USRE20362E

USRE20362E - Razor

Info

Publication number: USRE20362E
Authority: US
Publication date: 1937-05-11

Description

H. SWAN May 1 l, 1937.

RAZOR Original Filed April 28, 1932 3 Sheets-Sheet 1 Fig. 2. 22 76 R o T N E v m ATTORNE May 11, 1937. SWAN Re. 20,36 2

. RAZOR Original Filed April 28, 1932 5 Sheets-Sheet 2 INVENTOR ATTORNEY May 11, 1937. W I Re. 20,362

' RAZOR Original Filed April 28, 1932 SSheets-Sheet s Y vi" w 1 INVENTCR A s ATTORNEY aessuea' May n, 1937 UNITED STATES PATENT OFFICE.

Incorporated, Wilmington, Del.,

of Delaware a corporation Original No. 1,888,747, dated November 22, 1932 Serial No. 607,905, April 28, 1932. Application for reissue June 10, 1933, Serial No. 675,300

32 Claims.

My invention relates to the razor art and especially to razors of the safety type.

In my copending application Serial No. 563,273 filed September 1'7, 1931, there are disclosed several forms of safety razor wherein a cap is permanently secured to a relatively stationary portion of the razor. A relative-1y rotatable portion of the handle is arranged to engage the cap for holding it in blade clamping position. The present invention provides means in a razor of this type for moving the cap into and out of blade clamping position by rotating the relatively rotatable portion of the handle. In this way the razor may be disassembled by simply turning the rotatable portion of the handle. This rotation first disconnects the handle from the cap and then causes the cap to be rotated about its hinged connection with the stationary portion of the razor. The razor may be assembled again by turning the rotatable portion in the opposite direction.

The nature and advantages of my invention will be apparent from the following description considered in connection with the accompanying drawings, which form a part of this specification and of which:

Fig. 1 is an elevational view, partially in crosssection, of a razor embodying my invention in one form;

Fig. 2 is a cross-sectional view of part of the razor taken in general on the line 22 of Fig. 1;

Fig. 3 is a cross-sectional view taken on the line 33 of Fig. 1;

Fig. 4 is an elevational view, partially in crosssection, of .a portion of the device shown in Fig. 1, but with certain parts in a different position;

Fig. 5 is a top view, partially in cross-section, of a portion of the device shown in Fig. 4;

Fig. 6 is an elevational view, partially in crosssection, of another embodiment of my invention;

Fig. 7 is a cross-sectional view taken on the line 'l--l of Fig. 6;

Fig. 8 is an end view of the device shown in Fig. 6;

Fig. 9 is a cross-sectional view taken on the line 99 of Fig. 6;

Fig. 10 is an elevational view, partially in crosssection, of the device shown in Fig. 6, but with certain of the parts in a different position;

Fig. 11 is an elevational view, partially in crosssection, of still another embodiment of my invention;

Fig. 12 is a cross-sectional View taken on the line l2-I2 of Fig. 11;

Fig. 13 is a cross-sectional view taken on the line l3-l3 of Fig. 11;

Fig. 14 is an elevational View partially in crosssection, of the device shown in Fig. 11, but with certain of the parts in a different position; and

Fig. 15 is a cross-sectional view taken on the line l5-l5 of Fig. 14.

Referring more particularly to Fig. 1, reference character I0 designates generally a handle which comprises a first part II and a second part 12, parts H and I2 being rotatable relative to each other. Part I l is conveniently made in the form of a tube while part I2 is in the form of a rod or shaft extending through tube II. Parts II and I2 are provided with a set of screw threads l3 so that the two parts have threaded engagement. A knob I4 is secured to one end of shaft l2 and is so located that it may be turned while tube H is held stationary.

Rigidly secured to the: end of tube II is a base member l5. Base member I5 is formed with a groove or channel [6 for slidably supporting a rack ll. Rack I1 is formed with a set of teeth 18 on its lower face and another set of teeth [9 on its inner face.

