|Numéro de publication||USRE41259 E1|
|Type de publication||Octroi|
|Numéro de demande||US 11/147,469|
|Date de publication||27 avr. 2010|
|Date de dépôt||14 avr. 1998|
|Date de priorité||12 juil. 1996|
|État de paiement des frais||Payé|
|Autre référence de publication||EP1071546A1, EP1071546A4, EP1071546B1, US5737841, US6122829, US6438848, US6574869, WO1999052687A1|
|Numéro de publication||11147469, 147469, PCT/1998/7509, PCT/US/1998/007509, PCT/US/1998/07509, PCT/US/98/007509, PCT/US/98/07509, PCT/US1998/007509, PCT/US1998/07509, PCT/US1998007509, PCT/US199807509, PCT/US98/007509, PCT/US98/07509, PCT/US98007509, PCT/US9807509, US RE41259 E1, US RE41259E1, US-E1-RE41259, USRE41259 E1, USRE41259E1|
|Inventeurs||William J. McHenry, Jason L. Williams|
|Cessionnaire d'origine||Mentor Group Llc|
|Exporter la citation||BiBTeX, EndNote, RefMan|
|Citations de brevets (50), Référencé par (21), Classifications (5), Événements juridiques (2)|
|Liens externes: USPTO, Cession USPTO, Espacenet|
This application is a 371 of PCT/US98/07509 filed Apr. 14, 1998 which is a continuation-in-part of Ser. No. 08/679,122 Jul. 12, 1996 now U.S. Pat. No. 5,737,841.
This invention relates generally to folding tools, and more particularly to a folding tool including blades or tools capable of being locked in an open position.
Folding knives and tools suitable for many purposes are well known in the art. For example, U.S. Pat. No. 1,030,058 to Doles, U.S. Pat. No. 1,189,005 to Seely, U.S. Pat. No. 2,188,762 to Schrade, U.S. Pat. No. 3,868,774 to Miori, U.S. Pat. No. 4,233,737 to Peohlmann, U.S. Pat. No. 4,240,201 to Sawby et al., U.S. Pat. No. 4,274,200 to Coder, U.S. Pat. No. 4,451,982 to Collins, U.S. Pat. No. 4,502,221 to Pittman, U.S. Pat. No. 4,670,984 to Rickard, U.S. Pat. No. 4,837,932 to Elsener, U.S. Pat. No. 4,896,424 to Walker, U.S. Pat. No. 5,060,379 to Neely, U.S. Pat. No. 5,425,175 to Rogers, and U.S. Pat. No. 5,461,786 to Miller are representative of the available prior art.
As disclosed in several of the aforementioned patents, there are many different mechanisms for locking tool blades in an open position. For example, the patents to Sawby et al., Miller and Seely each disclose a variation of a “lock back” mechanism. This construction entails forming a notch on a tang of the blade which is engaged by a lug located on the spine of the knife to lock the blade in an open position. A shortcoming of this type of mechanism is that excessive wear can cause the locking mechanism to fail, thereby rendering the knife unsafe for use.
The patents to Neely and Collins each disclose another type of locking mechanism. As disclosed in these patents, a blade has a tang that is engaged by a member to prevent the blade from rotating from its open position. For example, in Collins, a slidable bolt is biased towards the tang to lock the blade in its open position. A shortcoming with Collins's knife construction is that the bolt is generally parallel with the blade, and the mechanism depends on the spine of the handle for strength. Neely's knife suffers from the same disadvantage as Collins's, and from the fact that the blade may be unlocked inadvertently by pulling the blade axially away from the handle during a normal cutting motion of the knife.
What is needed, then, is a stronger lock mechanism than has previously been available for holding a blade of a folding tool in an open, or extended, position, yet which is capable of being manufactured at a reasonable cost.
The present invention overcomes the above-mentioned shortcomings of the prior art by providing a folding tool comprising an elongate handle defining an elongate groove therein and at least one knife or other tool blade or other tool element pivotally attached to the handle at one end. Each tool blade or element is movable, between a closed position in which it is received within the groove of the handle and an open position in which the blade or tool element is extended away from the handle and exposed. Each tool blade has a working portion that extends away from the handle when in its open position and a tang portion including a locking surface which is located within the groove of the handle when the blade is in its open position. A blade locking pin extends in a direction generally transverse to the length of the handle and blade and has its opposite ends disposed in elongate openings defined in opposite sides of the handle and aligned opposite each other. The blade locking pin is movable with respect to the handle along the elongate openings, between a first position, in which the locking pin engages a locking surface of the tang portion of blade as well as interior surfaces of the elongate openings, to lock the blade in its open position, and a second position in which the pin is spaced away from the locking surface portion of the tang to allow the blade to move from its open position. The blade locking pin is biased toward its first position, but is movable manually to its second position from its first position.
