US1995679A - Hack saw frame - Google Patents

Hack saw frame Download PDF

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Publication number
US1995679A
US1995679A US728093A US72809334A US1995679A US 1995679 A US1995679 A US 1995679A US 728093 A US728093 A US 728093A US 72809334 A US72809334 A US 72809334A US 1995679 A US1995679 A US 1995679A
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United States
Prior art keywords
arm
frame
blade
saw
handle portion
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
Application number
US728093A
Inventor
Frederick H Kelley
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
G W GRIFFIN CO
Original Assignee
G W GRIFFIN CO
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by G W GRIFFIN CO filed Critical G W GRIFFIN CO
Priority to US728093A priority Critical patent/US1995679A/en
Application granted granted Critical
Publication of US1995679A publication Critical patent/US1995679A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D51/00—Sawing machines or sawing devices working with straight blades, characterised only by constructional features of particular parts; Carrying or attaching means for tools, covered by this subclass, which are connected to a carrier at both ends
    • B23D51/08—Sawing machines or sawing devices working with straight blades, characterised only by constructional features of particular parts; Carrying or attaching means for tools, covered by this subclass, which are connected to a carrier at both ends of devices for mounting straight saw blades or other tools
    • B23D51/12—Sawing machines or sawing devices working with straight blades, characterised only by constructional features of particular parts; Carrying or attaching means for tools, covered by this subclass, which are connected to a carrier at both ends of devices for mounting straight saw blades or other tools for use with tools, dealt with in this subclass, which are connected to a carrier at both ends, e.g. bows adjustable in length or height
    • B23D51/125—Blade tensioning means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D49/00—Machines or devices for sawing with straight reciprocating saw blades, e.g. hacksaws
    • B23D49/10—Hand-held or hand-operated sawing devices with straight saw blades
    • B23D49/12—Hacksaws

Definitions

  • This invention relates to hack saw frames and and has for its object to provide a novel hack saw frame which is inexpensive to manufacture, which is constructed so that the saw blade can 5. bequickly and easily installed in the frame or removed therefrom and which is further so constructed as to hold the saw blade under the proper amount of tension.
  • Fig. 1 is a side view of a hack saw frame embodying the invention
  • Fig. 2 is a fragmentary view showing a portion of the blade-carrying arm and the blade-locking member
  • Fig. 3 is a section on the line 3--3, Fig. 1 with parts broken out;
  • Fig. 4 is a section on the line 44, Fig. 1;
  • Fig. 5 is a section on the line 5--5, Fig. 1.
  • My improved hack saw frame which is indicated generally at 1, is made from a length or strip of material which is bent to form the back portion 2 of the frame, a blade-carrying arm 3 extending laterally from one end of the back portion, and a handle portion 4 extending laterally from the other end of the back portion.
  • the handle portion 4 is considerably longer than the blade-carrying arm 3 and the end of said handle portion is bent into a U shape as indicated at 5 so that the arm 6 of the U is directed backwardly toward the back 2.
  • the extremity of the arm 6 is provided with a pin or projection 7 adapted to enter the usual aperture in one end of the saw blade 8.
  • the other end of the saw blade 8 is attached to the end of the blade-carrying arm 3 in such a way that when the blade is installed in the frame the frame will be flexed slightly and the arm 3 and handle portion 4 will be drawn together slightly from their normal position.
  • the frame 2 has some resiliency and because of the flexed condition of the frame the resiliency thereof serves to hold the blade 8 taut and under the proper degree of tension.
  • the handle portion 4 is provided with a han dle grip 9 of wood or other suitable material which encloses the portion 4 of the frame and provides a convenient hand hold to grasp in the hand.
  • This handle grip may be made of wood or any other material and is shown as having a groove 10 in which; the portion 4 of the-frame is received.