An arm 20 is secured to the under side of base member 15 adjacent to one end thereof. Arm 20 is formed with an opening therethrough to receive a pin 2|. Rigidly secured to pin 2l is forked end 22 of an arm 23. A gear 40 is also rigidly secured to pin 2|, or may be secured directly to one prong of the forked end 22. The other end of arm 23 is secured to a cap 24. Cap 24 is provided with apertures or slots 25 which receive projections 26 carried by the base member I5. Projections 26 serve to position the cap, and shoulders 21 formed on the projections act as a stop for the cap and serve to maintain it parallel to the base member. A pin 28 is secured to the center of the under side of the cap. Pin 28 is provided with threads 29 which are of the same pitch as the threads comprising the set l3. The end of shaft 12, opposite to the end on which is secured knob I4, extends through a central opening in the base member l5. This end of shaft [2 is made hollow and provided with internal screw threads 30 adapted to engage threads 29 on pin 28. This end of shaft i2 is also provided with an integral collar or flange 3|.

A guard member 32 is provided with openings 33 for receiving projections 23. The guard member is preferably formed with guard teeth 34 and has a central opening 35 through which pin 28 is adapted to pass. Opening 35 is small enough so that flange 3| on shaft I2 may not pass therethrough, but will bear against the under side of guard member 32.

Located on shaft I2 below flange 3| are several teeth 36. These teeth preferably do not extend all the way around the shaft in the form of a complete gear for reasons to be explained later. These teeth are adapted to engage teeth I9 on rack I1.

A razor blade 31 is adapted to be clamped between guard member 32 and cap 24. The razor blade is formed with suitable apertures to receive projections 26 and pin 28. The blade is preferably made of flexible material The operation of the razor above described is as follows:

Assume that the razor isin assembled position with a blade clamped in p-laceibetween' the cap and the guard, as is shown in Figs. 1 through 3. If it is desired to disassemble the razonfor any purpose, such as to clean and dry the blade or to replace the blade, tubular'part II of the handle II) is held in one hand while shaft I2 is rotated by turning knob I4 with the other hand as though to unscrew it. This rotation causes shaft I2 to move downwardly with respect to part II, as=. viewed in Fig. 1. This movement also causes shaft I2 to be unscrewed frompin 28. Inasmuch'as the pitch of threads I3 and 29 and 30 is the same, the shaft II may be turned with respect to'part I I and pin 28 at the same time.

The teeth 36'on shaft I2 are so located that, at the instant shaft I2 becomes disengaged from pin 28, teeth 36 are somewhat higher than teeth I9 'on rack I7 and the last tooth, designated 36a has just passed the teeth I9, the shaft being turned in a clockwise direction'as seen in Figs. 2 and 5. Further rotation of shaft I2 causes it to move down still further and by the time the first tooth, designated 36b has come around to teeth I9, it is down far enough to engage one of these teeth. Further rotation of shaft I2 and teeth 36 causes rack I! to move to the left, as viewed in Fig. 1. This movement causes gear 40, which engages teeth' I8 on rack I1, to rotate in a counterclockwise direction. Inasmuch as gear 40 is rigidly secured to arm 23, either directly or through pin. 2I, cap 24 is caused to rotate with respect to base member I to the position shown in Fig.4. In this position blade 37 and guard member 32 may be removed.

When it is desired to reassemble the razor, guard 32 and blade 31 are placed in proper po-- sition on'base member I5 and knob I4 is turned inthe opposite direction; that is as to screw knob I4 onto part II. Teeth 36 being still in engagement with teeth I9 on rack II, the rack is caused to move to the right and rotates gear 40 in a clockwise direction, as illustrated. This causes cap 24 to be rotated into blade clamping position; When 'cap 24 reaches this position tooth 36b disengages from teeth I9 and further rotation of shaft I2 causes threads 3|Jto engage threads 29 on the pin 28. By the time tooth 36a has come'around to teeth I9,'the shaft I2 has been raised sufficiently so that tooth 36a is above the teeth I9 and hence does'not engage them. As knob. I4 is turned, flange 3I- is raised with the shaft '12 and forces guard member 32 upwardly and thus the blade 31 is clamped between the guardmember and cap 24; Inasmuch as cap 24 is in engagement with shaft I2 by means of

threads

29 and 30, the cap cannot be displaced by guard member 32 and blade 3'! being forced up against it.

