then inserted through these apertures. As seen in Figure 2, the spring 33 will be compressed and the cutting edge 32 will be positioned below the apertures 17-19. The strand 18 is then threaded through the apertures 17-19, the ends being held against the sides of the barrel and the pin 23 withdrawn. The strand 18 will hold the pin 20 against movement and the spring compressed upon engagement of the,

barrel 24 upon the reduced portion of the barrel 10, since the ends of the strand 18 will be securely wedged between the barrel 24 and the reduced portion 15.

It has been found in practice .that dental floss is well suited for use as the strand 18, and if desired, the rod 31 may actually-be a Aportion of lead, to which a cutting edge may be secured, thereby enhancing the value of the pencil.

While I have shown and described a preferred embodiment of the invention I am aware that various modications may be made, and I reserve as my own all such changes as fairly fall within the scope of the appended claims.

I claim:

1. A detonating device comprising a body having a bore therethrough, a rod slidable within the bore, said rod having a cutting edge at one end thereof, the other end thereof projecting beyond said'body, a firing pin within the bore, a detonating cap chamber aligned with the firing pin, means for projecting the ring pin, and a severable member secured to the body and kfiring pin and extended across the path of the cutting edge. i

2. A detonating device comprising a body, a rod slidable therein and having one end projecting beyond the body, a iiringpin slidable within the body, means within the body for exerting pressure upon the pin in one direction of sliding movement, means for holding the pin against sliding movements, means carried by the rod fori releasing said holding means, and a cap chamber carried by said body in alignment with the ring pm.

3. A trick pencil comprising a cylindrical body having a longitudinal bore, a rod slidable within the bore and projecting beyond one end thereof, a ring pin arranged within the bore, a severable strand connected between the body and the pin for holding the pin against sliding movement in the bore, a helical spring within the bore and tending to forcibly project the pin, a cap chamber fixed to the body in advance of the firing pin, and said rod having a cutting edge for severing the strand upon inward movement of the rod for` release of the firing pin.

4. A trick pencil comprising a cylindrical body having a longitudinal bore stopping intermediate the length of the body, a rod slidable within the bore and projecting beyond one end thereof, a second bore within the body forming a continuation of the rst named bore but or greater diameter, a helical spring seated within the second bore, a iiring pin arranged within the second bore, one end thereof having seated engagement with the spring, said pin having a pair of apertures for registry with apertures formed in the body, a strand threaded through the aligned apertures of the pin and body, the ends of the strand being disposed upon opposite sides of the body, a barrel 105 engaged over the body, and the ends of the strands, the firing pin further having a slot at the end in Contact with thel spring, the slot stopping slightly beyond the strand extended there across, a cap chamber carried by the barrel and 110 aligned with the firing pin, said chamber having apertures therein for escape of gases, and said rod having a cutting edge for severing the strand upon inward movement of the rod by pressure upon the projecting end thereof.

SAMUEL ALBERT GRAVES.

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