In one embodiment of the invention a locking assembly body is provided to move the locking pin manually from its first position to its second position.
In one embodiment of the invention the blade locking pin is biased toward its first position by a spring housed in a cavity defined within a side wall of the handle.
In one embodiment of the invention a spine portion of the handle is located adjacent the elongate openings in which the ends of the blade locking pin are located, and respective parts of an outer surface of the blade locking pin rest against the locking surface on the tang of the tool blade and a surface of the spine.
In one embodiment the invention provides for such locking of selected one of a plurality of tool blades or elements carried at one end of a handle.
The foregoing and other-objectives, features, and advantages of the invention will be more readily understood upon consideration of the following detailed description of the invention, taken in conjunction with the accompanying drawings.
Referring now to the drawings, and more particularly to
Referring now to
When the handle 12 is assembled, the spine section 20 is disposed between the liners 24, 28 of the side wall sections 16, 18, respectively, and extends along the upper edge margins of the side wall sections, outwardly projecting detents 30 provided on the spine section are received in corresponding bores 32 formed in the liners, to align the side wall sections with each other and the spine section. Suitable fasteners such as screws 34 and 35 are used to hold together the side wall sections 16, 18 and the spine section 20. Preferably, the outer plates 22, 26 of the side wall sections 16, 18, respectively, are fabricated from a reinforced hard synthetic plastics material such as Micarta® (by Westinghouse Electric & Manufacturing Company), although other suitable materials such as metal, other plastics, wood, etc. can also be used. The liners 24, 28 of the side wall sections 16, 18, and the spine section 20, are preferably fabricated from steel or titanium since these components of the handle must be strong enough to bear the forces that might be exerted thereon when locking the blade in its open position.
The side wall sections 16, 18 and the spine section 20 define a blade receiving groove 36 (see
More specifically, the working portion 38 is constructed in a well-known manner and is pivotally attached to the handle by the tang portion 44 so that the lower sharp edge 42 is received within the handle 12. The tang portion 44 is formed integrally with the blade portion 38 and has a semi-circularly-shaped peripheral edge 46, and a circular opening 48 is formed in the tang for attaching the blade 14 to the handle 12. One of the ends of the peripheral edge 46 of the tang portion 44 merges into an outwardly extending first shoulder 50. The other end of the peripheral edge 46 merges into an inwardly extending second shoulder 52. The first and second shoulders 50, 52 are generally perpendicular with the direction of the peripheral edge 46 at their respective junctions; however, it should be observed as in
As shown in
Referring now to
The sliding lock assembly 60 further includes a cylindrical blade locking pin 72 of which one end is attached (e.g., welded) to the body member 62. The pin 72 has a cylindrical outer surface 73, and a central axis that extends in a generally transverse direction with respect to the body member and handle 12. When the folding knife 10 is assembled, the pin 72 extends through aligned elongate openings 74 formed in the liners 24, 28 of the side wall sections 16, 18, respectively, and the free end of the pin 72 extends into a large cavity 76 formed in the inwardly facing surface of plate 26 of side wall member 18. An inwardly facing surface 77 of the spine 20 is preferably aligned with or nearly aligned with the elongate openings 74, as may be seen best in FIG. 7a. As shown in
Turning now in
Additionally, it should be observed that the pin 72 of the sliding lock assembly 60 has a tendency of “wearing in” rather than wearing out, since the more frequently the blade 14 is moved to its open position and locked therein by the pin, the further the pin becomes wedged between the peripheral edge 46 of the tang portion 44, the surfaces defining the elongate openings 74 in the liners 22 and 28, and (depending upon alignment) the inner surface 77 of the spine 20.