  • This portion 4 may be retained the groove in any suitable way-and as one simple and inexpensive buteffective way I have-,,i1lu s trated a plurality of staples 11 whichare. driven into the handle in such a position that theglegs of the stapl s will cross the groove 10 front of the portion 4. Any other way of locking the handle portion 4 in the handle grip might be employed, however, without departing from the invention.
  • the end of the saw'blade 8 is detachably secured to the end of the blade-carrying arm 3 by a simple means which is constructed so that the attachment and removal of the blade can be very easily and quickly accomplished.
  • a lever arm 13 Pivoted at 12 to the end of the blade-carrying arm 3 is a lever arm 13 which is provided with a laterally-extending pin 14 to which the saw blade 8 is secured, said pin being of a size to be inserted through the usual aperture with which the hack saw blades are provided.
  • the lever arm 13 is adapted to be swung from its operative position in which it is folded against the arm 3 to its open position shown in dotted lines Fig. 1.
  • the member 13 When the saw blade is to be installed in the frame the member 13 will be swung into its open position and one end of the saw blade 8 will be attached to the arm 6 of the handle portion by inserting the pin 7 through the aperture in the end of the saw blade and the other end of the saw blade will be attached to the swinging member 13 by inserting the pin 14 through the aperture in said other end.
  • the lever arm 13 is then swung from its open dotted line position into its closed operative position shown in full lines.
  • the arm 13 is preferably U shape in cross section and when it is in operative position the U shape of said lever arm embraces the arm 3.
  • the pin 14 extends across the channel of the lever arm 13 and the lower end of the frame arm 3 is cut away as shown at 15 to accommodate said pin 14 when the lever arm 13 is in its operative position.
  • the pin 14 swings about the pivot 12 as a center and because the saw blade 8 is attached to the two pins 7 and 14 the movement of the pin 14 in its arcuate path will cause the arm 3 and the handle portion to be drawn together slightly thereby flexing the saw frame.
  • the yielding or flexing movement of the saw frame may take place in either the arm 3 or in the handle portion 4 or in both parts of the saw frame.
  • the swinging movement of the arm 13 from its open to its closed position carries the pin 14 from one side to the other of the center line of the pivot 12 and the pin 7. As soon as the pin 14 passes this center line then the resiliency of the frame tends to complete the swinging movement of the member 13 and to fold it against the arm 3.
  • the relation between the length of the saw blade 8 and the normal distance between the arms 3 and 6 is such that when the saw blade is installed in the frame and the lever arm 13 is in its operative position the frame will still be slightly flexed thereby applying a tension on the saw blade which will hold it taut. This tension locks the lever arm 13 in its operative position so that said arm will not be accidentally swung into its open position when the saw is being used.
  • the installing of the blade in the arm involves simply swinging the lever arm 13 into its open position, applying the saw blade to the pins 7 and 14 and then swinging the lever arm 13 back into its operative position.
  • the handle portion 4 is longer than the bladesupporting arm 3 so that if the line occupied by the saw blade were extended it would cut the handle grip at its intermediate portion. This is an advantage because the power or force employed in manually operating the saw is applied to the handle grip substantially in the line of the saw blade. This makes a frame in which the power is most efiectively applied.
  • a hack saw comprising a frame presenting a back portion, a blade-carrying arm extending laterally from the back portion at one end thereof, a handle portion of greater length than said arm extending laterally from the back portion at the other end thereof, the end of the handle portion being bent into a U shape, a saw blade having one end attached directly to the U end of the handle portion and the other end attached to the blade-carrying arm, a handle grip of wood having a slot in which the laterally-extending part of the handle portion is received, said slot having a greater depth than the width of said handle portion, and fastening devices driven into the handle grip on the inside of the handle portion, said fastening devices extending across the slot and locking the handle grip to the handle portion.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sawing (AREA)