In Figs.- 6 through 10, there is illustrated a somewhat modified embodiment of my invention. The razor comprising this embodiment consists of a handle IIJ made up of a tubular part II and a shaft I2. Secured to one end of part II is a base member I 5. Base member I5 supports a rotatable shaft 42 which is provided with a bevelled gear 43 at its inner end and another bevelled gear 44 at its outer end. A bevelled gear 45 meshes with gear 44 and is rigidly secured to pin 2| which is journalled in arms 4I secured to or integral with base member I 5. The forked end 22 of arm 23 is also rigidly secured to pin 2I. Cap 24, which is rigidly secured to arm 23 in this embodiment is not provided with openings therethroug'h, but is formed with recesses 46 in its under face. These recesses are adapted to receive'projections 26 which, in this embodiment, are not as high as were the projections shown in the first embodiment. The central under side of cap 24 is provided with a pin 28 on which are formed threads 29 adapted to engage threads 36 formed in the hollow end of shaft I2. Shaft I2 and tubular part II have threaded engagement in this embodiment in the same manner as shown. at I3 in Fig. 1.

A guard member 32 provided with apertures 33 is carried by base member I5. A blade 31 is adapted to be clamped between guard member 32 and cap 24.

A flange 3I is secured to the upper end of shaft I2 and bears against the under side of guard 32. On the under side of flange 3I is located a plurality of bevel gear teeth 41. Gear teeth 41 do not form a complete gear but 'com-' prise only a few teeth, as was'the case with teeth 35 in the first embodiment.

The operation of the device just described is as follows:

Assuming the razor to be in assembled position, as is shown in Fig. 6, rotation of shaft I2 causes the shaft to move downwardly, as indicated by the arrow A, with respect to tubular part II and with respect to pin. 28. When the shaft has been turned far enough so that threads 29 and 39 are disengaged, teeth 41 engage teeth on bevelled gear 43 and cause shaft 42 to rotate. This rotation is transmitted through bevelled gearsv 44 and 45 to pin 2| which causes cap 24 to rotate with respect to base member l5. The cap is rotated to the position shown in Fig. 10. In this position the blade and guard may be removed. When it is desired to reassemble the razor, the blade and guard are placed in position on base member I5 and shaft I2 is turned in the opposite direction to that indicated by the arrow A. Inasmuch as teeth 41 are in engagement with bevelled gear 43 this causes rotation of shaft 42 and cap 24 is rotated until it comes to rest :on projections 26. At this point teeth 41 disengage from bevelled gear 43 and further rotation of shaft I2 causes threads 29 and 39 to engage. Flange 3| forces guard 32 and blade 31 upwardly against cap 24, which is held from rotating due to the fact that

threads

29 and 30 are in engagement.

Teeth 41 do not extent all the way around the upper end of shaft I 2 for the same reason that'teeth 36 did not extend all the way around. Hence, shaft I2 may be turned a portion of a turn and thus moved downwardly, between the time when last tooth 41a clears gear 43 and the time when first tooth 41b comes into engagement with gear 43. This allows for an appreciable overlapping beforecontact of tooth 411) with the teeth of gear 43. If teeth 41 were dis-' posed all the way around shaft I2, they would at first just touch the ends of the teeth on gear 43 and might slip over them before the shaft had turned sufiiciently to bring them down. far enough to actually engage the teeth. This would cause unnecessary wear and the gears might possibly become jammed.

A further embodiment of my invention is illustrated in Figs. 11 through 15. In this embodiment the handle comprises a tubular part II and a shaft I2. One end of shaft I2 is provided with a knob I4 and the parts are formed with a set of threads I3 adapted to engage each other. Another set of threads 50 is formed on the parts II and I2. Set of threads 5|] has a greater pitch than does set I3. These threads are so spaced on parts I I and I2 that the threads of set 50 come into engagement immediately after the threads of set I3 have become disengaged. The result is that when the shaft I2 is being turned so as to lower it with respect to tubular part II, the shaft moves downwardly a certain 7 distance with relation to part II for each turn of the handle while threads I3 are in engagement, and moves a greater distance for each turn when threads 50 come into engagement. Obviously, threads I3 and threads 50 should not be in engagement at the same time due to the fact that they have a different pitch.

A base member I5 is rigidly secured to one end of tubular part II. Base member I5 is formed with a slot I6 in which is slidably positioned a rack I'I. Rack I1 is provided with a recess 5|. One end of rack I1 is formed with an internal cam surface 52 which preferably has the outline disclosed in Figs. 11 and 14.