A spring 78 is provided for biasing the pin 72 of the sliding lock assembly 60 to its first position. As illustrated in
It should be observed that the peripheral edge 46 of the tang portion 44 defines a cam upon which the pin 72 can ride as the blade 14 is moved between its open and closed positions. Moreover, referring briefly to
Another important feature of the tang portion of the blade 14 is that the shape of the peripheral edge 46 which defines the cam upon which the pin 72 rides can provide an “assist” when opening or closing the blade 14 of the knife 10. More specifically, as illustrated in
Turning now to
Referring now to
The handle 112 includes a transversely extending back portion 126 having an outer margin 144, and a pair of parallel side wall portions 128 and 130 which extend parallel with each other and perpendicular to the back portion 126, thus defining a wide groove 132. The blade pivot shaft 122 is mounted securely and immovably with respect to the side walls 128 and 130, as by having each of its opposite ends 134 riveted or welded into place in a hole 136 defined in a respective one of the side walls. Each of the blades 114, 116 and 118 includes a working portion 138 such as that portion of the screwdriver blade 114 shown in
As with the previously-described knife 10, a pair of similar elongate openings 150 are aligned with each other and extend through the side walls 128 and 130 of the handle 112. The elongate openings 150 are defined in part by flat surfaces 151 located near the back 126 of the handle 112. A blade locking pin 152, having a longitudinal axis 153, extends transversely of the handle 112 through both of the elongate openings 150, with its opposite ends located adjacent the outer sides of the two side walls 128 and 130. A respective retainer 154, 156 such as a rivet head or a small disc-shaped cap mated with the pin 152 by threads, is located on each end of the blade locking pin 152, and both retainers may be gripped conveniently as release buttons by a person using the tool 110, to move the blade locking pin 152 longitudinally, with respect to both the handle 112 and the elongate openings 150 through the side walls 128 and 130, as indicated by the arrow 158. The blade locking pin 152 includes an outer surface 160 parallel with its axis 153. For the sake of simplicity the central portion or body of blade locking pin 152, including the outer surface 160, is in the shape of a circular cylinder, but it will be appreciated that other shapes could also serve so long as the blade locking pin 152 fits snugly but slidably in the elongate openings 150.
The tang 140 of each tool blade 114, 116 and 118 includes a locking surface 162 oriented at a small angle 164 with respect to the interior surfaces 151 defining a part of the elongate openings 150 when the respective tool blade is in its open position. As with the locking mechanism of the folding knife 10 the angle 164 should be between 7 degrees and 14 degrees and is preferably 10 degrees. The locking surface 162 is generally flat and merges into a convex arcuate peripheral edge surface 166 acting as a cam along which the outer surface 160 of blade locking pin 152 can slide during movement of a blade such as the screwdriver 114 between its open position (
On the opposite side of the tang 140 from the locking surface 162 is a closed blade retaining surface 170 which is normally engaged by the outer surface 160 of the blade locking pin 152 when the blade 114 is closed. As a mater of design choice or of production tolerances there may be a very small clearance between the outer surface 160 and the locking surface 162 or retaining surface 170 of either an open blade or a closed blade, allowing some small amount of movement. Each blade 114, 116 and 118 also includes a shoulder 171 located on the tang 140, opposite the stop 142, to rest against the inner surface of the back 126 of the handle to establish the proper closed position of the blade within the groove 132 defined between the side walls 128 and 130.
Two springs 172 are mounted, one on each side of the handle 112, to urge the blade locking pin 152 toward its first position, yet allow the blade locking pin to be retracted by the user of the tool when it is desired to move a selected one of the tool blades 114, 116 and 118 between its open and closed positions. Each spring 172 is generally oxbow-shaped with a respective loop 174 at each of its ends. Each spring 172 is attached to the respective side walls 128 or 130 of the handle by a fastener 176 such as a screw or rivet extending through the respective loop 174 into the side wall, while the loop 174 at the opposite end of each spring 172 extends around the blade locking pin 152 near the respective end thereof, between the retainer 154 or 156 and the respective side wall of the handle 112.
At the opposite end 178 of the handle 112 a tang or handle stub 180 of a pair of pliers is attached to the handle 112 in the same manner as are the blades 114, 116 and 118. The handle stub 180 has the same profile as the tang 140 and thus can similarly be locked in its extended or open position with respect to the handle 112 for use of the pliers, as shown in
A folding knife 182, shown in
A stop pin 208 extends transversely between the liners 186 and is securely interconnected with them as by fitting tightly in holes defined in the liners 186 at the same end 195 of the handle, and the abutment shoulder 206 rests snugly against the stop pin 208 when the blade 194 is in its open, extended, position for use.