Description

March 26, 1935. F. H. KELLEY HACK SAW FRAME' Filed May 29, 1954 I \nv e nTbr. Y
ATTys.
Frederick H. Ke\ \e byMMkf Patented Mar. 26, 1935 UNITED STATES PATENT orncs l Application May. 29,1934. Serial No. 728,033
1 Claim.
This invention relates to hack saw frames and and has for its object to provide a novel hack saw frame which is inexpensive to manufacture, which is constructed so that the saw blade can 5. bequickly and easily installed in the frame or removed therefrom and which is further so constructed as to hold the saw blade under the proper amount of tension.
In order to give an understanding of the invention I have illustrated in the drawing a selected embodiment thereof which will now be described after which the novel features will be pointed out in the appended claim.
Fig. 1 is a side view of a hack saw frame embodying the invention;
Fig. 2 is a fragmentary view showing a portion of the blade-carrying arm and the blade-locking member;
Fig. 3 is a section on the line 3--3, Fig. 1 with parts broken out;
Fig. 4 is a section on the line 44, Fig. 1;
Fig. 5 is a section on the line 5--5, Fig. 1.
My improved hack saw frame, which is indicated generally at 1, is made from a length or strip of material which is bent to form the back portion 2 of the frame, a blade-carrying arm 3 extending laterally from one end of the back portion, and a handle portion 4 extending laterally from the other end of the back portion. The handle portion 4 is considerably longer than the blade-carrying arm 3 and the end of said handle portion is bent into a U shape as indicated at 5 so that the arm 6 of the U is directed backwardly toward the back 2.
The extremity of the arm 6 is provided with a pin or projection 7 adapted to enter the usual aperture in one end of the saw blade 8. The other end of the saw blade 8 is attached to the end of the blade-carrying arm 3 in such a way that when the blade is installed in the frame the frame will be flexed slightly and the arm 3 and handle portion 4 will be drawn together slightly from their normal position. The frame 2 has some resiliency and because of the flexed condition of the frame the resiliency thereof serves to hold the blade 8 taut and under the proper degree of tension.
The handle portion 4 is provided with a han dle grip 9 of wood or other suitable material which encloses the portion 4 of the frame and provides a convenient hand hold to grasp in the hand. This handle grip may be made of wood or any other material and is shown as having a groove 10 in which; the portion 4 of the-frame is received. This portion 4 may be retained the groove in any suitable way-and as one simple and inexpensive buteffective way I have-,,i1lu s trated a plurality of staples 11 whichare. driven into the handle in such a position that theglegs of the stapl s will cross the groove 10 front of the portion 4. Any other way of locking the handle portion 4 in the handle grip might be employed, however, without departing from the invention.
The end of the saw'blade 8 is detachably secured to the end of the blade-carrying arm 3 by a simple means which is constructed so that the attachment and removal of the blade can be very easily and quickly accomplished.
Pivoted at 12 to the end of the blade-carrying arm 3 is a lever arm 13 which is provided with a laterally-extending pin 14 to which the saw blade 8 is secured, said pin being of a size to be inserted through the usual aperture with which the hack saw blades are provided.
The lever arm 13 is adapted to be swung from its operative position in which it is folded against the arm 3 to its open position shown in dotted lines Fig. 1. When the saw blade is to be installed in the frame the member 13 will be swung into its open position and one end of the saw blade 8 will be attached to the arm 6 of the handle portion by inserting the pin 7 through the aperture in the end of the saw blade and the other end of the saw blade will be attached to the swinging member 13 by inserting the pin 14 through the aperture in said other end. The lever arm 13 is then swung from its open dotted line position into its closed operative position shown in full lines.
The arm 13 is preferably U shape in cross section and when it is in operative position the U shape of said lever arm embraces the arm 3.
The pin 14 extends across the channel of the lever arm 13 and the lower end of the frame arm 3 is cut away as shown at 15 to accommodate said pin 14 when the lever arm 13 is in its operative position. During the swinging movement of the member 13 from its open to its closed position the pin 14 swings about the pivot 12 as a center and because the saw blade 8 is attached to the two pins 7 and 14 the movement of the pin 14 in its arcuate path will cause the arm 3 and the handle portion to be drawn together slightly thereby flexing the saw frame. The yielding or flexing movement of the saw frame may take place in either the arm 3 or in the handle portion 4 or in both parts of the saw frame.
The swinging movement of the arm 13 from its open to its closed position carries the pin 14 from one side to the other of the center line of the pivot 12 and the pin 7. As soon as the pin 14 passes this center line then the resiliency of the frame tends to complete the swinging movement of the member 13 and to fold it against the arm 3.
The relation between the length of the saw blade 8 and the normal distance between the arms 3 and 6 is such that when the saw blade is installed in the frame and the lever arm 13 is in its operative position the frame will still be slightly flexed thereby applying a tension on the saw blade which will hold it taut. This tension locks the lever arm 13 in its operative position so that said arm will not be accidentally swung into its open position when the saw is being used.
The installing of the blade in the arm, there-' fore, involves simply swinging the lever arm 13 into its open position, applying the saw blade to the pins 7 and 14 and then swinging the lever arm 13 back into its operative position.
The handle portion 4 is longer than the bladesupporting arm 3 so that if the line occupied by the saw blade were extended it would cut the handle grip at its intermediate portion. This is an advantage because the power or force employed in manually operating the saw is applied to the handle grip substantially in the line of the saw blade. This makes a frame in which the power is most efiectively applied.
I claim:
A hack saw comprising a frame presenting a back portion, a blade-carrying arm extending laterally from the back portion at one end thereof, a handle portion of greater length than said arm extending laterally from the back portion at the other end thereof, the end of the handle portion being bent into a U shape, a saw blade having one end attached directly to the U end of the handle portion and the other end attached to the blade-carrying arm, a handle grip of wood having a slot in which the laterally-extending part of the handle portion is received, said slot having a greater depth than the width of said handle portion, and fastening devices driven into the handle grip on the inside of the handle portion, said fastening devices extending across the slot and locking the handle grip to the handle portion.
FREDERICK H. KELLEY.
US728093A 1934-05-29 1934-05-29 Hack saw frame Expired - Lifetime US1995679A (en)

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Application Number Priority Date Filing Date Title
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3821974A (en) * 1973-07-16 1974-07-02 Stanley Works Hacksaw with novel blade mounting means
US5920994A (en) * 1994-08-10 1999-07-13 Wolf-Gerate Gmbh Vertriebsgellschaft Kg Bow saw
US20100132203A1 (en) * 2008-11-28 2010-06-03 Matthew Green Hacksaw with Blade Tensioning Mechanism

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3821974A (en) * 1973-07-16 1974-07-02 Stanley Works Hacksaw with novel blade mounting means
FR2237718A1 (en) * 1973-07-16 1975-02-14 Stanley Works
US5920994A (en) * 1994-08-10 1999-07-13 Wolf-Gerate Gmbh Vertriebsgellschaft Kg Bow saw
US20100132203A1 (en) * 2008-11-28 2010-06-03 Matthew Green Hacksaw with Blade Tensioning Mechanism
US8881411B2 (en) * 2008-11-28 2014-11-11 Irwin Industrial Tool Company Hacksaw with blade tensioning mechanism
US9744604B2 (en) 2008-11-28 2017-08-29 Irwin Industrial Tool Company Hacksaw with blade tensioning mechanism

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