US3895441A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telescopic flick knife
Assignee: Individual
•
Filing: 1972-02-07
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Granted: 1975-07-22
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Expires: 1992-02-07
Abstract
Abstract A hand held knife ejector having a power spring to eject the blade and a scroll spring for blade control and recapture. The blade is held in place against a compression power spring by a simple latching device. Upon release of the latching device, the power spring drives the blade outward. A scroll spring is connected to the blade to return it to a cocking position.
Inventors
- 👤 Hobbs H Horak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:01
CPC Classifications
B; B26; B26B; B26B1/00; B26B1/08; F; F41; F41B; F41B13/00
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
143 words
A hand held knife ejector which comprises: a casing having an open end; a power spring within said casing; a knife blade within said casing adjacent said power spring; latching means, including a cocking fork, cooperating with said knife blade for placing and maintaining said power spring in compression; a trigger and trigger bar operatively connected to said latching means for releasing the latching means such that the force of the power spring ejects the knife blade from the casing, the trigger bar forming a unitary member with the latching means; a scroll spring connected to the knife blade for controlling its flight and for recapturing it for redeployment; and a cover on the open end of the casing, the cover being connected to the latching means and cocking fork such that manual closing of the cover places the power spring in compression.
Claim 2
Dependent Claim
143 words
A hand held knife ejector which comprises: a casing having an open end; a power spring within said casing; a knife blade within said casing adjacent said power spring; latching means, including a cocking fork, cooperating with said knife blade for placing and maintaining said power spring in compression; a trigger and trigger bar operatively connected to said latching means for releasing the latching means such that the force of the power spring ejects the knife blade from the casing, the trigger bar forming a unitary member with the latching means; a scroll spring connected to the knife blade for controlling its flight and for recapturing it for redeployment; and a cover on the open end of the casing, the cover being connected to the latching means and cocking fork such that manual closing of the cover places the power spring in compression.
Claim 3
Dependent Claim
31 words
The device of claim 1 wherein the scroll spring is generally cylindrical, the power spring lying totally within the scroll spring and the knife blade extending partially into the scroll spring.
Claim 4
Dependent Claim
87 words
An ejector comprising: a casing having an open end; an abutment mounted within and immovably affixed to said casing; a scroll spring having one end affixed to said abutment; a device attached to the other end of said scroll spring; biasing means for ejecting said device from said casing when said device is in a first cocked position; first latching means connected to said device; and second latching means cooperating with said first latching means for cocking, holding and releasing said device from said first cocked position.
Claim 5
Dependent Claim
87 words
An ejector comprising: a casing having an open end; an abutment mounted within and immovably affixed to said casing; a scroll spring having one end affixed to said abutment; a device attached to the other end of said scroll spring; biasing means for ejecting said device from said casing when said device is in a first cocked position; first latching means connected to said device; and second latching means cooperating with said first latching means for cocking, holding and releasing said device from said first cocked position.
Claim 6
Dependent Claim
35 words
The ejector of claim 3 wherein the scroll spring has an inner coil and an outer coil, and the outer coil is connected to the abutment and the inner coil is connected to said device.
Claim 7
Dependent Claim
39 words
The ejector of claim 4 wherein said biasing means is a compression spring having one of its ends connected to the abutment and its other end acting upon said device when said device is in said first cocked position.
Claim 8
Dependent Claim
15 words
The ejector of claim 5 wherein said compression spring is mounted within said scroll spring.
Claim 9
Dependent Claim
78 words
The ejector of claim 6 wherein said second latching means comprises: a trigger bar; a first latching bar having a first latch on one end for cooperating with said first latching means, the other end of said first latching bar being connected to said trigger bar to form a unitary bar assembly, said assembly being pivotally mounted within said casing; and means for cocking said assembly and thereby moving and holding said device in said first cocked position.
Claim 10
Dependent Claim
123 words
The ejector of claim 7 wherein said cocking means comprises: a cocking fork pivotally mounted within said casing and pivotally connected to said assembly; a tension spring connected at one of its ends to one of the ends of said cocking fork, and the tension spring''s other end being connected to said abutment for urging said cocking fork and thereby said assembly toward said first latching means; a cocking bar having one end pivotally connected to the other end of said cocking fork; and means for moving said cocking bar to move said fork and thereby said assembly away from said device whereby the cooperation between said first latching means and said first latch will move said device to said first cocked position.
Claim 11
Dependent Claim
62 words
The ejector of claim 8 wherein said moving means comprises: a cover pivotally connected to the open end of said casing; a cover latch rigidly affixed to said cover, one end of said cover latch being pivotally connected to the othEr end of said cocking bar; and means for holding said cover closed when said device is in said first cocked position.
Claim 12
Dependent Claim
69 words
The ejector of claim 9 wherein said holding means comprises: a second latching bar having a second latch on one end and connected at its other end to said unitary bar assembly; a third latch on the other end of said cover latch cooperating with said second latch on said second latching bar; and means for urging the second and third latches into engagement when said cover is closed.
Claim 13
Dependent Claim
21 words
The ejector of claim 10 wherein the urging means comprises a biasing spring mounted between the abutment and the trigger bar.
Claim 14
Dependent Claim
13 words
The ejector of claim 11 wherein the device ejected includes an incapacitating element.
Claim 15
Dependent Claim
12 words
The ejector of claim 9 wherein the device includes a knife blade.
Claim 16
Dependent Claim
19 words
The ejector of claim 9 wherein flexible pins connect the device to the inner coil of said scroll spring.
Claim 17
Dependent Claim
78 words
The ejector of claim 8 wherein said second latching means comprises: a trigger bar; a first latching bar having a first latch on one end for cooperating with said first latching means, the other end of said first latching bar being connected to said trigger bar to form a unitary bar assembly, said assembly being pivotally mounted within said casing; and means for cocking said assembly and thereby moving and holding said device in said first cocked position.
Claim 18
Dependent Claim
123 words
The ejector of claim 15 wherein said cocking means comprises: a cocking fork pivotally mounted within said casing and pivotally connected to said assembly; a tension spring connected at one of its ends to one of the ends of said cocking fork, and the tension spring''s other end being connected to said abutment for urging said cocking fork and thereby said assembly toward said first latching means; a cocking bar having one end pivotally connected to the other end of said cocking fork; and means for moving said cocking bar to move said fork and thereby said assembly away from said device whereby the cooperation between said first latching means and said first latch will move said device to said first cocked position.
Claim 19
Dependent Claim
126 words
The ejector of claim 16 wherein said moving means comprises: a cover pivotally connected to the open end of said casing; a cover latch rigidly affixed to said cover, one end of said cover latch being pivotally connected to the other end of said cocking bar; a second latching bar having a second latch on one end and connected at its other end to said unitary bar assembly; a third latch on the other end of said cover latch cooperating with a second latch on said second latching bar; and a biasing spring mounted between the abutment and the trigger bar to urge said trigger bar and thereby said second latch into engagement with said third latch when said device is in said first cocked position.
Claim 20
Dependent Claim
30 words
The ejector of claim 17 further comprising a trigger connected to said trigger bar and extending out of said casing whereby depressing said trigger disengages the second and third latches.
Claim 21
Dependent Claim
12 words
The ejector of claim 18 wherein said device includes a knife blade.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-21 | 1979-01-20 | 1979-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-21 | 1983-01-20 | 1983-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-21 | 1987-01-20 | 1987-07-22 | $7700.00 | Window Closed / Lapsed |