US3872592A - Twin blade injector unit - Google Patents
Twin blade injector unit Download PDFInfo
- Publication number
- US3872592A US3872592A US437859A US43785974A US3872592A US 3872592 A US3872592 A US 3872592A US 437859 A US437859 A US 437859A US 43785974 A US43785974 A US 43785974A US 3872592 A US3872592 A US 3872592A
- Authority
- US
- United States
- Prior art keywords
- unit
- blade
- spacer
- blades
- razor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 125000006850 spacer group Chemical group 0.000 claims abstract description 41
- 238000005520 cutting process Methods 0.000 claims abstract description 25
- 238000003780 insertion Methods 0.000 claims description 10
- 230000037431 insertion Effects 0.000 claims description 10
- 238000000034 method Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 239000000344 soap Substances 0.000 description 3
- 238000005304 joining Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
- B26B21/00—Razors of the open or knife type; Safety razors or other shaving implements of the planing type; Hair-trimming devices involving a razor-blade; Equipment therefor
- B26B21/08—Razors of the open or knife type; Safety razors or other shaving implements of the planing type; Hair-trimming devices involving a razor-blade; Equipment therefor involving changeable blades
- B26B21/14—Safety razors with one or more blades arranged transversely to the handle
- B26B21/24—Safety razors with one or more blades arranged transversely to the handle of the magazine type; of the injector type
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/56—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits
- B29C65/64—Joining a non-plastics element to a plastics element, e.g. by force
- B29C65/645—Joining a non-plastics element to a plastics element, e.g. by force using friction or ultrasonic vibrations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/74—Joining plastics material to non-plastics material
- B29C66/742—Joining plastics material to non-plastics material to metals or their alloys
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/718—Cosmetic equipment, e.g. hair dressing, shaving equipment
- B29L2031/7186—Shaving equipment
Definitions
- the razors and dispensers common in the art vary considerably but in general the razors are characterized by having the blade clamped between a bridge or platform and an overhanging cap, the dispenser having a tang insertable in the razor head to open up a space sufficient to free the blade and thereupon a slide on the dispenser is manipulated to push forward the blade into the razor head, the advancing end engaging the used blade and pushing it out of the razor head. The dispenser tang is then withdrawn leaving the new blade in clamped position in the razor head. Reliable blade changing operation depends upon the forward end of the incoming blade engaging the outer end of .the blade in the head and pushing it from the razor and not by-passing the end of the used blade.
- the present invention concerns a twin or double in jector blade unit comprising two superposed blades permanently secured together with an intervening spacer, the cutting edge of the top blade being spaced rearwardly a small distance from the cutting edge of the lower blade.
- the U.S. Pats. to Gray No. 1,975,757 and Tomek No. 3,262,206 disclose various forms of such a blade arrangement in general.
- the British Pat. No. 772,532 of 1957 shows a blade unit of the type having a pair'of superposed double edge blades secured together with an intervening spacer.
- the normal injector type razor is designed to receive the standard single edge blade having a thickness commonly in the range of 0.01 'to 0.012 inch. Excessive opening of the razor by the dispenser tang must be avoided otherwise the ingoing blade end may slip past the end of the used blade in the razor resulting in jamming. Under the circumstances the replacement blade unit of the type concerned must be limited in thickness.
- One double injector blade unit presently on the market comprises merely two blades secured directly together having overall thickness of about 0.020 of an inch.
- the double blade unit of the present invention embodies a spacer but the individual blades are made thiner, each having a thickness of about 0.006 of an inch and the spacer a thickness of about 0.008. The overall thickness thereby being about 0.020 of an inch.
- the spacer is shaped to terminate a short distance from the normally razor entering end of the unit. Injector razors of this type commonly in use have a rounded or coined bevel at the right end of the bridge at the blade entering end and in most cases also the corresponding end of the cap also has at least a slight radlus, enabling the ready entrance of the present type blade unit.
- FIG. 1 is an exploded view of the three elements comprising the blade unit.
- FIG. 2 is a top plan view of the assembled parts.
- FIG. 3 is a bottom plan view of the assembled parts.
- FIG. 4 is a cross-sectional view taken on the plane 44 of FIG. 2.
- FIG. 5 is a view in perspective indicating the procedure and effect of the injection of the unit in a representative type injector razor.
- the blade unit comprises three elements, a top blade 10, a spacer-11 and a bottom blade 12.
- the blades 10 and 12 which are of the usual steel material may be identical as a matter of convenience and economy in manufacture.
- the top blade has its cutting edge 14 set back from the cutting edge 15 by a small distance such as about l/32 of an inch.
- Each blade has a width of about 0.315 of an inch and the overall width of the assembled unit is slightly larger with a maximum of about 0.350 of an inch.
- the blades each have rectangular openings 16 which are utilized in the manufacture of the blade strip and they have no function in the final unit as employed in a razor.