Base member I5 is formed with an arm having a circular opening therethrough which receives a pin 2|. Pin 2| supports the forked end 22 of an arm 23 which is rigidly secured to a cap 24. One of the prongs of the forked end 22 of arm 23 is provided with a pin 53 which is adapted to contact the cam surface 52 of rack I1.

Cap I4 is formed with recesses 25 for receiving projections 26 carried by base member I5. The cap is also provided with a centrally located pin 28 having thread-s 29 formed thereon. Threads 29 are adapted to engage threads 30 formed in the tubular end of shaft I2.

Threads

29 and 30 have the same pitch as do the threads comprising the set I3.

The upper end of shaft I2 is formed with a flange 3|. Located below flange 3| is a single tooth 54 which is adapted to engage recess 5| formed in rack II. In place of the single recess 5| and single tooth 54 several teeth could be formed on both the shaft I2 and rack II, as shown in the embodiment illustrated in Figs. 1 through 5.

The various parts are so proportioned and spaced that threads 29 and 3|] become disengaged at the same time that the threads making up the set I3 become disengaged. In other words, during the time while the threads of set 50 are in engagement, the threads of the set l3 and

threads

29 and 30 are out of engagement.

The operation of this embodiment is as follows:

Assume the razor to be in assembled position as shown in Fig. 11. Rotation of shaft I2 in the proper direction causes it to move downwardly with respect to tubular part II as viewed in Fig. 11. The distance which the shaft moves for each complete turn thereof is determined by the pitch of the threads making up set I3. At the same time, shaft I2 is being unscrewed from pin 28. When the shaft has been turned sufficiently so that the threads of the set I3 become disengaged,

threads

29 and 30 also become disengaged. Further rotation of shaft I2 causes the threads comprising the set 50 to become engaged. At this point tooth 54 is in the position shown in Fig. 15, that is, it has just passed over rack I'I. When the shaft I2 is rotated from this position with threads 50 in engagement, the shaft moves downwardly further than it would had threads I3 remained in engagement, due to the greater pitch of threads 50. Hence, by the time tooth 54 is turned to the position shown in Fig. 12, where it is about to. engage recess 5| in rack II, the tooth is further down than it would have been if threads 50 of the greater pitch had not been employed. Hence, tooth 54 has better engagement than it otherwise would have had, and better engagement than does the first tooth 361) shown in Fig. 2.

Further rotation of shaft I2 from the position shown in Fig. 12 causes rack H to move to the left, as viewed in Fig. 11. This movement causes 'cam surface 52 to be pressed against pin 53. This causes pin 53 to move to the left and, inasmuch as it is mounted on arm 23 which is pivoted on pin 2|, cap 24 is rotated to. the position shown in Fig. 14. In this position the blade 31 and the guard member 32 may be removed.

When it is desired to reassemble the razor, guard 32 and blade 31 are put in place on base member I5 and shaft I2 is rotated in the opposite direction. This causes rack II to move to the right, as viewed in Fig. 14. This causes the lower left hand portion of the cam surface 52 to. press against pin 53 with the result that the pin slides.

up on this surface and causes arm 23 and cap 24 to rotate in a clockwise direction about pin 2| until it comes to rest on shoulders 21 of projections 26.

At this point tooth 54 leaves recess 5| and by the time it has come back to the position shown in Fig. 15, threads 50 have become disengaged and threads I3 have become engaged. At the same time that threads I3 become engaged,

threads

29 and 30 also become engaged. Further rotation of the shaft I2 causes it to move upwardly with respect to tubular part II and flange 3| forces guard member 32 and blade 31 upwardly against cap 24, thus clamping the blade between the cap and the guard member.

It will be apparent that the arrangement of threads I3 and 50 disclosed in the embodiment illustrated in Figs. 11 through 15 may be employed with equal advantage in the other two embodiments illustrated.

It will be noted that, in each of the embodiments, the hinge comprising arm 20, pin 2| and arm 23 is located underneath the base member I5. This hinge could be located beyond the end of the base member, that is directly below the vertical part of arm 23. However, an advantage is gained by locating it in the position shown. This advantage is that the cap is better balanced the nearer the hinge is to the center of the cap. Obviously, if the hinge were located far enough under the cap, there would be as much weight on one side of the hinge as on the other and very little force would be required to rotate the cap. By locating the hinge some distance inwardly from the end of the cap, the cap is balanced to some extent. Besides this, the hinge so located is protected from injury and results in the razor having a neater appearance.

