MXPA98003475A

MXPA98003475A - Bolt and pass extraction tool

Info

Publication number: MXPA98003475A
Application number: MXPA/A/1998/003475A
Authority: MX
Inventors: A Perin Nolan
Original assignee: A Perin Nolan
Priority date: 1995-10-31
Filing date: 1998-04-30
Publication date: 2000-05-01

Abstract

The invention provides a pin removal tool or other attachment device suitable for use in very narrow spaces that includes: (a) a joining member (20) having a central axis for attachment to an inertial impact tool; b) a hollow holding tube (30) having a central axis that is orthogonal to the central axis of the joining member; (c) a first slot (31) in the holding tube of sufficient diameter to allow the insertion of the head of the bolt or attachment device, and (d) a second groove (32) connected to the first groove having suitable dimensions to allow the arrow of the joining device to slide the first groove to the second groove, wherein the diameter of the second slot is selected to hold the head of the joining device. The pin or connecting device can be fastened with an angular offset between the connecting device and the central axis of the connecting means.

Description

PIN AND PIN-PULL EXTRACTION TOOL * This invention relates to a tool for extracting (a) bolts or (b) devices, comparable such as, pins for Hold two or more things together. The extraction tool of the invention is particularly suitable for use - with a sliding hammer or a comparable inertial impact device. To rivet the bolts with which the suspension arms of the frame of a car are mounted, the nut attached to the bolt 10J must be loosened first or cut. After this stage, Ladaxea is more difficult to extract the bolt that can be fixed in place by h &rrurnbie and the different forces acting on the suspension arm. Methods for removing the bolt include hammering the threaded-end of the bolt until it is flush with the arm of the bolt. suspension, and then driving the bolt through the suspension arm using a tapered pin. This method usuimente %. fails when the bolt has been partially extracted and flexed lejas gives its original orientation due to compressed na forces acting on the bolt. Another method has been to hold the head of the bolt with a pair of clamps and push the bolt outwards hammering on the clamps. This method is uncomfortable and economically irrational, since it creates the greatest risk of damage to a pair of pliers that have greater value than the bolt being extracted. Those methods are often destructive to the bolt and equipment that surrounds the bolt and, the resulting destruction can be accomplished by adding the extraction process anally. Sliding hammers with various attachments have been used to extract bolts. Examples of such accessories can be found in U.S. Patent Nos. 4,034,594 (Margan-, see illustrated slide-off accessor- in Fig. 5); 3, 106.012 (Eat, see slide hammer attachment of Figs.1 CL-13); 5,163 ^ 519 (Mead eL al .., - see sliding hammer attachment of Figs 3 and 9) and 1, 873.294 (Cosgrove, see hammer attachment - deslizabie de la-Fig, 2-). Without ambarao-, none of these tools are suitable for extracting a bolt with which the suspension arm of an autam_? VLL is mounted. The lack of adaptation is due to the fact that in the very narrow spaces in which it must approach such bolts , from. Suspension arm assembly with often do not give enough space to maneuver those tools, the. which must be slid over the head of the bolt with the extraction tool parallel with the bolt and in a straight angle to the head, of the bolt. Also, due to the geometry of these devices, the sliding hammer must be oriented to loa along the axis of the bolt and, this orientation is often not possible due to the very narrow spaces in which the bolt is located. With the present invention, the extraction tool can approach the bolt at an angle, such as 45 ° relative to the axis. of the leg, allowing the engagement to begin, even when the pin is located in a locked location. Also, the tool of the invention allows the sliding hammer, or other inertial impact device, to be operated on an angle-offset of the bolt-shaft. By the present invention, the extraction tools have been used at an angle offset from the vertical axis by about 45 °. Further phase shifts are possible using the tools according to the invention.