- the spacer element 11 may be made of any one of various materials such as metal or plastic but preferably is composed of stainless steel corresponding to the material in the blades which preferably is stainless steel.
- the back edge 17 of the spacer may coincide with the back edge 18 of the lower blade 12 as indicated in the cross-sectional view of FIG. 4, although it is not a necessary condition.
- the method of joining the three elements may be varied as by mechanical means, such as staking or bent tabs or it may be by adhesive bonding including application of heat or by pressing or soldering or welding. In the specific form disclosed the preferred method of joining is by spot welding. In the case of a plastic spacer examples of assembly methods are hot staking or ultrasonic staking. Also if desired each of the blades near its front cutting edge is provided with a row of openings such as the slots 20 which are adapted to serve a function to be later described. As is indicated in FIG. 4 the front edge 21 of the spacer is positioned rearwardly of the slots 20 in the bottom blade for a purpose which will be described shortly.
- the forward end 25 of the spacer terminates short of the end 26 of the two blades and the unit as a whole.
- the space between the end 25 of the spacer and the end 26 of the unit may vary, depending somewhat on the thickness of the spacer and of the respective blades among other factors but desirably is in the range below about /8 of an inch and preferably about 1/16 of an inch as in the embodiment shown.
- the three elements are in the present embodiment spot welded together at a series of spaced points which in the present case comprises three points, 28, 29 and 30.
- the position of the spot weld 28 is of some importance and should be relatively close to the end 25 of the spacer to reduce or avoid any tendency of the ends of the blades to be deflected away from each other at that 3 end of the unit and preferably the ends of the blades may incline toward each other for the reason to be discussed shortly.
- each of the three elements may vary somewhat within practical ranges providing the overall thickness is not too great which in most cases is preferably in the range below about 0.025 of an inch.
- the blades should be in the range of 0.004 to 0.008 of an inch and the spacer in the range preferably of 0.006 to 0.010 of an inch. As a specific preferred combination the blades are each 0.006 of an inch in thickness and the spacer is 0.008 of an -inch in thickness, the unit thereby having an overall thickness of 0.020 of an inch.
- the radii 31 and 32 facili'tate the initial entrance of the blade unit and immediately after the initial entrance the ends of the two blades are deflected toward each other as indicated at 38 which assures that the forward end of the unit willengage the rear end of the blade in the razor and will slide the used blade outwardly to the left, whether it is a standard blade having a thickness of no more than about 0.012 of an inch or is a unit similar to that being inserted.
- injector razors of the type involved usually have a slot extending down through the bridge or a series of slots.
- FIG. 5 shows a single slot 40, and as previously mentioned the blades have a row of holes 20 near their cutting edge.
- a safety razor injector blade unit adapted to be inserted in and fit a single edge injector razor, said unit comprising two thin blades each with a forward cutting edge and an intervening thin spacer, said blades and spacer being permanently secured together, the cutting edge of each blade extending for substantially the entire overall length of the respective blade, said unit having a first end adapted to be the advance end of the unit in insertion in the razor, the spacer occupying the major portion of the length of the unit but terminated short of said first end and the blade cutting edges, whereby upon insertion of the unit in a razor the corresponding ends of the blades may flex toward each other.
- a safety razor injector blade unit in accordance with claim 1 in which the blades each have a thickness of not more than 0.008 of an inch, and the spacer has a thickness of not more than 0.010 of an inch.
- a safety razor injector blade unit in accordance with claim 1 in which the overall thickness of the unit is within the range below 0.025 of an inch.
- a safety razor injector blade unit in accordance with claim 1 in which the spacer is terminated short of the advance end of the unit by a distance in the range of below about of an inch.
- a safety razor injector blade unit in accordance with claim 1 in which the forward cutting edge of the top one of the blades is set back of the forward cutting edge of the other blade.