40- "and a second part, said parts being relatively is not of the .reversible type, it is obvious that a reversible-guard,'such as :is disclosedin my aboveidentified copending application, could be- -employed without in anyway departing from the spirit of. this invention.

WhileI have shown and described three embodiments of my inventionit is to be'understood that they arefor illustrative purposes only and are-not to-.be considered as limiting the scope said cap for-first rotating the cap into blade clamping position with respect to said guard and then holding the cap in said position.

2. In a safety razor of the double edge flexible bladetype, a base member,-a cap pivoted at one end to the base member, a guard betweenthe base member and the cap, cap rotating means, and a member engageable successively with'the, capand the cap rotating means.

3. In a-razor, a handle comprising a first part and a second part, said parts beingrelatively rotatable, a base member secured to said first part,

' cap hinged to said base member, and cap rotating means, one of said parts upon rotation being engageable successively with'the cap rotating means and with the cap.

4. In a razor, a handle comprising a first part rotatable, a base member secured to said first part, a cap hinged to said base member,. a motion transmitting member movably supported by said base member, means on said second part for engaging andmoving said motion transmitting member upon relative rotation of said parts, means secured to said cap for engaging said motion transmitting member so that movement thereof causes rotation ofsaid cap with re- "spect to said base member, and means on said cap for direct engagement with said second part.

5. In a razor, a handle comprising a firstpart and a second part, said parts being relatively rotatable, a base member secured to said first part, a cap hinged to said base member,. a guard having guard teeth on opDQsite edges supported by said base member, a double edged blade adapted to be clamped between said cap and said guard, a rack slidably supported by said base member,

'said rack having one or more teeththereon, said.

second part having one or more teeth formed thereon for engagement with said rack, and means securedto said cap for engaging said .rack so that movement of said rack causes rotation of said cap with respect to said base member.

6. In a razor, a handle comprising a firstpart and a second part, said parts being-relatively rotatable, a base member securedto said first part, a cap hinged to said basemember, arack slidably supported by said base. member, said rack havingone or more teethformed thereon, said second part having one or more teeth formed thereon for engagement with said rack, said rack having a cam surface, and means secured .to said cap for contacting said cam surface so that move- 20,362 .Whilethe gu'ardin the embodimentsillustrated- 1 ment of said rack causes rotation ofsa'i d can with respect to said base member.

7. 1m a razor, a handle comprising a. first part and a second part, said parts being relatively rotatable, a base member secured to said first part, a cap hinged to said base member, a rack slidably supported by said base member, said rack having one or moreteeth formed thereon, said second part having one or more teeth formed thereon for engagement with said rack, said rack being formed with an internal camsurface, and-means on'said cap for contactingsaid cam surface so that movement of said .rack in one directioncauses rotation of said cap inone direction with, respect to said base member and movement of, saidrack in the opposite direction causes rota! tionof said cap inthe opposite direction.

8. In a razor, a handle comprising a first part and a second part, said parts being relatively rotatable, a base member secured to said .firstv part, a cap rotatablysecured to said base mem.- ber, edges supported by said base member, a double edged blade adapted to be clamped between said cap and said guard, a gear secured to said-cap at the axis cfrotation thereof, a rack slidably supported by said base member, said rack having one or more teeth, saidgear having engagesecured to'said shaft for engagement with theteeth on said secondpart.

10. In a razor, a handle comprising a first part having threads formed thereon and a second part having threads for engagement with the firstmentioned threads, a base member secured to.

said first part, a cap rotatably secured to said base member, a pin securedto said cap and having threads formed thereon, one end of said second part being formed with threads for engaging the threads on said pin, the location and axial. extent of the threads. ongsaid pin being such.

with respect .to the, threads on said parts which engage with each other that said second part maybe disengaged from said pin while still en-j gaged with said first part, and means operable upon rotation of said second part while disen-v gagedfrom said pin for rotating said cap with respect to said base member.

