Safety knife
First Claim
Patent Images
1. A safety knife comprising:
- a handle;
a blade mounted on the handle so that at least a portion of the blade projects from the handle;
at least one guard mounted on the handle for movement between an extended position wherein the at least one guard overlies at least a part of the cutting edge of the blade, and a retracted position wherein said part of the cutting edge is exposed;
resilient biasing means for biasing the at least one guard towards the extended position; and
an adjustable stop movable between a locking position, in which the stop prevents the at least one guard from moving from the extended position, and a release position in which the stop permits movement of the at least one guard from the extended position to the retracted position, the stop comprising a rotatable element that rotates by operation of a manipulating member from said locking position in which the stop obstructs movement of a guard part movable with the guard to said release position in which the stop does not obstruct movement of said guard part.
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Accused Products
Abstract
A safety knife comprises a handle and a blade mounted on the handle so that a part of the blade projects from the handle. Two retractable safety guards are also mounted on the handle, overlying opposite sides of the projecting portion of the blade. Each guard is spring-loaded so that pressure from the material being cut causes the guards to retract into the handle as the blade cuts into the material. A manually controlled locking device normally prevents the guards being retracted but, when operated, allows the guards to retract. The guards automatically extend, under the action of springs, when the knife is removed from the material.
74 Citations
22 Claims
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1. A safety knife comprising:
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a handle;
a blade mounted on the handle so that at least a portion of the blade projects from the handle;
at least one guard mounted on the handle for movement between an extended position wherein the at least one guard overlies at least a part of the cutting edge of the blade, and a retracted position wherein said part of the cutting edge is exposed;
resilient biasing means for biasing the at least one guard towards the extended position; and
an adjustable stop movable between a locking position, in which the stop prevents the at least one guard from moving from the extended position, and a release position in which the stop permits movement of the at least one guard from the extended position to the retracted position, the stop comprising a rotatable element that rotates by operation of a manipulating member from said locking position in which the stop obstructs movement of a guard part movable with the guard to said release position in which the stop does not obstruct movement of said guard part. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A safety knife comprising:
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a handle;
a blade mounted on the handle so that at least a portion of the blade projects from the handle;
two guards mounted on the handle on opposite sides of the said portion of the blade for movement between an extended position where they overlie at least a part of the cutting edge of the blade, and a retracted position wherein said part of the cutting edge is exposed;
resilient biasing means for biasing the two guards towards the extended position; and
means for adjusting the position of each of said two guards independently of the other. - View Dependent Claims (18)
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- 19. A safety knife comprising, wherein the adjustable stop means comprise a movable stop element mounted on the handle and formed with a plurality of recesses of different depths which may be selectively moved into the path of movement of a part movable with the at least one guard, whereby the extent of permitted movement of the at least one guard is determined by a depth of the recess which is brought into said path of movement.
Specification