- a safety razor injector blade unit adapted to be inserted in and fit a single edge injector razor, said unit comprising two thin blades each having a thickness in the range of0.004 to 0.008 of an inch and each having a forward cutting edge extending for substantially the entire overall length of the respective blade, and an intervening thin spacer having a thickness in the range of 0.006 to 0.010 of an inch, said blades and spacer being permanently secured together to form a unit having an overall thickness below 0.025 of an inch, said unit having a first end adapted to be the advance end of the unit in insertion in the razor, the spacer occupying the major portion of the length of the unit but terminated short of said first end and the blade cutting edges by a distance of about 1/16 of an inch, whereby upon insertion of the unit in an injector razor the corresponding ends of the blades may flex toward each other.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Forests & Forestry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Knives (AREA)
Abstract
Description
Claims (8)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US437859A US3872592A (en) | 1974-01-30 | 1974-01-30 | Twin blade injector unit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US437859A US3872592A (en) | 1974-01-30 | 1974-01-30 | Twin blade injector unit |
Publications (1)
Publication Number | Publication Date |
---|---|
US3872592A true US3872592A (en) | 1975-03-25 |
Family
ID=23738222
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US437859A Expired - Lifetime US3872592A (en) | 1974-01-30 | 1974-01-30 | Twin blade injector unit |
Country Status (1)
Country | Link |
---|---|
US (1) | US3872592A (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5036587A (en) * | 1990-08-29 | 1991-08-06 | The Gillette Co. | Razor blade assembly |
DE9004760U1 (en) * | 1990-04-27 | 1991-08-29 | Wilkinson Sword Gmbh, 5650 Solingen, De | |
DE9004762U1 (en) * | 1990-04-27 | 1991-08-29 | Wilkinson Sword Gmbh, 5650 Solingen, De | |
EP1046475A1 (en) * | 1999-04-21 | 2000-10-25 | Warner-Lambert Company | Razor assembly and cartridge with wash-through holes |
US20120226298A1 (en) * | 2006-03-09 | 2012-09-06 | Boston Scientfic Scimed, Inc. | Cutting blade for medical devices |
US8671576B1 (en) * | 2012-03-27 | 2014-03-18 | Vernon P. Hotella | Divisible head razor device |
US10654184B1 (en) * | 2019-10-04 | 2020-05-19 | Angel Lia Richitelli | Razor for shaving |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2654149A (en) * | 1949-09-15 | 1953-10-06 | Gillette Co | Safety razor |
US3262206A (en) * | 1962-11-28 | 1966-07-26 | Harry F Tomek | Razor blades |
US3724070A (en) * | 1971-03-15 | 1973-04-03 | Gillette Co | Dual razor blade assembly |
-
1974
- 1974-01-30 US US437859A patent/US3872592A/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2654149A (en) * | 1949-09-15 | 1953-10-06 | Gillette Co | Safety razor |
US3262206A (en) * | 1962-11-28 | 1966-07-26 | Harry F Tomek | Razor blades |
US3724070A (en) * | 1971-03-15 | 1973-04-03 | Gillette Co | Dual razor blade assembly |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE9004760U1 (en) * | 1990-04-27 | 1991-08-29 | Wilkinson Sword Gmbh, 5650 Solingen, De | |
DE9004762U1 (en) * | 1990-04-27 | 1991-08-29 | Wilkinson Sword Gmbh, 5650 Solingen, De | |
US5063669A (en) * | 1990-04-27 | 1991-11-12 | Wilkinson Sword Gesellschaft Mit Beschrankter Haftung | Razor head, especially razor blade unit, of a wet razor |
US5063668A (en) * | 1990-04-27 | 1991-11-12 | Wilkinson Sword Gesellschaft Mit Beschrankter Haftung | Razor head, especially razor blade unit, of a wet razor |
US5036587A (en) * | 1990-08-29 | 1991-08-06 | The Gillette Co. | Razor blade assembly |
EP1046475A1 (en) * | 1999-04-21 | 2000-10-25 | Warner-Lambert Company | Razor assembly and cartridge with wash-through holes |
US20120226298A1 (en) * | 2006-03-09 | 2012-09-06 | Boston Scientfic Scimed, Inc. | Cutting blade for medical devices |
US8679141B2 (en) * | 2006-03-09 | 2014-03-25 | Boston Scientific Scimed, Inc. | Cutting blade for medical devices |
US8671576B1 (en) * | 2012-03-27 | 2014-03-18 | Vernon P. Hotella | Divisible head razor device |
US10654184B1 (en) * | 2019-10-04 | 2020-05-19 | Angel Lia Richitelli | Razor for shaving |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: BANKERS TRUST COMPANY A NEW YORK BANKING CORPORATI Free format text: SECURITY INTEREST;ASSIGNOR:AMERICAN SAFETY RAZOR COMPANY;REEL/FRAME:004324/0601 Effective date: 19840709 |
|
AS | Assignment |
Owner name: AMERICAN SAFETY RAZOR COMPANY Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:BANKERS TRUST COMPANY, AS AGENT;REEL/FRAME:005351/0018 Effective date: 19890413 |
|
AS | Assignment |
Owner name: FIRST NATIONAL BANK OF BOSTON, THE Free format text: SECURITY INTEREST;ASSIGNOR:AMERICAN SAFETY RAZOR COMPANY, A DE CORP.;REEL/FRAME:005385/0278 Effective date: 19890414 |
|
AS | Assignment |
Owner name: AMERICAN SAFETY RAZOR COMPANY, VIRGINIA Free format text: TERMINATION OF SECURITY INTEREST IN PATENTS;ASSIGNOR:FIRST NATIONAL BANK OF BOSTON, THE, AS AGENT;REEL/FRAME:007919/0324 Effective date: 19950803 |