11. In a razor, ahandle comprising a first part having. threads .formed thereon .and a second.

part havingthreads-for engagement with the first-mentioned threads, a base ,member secured to said. first part, a cap rotatably secured to said.

base'membena pin securedto said cap and having threads formed thereon, one end of said second part being formed with threads for engaging. the threads; on-saidpin, the location and axial.

extent of ''the threads onsaid pin-being such with respect to thethreadson saidparts which engage with each other-that said second ,part maybe disengaged from saidpin while still ena guard having guard teeth on opposite gaged with said firstpart, aniotiontransmitting;

member movably supported bysaidbase member; means on said second part for engaging and moving said motion transmitting member upon rotation of said second part while disengaged from said pin, and means on said cap for engaging said motion transmitting member so that movement thereof causes rotation of said cap with respect to said base member.

12. In a razor, a handle comprising a first part having threads formed thereon and a second part having threads for engagement with the firstmentioned threads, a base member secured to said first part, a cap rotatably secured to said base member, a pin secured to said cap and having threads formed thereon, one end of said second part being formed with threads for engaging the threads on said pin, the location and axial extent of the threads on said pin being such with respect to the threads on said parts which engage with each other that said second part may be disengaged from said pin while still engaged with said first part, a rack slidably supported by said base 'member and having one or more teeth, said second part having one or more teeth and being positioned so as to engage said rack when saidsecond part is disengaged from said pin, and means on said cap for engaging sa'd rack so that movement of said rack causes rotation of said cap with respect to said base member.

13. In a razor, a handle comprising a first part having threads formed thereon and a second part having threads for engagement with the firstmentioned threads, a base member secured to said first part, a cap rotatably secured to said base member, a pin secured to said cap and having threads formed thereon, one end of said second part being formed with threads for engaging the threads on said pin, the location and axial extent of the threads on said pin being such with respect to the threads on said parts which engage with each other that said second part may be disengaged from said pin while still engaged with said first part, a rack slidably supported by said base member and having one or more teeth, said second part having one or more teeth and being positioned so as to engage the teeth on said rack when said second part is disengaged from said pin, said rack having a-cam surface, and means secured to said cap for contacting said cam surface so that movement of said rack causes rotation of said cap with respect to said base member.

'14. In a razor, a handle comprising a first part having threads formed thereon and a second part having threads for engagement with the firstmentioned threads, a base member secured to said first part, a cap rotatably secured to said base member, a pin secured to said cap and having threadsformed thereon, one end of said second part being formed with threads for engaging the threads on said pin, the location and axial extent of the threads on said pin being such with respect to the threads on said parts which engage with each other that said second part may be disengaged from said pin while still engaged with said first part, a rack slidably supported by said base member and having one or more teeth, said second part having one or more teeth and being positioned so as to engage said rack when said second part is disengaged from said pin, said rack having an internal cam surface, andmeanson said cap for contacting said cam surface so that movement of said rack in one direction causes rotation of said capin one direction with respect to said base member and movement of said rack in the opposite direction causes rotation of said cap in the opposite direction.

15; In a razor, a handle comprising a first part having threads formed thereon and a second part having threads for engagement with the firstmentioned threads, a base member secured to said first part, a cap rotatably secured to said base member, a pin secured to said cap and having threads formed thereon, one end of said second part being formed with threads for engaging the threads on said pin, the location and axial extent of the threads on said pin being such with respect to the threads on said parts which engage with each other. that said second part may be disengaged from said pin while still engaged with said first part, a gear secured to said cap at the axis of rotation thereof, a rack slidably supported by said base member and having one or more teeth, said gear having engagement with said rack, and said second part having teeth formed thereon and being movable so as to engage said rack when said second part is disengaged from said pin.

16. In a razor, a handle comprising a first part having threads formed thereon and a second part having threads for engagement with the firstmentioned threads, a base member secured to said first part, a cap rotatably secured to said base member, a pin secured to said cap and having threads formed thereon, one end of said second part being formed with threads for engaging the threads on said pin, the location and axial extent of the threads on said pin being such with respect to the threads on said parts which engage with each other that said second part may be disengaged from said pin while still engaged with said first part, a gear secured to said cap at the axis of rotation thereof, a shaft rotatably carried by said base member, a gear secured to said shaft and meshing with the gear onv said cap, another gear secured to said shaft, and said second part having teeth and being movable so as to engage the lastmentioned gear when said second part is disengaged from said pin.