BRIEF DESCRIPTION OF THE INVENTION The invention provides a tool for extracting a bolt-or-other d-S-pxtsitive bonding of suitable dimensions, to extract a bolt or attachment device having a given bolt-bolt diameter and a head diameter of bolt or device of joining union, the tool comprising: (a) joining means for joining an inertial impact tool, the joining means having a central axis; (b) a hollow clamping tube having a central axis parallel to coextensive with an axis that is orthogonal to the central axis of the joining means; (c) a first slot in the clamping tube of sufficient diameter to allow the insertion of the bolt head or attachment device; and (d) a second slot connected to the first groove of suitable dimension to allow the arrow or joining device to slide from the first groove to the second groove, in dande the diameter of the second groove is selected to hold the head of the bolt or locking device, and wherein the bolt or attachment device can be clamped with an angular offset between the bolt or bolt device. and the axis. ae-nlraL e. the means of union. In a. Preferred embodiment, the bolt or attachment device can be fastened with an angular desiating between the bolt or attachment device and the central axis of the attachment means of between about 0 ° and about 45 °. The. invention also provides a method of extracting a bolt or joint device with an inertial impact device! comprising * attaching the extraction tool of the invention to the bolt or attachment device so that the head of the bolt or attachment device is held by the fastening groove; and operate an inertial impact device attached to the Extraction tool - to apply external force to the bolt or attachment device. Preferably, the angular offset of the bolt and the tool is. of at least 20 °, more preferably 30 °, still more preferably 45 °.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 shows a perspective view of an extraction tool according to the invention.

Figure 2 shows a side view of the extraction tool of Figure 1, showing the tapered hole 21 into which a sliding hammer can be screwed. The Figures 3A and 3B. show a section along the axis G-H shown in Figure 2. Figure 4 shows a sliding hammer of the prior art to which the extraction tool of the invention can be attached.

BeS £ R P- € iON-PETALLADA - In the description of the invention, reference is made to "fastening" a bolt head. In the context of this application, a pin is. The internal face of the bolt head is flush with the internal surface of the bolt holding groove 32 (a, in the case of a curved inner surface, as level as possible) and the Bolt head has a diameter greater than the width of. the bolt securing groove 32 ,. Additionally, the terms "bolt", "bolt head diameter" and the like should be understood as referring to comparable bolts, pins or other joining or biasing devices. In FIG. 1, the connecting means 20 of the extraction tool 10 are connected to the holding tube 30. The anion means have a central axis C-D. This axis C-D must be considered as the axis of the extraction tool 10. The holding tube -30- has a central axis E-F. The illustrated C-D axis is at a right angle to the axis E-F. The clamping tube 30 has an input groove 31 which is contiguous with a bolt-retaining groove 32. As illustrated, the clamping tube 3o has a first side wall 33A and a second wall, side 33EL The first wall laye_ral_ 33A and second side wall 33B are useful for adding strength to the tool. The first side wall 33A and the second one. 33B side wall need not be of solid construction; the alternative geometries that. also-, give resistance of handle, effective to the tool can be used in a useful way. Positions A and B - illustrate possible positions in slot 32 where the bolt head can be held. The_ figure 2_ is. an end view of the extraction tool showing the joining means 20 and the tapered hole 21- within which the threaded end of a sliding hammer can be inserted (not shown). In. Figures 3A and 3B. cuts are shown at the length of the G-H axis shown in Figure 2. The wall of the holding tube 34 is that portion of the holding tuba 30 that is not adjacent to the fastening groove of the pin 32. The wall of the tube of fastening 35 is. that portion of the clamping tube 30 which is adjacent to the bolt holding groove 32. The tapered orifice 21 contains threads 22. In Figure 3A, the first peg 70A is shown held in position A. In Figure 3B, the second bolt 70B shown fastened in position B, angular shift? of the first bolt 70A and the extraction tool is 0o. The # angular shift? of the second bolt 70B and the extraction tool 10 is 30 °. In Figure 4, the sliding hammer of the prior art 40 has a handle 41, an arrow 42, a first detent device 43A, a second detent device 43B, a threaded end 44 for attachment to an appropriate tool and a weight of inertial impact - 45 that has a handle 46. In conjunction with. The present invention, the sliding hammer is operated by (a) holding a bolt head coru The extraction tool of the invention, (b) attaching the sliding hammer to the tool (if it is not already attached), (c) moving the inertial impact weight 45- to a position adjacent to the second detent 43B, and (d) accelerating the inelastic impact weight 45- towards the first detent 43A-. When the weight 45 Latch the first detent, the force of the impact is transferred to the bolt fastened . by a combined extraction tool 10. In a preferred embodiment, the extraction tool * it can-hold a bolt in an offset from the bolt axis as much as about 30 °, even more preferably both camo about 45 °. It will be recognized that the input slot illustrated 31 is substantially larger than necessary to serve its function of allowing easy insertion of a bolt head into the clamping tube; Smaller sizes can be used favorably. Such smaller sizes can facilitate the construction of extraction tools that allow large angular shifts.