The tang 204 includes a generally flat transverse locking surface 210 which is located in generally the same position as the locking surface 89 of the tang portion 44 of the knife 10 described above. The tang 204 also includes an arcuate peripheral edge 212 that can act as a cam surface as described above in connection with the tang 44, and there is a shoulder 214 adjoining and directed inwardly from the arcuate peripheral edge 212, on the side of the working portion 198 nearer the sharp edge 202.
A pair of elongate openings 216, corresponding with the elongate openings 74 of the knife 10, are defined in the liners 186 and are located opposite each other. A locking pin 218 extends through both of the elongate holes 216, thus extending transversely with respect to the elongate handle 184. The locking pin 218 has a retainer 220 at each of its ends securely fastened in place, as by being formed integrally with a generally cylindrical body portion of the locking pin 218 which has an outer surface 221, or by being mated with the body of the locking pin 218 by suitable threads or the like.
Each of the retainers 220 has a respective base surface 222 facing inwardly toward the outer side 188 of the respective one of the liners 186, with the base surfaces 222 preferably spaced within a distance of 0.003-0.008 inch from the outer sides 188. The retainers 220 extend radially outward about the body by a distance 223 of about 0.06 inch, for example, in order to keep the locking pin 218 oriented substantially perpendicular to the outer sides 188 of the liners 186. The retainers 220 preferably are shaped to include grip surfaces 224 which can easily be engaged securely by the thumb and forefinger of a person using the knife.
Each of the retainers 220 includes an annular groove 226. A pair of springs 228, 229 are mirror opposites of each other and have a generally horseshoe-like shape, each having a laterally inwardly directed end portion 230 or 231 and a small end loop portion 232. The laterally directed end portions 230, 231 each fit into a spring-receiving hole 234 in a respective one of the liners 186, while the end loops 232 fit around the retainers 220 and are received in the grooves 226. When in place, the springs 228 are bent inwardly so that they urge the locking pin 218 toward the end of the handle 184 and thus toward the first, or locking, position of the locking pin 218 with respect to the locking surface 210 of the tang 204, in the same fashion in which the springs 172 urge the blade locking pin 152 toward its first, or locking, position with respect to the locking surface 166 of the tang 140 described above.
A pair of outer plates 236 and 238, which may be of metal or a decorative material such as wood or plastic, are held in place closely alongside the outer sides 188 of the liners 186, by fasteners such as screws 240 and 242 at the rear end of the handle 184. The outer plates 236 and 238 include countersunk shoulders 239 that are also engaged by the heads 243 of the pivot shaft 196, which hold the outer plates 236 and 238 tightly against the liners 186 at the first end 195 of the handle and also are adjusted to provide enough tension to press the liners 186 against the lateral surfaces of the tang 204 to keep the blade 194 from being too loose in the groove 192 between the liners 186.
The outer plates 236 and 238 are mirror opposites of each other, and both define respective spring cavities 244 which are also mirror opposites of each other. The spring cavities 244 provide clearance for the springs 228 to flex and move with respect to the liners 186 as the locking pin 218 moves.
Access openings 246 are defined through each of the outer plates 236 and 238 to surround the retainers 220, which are thus countersunk within the openings 246. The access openings 246 are large enough to provide for the range of motion available for the locking pin 218 in the elongate openings 216, so that the locking pin 218 can be moved against the force of the springs 228 by engaging the grip surfaces 224 with one's thumb and forefinger, to move the locking pin 218 away from its first position and permit the blade 194 to be moved from its open position toward its closed position.
When the blade 194 is in its open position with the abutment shoulder resting against the stop pin 208 as shown in
As may be seen in
The terms and expressions which have been employed in the foregoing specification are used therein as terms of description and not of limitation, and there is no intention, in the use of such terms and expressions, of excluding equivalents of the features shown and described or portions thereof, it being recognized that the scope of the invention is defined and limited only by the claims which follow.
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|Classification aux États-Unis||30/161, 30/160|
|22 nov. 2010||FPAY||Fee payment|
Year of fee payment: 8
|24 nov. 2014||FPAY||Fee payment|
Year of fee payment: 12