17; In a razor, a handle comprising a first part and a second part, two sets of threads on said parts for providing threaded engagement between the two parts, the pitch of one set being different than the pitch of the other set, said sets being so spaced that, upon relative rotation of the two parts, the threads of one set come into engagement after the threads of the other set have become disengaged, a base member secured to said first part, a cap rotatably secured to said base member, a pin secured to said cap and having formed thereon threads of the same pitch as the threads of the set having the smaller pitch, one end of said second part being formed with threads for engaging the threads on said pin, all of the threads of the smaller pitch being so spaced as to engage and disengage at the same time, and means operable upon rotation of said second part when the threads having the larger pitch are interengaged for rotating said cap with respect to said base member. I

18. In a razor, a handle comprising a first part and a second part, two sets of threads on said parts for providing threaded engagement between the two parts, the pitch of one set being different than the pitch of the other set, said sets being so spaced that, upon relative rotation of the two parts, the threads of one set come into engagement after the threads of the other set have become disengaged, a base member secured to said first part, a cap rotatably secured to said base member, a pin secured to said cap and having formed thereon threads of the same pitch as the threads of the set having the smaller pitch, one end of said second part being formed with threads for-engaging the threads on said;pin, all ofthe threads ofi'the smaller-:pitchLbeing so spaced'as to engageand'disengage at the same time,:.a. motion transmitting memberimovably supported bysaid base member, means on said second-part .for engagingand moving said motion transmitting member :upon rotation of saidsecondapart \when the threads having the -larger pitch are interengaged, and means on said cap for engaging said motion transmitting member so that movement thereof causes rotation of said cap with respect to said base member.

19; In a razor, a handle comprising a first part and a second part, two sets of threads on said parts for providing threaded, engagement between .the'two parts; the pitch of one set being different :-than: these-pitch of the other set, said sets-beingso spacedi'thatupon relative rotation of the twocparts, the threads of: one set come into engagementcaftertheithreads ofzathe other set have become disengaged, a base member secured to said first part, a cap rotatably, secured :to ,said base member, .a pin secured to said capand-having' formed thereon threads of the same pitch as the threads of the-set having the smallerpitch, one end of said second part: being'formed -with threads for engaging the threads on saidtpin, all of the threads of the smaller pitch being-so spaced as to engage and disengage at :the same time, a rack slidably supported by said base member, said rack having onecor -more teeth thereon, said second part having "one orwmore teeth formed thereon and so located as to engage said rack 'whenxthe threads having.'the larger pitchare interengaged, andmeans OIIZSfiid cap for engaging said rack so thatmovementof said rack causesrotationof said cap with respectto saidbase member.

:20. In a razor, ahandlecomprisinga first-part and a second part, two setsotthreads .on'said parts for providing threaded engagement ,between the two ,partsjthe pitch of one: set being diiferent than the. pitch, or. the other set, .said sets being so spaced "thatytupon relative rotation of the two parts, thethreads of one set come into engagement after the threadsof the other set have become disengaged, a basemember secured to-said'firstpart, a cap rotatably secured to said base member,- a pin secured-to said cap and having formed thereonsthreads' of the same pitch as the threads of the sethaving the smaller pitch, one end of saidsecond part being formed with threads for engaging the threads on said pin, all of the threads of the smaller pitch being so spaced as to engage-and disengage at the same time, a rackslidably supported by said base member, said rack having one or more teeth thereon, said second part having one or more teeth formed thereon and so located as to engage said rack when the threads having the larger pitch are interengaged, said rack being formed with a cam surface, and means on said cap for contacting said cam surface so that movement of said rack causes rotation of said cap with respect to said base member.

21. In a safety razor, a base member, a cap pivoted at one end to the base member, a guard between the base member and the cap, a double edged flexible blade adapted to be clamped between the guard and the cap, cap rotating means, and a member engageable successively with the cap rotating means and with the cap for first rotating the cap into blade clamping position and then holding the cap in said position.

22. In a razor, a handle comprising a first partanda second apart, said parts being-relatively: rotatable, a base; member secured to a said Lfirstpart; a cap hinged tosaidbase' member, a rack slidably supportedbysaidbase member, said rack havingone or moreteeth thereon, saidsec- 5 0nd part having one or more teeth formed thereonufor engagement ,with. said rack means secured to said cap for engagingsaid rack. so that movement ofsaid rack causes rotation of said cap with respect to said baseimember, and means-on. said :1 cap for direct engagement with said second part.