The holding tube 30 is substantially cylindrical in shape. The phrase "substantially cylindrical" means that the shape of the tube is rounded adjacent to the bolt fastening groove 32, as illustrated, allowing a widening angle between a clamped bolt 5 and the extraction tool 10. In some embodiments, the clamping tube 30- is- completely cylindrical, meaning that all the external surfaces of the clamping tube 30 are cylindrical except the areas that. are cut out to form the slot # inlet 21 and retaining slot 32. 10- In an ar-efferid mode ^ the sides of the clamping slot 32 at the junction with the entry slot 31 are wedge-shaped, with the wedge fatigued by cutting the internal surface of the clamping cylinder. Of course, the phrase "cut" is intended to describe the geometry of the wedge ^ in fact, it can be formed directly by "a casting process" The wedge facilitates the adjustment of the extraction tool on the bolt head of a bolt to be extracted.The wedge is generally formed in such a way that the side walls forming the groove clamping 32 thicken as the distance from the groove increases Input 2D_ Preferably, the wedge-shaped portion of the side walls extends no more than approximately from the entry slot 31. The extraction tool can be manufactured from common tooling devices. For example, the connecting means 2.1 are manufactured by welding two hardened nuts sized equivalently. To ensure that the nuts are screwed in, the nuts should be sealed together while temporarily bolted onto the same bolt. However, it is generally useful to re-abuse the coils to ensure uniform alignment. The joining means 20 are welded to a piece of the pipe, - for example a piece of pipe 3.81 c. in diameter, which will form the clamping tube 30. The entry slot 31 can be cut-off from the pipe-using a flame-blow torch or a saw. To harden the tool, 3.81 washers are welded 1Q_cm (external diameter) a. the ends of the pipe to form the first and second side walls 33A and 33B, respectively. Finally, the holding groove 32 is cut into the pipe using a perforation towards the radius (ie, round) bottom of the slot and a saw, to cut the sides of the slot. Preferably, the extraction tool 10 is formed using a casting technique. To facilitate casting, it may be necessary to cast the tool without one or both of the first and second side walls 32A and 32.B, respectively, which may be separately joined to the tool 10. Other - Procedures for casting the tool in parts to accommodate geometric constraints will be recognized by those with experience in the. tool making technique. The extraction tool 10 can be formed of any material that results in a tool of sufficient strength for use in a particular field. Preferably, the extraction tool is metal, more preferably formed of a steel alloy or metal alloy of comparable strength. In a particularly preferred embodiment, the extraction tool 10 s is made of steel. chorno.- mal ib den o (an alloy of steel that typically contains, by weight, between approximately 0.28% and preferably 0.33% carbon, between approximately -40% -40% and approximately 0.60% carbon. manganese, between about 0-20% - and approximatively Q.35.% silicon, between about 0.80% and about 0.1 1% chromium, between about - 0, 15% - and - approximately (1.25% molybdenum, more than about 0.035% phosphorus and not more than about 0_4% de-sulfur), such as, cethamo-molybdenum steel 41 / 3O-. The thickness of the walls of the clamping tube 30 is selected after taking into account the adequate strength of a particular application and the advantage derived from having a thin thickness of the walls surrounding the groove, holding bolt 32r whose thickness * facilitates the adjustment of the tool on the head of the bolt. Preferably, the face of the removal tool 10 in the bolt holding groove 32 is flush with the outer face of . The holding slot 3Z, to facilitate the adjustment of the tool on the head of the bolt. In the United States, demolition hammers typically have 1 .58 cm and 1 .27 cm arrows. Therefore, for use in the United States, the extraction tool will be designed from favorable way to adjust one or the other of those dimensionally slidable hammers. Other sizes will generally be used for extraction tools manufactured for foreign markets. An extraction tool having a bolt-securing groove 32 of 1, 5-8 cm wide is suitable for removing bolts of 1.1 1, 0.95, 1.27, 1.42 and 1.58 cm. An extraction tool that has a Lanzón_of clamping 32 of 2.22_cm wide is suitable for extracting bolts of 1.58, 1.90 and 7.22 cm. It will be recognized that, while the locking or working conditions involved in the removal of automobile suspension bolts Q give rise to, the present invention, the tool of the invention is conveniently applied in many contexts. The extraction tool of the invention is further adjusted. easily even when there are no substantial space restrictions.