, 23. In a razor, a handle; comprising ,a first part and a second.part,. said parts being relatively rotatable, a base member secured to said first part,.a cap-hinged. to saidbase member, a .15 rack slidably supported by said base member, said rack having oneor more teeth formed thereon, said secondpart having one. or moreteeth formed thereon for engagement: with said rack, said rack chavingia cam surfacaxmeans'secured to saidcap-"20 v:f'or. contacting said cam surface so that: movement of said rackcauses rotationof said cap with respect-to saidbase member, and means on said cap for direct engagement with, saidsecond part. 2525 1 24.- In a razor, ahandle comprising a first part and a second. part, said parts: being relatively rotatable, aabase member securedto said? first part, a cap rotatably secured to said base member.

a gear secured to. said cap: at. the. axis of rotation 1 30 thereof,-a rack slidablysupported by saidrbase member, said rack having one ormore. teeth,-said gear having engagement with teeth on said rack, said second part having teeth formed thereon for engagement with teeth on said rack,,an'd means on said cap ior direct engagement I with said second' part. l

' 25. Inv a razor, a handle comprising a'firstpart and. a second part, said parts" being relatively rotatable, a base member.- secured to-saldfirst part io a'cap rotatably secured .tos'aid base member, .a gear secured to said' capiat the axis of: rotation thereof, said :second part having teeth: formed thereon, a shaft rotatably:.carried:by said'base member, a gear secured to said shaft and mesh- :45 ing with the gear secured to the cap, a gear secured to said shaft for engagement with the teeth on said secondpart, and means on'said cap for direct engagement with said second part.

26. -In a razor, ahandle comprising a first part4z'50 and a second part, said parts being relatively rotatable,- a base member secured to said first part,

a cap, a hinge for rotatably mounting said cap on said-base member, said hinge being locatedbeneath, and inwardly from one end of said base1n55 'member, and-a guard supported by said base member, said second part being adapted upon rotation to move saidguard toward said cap for clamping a blade therebetween.

27. In a razor, a handle comprising aiirst partto and'a second part, said parts being relatively rotatable, a base member secured to said first part,

a cap, a hinge forrotatably mounting said cap "on said'base member, said hinge being located beneath, and inwardly from one end of, said base. 65 member, a guard supported by said base member, and cap rotating means, said second part being engageable with said cap rotating means and with said guard for rotating said cap and moving said guardtoward said cap forclampinga blade 70 between said guard andsaid cap.

'28. Ina razor, a handle comprising a'first part and a second part, said parts being relatively rotatable, a base member secured to said first part,

a cap, a hinge for rotatably mounting said cap:

on said base member, said hinge being located beneath, and inwardly from one end of, said base member, a motion transmitting member movably supported by said base member, means on said second part for engaging and moving said motion transmitting member upon relative rotation of said parts, means secured to said cap for engaging said motion transmitting member so that movement thereof causes rotation of said cap with respect to said base member, and a guard supported by said base member, said second part being adapted upon rotation tomove said uard toward said cap for clamping a blade therebetween.

29. A safety razor of the double edge flexible blade type including a pivotally mounted cap, a handle member, a first element movable on turning said handle member in a given direction to swing the cap into blade clamping position and a second element movable on further turning said handle member in the same direction to curve the blade into shaving position.

30. A safety razor of the flexible blade type having a swinging blade-shaping cap, an operating device, a train of mechanism operated by movement of said operating device to'swing said cap into blade clamping position, and a second train of mechanism automatically brought into action thereafter and operated by a greater movement of said operating device to clamp the blade.

31. A safety razor of the flexible blade type having a swinging'blade-shaping cap, a handle member, an operating member movable with respect thereto, a train of mechanism operated by movement of said operating member to swing said cap into blade clamping position, and a second train of mechanism automatically brought into action thereafter and operated by a greater movement of said operating member to clamp the blade.

32. A safety razor of the flexible blade type having a swinging blade-shaping cap, a handle member, an operating member rotatable with respect thereto, a train of mechanism operated by rotation of said operating member to swing said cap into blade clamping position, and a second train of mechanism automatically brought into action thereafter and operated by a greater rotation of said operating member to clamp the blade.

HARRY SWAN.