Claims

CLAIMS * 1.
A tool to extract a bolt or other joining device, The tool. what's up Adequate dimensions of the leg 5 a bolt or fastening device having a bolt-bolt diameter or a given connecting device and a diameter-of bolt head or attachment device, the tool comprising: (a), connecting means for joining a tool from. inertial impact, the joining means that have a central axis; 10- (b-> a hollow clamping tube, which has a central axis- pales it or coextensive with an axis that is orthogonal to the central axis of the m_exüas-da union; (o), a first groove, in i holding tube of sufficient diameter to allow insertion of the head of the bolt or attachment device, and (d) a second slot connected to the first slot # adequate dimension to allow the arrow or joining device to be. slide from the first groove to the second groove, where the diameter of the second groove is selected to hold the head of the bolt or connecting device, and in dande the bolt or attachment device can be fastened with an angular offset between the bolt or connecting device and the central axis of the joining means. ~ Z The extraction tool of claim 1, wherein the bolt or attachment device can be clamped with an angular offset between the bolt or attachment device and the central axis of the attachment means of between about 0 ° and about 30 °. .
3. - The extraction tool of claim 1, wherein the bolt or attachment device can be fastened with an angular deflection between the bolt or attachment device and the central axis of the joining means of between approximately 0 ° and approximately mind-45 °.
4-, The extraction tool of claim 1, wherein the first and second slots are of appropriate size for the removal of a bolt or attachment device having an arrow with a diameter of about 0.95 cm or more and about 1.58. cm or less.
5. The extraction tool of claim 1, wherein the first and second slots are of appropriate size for the removal of a bolt or attachment device having an arrow with a diameter of approximately 1.58 cm or more and approximately 2.22. cm or less.
The extraction tool of claim 1, wherein the attachment means and the holding tube are fabricated together using a setting process.
7. The extraction tool _d_e claim 1, wherein the clamping tube is substantially cylindrical ..
8. The extraction tool of claim 1, wherein the clamping tube is cylindrical.
9. The extraction tool of claim 1, in * where The sides of. the second slot in the junction with the.
First slot are wedge shaped. 1 Q.
A method for extracting a bolt or connection device with an inertial impact device comprising joining the extraction tool of claim 1 to the bolt or attachment device so that the head of the bolt or attachment device is. held by the retaining slot; and * operating an inertial impact device attached to the extraction tool 10. to apply external force on the bolt or attachment device 11.
The method of claim 10, wherein the angular offset of the bolt and the tool is of at least 2O ° C. 15. 12_ The method of. the. claim 10, wherein the angular offset of the bolt and the tool is at least # 3a ° C.
13. The method of claim 10, wherein the angular offset of the bolt and the tool is at least 2 45 ° C. SUMMARY The invention provides a bolt removal tool or ot-union device suitable for use in very narrow spaces that includes: (a) a union member (20) having a central axis for attachment to one. LnerciaL impact tool; (b) a hollow clamping tube (30) having a central axis that is orthogonal to the central axis of the joining member; (c) a first slot * (31) in the clamping tube of sufficient diameter to allow the 10- Insertion of the head- of the bolt or attachment device; and (d) a second slot (32) connected to the first slot having suitable dimensions, to allow the arrow of the joining device to slide from the first slot to the second slot, wherein the diameter of. The second-slot is selected- for, hold 15 the head of the joint device. The bolt or attachment device can be fastened with an angular phase shift between the device * of union and the central axis of the joining means.